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 $
32 * $DragonFly: src/lib/libc_r/uthread/uthread_jmp.c,v 1.3 2007/04/29 01:10:33 dillon Exp $
35 #include <sys/user.h> /* MUST BE FIRST */
38 #include <sys/param.h>
39 #include <machine/reg.h>
41 #include "pthread_private.h"
44 static inline int check_stack(pthread_t thread
, void *stackp
);
47 siglongjmp(sigjmp_buf env
, int savemask
)
49 struct pthread
*curthread
= _get_curthread();
51 if (check_stack(curthread
, (void *) GET_STACK_SJB(env
)))
52 PANIC("siglongjmp()ing between thread contexts is undefined by "
56 * The stack pointer is somewhere within the threads stack.
57 * Jump to the users context.
59 __siglongjmp(env
, savemask
);
63 longjmp(jmp_buf env
, int val
)
65 struct pthread
*curthread
= _get_curthread();
67 if (check_stack(curthread
, (void *) GET_STACK_JB(env
)))
68 PANIC("longjmp()ing between thread contexts is undefined by "
72 * The stack pointer is somewhere within the threads stack.
73 * Jump to the users context.
79 _longjmp(jmp_buf env
, int val
)
81 struct pthread
*curthread
= _get_curthread();
83 if (check_stack(curthread
, (void *) GET_STACK_JB(env
)))
84 PANIC("_longjmp()ing between thread contexts is undefined by "
88 * The stack pointer is somewhere within the threads stack.
89 * Jump to the users context.
94 /* Returns 0 if stack check is OK, non-zero otherwise. */
96 check_stack(pthread_t thread
, void *stackp
)
98 void *stack_begin
, *stack_end
;
100 /* Get the bounds of the current threads stack. */
101 PTHREAD_ASSERT(thread
->stack
!= NULL
,
102 "Thread stack pointer is null");
103 stack_begin
= thread
->stack
;
104 stack_end
= stack_begin
+ thread
->attr
.stacksize_attr
;
107 * Make sure we aren't jumping to a different stack. Make sure
108 * jmp_stackp is between stack_begin and stack end, to correctly detect
109 * this condition regardless of whether the stack grows up or down.
111 if (((stackp
< stack_begin
) && (stackp
< stack_end
)) ||
112 ((stackp
> stack_begin
) && (stackp
> stack_end
)))