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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 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
29 #include <sys/param.h>
30 #include <sys/types.h>
31 #include <sys/sysmacros.h>
32 #include <sys/systm.h>
33 #include <sys/errno.h>
34 #include <sys/proc.h>
35 #include <sys/fault.h>
36 #include <sys/signal.h>
37 #include <sys/siginfo.h>
38 #include <sys/debug.h>
39
40 int
sigaltstack(struct sigaltstack * ssp,struct sigaltstack * oss)41 sigaltstack(struct sigaltstack *ssp, struct sigaltstack *oss)
42 {
43 klwp_t *lwp = ttolwp(curthread);
44 struct sigaltstack ss;
45
46 /*
47 * User's oss and ss might be the same address, so copyin first and
48 * save before copying out.
49 */
50 if (ssp) {
51 if (lwp->lwp_sigaltstack.ss_flags & SS_ONSTACK)
52 return (set_errno(EPERM));
53 if (copyin(ssp, &ss, sizeof (ss)))
54 return (set_errno(EFAULT));
55 if (ss.ss_flags & ~SS_DISABLE)
56 return (set_errno(EINVAL));
57 if (!(ss.ss_flags & SS_DISABLE) && ss.ss_size < MINSIGSTKSZ)
58 return (set_errno(ENOMEM));
59 }
60
61 if (oss) {
62 if (copyout(&lwp->lwp_sigaltstack,
63 oss, sizeof (struct sigaltstack)))
64 return (set_errno(EFAULT));
65 }
66
67 if (ssp)
68 lwp->lwp_sigaltstack = ss;
69
70 return (0);
71 }
72
73 #ifdef _LP64
74 int
sigaltstack32(struct sigaltstack32 * ssp,struct sigaltstack32 * oss)75 sigaltstack32(struct sigaltstack32 *ssp, struct sigaltstack32 *oss)
76 {
77 klwp_t *lwp = ttolwp(curthread);
78 struct sigaltstack *ss;
79 struct sigaltstack32 ss32, oss32;
80
81 /*
82 * User's oss and ss might be the same address, so copyin first and
83 * save before copying out.
84 */
85 if (ssp) {
86 if (lwp->lwp_sigaltstack.ss_flags & SS_ONSTACK)
87 return (set_errno(EPERM));
88 if (copyin(ssp, &ss32, sizeof (ss32)))
89 return (set_errno(EFAULT));
90 if (ss32.ss_flags & ~SS_DISABLE)
91 return (set_errno(EINVAL));
92 if (!(ss32.ss_flags & SS_DISABLE) && ss32.ss_size < MINSIGSTKSZ)
93 return (set_errno(ENOMEM));
94 }
95
96 if (oss) {
97 /*
98 * copy to ILP32 struct before copyout.
99 */
100 ss = &lwp->lwp_sigaltstack;
101 oss32.ss_sp = (caddr32_t)(uintptr_t)ss->ss_sp;
102 oss32.ss_size = (size32_t)ss->ss_size;
103 oss32.ss_flags = ss->ss_flags;
104
105 if (copyout(&oss32, oss, sizeof (oss32)))
106 return (set_errno(EFAULT));
107 }
108
109 if (ssp) {
110 ss = &lwp->lwp_sigaltstack;
111 ss->ss_sp = (void *)(uintptr_t)ss32.ss_sp;
112 ss->ss_size = (size_t)ss32.ss_size;
113 ss->ss_flags = ss32.ss_flags;
114 }
115
116 return (0);
117 }
118 #endif /* _LP64 */
119