194 lines
6.4 KiB
C
194 lines
6.4 KiB
C
/*
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* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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* All rights reserved.
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* Copyright (C) 2000 Daniel M. Eischen <eischen@vigrid.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <unistd.h>
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#include <setjmp.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#ifdef _THREAD_SAFE
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#include <machine/reg.h>
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#include <pthread.h>
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#include "pthread_private.h"
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/*
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* Offset into the jmp_buf. This is highly machine-dependent, but is a
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* necessary evil in order to compare stack pointers and make decisions based on
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* where a *longjmp() is jumping to.
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*/
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#if defined(__i386__)
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#define JMP_BUF_SP_OFFSET 2
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#elif defined(__alpha)
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#define JMP_BUF_SP_OFFSET (4 + R_SP)
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#else
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#error "Don't recognize this architecture!"
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#endif
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void
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siglongjmp(sigjmp_buf env, int savemask)
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{
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void *jmp_stackp;
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void *stack_begin, *stack_end;
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if (_thread_run->signal_nest_level == 0)
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__siglongjmp(env, savemask);
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/* Get the stack pointer from the jump buffer. */
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jmp_stackp = (void *)env->_sjb[JMP_BUF_SP_OFFSET];
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/* Get the bounds of the current threads stack. */
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if (_thread_run->stack != NULL) {
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stack_begin = _thread_run->stack;
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stack_end = stack_begin + _thread_run->attr.stacksize_attr;
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} else {
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stack_end = (void *)USRSTACK;
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stack_begin = stack_end - PTHREAD_STACK_INITIAL;
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}
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/*
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* Make sure we aren't jumping to a different stack. Make sure
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* jmp_stackp is between stack_begin and stack end, to correctly detect
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* this condition regardless of whether the stack grows up or down.
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*/
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if (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
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((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
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PANIC("siglongjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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memcpy(_thread_run->nested_jmp.sigjmp, env,
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sizeof(_thread_run->nested_jmp.sigjmp));
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/*
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* Only save oldstate once so that dispatching multiple signals will not
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* lose the thread's original state.
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*/
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if (_thread_run->jmpflags == JMPFLAGS_NONE)
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_thread_run->oldstate = _thread_run->state;
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PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
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_thread_run->jmpflags = JMPFLAGS_SIGLONGJMP;
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_thread_run->longjmp_val = savemask;
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___longjmp(*_thread_run->sighandler_jmp_buf, 1);
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}
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void
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longjmp(jmp_buf env, int val)
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{
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void *jmp_stackp;
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void *stack_begin, *stack_end;
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if (_thread_run->signal_nest_level == 0)
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__longjmp(env, val);
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/* Get the stack pointer from the jump buffer. */
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jmp_stackp = (void *)env->_jb[JMP_BUF_SP_OFFSET];
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/* Get the bounds of the current threads stack. */
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if (_thread_run->stack != NULL) {
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stack_begin = _thread_run->stack;
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stack_end = stack_begin + _thread_run->attr.stacksize_attr;
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} else {
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stack_end = (void *)USRSTACK;
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stack_begin = stack_end - PTHREAD_STACK_INITIAL;
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}
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/*
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* Make sure we aren't jumping to a different stack. Make sure
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* jmp_stackp is between stack_begin and stack end, to correctly detect
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* this condition regardless of whether the stack grows up or down.
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*/
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if (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
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((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
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PANIC("longjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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memcpy(_thread_run->nested_jmp.jmp, env,
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sizeof(_thread_run->nested_jmp.jmp));
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/*
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* Only save oldstate once so that dispatching multiple signals will not
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* lose the thread's original state.
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*/
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if (_thread_run->jmpflags == JMPFLAGS_NONE)
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_thread_run->oldstate = _thread_run->state;
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PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
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_thread_run->jmpflags = JMPFLAGS_LONGJMP;
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_thread_run->longjmp_val = val;
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___longjmp(*_thread_run->sighandler_jmp_buf, 1);
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}
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void
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_longjmp(jmp_buf env, int val)
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{
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void *jmp_stackp;
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void *stack_begin, *stack_end;
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if (_thread_run->signal_nest_level == 0)
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___longjmp(env, val);
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/* Get the stack pointer from the jump buffer. */
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jmp_stackp = (void *)env->_jb[JMP_BUF_SP_OFFSET];
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/* Get the bounds of the current threads stack. */
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if (_thread_run->stack != NULL) {
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stack_begin = _thread_run->stack;
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stack_end = stack_begin + _thread_run->attr.stacksize_attr;
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} else {
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stack_end = (void *)USRSTACK;
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stack_begin = stack_end - PTHREAD_STACK_INITIAL;
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}
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/*
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* Make sure we aren't jumping to a different stack. Make sure
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* jmp_stackp is between stack_begin and stack end, to correctly detect
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* this condition regardless of whether the stack grows up or down.
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*/
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if (((jmp_stackp < stack_begin) && (jmp_stackp < stack_end)) ||
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((jmp_stackp > stack_begin) && (jmp_stackp > stack_end)))
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PANIC("_longjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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memcpy(_thread_run->nested_jmp.jmp, env,
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sizeof(_thread_run->nested_jmp.jmp));
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/*
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* Only save oldstate once so that dispatching multiple signals will not
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* lose the thread's original state.
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*/
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if (_thread_run->jmpflags == JMPFLAGS_NONE)
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_thread_run->oldstate = _thread_run->state;
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PTHREAD_SET_STATE(_thread_run, PS_RUNNING);
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_thread_run->jmpflags = JMPFLAGS__LONGJMP;
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_thread_run->longjmp_val = val;
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___longjmp(*_thread_run->sighandler_jmp_buf, 1);
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}
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#endif
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