linux_signal.c revision 38344 
1/*-
2 * Copyright (c) 1994-1995 S�ren Schmidt
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 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software withough specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *  $Id: linux_signal.c,v 1.11 1998/07/29 16:43:00 bde Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/sysproto.h>
34#include <sys/proc.h>
35#include <sys/signalvar.h>
36
37#include <i386/linux/linux.h>
38#include <i386/linux/linux_proto.h>
39#include <i386/linux/linux_util.h>
40
41static sigset_t
42linux_to_bsd_sigset(linux_sigset_t mask) {
43    int b, l;
44    sigset_t new = 0;
45
46    for (l = 1; l <= LINUX_NSIG; l++) {
47	if (mask & (1 << (l - 1))) {
48	    if ((b = linux_to_bsd_signal[l]))
49		new |= (1 << (b - 1));
50	}
51    }
52    return new;
53}
54
55static linux_sigset_t
56bsd_to_linux_sigset(sigset_t mask) {
57    int b, l;
58    sigset_t new = 0;
59
60    for (b = 1; b <= NSIG; b++) {
61	if (mask & (1 << (b - 1))) {
62	    if ((l = bsd_to_linux_signal[b]))
63		new |= (1 << (l - 1));
64	}
65    }
66    return new;
67}
68
69static void
70linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
71{
72    bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
73    bsa->sa_handler = lsa->sa_handler;
74    bsa->sa_flags = 0;
75    if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
76	bsa->sa_flags |= SA_NOCLDSTOP;
77    if (lsa->sa_flags & LINUX_SA_ONSTACK)
78	bsa->sa_flags |= SA_ONSTACK;
79    if (lsa->sa_flags & LINUX_SA_RESTART)
80	bsa->sa_flags |= SA_RESTART;
81    if (lsa->sa_flags & LINUX_SA_ONESHOT)
82	bsa->sa_flags |= SA_RESETHAND;
83    if (lsa->sa_flags & LINUX_SA_NOMASK)
84	bsa->sa_flags |= SA_NODEFER;
85}
86
87static void
88bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
89{
90    lsa->sa_handler = bsa->sa_handler;
91    lsa->sa_restorer = NULL;	/* unsupported */
92    lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
93    lsa->sa_flags = 0;
94    if (bsa->sa_flags & SA_NOCLDSTOP)
95	lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
96    if (bsa->sa_flags & SA_ONSTACK)
97	lsa->sa_flags |= LINUX_SA_ONSTACK;
98    if (bsa->sa_flags & SA_RESTART)
99	lsa->sa_flags |= LINUX_SA_RESTART;
100    if (bsa->sa_flags & SA_RESETHAND)
101	lsa->sa_flags |= LINUX_SA_ONESHOT;
102    if (bsa->sa_flags & SA_NODEFER)
103	lsa->sa_flags |= LINUX_SA_NOMASK;
104}
105
106int
107linux_sigaction(struct proc *p, struct linux_sigaction_args *args)
108{
109    linux_sigaction_t linux_sa;
110    struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
111    struct sigaction_args sa;
112    int error;
113    caddr_t sg = stackgap_init();
114
115#ifdef DEBUG
116    printf("Linux-emul(%ld): sigaction(%d, %p, %p)\n",
117	(long)p->p_pid, args->sig, (void *)args->nsa, (void *)args->osa);
118#endif
119
120    if (args->osa)
121	osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
122
123    if (args->nsa) {
124	nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
125	if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
126	    return error;
127	linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
128	if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
129	    return error;
130    }
131    sa.signum = linux_to_bsd_signal[args->sig];
132    sa.nsa = nsa;
133    sa.osa = osa;
134    if ((error = sigaction(p, &sa)))
135	return error;
136
137    if (args->osa) {
138	if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
139	    return error;
140	bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
141	if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
142	    return error;
143    }
144    return 0;
145}
146
147int
148linux_signal(struct proc *p, struct linux_signal_args *args)
149{
150    caddr_t sg;
151    struct sigaction_args sa_args;
152    struct sigaction *osa, *nsa, tmpsa;
153    int error;
154
155#ifdef DEBUG
156    printf("Linux-emul(%ld): signal(%d, %p)\n",
157	(long)p->p_pid, args->sig, (void *)args->handler);
