14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CDDL HEADER START
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The contents of this file are subject to the terms of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Common Development and Distribution License (the "License").
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * You may not use this file except in compliance with the License.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See the License for the specific language governing permissions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and limitations under the License.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * When distributing Covered Code, include this CDDL HEADER in each
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If applicable, add the following below this CDDL HEADER, with the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * fields enclosed by brackets "[]" replaced with your own identifying
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * information: Portions Copyright [yyyy] [name of copyright owner]
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CDDL HEADER END
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace - Dynamic Tracing for Solaris
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the implementation of the Solaris Dynamic Tracing framework
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (DTrace). The user-visible interface to DTrace is described at length in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the "Solaris Dynamic Tracing Guide". The interfaces between the libdtrace
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * library, the in-kernel DTrace framework, and the DTrace providers are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * described in the block comments in the <sys/dtrace.h> header file. The
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * internal architecture of DTrace is described in the block comments in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * <sys/dtrace_impl.h> header file. The comments contained within the DTrace
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * implementation very much assume mastery of all of these sources; if one has
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * an unanswered question about the implementation, one should consult them
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The functions here are ordered roughly as follows:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Probe context functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Probe hashing functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Non-probe context utility functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Matching functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Provider-to-Framework API functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Probe management functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - DIF object functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Format functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Predicate functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - ECB functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Buffer functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Enabling functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - DOF functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Anonymous enabling functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Consumer state functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Helper functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Hook functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - Driver cookbook functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Each group of functions begins with a block comment labelled the "DTrace
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * [Group] Functions", allowing one to find each block by searching forward
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * on capital-f functions.
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync#else /* VBOX */
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync * Use asm.h to implemente some of the simple stuff in dtrace_asm.s.
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync# define dtrace_casptr(a_ppvDst, a_pvOld, a_pvNew) \
e3c0207b236896a903ef328bfa74ee97e61bd38bvboxsync VBoxDtCompareAndSwapPtr((void * volatile *)a_ppvDst, a_pvOld, a_pvNew)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsyncDECLINLINE(void *) VBoxDtCompareAndSwapPtr(void * volatile *ppvDst, void *pvOld, void *pvNew)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync ASMAtomicCmpXchgExPtrVoid(ppvDst, pvNew, pvOld, &pvRet);
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync# define dtrace_cas32(a_pu32Dst, a_pu32Old, a_pu32New) \
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync VBoxDtCompareAndSwapU32(a_pu32Dst, a_pu32Old, a_pu32New)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsyncDECLINLINE(uint32_t) VBoxDtCompareAndSwapU32(uint32_t volatile *pu32Dst, uint32_t u32Old, uint32_t u32New)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync ASMAtomicCmpXchgExU32(pu32Dst, u32New, u32Old, &u32Ret);
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync#define dtrace_interrupt_disable() ASMIntDisableFlags()
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync#define dtrace_interrupt_enable(a_EFL) ASMSetFlags(a_EFL)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync * NULL must be set to 0 or we'll end up with a billion warnings(=errors).
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync#endif /* VBOX */
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync/** Check if the given address is a valid kernel address.
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync * The value can be uintptr_t or uint64_t. */
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync# define VBDT_IS_VALID_KRNL_ADDR(a_uAddr) ((a_uAddr) >= KERNELBASE)
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync ( (sizeof(a_uAddr) == sizeof(uintptr_t) || (uintptr_t)(a_uAddr) == (a_uAddr)) \
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync && RTR0MemKernelIsValidAddr((void *)(uintptr_t)(a_uAddr)) )
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Tunable Variables
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The following variables may be tuned by adding a line to /etc/system that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * includes both the name of the DTrace module ("dtrace") and the name of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * variable. For example:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * set dtrace:dtrace_destructive_disallow = 1
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * In general, the only variables that one should be tuning this way are those
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that affect system-wide DTrace behavior, and for which the default behavior
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is undesirable. Most of these variables are tunable on a per-consumer
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * basis using DTrace options, and need not be tuned on a system-wide basis.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * When tuning these variables, avoid pathological values; while some attempt
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is made to verify the integrity of these variables, they are not considered
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * part of the supported interface to DTrace, and they are therefore not
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * checked comprehensively. Further, these variables should not be tuned
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dynamically via "mdb -kw" or other means; they should only be tuned via
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_nonroot_maxsize = (16 * 1024 * 1024);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_dstate_defsize = (1 * 1024 * 1024);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_cleanrate_default = 9900990; /* 101 hz */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_cleanrate_min = 200000; /* 5000 hz */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_cleanrate_max = (uint64_t)60 * NANOSEC; /* 1/minute */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_aggrate_default = NANOSEC; /* 1 hz */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_statusrate_default = NANOSEC; /* 1 hz */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_statusrate_max = (hrtime_t)10 * NANOSEC; /* 6/minute */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_switchrate_default = NANOSEC; /* 1 hz */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_optval_t dtrace_specsize_default = 32 * 1024;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsynchrtime_t dtrace_chill_max = 500 * (NANOSEC / MILLISEC); /* 500 ms */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsynchrtime_t dtrace_chill_interval = NANOSEC; /* 1000 ms */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsynchrtime_t dtrace_deadman_timeout = (hrtime_t)10 * NANOSEC;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsynchrtime_t dtrace_deadman_user = (hrtime_t)30 * NANOSEC;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace External Variables
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * As dtrace(7D) is a kernel module, any DTrace variables are obviously
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * available to DTrace consumers via the backtick (`) syntax. One of these,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_zero, is made deliberately so: it is provided as a source of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * well-known, zero-filled memory. While this variable is not documented,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it is used by some translators as an implementation detail.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncconst char dtrace_zero[256] = { 0 }; /* zero-filled memory */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Internal Variables
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncstatic vmem_t *dtrace_minor; /* minor number arena */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_probe_t **dtrace_probes; /* array of all probes */
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsyncstatic VBDTTYPE(uint32_t,int) dtrace_nprobes; /* number of probes */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_provider_t *dtrace_provider; /* provider list */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_meta_t *dtrace_meta_pid; /* user-land meta provider */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic void *dtrace_softstate; /* softstate pointer */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_hash_t *dtrace_bymod; /* probes hashed by module */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_hash_t *dtrace_byfunc; /* probes hashed by function */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_hash_t *dtrace_byname; /* probes hashed by name */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_toxrange_t *dtrace_toxrange; /* toxic range array */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_toxranges; /* number of toxic ranges */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_toxranges_max; /* size of toxic range array */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_anon_t dtrace_anon; /* anonymous enabling */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic kmem_cache_t *dtrace_state_cache; /* cache for dynamic state */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic uint64_t dtrace_vtime_references; /* number of vtimestamp refs */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic kthread_t *dtrace_panicked; /* panicking thread */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_ecb_t *dtrace_ecb_create_cache; /* cached created ECB */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_genid_t dtrace_probegen; /* current probe generation */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_helpers_t *dtrace_deferred_pid; /* deferred helper list */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_enabling_t *dtrace_retained; /* list of retained enablings */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_genid_t dtrace_retained_gen; /* current retained enab gen */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_dynvar_t dtrace_dynhash_sink; /* end of dynamic hash chains */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_dynvar_failclean; /* dynvars failed to clean */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Locking
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace is protected by three (relatively coarse-grained) locks:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (1) dtrace_lock is required to manipulate essentially any DTrace state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * including enabling state, probes, ECBs, consumer state, helper state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * etc. Importantly, dtrace_lock is _not_ required when in probe context;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probe context is lock-free -- synchronization is handled via the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_sync() cross call mechanism.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (2) dtrace_provider_lock is required when manipulating provider state, or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * when provider state must be held constant.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (3) dtrace_meta_lock is required when manipulating meta provider state, or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * when meta provider state must be held constant.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The lock ordering between these three locks is dtrace_meta_lock before
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_provider_lock before dtrace_lock. (In particular, there are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * several places where dtrace_provider_lock is held by the framework as it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * calls into the providers -- which then call back into the framework,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * grabbing dtrace_lock.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There are two other locks in the mix: mod_lock and cpu_lock. With respect
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to dtrace_provider_lock and dtrace_lock, cpu_lock continues its historical
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * role as a coarse-grained lock; it is acquired before both of these locks.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * With respect to dtrace_meta_lock, its behavior is stranger: cpu_lock must
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be acquired _between_ dtrace_meta_lock and any other DTrace locks.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * mod_lock is similar with respect to dtrace_provider_lock in that it must be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * acquired _between_ dtrace_provider_lock and dtrace_lock.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic kmutex_t dtrace_provider_lock; /* provider state lock */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic kmutex_t dtrace_meta_lock; /* meta-provider state lock */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Provider Variables
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These are the variables relating to DTrace as a provider (that is, the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * provider of the BEGIN, END, and ERROR probes).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, const dtrace_probedesc_t *))dtrace_nullop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (int (*)(void *, dtrace_id_t, void *))dtrace_enable_nullop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_id_t dtrace_probeid_begin; /* special BEGIN probe */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_id_t dtrace_probeid_end; /* special END probe */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_id_t dtrace_probeid_error; /* special ERROR probe */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Helper Tracing Variables
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Error Hashing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * On DEBUG kernels, DTrace will track the errors that has seen in a hash
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * table. This is very useful for checking coverage of tests that are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * expected to induce DIF or DOF processing errors, and may be useful for
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * debugging problems in the DIF code generator or in DOF generation . The
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * error hash may be examined with the ::dtrace_errhash MDB dcmd.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_errhash_t dtrace_errhash[DTRACE_ERRHASHSZ];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Macros and Constants
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These are various macros that are useful in various spots in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * implementation, along with a few random constants that have no meaning
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * outside of the implementation. There is no real structure to this cpp
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * mishmash -- but is there ever?
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_hash_str(*((char **)((uintptr_t)(probe) + (hash)->dth_stroffs)))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (dtrace_probe_t **)((uintptr_t)(probe) + (hash)->dth_nextoffs)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (dtrace_probe_t **)((uintptr_t)(probe) + (hash)->dth_prevoffs)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (strcmp(*((char **)((uintptr_t)(lhs) + (hash)->dth_stroffs)), \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((char **)((uintptr_t)(rhs) + (hash)->dth_stroffs))) == 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DTRACE_V4MAPPED_OFFSET (sizeof (uint32_t) * 3)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The key for a thread-local variable consists of the lower 61 bits of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * t_did, plus the 3 bits of the highest active interrupt above LOCK_LEVEL.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We add DIF_VARIABLE_MAX to t_did to assure that the thread key is never
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * equal to a variable identifier. This is necessary (but not sufficient) to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * assure that global associative arrays never collide with thread-local
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * variables. To guarantee that they cannot collide, we must also define the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * order for keying dynamic variables. That order is:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * [ key0 ] ... [ keyn ] [ variable-key ] [ tls-key ]
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Because the variable-key and the tls-key are in orthogonal spaces, there is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * no way for a global variable key signature to match a thread-local key
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * signature.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint_t actv = CPU->cpu_intr_actv >> (LOCK_LEVEL + 1); \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (where) = ((curthread->t_did + DIF_VARIABLE_MAX) & \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (((uint64_t)1 << 61) - 1)) | ((uint64_t)intr << 61); \
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync (where) = (((uintptr_t)RTThreadNativeSelf() + DIF_VARIABLE_MAX) & (RT_BIT_64(61) - 1)) \
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync | (RTThreadIsInInterrupt(NIL_RTTHREAD) ? RT_BIT_64(61) : 0); \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DT_BSWAP_16(x) ((DT_BSWAP_8(x) << 8) | DT_BSWAP_8((x) >> 8))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DT_BSWAP_32(x) ((DT_BSWAP_16(x) << 16) | DT_BSWAP_16((x) >> 16))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DT_BSWAP_64(x) ((DT_BSWAP_32(x) << 32) | DT_BSWAP_32((x) >> 32))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((type *)((uintptr_t)(tomax) + (uintptr_t)offset)) = (type)(what);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = addr; \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0); \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Test whether a range of memory starting at testaddr of size testsz falls
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * within the range of memory described by addr, sz. We take care to avoid
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * problems with overflow and underflow of the unsigned quantities, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * disallow all negative sizes. Ranges of size 0 are allowed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DTRACE_INRANGE(testaddr, testsz, baseaddr, basesz) \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (testaddr) + (testsz) - (baseaddr) <= (basesz) && \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Test whether alloc_sz bytes will fit in the scratch region. We isolate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * alloc_sz on the righthand side of the comparison in order to avoid overflow
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or underflow in the comparison with it. This is simpler than the INRANGE
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * check above, because we know that the dtms_scratch_ptr is valid in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * range. Allocations of size zero are allowed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((mstate)->dtms_scratch_base + (mstate)->dtms_scratch_size - \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*CSTYLED*/ \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*CSTYLED*/ \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_toxranges; i++) { \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync continue; \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync continue; \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This address falls within a toxic region; return 0. \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0); \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*CSTYLED*/ \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (!(*flags & CPU_DTRACE_FAULT) ? rval : 0); \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync#else /* VBOX */
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync /*DTRACE_ALIGNCHECK(addr, size, flags);*/ \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync for (i = 0; i < dtrace_toxranges; i++) { \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync continue; \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync continue; \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync * This address falls within a toxic region; return 0. \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync cpu_core[me].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync return (0); \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync rc = RTR0MemKernelCopyFrom(&rval, (void const *)addr, size); \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync * If not supported, pray it won't fault... \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync cpu_core[me].cpuc_dtrace_flags |= CPU_DTRACE_BADADDR; \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync return (0); \
36e8ca5ab8d79c1dc03693ea22b5706f2adcce98vboxsync#endif /* VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync#define DTRACE_ANCHORED(probe) ((probe)->dtpr_func[0] != '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (((flags) & CPU_DTRACE_BADADDR) ? DTRACEFLT_BADADDR : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((flags) & CPU_DTRACE_DIVZERO) ? DTRACEFLT_DIVZERO : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((flags) & CPU_DTRACE_TUPOFLOW) ? DTRACEFLT_TUPOFLOW : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((flags) & CPU_DTRACE_BADALIGN) ? DTRACEFLT_BADALIGN : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((flags) & CPU_DTRACE_NOSCRATCH) ? DTRACEFLT_NOSCRATCH : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((flags) & CPU_DTRACE_BADSTACK) ? DTRACEFLT_BADSTACK : \
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (act)->dta_difo->dtdo_rtype.dtdt_kind == DIF_TYPE_STRING)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_probe_t *dtrace_probe_lookup_id(dtrace_id_t id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic void dtrace_enabling_provide(dtrace_provider_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_enabling_match(dtrace_enabling_t *, int *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic void dtrace_enabling_matchall(void);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic uint64_t dtrace_helper(int, dtrace_mstate_t *,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic dtrace_helpers_t *dtrace_helpers_create(proc_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic intptr_t dtrace_buffer_reserve(dtrace_buffer_t *, size_t, size_t,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_state_option(dtrace_state_t *, dtrace_optid_t,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic int dtrace_ecb_create_enable(dtrace_probe_t *, void *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic void dtrace_helper_provider_destroy(dtrace_helper_provider_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Probe Context Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These functions are called from probe context. Because probe context is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * any context in which C may be called, arbitrarily locks may be held,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interrupts may be disabled, we may be in arbitrary dispatched state, etc.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * As a result, functions called from probe context may only call other DTrace
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * support functions -- they may not interact at all with the system at large.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (Note that the ASSERT macro is made probe-context safe by redefining it in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * terms of dtrace_assfail(), a probe-context safe function.) If arbitrary
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * loads are to be performed from probe context, they _must_ be in terms of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the safe dtrace_load*() variants.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Some functions in this block are not actually called from probe context;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for these functions, there will be a comment above the function reading
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * "Note: not called from probe context."
