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 2015 Nexenta Systems, Inc.  All rights reserved.
24 *
25 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
26 * Use is subject to license terms.
27 */
28
29/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
30/*	  All Rights Reserved	*/
31
32#ifndef _SYS_UCONTEXT_H
33#define	_SYS_UCONTEXT_H
34
35#include <sys/feature_tests.h>
36
37#include <sys/types.h>
38#include <sys/mcontext.h>
39#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
40#include <sys/signal.h>
41#endif
42
43#ifdef	__cplusplus
44extern "C" {
45#endif
46
47/*
48 * Inclusion of <sys/signal.h> for sigset_t and stack_t definitions
49 * breaks XPG4v2 namespace.  Therefore we must duplicate the defines
50 * for these types here when _XPG4_2 is defined.
51 */
52
53#if defined(_XPG4_2) && !defined(__EXTENSIONS__)
54#ifndef	_SIGSET_T
55#define	_SIGSET_T
56typedef	struct {	/* signal set type */
57	unsigned long	__sigbits[4];
58} sigset_t;
59#endif /* _SIGSET_T */
60
61#ifndef	_STACK_T
62#define	_STACK_T
63typedef	struct {
64	void	*ss_sp;
65	size_t	ss_size;
66	int	ss_flags;
67} stack_t;
68#endif /* _STACK_T */
69#endif /* defined(_XPG4_2) && !defined(__EXTENSIONS__) */
70
71#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
72typedef	struct ucontext ucontext_t;
73#else
74typedef	struct __ucontext ucontext_t;
75#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
76
77#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
78struct	ucontext {
79#else
80struct	__ucontext {
81#endif
82	unsigned long	uc_flags;
83	ucontext_t	*uc_link;
84	sigset_t   	uc_sigmask;
85	stack_t 	uc_stack;
86	mcontext_t 	uc_mcontext;
87	long		uc_filler[5];	/* see ABI spec for Intel386 */
88};
89
90#if defined(_SYSCALL32)
91
92/* Kernel view of user ILP32 ucontext structure */
93
94typedef struct ucontext32 {
95	uint32_t	uc_flags;
96	caddr32_t	uc_link;
97	sigset_t	uc_sigmask;
98	stack32_t	uc_stack;
99	mcontext32_t	uc_mcontext;
100	int32_t		uc_filler[5];
101} ucontext32_t;
102
103#if defined(_KERNEL)
104extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
105extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
106#endif
107
108#endif	/* _SYSCALL32 */
109
110#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
111#define	GETCONTEXT	0
112#define	SETCONTEXT	1
113#define	GETUSTACK	2
114#define	SETUSTACK	3
115
116/*
117 * values for uc_flags
118 * these are implementation dependent flags, that should be hidden
119 * from the user interface, defining which elements of ucontext
120 * are valid, and should be restored on call to setcontext
121 */
122
123#define	UC_SIGMASK	0x01
124#define	UC_STACK	0x02
125#define	UC_CPU		0x04
126#define	UC_MAU		0x08
127#define	UC_FPU		UC_MAU
128
129#define	UC_MCONTEXT	(UC_CPU|UC_FPU)
130
131/*
132 * UC_ALL specifies the default context
133 */
134
135#define	UC_ALL		(UC_SIGMASK|UC_STACK|UC_MCONTEXT)
136#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
137
138#ifdef _KERNEL
139void savecontext(ucontext_t *, const k_sigset_t *);
140void restorecontext(ucontext_t *);
141
142#ifdef _SYSCALL32
143extern void savecontext32(ucontext32_t *, const k_sigset_t *);
144#endif
145#endif
146
147#ifdef	__cplusplus
148}
149#endif
150
151#endif /* _SYS_UCONTEXT_H */
152