1/*-
2 * Copyright (c) 1999 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef _SYS_UCONTEXT_H_
32#define	_SYS_UCONTEXT_H_
33
34#include <sys/signal.h>
35#include <machine/ucontext.h>
36
37typedef struct __ucontext {
38	/*
39	 * Keep the order of the first two fields. Also,
40	 * keep them the first two fields in the structure.
41	 * This way we can have a union with struct
42	 * sigcontext and ucontext_t. This allows us to
43	 * support them both at the same time.
44	 * note: the union is not defined, though.
45	 */
46	sigset_t	uc_sigmask;
47	mcontext_t	uc_mcontext;
48
49	struct __ucontext *uc_link;
50	stack_t		uc_stack;
51	int		uc_flags;
52#define	UCF_SWAPPED	0x00000001	/* Used by swapcontext(3). */
53	int		__spare__[4];
54} ucontext_t;
55
56#if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
57#if defined(__i386__)
58struct ucontext4 {
59	sigset_t	uc_sigmask;
60	struct mcontext4 uc_mcontext;
61	struct ucontext4 *uc_link;
62	stack_t		uc_stack;
63	int		__spare__[8];
64};
65#else	/* __i386__ */
66#define ucontext4 ucontext
67#endif	/* __i386__ */
68#endif	/* _KERNEL */
69
70#ifndef _KERNEL
71
72__BEGIN_DECLS
73
74int	getcontext(ucontext_t *) __returns_twice;
75ucontext_t *getcontextx(void);
76int	setcontext(const ucontext_t *);
77void	makecontext(ucontext_t *, void (*)(void), int, ...);
78int	signalcontext(ucontext_t *, int, __sighandler_t *);
79int	swapcontext(ucontext_t *, const ucontext_t *);
80
81#if __BSD_VISIBLE
82int __getcontextx_size(void);
83int __fillcontextx(char *ctx) __returns_twice;
84int __fillcontextx2(char *ctx);
85#endif
86
87__END_DECLS
88
89#else /* _KERNEL */
90
91struct thread;
92
93/*
94 * Flags for get_mcontext().  The low order 4 bits (i.e a mask of 0x0f) are
95 * reserved for use by machine independent code.  All other bits are for use
96 * by machine dependent code.
97 */
98#define	GET_MC_CLEAR_RET	1
99
100/* Machine-dependent functions: */
101int	get_mcontext(struct thread *, mcontext_t *, int);
102int	set_mcontext(struct thread *, const mcontext_t *);
103
104#endif /* !_KERNEL */
105
106#endif /* !_SYS_UCONTEXT_H_ */
107