/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "thr_uberdata.h"
#include <sys/stack.h>
/*
* Initialization of the main stack is performed in libc_init().
* Initialization of thread stacks is performed in _thrp_setup().
*/
#pragma weak _stack_getbounds = stack_getbounds
int
stack_getbounds(stack_t *sp)
{
*sp = curthread->ul_ustack;
return (0);
}
#pragma weak _stack_setbounds = stack_setbounds
int
stack_setbounds(const stack_t *sp)
{
ulwp_t *self = curthread;
if (sp == NULL || sp->ss_sp == NULL ||
(uintptr_t)sp->ss_sp != SA((uintptr_t)sp->ss_sp) ||
sp->ss_flags != 0 || sp->ss_size < MINSIGSTKSZ ||
(uintptr_t)sp->ss_size != SA((uintptr_t)sp->ss_size)) {
errno = EINVAL;
return (-1);
}
sigoff(self);
self->ul_ustack = *sp;
sigon(self);
return (0);
}
/*
* Returns a boolean value:
* 1 addr is within the bounds of the current stack
* 0 addr is outside of the bounds of the current stack
* Note that addr is an unbiased value.
*/
#pragma weak _stack_inbounds = stack_inbounds
int
stack_inbounds(void *addr)
{
stack_t *ustackp = &curthread->ul_ustack;
uintptr_t base = (uintptr_t)ustackp->ss_sp;
size_t size = ustackp->ss_size;
return ((uintptr_t)addr >= base && (uintptr_t)addr < base + size);
}
#pragma weak _stack_violation = stack_violation
int
stack_violation(int sig, const siginfo_t *sip, const ucontext_t *ucp)
{
uintptr_t addr;
uintptr_t base;
size_t size;
if ((sig != SIGSEGV && sig != SIGBUS) ||
sip == NULL || ucp == NULL || SI_FROMUSER(sip))
return (0);
/*
* ucp has the correct view of the stack when the signal was raised.
*/
base = (uintptr_t)ucp->uc_stack.ss_sp;
size = ucp->uc_stack.ss_size;
#if defined(__sparc)
addr = ucp->uc_mcontext.gregs[REG_SP] + STACK_BIAS;
#elif defined(__amd64) || defined(__i386)
addr = ucp->uc_mcontext.gregs[REG_SP];
/*
* If the faulted address is just below the stack pointer we
* might be looking at a push instruction that caused the fault
* (the largest amount a push instruction can decrement the
* stack pointer by is 32). In that case, use the faulted
* address in our computation rather than the stack pointer.
*/
if (addr - (uintptr_t)sip->si_addr < 32)
addr = (uintptr_t)sip->si_addr;
#else
#error "none of __sparc, __amd64, __i386 is defined"
#endif
return (!(addr >= base && addr < base + size));
}