e4398da069c32fcf9f6814159b991706d765471bvboxsync#ifndef VBOX /* We have our own assertion machinery. */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_panic("assertion failed: %s, file: %s, line: %d", a, f, l);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We just need something here that even the most clever compiler
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cannot optimize away.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (a[(uintptr_t)f]);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Atomically increment a specified error counter from probe context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Most counters stored to in probe context are per-CPU counters.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * However, there are some error conditions that are sufficiently
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * arcane that they don't merit per-CPU storage. If these counters
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are incremented concurrently on different CPUs, scalability will be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * adversely affected -- but we don't expect them to be white-hot in a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * correctly constructed enabling...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the counter would wrap, set it to 1 -- assuring
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that the counter is never zero when we have seen
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * errors. (The counter must be 32-bits because we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aren't guaranteed a 64-bit compare&swap operation.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * To save this code both the infamy of being fingered
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * by a priggish news story and the indignity of being
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the target of a neo-puritan witch trial, we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * carefully avoiding any colorful description of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * likelihood of this condition -- but suffice it to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * say that it is only slightly more likely than the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * overflow of predicate cache IDs, as discussed in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_predicate_create().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32(counter, oval, nval) != oval);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Use the DTRACE_LOADFUNC macro to define functions for each of loading a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * uint8_t, a uint16_t, a uint32_t and a uint64_t.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_inscratch(uintptr_t dest, size_t size, dtrace_mstate_t *mstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nsvars; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_INRANGE(addr, sz, svar->dtsv_data, svar->dtsv_size))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check to see if the address is within a memory region to which a store may
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be issued. This includes the DTrace scratch areas, and any DTrace variable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * region. The caller of dtrace_canstore() is responsible for performing any
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * alignment checks that are needed before stores are actually executed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_canstore(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, check to see if the address is in scratch space...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_INRANGE(addr, sz, mstate->dtms_scratch_base,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now check to see if it's a dynamic variable. This check will pick
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * up both thread-local variables and any global dynamically-allocated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * variables.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_INRANGE(addr, sz, (uintptr_t)vstate->dtvs_dynvars.dtds_base,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (dstate->dtds_hashsize * sizeof (dtrace_dynhash_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we assume that we can store here, we need to make
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sure that it isn't in our metadata -- storing to our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dynamic variable metadata would corrupt our state. For
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the range to not include any dynamic variable metadata,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (1) Start above the hash table that is at the base of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the dynamic variable space
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (2) Have a starting chunk offset that is beyond the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_dynvar_t that is at the base of every chunk
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (3) Not span a chunk boundary
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync chunkoffs = (addr - base) % dstate->dtds_chunksize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, check the static local and global variables. These checks
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * take the longest, so we perform them last.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Convenience routine to check to see if the address is within a memory
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * region in which a load may be issued given the user's privilege level;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * if not, it sets the appropriate error flags and loads 'addr' into the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * illegal value slot.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace subroutines (DIF_SUBR_*) should use this helper to implement
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * appropriate memory access protection.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_canload(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync volatile uintptr_t *illval = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we hold the privilege to read from kernel memory, then
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * everything is readable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * You can obviously read that which you can store.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're allowed to read from our own string table.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_INRANGE(addr, sz, (uintptr_t)mstate->dtms_difo->dtdo_strtab,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Convenience routine to check to see if a given string is within a memory
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * region in which a load may be issued given the user's privilege level;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this exists so that we don't need to issue unnecessary dtrace_strlen()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * calls in the event that the user has all privileges.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_strcanload(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we hold the privilege to read from kernel memory, then
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * everything is readable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strsz = 1 + dtrace_strlen((char *)(uintptr_t)addr, sz);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Convenience routine to check to see if a given variable is within a memory
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * region in which a load may be issued given the user's privilege level.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_vcanload(void *src, dtrace_diftype_t *type, dtrace_mstate_t *mstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we hold the privilege to read from kernel memory, then
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * everything is readable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vstate->dtvs_state->dts_options[DTRACEOPT_STRSIZE]) + 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (dtrace_canload((uintptr_t)src, sz, mstate, vstate));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Compare two strings using safe loads.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync flags = (volatile uint16_t *)&cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (--limit && c1 != '\0' && !(*flags & CPU_DTRACE_FAULT));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Compute strlen(s) for a string using safe memory accesses. The additional
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * len parameter is used to specify a maximum length to ensure completion.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check if an address falls within a toxic region.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_toxranges; i++) {
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = kaddr;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = taddr;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Copy src to dst using safe memory accesses. The src is assumed to be unsafe
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * memory specified by the DIF program. The dst is assumed to be safe memory
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that we can store to directly because it is managed by DTrace. As with
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * standard bcopy, overlapping copies are handled properly.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_bcopy(const void *src, void *dst, size_t len)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (--len != 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (--len != 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Copy src to dst using safe memory accesses, up to either the specified
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * length, or the point that a nul byte is encountered. The src is assumed to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be unsafe memory specified by the DIF program. The dst is assumed to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * safe memory that we can store to directly because it is managed by DTrace.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Unlike dtrace_bcopy(), overlapping regions are not handled.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_strcpy(const void *src, void *dst, size_t len)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Copy src to dst, deriving the size and type from the specified (BYREF)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * variable type. The src is assumed to be unsafe memory specified by the DIF
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * program. The dst is assumed to be DTrace variable memory that is of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified type; we assume that we can store to directly.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_vcopy(void *src, void *dst, dtrace_diftype_t *type)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Compare s1 to s2 using safe memory accesses. The s1 data is assumed to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * unsafe memory specified by the DIF program. The s2 data is assumed to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * safe memory that we can access directly because it is managed by DTrace.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_bcmp(const void *s1, const void *s2, size_t len)
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync flags = (volatile uint16_t *)&cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (--len != 0 && !(*flags & CPU_DTRACE_FAULT));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Zero the specified region using a simple byte-by-byte loop. Note that this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is for safe DTrace-managed memory only.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_add_128(uint64_t *addend1, uint64_t *addend2, uint64_t *sum)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (result[0] < addend1[0] || result[0] < addend2[0] ? 1 : 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Shift the 128-bit value in a by b. If b is positive, shift left.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If b is negative, shift right.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (b == 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (b < 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (b >= 64) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a[0] >>= b;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a[1] >>= b;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (b >= 64) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a[1] <<= b;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a[0] <<= b;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The basic idea is to break the 2 64-bit values into 4 32-bit values,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * use native multiplication on those, and then re-combine into the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * resulting 128-bit value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (hi1 << 32 + lo1) * (hi2 << 32 + lo2) =
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hi1 * hi2 << 64 +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hi1 * lo2 << 32 +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hi2 * lo1 << 32 +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * lo1 * lo2
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_multiply_128(uint64_t factor1, uint64_t factor2, uint64_t *product)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This privilege check should be used by actions and subroutines to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * verify that the user credentials of the process that enabled the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * invoking ECB match the target credentials
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We should always have a non-NULL state cred here, since if cred
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is null (anonymous tracing), we fast-path bypass this routine.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This privilege check should be used by actions and subroutines to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * verify that the zone of the process that enabled the invoking ECB
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * matches the target credentials
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We should always have a non-NULL state cred here, since if cred
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is null (anonymous tracing), we fast-path bypass this routine.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This privilege check should be used by actions and subroutines to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * verify that the process has not setuid or changed credentials.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE) == 0) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER) == 0) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG) == 0) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_cred.dcr_action & DTRACE_CRA_PROC_CONTROL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_cred.dcr_action & DTRACE_CRA_KERNEL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_KPRIV;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_priv_kernel_destructive(dtrace_state_t *state)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_cred.dcr_action & DTRACE_CRA_KERNEL_DESTRUCTIVE)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_KPRIV;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: not called from probe context. This function is called
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * asynchronously (and at a regular interval) from outside of probe context to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * clean the dirty dynamic variable lists on all CPUs. Dynamic variable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cleaning is explained in detail in <sys/dtrace_impl.h>.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < NCPU; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the dirty list is NULL, there is no dirty work to do.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the rinsing list is non-NULL, then it is because
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this CPU was selected to accept another CPU's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dirty list -- and since that time, dirty buffers
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have accumulated. This is a highly unlikely
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * condition, but we choose to ignore the dirty
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffers -- they'll be picked up a future cleanse.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the clean list is non-NULL, then we're in a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * situation where a CPU has done deallocations (we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have a non-NULL dirty list) but no allocations (we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * also have a non-NULL clean list). We can't simply
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * move the dirty list into the clean list on this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CPU, yet we also don't want to allow this condition
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to persist, lest a short clean list prevent a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * massive dirty list from being cleaned (which in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * turn could lead to otherwise avoidable dynamic
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * drops). To deal with this, we look for some CPU
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * with a NULL clean list, NULL dirty list, and NULL
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rinsing list -- and then we borrow this CPU to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rinse our dirty list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (j = 0; j < NCPU; j++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (j == NCPU) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We were unable to find another CPU that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * could accept this dirty list -- we are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * therefore unable to clean it now.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Atomically move the dirty list aside.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we zap the dirty list, set the rinsing list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This allows for a potential assertion in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_dynvar(): if a free dynamic variable appears
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * on a hash chain, either the dirty list or the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rinsing list for some CPU must be non-NULL.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have no work to do; we can simply return.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < NCPU; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We are now guaranteed that no hash chain contains a pointer
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * into this dirty list; we can make it clean.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we actually set the state to be DTRACE_DSTATE_CLEAN, make
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sure that all CPUs have seen all of the dtdsc_clean pointers.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This prevents a race whereby a CPU incorrectly decides that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the state should be something other than DTRACE_DSTATE_CLEAN
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * after dtrace_dynvar_clean() has completed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Depending on the value of the op parameter, this function looks-up,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocates or deallocates an arbitrarily-keyed dynamic variable. If an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocation is requested, this function will return a pointer to a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_dynvar_t corresponding to the allocated variable -- or NULL if no
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * variable can be allocated. If NULL is returned, the appropriate counter
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * will be incremented.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dynvar(dtrace_dstate_t *dstate, uint_t nkeys,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_key_t *key, size_t dsize, dtrace_dynvar_op_t op,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dynvar_t *free, *new_free, *next, *dvar, *start, *prev = NULL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[me];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Hash the key. As with aggregations, we use Jenkins' "One-at-a-time"
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * algorithm. For the by-value portions, we perform the algorithm in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 16-bit chunks (as opposed to 8-bit chunks). This speeds things up a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * bit, and seems to have only a minute effect on distribution. For
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the by-reference data, we perform "One-at-a-time" iterating (safely)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * over each referenced byte. It's painful to do this, but it's much
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * better than pathological hash distribution. The efficacy of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hashing algorithm (and a comparison with other algorithms) may be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * found by running the ::dtrace_dynstat MDB dcmd.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nkeys; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is incredibly painful, but it beats the hell
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * out of the alternative.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (j = 0; j < size; j++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There is a remote chance (ideally, 1 in 2^31) that our hashval
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * comes out to be one of our two sentinel hash values. If this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * actually happens, we set the hashval to be a value known to be a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * non-sentinel value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (hashval == DTRACE_DYNHASH_FREE || hashval == DTRACE_DYNHASH_SINK)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Yes, it's painful to do a divide here. If the cycle count becomes
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * important here, tricks can be pulled to reduce it. (However, it's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * critical that hash collisions be kept to an absolute minimum;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * they're much more painful than a divide.) It's better to have a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * solution that generates few collisions and still keeps things
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * relatively simple.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync volatile uintptr_t *lockp = &hash[bucket].dtdh_lock;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(start != NULL && (start->dtdv_hashval == DTRACE_DYNHASH_SINK ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (dvar = start; dvar != NULL; dvar = dvar->dtdv_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We've reached the sink, and therefore the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * end of the hash chain; we can kick out of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the loop knowing that we have seen a valid
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * snapshot of state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We've gone off the rails: somewhere along
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the line, one of the members of this hash
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * chain was deleted. Note that we could also
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * detect this by simply letting this loop run
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to completion, as we would eventually hit
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the end of the dirty list. However, we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * want to avoid running the length of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dirty list unnecessarily (it might be quite
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * long), so we catch this as early as
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * possible by detecting the hash marker. In
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this case, we simply set dvar to NULL and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * break; the conditional after the loop will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * send us back to top.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dvar->dtdv_next->dtdv_hashval != DTRACE_DYNHASH_FREE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have failed to atomically swing the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hash table head pointer, presumably because
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of a conflicting allocation on another CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to reread the hash chain and try
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now set the hash value to indicate that it's free.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set the next pointer to point at the dirty list, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * atomically swing the dirty pointer to the newly freed dvar.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_casptr(&dcpu->dtdsc_dirty, next, dvar) != next);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, unlock this hash bucket.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If dvar is NULL, it is because we went off the rails:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * one of the elements that we traversed in the hash chain
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * was deleted while we were traversing it. In this case,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we assert that we aren't doing a dealloc (deallocs lock
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the hash bucket to prevent themselves from racing with
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * one another), and retry the hash chain traversal.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we are not to allocate a new variable, we want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * return NULL now. Before we return, check that the value
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of the lock word hasn't changed. If it has, we may have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * seen an inconsistent snapshot.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to allocate a new dynamic variable. The size we need is the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size of dtrace_dynvar plus the size of nkeys dtrace_key_t's plus the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size of any auxiliary key data (rounded up to 8-byte alignment) plus
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the size of any referred-to data (dsize). We then round the final
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size up to the chunksize for allocation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ksize += P2ROUNDUP(key[i].dttk_size, sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This should be pretty much impossible, but could happen if, say,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * strange DIF specified the tuple. Ideally, this should be an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * assertion and not an error condition -- but that requires that the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * chunksize calculation in dtrace_difo_chunksize() be absolutely
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * bullet-proof. (That is, it must not be able to be fooled by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * malicious DIF.) Given the lack of backwards branches in DIF,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * solving this would presumably not amount to solving the Halting
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Problem -- but it still seems awfully hard.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sizeof (dtrace_dynvar_t) + sizeof (dtrace_key_t) * (nkeys - 1) +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're out of dynamic variable space on
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this CPU. Unless we have tried all CPUs,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we'll try to allocate from a different
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * To increment the correct bean
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * counter, take another lap.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The clean list appears to be non-empty. We want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * move the clean list to the free list; we start by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * moving the clean pointer aside.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We are in one of two situations:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (a) The clean list was switched to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * free list by another CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (b) The clean list was added to by the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cleansing cyclic.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * In either of these situations, we can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * just reattempt the free list allocation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(clean->dtdv_hashval == DTRACE_DYNHASH_FREE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we'll move the clean list to our free list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It's impossible for this to fail: the only way
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the free list can be updated is through this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * code path, and only one CPU can own the clean list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Thus, it would only be possible for this to fail if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this code were racing with dtrace_dynvar_clean().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (That is, if dtrace_dynvar_clean() updated the clean
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * list, and we ended up racing to update the free
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * list.) This race is prevented by the dtrace_sync()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in dtrace_dynvar_clean() -- which flushes the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * owners of the clean lists out before resetting
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the clean lists.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rval = dtrace_casptr(&dcpu->dtdsc_free, NULL, clean);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_casptr(&dcpu->dtdsc_free, free, new_free) != free);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have now allocated a new chunk. We copy the tuple keys into the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * tuple array and copy any referenced key data into the data space
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * following the tuple array. As we do this, we relocate dttk_value
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the final tuple to point to the key data address in the chunk.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kdata = (uintptr_t)&dvar->dtdv_tuple.dtt_key[nkeys];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nkeys; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_casptr(&hash[bucket].dtdh_chain, start, dvar) == start)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The cas has failed. Either another CPU is adding an element to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this hash chain, or another CPU is deleting an element from this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hash chain. The simplest way to deal with both of these cases
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (though not necessarily the most efficient) is to free our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocated block and tail-call ourselves. Note that the free is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to the dirty list and _not_ to the free list. This is to prevent
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * races with allocators, above.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_casptr(&dcpu->dtdsc_dirty, free, dvar) != free);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (dtrace_dynvar(dstate, nkeys, key, dsize, op, mstate, vstate));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_min(uint64_t *oval, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_max(uint64_t *oval, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_quantize(uint64_t *quanta, uint64_t nval, uint64_t incr)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < zero; i++) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = zero + 1; i < VBDTCAST(int)DTRACE_QUANTIZE_NBUCKETS; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_lquantize(uint64_t *lquanta, uint64_t nval, uint64_t incr)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is an underflow.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is an overflow.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_avg(uint64_t *data, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_stddev(uint64_t *data, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * What we want to say here is:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * data[2] += nval * nval;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * But given that nval is 64-bit, we could easily overflow, so
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we do this as 128-bit arithmetic.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_multiply_128((uint64_t)snval, (uint64_t)snval, tmp);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_count(uint64_t *oval, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate_sum(uint64_t *oval, uint64_t nval, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Aggregate given the tuple in the principal data buffer, and the aggregating
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action denoted by the specified dtrace_aggregation_t. The aggregation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer is specified as the buf parameter. This routine does not return
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * failure; if there is no space in the aggregation buffer, the data will be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dropped, and a corresponding counter incremented.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggregate(dtrace_aggregation_t *agg, dtrace_buffer_t *dbuf,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync intptr_t offset, dtrace_buffer_t *buf, uint64_t expr, uint64_t arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Currently, only quantize() and lquantize() take additional
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * arguments, and they have the same semantics: an increment
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * value that defaults to 1 when not present. If additional
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aggregating actions take arguments, the setting of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * default argument value will presumably have to become more
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sophisticated...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync action = agg->dtag_action.dta_kind - DTRACEACT_AGGREGATION;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The metastructure is always at the bottom of the buffer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync agb = (dtrace_aggbuffer_t *)(tomax + buf->dtb_size -
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We just kludge up approximately 1/8th of the size to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buckets. If this guess ends up being routinely
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * off-the-mark, we may need to dynamically readjust this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * based on past performance.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t hashsize = (buf->dtb_size >> 3) / sizeof (uintptr_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((uintptr_t)agb - hashsize * sizeof (dtrace_aggkey_t *) <
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We've been given a ludicrously small buffer;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * increment our drop count and leave.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * And now, a pathetic attempt to try to get a an odd (or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * perchance, a prime) hash size for better hash distribution.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync agb->dtagb_hash = (dtrace_aggkey_t **)((uintptr_t)agb -
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Calculate the hash value based on the key. Note that we _don't_
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * include the aggid in the hashing (but we will store it as part of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the key). The hashing algorithm is Bob Jenkins' "One-at-a-time"
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * algorithm: a simple, quick algorithm that has no known funnels, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * gets good distribution in practice. The efficacy of the hashing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * algorithm (and a comparison with other algorithms) may be found by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * running the ::dtrace_aggstat MDB dcmd.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = agg->dtag_first; act->dta_intuple; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; i < limit; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Yes, the divide here is expensive -- but it's generally the least
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of the performance issues given the amount of data that we iterate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * over to compute hash values, compare data, etc.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (key = agb->dtagb_hash[ndx]; key != NULL; key = key->dtak_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (hashval != key->dtak_hashval || key->dtak_size != size)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(kdata >= tomax && kdata < tomax + buf->dtb_size);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; i < limit; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We are aggregating on the same value in the same
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aggregation with two different aggregating actions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This should have been picked up in the compiler,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * so we may be dealing with errant or devious DIF.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is an error condition; we indicate as much,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and return.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is a hit: we need to apply the aggregator to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the value at this key.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync agg->dtag_aggregate((uint64_t *)(kdata + size), expr, arg);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We didn't find it. We need to allocate some zero-filled space,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * link it into the hash table appropriately, and apply the aggregator
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to the (zero-filled) value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we don't have enough room to both allocate a new key _and_
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * its associated data, increment the drop count and return.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*CONSTCOND*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(!(sizeof (dtrace_aggkey_t) & (sizeof (uintptr_t) - 1)));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync key = (dtrace_aggkey_t *)(agb->dtagb_free - sizeof (dtrace_aggkey_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now copy the data across.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Because strings are not zeroed out by default, we need to iterate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * looking for actions that store strings, and we need to explicitly
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * pad these strings out with zeroes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = agg->dtag_first; act->dta_intuple; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, apply the aggregator.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((uint64_t *)(key->dtak_data + size)) = agg->dtag_initial;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync agg->dtag_aggregate((uint64_t *)(key->dtak_data + size), expr, arg);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Given consumer state, this routine finds a speculation in the INACTIVE
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state and transitions it into the ACTIVE state. If there is no speculation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the INACTIVE state, 0 is returned. In this case, no error counter is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * incremented -- it is up to the caller to take appropriate action.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint32_t *stat = &state->dts_speculations_unavail, count;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = &state->dts_speculations[i];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (i + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We couldn't find a speculation. If we found as much as a single
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * busy speculation buffer, we'll attribute this failure as "busy"
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * instead of "unavail".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32(stat, count, count + 1) != count);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This routine commits an active speculation. If the specified speculation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is not in a valid state to perform a commit(), this routine will silently do
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * nothing. The state of the specified speculation is transitioned according
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to the state transition diagram outlined in <sys/dtrace_impl.h>
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_speculation_commit(dtrace_state_t *state, processorid_t cpu,
18b5800940a99020935d542e80eba24616ddef48vboxsync dtrace_speculation_state_t current, new VBDTUNASS(-1);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync if (which > VBDTCAST(unsigned)state->dts_nspeculations) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cpu_core[cpu].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is only possible if we are (a) commit()'ing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * without having done a prior speculate() on this CPU
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and (b) racing with another commit() on a different
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CPU. There's nothing to do -- we just assert that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * our offset is 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This speculation is active on one CPU. If our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer offset is non-zero, we know that the one CPU
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * must be us. Otherwise, we are committing on a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * different CPU from the speculate(), and we must
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rely on being asynchronously cleaned.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have set the state to indicate that we are committing this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * speculation. Now reserve the necessary space in the destination
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((offs = dtrace_buffer_reserve(dest, src->dtb_offset,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have the space; copy the buffer across. (Note that this is a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * highly subobtimal bcopy(); in the unlikely event that this becomes
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a serious performance issue, a high-performance DTrace-specific
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * bcopy() should obviously be invented.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, the aligned portion.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now any left-over bit...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, commit the reserved space in the destination buffer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we're lucky enough to be the only active CPU on this speculation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer, we can just set the state back to DTRACESPEC_INACTIVE.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (current == DTRACESPEC_ACTIVEONE && new == DTRACESPEC_COMMITTING)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint32_t rval = dtrace_cas32((uint32_t *)&spec->dtsp_state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This routine discards an active speculation. If the specified speculation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is not in a valid state to perform a discard(), this routine will silently
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * do nothing. The state of the specified speculation is transitioned
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * according to the state transition diagram outlined in <sys/dtrace_impl.h>
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_speculation_discard(dtrace_state_t *state, processorid_t cpu,
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync if (which > VBDTCAST(unsigned)state->dts_nspeculations) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cpu_core[cpu].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: not called from probe context. This function is called
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * asynchronously from cross call context to clean any speculations that are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the COMMITTINGMANY or DISCARDING states. These speculations may not be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * transitioned back to the INACTIVE state until all CPUs have cleaned the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * speculation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_speculation_clean_here(dtrace_state_t *state)
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync for (i = 0; i < VBDTCAST(unsigned)state->dts_nspeculations; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = &state->dts_speculations[i];
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncstatic DECLCALLBACK(void) dtrace_speculation_clean_here_wrapper(RTCPUID idCpu, void *pvUser1, void *pvUser2)
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync dtrace_speculation_clean_here((dtrace_state_t *)pvUser1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: not called from probe context. This function is called
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * asynchronously (and at a regular interval) to clean any speculations that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are in the COMMITTINGMANY or DISCARDING states. If it discovers that there
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is work to be done, it cross calls all CPUs to perform that work;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * COMMITMANY and DISCARDING speculations may not be transitioned back to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * INACTIVE state until they have been cleaned by all CPUs.
