1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#ifndef _SYS_UCONTEXT_H
31#define	_SYS_UCONTEXT_H
32
33#include <sys/feature_tests.h>
34
35#include <sys/types.h>
36#include <sys/regset.h>
37#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
38#include <sys/signal.h>
39#endif
40
41#ifdef	__cplusplus
42extern "C" {
43#endif
44
45/*
46 * Inclusion of <sys/signal.h> for sigset_t and stack_t definitions
47 * breaks XPG4v2 namespace.  Therefore we must duplicate the defines
48 * for these types here when _XPG4_2 is defined.
49 */
50
51#if defined(_XPG4_2) && !defined(__EXTENSIONS__)
52#ifndef	_SIGSET_T
53#define	_SIGSET_T
54typedef	struct {	/* signal set type */
55	unsigned long	__sigbits[4];
56} sigset_t;
57#endif /* _SIGSET_T */
58
59#ifndef	_STACK_T
60#define	_STACK_T
61typedef	struct {
62	void	*ss_sp;
63	size_t	ss_size;
64	int	ss_flags;
65} stack_t;
66#endif /* _STACK_T */
67#endif /* defined(_XPG4_2) && !defined(__EXTENSIONS__) */
68
69#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
70typedef	struct ucontext ucontext_t;
71#else
72typedef	struct __ucontext ucontext_t;
73#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
74
75#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
76struct	ucontext {
77#else
78struct	__ucontext {
79#endif
80	unsigned long	uc_flags;
81	ucontext_t	*uc_link;
82	sigset_t   	uc_sigmask;
83	stack_t 	uc_stack;
84	mcontext_t 	uc_mcontext;
85	long		uc_filler[5];	/* see ABI spec for Intel386 */
86};
87
88#if defined(_SYSCALL32)
89
90/* Kernel view of user ILP32 ucontext structure */
91
92typedef struct ucontext32 {
93	uint32_t	uc_flags;
94	caddr32_t	uc_link;
95	sigset_t	uc_sigmask;
96	stack32_t	uc_stack;
97	mcontext32_t	uc_mcontext;
98	int32_t		uc_filler[5];
99} ucontext32_t;
100
101#if defined(_KERNEL)
102extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
103extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
104#endif
105
106#endif	/* _SYSCALL32 */
107
108#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
109#define	GETCONTEXT	0
110#define	SETCONTEXT	1
111#define	GETUSTACK	2
112#define	SETUSTACK	3
113
114/*
115 * values for uc_flags
116 * these are implementation dependent flags, that should be hidden
117 * from the user interface, defining which elements of ucontext
118 * are valid, and should be restored on call to setcontext
119 */
120
121#define	UC_SIGMASK	0x01
122#define	UC_STACK	0x02
123#define	UC_CPU		0x04
124#define	UC_MAU		0x08
125#define	UC_FPU		UC_MAU
126
127#define	UC_MCONTEXT	(UC_CPU|UC_FPU)
128
129/*
130 * UC_ALL specifies the default context
131 */
132
133#define	UC_ALL		(UC_SIGMASK|UC_STACK|UC_MCONTEXT)
134#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
135
136#ifdef _KERNEL
137void savecontext(ucontext_t *, const k_sigset_t *);
138void restorecontext(ucontext_t *);
139
140#ifdef _SYSCALL32
141extern void savecontext32(ucontext32_t *, const k_sigset_t *);
142#endif
143#endif
144
145#ifdef	__cplusplus
146}
147#endif
148
149#endif /* _SYS_UCONTEXT_H */
150