xref: /freebsd/sys/compat/linux/linux_signal.c (revision f35e5d0ef0a10ebda81a076bbd838d12b916dab5) 
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  * $FreeBSD$
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 
41 static sigset_t
42 linux_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 
55 static linux_sigset_t
56 bsd_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 
69 static void
70 linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
71 {
72     bsa->sa_mask = linux_to_bsd_sigset(lsa->lsa_mask);
73     bsa->sa_handler = lsa->lsa_handler;
74     bsa->sa_flags = 0;
75     if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
76 	bsa->sa_flags |= SA_NOCLDSTOP;
77     if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
78 	bsa->sa_flags |= SA_NOCLDWAIT;
79     if (lsa->lsa_flags & LINUX_SA_SIGINFO)
80 	bsa->sa_flags |= SA_SIGINFO;
81     if (lsa->lsa_flags & LINUX_SA_ONSTACK)
82 	bsa->sa_flags |= SA_ONSTACK;
83     if (lsa->lsa_flags & LINUX_SA_RESTART)
84 	bsa->sa_flags |= SA_RESTART;
85     if (lsa->lsa_flags & LINUX_SA_ONESHOT)
86 	bsa->sa_flags |= SA_RESETHAND;
87     if (lsa->lsa_flags & LINUX_SA_NOMASK)
88 	bsa->sa_flags |= SA_NODEFER;
89 }
90 
91 static void
92 bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
93 {
94     lsa->lsa_handler = bsa->sa_handler;
95     lsa->lsa_restorer = NULL;	/* unsupported */
96     lsa->lsa_mask = bsd_to_linux_sigset(bsa->sa_mask);
97     lsa->lsa_flags = 0;
98     if (bsa->sa_flags & SA_NOCLDSTOP)
99 	lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
100     if (bsa->sa_flags & SA_NOCLDWAIT)
101 	lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
102     if (bsa->sa_flags & SA_SIGINFO)
103 	lsa->lsa_flags |= LINUX_SA_SIGINFO;
104     if (bsa->sa_flags & SA_ONSTACK)
105 	lsa->lsa_flags |= LINUX_SA_ONSTACK;
106     if (bsa->sa_flags & SA_RESTART)
107 	lsa->lsa_flags |= LINUX_SA_RESTART;
108     if (bsa->sa_flags & SA_RESETHAND)
109 	lsa->lsa_flags |= LINUX_SA_ONESHOT;
110     if (bsa->sa_flags & SA_NODEFER)
111 	lsa->lsa_flags |= LINUX_SA_NOMASK;
112 }
113 
114 static int
115 linux_do_sigaction(struct proc *p, int linux_sig, linux_sigaction_t *linux_nsa,
116 		   linux_sigaction_t *linux_osa)
117 {
118     struct sigaction *nsa, *osa, sa;
119     struct sigaction_args sa_args;
120     int error;
121     caddr_t sg = stackgap_init();
122 
123     if (linux_sig <= 0 || linux_sig >= LINUX_NSIG)
124 	return EINVAL;
125 
126     if (linux_osa)
127 	osa = stackgap_alloc(&sg, sizeof(struct sigaction));
128     else
129 	osa = NULL;
130 
131     if (linux_nsa) {
132 	nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
133 	linux_to_bsd_sigaction(linux_nsa, &sa);
134 	error = copyout(&sa, nsa, sizeof(struct sigaction));
135 	if (error)
136 	    return error;
137     }
138     else
139 	nsa = NULL;
140 
141     sa_args.signum = linux_to_bsd_signal[linux_sig];
142     sa_args.nsa = nsa;
143     sa_args.osa = osa;
144     error = sigaction(p, &sa_args);
145     if (error)
146 	return error;
147 
148     if (linux_osa) {
149 	error = copyin(osa, &sa, sizeof(struct sigaction));
150 	if (error)
151 	    return error;
152 	bsd_to_linux_sigaction(&sa, linux_osa);
153     }
154 
155     return 0;
156 }
157 
158 int
159 linux_sigaction(struct proc *p, struct linux_sigaction_args *args)
160 {
161     linux_sigaction_t nsa, osa;
162     int error;
163 
164 #ifdef DEBUG
165     printf("Linux-emul(%ld): sigaction(%d, %p, %p)\n",
166 	   (long)p->p_pid, args->sig, (void *)args->nsa, (void *)args->osa);
167 #endif
168 
169     if (args->nsa) {
170 	error = copyin(args->nsa, &nsa, sizeof(linux_sigaction_t));
171 	if (error)
172 	    return error;
173     }
174 
175     error = linux_do_sigaction(p, args->sig,
176 			       args->nsa ? &nsa : NULL,
177 			       args->osa ? &osa : NULL);