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync for (i = 0; i < VBDTCAST(unsigned)state->dts_nspeculations; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = &state->dts_speculations[i];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (dtrace_xcall_t)dtrace_speculation_clean_here, state);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync RTMpOnAll(dtrace_speculation_clean_here_wrapper, state, NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We now know that all CPUs have committed or discarded their
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * speculation buffers, as appropriate. We can now set the state
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to inactive.
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync for (i = 0; i < VBDTCAST(unsigned)state->dts_nspeculations; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = &state->dts_speculations[i];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rv = dtrace_cas32((uint32_t *)&spec->dtsp_state, current, new);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync ASSERT(VBDTCAST(dtrace_speculation_state_t)rv == current);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Called as part of a speculate() to get the speculative buffer associated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * with a given speculation. Returns NULL if the specified speculation is not
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in an ACTIVE state. If the speculation is in the ACTIVEONE state -- and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the active CPU is not the specified CPU -- the speculation will be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * atomically transitioned into the ACTIVEMANY state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_speculation_buffer(dtrace_state_t *state, processorid_t cpuid,
18b5800940a99020935d542e80eba24616ddef48vboxsync dtrace_speculation_state_t current, new VBDTUNASS(-1);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync if (which > VBDTCAST(unsigned)state->dts_nspeculations) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cpu_core[cpuid].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This speculation is currently active on one CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check the offset in the buffer; if it's non-zero,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that CPU must be us (and we leave the state alone).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If it's zero, assume that we're starting on a new
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CPU -- and change the state to indicate that the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * speculation is active on more than one CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(new == DTRACESPEC_ACTIVEONE || new == DTRACESPEC_ACTIVEMANY);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Return a string. In the event that the user lacks the privilege to access
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * arbitrary kernel memory, we copy the string out to scratch memory so that we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * don't fail access checking.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_dif_variable() uses this routine as a helper for various
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * builtin values such as 'execname' and 'probefunc.'
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dif_varstr(uintptr_t addr, dtrace_state_t *state,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The easy case: this probe is allowed to read all of memory, so
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we can just return this as a vanilla pointer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the tougher case: we copy the string in question from
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * kernel memory into scratch memory and return it that way: this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * ensures that we won't trip up when access checking tests the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * BYREF return value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_scratch_base + mstate->dtms_scratch_size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_strcpy((const void *)addr, (void *)mstate->dtms_scratch_ptr,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This function implements the DIF emulator's variable lookups. The emulator
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * passes a reserved variable identifier and optional built-in array index.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dif_variable(dtrace_mstate_t *mstate, dtrace_state_t *state, uint64_t v,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we're accessing one of the uncached arguments, we'll turn this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * into a reference in the args array.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync switch (v) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int aframes = mstate->dtms_probe->dtpr_aframes + 2;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is regrettably required to keep the compiler
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from tail-optimizing the call to dtrace_getarg().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The condition always evaluates to true, but the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * compiler has no way of figuring that out a priori.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (None of this would be necessary if the compiler
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * could be relied upon to _always_ tail-optimize
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the call to dtrace_getarg() -- but it can't.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval = NULL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_TIMESTAMP)) {
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_WALLTIMESTAMP)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_present |= DTRACE_MSTATE_WALLTIMESTAMP;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_STACKDEPTH)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int aframes = mstate->dtms_probe->dtpr_aframes + 2;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_stackdepth = dtrace_getstackdepth(aframes);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_USTACKDEPTH)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_CALLER)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int aframes = mstate->dtms_probe->dtpr_aframes + 2;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is an unanchored probe, we are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * required to go through the slow path:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_caller() only guarantees correct
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * results for anchored probes.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync dtrace_caller(aframes)) == VBDTCAST(uintptr_t)-1) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have failed to do this the quick way;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we must resort to the slower approach of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * calling dtrace_getpcstack().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(mstate->dtms_present & DTRACE_MSTATE_UCALLER)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_getupcstack() fills in the first uint64_t
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * with the current PID. The second uint64_t will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be the program counter at user-level. The third
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * uint64_t will contain the caller, which is what
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're after.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (uintptr_t)mstate->dtms_probe->dtpr_provider->dtpv_name,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note that we are assuming that an unanchored probe is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * always due to a high-level interrupt. (And we're assuming
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that there is only a single high level interrupt.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Further, it is always safe to dereference the p_pidp member
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of one's own proc structure. (These are truisms becuase
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * threads and processes don't clean up their own state --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * they leave that task to whomever reaps them.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return ((uint64_t)curthread->t_procp->p_pidp->pid_id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This is true because threads don't clean up their own
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state -- they leave that task to whomever reaps them.)
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0); /** @todo parent pid? */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (RTThreadNativeSelf()); /** @todo proper tid? */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This is true because threads don't clean up their own
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state -- they leave that task to whomever reaps them.)
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0); /** @todo execname */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return ((uint64_t)(uintptr_t)p0.p_zone->zone_name);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This is true because threads don't clean up their own
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state -- they leave that task to whomever reaps them.)
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This is true because threads don't clean up their own
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state -- they leave that task to whomever reaps them.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Additionally, it is safe to dereference one's own process
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * credential, since this is never NULL after process birth.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return ((uint64_t)curthread->t_procp->p_cred->cr_uid);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_procp pointer:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it always points to a valid, allocated proc structure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (This is true because threads don't clean up their own
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state -- they leave that task to whomever reaps them.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Additionally, it is safe to dereference one's own process
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * credential, since this is never NULL after process birth.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return ((uint64_t)curthread->t_procp->p_cred->cr_gid);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It is always safe to dereference one's own t_lwp pointer in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the event that this pointer is non-NULL. (This is true
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * because threads and lwps don't clean up their own state --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * they leave that task to whomever reaps them.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Emulate the execution of DTrace ID subroutines invoked by the call opcode.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Notice that we don't bother validating the proper number of arguments or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * their types in the tuple stack. This isn't needed because all argument
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interpretation is safe because of our load safety -- the worst that can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * happen is that a bogus program can obtain bogus results.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dif_subr(uint_t subr, uint_t rd, uint64_t *regs,
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync volatile uint16_t *flags = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync volatile uintptr_t *illval = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = (dtrace_gethrtime() * 2416 + 374441) % 1771875;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (uintptr_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (krwlock_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(tupregs[0].dttk_value, sizeof (krwlock_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to be sure that the destination is in the scratch
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * region -- no other region is allowed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t dest = P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync tupregs[subr == DIF_SUBR_ALLOCA ? 0 : 1].dttk_value;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size_t scratch_size = (dest - mstate->dtms_scratch_ptr) + size;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This action doesn't require any credential checks since
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes will not activate in user contexts to which the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling user does not have permissions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Rounding up the user allocation size could have overflowed
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a large, bogus allocation (like -1ULL) to 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_copyin(tupregs[0].dttk_value, dest, size, flags);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This action doesn't require any credential checks since
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes will not activate in user contexts to which the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling user does not have permissions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_copyin(tupregs[0].dttk_value, dest, size, flags);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This action doesn't require any credential checks since
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes will not activate in user contexts to which the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling user does not have permissions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_copyinstr(tupregs[0].dttk_value, dest, size, flags);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (baddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(baddr, sizeof (mblk_t), mstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We want to prevent against denial-of-service here,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * so we're only going to search the list for
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_msgdsize_max mblks.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (p = curthread->t_procp; p != NULL; p = p->p_parent) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(addr, sz + 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're going to iterate over the string looking for the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified character. We will iterate until we have reached
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the string length or we have found the character. If this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is DIF_SUBR_STRRCHR, we will look for the last occurrence
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of the specified character instead of the first.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t limit = addr + state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(saddr, addr - saddr, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're going to iterate over the string looking for the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified string. We will iterate until we have reached
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the string length or we have found the string. (Yes, this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is done in the most naive way possible -- but considering
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that the string we're searching for is likely to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * relatively short, the complexity of Rabin-Karp or similar
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hardly seems merited.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char *addr = (char *)(uintptr_t)tupregs[0].dttk_value;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char *substr = (char *)(uintptr_t)tupregs[1].dttk_value;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload((uintptr_t)addr, len + 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload((uintptr_t)substr, sublen + 1, mstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * strstr() and index()/rindex() have similar semantics if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * both strings are the empty string: strstr() returns a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * pointer to the (empty) string, and index() and rindex()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * both return index 0 (regardless of any position argument).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Both index() and rindex() take an optional position
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * argument that denotes the starting position.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the position argument to index() is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * negative, Perl implicitly clamps it at
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * zero. This semantic is a little surprising
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * given the special meaning of negative
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * positions to similar Perl functions like
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * substr(), but it appears to reflect a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * notion that index() can start from a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * negative index and increment its way up to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the string. Given this notion, Perl's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rindex() is at least self-consistent in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that it implicitly clamps positions greater
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * than the string length to be the string
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * length. Where Perl completely loses
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * coherence, however, is when the specified
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * substring is the empty string (""). In
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this case, even if the position is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * negative, rindex() returns 0 -- and even if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the position is greater than the length,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * index() returns the string length. These
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * semantics violate the notion that index()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * should never return a value less than the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified position and that rindex() should
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * never return a value greater than the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified position. (One assumes that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * these semantics are artifacts of Perl's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * implementation and not the results of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * deliberate design -- it beggars belief that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * even Larry Wall could desire such oddness.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * While in the abstract one would wish for
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * consistent position semantics across
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * substr(), index() and rindex() -- or at the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * very least self-consistent position
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * semantics for index() and rindex() -- we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * instead opt to keep with the extant Perl
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * semantics, in all their broken glory. (Do
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we have more desire to maintain Perl's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * semantics than Perl does? Probably.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (regs[rd] = notfound; addr != limit; addr += inc) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * As D index() and rindex() are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * modeled on Perl (and not on awk),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we return a zero-based (and not a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * one-based) index. (For you Perl
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * weenies: no, we're not going to add
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * $[ -- and shouldn't you be at a con
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or something?)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync VBDTTYPE(unsigned,int) i;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check both the token buffer and (later) the input buffer,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * since both could be non-scratch addresses.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_strcanload(tokaddr, size, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the address specified is NULL, we use our saved
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * strtok pointer from the mstate. Note that this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * means that the saved strtok pointer is _only_
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * valid within multiple enablings of the same probe --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it behaves like an implicit clause-local variable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the user-specified address is non-NULL we must
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * access check it. This is the only time we have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a chance to do so, since this address may reside
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the string table of this clause-- future calls
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (when we fetch addr from mstate->dtms_strtok)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * would fail this access check.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_strcanload(addr, size, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, zero the token map, and then process the token
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * string -- setting a bit in the map for every character
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * found in the token string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < sizeof (tokmap); i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're looking for a character that is _not_ contained
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the token string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c == '\0') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We reached the end of the string without finding
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * any character that was not in the token string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We return NULL in this case, and we set the saved
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * address to NULL as well.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * From here on, we're copying into the destination string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; addr < limit && i < size - 1; addr++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int64_t remaining = (int64_t)tupregs[2].dttk_value;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } else if (remaining < 0) {
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync } else if (VBDTCAST(uint64_t)index + remaining > size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < remaining; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync d[i] = '\0';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = (tupregs[0].dttk_value >> NBITSMINOR64) & MAXMAJ64;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = (tupregs[0].dttk_value >> NBITSMINOR) & MAXMAJ;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This one is a galactic mess. We are going to roughly
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * emulate ddi_pathname(), but it's made more complicated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * by the fact that we (a) want to include the minor name and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (b) must proceed iteratively instead of recursively.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char *start = (char *)dest, *end = start + size - 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Due to all the pointer jumping we do and context we must
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rely upon, we just mandate that the user must have kernel
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * read privileges to use this routine.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We want to have a name for the minor. In order to do this,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we need to walk the minor list from the devinfo. We want
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to be sure that we don't infinitely walk a circular list,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * so we check for circularity by sending a scout pointer
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * ahead two elements for every element that we iterate over;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * if the list is circular, these will ultimately point to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * same element. You may recognize this little trick as the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * answer to a stupid interview question -- one that always
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * seems to be asked by those who had to have it laboriously
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * explained to them, and who can't even concisely describe
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the conditions under which one would be forced to resort to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this technique. Needless to say, those conditions are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * found here -- and probably only here. Is this the only use
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of this infamous trick in shipping, production code? If it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * isn't, it probably should be...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t next = offsetof(struct ddi_minor_data, next);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (maddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have the minor data. Now we need to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * copy the minor's name into the end of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * pathname.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (daddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now for the node name...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If our parent is NULL (that is, if we're the root
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * node), we're going to use the special path
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * "devices".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync s = "devices";
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync VBDTTYPE(unsigned,int) i = 0;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_strcanload(s1, size, mstate, vstate) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i >= size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i >= size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = 22; /* enough room for 2^64 in decimal */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char *end = (char *)mstate->dtms_scratch_ptr + size - 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i == 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = DT_BSWAP_16((uint16_t)tupregs[0].dttk_value);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = DT_BSWAP_32((uint32_t)tupregs[0].dttk_value);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = DT_BSWAP_64((uint64_t)tupregs[0].dttk_value);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync int i, j, len = VBDTCAST(int)dtrace_strlen((char *)src, size);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(src, len + 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The basename and dirname for a zero-length string is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * defined to be "."
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Start from the back of the string, moving back toward the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * front until we see a character that isn't a slash. That
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * character is the last character in the basename.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i >= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Starting from the last character in the basename, move
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * towards the front until we find a slash. The character
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that we processed immediately before that is the first
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * character in the basename.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; i >= 0; i--) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i >= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now keep going until we find a non-slash character. That
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * character is the last character in the dirname.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; i >= 0; i--) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (i >= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We didn't find a non-slash character. We know that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the length is non-zero, so the whole string must be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * slashes. In either the dirname or the basename
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * case, we return '/'.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The entire string consists only of a basename
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * component. If we're looking for dirname, we need
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to change our string to be just "."; if we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * looking for a basename, we'll just set the first
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * character of the basename to be 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We know that we have a slash in the name --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or lastdir would be set to 0, above. And
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * because lastdir is -1, we know that this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * slash must be the first character. (That
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is, the full string must be of the form
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * "/basename".) In this case, the last
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * character of the directory name is 0.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = start, j = 0; i <= end && VBDTCAST(unsigned)j < size - 1; i++, j++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int i = 0, j = 0;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_strcanload(src, size, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Move forward, loading each character.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (j + 5 >= VBDTCAST(int64_t)size) /* 5 = strlen("/..c\0") */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c != '/') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c == '/') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have two slashes -- we can just advance
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to the next character.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c != '.') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is not "." and it's not ".." -- we can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * just store the "/" and this character and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * drive on.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c == '/') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is a "/./" component. We're not going
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to store anything in the destination buffer;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're just going to go to the next component.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c != '.') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is not ".." -- we can just store the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * "/." and this character and continue
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is not ".." -- it's "..[mumble]".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We'll store the "/.." and this character
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and continue processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is "/../" or "/..\0". We need to back up
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * our destination pointer until we find a "/".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (c != '\0');
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync af = subr == DIF_SUBR_INET_NTOA ? AF_INET: AF_INET6;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Safely load the IPv4 address.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check an IPv4 string will fit in scratch.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Stringify as a dotted decimal quad.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 3; i >= 0; i--) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (val == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Stringify using RFC 1884 convention 2 - 16 bit
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hexadecimal values with a zero-run compression.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Lower case hexadecimal digits are used.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * eg, fe80::214:4fff:fe0b:76c8.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The IPv4 embedded form is returned for inet_ntop,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * just the IPv4 string is returned for inet_ntoa6.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Safely load the IPv6 address.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void *)(uintptr_t)&ip6, sizeof (struct in6_addr));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check an IPv6 string will fit in scratch.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Find the longest run of 16 bit zero values
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for the single allowed zero compression - "::".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < sizeof (struct in6_addr); i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(firstzero + numzero <= sizeof (struct in6_addr));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check for an IPv4 embedded address.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (val == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set v6end to skip the IPv4 address that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we have already stringified.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Build the IPv6 string by working through the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * address in reverse.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (val == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The user didn't use AH_INET or AH_INET6.
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync#else /* VBOX */
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync#endif /* VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Emulate the execution of DTrace IR instructions specified by the given
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DIF object. This function is deliberately void of assertions as all of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the necessary checks are handled by a call to dtrace_difo_validate().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dif_emulate(dtrace_difo_t *difo, dtrace_mstate_t *mstate,
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync volatile uint16_t *flags = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync volatile uintptr_t *illval = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_key_t tupregs[DIF_DTR_NREGS + 2]; /* +2 for thread and id */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We stash the current DIF object into the machine state: we need it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for subsequent access checking.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (pc < textlen && !(*flags & CPU_DTRACE_FAULT)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 2, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 4, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 2, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 4, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[r1], 8, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the 0th byte is set to UINT8_MAX
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * then this is to be treated as a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * reference to a NULL variable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync regs[rd] = dtrace_dif_variable(mstate, state, id, 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a += sizeof (uint64_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void *)a, &v->dtdv_type);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There are no DTrace built-in thread-local arrays at
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * present. This opcode is saved for future work.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For now, this has no meaning.
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync ASSERT(VBDTCAST(int64_t)id < vstate->dtvs_nlocals);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the 0th byte is set to UINT8_MAX
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * then this is to be treated as a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * reference to a NULL variable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(svar->dtsv_size == NCPU * sizeof (uint64_t));
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync ASSERT(VBDTCAST(int64_t)id < vstate->dtvs_nlocals);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync a += sizeof (uint64_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void *)a, &v->dtdv_type);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(svar->dtsv_size == NCPU * sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Given that we're storing to thread-local data,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we need to flush our predicate cache.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is a string type and the size is 0,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we'll use the system-wide default string
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size. Note that we are _not_ looking at
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the value of the DTRACEOPT_STRSIZE option;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * had this been set, we would expect to have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a non-zero size value in the "pushtr".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t ptr = P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size_t size = ptr - mstate->dtms_scratch_ptr + regs[r1];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Rounding up the user allocation size could have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * overflowed large, bogus allocations (like -1ULL) to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_bzero((void *) mstate->dtms_scratch_ptr, size);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canload(regs[r1], regs[r2], mstate, vstate))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[rd], 1, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((uint8_t *)(uintptr_t)regs[rd]) = (uint8_t)regs[r1];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[rd], 2, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((uint16_t *)(uintptr_t)regs[rd]) = (uint16_t)regs[r1];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[rd], 4, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *((uint32_t *)(uintptr_t)regs[rd]) = (uint32_t)regs[r1];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_canstore(regs[rd], 8, mstate, vstate)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t mask = (0xf << (sizeof (uintptr_t) * NBBY / 4));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int shift = (sizeof (uintptr_t) * NBBY) - 4, i = 0;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It's impossible to be taking action on the NULL probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is a poor man's (destitute man's?) sprintf(): we want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * print the provider name, module name, function name and name of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the probe, along with the hex address of the ECB with the breakpoint
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action -- all of which we must place in the character buffer by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = *msg++;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = ':';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = ':';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = ':';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = *ecbmsg++;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (shift >= 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = "0123456789abcdef"[(val & mask) >> shift];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i++] = ')';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync c[i] = '\0';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * It's impossible to be taking action on the NULL probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_casptr(&dtrace_panicked, NULL, curthread) != NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We won the right to panic. (We want to be sure that only one
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * thread calls panic() from dtrace_probe(), and that panic() is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * called exactly once.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_panic("dtrace: panic action at probe %s:%s:%s:%s (ecb %p)",
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * raise() has a queue depth of 1 -- we ignore all subsequent
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * invocations of the raise() action.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_action_chill(dtrace_mstate_t *mstate, hrtime_t val)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync flags = (volatile uint16_t *)&cpu_core[cpu->cpu_id].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (now - cpu->cpu_dtrace_chillmark > dtrace_chill_interval) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to advance the mark to the current time.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now check to see if the requested chill time would take us over
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the maximum amount of time allowed in the chill interval. (Or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * worse, if the calculation itself induces overflow.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (cpu->cpu_dtrace_chilled + val > dtrace_chill_max ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cpu->cpu_dtrace_chilled + val < cpu->cpu_dtrace_chilled) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Normally, we assure that the value of the variable "timestamp" does
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not change within an ECB. The presence of chill() represents an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * exception to this rule, however.
