/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include "thr_uberdata.h"
#include <procfs.h>
#include <ucontext.h>
#include <setjmp.h>
/*
* The stack needs to be 16-byte aligned with a 4-byte bias. See comment in
* lib/libc/i386/gen/makectxt.c.
*
* Note: If you change it, you need to change it in the following files as
* well:
*
* - lib/libc/i386/gen/makectxt.c
* - lib/common/i386/crti.s
* - lib/common/i386/crt1.s
*/
#undef STACK_ALIGN
#define STACK_ALIGN 16
extern int getlwpstatus(thread_t, lwpstatus_t *);
extern int putlwpregs(thread_t, prgregset_t);
void *
setup_top_frame(void *stk, size_t stksize, ulwp_t *ulwp)
{
uint32_t *stack;
struct {
uint32_t rpc;
uint32_t arg;
uint32_t pad;
uint32_t fp;
uint32_t pc;
} frame;
/*
* Top-of-stack must be rounded down to STACK_ALIGN and
* there must be a minimum frame. Note: 'frame' is not a true
* stack frame (see <sys/frame.h>) but a construction made here to
* make it look like _lwp_start called the thread start function
* with a 16-byte aligned stack pointer (the address of frame.arg
* is the address that muet be aligned on a 16-byte boundary).
*/
stack = (uint32_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1));
/*
* This will return NULL if the kernel cannot allocate
* a page for the top page of the stack. This will cause
* thr_create(), pthread_create() or pthread_attr_setstack()
* to fail, passing the problem up to the application.
*/
stack -= 5; /* make the address of frame.arg be 16-byte aligned */
frame.pc = 0;
frame.fp = 0; /* initial address for %ebp (see EBP below) */
frame.pad = 0;
frame.arg = (uint32_t)ulwp;
frame.rpc = (uint32_t)_lwp_start;
if (uucopy(&frame, (void *)stack, sizeof (frame)) == 0)
return (stack);
return (NULL);
}
int
setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *),
ulwp_t *ulwp, caddr_t stk, size_t stksize)
{
static int initialized;
static greg_t fs, es, ds, cs, ss;
uint32_t *stack;
if (!initialized) {
ucontext_t uc;
/* do this once to load the segment registers */
uc.uc_flags = UC_CPU;
(void) __getcontext(&uc);
fs = uc.uc_mcontext.gregs[FS];
es = uc.uc_mcontext.gregs[ES];
ds = uc.uc_mcontext.gregs[DS];
cs = uc.uc_mcontext.gregs[CS];
ss = uc.uc_mcontext.gregs[SS];
initialized = 1;
}
/* clear the context and set the segment registers */
(void) memset(ucp, 0, sizeof (*ucp));
ucp->uc_mcontext.gregs[FS] = fs;
ucp->uc_mcontext.gregs[ES] = es;
ucp->uc_mcontext.gregs[DS] = ds;
ucp->uc_mcontext.gregs[CS] = cs;
ucp->uc_mcontext.gregs[SS] = ss;
/*
* Yuck.
* Use unused kernel pointer field in ucontext
* to pass down self pointer and set %gs selector
* value so __lwp_create() can setup %gs atomically.
* Without this we would need to block all signals
* and directly call ___lwp_private() in _thrp_setup
* on the other side of __lwp_create().
*/
ucp->uc_mcontext.gregs[ESP] = (greg_t)ulwp;
ucp->uc_mcontext.gregs[GS] = (greg_t)LWPGS_SEL;
/*
* Setup the top stack frame.
* If this fails, pass the problem up to the application.
*/
if ((stack = setup_top_frame(stk, stksize, ulwp)) == NULL)
return (ENOMEM);
/* fill in registers of interest */
ucp->uc_flags |= UC_CPU;
ucp->uc_mcontext.gregs[EIP] = (greg_t)func;
ucp->uc_mcontext.gregs[UESP] = (greg_t)stack;
ucp->uc_mcontext.gregs[EBP] = (greg_t)(stack + 3);
return (0);
}
/*
* Machine-dependent startup code for a newly-created thread.
