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/*
* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
* All rights reserved.
* Copyright (C) 2000 Daniel M. Eischen <eischen@vigrid.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <unistd.h>
#include <setjmp.h>
#include <sys/param.h>
#include <sys/user.h>
#include <machine/reg.h>
#include <pthread.h>
#include "pthread_private.h"
/* Prototypes: */
static inline int check_stack(pthread_t thread, void *stackp);
#pragma weak siglongjmp=_thread_siglongjmp
#pragma weak longjmp=_thread_longjmp
#pragma weak _longjmp=__thread_longjmp
void
_thread_siglongjmp(sigjmp_buf env, int savemask)
{
struct pthread *curthread = _get_curthread();
if (check_stack(curthread, (void *) GET_STACK_SJB(env)))
PANIC("siglongjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
/*
* The stack pointer is somewhere within the threads stack.
* Jump to the users context.
*/
__siglongjmp(env, savemask);
}
void
_thread_longjmp(jmp_buf env, int val)
{
struct pthread *curthread = _get_curthread();
if (check_stack(curthread, (void *) GET_STACK_JB(env)))
PANIC("longjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
/*
* The stack pointer is somewhere within the threads stack.
* Jump to the users context.
*/
__longjmp(env, val);
}
void
__thread_longjmp(jmp_buf env, int val)
{
struct pthread *curthread = _get_curthread();
if (check_stack(curthread, (void *) GET_STACK_JB(env)))
PANIC("_longjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
/*
* The stack pointer is somewhere within the threads stack.
* Jump to the users context.
*/
___longjmp(env, val);
}
/* Returns 0 if stack check is OK, non-zero otherwise. */
static inline int
check_stack(pthread_t thread, void *stackp)
{
void *stack_begin, *stack_end;
/* Get the bounds of the current threads stack. */
PTHREAD_ASSERT(thread->stack != NULL,
"Thread stack pointer is null");
stack_begin = thread->stack;
stack_end = stack_begin + thread->attr.stacksize_attr;
/*
* Make sure we aren't jumping to a different stack. Make sure
* jmp_stackp is between stack_begin and stack end, to correctly detect
* this condition regardless of whether the stack grows up or down.
*/
if (((stackp < stack_begin) && (stackp < stack_end)) ||
((stackp > stack_begin) && (stackp > stack_end)))
return (1);
else
return (0);
}
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