1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Linux for s390 port by D.J. Barrow
8 * <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
9 * Copyright (c) 2001-2018 The strace developers.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include "defs.h"
36 #include "nsig.h"
37 #include "xstring.h"
38
39 /* The libc headers do not define this constant since it should only be
40 used by the implementation. So we define it here. */
41 #ifndef SA_RESTORER
42 # ifdef ASM_SA_RESTORER
43 # define SA_RESTORER ASM_SA_RESTORER
44 # endif
45 #endif
46
47 /*
48 * Some architectures define SA_RESTORER in their headers,
49 * but do not actually have sa_restorer.
50 *
51 * Some architectures, otherwise, do not define SA_RESTORER in their headers,
52 * but actually have sa_restorer.
53 */
54 #ifdef HAVE_ARCH_SA_RESTORER
55 # define HAVE_SA_RESTORER HAVE_ARCH_SA_RESTORER
56 #else /* !HAVE_ARCH_SA_RESTORER */
57 # ifdef SA_RESTORER
58 # define HAVE_SA_RESTORER 1
59 # else
60 # define HAVE_SA_RESTORER 0
61 # endif
62 #endif /* HAVE_ARCH_SA_RESTORER */
63
64 #include "xlat/sa_handler_values.h"
65 #include "xlat/sigact_flags.h"
66 #include "xlat/sigprocmaskcmds.h"
67
68 /* Anonymous realtime signals. */
69 #ifndef ASM_SIGRTMIN
70 /* Linux kernel >= 3.18 defines SIGRTMIN to 32 on all architectures. */
71 # define ASM_SIGRTMIN 32
72 #endif
73 #ifndef ASM_SIGRTMAX
74 /* Under glibc 2.1, SIGRTMAX et al are functions, but __SIGRTMAX is a
75 constant. This is what we want. Otherwise, just use SIGRTMAX. */
76 # ifdef SIGRTMAX
77 # ifndef __SIGRTMAX
78 # define __SIGRTMAX SIGRTMAX
79 # endif
80 # endif
81 # ifdef __SIGRTMAX
82 # define ASM_SIGRTMAX __SIGRTMAX
83 # endif
84 #endif
85
86 /* Note on the size of sigset_t:
87 *
88 * In glibc, sigset_t is an array with space for 1024 bits (!),
89 * even though all arches supported by Linux have only 64 signals
90 * except MIPS, which has 128. IOW, it is 128 bytes long.
91 *
92 * In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long).
93 * However, some old syscall return only 32 lower bits (one word).
94 * Example: sys_sigpending vs sys_rt_sigpending.
95 *
96 * Be aware of this fact when you try to
97 * memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t))
98 * - sizeof(sigset_t) is much bigger than you think,
99 * it may overflow tcp->u_arg[] array, and it may try to copy more data
100 * than is really available in <something>.
101 * Similarly,
102 * umoven(tcp, addr, sizeof(sigset_t), &sigset)
103 * may be a bad idea: it'll try to read much more data than needed
104 * to fetch a sigset_t.
105 * Use NSIG_BYTES as a size instead.
