linux_signal.c revision 14381 
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 1.5 1996/03/02 21:00:11 peter 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/exec.h>
36#include <sys/signal.h>
37#include <sys/signalvar.h>
38
39#include <i386/linux/linux.h>
40#include <i386/linux/linux_proto.h>
41#include <i386/linux/linux_util.h>
42
43static sigset_t
44linux_to_bsd_sigset(linux_sigset_t mask) {
45    int b, l;
46    sigset_t new = 0;
47
48    for (l = 1; l <= LINUX_NSIG; l++) {
49	if (mask & (1 << (l - 1))) {
50	    if ((b = linux_to_bsd_signal[l]))
51		new |= (1 << (b - 1));
52	}
53    }
54    return new;
55}
56
57static linux_sigset_t
58bsd_to_linux_sigset(sigset_t mask) {
59    int b, l;
60    sigset_t new = 0;
61
62    for (b = 1; b <= NSIG; b++) {
63	if (mask & (1 << (b - 1))) {
64	    if ((l = bsd_to_linux_signal[b]))
65		new |= (1 << (l - 1));
66	}
67    }
68    return new;
69}
70
71static void
72linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
73{
74    bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
75    bsa->sa_handler = lsa->sa_handler;
76    bsa->sa_flags = 0;
77    if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
78	bsa->sa_flags |= SA_NOCLDSTOP;
79    if (lsa->sa_flags & LINUX_SA_ONSTACK)
80	bsa->sa_flags |= SA_ONSTACK;
81    if (lsa->sa_flags & LINUX_SA_RESTART)
82	bsa->sa_flags |= SA_RESTART;
83    if (lsa->sa_flags & LINUX_SA_ONESHOT)
84	bsa->sa_flags |= SA_RESETHAND;
85    if (lsa->sa_flags & LINUX_SA_NOMASK)
86	bsa->sa_flags |= SA_NODEFER;
87}
88
89static void
90bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
91{
92    lsa->sa_handler = bsa->sa_handler;
93    lsa->sa_restorer = NULL;	/* unsupported */
94    lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
95    lsa->sa_flags = 0;
96    if (bsa->sa_flags & SA_NOCLDSTOP)
97	lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
98    if (bsa->sa_flags & SA_ONSTACK)
99	lsa->sa_flags |= LINUX_SA_ONSTACK;
100    if (bsa->sa_flags & SA_RESTART)
101	lsa->sa_flags |= LINUX_SA_RESTART;
102    if (bsa->sa_flags & SA_RESETHAND)
103	lsa->sa_flags |= LINUX_SA_ONESHOT;
104    if (bsa->sa_flags & SA_NODEFER)
105	lsa->sa_flags |= LINUX_SA_NOMASK;
106}
107
108int
109linux_sigaction(struct proc *p, struct linux_sigaction_args *args, int *retval)
110{
111    linux_sigaction_t linux_sa;
112    struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
113    struct sigaction_args sa;
114    int error;
115    caddr_t sg = stackgap_init();
116
117#ifdef DEBUG
118    printf("Linux-emul(%d): sigaction(%d, %08x, %08x)\n", p->p_pid, args->sig,
119	args->nsa, args->osa);
120#endif
121
122    if (args->osa)
123	osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
124
125    if (args->nsa) {
126	nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
127	if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
128	    return error;
129	linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
130	if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
131	    return error;
132    }
133    sa.signum = linux_to_bsd_signal[args->sig];
134    sa.nsa = nsa;
135    sa.osa = osa;
136    if ((error = sigaction(p, &sa, retval)))
137	return error;
138
139    if (args->osa) {
140	if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
141	    return error;
142	bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
143	if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
144	    return error;
145    }
146    return 0;
147}
148
149int
150linux_signal(struct proc *p, struct linux_signal_args *args, int *retval)
151{
152    caddr_t sg;
153    struct sigaction_args sa_args;
154    struct sigaction *osa, *nsa, tmpsa;
155    int error;
156
157#ifdef DEBUG
158    printf("Linux-emul(%d): signal(%d, %08x)\n", p->p_pid,
159	    args->sig, args->handler);
160#endif
161    sg = stackgap_init();
162    nsa = stackgap_alloc(&sg, sizeof *nsa);
163    osa = stackgap_alloc(&sg, sizeof *osa);
164
165    tmpsa.sa_handler = args->handler;
166    tmpsa.sa_mask = (sigset_t) 0;
167    tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
168    if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
169	return error;
170
171    sa_args.signum = linux_to_bsd_signal[args->sig];
172    sa_args.osa = osa;
173    sa_args.nsa = nsa;
174    if ((error = sigaction(p, &sa_args, retval)))
175	return error;
176
177    if ((error = copyin(osa, &tmpsa, sizeof *osa)))
178	return error;
179
180    *retval = (int)tmpsa.sa_handler;
181
182    return 0;
183}
184
185
186int
187linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
188		  int *retval)
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    *retval = 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, int *retval)
232{
233#ifdef DEBUG
234    printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
235#endif
236    *retval = bsd_to_linux_sigset(p->p_sigmask);
237    return 0;
238}
239
240int
241linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args,int *retval)
242{
243    int s;
244    sigset_t mask;
245
246#ifdef DEBUG
247    printf("Linux-emul(%d): sigsetmask(%08x)\n", p->p_pid, args->mask);
248#endif
249    *retval = bsd_to_linux_sigset(p->p_sigmask);
250
251    mask = linux_to_bsd_sigset(args->mask);
252    s = splhigh();
253    p->p_sigmask = mask & ~sigcantmask;
254    splx(s);
255    return 0;
256}
257
258int
259linux_sigpending(struct proc *p, struct linux_sigpending_args *args,int *retval)
260{
261    linux_sigset_t linux_sig;
262
263#ifdef DEBUG
264    printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
265#endif
266    linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
267    return copyout(&linux_sig, args->mask, sizeof(linux_sig));
268}
269
270/*
271 * Linux has two extra args, restart and oldmask.  We dont use these,
272 * but it seems that "restart" is actually a context pointer that
273 * enables the signal to happen with a different register set.
274 */
275int
276linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args,int *retval)
277{
278    struct sigsuspend_args tmp;
279
280#ifdef DEBUG
281    printf("Linux-emul(%d): sigsuspend(%08x)\n", p->p_pid, args->mask);
282#endif
283    tmp.mask = linux_to_bsd_sigset(args->mask);
284    return sigsuspend(p, &tmp , retval);
285}
286
287int
288linux_pause(struct proc *p, struct linux_pause_args *args,int *retval)
289{
290    struct sigsuspend_args tmp;
291
292#ifdef DEBUG
293    printf("Linux-emul(%d): pause()\n", p->p_pid);
294#endif
295    tmp.mask = p->p_sigmask;
296    return sigsuspend(p, &tmp , retval);
297}
298
299int
300linux_kill(struct proc *p, struct linux_kill_args *args, int *retval)
301{
302    struct kill_args /* {
303	int pid;
304	int signum;
305    } */ tmp;
306
307#ifdef DEBUG
308    printf("Linux-emul(%d): kill(%d, %d)\n",
309	   p->p_pid, args->pid, args->signum);
310#endif
311    tmp.pid = args->pid;
312    tmp.signum = linux_to_bsd_signal[args->signum];
313    return kill(p, &tmp, retval);
314}
315