xref: /netbsd-src/sys/compat/netbsd32/netbsd32_signal.c (revision b1c86f5f087524e68db12794ee9c3e3da1ab17a0) 
1 /*	$NetBSD: netbsd32_signal.c,v 1.34 2010/04/23 15:19:20 rmind Exp $	*/
2 
3 /*
4  * Copyright (c) 1998, 2001 Matthew R. Green
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: netbsd32_signal.c,v 1.34 2010/04/23 15:19:20 rmind Exp $");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mount.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37 #include <sys/signalvar.h>
38 #include <sys/proc.h>
39 #include <sys/sa.h>
40 #include <sys/savar.h>
41 #include <sys/wait.h>
42 #include <sys/dirent.h>
43 
44 #include <uvm/uvm_extern.h>
45 
46 #include <compat/netbsd32/netbsd32.h>
47 #include <compat/netbsd32/netbsd32_conv.h>
48 #include <compat/netbsd32/netbsd32_syscallargs.h>
49 #include <compat/netbsd32/netbsd32_sa.h>
50 
51 #include <compat/sys/signal.h>
52 #include <compat/sys/signalvar.h>
53 #include <compat/sys/siginfo.h>
54 #include <compat/sys/ucontext.h>
55 #include <compat/common/compat_sigaltstack.h>
56 
57 #ifdef unused
58 static void netbsd32_si32_to_si(siginfo_t *, const siginfo32_t *);
59 #endif
60 
61 
62 int
63 netbsd32_sigaction(struct lwp *l, const struct netbsd32_sigaction_args *uap, register_t *retval)
64 {
65 	/* {
66 		syscallarg(int) signum;
67 		syscallarg(const netbsd32_sigactionp_t) nsa;
68 		syscallarg(netbsd32_sigactionp_t) osa;
69 	} */
70 	struct sigaction nsa, osa;
71 	struct netbsd32_sigaction *sa32p, sa32;
72 	int error;
73 
74 	if (SCARG_P32(uap, nsa)) {
75 		sa32p = SCARG_P32(uap, nsa);
76 		if (copyin(sa32p, &sa32, sizeof(sa32)))
77 			return EFAULT;
78 		nsa.sa_handler = (void *)NETBSD32PTR64(sa32.netbsd32_sa_handler);
79 		nsa.sa_mask = sa32.netbsd32_sa_mask;
80 		nsa.sa_flags = sa32.netbsd32_sa_flags;
81 	}
82 	error = sigaction1(l, SCARG(uap, signum),
83 			   SCARG_P32(uap, nsa) ? &nsa : 0,
84 			   SCARG_P32(uap, osa) ? &osa : 0,
85 			   NULL, 0);
86 
87 	if (error)
88 		return (error);
89 
90 	if (SCARG_P32(uap, osa)) {
91 		NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
92 		sa32.netbsd32_sa_mask = osa.sa_mask;
93 		sa32.netbsd32_sa_flags = osa.sa_flags;
94 		sa32p = SCARG_P32(uap, osa);
95 		if (copyout(&sa32, sa32p, sizeof(sa32)))
96 			return EFAULT;
97 	}
98 
99 	return (0);
100 }
101 
102 int
103 netbsd32___sigaltstack14(struct lwp *l, const struct netbsd32___sigaltstack14_args *uap, register_t *retval)
104 {
105 	/* {
106 		syscallarg(const netbsd32_sigaltstackp_t) nss;
107 		syscallarg(netbsd32_sigaltstackp_t) oss;
108 	} */
109 	compat_sigaltstack(uap, netbsd32_sigaltstack, SS_ONSTACK, SS_DISABLE);
110 }
111 
112 /* ARGSUSED */
113 int
114 netbsd32___sigaction14(struct lwp *l, const struct netbsd32___sigaction14_args *uap, register_t *retval)
115 {
116 	/* {
117 		syscallarg(int) signum;
118 		syscallarg(const struct sigaction *) nsa;
119 		syscallarg(struct sigaction *) osa;
120 	} */
121 	struct netbsd32_sigaction sa32;
122 	struct sigaction nsa, osa;
123 	int error;
124 
125 	if (SCARG_P32(uap, nsa)) {
126 		error = copyin(SCARG_P32(uap, nsa), &sa32, sizeof(sa32));
127 		if (error)
128 			return (error);
129 		nsa.sa_handler = NETBSD32PTR64(sa32.netbsd32_sa_handler);
130 		nsa.sa_mask = sa32.netbsd32_sa_mask;
131 		nsa.sa_flags = sa32.netbsd32_sa_flags;
132 	}
133 	error = sigaction1(l, SCARG(uap, signum),
134 		    SCARG_P32(uap, nsa) ? &nsa : 0,
135 		    SCARG_P32(uap, osa) ? &osa : 0,