106 */
107
108 static const char *
get_sa_handler_str(kernel_ulong_t handler)109 get_sa_handler_str(kernel_ulong_t handler)
110 {
111 return xlookup(sa_handler_values, handler);
112 }
113
114 static void
print_sa_handler(kernel_ulong_t handler)115 print_sa_handler(kernel_ulong_t handler)
116 {
117 const char *sa_handler_str = get_sa_handler_str(handler);
118
119 if (sa_handler_str)
120 print_xlat_ex(handler, sa_handler_str, XLAT_STYLE_DEFAULT);
121 else
122 printaddr(handler);
123 }
124
125 const char *
signame(const int sig)126 signame(const int sig)
127 {
128 static char buf[sizeof("SIGRT_%u") + sizeof(int)*3];
129
130 if (sig >= 0) {
131 const unsigned int s = sig;
132
133 if (s < nsignals)
134 return signalent[s];
135 #ifdef ASM_SIGRTMAX
136 if (s >= ASM_SIGRTMIN && s <= (unsigned int) ASM_SIGRTMAX) {
137 xsprintf(buf, "SIGRT_%u", s - ASM_SIGRTMIN);
138 return buf;
139 }
140 #endif
141 }
142 xsprintf(buf, "%d", sig);
143 return buf;
144 }
145
146 static unsigned int
popcount32(const uint32_t * a,unsigned int size)147 popcount32(const uint32_t *a, unsigned int size)
148 {
149 unsigned int count = 0;
150
151 for (; size; ++a, --size) {
152 uint32_t x = *a;
153
154 #ifdef HAVE___BUILTIN_POPCOUNT
155 count += __builtin_popcount(x);
156 #else
157 for (; x; ++count)
158 x &= x - 1;
159 #endif
160 }
161
162 return count;
163 }
164
165 const char *
sprintsigmask_n(const char * prefix,const void * sig_mask,unsigned int bytes)166 sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes)
167 {
168 /*
169 * The maximum number of signal names to be printed
170 * is NSIG_BYTES * 8 * 2 / 3.
171 * Most of signal names have length 7,
172 * average length of signal names is less than 7.
173 * The length of prefix string does not exceed 16.
174 */
175 static char outstr[128 + 8 * (NSIG_BYTES * 8 * 2 / 3)];
176
177 char *s;
178 const uint32_t *mask;
179 uint32_t inverted_mask[NSIG_BYTES / 4];
180 unsigned int size;
181 int i;
182 char sep;
183
184 s = stpcpy(outstr, prefix);
185
186 mask = sig_mask;
187 /* length of signal mask in 4-byte words */
188 size = (bytes >= NSIG_BYTES) ? NSIG_BYTES / 4 : (bytes + 3) / 4;
189
190 /* check whether 2/3 or more bits are set */
191 if (popcount32(mask, size) >= size * (4 * 8) * 2 / 3) {
192 /* show those signals that are NOT in the mask */
193 unsigned int j;
194 for (j = 0; j < size; ++j)
195 inverted_mask[j] = ~mask[j];
196 mask = inverted_mask;
197 *s++ = '~';
198 }
199
200 sep = '[';
201 for (i = 0; (i = next_set_bit(mask, i, size * (4 * 8))) >= 0; ) {
202 ++i;
203 *s++ = sep;
204 if ((unsigned) i < nsignals) {
205 s = stpcpy(s, signalent[i] + 3);
206 }
207 #ifdef ASM_SIGRTMAX
208 else if (i >= ASM_SIGRTMIN && i <= ASM_SIGRTMAX) {
209 s = xappendstr(outstr, s, "RT_%u", i - ASM_SIGRTMIN);
210 }
211 #endif
212 else {
213 s = xappendstr(outstr, s, "%u", i);
214 }
215 sep = ' ';
216 }
217 if (sep == '[')
218 *s++ = sep;
219 *s++ = ']';
220 *s = '\0';
221 return outstr;
222 }
223
224 #define sprintsigmask_val(prefix, mask) \
225 sprintsigmask_n((prefix), &(mask), sizeof(mask))
226
227 #define tprintsigmask_val(prefix, mask) \
228 tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask)))
229
230 static const char *
sprint_old_sigmask_val(const char * const prefix,const unsigned long mask)231 sprint_old_sigmask_val(const char *const prefix, const unsigned long mask)
232 {
233 #if defined(current_wordsize) || !defined(WORDS_BIGENDIAN)
234 return sprintsigmask_n(prefix, &mask, current_wordsize);
235 #else /* !current_wordsize && WORDS_BIGENDIAN */
236 if (current_wordsize == sizeof(mask)) {
237 return sprintsigmask_val(prefix, mask);
238 } else {
239 uint32_t mask32 = mask;
240 return sprintsigmask_val(prefix, mask32);
241 }
242 #endif
243 }
244
245 #define tprint_old_sigmask_val(prefix, mask) \
246 tprints(sprint_old_sigmask_val((prefix), (mask)))
247
248 void
printsignal(int nr)249 printsignal(int nr)
250 {
251 tprints(signame(nr));
252 }
253
254 static void
print_sigset_addr_len_limit(struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len,const unsigned int min_len)255 print_sigset_addr_len_limit(struct tcb *const tcp, const kernel_ulong_t addr,
256 const kernel_ulong_t len, const unsigned int min_len)
257 {
258 /*
259 * Here len is usually equal to NSIG_BYTES or current_wordsize.
