linux_signal.c revision 41986 
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 1.13 1998/10/11 04:54:16 jdp 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    if (args->sig <= 0 || args->sig >= LINUX_NSIG)
120	return EINVAL;
121    if (args->osa)
122	osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
123
124    if (args->nsa) {
125	nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
126	if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
127	    return error;
128	linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
129	if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
130	    return error;
131    }
132    sa.signum = linux_to_bsd_signal[args->sig];
133    sa.nsa = nsa;
134    sa.osa = osa;
135    if ((error = sigaction(p, &sa)))
136	return error;
137
138    if (args->osa) {
139	if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
140	    return error;
141	bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
142	if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
143	    return error;
144    }
145    return 0;
146}
147
148int
149linux_signal(struct proc *p, struct linux_signal_args *args)
150{
151    caddr_t sg;
152    struct sigaction_args sa_args;
153    struct sigaction *osa, *nsa, tmpsa;
154    int error;
155
156#ifdef DEBUG
157    printf("Linux-emul(%ld): signal(%d, %p)\n",
158	(long)p->p_pid, args->sig, (void *)args->handler);
159#endif
160    if (args->sig <= 0 || args->sig >= LINUX_NSIG)
161	return EINVAL;
162    sg = stackgap_init();
163    nsa = stackgap_alloc(&sg, sizeof *nsa);
164    osa = stackgap_alloc(&sg, sizeof *osa);
165
166    tmpsa.sa_handler = args->handler;
167    tmpsa.sa_mask = (sigset_t) 0;
168    tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
169    if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
170	return error;
171
172    sa_args.signum = linux_to_bsd_signal[args->sig];
173    sa_args.osa = osa;
174    sa_args.nsa = nsa;
175    if ((error = sigaction(p, &sa_args)))
176	return error;
177
178    if ((error = copyin(osa, &tmpsa, sizeof *osa)))
179	return error;
180
181    p->p_retval[0] = (int)tmpsa.sa_handler;
182
183    return 0;
184}
185
186
187int
188linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
189{
190    int error, s;
191    sigset_t mask;
192    sigset_t omask;
193
194#ifdef DEBUG
195    printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
196#endif
197
198    p->p_retval[0] = 0;
199
200    if (args->omask != NULL) {
201	omask = bsd_to_linux_sigset(p->p_sigmask);
202	if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
203	    return error;
204    }
205    if (!(args->mask))
206	return 0;
207    if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
208	return error;
209
210    mask = linux_to_bsd_sigset(mask);
211    s = splhigh();
212    switch (args->how) {
213    case LINUX_SIG_BLOCK:
214	p->p_sigmask |= (mask & ~sigcantmask);
215	break;
216    case LINUX_SIG_UNBLOCK:
217	p->p_sigmask &= ~mask;
218	break;
219    case LINUX_SIG_SETMASK:
220	p->p_sigmask = (mask & ~sigcantmask);
221	break;
222    default:
223	error = EINVAL;
224	break;
225    }
226    splx(s);
227    return error;
228}
229
230int
231linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
232{
233#ifdef DEBUG
234    printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
235#endif
236    p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
237    return 0;
238}
239
240int
241linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
242{
243    int s;
244    sigset_t mask;
245
246#ifdef DEBUG
247    printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
248	(long)p->p_pid, (unsigned long)args->mask);
249#endif
250    p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
251
252    mask = linux_to_bsd_sigset(args->mask);
253    s = splhigh();
254    p->p_sigmask = mask & ~sigcantmask;
255    splx(s);
256    return 0;
257}
258
259int
260linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
261{
262    linux_sigset_t linux_sig;
263
264#ifdef DEBUG
265    printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
266#endif
267    linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
268    return copyout(&linux_sig, args->mask, sizeof(linux_sig));
269}
270
271/*
272 * Linux has two extra args, restart and oldmask.  We dont use these,
273 * but it seems that "restart" is actually a context pointer that
274 * enables the signal to happen with a different register set.
275 */
276int
277linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args)
278{
279    struct sigsuspend_args tmp;
280
281#ifdef DEBUG
282    printf("Linux-emul(%ld): sigsuspend(%08lx)\n",
283	(long)p->p_pid, (unsigned long)args->mask);
284#endif
285    tmp.mask = linux_to_bsd_sigset(args->mask);
286    return sigsuspend(p, &tmp);
287}
288
289int
290linux_pause(struct proc *p, struct linux_pause_args *args)
291{
292    struct sigsuspend_args tmp;
293
294#ifdef DEBUG
295    printf("Linux-emul(%d): pause()\n", p->p_pid);
296#endif
297    tmp.mask = p->p_sigmask;
298    return sigsuspend(p, &tmp);
299}
300
301int
302linux_kill(struct proc *p, struct linux_kill_args *args)
303{
304    struct kill_args /* {
305	int pid;
306	int signum;
307    } */ tmp;
308
309#ifdef DEBUG
310    printf("Linux-emul(%d): kill(%d, %d)\n",
311	   p->p_pid, args->pid, args->signum);
312#endif
313    if (args->signum < 0 || args->signum >= LINUX_NSIG)
314	return EINVAL;
315    tmp.pid = args->pid;
316    tmp.signum = linux_to_bsd_signal[args->signum];
317    return kill(p, &tmp);
318}
319