136 		    NULL, 0);
137 	if (error)
138 		return (error);
139 	if (SCARG_P32(uap, osa)) {
140 		NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
141 		sa32.netbsd32_sa_mask = osa.sa_mask;
142 		sa32.netbsd32_sa_flags = osa.sa_flags;
143 		error = copyout(&sa32, SCARG_P32(uap, osa), sizeof(sa32));
144 		if (error)
145 			return (error);
146 	}
147 	return (0);
148 }
149 
150 /* ARGSUSED */
151 int
152 netbsd32___sigaction_sigtramp(struct lwp *l, const struct netbsd32___sigaction_sigtramp_args *uap, register_t *retval)
153 {
154 	/* {
155 		syscallarg(int) signum;
156 		syscallarg(const netbsd32_sigactionp_t) nsa;
157 		syscallarg(netbsd32_sigactionp_t) osa;
158 		syscallarg(netbsd32_voidp) tramp;
159 		syscallarg(int) vers;
160 	} */
161 	struct netbsd32_sigaction sa32;
162 	struct sigaction nsa, osa;
163 	int error;
164 
165 	if (SCARG_P32(uap, nsa)) {
166 		error = copyin(SCARG_P32(uap, nsa), &sa32, sizeof(sa32));
167 		if (error)
168 			return (error);
169 		nsa.sa_handler = NETBSD32PTR64(sa32.netbsd32_sa_handler);
170 		nsa.sa_mask = sa32.netbsd32_sa_mask;
171 		nsa.sa_flags = sa32.netbsd32_sa_flags;
172 	}
173 	error = sigaction1(l, SCARG(uap, signum),
174 	    SCARG_P32(uap, nsa) ? &nsa : 0,
175 	    SCARG_P32(uap, osa) ? &osa : 0,
176 	    SCARG_P32(uap, tramp), SCARG(uap, vers));
177 	if (error)
178 		return (error);
179 	if (SCARG_P32(uap, osa)) {
180 		NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
181 		sa32.netbsd32_sa_mask = osa.sa_mask;
182 		sa32.netbsd32_sa_flags = osa.sa_flags;
183 		error = copyout(&sa32, SCARG_P32(uap, osa), sizeof(sa32));
184 		if (error)
185 			return (error);
186 	}
187 	return (0);
188 }
189 
190 #ifdef unused
191 static void
192 netbsd32_si32_to_si(siginfo_t *si, const siginfo32_t *si32)
193 {
194 	memset(si, 0, sizeof (*si));
195 	si->si_signo = si32->si_signo;
196 	si->si_code = si32->si_code;
197 	si->si_errno = si32->si_errno;
198 
199 	switch (si32->si_signo) {
200 	case SIGILL:
201 	case SIGBUS:
202 	case SIGSEGV:
203 	case SIGFPE:
204 	case SIGTRAP:
205 		si->si_addr = NETBSD32PTR64(si32->si_addr);
206 		si->si_trap = si32->si_trap;
207 		break;
208 	case SIGALRM:
209 	case SIGVTALRM:
210 	case SIGPROF:
211 		si->si_pid = si32->si_pid;
212 		si->si_uid = si32->si_uid;
213 		/*
214 		 * XXX sival_ptr is currently unused.
215 		 */
216 		si->si_value.sival_int = si32->si_value.sival_int;
217 		break;
218 	case SIGCHLD:
219 		si->si_pid = si32->si_pid;
220 		si->si_uid = si32->si_uid;
221 		si->si_utime = si32->si_utime;
222 		si->si_stime = si32->si_stime;
223 		break;
224 	case SIGURG:
225 	case SIGIO:
226 		si->si_band = si32->si_band;
227 		si->si_fd = si32->si_fd;
228 		break;
229 	}
230 }
231 #endif
232 
233 void
234 netbsd32_si_to_si32(siginfo32_t *si32, const siginfo_t *si)
235 {
236 	memset(si32, 0, sizeof (*si32));
237 	si32->si_signo = si->si_signo;
238 	si32->si_code = si->si_code;
239 	si32->si_errno = si->si_errno;
240 
241 	switch (si32->si_signo) {
242 	case 0:	/* SA */
243 		si32->si_value.sival_int = si->si_value.sival_int;
244 		break;
245 	case SIGILL:
246 	case SIGBUS:
247 	case SIGSEGV:
248 	case SIGFPE:
249 	case SIGTRAP:
250 		si32->si_addr = (uint32_t)(uintptr_t)si->si_addr;
251 		si32->si_trap = si->si_trap;
252 		break;
253 	case SIGALRM:
254 	case SIGVTALRM:
255 	case SIGPROF:
256 		si32->si_pid = si->si_pid;
257 		si32->si_uid = si->si_uid;
258 		/*
259 		 * XXX sival_ptr is currently unused.