260 * But we code this defensively:
261 */
262 if (len < min_len || len > NSIG_BYTES) {
263 printaddr(addr);
264 return;
265 }
266 int mask[NSIG_BYTES / sizeof(int)] = {};
267 if (umoven_or_printaddr(tcp, addr, len, mask))
268 return;
269 tprints(sprintsigmask_n("", mask, len));
270 }
271
272 void
print_sigset_addr_len(struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len)273 print_sigset_addr_len(struct tcb *const tcp, const kernel_ulong_t addr,
274 const kernel_ulong_t len)
275 {
276 print_sigset_addr_len_limit(tcp, addr, len, current_wordsize);
277 }
278
279 void
print_sigset_addr(struct tcb * const tcp,const kernel_ulong_t addr)280 print_sigset_addr(struct tcb *const tcp, const kernel_ulong_t addr)
281 {
282 print_sigset_addr_len_limit(tcp, addr, NSIG_BYTES, NSIG_BYTES);
283 }
284
SYS_FUNC(ssetmask)285 SYS_FUNC(ssetmask)
286 {
287 if (entering(tcp)) {
288 tprint_old_sigmask_val("", (unsigned) tcp->u_arg[0]);
289 } else if (!syserror(tcp)) {
290 tcp->auxstr = sprint_old_sigmask_val("old mask ",
291 (unsigned) tcp->u_rval);
292 return RVAL_HEX | RVAL_STR;
293 }
294 return 0;
295 }
296
297 struct old_sigaction {
298 /* sa_handler may be a libc #define, need to use other name: */
299 #if defined MIPS
300 unsigned int sa_flags;
301 unsigned long sa_handler__;
302 unsigned long sa_mask;
303 #elif defined ALPHA
304 unsigned long sa_handler__;
305 unsigned long sa_mask;
306 unsigned int sa_flags;
307 #else
308 unsigned long sa_handler__;
309 unsigned long sa_mask;
310 unsigned long sa_flags;
311 unsigned long sa_restorer;
312 #endif
313 }
314 #ifdef ALPHA
315 ATTRIBUTE_PACKED
316 #endif
317 ;
318
319 static void
decode_old_sigaction(struct tcb * const tcp,const kernel_ulong_t addr)320 decode_old_sigaction(struct tcb *const tcp, const kernel_ulong_t addr)
321 {
322 struct old_sigaction sa;
323
324 #ifndef current_wordsize
325 if (current_wordsize < sizeof(sa.sa_handler__)) {
326 struct old_sigaction32 {
327 uint32_t sa_handler__;
328 uint32_t sa_mask;
329 uint32_t sa_flags;
330 uint32_t sa_restorer;
331 } sa32;
332
333 if (umove_or_printaddr(tcp, addr, &sa32))
334 return;
335
336 memset(&sa, 0, sizeof(sa));
337 sa.sa_handler__ = sa32.sa_handler__;
338 sa.sa_flags = sa32.sa_flags;
339 sa.sa_restorer = sa32.sa_restorer;
340 sa.sa_mask = sa32.sa_mask;
341 } else
342 #endif
343 if (umove_or_printaddr(tcp, addr, &sa))
344 return;
345
346 tprints("{sa_handler=");
347 print_sa_handler(sa.sa_handler__);
348 tprints(", sa_mask=");
349 tprint_old_sigmask_val("", sa.sa_mask);
350 tprints(", sa_flags=");
351 printflags(sigact_flags, sa.sa_flags, "SA_???");
352 #if !(defined ALPHA || defined MIPS)
353 if (sa.sa_flags & 0x04000000U) {
354 tprints(", sa_restorer=");
355 printaddr(sa.sa_restorer);
356 }
357 #endif
358 tprints("}");
359 }
360
SYS_FUNC(sigaction)361 SYS_FUNC(sigaction)
362 {
363 if (entering(tcp)) {
364 int signo = tcp->u_arg[0];
365 #if defined SPARC || defined SPARC64
366 if (signo < 0) {
367 tprints("-");
368 signo = -signo;
369 }
370 #endif
371 printsignal(signo);
372 tprints(", ");
373 decode_old_sigaction(tcp, tcp->u_arg[1]);
374 tprints(", ");
375 } else
376 decode_old_sigaction(tcp, tcp->u_arg[2]);
377 return 0;
378 }
