1/*-
2 * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
| 1/*-
2 * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
|
25 *
| |
26 */
| 25 */
|
27/*
28 * $FreeBSD: head/sys/kern/kern_context.c 113998 2003-04-25 01:50:30Z deischen $
29 */
| |
30
| 26
|
| 27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/kern/kern_context.c 116182 2003-06-11 00:56:59Z obrien $");
29
|
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/lock.h>
34#include <sys/mutex.h>
35#include <sys/proc.h>
36#include <sys/sysent.h>
37#include <sys/systm.h>
38#include <sys/sysproto.h>
39#include <sys/signalvar.h>
40#include <sys/ucontext.h>
41
42/*
43 * The first two fields of a ucontext_t are the signal mask and
44 * the machine context. The next field is uc_link; we want to
45 * avoid destroying the link when copying out contexts.
46 */
47#define UC_COPY_SIZE offsetof(ucontext_t, uc_link)
48
49#ifndef _SYS_SYSPROTO_H_
50struct getcontext_args {
51 struct __ucontext *ucp;
52}
53struct setcontext_args {
54 const struct __ucontext_t *ucp;
55}
56struct swapcontext_args {
57 struct __ucontext *oucp;
58 const struct __ucontext_t *ucp;
59}
60#endif
61
62/*
63 * MPSAFE
64 */
65int
66getcontext(struct thread *td, struct getcontext_args *uap)
67{
68 ucontext_t uc;
69 int ret;
70
71 if (uap->ucp == NULL)
72 ret = EINVAL;
73 else {
74 get_mcontext(td, &uc.uc_mcontext, 1);
75 PROC_LOCK(td->td_proc);
76 uc.uc_sigmask = td->td_sigmask;
77 PROC_UNLOCK(td->td_proc);
78 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
79 }
80 return (ret);
81}
82
83/*
84 * MPSAFE
85 */
86int
87setcontext(struct thread *td, struct setcontext_args *uap)
88{
89 ucontext_t uc;
90 int ret;
91
92 if (uap->ucp == NULL)
93 ret = EINVAL;
94 else {
95 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
96 if (ret == 0) {
97 ret = set_mcontext(td, &uc.uc_mcontext);
98 if (ret == 0) {
99 SIG_CANTMASK(uc.uc_sigmask);
100 PROC_LOCK(td->td_proc);
101 td->td_sigmask = uc.uc_sigmask;
102 PROC_UNLOCK(td->td_proc);
103 }
104 }
105 }
106 return (ret == 0 ? EJUSTRETURN : ret);
107}
108
109int
110swapcontext(struct thread *td, struct swapcontext_args *uap)
111{
112 ucontext_t uc;
113 int ret;
114
115 if (uap->oucp == NULL || uap->ucp == NULL)
116 ret = EINVAL;
117 else {
118 get_mcontext(td, &uc.uc_mcontext, 1);
119 PROC_LOCK(td->td_proc);
120 uc.uc_sigmask = td->td_sigmask;
121 PROC_UNLOCK(td->td_proc);
122 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
123 if (ret == 0) {
124 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
125 if (ret == 0) {
126 ret = set_mcontext(td, &uc.uc_mcontext);
127 if (ret == 0) {
128 SIG_CANTMASK(uc.uc_sigmask);
129 PROC_LOCK(td->td_proc);
130 td->td_sigmask = uc.uc_sigmask;
131 PROC_UNLOCK(td->td_proc);
132 }
133 }
134 }
135 }
136 return (ret == 0 ? EJUSTRETURN : ret);
137}
| 30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/mutex.h>
34#include <sys/proc.h>
35#include <sys/sysent.h>
36#include <sys/systm.h>
37#include <sys/sysproto.h>
38#include <sys/signalvar.h>
39#include <sys/ucontext.h>
40
41/*
42 * The first two fields of a ucontext_t are the signal mask and
43 * the machine context. The next field is uc_link; we want to
44 * avoid destroying the link when copying out contexts.
45 */
46#define UC_COPY_SIZE offsetof(ucontext_t, uc_link)
47
48#ifndef _SYS_SYSPROTO_H_
49struct getcontext_args {
50 struct __ucontext *ucp;
51}
52struct setcontext_args {
53 const struct __ucontext_t *ucp;
54}
55struct swapcontext_args {
56 struct __ucontext *oucp;
57 const struct __ucontext_t *ucp;
58}
59#endif
60
61/*
62 * MPSAFE
63 */
64int
65getcontext(struct thread *td, struct getcontext_args *uap)
66{
67 ucontext_t uc;
68 int ret;
69
70 if (uap->ucp == NULL)
71 ret = EINVAL;
72 else {
73 get_mcontext(td, &uc.uc_mcontext, 1);
74 PROC_LOCK(td->td_proc);
75 uc.uc_sigmask = td->td_sigmask;
76 PROC_UNLOCK(td->td_proc);
77 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
78 }
79 return (ret);
80}
81
82/*
83 * MPSAFE
84 */
85int
86setcontext(struct thread *td, struct setcontext_args *uap)
87{
88 ucontext_t uc;
89 int ret;
90
91 if (uap->ucp == NULL)
92 ret = EINVAL;
93 else {
94 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
95 if (ret == 0) {
96 ret = set_mcontext(td, &uc.uc_mcontext);
97 if (ret == 0) {
98 SIG_CANTMASK(uc.uc_sigmask);
99 PROC_LOCK(td->td_proc);
100 td->td_sigmask = uc.uc_sigmask;
101 PROC_UNLOCK(td->td_proc);
102 }
103 }
104 }
105 return (ret == 0 ? EJUSTRETURN : ret);
106}
107
108int
109swapcontext(struct thread *td, struct swapcontext_args *uap)
110{
111 ucontext_t uc;
112 int ret;
113
114 if (uap->oucp == NULL || uap->ucp == NULL)
115 ret = EINVAL;
116 else {
117 get_mcontext(td, &uc.uc_mcontext, 1);
118 PROC_LOCK(td->td_proc);
119 uc.uc_sigmask = td->td_sigmask;
120 PROC_UNLOCK(td->td_proc);
121 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
122 if (ret == 0) {
123 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
124 if (ret == 0) {
125 ret = set_mcontext(td, &uc.uc_mcontext);
126 if (ret == 0) {
127 SIG_CANTMASK(uc.uc_sigmask);
128 PROC_LOCK(td->td_proc);
129 td->td_sigmask = uc.uc_sigmask;
130 PROC_UNLOCK(td->td_proc);
131 }
132 }
133 }
134 }
135 return (ret == 0 ? EJUSTRETURN : ret);
136}
|