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync#endif /* !VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_action_ustack(dtrace_mstate_t *mstate, dtrace_state_t *state,
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync uint16_t *flags = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
5acc2df47b1d0a4d2321774fc4e1b6c3edcae14avboxsync uint16_t volatile *flags = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Should be taking a faster path if string space has not been
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocated.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We will first allocate some temporary space for the frame pointers.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync fps = (uint64_t *)P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (!DTRACE_INSCRATCH(mstate, VBDTCAST(unsigned)size)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Not enough room for our frame pointers -- need to indicate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that we ran out of scratch space.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now get a stack with both program counters and frame pointers.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If that faulted, we're cooked.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we want to walk up the stack, calling the USTACK helper. For
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * each iteration, we restore the scratch pointer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nframes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we faulted while running the helper, we're going to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * clear the fault and null out the corresponding string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now copy in the string that the helper returned to us.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we didn't have room for all of the strings, we don't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * abort processing -- this needn't be a fatal error -- but we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * still want to increment a counter (dts_stkstroverflows) to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allow this condition to be warned about. (If this is from
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a jstack() action, it is easily tuned via jstackstrsize.)
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsyncextern void dtrace_probe6(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5);
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync# define dtrace_probe_error(a1, a2, a3, a4, a5, a6) \
eb2f5f1500a6606958394ec3f07a67f481aad4fdvboxsync dtrace_probe6(dtrace_probeid_error, (uintptr_t)a1, a2, a3, a4, a5, a6)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If you're looking for the epicenter of DTrace, you just found it. This
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is the function called by the provider to fire a probe -- from which all
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * subsequent probe-context DTrace activity emanates.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe(dtrace_id_t id, uintptr_t arg0, uintptr_t arg1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Kick out immediately if this CPU is still being born (in which case
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * curthread will be set to -1) or the current thread can't allow
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes in its current context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (((uintptr_t)curthread & 1) || (curthread->t_flag & T_DONTDTRACE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!onintr && probe->dtpr_predcache != DTRACE_CACHEIDNONE &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have hit in the predicate cache; we know that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this predicate would evaluate to be false.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We don't trace anything if we're panicking.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync curthread->t_dtrace_vtime += now - curthread->t_dtrace_start;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync flags = (volatile uint16_t *)&cpu_core[cpuid].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (ecb = probe->dtpr_ecb; ecb != NULL; ecb = ecb->dte_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_buffer_t *aggbuf = &state->dts_aggbuffer[cpuid];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * A little subtlety with the following (seemingly innocuous)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * declaration of the automatic 'val': by looking at the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * code, you might think that it could be declared in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action processing loop, below. (That is, it's only used in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the action processing loop.) However, it must be declared
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * out of that scope because in the case of DIF expression
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * arguments to aggregating actions, one iteration of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action loop will use the last iteration's value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate.dtms_present = DTRACE_MSTATE_ARGS | DTRACE_MSTATE_PROBE;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If dtrace itself is the provider of this probe,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're only going to continue processing the ECB if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * arg0 (the dtrace_state_t) is equal to the ECB's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * creating state. (This prevents disjoint consumers
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from seeing one another's metaprobes.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_ACTIVE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're not currently active. If our provider isn't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the dtrace pseudo provider, we're not interested.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we must further check if we are in the BEGIN
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probe. If we are, we will only continue processing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * if we're still in WARMUP -- if one BEGIN enabling
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * has invoked the exit() action, we don't want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * evaluate subsequent BEGIN enablings.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the dte_cond bits indicate that this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * consumer is only allowed to see user-mode firings
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of this probe, call the provider's dtps_usermode()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * entry point to check that the probe was fired
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * while in a user context. Skip this ECB if that's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not the case.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is more subtle than it looks. We have to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * absolutely certain that CRED() isn't going to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * change out from under us so it's only legit to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * examine that structure if we're in constrained
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * situations. Currently, the only times we'll this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * check is if a non-super-user has enabled the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * profile or syscall providers -- providers that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allow visibility of all processes. For the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * profile case, the check above will ensure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're examining a user context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (now - state->dts_alive > dtrace_deadman_timeout) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We seem to be dead. Unless we (a) have kernel
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * destructive permissions (b) have expicitly enabled
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * destructive actions and (c) destructive actions have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not been disabled, we're going to transition into
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the KILLED state, from which no further processing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * on this state will be performed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((offs = dtrace_buffer_reserve(buf, ecb->dte_needed,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACE_STORE(uint32_t, tomax, offs, ecb->dte_epid);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rval = dtrace_dif_emulate(dp, &mstate, vstate, state);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Update the predicate cache...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action; !(*flags & CPU_DTRACE_ERROR) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note that we always pass the expression
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * value from the previous iteration of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action loop. This value will only be used
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * if there is an expression argument to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aggregating action, denoted by the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtag_hasarg field.
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync VBDTCAST(int)(size / sizeof (pc_t)), probe->dtpr_aframes,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See comment in DIF_VAR_PID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the slow path -- we have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocated string space, and we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * getting the stack of a process that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * has helpers. Call into a separate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * routine to perform this processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync val = dtrace_dif_emulate(dp, &mstate, vstate, state);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to commit our buffer state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For the exit action, we are going to attempt
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to atomically set our activity to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * draining. If this fails (either because
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * another CPU has beat us to the exit action,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or because our current activity is something
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * other than ACTIVE or WARMUP), we will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * continue. This assures that the exit action
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * can be successfully recorded at most once
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * when we're in the ACTIVE state. If we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * encountering the exit() action while in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * COOLDOWN, however, we want to honor the new
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * status code. (We know that we're the only
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * thread in COOLDOWN, so there is no race.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is a string, we're going to only
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * load until we find the zero byte -- after
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * which we'll store zero bytes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (s = 0; s < size; s++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c != '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint8_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint16_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint32_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint64_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Any other size should have been returned by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * reference, not by value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There's nothing we can do -- we had an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * error on the error probe. We bump an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * error counter to at least indicate that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this condition happened.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before recursing on dtrace_probe(), we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * need to explicitly clear out our start
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * time to prevent it from being accumulated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * into t_dtrace_vtime.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate over the actions to figure out which action
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we were processing when we experienced the error.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note that act points _past_ the faulting action; if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * act is ecb->dte_action, the fault was in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * predicate, if it's ecb->dte_action->dta_next it's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in action #1, and so on.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate.dtms_fltoffs : -1, DTRACE_FLAGS2FLT(*flags),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Probe Hashing Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The functions in this section (and indeed, the functions in remaining
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sections) are not _called_ from probe context. (Any exceptions to this are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * marked with a "Note:".) Rather, they are called from elsewhere in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace framework to look-up probes in, add probes to and remove probes from
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the DTrace probe hashes. (Each probe is hashed by each element of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probe tuple -- allowing for fast lookups, regardless of what was
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync unsigned int g;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (*p) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_hash_create(uintptr_t stroffs, uintptr_t nextoffs, uintptr_t prevoffs)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_hash_t *hash = kmem_zalloc(sizeof (dtrace_hash_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync new_tab = kmem_zalloc(new_size * sizeof (void *), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < size; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (bucket = hash->dth_tab[i]; bucket != NULL; bucket = next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(hash->dth_tab, hash->dth_size * sizeof (void *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_hash_add(dtrace_hash_t *hash, dtrace_probe_t *new)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; bucket != NULL; bucket = bucket->dthb_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bucket = kmem_zalloc(sizeof (dtrace_hashbucket_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(*nextp == NULL && *(DTRACE_HASHPREV(hash, new)) == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_hash_lookup(dtrace_hash_t *hash, dtrace_probe_t *template)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; bucket != NULL; bucket = bucket->dthb_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_HASHEQ(hash, bucket->dthb_chain, template))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_hash_collisions(dtrace_hash_t *hash, dtrace_probe_t *template)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; bucket != NULL; bucket = bucket->dthb_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_HASHEQ(hash, bucket->dthb_chain, template))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_hash_remove(dtrace_hash_t *hash, dtrace_probe_t *probe)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int ndx = DTRACE_HASHSTR(hash, probe) & hash->dth_mask;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probe_t **prevp = DTRACE_HASHPREV(hash, probe);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probe_t **nextp = DTRACE_HASHNEXT(hash, probe);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Find the bucket that we're removing this probe from.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; bucket != NULL; bucket = bucket->dthb_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACE_HASHEQ(hash, bucket->dthb_chain, probe))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The removed probe was the only probe on this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * bucket; we need to remove the bucket.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Utility Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These are random utility functions that are _not_ called from probe context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Return a duplicate copy of a string. If the specified string is NULL,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this function returns a zero-length string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncstatic char *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char *new = kmem_zalloc((str != NULL ? strlen(str) : 0) + 1, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!DTRACE_ISALPHA(c) && c != '-' && c != '_' && c != '.')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while ((c = *s++) != '\0') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_cred2priv(cred_t *cr, uint32_t *privp, uid_t *uidp, zoneid_t *zoneidp)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (cr == NULL || PRIV_POLICY_ONLY(cr, PRIV_ALL, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For DTRACE_PRIV_ALL, the uid and zoneid don't matter.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_KERNEL, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync else if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_PROC, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int hval = dtrace_hash_str((char *)str) % DTRACE_ERRHASHSZ;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Matching Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These functions are used to match groups of probes, given some elements of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a probe tuple, or some globbed expressions for elements of a probe tuple.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_priv(const dtrace_probe_t *prp, uint32_t priv, uid_t uid,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint32_t ppriv = prp->dtpr_provider->dtpv_priv.dtpp_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * No PRIV_DTRACE_* privileges...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * No matching bits, but there were bits to match...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Need to have permissions to the process, but don't...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Need to be in the same zone unless we possess the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * privilege to examine all zones.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (((ppriv & ~match) & DTRACE_PRIV_ZONEOWNER) != 0 &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync zoneid != prp->dtpr_provider->dtpv_priv.dtpp_zoneid) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_match_probe compares a dtrace_probe_t to a pre-compiled key, which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * consists of input pattern strings and an ops-vector to evaluate them.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This function returns >0 for match, 0 for no match, and <0 for error.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_probe(const dtrace_probe_t *prp, const dtrace_probekey_t *pkp,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = pkp->dtpk_pmatch(pvp->dtpv_name, pkp->dtpk_prov, 0)) <= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = pkp->dtpk_mmatch(prp->dtpr_mod, pkp->dtpk_mod, 0)) <= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = pkp->dtpk_fmatch(prp->dtpr_func, pkp->dtpk_func, 0)) <= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = pkp->dtpk_nmatch(prp->dtpr_name, pkp->dtpk_name, 0)) <= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_match_priv(prp, priv, uid, zoneid) == 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_match_glob() is a safe kernel implementation of the gmatch(3GEN)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interface for matching a glob pattern 'p' to an input string 's'. Unlike
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * libc's version, the kernel version only applies to 8-bit ASCII strings.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * In addition, all of the recursion cases except for '*' matching have been
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * unwound. For '*', we still implement recursive evaluation, but a depth
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * counter is maintained and matching is aborted if we recurse too deep.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The function returns 0 if no match, >0 if match, and <0 if recursion error.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_glob(const char *s, const char *p, int depth)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((c = *p++) == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync switch (c) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case '[': {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (*p == '!') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((c = *p++) == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((c = *p++) == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync lc = c; /* save left-hand 'c' for next iteration */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } else if (s1 == c)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((c = *p++) == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (c != ']');
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((c = *p++) == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHRU*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHRU*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while (*p == '*')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync p++; /* consecutive *'s are identical to a single one */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (*p == '\0')
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((gs = dtrace_match_glob(s, p, depth + 1)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_string(const char *s, const char *p, int depth)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_nul(const char *s, const char *p, int depth)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match_nonzero(const char *s, const char *p, int depth)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_match(const dtrace_probekey_t *pkp, uint32_t priv, uid_t uid,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync zoneid_t zoneid, int (*matched)(dtrace_probe_t *, void *), void *arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the probe ID is specified in the key, just lookup by ID and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * invoke the match callback once if a matching probe is found.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((probe = dtrace_probe_lookup_id(pkp->dtpk_id)) != NULL &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_match_probe(probe, pkp, priv, uid, zoneid) > 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We want to find the most distinct of the module name, function
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * name, and name. So for each one that is not a glob pattern or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * empty string, we perform a lookup in the corresponding hash and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * use the hash table with the fewest collisions to do our search.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (len = dtrace_hash_collisions(dtrace_bymod, &template)) < best) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (len = dtrace_hash_collisions(dtrace_byfunc, &template)) < best) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (len = dtrace_hash_collisions(dtrace_byname, &template)) < best) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we did not select a hash table, iterate over every probe and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * invoke our callback for each one that matches our input probe key.
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync for (i = 0; i < VBDTCAST(dtrace_id_t)dtrace_nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we selected a hash table, iterate over each probe of the same key
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * name and invoke the callback for every probe that matches the other
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * attributes of our input probe key.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (probe = dtrace_hash_lookup(hash, &template); probe != NULL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_match_probe(probe, pkp, priv, uid, zoneid) <= 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rc = (*matched)(probe, arg)) != DTRACE_MATCH_NEXT) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Return the function pointer dtrace_probecmp() should use to compare the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified pattern with a string. For NULL or empty patterns, we select
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_match_nul(). For glob pattern strings, we use dtrace_match_glob().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For non-empty non-glob strings, we use dtrace_match_string().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync while ((c = *p++) != '\0') {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Build a probe comparison key for use with dtrace_match_probe() from the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * given probe description. By convention, a null key only matches anchored
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes: if each field is the empty string, reset dtpk_fmatch to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_match_nonzero().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probekey(const dtrace_probedesc_t *pdp, dtrace_probekey_t *pkp)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkp->dtpk_pmatch = dtrace_probekey_func(pdp->dtpd_provider);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkp->dtpk_mmatch = dtrace_probekey_func(pdp->dtpd_mod);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkp->dtpk_fmatch = dtrace_probekey_func(pdp->dtpd_func);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkp->dtpk_nmatch = dtrace_probekey_func(pdp->dtpd_name);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Provider-to-Framework API Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These functions implement much of the Provider-to-Framework API, as
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * described in <sys/dtrace.h>. The parts of the API not in this section are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the functions in the API for probe management (found below), and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_probe() itself (found above).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Register the calling provider with the DTrace framework. This should
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * generally be called by DTrace providers in their attach(9E) entry point.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_register(const char *name, const dtrace_pattr_t *pap, uint32_t priv,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cred_t *cr, const dtrace_pops_t *pops, void *arg, dtrace_provider_id_t *idp)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (name == NULL || pap == NULL || pops == NULL || idp == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': invalid "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': invalid "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pops->dtps_provide == NULL && pops->dtps_provide_module == NULL) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pops->dtps_enable == NULL || pops->dtps_disable == NULL ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((pops->dtps_resume == NULL) != (pops->dtps_suspend == NULL))) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': invalid "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': invalid "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': invalid "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register provider '%s': need "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "dtps_usermode() op for given privilege attributes", name);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync provider = kmem_zalloc(sizeof (dtrace_provider_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync provider->dtpv_name = kmem_alloc(strlen(name) + 1, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, const dtrace_probedesc_t *))dtrace_nullop;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void (*)(void *, dtrace_id_t, void *))dtrace_nullop;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We make sure that the DTrace provider is at the head of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the provider chain.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there is at least one provider registered, we'll add this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * provider after the first provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we need to call dtrace_enabling_matchall() -- which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * will acquire cpu_lock and dtrace_lock. We therefore need
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to drop all of our locks before calling into it...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Unregister the specified provider from the DTrace framework. This should
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * generally be called by DTrace providers in their detach(9E) entry point.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (int (*)(void *, dtrace_id_t, void *))dtrace_enable_nullop) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If DTrace itself is the provider, we're called with locks
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * already held.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There's another provider here; return failure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If anyone has /dev/dtrace open, or if there are anonymous enabled
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes, we refuse to let providers slither away, unless this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * provider has already been explicitly invalidated.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Attempt to destroy the probes associated with this provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have at least one ECB; we can't remove this provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * All of the probes for this provider are disabled; we can safely
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * remove all of them from their hash chains and from the probe array.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The provider's probes have been removed from the hash chains and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from the probe array. Now issue a dtrace_sync() to be sure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * everyone has cleared out from any probe array processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (probe = first; probe != NULL; probe = first) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync old->dtpv_pops.dtps_destroy(old->dtpv_arg, probe->dtpr_id,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(dtrace_arena, (void *)(uintptr_t)(probe->dtpr_id), 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(old->dtpv_next == NULL || dtrace_devi == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(old->dtpv_name, strlen(old->dtpv_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Invalidate the specified provider. All subsequent probe lookups for the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified provider will fail, but its probes will not be removed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (int (*)(void *, dtrace_id_t, void *))dtrace_enable_nullop);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Indicate whether or not DTrace has attached.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_provider will be non-NULL iff the DTrace driver has
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * attached. (It's non-NULL because DTrace is always itself a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * provider.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Remove all the unenabled probes for the given provider. This function is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not unlike dtrace_unregister(), except that it doesn't remove the provider
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * -- just as many of its associated probes as it can.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Make sure this isn't the dtrace provider itself.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (int (*)(void *, dtrace_id_t, void *))dtrace_enable_nullop);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Attempt to destroy the probes associated with this provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prov->dtpv_pops.dtps_destroy(prov->dtpv_arg, i + 1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(dtrace_arena, (void *)((uintptr_t)i + 1), 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Probe Management Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The functions in this section perform the DTrace probe management,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * including functions to create probes, look-up probes, and call into the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * providers to request that probes be provided. Some of these functions are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the Provider-to-Framework API; these functions can be identified by the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * fact that they are not declared "static".