260 		 */
261 		si32->si_value.sival_int = si->si_value.sival_int;
262 		break;
263 	case SIGCHLD:
264 		si32->si_pid = si->si_pid;
265 		si32->si_uid = si->si_uid;
266 		si32->si_status = si->si_status;
267 		si32->si_utime = si->si_utime;
268 		si32->si_stime = si->si_stime;
269 		break;
270 	case SIGURG:
271 	case SIGIO:
272 		si32->si_band = si->si_band;
273 		si32->si_fd = si->si_fd;
274 		break;
275 	}
276 }
277 
278 void
279 getucontext32(struct lwp *l, ucontext32_t *ucp)
280 {
281 	struct proc *p = l->l_proc;
282 
283 	KASSERT(mutex_owned(p->p_lock));
284 
285 	ucp->uc_flags = 0;
286 	ucp->uc_link = (uint32_t)(intptr_t)l->l_ctxlink;
287 
288 	if (p->p_sa != NULL)
289 		ucp->uc_sigmask = p->p_sa->sa_sigmask;
290 	else
291 		ucp->uc_sigmask = l->l_sigmask;
292 	ucp->uc_flags |= _UC_SIGMASK;
293 
294 	/*
295 	 * The (unsupplied) definition of the `current execution stack'
296 	 * in the System V Interface Definition appears to allow returning
297 	 * the main context stack.
298 	 */
299 	if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) {
300 		ucp->uc_stack.ss_sp = USRSTACK32;
301 		ucp->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
302 		ucp->uc_stack.ss_flags = 0;	/* XXX, def. is Very Fishy */
303 	} else {
304 		/* Simply copy alternate signal execution stack. */
305 		ucp->uc_stack.ss_sp =
306 		    (uint32_t)(intptr_t)l->l_sigstk.ss_sp;
307 		ucp->uc_stack.ss_size = l->l_sigstk.ss_size;
308 		ucp->uc_stack.ss_flags = l->l_sigstk.ss_flags;
309 	}
310 	ucp->uc_flags |= _UC_STACK;
311 	mutex_exit(p->p_lock);
312 	cpu_getmcontext32(l, &ucp->uc_mcontext, &ucp->uc_flags);
313 	mutex_enter(p->p_lock);
314 }
315 
316 /*
317  * getucontext32_sa:
318  *	Get a ucontext32_t for use in SA upcall generation.
319  * Tweaked version of getucontext32. We 1) do not take p_lock, 2)
320  * fudge things with uc_link (which is usually NULL for libpthread
321  * code), and 3) we report an empty signal mask.
322  */
323 void
324 getucontext32_sa(struct lwp *l, ucontext32_t *ucp)
325 {
326 	struct proc *p = l->l_proc;
327 
328 	ucp->uc_flags = 0;
329 	ucp->uc_link = (uint32_t)(intptr_t)l->l_ctxlink;
330 
331 	sigemptyset(&ucp->uc_sigmask);
332 	ucp->uc_flags |= _UC_SIGMASK;
333 
334 	/*
335 	 * The (unsupplied) definition of the `current execution stack'
336 	 * in the System V Interface Definition appears to allow returning
337 	 * the main context stack.