379
SYS_FUNC(signal)380 SYS_FUNC(signal)
381 {
382 if (entering(tcp)) {
383 printsignal(tcp->u_arg[0]);
384 tprints(", ");
385 print_sa_handler(tcp->u_arg[1]);
386 return 0;
387 } else if (!syserror(tcp)) {
388 tcp->auxstr = get_sa_handler_str(tcp->u_rval);
389 return RVAL_HEX | RVAL_STR;
390 }
391 return 0;
392 }
393
SYS_FUNC(sgetmask)394 SYS_FUNC(sgetmask)
395 {
396 if (exiting(tcp) && !syserror(tcp)) {
397 tcp->auxstr = sprint_old_sigmask_val("mask ", tcp->u_rval);
398 return RVAL_HEX | RVAL_STR;
399 }
400 return 0;
401 }
402
SYS_FUNC(sigsuspend)403 SYS_FUNC(sigsuspend)
404 {
405 #ifdef MIPS
406 print_sigset_addr_len(tcp, tcp->u_arg[tcp->s_ent->nargs - 1],
407 current_wordsize);
408 #else
409 tprint_old_sigmask_val("", tcp->u_arg[tcp->s_ent->nargs - 1]);
410 #endif
411
412 return RVAL_DECODED;
413 }
414
415 #ifdef ALPHA
416 /*
417 * The OSF/1 sigprocmask is different: it doesn't pass in two pointers,
418 * but rather passes in the new bitmask as an argument and then returns
419 * the old bitmask. This "works" because we only have 64 signals to worry
420 * about. If you want more, use of the rt_sigprocmask syscall is required.
421 *
422 * Alpha:
423 * old = osf_sigprocmask(how, new);
424 * Everyone else:
425 * ret = sigprocmask(how, &new, &old, ...);
426 */
SYS_FUNC(osf_sigprocmask)427 SYS_FUNC(osf_sigprocmask)
428 {
429 if (entering(tcp)) {
430 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
431 tprintsigmask_val(", ", tcp->u_arg[1]);
432 } else if (!syserror(tcp)) {
433 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
434 return RVAL_HEX | RVAL_STR;
435 }
436 return 0;
437 }
438
439 #else /* !ALPHA */
440
441 /* "Old" sigprocmask, which operates with word-sized signal masks */
SYS_FUNC(sigprocmask)442 SYS_FUNC(sigprocmask)
443 {
444 if (entering(tcp)) {
445 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
446 tprints(", ");
447 print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize);
448 tprints(", ");
449 } else {
450 print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize);
451 }
452 return 0;
453 }
454 #endif /* !ALPHA */
455
SYS_FUNC(kill)456 SYS_FUNC(kill)
457 {
458 tprintf("%d, %s",
459 (int) tcp->u_arg[0],
460 signame(tcp->u_arg[1]));
461
462 return RVAL_DECODED;
463 }
464
SYS_FUNC(tgkill)465 SYS_FUNC(tgkill)
466 {
467 tprintf("%d, %d, %s",
468 (int) tcp->u_arg[0],
469 (int) tcp->u_arg[1],
470 signame(tcp->u_arg[2]));
471
472 return RVAL_DECODED;
473 }
474
SYS_FUNC(sigpending)475 SYS_FUNC(sigpending)
476 {
477 if (exiting(tcp))
478 print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize);
479 return 0;
480 }
481
SYS_FUNC(rt_sigprocmask)482 SYS_FUNC(rt_sigprocmask)
483 {
484 /* Note: arg[3] is the length of the sigset. Kernel requires NSIG_BYTES */
485 if (entering(tcp)) {
486 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
487 tprints(", ");
488 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]);
489 tprints(", ");
490 } else {
491 print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]);
492 tprintf(", %" PRI_klu, tcp->u_arg[3]);
493 }
494 return 0;
495 }
496
497 /* Structure describing the action to be taken when a signal arrives. */
498 struct new_sigaction {