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Create a probe with the specified module name, function name, and name.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_create(dtrace_provider_id_t prov, const char *mod,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync const char *func, const char *name, int aframes, void *arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_provider_t *provider = (dtrace_provider_t *)prov;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync id = (dtrace_id_t)(uintptr_t)vmem_alloc(dtrace_arena, 1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync probe = kmem_zalloc(sizeof (dtrace_probe_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size_t osize = dtrace_nprobes * sizeof (dtrace_probe_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * All CPUs are now seeing the new probes array; we can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * safely free the old array.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_lookup_match(dtrace_probe_t *probe, void *arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Look up a probe based on provider and one or more of module name, function
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * name and probe name.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_lookup(dtrace_provider_id_t prid, const char *mod,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkey.dtpk_prov = ((dtrace_provider_t *)prid)->dtpv_name;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkey.dtpk_mmatch = mod ? &dtrace_match_string : &dtrace_match_nul;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkey.dtpk_fmatch = func ? &dtrace_match_string : &dtrace_match_nul;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pkey.dtpk_nmatch = name ? &dtrace_match_string : &dtrace_match_nul;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Returns the probe argument associated with the specified probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_arg(dtrace_provider_id_t id, dtrace_id_t pid)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((probe = dtrace_probe_lookup_id(pid)) != NULL &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Copy a probe into a probe description.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_description(const dtrace_probe_t *prp, dtrace_probedesc_t *pdp)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prp->dtpr_provider->dtpv_name, DTRACE_PROVNAMELEN - 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(pdp->dtpd_mod, prp->dtpr_mod, DTRACE_MODNAMELEN - 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(pdp->dtpd_func, prp->dtpr_func, DTRACE_FUNCNAMELEN - 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(pdp->dtpd_name, prp->dtpr_name, DTRACE_NAMELEN - 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Called to indicate that a probe -- or probes -- should be provided by a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specfied provider. If the specified description is NULL, the provider will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be told to provide all of its probes. (This is done whenever a new
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * consumer comes along, or whenever a retained enabling is to be matched.) If
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the specified description is non-NULL, the provider is given the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * opportunity to dynamically provide the specified probe, allowing providers
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to support the creation of probes on-the-fly. (So-called _autocreated_
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes.) If the provider is NULL, the operations will be applied to all
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * providers; if the provider is non-NULL the operations will only be applied
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to the specified provider. The dtrace_provider_lock must be held, and the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_lock must _not_ be held -- the provider's dtps_provide() operation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * will need to grab the dtrace_lock when it reenters the framework through
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_probe_lookup(), dtrace_probe_create(), etc.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_provide(dtrace_probedesc_t *desc, dtrace_provider_t *prv)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, call the blanket provide operation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now call the per-module provide operation. We will grab
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * mod_lock to prevent the list from being modified. Note
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that this also prevents the mod_busy bits from changing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (mod_busy can only be changed with mod_lock held.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prv->dtpv_pops.dtps_provide_module(prv->dtpv_arg, ctl);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate over each probe, and call the Framework-to-Provider API function
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * denoted by offs.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We disable interrupts to walk through the probe array. This is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * safe -- the dtrace_sync() in dtrace_unregister() assures that we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * won't see stale data.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dtrace_nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This probe isn't enabled -- don't call the function.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_probe_enable(const dtrace_probedesc_t *desc, dtrace_enabling_t *enab)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we're passed a NULL description, we're being asked to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * create an ECB with a NULL probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_cred2priv(enab->dten_vstate->dtvs_state->dts_cred.dcr_cred,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (dtrace_match(&pkey, priv, uid, zoneid, dtrace_ecb_create_enable,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Helper Provider Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dofattr2attr(dtrace_attribute_t *attr, const dof_attr_t dofattr)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dofprov2hprov(dtrace_helper_provdesc_t *hprov,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync hprov->dthpv_provname = strtab + dofprov->dofpv_name;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_provider,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provide_one(dof_helper_t *dhp, dof_sec_t *sec, pid_t pid)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dof_sec_t *str_sec, *prb_sec, *arg_sec, *off_sec, *enoff_sec;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync str_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prb_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync arg_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync off_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync off = (uint32_t *)(uintptr_t)(daddr + off_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync arg = (uint8_t *)(uintptr_t)(daddr + arg_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See dtrace_helper_provider_validate().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync enoff_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync enoff = (uint32_t *)(uintptr_t)(daddr + enoff_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync nprobes = prb_sec->dofs_size / prb_sec->dofs_entsize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Create the provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((parg = mops->dtms_provide_pid(meta->dtm_arg, &dhpv, pid)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Create the probes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nprobes; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mops->dtms_create_probe(meta->dtm_arg, parg, &dhpb);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We may have just created probes, so we must now rematch against
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * any retained enablings. Note that this call will acquire both
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cpu_lock and dtrace_lock; the fact that we are holding
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_meta_lock now is what defines the ordering with respect to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * these three locks.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_remove_one(dof_helper_t *dhp, dof_sec_t *sec, pid_t pid)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync str_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Create the provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_remove(dof_helper_t *dhp, pid_t pid)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Meta Provider-to-Framework API Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * These functions implement the Meta Provider-to-Framework API, as described
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_meta_register(const char *name, const dtrace_mops_t *mops, void *arg,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We strictly don't need the name, but we hold onto it for
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * debuggability. All hail error queues!
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register meta-provider: "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "invalid name");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register meta-register %s: "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync meta = kmem_zalloc(sizeof (dtrace_meta_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync meta->dtm_name = kmem_alloc(strlen(name) + 1, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to register meta-register %s: "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(meta->dtm_name, strlen(meta->dtm_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there are providers and probes ready to go, pass them
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * off to the new meta provider now.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helper_provide(&help->dthps_provs[i]->dthp_prov,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_meta_unregister(dtrace_meta_provider_id_t id)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(old->dtm_name, strlen(old->dtm_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace DIF Object Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) uprintf("dtrace DIF object error: [%u]: ", pc);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Validate a DTrace DIF object by checking the IR instructions. The following
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * rules are currently enforced by dtrace_difo_validate():
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 1. Each instruction must have a valid opcode
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 2. Each register, string, variable, or subroutine reference must be valid
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 3. No instruction can modify register %r0 (must be zero)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 4. All instruction reserved bits must be set to zero
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 5. The last instruction must be a "ret" instruction
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 6. All branch targets must reference a valid instruction _after_ the branch
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_validate(dtrace_difo_t *dp, dtrace_vstate_t *vstate, uint_t nregs,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int (*efunc)(uint_t pc, const char *, ...) = dtrace_difo_err;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (vstate->dtvs_state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL) == 0;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (pc = 0; pc < dp->dtdo_len && err == 0; pc++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (v < DIF_VAR_OTHER_MIN || v > DIF_VAR_OTHER_MAX)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (v < DIF_VAR_OTHER_UBASE || v > DIF_VAR_OTHER_MAX)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (type != DIF_TYPE_STRING && type != DIF_TYPE_CTF)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DIF_INSTR_OP(dp->dtdo_buf[dp->dtdo_len - 1]) != DIF_OP_RET) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "expected 'ret' as last DIF instruction\n");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we're not returning by reference, the size must be either
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 0 or the size of one of the base types.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint8_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint16_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint32_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync case sizeof (uint64_t):
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(dp->dtdo_len - 1, "bad return size\n");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < dp->dtdo_varlen && err == 0; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_difv_t *v = &dp->dtdo_vartab[i], *existing = NULL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(i, "unrecognized variable scope %d\n",
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(i, "%d exceeds variable id limit\n", id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For user-defined variables, we need to check that this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * definition is identical to any previous definition that we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * encountered.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync switch (v->dtdv_scope) {
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (VBDTCAST(int64_t)ndx < vstate->dtvs_nglobals) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(i, "%d changed variable type flags\n", id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (vt->dtdt_size != 0 && vt->dtdt_size != et->dtdt_size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(i, "%d changed variable type size\n", id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Validate a DTrace DIF object that it is to be used as a helper. Helpers
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are much more constrained than normal DIFOs. Specifically, they may
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 1. Make calls to subroutines other than copyin(), copyinstr() or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * miscellaneous string routines
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 2. Access DTrace variables other than the args[] array, and the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * curthread, pid, ppid, tid, execname, zonename, uid and gid variables.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 3. Have thread-local variables.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * 4. Have dynamic variables.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int (*efunc)(uint_t pc, const char *, ...) = dtrace_difo_err;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(pc, "illegal dynamic variable load\n");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += efunc(pc, "illegal dynamic variable store\n");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Returns 1 if the expression in the DIF object can be cached on a per-thread
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * basis; 0 if not.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync switch (v->dtdv_id) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This DIF object may be cacheable. Now we need to look for any
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * array loading instructions, any memory loading instructions, or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * any stores to thread-local variables.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to check this DIF object for references to the variable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DIF_VAR_VTIMESTAMP.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This routine calculates the dynamic variable chunksize for a given DIF
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * object. The calculation is not fool-proof, and can probably be tricked by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * malicious DIF -- but it works for all compiler-generated DIF. Because this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * calculation is likely imperfect, dtrace_dynvar() is able to gracefully fail
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * if a dynamic variable size exceeds the chunksize.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_chunksize(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_key_t tupregs[DIF_DTR_NREGS + 2]; /* +2 for thread and id */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((srd == 0 || sval == 0) && r1 == DIF_TYPE_STRING) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the register for the size of the "pushtr"
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is %r0 (or the value is 0) and the type is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a string, we'll use the system-wide default
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * string size.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have a dynamic variable allocation; calculate its size.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ksize += P2ROUNDUP(key[i].dttk_size, sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we need to determine the size of the stored data.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have the size. If this is larger than the chunk size
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for our dynamic variable state, reset the chunk size.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_init(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync while (VBDTCAST(int64_t)id >= (otlocals = vstate->dtvs_ntlocals)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (osz != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync svar = kmem_zalloc(sizeof (dtrace_statvar_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_duplicate(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync new = kmem_zalloc(sizeof (dtrace_difo_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync new->dtdo_strtab = kmem_alloc(dp->dtdo_strlen, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy(dp->dtdo_strtab, new->dtdo_strtab, dp->dtdo_strlen);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_destroy(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_buf, dp->dtdo_len * sizeof (dif_instr_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_inttab, dp->dtdo_intlen * sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_vartab, dp->dtdo_varlen * sizeof (dtrace_difv_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_difo_release(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Format Functions
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync uint16_t ndx, len = VBDTCAST(uint16_t)strlen(str) + 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is only likely if a denial-of-service attack is being
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * attempted. As such, it's okay to fail silently here.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For simplicity, we always resize the formats array to be exactly the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * number of formats.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync new = kmem_alloc((ndx + 1) * sizeof (char *), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy(state->dts_formats, new, ndx * sizeof (char *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(state->dts_formats, ndx * sizeof (char *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_format_remove(dtrace_state_t *state, uint16_t format)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(state->dts_formats, state->dts_nformats * sizeof (char *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Predicate Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync pred = kmem_zalloc(sizeof (dtrace_predicate_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is only theoretically possible -- we have had 2^32
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cacheable predicates on this machine. We cannot allow any
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * more predicates to become cacheable: as unlikely as it is,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * there may be a thread caching a (now stale) predicate cache
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * ID. (N.B.: the temptation is being successfully resisted to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have this cmn_err() "Holy shit -- we executed this code!")
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(pred->dtp_difo != NULL && pred->dtp_difo->dtdo_refcnt != 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_predicate_release(dtrace_predicate_t *pred, dtrace_vstate_t *vstate)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Action Description Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_actdesc_create(dtrace_actkind_t kind, uint32_t ntuple,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(!DTRACEACT_ISPRINTFLIKE(kind) || (arg != NULL &&
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync VBDT_IS_VALID_KRNL_ADDR(arg)) || (arg == NULL && kind == DTRACEACT_PRINTA));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync act = kmem_zalloc(sizeof (dtrace_actdesc_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_actdesc_release(dtrace_actdesc_t *act, dtrace_vstate_t *vstate)
b4a8e740be59b3b81060dba76633c34865920ad4vboxsync ASSERT((str != NULL && VBDT_IS_VALID_KRNL_ADDR((uintptr_t)str)) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (str == NULL && act->dtad_kind == DTRACEACT_PRINTA));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace ECB Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_add(dtrace_state_t *state, dtrace_probe_t *probe)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb = kmem_zalloc(sizeof (dtrace_ecb_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The default size is the size of the default action: recording
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the epid.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb->dte_size = ecb->dte_needed = sizeof (dtrace_epid_t);
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (VBDTCAST(int64_t)epid - 1 >= state->dts_necbs) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync ASSERT(epid == VBDTCAST(dtrace_epid_t)state->dts_necbs + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecbs = kmem_zalloc(necbs * sizeof (*ecbs), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy(oecbs, ecbs, state->dts_necbs * sizeof (*ecbs));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this state is active, we must dtrace_sync()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * before we can free the old dts_ecbs array: we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * coming in hot, and there may be active ring
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer processing (which indexes into the dts_ecbs
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * array) on another CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(oecbs, state->dts_necbs * sizeof (*ecbs));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the NULL probe -- there's nothing to do.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're the first ECB on this probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync probe->dtpr_predcache = ecb->dte_predicate->dtp_cacheid;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (prov->dtpv_pops.dtps_enable(prov->dtpv_arg,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This probe is already active. Swing the last pointer to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * point to the new ECB, and issue a dtrace_sync() to assure
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that all CPUs have seen the change.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we record anything, we always record the epid. (And we always
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * record it first.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb->dte_size = ecb->dte_needed = sizeof (dtrace_epid_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the first record in a tuple. Align the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * offset to be at offset 4 in an 8-byte aligned
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (rec->dtrd_size != 0 && (diff = (offs & (align - 1)))) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The current offset is not properly aligned; align it.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_aggregation_t *agg = (dtrace_aggregation_t *)act;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync !(act->dta_kind == DTRACEACT_SPECULATE && act->dta_next == NULL) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the size is still sizeof (dtrace_epid_t), then all
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * actions store no data; set the size to 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the needed space is still sizeof (dtrace_epid_t), then
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * all actions need no additional space; set the needed
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size to 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set our alignment, and make sure that the dte_size and dte_needed
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are aligned to the size of an EPID.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb->dte_size = (ecb->dte_size + (sizeof (dtrace_epid_t) - 1)) &
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb->dte_needed = (ecb->dte_needed + (sizeof (dtrace_epid_t) - 1)) &
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_aggregation_create(dtrace_ecb_t *ecb, dtrace_actdesc_t *desc)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync agg = kmem_zalloc(sizeof (dtrace_aggregation_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size = (((sizeof (uint64_t) * NBBY) - 1) * 2 + 1) *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint16_t step = DTRACE_LQUANTIZE_STEP(desc->dtad_arg);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uint16_t levels = DTRACE_LQUANTIZE_LEVELS(desc->dtad_arg);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size = levels * sizeof (uint64_t) + 3 * sizeof (uint64_t);
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync agg->dtag_action.dta_rec.dtrd_size = VBDTCAST(uint32_t)size;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We must make sure that we have enough actions for the n-tuple.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action_last; act != NULL; act = act->dta_prev) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (--ntuple == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the action with which our n-tuple begins.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This n-tuple is short by ntuple elements. Return failure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the last action in the tuple has a size of zero, it's actually
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * an expression argument for the aggregating action.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to allocate an id for this aggregation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync aggid = (dtrace_aggid_t)(uintptr_t)vmem_alloc(state->dts_aggid_arena, 1,
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (VBDTCAST(int64_t)aggid - 1 >= state->dts_naggregations) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_aggregation_t **oaggs = state->dts_aggregations;
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync ASSERT(aggid == VBDTCAST(dtrace_aggid_t)state->dts_naggregations + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync aggs = kmem_zalloc(naggs * sizeof (*aggs), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_aggregations[aggid - 1] == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_aggregations[(agg->dtag_id = aggid) - 1] = agg;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (frec->dtrd_alignment < sizeof (dtrace_aggid_t))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = agg->dtag_first; act != NULL; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_aggregation_destroy(dtrace_ecb_t *ecb, dtrace_action_t *act)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_aggregation_t *agg = (dtrace_aggregation_t *)act;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(state->dts_aggid_arena, (void *)(uintptr_t)aggid, 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_action_add(dtrace_ecb_t *ecb, dtrace_actdesc_t *desc)
e3c0207b236896a903ef328bfa74ee97e61bd38bvboxsync dtrace_optval_t *opt = state->dts_options, nframes VBDTUNASS(0), strsize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(ecb->dte_action == NULL || ecb->dte_action->dta_refcnt == 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is an aggregating action, there must be neither
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a speculate nor a commit on the action chain.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We know that our arg is a string -- turn it into a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync size = VBDTCAST(uint32_t)(nframes * sizeof (pc_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Save a slot for the pid.
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync size = VBDTCAST(uint32_t)((nframes + 1) * sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size = P2ROUNDUP(size, (uint32_t)(sizeof (uintptr_t)));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dp == NULL || ((size = dp->dtdo_rtype.dtdt_size) !=
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sizeof (uint64_t)) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have a slot for the pid, plus a slot for the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * argument. To keep things simple (aligned with
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * bitness-neutral sizing), we store each as a 64-bit
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * quantity.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (size = dp->dtdo_rtype.dtdt_size) != sizeof (int) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (size != 0 || desc->dtad_kind == DTRACEACT_SPECULATE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is a data-storing action or a speculate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we must be sure that there isn't a commit on the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * action chain.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync action = kmem_zalloc(sizeof (dtrace_action_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (mask = sizeof (uint64_t) - 1; size != 0 && mask > 0; mask >>= 1) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_vstate_t *vstate = &ecb->dte_state->dts_vstate;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(act->dta_next == NULL || act->dta_next->dta_refcnt == 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(next != NULL || act == ecb->dte_action_last);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We disable the ECB by removing it from its probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is the NULL probe; there is nothing to disable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (pecb = probe->dtpr_ecb; pecb != NULL; pecb = pecb->dte_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The ECB has been disconnected from the probe; now sync to assure
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that all CPUs have seen the change before returning.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * That was the last ECB on the probe; clear the predicate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cache ID for the probe, disable it and sync one more time
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to assure that we'll never hit it again.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There is at least one ECB remaining on the probe. If there
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is _exactly_ one, set the probe's predicate cache ID to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the predicate cache ID of the remaining ECB.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(probe->dtpr_predcache == DTRACE_CACHEIDNONE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_predicate_t *p = probe->dtpr_ecb->dte_predicate;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(ecb->dte_probe == NULL || ecb->dte_probe->dtpr_ecb != ecb);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_create(dtrace_state_t *state, dtrace_probe_t *probe,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pred = desc->dted_pred.dtpdd_predicate) != NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the provider shows more leg than the consumer is old
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enough to see, we need to enable the appropriate implicit
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * predicate bits to prevent the ecb from activating at
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * revealing times.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Providers specifying DTRACE_PRIV_USER at register time
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are stating that they need the /proc-style privilege
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * model to be enforced, and this is what DTRACE_COND_OWNER
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and DTRACE_COND_ZONEOWNER will then do at probe time.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(state->dts_cred.dcr_visible & DTRACE_CRV_ALLPROC) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(state->dts_cred.dcr_visible & DTRACE_CRV_ALLZONE) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the provider shows us kernel innards and the user
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is lacking sufficient privilege, enable the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTRACE_COND_USERMODE implicit predicate.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL) &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have a cached ecb, we'll use its action list instead
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of creating our own (saving both time and space).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = desc->dted_action; act != NULL; act = act->dtad_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((enab->dten_error = dtrace_ecb_action_add(ecb, act)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ecb_create_enable(dtrace_probe_t *probe, void *arg)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_state_t *state = enab->dten_vstate->dtvs_state;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (probe != NULL && probe->dtpr_gen < enab->dten_probegen) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This probe was created in a generation for which this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling has previously created ECBs; we don't want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enable it again, so just kick out.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((ecb = dtrace_ecb_create(state, probe, enab)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_epid2ecb(dtrace_state_t *state, dtrace_epid_t id)
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (id == 0 || VBDTCAST(int64_t)id > state->dts_necbs)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_necbs > 0 && state->dts_ecbs != NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT((ecb = state->dts_ecbs[id - 1]) == NULL || ecb->dte_epid == id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_aggid2agg(dtrace_state_t *state, dtrace_aggid_t id)
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (id == 0 || VBDTCAST(int64_t)id > state->dts_naggregations)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_naggregations > 0 && state->dts_aggregations != NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT((agg = state->dts_aggregations[id - 1]) == NULL ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Buffer Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The following functions manipulate DTrace buffers. Most of these functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are called in the context of establishing or processing consumer state;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * exceptions are explicitly noted.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: called from cross call context. This function switches the two
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffers on a given CPU. The atomicity of this operation is assured by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * disabling interrupts while the actual switch takes place; the disabling of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interrupts serializes the execution with any execution of dtrace_probe() on
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the same CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync buf->dtb_flags &= ~(DTRACEBUF_ERROR | DTRACEBUF_DROPPED);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncstatic DECLCALLBACK(void) dtrace_buffer_switch_wrapper(RTCPUID idCpu, void *pvUser1, void *pvUser2)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: called from cross call context. This function activates a buffer
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * on a CPU. As with dtrace_buffer_switch(), the atomicity of the operation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is guaranteed by the disabling of interrupts.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_icookie_t cookie = dtrace_interrupt_disable();
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We might like to assert that the buffer is marked inactive,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * but this isn't necessarily true: the buffer for the CPU
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that processes the BEGIN probe has its buffer activated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * manually. In this case, we take the (harmless) action
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * re-clearing the bit INACTIVE bit.