178     if (error)
179 	return error;
180 
181     if (args->osa) {
182 	error = copyout(&osa, args->osa, sizeof(linux_sigaction_t));
183 	if (error)
184 	    return error;
185     }
186 
187     return 0;
188 }
189 
190 int
191 linux_signal(struct proc *p, struct linux_signal_args *args)
192 {
193     linux_sigaction_t nsa, osa;
194     int error;
195 
196 #ifdef DEBUG
197     printf("Linux-emul(%ld): signal(%d, %p)\n",
198 	   (long)p->p_pid, args->sig, (void *)args->handler);
199 #endif
200 
201     nsa.lsa_handler = args->handler;
202     nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
203     nsa.lsa_mask = NULL;
204 
205     error = linux_do_sigaction(p, args->sig, &nsa, &osa);
206 
207     p->p_retval[0] = (int)osa.lsa_handler;
208 
209     return 0;
210 }
211 
212 int
213 linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
214 {
215     linux_sigaction_t nsa, osa;
216     linux_new_sigaction_t new_sa;
217     int error;
218 
219 #ifdef DEBUG
220     printf("Linux-emul(%ld): rt_sigaction(%d, %p, %p, %d)\n",
221 	   (long)p->p_pid, args->sig, (void *)args->act,
222 	   (void *)args->oact, args->sigsetsize);
223 #endif
224 
225     if (args->sigsetsize != sizeof(linux_new_sigset_t))
226 	return EINVAL;
227 
228 #ifdef DEBUG
229     if (args->sig >= LINUX_NSIG) {
230 	printf("LINUX(%ld): rt_sigaction: 64-bit signal (%d)\n",
231 	       (long)p->p_pid, args->sig);
232     }
233 #endif
234 
235     if (args->act) {
236 	error = copyin(args->act, &new_sa, sizeof(linux_new_sigaction_t));
237 	if (error)
238 	    return error;
239 
240 	nsa.lsa_handler = new_sa.lsa_handler;
241 	nsa.lsa_mask = new_sa.lsa_mask.sig[0];
242 	nsa.lsa_flags = new_sa.lsa_flags;
243 	nsa.lsa_restorer = new_sa.lsa_restorer;
244 
245 #ifdef DEBUG
246 	if (new_sa.lsa_mask.sig[1] != 0)
247 	    printf("LINUX(%ld): rt_sigaction: sig[1] = 0x%08lx\n",
248 		   (long)p->p_pid, new_sa.lsa_mask.sig[1]);
249 #endif
250     }
251 
252     error = linux_do_sigaction(p, args->sig,
253 			       args->act ? &nsa : NULL,
254 			       args->oact ? &osa : NULL);
255     if (error)
256 	return error;
257 
258     if (args->oact) {
259 	new_sa.lsa_handler = osa.lsa_handler;
260 	new_sa.lsa_flags = osa.lsa_flags;
261 	new_sa.lsa_restorer = osa.lsa_restorer;
262 	new_sa.lsa_mask.sig[0] = osa.lsa_mask;
263 	new_sa.lsa_mask.sig[1] = 0;
264 	error = copyout(&osa, args->oact, sizeof(linux_new_sigaction_t));
265 	if (error)
266 	    return error;
267     }
268 
269     return 0;
270 }
271 
272 static int
273 linux_do_sigprocmask(struct proc *p, int how, linux_sigset_t *new,
274 		     linux_sigset_t *old)
275 {
276     int error = 0, s;
277     sigset_t mask;
278 
279     p->p_retval[0] = 0;
280 
281     if (old != NULL)
282 	*old = bsd_to_linux_sigset(p->p_sigmask);
283 
284     if (new != NULL) {
285 	mask = linux_to_bsd_sigset(*new);
286 
287 	s = splhigh();
288 
289 	switch (how) {
290 	case LINUX_SIG_BLOCK:
291 	    p->p_sigmask |= (mask & ~sigcantmask);
292 	    break;
293 	case LINUX_SIG_UNBLOCK:
294 	    p->p_sigmask &= ~mask;
295 	    break;
296 	case LINUX_SIG_SETMASK:
297 	    p->p_sigmask = (mask & ~sigcantmask);
298 	    break;
299 	default:
300 	    error = EINVAL;
301 	    break;
302 	}
303 
304 	splx(s);
305     }
306 
307     return error;
308 }
309 
310 int
311 linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
312 {
313     linux_sigset_t mask;
314     linux_sigset_t omask;
315     int error;
316 
317 #ifdef DEBUG
318     printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
319 #endif
320 
321     if (args->mask != NULL) {
322 	error = copyin(args->mask, &mask, sizeof(linux_sigset_t));
323 	if (error)
324 	    return error;
325     }
326 
327     error = linux_do_sigprocmask(p, args->how,
328 				 args->mask ? &mask : NULL,