499 /* sa_handler may be a libc #define, need to use other name: */
500 #ifdef MIPS
501 unsigned int sa_flags;
502 unsigned long sa_handler__;
503 #else
504 unsigned long sa_handler__;
505 unsigned long sa_flags;
506 #endif /* !MIPS */
507 #if HAVE_SA_RESTORER
508 unsigned long sa_restorer;
509 #endif
510 /* Kernel treats sa_mask as an array of longs. */
511 unsigned long sa_mask[NSIG / sizeof(long)];
512 };
513 /* Same for i386-on-x86_64 and similar cases */
514 struct new_sigaction32 {
515 uint32_t sa_handler__;
516 uint32_t sa_flags;
517 #if HAVE_SA_RESTORER
518 uint32_t sa_restorer;
519 #endif
520 uint32_t sa_mask[2 * (NSIG / sizeof(long))];
521 };
522
523 static void
decode_new_sigaction(struct tcb * const tcp,const kernel_ulong_t addr)524 decode_new_sigaction(struct tcb *const tcp, const kernel_ulong_t addr)
525 {
526 struct new_sigaction sa;
527
528 #ifndef current_wordsize
529 if (current_wordsize < sizeof(sa.sa_handler__)) {
530 struct new_sigaction32 sa32;
531
532 if (umove_or_printaddr(tcp, addr, &sa32))
533 return;
534
535 memset(&sa, 0, sizeof(sa));
536 sa.sa_handler__ = sa32.sa_handler__;
537 sa.sa_flags = sa32.sa_flags;
538 #if HAVE_SA_RESTORER && defined SA_RESTORER
539 sa.sa_restorer = sa32.sa_restorer;
540 #endif
541 /* Kernel treats sa_mask as an array of longs.
542 * For 32-bit process, "long" is uint32_t, thus, for example,
543 * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
544 * But for (64-bit) kernel, 32th bit in sa_mask is
545 * 32th bit in 0th (64-bit) long!
546 * For little-endian, it's the same.
547 * For big-endian, we swap 32-bit words.
548 */
549 sa.sa_mask[0] = ULONG_LONG(sa32.sa_mask[0], sa32.sa_mask[1]);
550 } else
551 #endif
552 if (umove_or_printaddr(tcp, addr, &sa))
553 return;
554
555 tprints("{sa_handler=");
556 print_sa_handler(sa.sa_handler__);
557 tprints(", sa_mask=");
558 /*
559 * Sigset size is in tcp->u_arg[4] (SPARC)
560 * or in tcp->u_arg[3] (all other),
561 * but kernel won't handle sys_rt_sigaction
562 * with wrong sigset size (just returns EINVAL instead).
563 * We just fetch the right size, which is NSIG_BYTES.
564 */
565 tprintsigmask_val("", sa.sa_mask);
566 tprints(", sa_flags=");
567
568 printflags(sigact_flags, sa.sa_flags, "SA_???");
569 #if HAVE_SA_RESTORER && defined SA_RESTORER
570 if (sa.sa_flags & SA_RESTORER) {
571 tprints(", sa_restorer=");
572 printaddr(sa.sa_restorer);
573 }
574 #endif
575 tprints("}");
576 }
577
SYS_FUNC(rt_sigaction)578 SYS_FUNC(rt_sigaction)
579 {
580 if (entering(tcp)) {
581 printsignal(tcp->u_arg[0]);
582 tprints(", ");
583 decode_new_sigaction(tcp, tcp->u_arg[1]);
584 tprints(", ");
585 } else {
586 decode_new_sigaction(tcp, tcp->u_arg[2]);
587 #if defined(SPARC) || defined(SPARC64)
588 tprintf(", %#" PRI_klx ", %" PRI_klu, tcp->u_arg[3], tcp->u_arg[4]);
589 #elif defined(ALPHA)
590 tprintf(", %" PRI_klu ", %#" PRI_klx, tcp->u_arg[3], tcp->u_arg[4]);
591 #else
592 tprintf(", %" PRI_klu, tcp->u_arg[3]);
593 #endif
594 }
595 return 0;
596 }
597
SYS_FUNC(rt_sigpending)598 SYS_FUNC(rt_sigpending)
599 {
600 if (exiting(tcp)) {
601 /*
602 * One of the few syscalls where sigset size (arg[1])
603 * is allowed to be <= NSIG_BYTES, not strictly ==.