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncstatic DECLCALLBACK(void) dtrace_buffer_activate_wrapper(RTCPUID idCpu, void *pvUser1, void *pvUser2)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_buffer_alloc(dtrace_buffer_t *bufs, size_t size, int flags,
0e4c43c4bb9b53b56189cd3f0d743508abdbd442vboxsync || (cpu != (processorid_t)DTRACE_CPUALL && cpu != iCpu))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there is already a buffer allocated for this CPU, it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is only possible that this is a DR event. In this case,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the buffer size must match our specified size.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((buf->dtb_tomax = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((buf->dtb_xamot = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync || (cpu != (processorid_t)DTRACE_CPUALL && cpu != iCpu))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: called from probe context. This function just increments the drop
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * count on a buffer. It has been made a function to allow for the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * possibility of understanding the source of mysterious drop counts. (A
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * problem for which one may be particularly disappointed that DTrace cannot
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be used to understand DTrace.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Note: called from probe context. This function is called to reserve space
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in a buffer. If mstate is non-NULL, sets the scratch base and size in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * mstate. Returns the new offset in the buffer, or a negative value if an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * error has occurred.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_buffer_reserve(dtrace_buffer_t *buf, size_t needed, size_t align,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!(buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL))) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Assert that our alignment is off by a number which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is itself sizeof (uint32_t) aligned.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACE_STORE(uint32_t, tomax, offs, DTRACE_EPIDNONE);
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync if (VBDTCAST(uintptr_t)(soffs = offs + needed) > buf->dtb_size) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_scratch_base = (uintptr_t)tomax + soffs;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_scratch_ptr = mstate->dtms_scratch_base;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_COOLDOWN &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For a ring buffer, life is quite a bit more complicated. Before
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we can store any padding, we need to adjust our wrapping offset.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (If we've never before wrapped or we're not about to, no adjustment
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is required.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We can't fit in the end of the buffer. First, a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sanity check that we can fit in the buffer at all.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're going to be storing at the top of the buffer,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * so now we need to deal with the wrapped offset. We
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * only reset our wrapped offset to 0 if it is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * currently greater than the current offset. If it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is less than the current offset, it is because a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * previous allocation induced a wrap -- but the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allocation didn't subsequently take the space due
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to an error or false predicate evaluation. In this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * case, we'll just leave the wrapped offset alone: if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the wrapped offset hasn't been advanced far enough
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for this allocation, it will be adjusted in the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * lower loop.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we know that we're going to be storing to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * top of the buffer and that there is room for us
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * there. We need to clear the buffer from the current
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * offset to the end (there may be old gunk there).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to set our offset to zero. And because we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are wrapping, we need to set the bit indicating as
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * much. We can also adjust our needed space back
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * down to the space required by the ECB -- we know
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that the top of the buffer is aligned.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There is room for us in the buffer, so we simply
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * need to check the wrapped offset.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The wrapped offset is less than the offset.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This can happen if we allocated buffer space
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that induced a wrap, but then we didn't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * subsequently take the space due to an error
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or false predicate evaluation. This is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * okay; we know that _this_ allocation isn't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * going to induce a wrap. We still can't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * reset the wrapped offset to be zero,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * however: the space may have been trashed in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the previous failed probe attempt. But at
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * least the wrapped offset doesn't need to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be adjusted at all...
662add0e7ef75c9c2131b38a6b9fe354d2b15266vboxsync while (VBDTCAST(uintptr_t)offs + total > VBDTCAST(uintptr_t)woffs) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We've reached the end of the buffer; we want
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to set the wrapped offset to 0 and break
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * out. However, if the offs is 0, then we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in a strange edge-condition: the amount of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * space that we want to reserve plus the size
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of the record that we're overwriting is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * greater than the size of the buffer. This
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is problematic because if we reserve the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * space but subsequently don't consume it (due
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to a failed predicate or error) the wrapped
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * offset will be 0 -- yet the EPID at offset 0
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * will not be committed. This situation is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * relatively easy to deal with: if we're in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this case, the buffer is indistinguishable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from one that hasn't wrapped; we need only
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * finish the job by clearing the wrapped bit,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * explicitly setting the offset to be 0, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * zero'ing out the old data in the buffer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (offs == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have a wrapped offset. It may be that the wrapped offset
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * has become zero -- that's okay.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we can plow the buffer with any necessary padding.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Assert that our alignment is off by a number which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is itself sizeof (uint32_t) aligned.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACE_STORE(uint32_t, tomax, offs, DTRACE_EPIDNONE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (offs + needed > buf->dtb_size - state->dts_reserve) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For ring buffers and fill buffers, the scratch space is always
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the inactive buffer.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_scratch_base = (uintptr_t)buf->dtb_xamot;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync mstate->dtms_scratch_ptr = mstate->dtms_scratch_base;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We need to polish the ring buffer. There are three cases:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - The first (and presumably most common) is that there is no gap
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * between the buffer offset and the wrapped offset. In this case,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * there is nothing in the buffer that isn't valid data; we can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * mark the buffer as polished and return.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - The second (less common than the first but still more common
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * than the third) is that there is a gap between the buffer offset
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and the wrapped offset, and the wrapped offset is larger than the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer offset. This can happen because of an alignment issue, or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * can happen because of a call to dtrace_buffer_reserve() that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * didn't subsequently consume the buffer space. In this case,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we need to zero the data from the buffer offset to the wrapped
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * - The third (and least common) is that there is a gap between the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer offset and the wrapped offset, but the wrapped offset is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * _less_ than the buffer offset. This can only happen because a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * call to dtrace_buffer_reserve() induced a wrap, but the space
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * was not subsequently consumed. In this case, we need to zero the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * space from the offset to the end of the buffer _and_ from the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * top of the buffer to the wrapped offset.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < NCPU; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Enabling Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync enab = kmem_zalloc(sizeof (dtrace_enabling_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_enabling_add(dtrace_enabling_t *enab, dtrace_ecbdesc_t *ecb)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We can't add to enablings after we've enabled them, or after we've
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * retained them.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(enab->dten_next == NULL && enab->dten_prev == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync osize = enab->dten_maxdesc * sizeof (dtrace_enabling_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync nsize = enab->dten_maxdesc * sizeof (dtrace_enabling_t *);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_enabling_addlike(dtrace_enabling_t *enab, dtrace_ecbdesc_t *ecb,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're going to create a new ECB description that matches the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified ECB in every way, but has the specified probe description.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync new = kmem_zalloc(sizeof (dtrace_ecbdesc_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pred = ecb->dted_pred.dtpdd_predicate) != NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dted_action; act != NULL; act = act->dtad_next)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probedesc_t *desc = &enab->dten_desc[i]->dted_probe;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_NOTE, "enabling probe %d (%s:%s:%s:%s)", i,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pred = ep->dted_pred.dtpdd_predicate) != NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ep->dted_action; act != NULL; act = next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync enab->dten_maxdesc * sizeof (dtrace_enabling_t *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this was a retained enabling, decrement the dts_nretained count
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and take it off of the dtrace_retained list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (enab->dten_prev != NULL || enab->dten_next != NULL ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(enab->dten_vstate->dtvs_state->dts_nretained > 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(enab->dten_next == NULL && enab->dten_prev == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We only allow each state to retain dtrace_retain_max enablings.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_enabling_replicate(dtrace_state_t *state, dtrace_probedesc_t *match,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(strlen(match->dtpd_provider) < DTRACE_PROVNAMELEN);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(strlen(match->dtpd_mod) < DTRACE_MODNAMELEN);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(strlen(match->dtpd_func) < DTRACE_FUNCNAMELEN);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate over all retained enablings, looking for enablings that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * match the specified state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtvs_state can only be NULL for helper enablings -- and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * helper enablings can't be retained.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now iterate over each probe description; we're looking for
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * an exact match to the specified probe description.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (strcmp(pd->dtpd_provider, match->dtpd_provider))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have a winning probe! Add it to our growing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!found || (err = dtrace_enabling_retain(new)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate over all retained enablings, destroy the enablings retained
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for the specified state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (enab = dtrace_retained; enab != NULL; enab = next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtvs_state can only be NULL for helper enablings -- and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * helper enablings can't be retained.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_enabling_match(dtrace_enabling_t *enab, int *nmatched)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If a provider failed to enable a probe then get out and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * let the consumer know we failed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((matched = dtrace_probe_enable(&ep->dted_probe, enab)) < 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we get an error half-way through enabling the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes, we kick out -- perhaps with some number of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * them enabled. Leaving enabled probes enabled may
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be slightly confusing for user-level, but we expect
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that no one will attempt to actually drive on in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the face of such errors. If this is an anonymous
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling (indicated with a NULL nmatched pointer),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we cmn_err() a message. We aren't expecting to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * get such an error -- such as it can exist at all,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it would be a result of corrupted DOF in the driver
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * properties.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate over all retained enablings to see if any probes match
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * against them. We only perform this operation on enablings for which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we have sufficient permissions by virtue of being in the global zone
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * or in the same zone as the DTrace client. Because we can be called
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * after dtrace_detach() has been called, we cannot assert that there
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are retained enablings. We can safely load from dtrace_retained,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * however: the taskq_destroy() at the end of dtrace_detach() will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * block pending our completion.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cred_t *cr = enab->dten_vstate->dtvs_state->dts_cred.dcr_cred;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If an enabling is to be enabled without having matched probes (that is, if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_state_go() is to be called on the underlying dtrace_state_t), the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling must be _primed_ by creating an ECB for every ECB description.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This must be done to assure that we know the number of speculations, the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * number of aggregations, the minimum buffer size needed, etc. before we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * transition out of DTRACE_ACTIVITY_INACTIVE. To do this without actually
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling any probes, we create ECBs for every ECB decription, but with a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * NULL probe -- which is exactly what this function does.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We don't want to prime an enabling more than once, lest
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we allow a malicious user to induce resource exhaustion.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (The ECBs that result from priming an enabling aren't
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * leaked -- but they also aren't deallocated until the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * consumer state is destroyed.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Called to indicate that probes should be provided due to retained
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enablings. This is implemented in terms of dtrace_probe_provide(), but it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * must take an initial lap through the enabling calling the dtps_provide()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * entry point explicitly to allow for autocreated probes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Process the retained enablings again if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * they have changed while we weren't holding
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_lock.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace DOF Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "failed to process DOF: %s", str);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Create DOF out of a currently enabled state. Right now, we only create
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DOF containing the run-time options -- but this could be expanded to create
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * complete DOF representing the enabled state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dof->dofh_ident[DOF_ID_ENCODING] = DOF_ENCODE_NATIVE;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Fill in the option section header...
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sec = (dof_sec_t *)((uintptr_t)dof + sizeof (dof_hdr_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sec->dofs_offset = (uintptr_t)opt - (uintptr_t)dof;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sec->dofs_size = sizeof (dof_optdesc_t) * DTRACEOPT_MAX;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < DTRACEOPT_MAX; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, we're going to copyin() the sizeof (dof_hdr_t).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)uarg, &hdr, sizeof (hdr)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(NULL, "failed to copyin DOF header");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we'll allocate the entire DOF and copy it in -- provided
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that the length isn't outrageous.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (hdr.dofh_loadsz >= VBDTCAST(uint64_t)dtrace_dof_maxsize) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(&hdr, "load size exceeds maximum");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)uarg, dof, hdr.dofh_loadsz) != 0 ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Unfortunately, array of values in .conf files are always (and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * only) interpreted to be integer arrays. We must read our DOF
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * as an integer array, and then squeeze it into a byte array.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dtrace_devi, 0,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (char *)name, (int **)&buf, &len) != DDI_PROP_SUCCESS)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < len; i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (len < (loadsz = ((dof_hdr_t *)buf)->dofh_loadsz)) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#else /* VBOX */
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#endif /* VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Return the dof_sec_t pointer corresponding to a given section index. If the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * index is not valid, dtrace_dof_error() is called and NULL is returned. If
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a type other than DOF_SECT_NONE is specified, the header is checked against
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this type and NULL is returned if the types do not match.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_sect(dof_hdr_t *dof, uint32_t type, dof_secidx_t i)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((uintptr_t)dof + dof->dofh_secoff + i * dof->dofh_secsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "referenced section index is invalid");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "referenced section is not loadable");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (type != DOF_SECT_NONE && type != sec->dofs_type) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "referenced section is the wrong type");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_probedesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_probedesc_t *desc)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "bad alignment in probe description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sec->dofs_offset + sizeof (dof_probedesc_t) > dof->dofh_loadsz) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "truncated probe description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync probe = (dof_probedesc_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strtab = dtrace_dof_sect(dof, DOF_SECT_STRTAB, probe->dofp_strtab);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync MIN(DTRACE_PROVNAMELEN - 1, size - probe->dofp_provider));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(desc->dtpd_mod, (char *)(str + probe->dofp_mod),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync MIN(DTRACE_MODNAMELEN - 1, size - probe->dofp_mod));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(desc->dtpd_func, (char *)(str + probe->dofp_func),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync MIN(DTRACE_FUNCNAMELEN - 1, size - probe->dofp_func));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) strncpy(desc->dtpd_name, (char *)(str + probe->dofp_name),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_difo(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int i, l, n;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync static const struct {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync offsetof(dtrace_difo_t, dtdo_len), sizeof (dif_instr_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync { DOF_SECT_INTTAB, offsetof(dtrace_difo_t, dtdo_inttab),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync offsetof(dtrace_difo_t, dtdo_intlen), sizeof (uint64_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync { DOF_SECT_STRTAB, offsetof(dtrace_difo_t, dtdo_strtab),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sizeof (char), "multiple string tables" },
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync { DOF_SECT_VARTAB, offsetof(dtrace_difo_t, dtdo_vartab),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync offsetof(dtrace_difo_t, dtdo_varlen), sizeof (dtrace_difv_t),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "invalid DIFO header section");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "bad alignment in DIFO header");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dofd = (dof_difohdr_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync n = (sec->dofs_size - sizeof (*dofd)) / sizeof (dof_secidx_t) + 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dp = kmem_zalloc(sizeof (dtrace_difo_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (l = 0; l < n; l++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; difo[i].section != DOF_SECT_NONE; i++) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (subsec->dofs_type != VBDTCAST(uint32_t)difo[i].section)
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (subsec->dofs_align != VBDTCAST(uint32_t)difo[i].align) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync lenp = (uint32_t *)((uintptr_t)dp + difo[i].lenoffs);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (VBDTCAST(uint32_t)difo[i].entsize != subsec->dofs_entsize) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy((char *)(uintptr_t)(daddr + subsec->dofs_offset),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we encounter a loadable DIFO sub-section that is not
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * known to us, assume this is a broken program and fail.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "unrecognized DIFO subsection");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We can't have a DIF object without DIF text.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we validate the DIF object, run through the variable table
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * looking for the strings -- if any of their size are under, we'll set
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * their size to be the system-wide default string size. Note that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this should _not_ happen if the "strsize" option has been set --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in this case, the compiler should have set the size to reflect the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * setting of the option.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = 0; VBDTCAST(unsigned)i < dp->dtdo_varlen; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (t->dtdt_kind == DIF_TYPE_STRING && t->dtdt_size == 0)
34812c4f416dad7cfa197fea648d04d7c95e63d2vboxsync t->dtdt_size = VBDTCAST(uint32_t)dtrace_strsize_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_difo_validate(dp, vstate, DIF_DIR_NREGS, cr) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_buf, dp->dtdo_len * sizeof (dif_instr_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_inttab, dp->dtdo_intlen * sizeof (uint64_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dp->dtdo_vartab, dp->dtdo_varlen * sizeof (dtrace_difv_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_predicate(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((dp = dtrace_dof_difo(dof, sec, vstate, cr)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_actdesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_actdesc_t *act, *first = NULL, *last = NULL, *next;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sec->dofs_offset + sizeof (dof_actdesc_t) > dof->dofh_loadsz) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "truncated action description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "bad alignment in action description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "section entry size exceeds total size");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "bad entry size in action description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sec->dofs_size / sec->dofs_entsize > dtrace_actions_max) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "actions exceed dtrace_actions_max");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (offs = 0; offs < sec->dofs_size; offs += sec->dofs_entsize) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * printf()-like actions must have a format string.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = desc->dofa_arg; i < strtab->dofs_size; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync act = dtrace_actdesc_create(kind, desc->dofa_ntuple,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync act->dtad_difo = dtrace_dof_difo(dof, difosec, vstate, cr);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_ecbdesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "truncated ECB description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "bad alignment in ECB description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ecb = (dof_ecbdesc_t *)((uintptr_t)dof + (uintptr_t)sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sec = dtrace_dof_sect(dof, DOF_SECT_PROBEDESC, ecb->dofe_probes);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ep = kmem_zalloc(sizeof (dtrace_ecbdesc_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pred = dtrace_dof_predicate(dof, sec, vstate, cr)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ep->dted_action = dtrace_dof_actdesc(dof, sec, vstate, cr);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Apply the relocations from the specified 'sec' (a DOF_SECT_URELHDR) to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specified DOF. At present, this amounts to simply adding 'ubase' to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * site of any user SETX relocations to account for load object base address.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * In the future, if we need other relocations, this function can be extended.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_relocate(dof_hdr_t *dof, dof_sec_t *sec, uint64_t ubase)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (dof_relohdr_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "invalid relocation header");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ss = dtrace_dof_sect(dof, DOF_SECT_STRTAB, dofr->dofr_strtab);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rs = dtrace_dof_sect(dof, DOF_SECT_RELTAB, dofr->dofr_relsec);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ts = dtrace_dof_sect(dof, DOF_SECT_NONE, dofr->dofr_tgtsec);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1); /* dtrace_dof_error() has been called already */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "invalid relocation section");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync r = (dof_relodesc_t *)(uintptr_t)(daddr + rs->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < n; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync uintptr_t taddr = daddr + ts->dofs_offset + r->dofr_offset;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync switch (r->dofr_type) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (r->dofr_offset >= ts->dofs_size || r->dofr_offset +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync r = (dof_relodesc_t *)((uintptr_t)r + rs->dofs_entsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The dof_hdr_t passed to dtrace_dof_slurp() should be a partially validated
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * header: it should be at the front of a memory region that is at least
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sizeof (dof_hdr_t) in size -- and then at least dof_hdr.dofh_loadsz in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * size. It need not be validated in any other way.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_slurp(dof_hdr_t *dof, dtrace_vstate_t *vstate, cred_t *cr,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_enabling_t **enabp, uint64_t ubase, int noprobes)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check the DOF header identification bytes. In addition to checking
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * valid settings, we also verify that unused bits/bytes are zeroed so
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we can use them later without fear of regressing existing binaries.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF magic string mismatch");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_MODEL] != DOF_MODEL_ILP32 &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF has invalid data model");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_ENCODING] != DOF_ENCODE_NATIVE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_2) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_DIFVERS] != DIF_VERSION_2) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF uses unsupported instruction set");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_DIFIREG] > DIF_DIR_NREGS) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF uses too many integer registers");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_DIFTREG] > DIF_DTR_NREGS) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF uses too many tuple registers");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF has invalid ident byte set");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "DOF has invalid flag bits set");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check that the section headers don't exceed the amount of DOF
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * data. Note that we cast the section size and number of sections
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to uint64_t's to prevent possible overflow in the multiplication.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync seclen = (uint64_t)dof->dofh_secnum * (uint64_t)dof->dofh_secsize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "truncated section headers");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!IS_P2ALIGNED(dof->dofh_secoff, sizeof (uint64_t))) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "misaligned section headers");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!IS_P2ALIGNED(dof->dofh_secsize, sizeof (uint64_t))) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Take an initial pass through the section headers to be sure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the headers don't have stray offsets. If the 'noprobes' flag is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * set, do not permit sections relating to providers, probes, or args.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "for enabling");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "loadable section with load "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "flag unset");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync continue; /* just ignore non-loadable sections */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sec->dofs_offset > len || sec->dofs_size > len ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (sec->dofs_type == DOF_SECT_STRTAB && *((char *)daddr +
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "non-terminating string table");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Take a second pass through the sections and locate and perform any
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * relocations that are present. We do this after the first pass to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be sure that all sections have had their headers validated.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync continue; /* skip sections that are not loadable */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((ep = dtrace_dof_ecbdesc(dof, sec, vstate, cr)) == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Process DOF for any options. This routine assumes that the DOF has been
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * at least processed by dtrace_dof_slurp().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dof_options(dof_hdr_t *dof, dtrace_state_t *state)
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = 0; VBDTCAST(unsigned)i < dof->dofh_secnum; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "option description");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (offs = 0; offs < sec->dofs_size; offs += entsize) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (desc->dofo_value == VBDTCAST(uint64_t)DTRACEOPT_UNSET) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Consumer State Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_dstate_init(dtrace_dstate_t *dstate, size_t size)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size_t hashsize, maxper, min, chunksize = dstate->dtds_chunksize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(dstate->dtds_base == NULL && dstate->dtds_percpu == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (size < (min = dstate->dtds_chunksize + sizeof (dtrace_dynhash_t)))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((base = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dstate->dtds_percpu = kmem_cache_alloc(dtrace_state_cache, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bzero(dstate->dtds_percpu, NCPU * sizeof (dtrace_dstate_percpu_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync hashsize = size / (dstate->dtds_chunksize + sizeof (dtrace_dynhash_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set all of our hash buckets to point to the single sink, and (if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it hasn't already been set), set the sink's hash value to be the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * sink sentinel value. The sink is needed for dynamic variable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * lookups to know that they have iterated over an entire, valid hash
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < hashsize; i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dstate->dtds_hash[i].dtdh_chain = &dtrace_dynhash_sink;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_dynhash_sink.dtdv_hashval != DTRACE_DYNHASH_SINK)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dynhash_sink.dtdv_hashval = DTRACE_DYNHASH_SINK;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Determine number of active CPUs. Divide free list evenly among
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * active CPUs.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((uintptr_t)base + hashsize * sizeof (dtrace_dynhash_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync maxper = (maxper / dstate->dtds_chunksize) * dstate->dtds_chunksize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < NCPU; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we don't even have enough chunks to make it once through
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * NCPUs, we're just going to allocate everything to the first
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CPU. And if we're on the last CPU, we're going to allocate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * whatever is left over. In either case, we set the limit to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be the limit of the dynamic variable space.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((uintptr_t)next + dstate->dtds_chunksize >= limit)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_cache_free(dtrace_state_cache, dstate->dtds_percpu);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Logical XOR, where are you?