338 	 */
339 	if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) {
340 		ucp->uc_stack.ss_sp = USRSTACK32;
341 		ucp->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
342 		ucp->uc_stack.ss_flags = 0;	/* XXX, def. is Very Fishy */
343 	} else {
344 		/* Simply copy alternate signal execution stack. */
345 		ucp->uc_stack.ss_sp =
346 		    (uint32_t)(intptr_t)l->l_sigstk.ss_sp;
347 		ucp->uc_stack.ss_size = l->l_sigstk.ss_size;
348 		ucp->uc_stack.ss_flags = l->l_sigstk.ss_flags;
349 	}
350 	ucp->uc_flags |= _UC_STACK;
351 	cpu_getmcontext32(l, &ucp->uc_mcontext, &ucp->uc_flags);
352 }
353 
354 /* ARGSUSED */
355 int
356 netbsd32_getcontext(struct lwp *l, const struct netbsd32_getcontext_args *uap, register_t *retval)
357 {
358 	/* {
359 		syscallarg(netbsd32_ucontextp) ucp;
360 	} */
361 	struct proc *p = l->l_proc;
362 	ucontext32_t uc;
363 
364 	mutex_enter(p->p_lock);
365 	getucontext32(l, &uc);
366 	mutex_exit(p->p_lock);
367 
368 	return copyout(&uc, SCARG_P32(uap, ucp), sizeof (ucontext32_t));
369 }
370 
371 int
372 setucontext32(struct lwp *l, const ucontext32_t *ucp)
373 {
374 	struct proc *p = l->l_proc;
375 	int error;
376 
377 	KASSERT(mutex_owned(p->p_lock));
378 
379 	if ((ucp->uc_flags & _UC_SIGMASK) != 0) {
380 		error = sigprocmask1(l, SIG_SETMASK, &ucp->uc_sigmask, NULL);
381 		if (error != 0)
382 			return error;
383 	}
384 
385 	mutex_exit(p->p_lock);
386 	error = cpu_setmcontext32(l, &ucp->uc_mcontext, ucp->uc_flags);
387 	mutex_enter(p->p_lock);
388 	if (error != 0)
389 		return (error);
390 
391 	l->l_ctxlink = (void *)(intptr_t)ucp->uc_link;
392 
393 	/*
394 	 * If there was stack information, update whether or not we are
395 	 * still running on an alternate signal stack.
396 	 */
397 	if ((ucp->uc_flags & _UC_STACK) != 0) {
398 		if (ucp->uc_stack.ss_flags & SS_ONSTACK)
399 			l->l_sigstk.ss_flags |= SS_ONSTACK;
400 		else
401 			l->l_sigstk.ss_flags &= ~SS_ONSTACK;
402 	}
403 
404 	return 0;
405 }
406 
407 /* ARGSUSED */
408 int
409 netbsd32_setcontext(struct lwp *l, const struct netbsd32_setcontext_args *uap, register_t *retval)
410 {
411 	/* {
412 		syscallarg(netbsd32_ucontextp) ucp;
413 	} */
414 	ucontext32_t uc;
415 	int error;
416 	struct proc *p = l->l_proc;
417 
418 	error = copyin(SCARG_P32(uap, ucp), &uc, sizeof (uc));
419 	if (error)
420 		return (error);
421 	if (!(uc.uc_flags & _UC_CPU))
422 		return (EINVAL);
423 	mutex_enter(p->p_lock);
424 	error = setucontext32(l, &uc);
425 	mutex_exit(p->p_lock);
426 	if (error)
427 		return (error);
428 
429 	return (EJUSTRETURN);
430 }
431 
432 static int
433 netbsd32_sigtimedwait_put_info(const void *src, void *dst, size_t size)
434 {
435 	const siginfo_t *info = src;
436 	siginfo32_t info32;
437 
438 	netbsd32_si_to_si32(&info32, info);
439 
440 	return copyout(&info32, dst, sizeof(info32));
441 }
442 
443 static int
444 netbsd32_sigtimedwait_fetch_timeout(const void *src, void *dst, size_t size)
445 {
446 	struct timespec *ts = dst;
447 	struct netbsd32_timespec ts32;
448 	int error;
449 
450 	error = copyin(src, &ts32, sizeof(ts32));
451 	if (error)
452 		return error;
453 
454 	netbsd32_to_timespec(&ts32, ts);
455 	return 0;
456 }
457 
458 static int
459 netbsd32_sigtimedwait_put_timeout(const void *src, void *dst, size_t size)
460 {
461 	const struct timespec *ts = src;
462 	struct netbsd32_timespec ts32;
463 
464 	netbsd32_from_timespec(ts, &ts32);
465 
466 	return copyout(&ts32, dst, sizeof(ts32));
467 }
468 
469 int
470 netbsd32_____sigtimedwait50(struct lwp *l, const struct netbsd32_____sigtimedwait50_args *uap, register_t *retval)
471 {
472 	/* {
473 		syscallarg(netbsd32_sigsetp_t) set;
474 		syscallarg(netbsd32_siginfop_t) info;
475 		syscallarg(netbsd32_timespec50p_t) timeout;
476 	} */
477 	struct sys_____sigtimedwait50_args ua;
478 
479 	NETBSD32TOP_UAP(set, const sigset_t);
480 	NETBSD32TOP_UAP(info, siginfo_t);
481 	NETBSD32TOP_UAP(timeout, struct timespec);
482 
483 	return sigtimedwait1(l, &ua, retval,
484 	    netbsd32_sigtimedwait_put_info,
485 	    netbsd32_sigtimedwait_fetch_timeout,
486 	    netbsd32_sigtimedwait_put_timeout);
487 }
488