604 * This allows non-rt sigpending() syscall
605 * to reuse rt_sigpending() code in kernel.
606 */
607 print_sigset_addr_len_limit(tcp, tcp->u_arg[0],
608 tcp->u_arg[1], 1);
609 tprintf(", %" PRI_klu, tcp->u_arg[1]);
610 }
611 return 0;
612 }
613
SYS_FUNC(rt_sigsuspend)614 SYS_FUNC(rt_sigsuspend)
615 {
616 /* NB: kernel requires arg[1] == NSIG_BYTES */
617 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
618 tprintf(", %" PRI_klu, tcp->u_arg[1]);
619
620 return RVAL_DECODED;
621 }
622
623 static void
print_sigqueueinfo(struct tcb * const tcp,const int sig,const kernel_ulong_t addr)624 print_sigqueueinfo(struct tcb *const tcp, const int sig,
625 const kernel_ulong_t addr)
626 {
627 printsignal(sig);
628 tprints(", ");
629 printsiginfo_at(tcp, addr);
630 }
631
SYS_FUNC(rt_sigqueueinfo)632 SYS_FUNC(rt_sigqueueinfo)
633 {
634 tprintf("%d, ", (int) tcp->u_arg[0]);
635 print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]);
636
637 return RVAL_DECODED;
638 }
639
SYS_FUNC(rt_tgsigqueueinfo)640 SYS_FUNC(rt_tgsigqueueinfo)
641 {
642 tprintf("%d, %d, ", (int) tcp->u_arg[0], (int) tcp->u_arg[1]);
643 print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]);
644
645 return RVAL_DECODED;
646 }
647
SYS_FUNC(rt_sigtimedwait)648 SYS_FUNC(rt_sigtimedwait)
649 {
650 /* NB: kernel requires arg[3] == NSIG_BYTES */
651 if (entering(tcp)) {
652 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]);
653 tprints(", ");
654 if (!(tcp->u_arg[1] && verbose(tcp))) {
655 /*
656 * This is the only "return" parameter,
657 * if we are not going to fetch it on exit,
658 * decode all parameters on entry.
659 */
660 printaddr(tcp->u_arg[1]);
661 tprints(", ");
662 print_timespec(tcp, tcp->u_arg[2]);
663 tprintf(", %" PRI_klu, tcp->u_arg[3]);
664 } else {
665 char *sts = xstrdup(sprint_timespec(tcp, tcp->u_arg[2]));
666 set_tcb_priv_data(tcp, sts, free);
667 }
668 } else {
669 if (tcp->u_arg[1] && verbose(tcp)) {
670 printsiginfo_at(tcp, tcp->u_arg[1]);
671 tprints(", ");
672 tprints(get_tcb_priv_data(tcp));
673 tprintf(", %" PRI_klu, tcp->u_arg[3]);
674 }
675
676 if (!syserror(tcp) && tcp->u_rval) {
677 tcp->auxstr = signame(tcp->u_rval);
678 return RVAL_STR;
679 }
680 }
681 return 0;
682 }
683
SYS_FUNC(restart_syscall)684 SYS_FUNC(restart_syscall)
685 {
686 tprintf("<... resuming interrupted %s ...>",
687 tcp->s_prev_ent ? tcp->s_prev_ent->sys_name : "system call");
688
689 return RVAL_DECODED;
690 }
691