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT((vstate->dtvs_nglobals == 0) ^ (vstate->dtvs_globals != NULL));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(vstate->dtvs_globals, vstate->dtvs_nglobals *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(vstate->dtvs_tlocals, vstate->dtvs_ntlocals *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT((vstate->dtvs_nlocals == 0) ^ (vstate->dtvs_locals != NULL));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(vstate->dtvs_locals, vstate->dtvs_nlocals *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dynvar_clean(&state->dts_vstate.dtvs_dynvars);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsyncstatic DECLCALLBACK(void) dtrace_state_clean_timer(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync now - state->dts_laststatus >= dtrace_deadman_user)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We must be sure that dts_alive never appears to be less than the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * value upon entry to dtrace_state_deadman(), and because we lack a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_cas64(), we cannot store to it atomically. We thus instead
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * store INT64_MAX to it, followed by a memory barrier, followed by
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the new value. This assures that dts_alive never appears to be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * less than its true value, regardless of the order in which the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * stores to the underlying storage are issued.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsyncstatic DECLCALLBACK(void) dtrace_state_deadman_timer(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync char c[30];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync minor = (minor_t)(uintptr_t)vmem_alloc(dtrace_minor, 1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (ddi_soft_state_zalloc(dtrace_softstate, minor) != DDI_SUCCESS) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(dtrace_minor, (void *)(uintptr_t)minor, 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state = ddi_get_soft_state(dtrace_softstate, minor);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) snprintf(c, sizeof (c), "dtrace_aggid_%d", minor);
e46bf954ce595391f515107cc0f33ea9d5c4f771vboxsync (void) snprintf(c, sizeof (c), "dtrace_aggid_%p", state);
43f7c4f47ea6a1568ad9333334a3f456423cffbbvboxsync#ifndef VBOX /* Avoid idProbe = UINT32_MAX as it is used as invalid value by VTG. */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_aggid_arena = vmem_create(c, (void *)1, UINT32_MAX, 1,
43f7c4f47ea6a1568ad9333334a3f456423cffbbvboxsync state->dts_aggid_arena = vmem_create(c, (void *)1, _1G, 1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We allocate NCPU buffers. On the one hand, this can be quite
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a bit of memory per instance (nearly 36K on a Starcat). On the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * other hand, it saves an additional memory reference in the probe
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_buffer = kmem_zalloc(bufsize, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_aggbuffer = kmem_zalloc(bufsize, KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < DTRACEOPT_MAX; i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set the default options.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_BUFPOLICY] = DTRACEOPT_BUFPOLICY_SWITCH;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_BUFRESIZE] = DTRACEOPT_BUFRESIZE_AUTO;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_CPU] = (dtrace_optval_t)DTRACE_CPUALL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_STACKFRAMES] = dtrace_stackframes_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_USTACKFRAMES] = dtrace_ustackframes_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_CLEANRATE] = dtrace_cleanrate_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_SWITCHRATE] = dtrace_switchrate_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_STATUSRATE] = dtrace_statusrate_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_JSTACKFRAMES] = dtrace_jstackframes_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_JSTACKSTRSIZE] = dtrace_jstackstrsize_default;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Depending on the user credentials, we set flag bits which alter probe
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * visibility or the amount of destructiveness allowed. In the case of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * actual anonymous tracing, or the possession of all privileges, all of
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the normal checks are bypassed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (cr == NULL || PRIV_POLICY_ONLY(cr, PRIV_ALL, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set up the credentials for this instantiation. We take a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hold on the credential to prevent it from disappearing on
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * us; this in turn prevents the zone_t referenced by this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * credential from disappearing. This means that we can
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * examine the credential and the zone from probe context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * CRA_PROC means "we have *some* privilege for dtrace" and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * unlocks the use of variables like pid, zonename, etc.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_user allows use of syscall and profile providers.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the user also has proc_owner and/or proc_zone, we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * extend the scope to include additional visibility and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * destructive power.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_PROC_ZONE, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have all privs in whatever zone this is,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we can do destructive things to processes which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have altered credentials.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (priv_isequalset(priv_getset(cr, PRIV_EFFECTIVE),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Holding the dtrace_kernel privilege also implies that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the user has the dtrace_user privilege from a visibility
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * perspective. But without further privileges, some
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * destructive actions are not available.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_KERNEL, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Make all probes in all zones visible. However,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this doesn't mean that all actions become available
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to all zones.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Holding proc_owner means that destructive actions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for *this* zone are allowed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Holding proc_zone means that destructive actions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for this user/group ID in all zones is allowed.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have all privs in whatever zone this is,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we can do destructive things to processes which
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have altered credentials.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (priv_isequalset(priv_getset(cr, PRIV_EFFECTIVE),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Holding the dtrace_proc privilege gives control over fasttrap
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and pid providers. We need to grant wider destructive
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * privileges in the event that the user has proc_owner and/or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * proc_zone.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_PROC, B_FALSE)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_state_buffer(dtrace_state_t *state, dtrace_buffer_t *buf, int which)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_activity == DTRACE_ACTIVITY_INACTIVE ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[which] == DTRACEOPT_UNSET || opt[which] == 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_BUFPOLICY] == DTRACEOPT_BUFPOLICY_RING)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_BUFPOLICY] == DTRACEOPT_BUFPOLICY_FILL)
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (size = opt[which]; size >= VBDTCAST(dtrace_optval_t)sizeof (uint64_t); size >>= 1) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The size must be 8-byte aligned. If the size is not 8-byte
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aligned, drop it down by the difference.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Buffers always must be large enough to accommodate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * their prereserved space. We return E2BIG instead
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of ENOMEM in this case to allow for user-level
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * software to differentiate the cases.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_BUFRESIZE] == DTRACEOPT_BUFRESIZE_MANUAL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = state->dts_speculations;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rval = dtrace_state_buffer(state, state->dts_buffer,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rval = dtrace_state_buffer(state, state->dts_aggbuffer,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_options[DTRACEOPT_BUFPOLICY] != DTRACEOPT_BUFPOLICY_FILL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If our buffer policy is a "fill" buffer policy, we need to set the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * prereserved space to be the space required by the END probes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (ecb = probe->dtpr_ecb; ecb != NULL; ecb = ecb->dte_next) {
34812c4f416dad7cfa197fea648d04d7c95e63d2vboxsync state->dts_reserve += VBDTCAST(uint32_t)ecb->dte_needed + ecb->dte_alignment;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_state_go(dtrace_state_t *state, processorid_t *cpu)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_optval_t *opt = state->dts_options, sz, nspec;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int rval = 0, i, bufsize = NCPU * sizeof (dtrace_buffer_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we can perform any checks, we must prime all of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * retained enablings that correspond to this state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_destructive && !state->dts_cred.dcr_destructive) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we want to do is try to allocate our speculations.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We do not automatically resize the number of speculations; if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this fails, we will fail the operation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync spec = kmem_zalloc(nspec * sizeof (dtrace_speculation_t), KM_NOSLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nspec; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((buf = kmem_zalloc(bufsize, KM_NOSLEEP)) == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We want "grabanon" to be set in the grabbed state, so we'll
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * copy that option value from the grabbing state into the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * grabbed state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the anonymous state is active (as it almost certainly
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * is if the anonymous enabling ultimately matched anything),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we don't allow any further option processing -- but we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * don't return failure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're not going to create an aggregation buffer
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * because we don't have any ECBs that contain
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * aggregations -- set this option to 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have an aggregation buffer, we must also have
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * a buffer to use as scratch.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync opt[DTRACEOPT_BUFSIZE] < VBDTCAST(dtrace_optval_t)state->dts_needed) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're not going to create speculation buffers
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * because we don't have any ECBs that actually
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * speculate -- set the speculation size to 0.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The bare minimum size for any buffer that we're actually going to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * do anything to is sizeof (uint64_t).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((state->dts_needed != 0 && opt[DTRACEOPT_BUFSIZE] < sz) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (state->dts_speculates && opt[DTRACEOPT_SPECSIZE] < sz) ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (state->dts_aggregations != NULL && opt[DTRACEOPT_AGGSIZE] < sz)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * A buffer size has been explicitly set to 0 (or to a size
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that will be adjusted to 0) and we need the space -- we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * need to return failure. We return ENOSPC to differentiate
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it from failing to allocate a buffer due to failure to meet
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the reserve (for which we return E2BIG).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((sz = opt[DTRACEOPT_DYNVARSIZE]) == DTRACEOPT_UNSET)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rval = dtrace_dstate_init(&state->dts_vstate.dtvs_dynvars, sz);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_BUFRESIZE] == DTRACEOPT_BUFRESIZE_MANUAL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_STATUSRATE] > dtrace_statusrate_max)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_CLEANRATE] < dtrace_cleanrate_min)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (opt[DTRACEOPT_CLEANRATE] > dtrace_cleanrate_max)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_alive = state->dts_laststatus = dtrace_gethrtime();
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#else /* VBOX */
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync rval = RTTimerCreateEx(&state->dts_cleaner, opt[DTRACEOPT_CLEANRATE],
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync RTTIMER_FLAGS_CPU_ANY, dtrace_state_clean_timer, state);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync state->dts_alive = state->dts_laststatus = dtrace_gethrtime();
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync rval = RTTimerCreateEx(&state->dts_deadman, dtrace_deadman_interval,
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync RTTIMER_FLAGS_CPU_ANY, dtrace_state_deadman_timer, state);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#endif /* VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now it's time to actually fire the BEGIN probe. We need to disable
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interrupts here both to record the CPU on which we fired the BEGIN
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probe (the data from this CPU will be processed first at user
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * level) and to manually activate the buffer for this CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_buffer[*cpu].dtb_flags & DTRACEBUF_INACTIVE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_buffer[*cpu].dtb_flags &= ~DTRACEBUF_INACTIVE;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We may have had an exit action from a BEGIN probe; only change our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * state to ACTIVE if we're still in WARMUP.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_activity == DTRACE_ACTIVITY_WARMUP ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Regardless of whether or not now we're in ACTIVE or DRAINING, we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * want each CPU to transition its principal buffer out of the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * INACTIVE state. Doing this assures that no CPU will suddenly begin
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * processing an ECB halfway down a probe's ECB chain; all CPUs will
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * atomically transition from processing none of a state's ECBs to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * processing all of them.
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync RTMpOnAll(dtrace_buffer_activate_wrapper, state, NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(spec, nspec * sizeof (dtrace_speculation_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_state_stop(dtrace_state_t *state, processorid_t *cpu)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_ACTIVE &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We'll set the activity to DTRACE_ACTIVITY_DRAINING, and issue a sync
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to be sure that every CPU has seen it. See below for the details
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * on why this is done.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * By this point, it is impossible for any CPU to be still processing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * with DTRACE_ACTIVITY_ACTIVE. We can thus set our activity to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTRACE_ACTIVITY_COOLDOWN and know that we're not racing with any
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * other CPU in dtrace_buffer_reserve(). This allows dtrace_probe()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and callees to know that the activity is DTRACE_ACTIVITY_COOLDOWN
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * iff we're in the END probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(state->dts_activity == DTRACE_ACTIVITY_COOLDOWN);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, we can release the reserve and call the END probe. We
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * disable interrupts across calling the END probe to allow us to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * return the CPU on which we actually called the END probe. This
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * allows user-land to be sure that this CPU's principal buffer is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * processed last.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_state_option(dtrace_state_t *state, dtrace_optid_t option,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is an otherwise negative value, set it to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the highest multiple of 128m less than LONG_MAX.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Technically, we're adjusting the size without
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * regard to the buffer resizing policy, but in fact,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this has no effect -- if we set the buffer size to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * ~LONG_MAX and the buffer policy is ultimately set to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * be "manual", the buffer allocation is guaranteed to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * fail, if only because the allocation requires two
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffers. (We set the the size to the highest
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * multiple of 128m because it ensures that the size
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * will remain a multiple of a megabyte when
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * repeatedly halved -- all the way down to 15m.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_speculation_t *spec = state->dts_speculations;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * First, retract any retained enablings for this state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity == DTRACE_ACTIVITY_ACTIVE ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have managed to come into dtrace_state_destroy() on a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * hot enabling -- almost certainly because of a disorderly
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * shutdown of a consumer. (That is, a consumer that is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * exiting without having called dtrace_stop().) In this case,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're going to set our activity to be KILLED, and then
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * issue a sync to be sure that everyone is out of probe
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * context before we start blowing away ECBs.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Release the credential hold we took in dtrace_state_create().
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we can safely disable and destroy any enabled probes. Because
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * any DTRACE_PRIV_KERNEL probes may actually be slowing our progress
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (especially if they're all enabled), we take two passes through the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * ECBs: in the first, we disable just DTRACE_PRIV_KERNEL probes, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * in the second we disable whatever is left over.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we free the buffers, perform one more sync to assure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * every CPU is out of probe context.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nspec; i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(state->dts_ecbs, state->dts_necbs * sizeof (dtrace_ecb_t *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state->dts_naggregations * sizeof (dtrace_aggregation_t *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < nspec; i++)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(spec, nspec * sizeof (dtrace_speculation_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(dtrace_minor, (void *)(uintptr_t)minor, 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Anonymous Enabling Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; ; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We want to create anonymous state, so we need to transition
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the kernel debugger to indicate that DTrace is active. If
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this fails (e.g. because the debugger has modified text in
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * some way), we won't continue with the processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (kdi_dtrace_set(KDI_DTSET_DTRACE_ACTIVATE) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_NOTE, "kernel debugger active; anonymous "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "enabling ignored.");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we haven't allocated an anonymous state, we'll do so now.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This basically shouldn't happen: the only
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * failure mode from dtrace_state_create() is a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * failure of ddi_soft_state_zalloc() that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * itself should never happen. Still, the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * interface allows for a failure mode, and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we want to fail as gracefully as possible:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we'll emit an error message and cease
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * processing anonymous state in this case.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "anonymous state");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rv = dtrace_dof_slurp(dof, &state->dts_vstate, CRED(),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (rv != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This is malformed DOF; chuck any anonymous state
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that we created.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_enabling_retain() can only fail because we are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * trying to retain more enablings than are allowed -- but
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we only have one anonymous enabling, and we are guaranteed
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to be allowed at least one retained enabling; we assert
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that dtrace_enabling_retain() returns success.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync rval = dtrace_enabling_retain(dtrace_anon.dta_enabling);
438454ff8daa23d4d97c226d93b663f6c003ff45vboxsync#endif /* !VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Helper Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_mstate_t *mstate, dtrace_vstate_t *vstate, int where)
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync uint16_t flags = cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync ASSERT(vstate->dtvs_nlocals <= VBDTCAST(int32_t)dtrace_helptrace_nlocals);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * What would a tracing framework be without its own tracing
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * framework? (Well, a hell of a lot simpler, for starters...)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync size = sizeof (dtrace_helptrace_t) + dtrace_helptrace_nlocals *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Iterate until we can allocate a slot in the trace buffer.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (next + size < VBDTCAST(unsigned)dtrace_helptrace_bufsize) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync } while (dtrace_cas32(&dtrace_helptrace_next, next, nnext) != next);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have our slot; fill it in.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ent = (dtrace_helptrace_t *)&dtrace_helptrace_buffer[next];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ent->dtht_fltoffs = (mstate->dtms_present & DTRACE_MSTATE_FLTOFFS) ?
