119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/*
|
|
* 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 <machine/reg.h>
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
/* Prototypes: */
|
|
static inline int check_stack(pthread_t thread, void *stackp);
|
|
|
|
__weak_reference(_thread_siglongjmp, siglongjmp);
|
|
__weak_reference(_thread_longjmp, longjmp);
|
|
__weak_reference(__thread_longjmp, _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);
|
|
}
|