329 				 args->omask ? &omask : NULL);
330 
331     if (!error && args->omask != NULL) {
332 	error = copyout(&omask, args->omask, sizeof(linux_sigset_t));
333     }
334 
335     return error;
336 }
337 
338 int
339 linux_rt_sigprocmask(struct proc *p, struct linux_rt_sigprocmask_args *args)
340 {
341     linux_new_sigset_t new_mask;
342     linux_sigset_t old_mask;
343     int error;
344 
345 #ifdef DEBUG
346     printf("Linux-emul(%ld): rt_sigprocmask(%d, %p, %p, %d)\n",
347 	   (long)p->p_pid, args->how, (void *)args->mask,
348 	   (void *)args->omask, args->sigsetsize);
349 #endif
350 
351     if (args->sigsetsize != sizeof(linux_new_sigset_t))
352 	return EINVAL;
353 
354     if (args->mask != NULL) {
355 	error = copyin(args->mask, &new_mask, sizeof(linux_new_sigset_t));
356 	if (error)
357 	    return error;
358 
359 #ifdef DEBUG
360 	if (new_mask.sig[1] != 0)
361 	    printf("LINUX(%ld): rt_sigprocmask: sig[1] = 0x%08lx\n",
362 		   (long)p->p_pid, new_mask.sig[1]);
363 #endif
364     }
365 
366     error = linux_do_sigprocmask(p, args->how,
367 				 args->mask ? new_mask.sig : NULL,
368 				 args->omask ? &old_mask : NULL);
369 
370     if (!error && args->omask != NULL) {
371 	new_mask.sig[0] = old_mask;
372 	error = copyout(&new_mask, args->omask, sizeof(linux_new_sigset_t));
373     }
374 
375     return error;
376 }
377 
378 int
379 linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
380 {
381 #ifdef DEBUG
382     printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
383 #endif
384     p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
385     return 0;
386 }
387 
388 int
389 linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
390 {
391     int s;
392     sigset_t mask;
393 
394 #ifdef DEBUG
395     printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
396 	(long)p->p_pid, (unsigned long)args->mask);
397 #endif
398     p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
399 
400     mask = linux_to_bsd_sigset(args->mask);
401     s = splhigh();
402     p->p_sigmask = mask & ~sigcantmask;
403     splx(s);
404     return 0;
405 }
406 
407 int
408 linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
409 {
410     linux_sigset_t linux_sig;
411 
412 #ifdef DEBUG
413     printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
414 #endif
415     linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
416     return copyout(&linux_sig, args->mask, sizeof(linux_sig));
417 }
418 
419 /*
420  * Linux has two extra args, restart and oldmask.  We dont use these,
421  * but it seems that "restart" is actually a context pointer that
422  * enables the signal to happen with a different register set.
423  */
424 int
425 linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args)
426 {
427     struct sigsuspend_args tmp;
428 
429 #ifdef DEBUG
430     printf("Linux-emul(%ld): sigsuspend(%08lx)\n",
431 	(long)p->p_pid, (unsigned long)args->mask);
432 #endif
433     tmp.mask = linux_to_bsd_sigset(args->mask);
434     return sigsuspend(p, &tmp);
435 }
436 
437 int
438 linux_pause(struct proc *p, struct linux_pause_args *args)
439 {
440     struct sigsuspend_args tmp;
441 
442 #ifdef DEBUG
443     printf("Linux-emul(%d): pause()\n", p->p_pid);
444 #endif
445     tmp.mask = p->p_sigmask;
446     return sigsuspend(p, &tmp);
447 }
448 
449 int
450 linux_kill(struct proc *p, struct linux_kill_args *args)
451 {
452     struct kill_args /* {
453 	int pid;
454 	int signum;
455     } */ tmp;
456 
457 #ifdef DEBUG
458     printf("Linux-emul(%d): kill(%d, %d)\n",
459 	   p->p_pid, args->pid, args->signum);
460 #endif
461     if (args->signum < 0 || args->signum >= LINUX_NSIG)
462 	return EINVAL;
463     tmp.pid = args->pid;
464     tmp.signum = linux_to_bsd_signal[args->signum];
465     return kill(p, &tmp);
466 }
467