158#endif
159    sg = stackgap_init();
160    nsa = stackgap_alloc(&sg, sizeof *nsa);
161    osa = stackgap_alloc(&sg, sizeof *osa);
162
163    tmpsa.sa_handler = args->handler;
164    tmpsa.sa_mask = (sigset_t) 0;
165    tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
166    if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
167	return error;
168
169    sa_args.signum = linux_to_bsd_signal[args->sig];
170    sa_args.osa = osa;
171    sa_args.nsa = nsa;
172    if ((error = sigaction(p, &sa_args)))
173	return error;
174
175    if ((error = copyin(osa, &tmpsa, sizeof *osa)))
176	return error;
177
178    p->p_retval[0] = (int)tmpsa.sa_handler;
179
180    return 0;
181}
182
183
184int
185linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
186{
187    int error, s;
188    sigset_t mask;
189    sigset_t omask;
190
191#ifdef DEBUG
192    printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
193#endif
194
195    p->p_retval[0] = 0;
196
197    if (args->omask != NULL) {
198	omask = bsd_to_linux_sigset(p->p_sigmask);
199	if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
200	    return error;
201    }
202    if (!(args->mask))
203	return 0;
204    if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
205	return error;
206
207    mask = linux_to_bsd_sigset(mask);
208    s = splhigh();
209    switch (args->how) {
210    case LINUX_SIG_BLOCK:
211	p->p_sigmask |= (mask & ~sigcantmask);
212	break;
213    case LINUX_SIG_UNBLOCK:
214	p->p_sigmask &= ~mask;
215	break;
216    case LINUX_SIG_SETMASK:
217	p->p_sigmask = (mask & ~sigcantmask);
218	break;
219    default:
220	error = EINVAL;
221	break;
222    }
223    splx(s);
224    return error;
225}
226
227int
228linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
229{
230#ifdef DEBUG
231    printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
232#endif
233    p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
234    return 0;
235}
236
237int
238linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
239{
240    int s;
241    sigset_t mask;
242
243#ifdef DEBUG
244    printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
245	(long)p->p_pid, (unsigned long)args->mask);
246#endif
247    p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
248
249    mask = linux_to_bsd_sigset(args->mask);
250    s = splhigh();
251    p->p_sigmask = mask & ~sigcantmask;
252    splx(s);
253    return 0;
254}
255
256int
257linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
258{
259    linux_sigset_t linux_sig;
260
261#ifdef DEBUG
262    printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
263#endif
264    linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
265    return copyout(&linux_sig, args->mask, sizeof(linux_sig));
266}
267
268/*
269 * Linux has two extra args, restart and oldmask.  We dont use these,
270 * but it seems that "restart" is actually a context pointer that
271 * enables the signal to happen with a different register set.
272 */
273int
274linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args)
275{
276    struct sigsuspend_args tmp;
277
278#ifdef DEBUG
279    printf("Linux-emul(%ld): sigsuspend(%08lx)\n",
280	(long)p->p_pid, (unsigned long)args->mask);
281#endif
282    tmp.mask = linux_to_bsd_sigset(args->mask);
283    return sigsuspend(p, &tmp);
284}
285
286int
287linux_pause(struct proc *p, struct linux_pause_args *args)
288{
289    struct sigsuspend_args tmp;
290
291#ifdef DEBUG
292    printf("Linux-emul(%d): pause()\n", p->p_pid);
293#endif
294    tmp.mask = p->p_sigmask;
295    return sigsuspend(p, &tmp);
296}
297
298int
299linux_kill(struct proc *p, struct linux_kill_args *args)
300{
301    struct kill_args /* {
302	int pid;
303	int signum;
304    } */ tmp;
305
306#ifdef DEBUG
307    printf("Linux-emul(%d): kill(%d, %d)\n",
308	   p->p_pid, args->pid, args->signum);
309#endif
310    tmp.pid = args->pid;
311    tmp.signum = linux_to_bsd_signal[args->signum];
312    return kill(p, &tmp);
313}
314