2 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
4 * Copyright (C) 2000 Daniel M. Eischen <eischen@vigrid.com>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice(s), this list of conditions and the following disclaimer as
12 * the first lines of this file unmodified other than the possible
13 * addition of one or more copyright notices.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice(s), this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
26 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
28 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * $FreeBSD: src/lib/libc_r/uthread/uthread_jmp.c,v 1.2.2.4 2002/10/22 14:44:03 fjoe Exp $
36 #include <sys/param.h>
38 #include <machine/reg.h>
40 #include "pthread_private.h"
43 static inline int check_stack(pthread_t thread, void *stackp);
46 siglongjmp(sigjmp_buf env, int savemask)
48 struct pthread *curthread = _get_curthread();
50 if (check_stack(curthread, (void *) GET_STACK_SJB(env)))
51 PANIC("siglongjmp()ing between thread contexts is undefined by "
55 * The stack pointer is somewhere within the threads stack.
56 * Jump to the users context.
58 __siglongjmp(env, savemask);
62 longjmp(jmp_buf env, int val)
64 struct pthread *curthread = _get_curthread();
66 if (check_stack(curthread, (void *) GET_STACK_JB(env)))
67 PANIC("longjmp()ing between thread contexts is undefined by "
71 * The stack pointer is somewhere within the threads stack.
72 * Jump to the users context.
78 _longjmp(jmp_buf env, int val)
80 struct pthread *curthread = _get_curthread();
82 if (check_stack(curthread, (void *) GET_STACK_JB(env)))
83 PANIC("_longjmp()ing between thread contexts is undefined by "
87 * The stack pointer is somewhere within the threads stack.
88 * Jump to the users context.
93 /* Returns 0 if stack check is OK, non-zero otherwise. */
95 check_stack(pthread_t thread, void *stackp)
97 void *stack_begin, *stack_end;
99 /* Get the bounds of the current threads stack. */
100 PTHREAD_ASSERT(thread->stack != NULL,
101 "Thread stack pointer is null");
102 stack_begin = thread->stack;
103 stack_end = stack_begin + thread->attr.stacksize_attr;
106 * Make sure we aren't jumping to a different stack. Make sure
107 * jmp_stackp is between stack_begin and stack end, to correctly detect
108 * this condition regardless of whether the stack grows up or down.
110 if (((stackp < stack_begin) && (stackp < stack_end)) ||
111 ((stackp > stack_begin) && (stackp > stack_end)))