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 * Copyright 2015 Joyent, Inc.
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
44 extern "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
56 typedef 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
63 typedef 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__)
72 typedef struct ucontext ucontext_t;
73 #else
74 typedef struct __ucontext ucontext_t;
75 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
76
77 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
78 struct ucontext {
79 #else
80 struct __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 /*
88 * The Intel386 ABI specification includes a 5-element array of longs
89 * called "uc_filler", padding the size of the struct to 512 bytes. To
90 * allow zone brands to communicate extra data right the way through
91 * the signal handling process, from sigacthandler to setcontext, we
92 * steal the first three of these longs as a brand-private member.
93 */
94 void *uc_brand_data[3];
95 long uc_filler[2];
96 };
97 #if defined(_SYSCALL32)
98
99 /* Kernel view of user ILP32 ucontext structure */
100
101 typedef struct ucontext32 {
102 uint32_t uc_flags;
103 caddr32_t uc_link;
104 sigset_t uc_sigmask;
105 stack32_t uc_stack;
106 mcontext32_t uc_mcontext;
107 caddr32_t uc_brand_data[3];
108 int32_t uc_filler[2];
109 } ucontext32_t;
110
111 #if defined(_KERNEL)
112 extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
113 extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
114 #endif
115
116 #endif /* _SYSCALL32 */
117
118 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
119 #define GETCONTEXT 0
120 #define SETCONTEXT 1
121 #define GETUSTACK 2
122 #define SETUSTACK 3
123
124 /*
125 * values for uc_flags
126 * these are implementation dependent flags, that should be hidden
127 * from the user interface, defining which elements of ucontext
128 * are valid, and should be restored on call to setcontext
129 */
130
131 #define UC_SIGMASK 0x01
132 #define UC_STACK 0x02
133 #define UC_CPU 0x04
134 #define UC_MAU 0x08
135 #define UC_FPU UC_MAU
136
137 #define UC_MCONTEXT (UC_CPU|UC_FPU)
138
139 /*
140 * UC_ALL specifies the default context
141 */
142
143 #define UC_ALL (UC_SIGMASK|UC_STACK|UC_MCONTEXT)
144 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
145
146 #ifdef _KERNEL
147 void savecontext(ucontext_t *, const k_sigset_t *);
148 void restorecontext(ucontext_t *);
149
150 #ifdef _SYSCALL32
151 extern void savecontext32(ucontext32_t *, const k_sigset_t *);
152 #endif
153 #endif
154
155 #ifdef __cplusplus
156 }
157 #endif
158
159 #endif /* _SYS_UCONTEXT_H */