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync ent->dtht_illval = cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_illval;
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = 0; VBDTCAST(int32_t)i < vstate->dtvs_nlocals; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(svar->dtsv_size >= NCPU * sizeof (uint64_t));
5a3672dca0301427a400aec8734acd70e2cf24a4vboxsync ((uint64_t *)(uintptr_t)svar->dtsv_data)[VBDT_GET_CPUID()];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_state_t *state, uint64_t arg0, uint64_t arg1)
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync VBDTTYPE(uint16_t volatile *, uint16_t *)flags = &cpu_core[VBDT_GET_CPUID()].cpuc_dtrace_flags;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helpers_t *helpers = curproc->p_dtrace_helpers;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(which >= 0 && which < DTRACE_NHELPER_ACTIONS);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((helper = helpers->dthps_actions[which]) == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now iterate over each helper. If its predicate evaluates to 'true',
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we'll call the corresponding actions. Note that the below calls
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to dtrace_dif_emulate() may set faults in machine state. This is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * okay: our caller (the outer dtrace_dif_emulate()) will simply plow
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the stored DIF offset with its own (which is the desired behavior).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Also, note the calls to dtrace_dif_emulate() may allocate scratch
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from machine state; this is okay, too.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (; helper != NULL; helper = helper->dtha_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_dif_emulate(pred, mstate, vstate, state))
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Restore the arg0 that we saved upon entry.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Restore the arg0 that we saved upon entry.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_action_destroy(dtrace_helper_action_t *helper,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_difo_release(helper->dtha_predicate, vstate);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_difo_release(helper->dtha_actions[i], vstate);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(helper, sizeof (dtrace_helper_action_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (h = help->dthps_actions[i]; h != NULL; h = next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Interate until we've cleared out all helper providers with the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * given generation number.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Look for a helper provider with the right generation. We
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have to start back at the beginning of the list each time
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * because we drop dtrace_lock. It's unlikely that we'll make
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * more than two passes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there were no matches, we're done.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Move the last helper provider into this slot.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync help->dthps_provs[i] = help->dthps_provs[help->dthps_nprovs];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have a meta provider, remove this helper provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_validate(dtrace_helper_action_t *helper)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err += dtrace_difo_validate_helper(helper->dtha_actions[i]);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (err == 0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_action_add(int which, dtrace_ecbdesc_t *ep)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (count = 0; last != NULL; last = last->dtha_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we already have dtrace_helper_actions_max helper actions for this
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * helper action type, we'll refuse to add a new one.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync helper = kmem_zalloc(sizeof (dtrace_helper_action_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((pred = ep->dted_pred.dtpdd_predicate) != NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ep->dted_action; act != NULL; act = act->dtad_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync helper->dtha_actions = kmem_zalloc(sizeof (dtrace_difo_t *) *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ep->dted_action, i = 0; act != NULL; act = act->dtad_next) {
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (vstate->dtvs_nlocals > VBDTCAST(int32_t)dtrace_helptrace_nlocals) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_register(proc_t *p, dtrace_helpers_t *help,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (!dtrace_attached() || dtrace_meta_pid == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the dtrace module is loaded but not attached, or if
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * there aren't isn't a meta provider registered to deal with
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * these provider descriptions, we need to postpone creating
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the actual providers until later.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (help->dthps_next == NULL && help->dthps_prev == NULL &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the dtrace module is loaded and we have a particular
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * helper provider description, pass that off to the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * meta provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Otherwise, just pass all the helper provider descriptions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * off to the meta provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helper_provide(&help->dthps_provs[i]->dthp_prov,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_add(dof_helper_t *dofhp, int gen)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we already have dtrace_helper_providers_max helper providers,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we're refuse to add a new one.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (help->dthps_nprovs >= dtrace_helper_providers_max)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Check to make sure this isn't a duplicate.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync hprov = kmem_zalloc(sizeof (dtrace_helper_provider_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Allocate a bigger table for helper providers if it's already full.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (help->dthps_maxprovs > dtrace_helper_providers_max)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync help->dthps_maxprovs = dtrace_helper_providers_max;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync help->dthps_provs = kmem_zalloc(help->dthps_maxprovs *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_destroy(dtrace_helper_provider_t *hprov)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dof = (dof_hdr_t *)(uintptr_t)hprov->dthp_prov.dofhp_dof;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(hprov, sizeof (dtrace_helper_provider_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_provider_validate(dof_hdr_t *dof, dof_sec_t *sec)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dof_sec_t *str_sec, *prb_sec, *arg_sec, *off_sec, *enoff_sec;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "misaligned section offset");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The section needs to be large enough to contain the DOF provider
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * structure appropriate for the given version.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ((dof->dofh_ident[DOF_ID_VERSION] == DOF_VERSION_1) ?
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "provider section too small");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync str_sec = dtrace_dof_sect(dof, DOF_SECT_STRTAB, provider->dofpv_strtab);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prb_sec = dtrace_dof_sect(dof, DOF_SECT_PROBES, provider->dofpv_probes);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync arg_sec = dtrace_dof_sect(dof, DOF_SECT_PRARGS, provider->dofpv_prargs);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync off_sec = dtrace_dof_sect(dof, DOF_SECT_PROFFS, provider->dofpv_proffs);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (enoff_sec = dtrace_dof_sect(dof, DOF_SECT_PRENOFFS,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strlen(strtab + provider->dofpv_name) >= DTRACE_PROVNAMELEN) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (prb_sec->dofs_entsize & (sizeof (uintptr_t) - 1)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (off_sec->dofs_offset & (sizeof (uint32_t) - 1)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(dof, "misaligned section offset");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync arg = (uint8_t *)(uintptr_t)(daddr + arg_sec->dofs_offset);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync nprobes = prb_sec->dofs_size / prb_sec->dofs_entsize;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Take a pass through the probes to check for errors.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (j = 0; j < nprobes; j++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (strlen(strtab + probe->dofpr_func) >= DTRACE_FUNCNAMELEN) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync strlen(strtab + probe->dofpr_name) >= DTRACE_NAMELEN) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The offset count must not wrap the index, and the offsets
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * must also not overflow the section's data.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there's no is-enabled offset section, make sure
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * there aren't any is-enabled offsets. Otherwise
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * perform the same checks as for probe offsets
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (immediately above).
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "offsets with null section");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (probe->dofpr_noffs + probe->dofpr_nenoffs == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "is-enabled offsets");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "native argument type");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "argument type too long");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (arg[probe->dofpr_argidx + k] > probe->dofpr_nargc) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "native argument index");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "translated argument type");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync "type too long");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_helper_slurp(dof_hdr_t *dof, dof_helper_t *dhp)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync int i, gen, rv, nhelpers = 0, nprovs = 0, destroy = 1;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = dtrace_dof_slurp(dof, vstate, NULL, &enab,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dhp != NULL ? dhp->dofhp_addr : 0, B_FALSE)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Look for helper providers and validate their descriptions.
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = 0; i < VBDTCAST(int)dof->dofh_secnum; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_helper_provider_validate(dof, sec) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now we need to walk through the ECB descriptions in the enabling.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rv = dtrace_helper_action_add(DTRACE_HELPER_ACTION_USTACK,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Adding this helper action failed -- we are now going
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to rip out the entire generation and return failure.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) dtrace_helper_destroygen(help->dthps_generation);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (-1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helper_provider_register(curproc, help, dhp);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync help = kmem_zalloc(sizeof (dtrace_helpers_t), KM_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync help->dthps_actions = kmem_zalloc(sizeof (dtrace_helper_action_t *) *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're now going to lose the help from this process.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Destory the helper actions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (h = help->dthps_actions[i]; h != NULL; h = next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Destroy the helper providers.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Remove the helper from the deferred list.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helper_provider_destroy(help->dthps_provs[i]);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(help->dthps_provs, help->dthps_maxprovs *
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sizeof (dtrace_helper_action_t *) * DTRACE_NHELPER_ACTIONS);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync newhelp->dthps_generation = help->dthps_generation;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Duplicate the helper actions.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (last = NULL; helper != NULL; helper = helper->dtha_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sz = sizeof (dtrace_difo_t *) * new->dtha_nactions;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Duplicate the helper providers and register them with the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace framework.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync newhelp->dthps_provs = kmem_alloc(newhelp->dthps_nprovs *
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync for (i = 0; i < VBDTCAST(int)newhelp->dthps_nprovs; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_helper_provider_register(to, newhelp, NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Hook Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We're going to call each providers per-module provide operation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * specifying only this module.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (prv = dtrace_provider; prv != NULL; prv = prv->dtpv_next)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prv->dtpv_pops.dtps_provide_module(prv->dtpv_arg, ctl);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we have any retained enablings, we need to match against them.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Enabling probes requires that cpu_lock be held, and we cannot hold
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cpu_lock here -- it is legal for cpu_lock to be held when loading a
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * module. (In particular, this happens when loading scheduling
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * classes.) So if we have any retained enablings, we need to dispatch
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * our task queue to do the match for us.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (task_func_t *)dtrace_enabling_matchall, NULL, TQ_SLEEP);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * And now, for a little heuristic sleaze: in general, we want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * match modules as soon as they load. However, we cannot guarantee
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this, because it would lead us to the lock ordering violation
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * outlined above. The common case, of course, is that cpu_lock is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * _not_ held -- so we delay here for a clock tick, hoping that that's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * long enough for the task queue to do its work. If it's not, it's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not a serious problem -- it just means that the module that we
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * just loaded may not be immediately instrumentable.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * The DTrace module is loaded (obviously) but not attached;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we don't have any work to do.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (probe = first = dtrace_hash_lookup(dtrace_bymod, &template);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * This shouldn't _actually_ be possible -- we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * unloading a module that has an enabled probe in it.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * (It's normally up to the provider to make sure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * this can't happen.) However, because dtps_enable()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * doesn't have a failure mode, there can be an
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enable/unload race. Upshot: we don't want to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * assert, but we're not going to disable the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probe, either.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(dtrace_probes[probe->dtpr_id - 1] == probe);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We've removed all of the module's probes from the hash chains and
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * from the probe array. Now issue a dtrace_sync() to be sure that
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * everyone has cleared out from any probe array processing.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (probe = first; probe != NULL; probe = first) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync prov->dtpv_pops.dtps_destroy(prov->dtpv_arg, probe->dtpr_id,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync vmem_free(dtrace_arena, (void *)(uintptr_t)probe->dtpr_id, 1);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#endif /* !VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probe_foreach(offsetof(dtrace_pops_t, dtps_suspend));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probe_foreach(offsetof(dtrace_pops_t, dtps_resume));
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsynctypedef enum {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_cpu_setup(cpu_setup_t what, processorid_t cpu)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * For now, we only allocate a new buffer for anonymous state.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (c != DTRACE_CPUALL && c != DTRACEOPT_UNSET && c != cpu)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Regardless of what the actual policy is, we're going to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * temporarily set our resize policy to be manual. We're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * also going to temporarily set our CPU option to denote
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the newly configured CPU.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync opt[DTRACEOPT_BUFRESIZE] = DTRACEOPT_BUFRESIZE_MANUAL;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We don't free the buffer in the CPU_UNCONFIG case. (The
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer will be freed when the consumer exits.)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#endif /* !VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_toxrange_add(uintptr_t base, uintptr_t limit)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync osize = dtrace_toxranges_max * sizeof (dtrace_toxrange_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync nsize = dtrace_toxranges_max * sizeof (dtrace_toxrange_t);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(dtrace_toxrange[dtrace_toxranges].dtt_base == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(dtrace_toxrange[dtrace_toxranges].dtt_limit == NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_toxrange[dtrace_toxranges].dtt_limit = limit;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * DTrace Driver Cookbook Functions
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sizeof (dtrace_state_t), 0) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_NOTE, "/dev/dtrace failed to initialize soft state");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (ddi_create_minor_node(devi, DTRACEMNR_DTRACE, S_IFCHR,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACEMNRN_DTRACE, DDI_PSEUDO, NULL) == DDI_FAILURE ||
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ddi_create_minor_node(devi, DTRACEMNR_HELPER, S_IFCHR,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACEMNRN_HELPER, DDI_PSEUDO, NULL) == DDI_FAILURE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_NOTE, "/dev/dtrace couldn't create minor nodes");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync register_cpu_setup_func((cpu_setup_func_t *)dtrace_cpu_setup, NULL);
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync /** @todo some of these hooks needs checking out! */
43f7c4f47ea6a1568ad9333334a3f456423cffbbvboxsync#ifndef VBOX /* Reduce the area a bit just to be sure our vmem fake doesn't blow up. */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_arena = vmem_create("dtrace", (void *)1, UINT32_MAX, 1,
43f7c4f47ea6a1568ad9333334a3f456423cffbbvboxsync dtrace_arena = vmem_create("dtrace", (void *)1, UINT32_MAX - 16, 1,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_minor = vmem_create("dtrace_minor", (void *)DTRACEMNRN_CLONE,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync UINT32_MAX - DTRACEMNRN_CLONE, 1, NULL, NULL, NULL, 0,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_taskq = taskq_create("dtrace_taskq", 1, maxclsyspri,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_state_cache = kmem_cache_create("dtrace_state_cache",
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name),
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync cmn_err(CE_WARN, "illegal value (%lu) for dtrace_retain_max; "
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now discover our toxic ranges.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we register ourselves as a provider to our own framework,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we would like to assert that dtrace_provider is NULL -- but that's
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not true if we were loaded as a dependency of a DTrace provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Once we've registered, we can assert that dtrace_provider is our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * pseudo provider.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) dtrace_register("dtrace", &dtrace_provider_attr,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT((dtrace_provider_id_t)dtrace_provider == id);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If DTrace helper tracing is enabled, we need to allocate the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * trace buffer and initialize the values.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there are already providers, we must ask them to provide their
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * probes, and then match any anonymous enabling against them. Note
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * that there should be no other retained enablings at this time:
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the only retained enablings at this time should be the anonymous
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enabling.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We couldn't hold cpu_lock across the above call to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_enabling_provide(), but we must hold it to actually
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * enable the probes. We have to drop all of our locks, pick
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * up cpu_lock, and regain our locks before matching the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * retained anonymous enabling.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we created any anonymous state, set it going now.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncint dtrace_open(dtrace_state_t **ppState, cred_t *cred_p)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this wasn't an open with the "helper" minor, then it must be
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the "dtrace" minor.
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync#endif /* !VBOX */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If no DTRACE_PRIV_* bits are set in the credential, then the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * caller lacks sufficient permission to do anything with DTrace.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Ask all providers to provide all their probes.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the kernel debugger is active (that is, if the kernel debugger
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * modified text in some way), we won't allow the open.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (kdi_dtrace_set(KDI_DTSET_DTRACE_ACTIVATE) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (--dtrace_opens == 0 && dtrace_anon.dta_enabling == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_close(dev_t dev, int flag, int otyp, cred_t *cred_p)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state = ddi_get_soft_state(dtrace_softstate, minor);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There is anonymous state. Destroy that first.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Only relinquish control of the kernel debugger interface when there
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * are no consumers and no anonymous enablings.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (--dtrace_opens == 0 && dtrace_anon.dta_enabling == NULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &help, sizeof (help)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dof_error(NULL, "failed to copyin DOF helper");
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync /*FALLTHROUGH*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * dtrace_helper_slurp() takes responsibility for the dof --
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it may free it now or it may save it and free it later.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rval = dtrace_helper_slurp(dof, dhp)) != -1) {
438454ff8daa23d4d97c226d93b663f6c003ff45vboxsync#endif /* !VBOX */
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsyncint dtrace_ioctl(dtrace_state_t *state, int cmd, intptr_t arg, int32_t *rv)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_ioctl(dev_t dev, int cmd, intptr_t arg, int md, cred_t *cr, int *rv)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync state = ddi_get_soft_state(dtrace_softstate, minor);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (pvp = dtrace_provider; pvp != NULL; pvp = pvp->dtpv_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy(&pvp->dtpv_priv, &pvd.dtvd_priv, sizeof (dtrace_ppriv_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync bcopy(&pvp->dtpv_attr, &pvd.dtvd_attr, sizeof (dtrace_pattr_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &epdesc, sizeof (epdesc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((ecb = dtrace_epid2ecb(state, epdesc.dtepd_epid)) == NULL) {
34812c4f416dad7cfa197fea648d04d7c95e63d2vboxsync epdesc.dtepd_size = VBDTCAST(uint32_t)ecb->dte_size;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now that we have the size, we need to allocate a temporary
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer in which to store the complete description. We need
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the temporary buffer to be able to drop dtrace_lock()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * across the copyout(), below.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dest += offsetof(dtrace_eprobedesc_t, dtepd_rec[0]);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(buf, (void *)arg, dest - (uintptr_t)buf) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &aggdesc, sizeof (aggdesc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((agg = dtrace_aggid2agg(state, aggdesc.dtagd_id)) == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync aggdesc.dtagd_size = lrec->dtrd_offset + lrec->dtrd_size - offs;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = agg->dtag_first; ; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this action has a record size of zero, it
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * denotes an argument to the aggregating action.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Because the presence of this record doesn't (or
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * shouldn't) affect the way the data is interpreted,
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * we don't copy it out to save user-level the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * confusion of dealing with a zero-length record.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Now that we have the size, we need to allocate a temporary
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * buffer in which to store the complete description. We need
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the temporary buffer to be able to drop dtrace_lock()
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * across the copyout(), below.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (act = agg->dtag_first; ; act = act->dta_next) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See the comment in the above loop for why we pass
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * over zero-length records.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(buf, (void *)arg, dest - (uintptr_t)buf) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If a NULL argument has been passed, we take this as our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * cue to reevaluate our enablings.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_dof_slurp(dof, vstate, cr, &enab, 0, B_TRUE) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((rval = dtrace_dof_options(dof, state)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((err = dtrace_enabling_match(enab, rv)) == 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync match->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync create->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync err = dtrace_enabling_replicate(state, match, create);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Before we attempt to match this probe, we want to give
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * all providers the opportunity to provide it.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (m < 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if ((probe = dtrace_probes[desc.dtargd_id - 1]) == NULL) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * There isn't any typed information for this probe.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Set the argument number to DTRACE_ARGNONE.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&cpuid, (void *)arg, sizeof (cpuid)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&cpuid, (void *)arg, sizeof (cpuid)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync if (/*VBox value is is unsigned: desc.dtbd_cpu < 0 ||*/ desc.dtbd_cpu >= NCPU)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL)) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity != DTRACE_ACTIVITY_STOPPED) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this buffer has already been consumed, we're
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * going to indicate that there's nothing left here
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to consume.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If this is a ring buffer that has wrapped, we want
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * to copy the whole thing out.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(buf->dtb_tomax, desc.dtbd_data, sz) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync RTMpOnAll(dtrace_buffer_switch_wrapper, buf, NULL);
ef9c962545db78446d6972a43e5f1e0aa12aeb07vboxsync RTMpOnSpecific(desc.dtbd_cpu, dtrace_buffer_switch_wrapper, buf, NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If the buffers did not actually switch, then the cross call
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * did not take place -- presumably because the given CPU is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * not in the ready set. If this is the case, we'll return
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We have our snapshot; now copy it out.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Finally, copy out the buffer description.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&conf, (void *)arg, sizeof (conf)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * See the comment in dtrace_state_deadman() for the reason
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * for setting dts_laststatus to INT64_MAX before setting
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * it to the correct value.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_activity == DTRACE_ACTIVITY_DRAINING)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync for (i = 0; i < NCPU; i++) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[i];
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync stat.dtst_dyndrops_dirty += dcpu->dtdsc_dirty_drops;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync stat.dtst_dyndrops_rinsing += dcpu->dtdsc_rinsing_drops;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (state->dts_buffer[i].dtb_flags & DTRACEBUF_FULL)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync stat.dtst_specdrops_busy = state->dts_speculations_busy;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync stat.dtst_specdrops_unavail = state->dts_speculations_unavail;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync stat.dtst_stkstroverflows = state->dts_stkstroverflows;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&stat, (void *)arg, sizeof (stat)) != 0)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * Format strings are allocated contiguously and they are
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * never freed; if a format index is less than the number
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * of formats, we can assert that the format map is non-NULL
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * and that the format for the specified index is non-NULL.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (copyout(&fmt, (void *)arg, sizeof (fmt)) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync return (0);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync if (dtrace_unregister((dtrace_provider_id_t)dtrace_provider) != 0) {
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If there were ECBs on this state, the provider should
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * have not been allowed to detach; assert that there is
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * If we're being detached with anonymous state, we need to
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * indicate to the kernel debugger that DTrace is now inactive.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync (void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync unregister_cpu_setup_func((cpu_setup_func_t *)dtrace_cpu_setup, NULL);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dtrace_helptrace_buffer, dtrace_helptrace_bufsize);
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync kmem_free(dtrace_probes, dtrace_nprobes * sizeof (dtrace_probe_t *));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync dtrace_toxranges_max * sizeof (dtrace_toxrange_t));
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * We don't destroy the task queue until after we have dropped our
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * locks (taskq_destroy() may block on running tasks). To prevent
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * attempting to do work after we have effectively detached but before
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * the task queue has been destroyed, all tasks dispatched via the
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * task queue must check that DTrace is still attached before
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync * performing any operation.
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync/*ARGSUSED*/
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsyncdtrace_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync *result = (void *)0;
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync 0, /* streamtab */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync 0, /* refcnt */
14ea49401f3c8c61422aefbda43809e275f60c6cvboxsync &mod_driverops, /* module type (this is a pseudo driver) */
49b97135c86693da9b34e628ff4c5d8809768f4bvboxsync#endif /* !VBOX */