*/
void *
_thrp_setup(ulwp_t *self)
{
self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz);
self->ul_ustack.ss_size = self->ul_stksiz;
self->ul_ustack.ss_flags = 0;
(void) setustack(&self->ul_ustack);
update_sched(self);
tls_setup();
/* signals have been deferred until now */
sigon(self);
if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled)
return (NULL); /* cancelled by pthread_create() */
return (self->ul_startpc(self->ul_startarg));
}
void
_fpinherit(ulwp_t *ulwp)
{
ulwp->ul_fpuenv.ftag = 0xffffffff;
}
void
getgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
rs[EIP] = status.pr_reg[EIP];
rs[EDI] = status.pr_reg[EDI];
rs[ESI] = status.pr_reg[ESI];
rs[EBP] = status.pr_reg[EBP];
rs[EBX] = status.pr_reg[EBX];
rs[UESP] = status.pr_reg[UESP];
} else {
rs[EIP] = 0;
rs[EDI] = 0;
rs[ESI] = 0;
rs[EBP] = 0;
rs[EBX] = 0;
rs[UESP] = 0;
}
}
void
setgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
status.pr_reg[EIP] = rs[EIP];
status.pr_reg[EDI] = rs[EDI];
status.pr_reg[ESI] = rs[ESI];
status.pr_reg[EBP] = rs[EBP];
status.pr_reg[EBX] = rs[EBX];
status.pr_reg[UESP] = rs[UESP];
(void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
}
}
int
__csigsetjmp(greg_t cs, greg_t ss, greg_t gs,
greg_t fs, greg_t es, greg_t ds,
greg_t edi, greg_t esi, greg_t ebp, greg_t esp,
greg_t ebx, greg_t edx, greg_t ecx, greg_t eax, greg_t eip,
sigjmp_buf env, int savemask)
{
ucontext_t *ucp = (ucontext_t *)env;
ulwp_t *self = curthread;
ucp->uc_link = self->ul_siglink;
if (self->ul_ustack.ss_flags & SS_ONSTACK)
ucp->uc_stack = self->ul_ustack;
else {
ucp->uc_stack.ss_sp =
(void *)(self->ul_stktop - self->ul_stksiz);
ucp->uc_stack.ss_size = self->ul_stksiz;
ucp->uc_stack.ss_flags = 0;
}
ucp->uc_flags = UC_STACK | UC_CPU;
if (savemask) {
ucp->uc_flags |= UC_SIGMASK;
enter_critical(self);
ucp->uc_sigmask = self->ul_sigmask;
exit_critical(self);
}
ucp->uc_mcontext.gregs[GS] = gs;
ucp->uc_mcontext.gregs[FS] = fs;
ucp->uc_mcontext.gregs[ES] = es;
ucp->uc_mcontext.gregs[DS] = ds;
ucp->uc_mcontext.gregs[EDI] = edi;
ucp->uc_mcontext.gregs[ESI] = esi;
ucp->uc_mcontext.gregs[EBP] = ebp;
ucp->uc_mcontext.gregs[ESP] = esp + 4;
ucp->uc_mcontext.gregs[EBX] = ebx;
ucp->uc_mcontext.gregs[EDX] = edx;
ucp->uc_mcontext.gregs[ECX] = ecx;
ucp->uc_mcontext.gregs[EAX] = eax;
ucp->uc_mcontext.gregs[TRAPNO] = 0;
ucp->uc_mcontext.gregs[ERR] = 0;
ucp->uc_mcontext.gregs[EIP] = eip;
ucp->uc_mcontext.gregs[CS] = cs;
ucp->uc_mcontext.gregs[EFL] = 0;
ucp->uc_mcontext.gregs[UESP] = esp + 4;
ucp->uc_mcontext.gregs[SS] = ss;
return (0);
}
void
smt_pause(void)
{
SMT_PAUSE();
}