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 Joyent, Inc.
24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 *
26 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
31 /* All Rights Reserved */
32
33 #ifndef _SYS_UCONTEXT_H
34 #define _SYS_UCONTEXT_H
35
36 #include <sys/feature_tests.h>
37
38 #include <sys/types.h>
39 #include <sys/mcontext.h>
40 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
41 #include <sys/signal.h>
42 #endif
43
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47
48 /*
49 * Inclusion of <sys/signal.h> for sigset_t and stack_t definitions
50 * breaks XPG4v2 namespace. Therefore we must duplicate the defines
51 * for these types here when _XPG4_2 is defined.
52 */
53
54 #if defined(_XPG4_2) && !defined(__EXTENSIONS__)
55 #ifndef _SIGSET_T
56 #define _SIGSET_T
57 typedef struct { /* signal set type */
58 unsigned long __sigbits[4];
59 } sigset_t;
60 #endif /* _SIGSET_T */
61
62 #ifndef _STACK_T
63 #define _STACK_T
64 typedef struct {
65 void *ss_sp;
66 size_t ss_size;
67 int ss_flags;
68 } stack_t;
69 #endif /* _STACK_T */
70 #endif /* defined(_XPG4_2) && !defined(__EXTENSIONS__) */
71
72 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
73 typedef struct ucontext ucontext_t;
74 #else
75 typedef struct __ucontext ucontext_t;
76 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
77
78 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
79 struct ucontext {
80 #else
81 struct __ucontext {
82 #endif
83 unsigned long uc_flags;
84 ucontext_t *uc_link;
85 sigset_t uc_sigmask;
86 stack_t uc_stack;
87 mcontext_t uc_mcontext;
88 /*
89 * The Intel386 ABI specification includes a 5-element array of longs
90 * called "uc_filler", padding the size of the struct to 512 bytes. To
91 * allow zone brands to communicate extra data right the way through
92 * the signal handling process, from sigacthandler to setcontext, we
93 * steal the first three of these longs as a brand-private member.
94 */
95 void *uc_brand_data[3];
96 long uc_filler[2];
97 };
98 #if defined(_SYSCALL32)
99
100 /* Kernel view of user ILP32 ucontext structure */
101
102 typedef struct ucontext32 {
103 uint32_t uc_flags;
104 caddr32_t uc_link;
105 sigset_t uc_sigmask;
106 stack32_t uc_stack;
107 mcontext32_t uc_mcontext;
108 caddr32_t uc_brand_data[3];
109 int32_t uc_filler[2];
110 } ucontext32_t;
111
112 #if defined(_KERNEL)
113 extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
114 extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
115 #endif
116
117 #endif /* _SYSCALL32 */
118
119 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
120 #define GETCONTEXT 0
121 #define SETCONTEXT 1
122 #define GETUSTACK 2
123 #define SETUSTACK 3
124
125 /*
126 * values for uc_flags
127 * these are implementation dependent flags, that should be hidden
128 * from the user interface, defining which elements of ucontext
129 * are valid, and should be restored on call to setcontext
130 */
131
132 #define UC_SIGMASK 0x01
133 #define UC_STACK 0x02
134 #define UC_CPU 0x04
135 #define UC_MAU 0x08
136 #define UC_FPU UC_MAU
137
138 #define UC_MCONTEXT (UC_CPU|UC_FPU)
139
140 /*
141 * UC_ALL specifies the default context
142 */
143
144 #define UC_ALL (UC_SIGMASK|UC_STACK|UC_MCONTEXT)
145 #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
146
147 #ifdef _KERNEL
148 void savecontext(ucontext_t *, const k_sigset_t *);
149 void restorecontext(ucontext_t *);
150
151 #ifdef _SYSCALL32
152 extern void savecontext32(ucontext32_t *, const k_sigset_t *);
153 #endif
154 #endif
155
156 #ifdef __cplusplus
157 }
158 #endif
159
160 #endif /* _SYS_UCONTEXT_H */