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/*
* Copyright (C) 2000 Jason Evans <jasone@canonware.com>.
* 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>
#ifdef _THREAD_SAFE
#include <machine/reg.h>
#include <pthread.h>
#include "pthread_private.h"
/*
* Offset into the jmp_buf. This is highly machine-dependent, but is a
* necessary evil in order to compare stack pointers and make decisions based on
* where a *longjmp() is jumping to.
*/
#if defined(__i386__)
#define JMP_BUF_SP_OFFSET 2
#elif defined(__alpha)
#define JMP_BUF_SP_OFFSET (4 + R_SP)
#else
#error "Don't recognize this architecture!"
#endif
void
siglongjmp(sigjmp_buf env, int savemask)
{
void *jmp_stackp;
void *stack_begin, *stack_end;
if (_thread_run->signal_nest_level == 0)
__siglongjmp(env, savemask);
/* Get the stack pointer from the jump buffer. */
jmp_stackp = (void *)env->_sjb[JMP_BUF_SP_OFFSET];
/* Get the bounds of the current threads stack. */
if (_thread_run->stack != NULL) {
stack_begin = _thread_run->stack;
stack_end = stack_begin + _thread_run->attr.stacksize_attr;
} else {
stack_end = (void *)USRSTACK;
stack_begin = stack_end - PTHREAD_STACK_INITIAL;
}
/*
* 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 (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
PANIC("siglongjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
memcpy(_thread_run->nested_jmp.sigjmp, env,
sizeof(_thread_run->nested_jmp.sigjmp));
/*
* Only save oldstate once so that dispatching multiple signals will not
* lose the thread's original state.
*/
if (_thread_run->jmpflags == JMPFLAGS_NONE)
_thread_run->oldstate = _thread_run->state;
PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
_thread_run->jmpflags = JMPFLAGS_SIGLONGJMP;
_thread_run->longjmp_val = savemask;
___longjmp(*_thread_run->sighandler_jmp_buf, 1);
}
void
longjmp(jmp_buf env, int val)
{
void *jmp_stackp;
void *stack_begin, *stack_end;
if (_thread_run->signal_nest_level == 0)
__longjmp(env, val);
/* Get the stack pointer from the jump buffer. */
jmp_stackp = (void *)env->_jb[JMP_BUF_SP_OFFSET];
/* Get the bounds of the current threads stack. */
if (_thread_run->stack != NULL) {
stack_begin = _thread_run->stack;
stack_end = stack_begin + _thread_run->attr.stacksize_attr;
} else {
stack_end = (void *)USRSTACK;
stack_begin = stack_end - PTHREAD_STACK_INITIAL;
}
/*
* 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 (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
PANIC("longjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
memcpy(_thread_run->nested_jmp.jmp, env,
sizeof(_thread_run->nested_jmp.jmp));
/*
* Only save oldstate once so that dispatching multiple signals will not
* lose the thread's original state.
*/
if (_thread_run->jmpflags == JMPFLAGS_NONE)
_thread_run->oldstate = _thread_run->state;
PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
_thread_run->jmpflags = JMPFLAGS_LONGJMP;
_thread_run->longjmp_val = val;
___longjmp(*_thread_run->sighandler_jmp_buf, 1);
}
void
_longjmp(jmp_buf env, int val)
{
void *jmp_stackp;
void *stack_begin, *stack_end;
if (_thread_run->signal_nest_level == 0)
___longjmp(env, val);
/* Get the stack pointer from the jump buffer. */
jmp_stackp = (void *)env->_jb[JMP_BUF_SP_OFFSET];
/* Get the bounds of the current threads stack. */
if (_thread_run->stack != NULL) {
stack_begin = _thread_run->stack;
stack_end = stack_begin + _thread_run->attr.stacksize_attr;
} else {
stack_end = (void *)USRSTACK;
stack_begin = stack_end - PTHREAD_STACK_INITIAL;
}
/*
* 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 (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
PANIC("_longjmp()ing between thread contexts is undefined by "
"POSIX 1003.1");
memcpy(_thread_run->nested_jmp.jmp, env,
sizeof(_thread_run->nested_jmp.jmp));
/*
* Only save oldstate once so that dispatching multiple signals will not
* lose the thread's original state.
*/
if (_thread_run->jmpflags == JMPFLAGS_NONE)
_thread_run->oldstate = _thread_run->state;
PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
_thread_run->jmpflags = JMPFLAGS__LONGJMP;
_thread_run->longjmp_val = val;
___longjmp(*_thread_run->sighandler_jmp_buf, 1);
}
#endif
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