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 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "defs.h"
35 #include <sys/user.h>
36 #include <fcntl.h>
37
38 #ifdef HAVE_SYS_REG_H
39 # include <sys/reg.h>
40 #elif defined(HAVE_LINUX_PTRACE_H)
41 # undef PTRACE_SYSCALL
42 # ifdef HAVE_STRUCT_IA64_FPREG
43 # define ia64_fpreg XXX_ia64_fpreg
44 # endif
45 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
46 # define pt_all_user_regs XXX_pt_all_user_regs
47 # endif
48 # ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS
49 # define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args
50 # endif
51 # include <linux/ptrace.h>
52 # undef ptrace_peeksiginfo_args
53 # undef ia64_fpreg
54 # undef pt_all_user_regs
55 #endif
56
57 #ifdef IA64
58 # include <asm/ptrace_offsets.h>
59 #endif
60
61 #if defined(SPARC) || defined(SPARC64) || defined(MIPS)
62 typedef struct {
63 struct pt_regs si_regs;
64 int si_mask;
65 } m_siginfo_t;
66 #elif defined HAVE_ASM_SIGCONTEXT_H
67 # if !defined(IA64) && !defined(X86_64) && !defined(X32)
68 # include <asm/sigcontext.h>
69 # endif
70 #else /* !HAVE_ASM_SIGCONTEXT_H */
71 # if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT
72 struct sigcontext {
73 unsigned long sc_mask;
74 unsigned long sc_usp;
75 unsigned long sc_d0;
76 unsigned long sc_d1;
77 unsigned long sc_a0;
78 unsigned long sc_a1;
79 unsigned short sc_sr;
80 unsigned long sc_pc;
81 unsigned short sc_formatvec;
82 };
83 # endif /* M68K */
84 #endif /* !HAVE_ASM_SIGCONTEXT_H */
85
86 #ifndef NSIG
87 # warning: NSIG is not defined, using 32
88 # define NSIG 32
89 #elif NSIG < 32
90 # error: NSIG < 32
91 #endif
92
93 #ifdef HAVE_SIGACTION
94
95 /* The libc headers do not define this constant since it should only be
96 used by the implementation. So we define it here. */
97 #ifndef SA_RESTORER
98 # ifdef ASM_SA_RESTORER
99 # define SA_RESTORER ASM_SA_RESTORER
100 # endif
101 #endif
102
103 #include "xlat/sigact_flags.h"
104 #include "xlat/sigprocmaskcmds.h"
105
106 #endif /* HAVE_SIGACTION */
107
108 /* Anonymous realtime signals. */
109 /* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a
110 constant. This is what we want. Otherwise, just use SIGRTMIN. */
111 #ifdef SIGRTMIN
112 #ifndef __SIGRTMIN
113 #define __SIGRTMIN SIGRTMIN
114 #define __SIGRTMAX SIGRTMAX /* likewise */
115 #endif
116 #endif
117
118 /* Note on the size of sigset_t:
119 *
120 * In glibc, sigset_t is an array with space for 1024 bits (!),
121 * even though all arches supported by Linux have only 64 signals
122 * except MIPS, which has 128. IOW, it is 128 bytes long.
123 *
124 * In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long).
125 * However, some old syscall return only 32 lower bits (one word).
126 * Example: sys_sigpending vs sys_rt_sigpending.
127 *
128 * Be aware of this fact when you try to
129 * memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t))
130 * - sizeof(sigset_t) is much bigger than you think,
131 * it may overflow tcp->u_arg[] array, and it may try to copy more data
132 * than is really available in <something>.
133 * Similarly,
134 * umoven(tcp, addr, sizeof(sigset_t), &sigset)
135 * may be a bad idea: it'll try to read much more data than needed
136 * to fetch a sigset_t.
137 * Use (NSIG / 8) as a size instead.
138 */
139
140 const char *
signame(int sig)141 signame(int sig)
142 {
143 static char buf[sizeof("SIGRT_%d") + sizeof(int)*3];
144
145 if (sig >= 0 && sig < nsignals)
146 return signalent[sig];
147 #ifdef SIGRTMIN
148 if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) {
149 sprintf(buf, "SIGRT_%d", (int)(sig - __SIGRTMIN));
150 return buf;
151 }
152 #endif
153 sprintf(buf, "%d", sig);
154 return buf;
155 }
156
157 static unsigned int
popcount32(const uint32_t * a,unsigned int size)158 popcount32(const uint32_t *a, unsigned int size)
159 {
160 unsigned int count = 0;
161
162 for (; size; ++a, --size) {
163 uint32_t x = *a;
164
165 #ifdef HAVE___BUILTIN_POPCOUNT
166 count += __builtin_popcount(x);
167 #else
168 for (; x; ++count)
169 x &= x - 1;
170 #endif
171 }
172
173 return count;
174 }
175
176 static const char *
sprintsigmask_n(const char * prefix,const void * sig_mask,unsigned int bytes)177 sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes)
178 {
179 /*
180 * The maximum number of signal names to be printed is NSIG * 2 / 3.
181 * Most of signal names have length 7,
182 * average length of signal names is less than 7.
183 * The length of prefix string does not exceed 16.
184 */
185 static char outstr[128 + 8 * (NSIG * 2 / 3)];
186
187 char *s;
188 const uint32_t *mask;
189 uint32_t inverted_mask[NSIG / 32];
190 unsigned int size;
191 int i;
192 char sep;
193
194 s = stpcpy(outstr, prefix);
195
196 mask = sig_mask;
197 /* length of signal mask in 4-byte words */
198 size = (bytes >= NSIG / 8) ? NSIG / 32 : (bytes + 3) / 4;
199
200 /* check whether 2/3 or more bits are set */
201 if (popcount32(mask, size) >= size * 32 * 2 / 3) {
202 /* show those signals that are NOT in the mask */
203 unsigned int j;
204 for (j = 0; j < size; ++j)
205 inverted_mask[j] = ~mask[j];
206 mask = inverted_mask;
207 *s++ = '~';
208 }
209
210 sep = '[';
211 for (i = 0; (i = next_set_bit(mask, i, size * 32)) >= 0; ) {
212 ++i;
213 *s++ = sep;
214 if (i < nsignals) {
215 s = stpcpy(s, signalent[i] + 3);
216 }
217 #ifdef SIGRTMIN
218 else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
219 s += sprintf(s, "RT_%u", i - __SIGRTMIN);
220 }
221 #endif
222 else {
223 s += sprintf(s, "%u", i);
224 }
225 sep = ' ';
226 }
227 if (sep == '[')
228 *s++ = sep;
229 *s++ = ']';
230 *s = '\0';
231 return outstr;
232 }
233
234 #define tprintsigmask_addr(prefix, mask) \
235 tprints(sprintsigmask_n((prefix), (mask), sizeof(mask)))
236
237 #define sprintsigmask_val(prefix, mask) \
238 sprintsigmask_n((prefix), &(mask), sizeof(mask))
239
240 #define tprintsigmask_val(prefix, mask) \
241 tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask)))
242
243 void
printsignal(int nr)244 printsignal(int nr)
245 {
246 tprints(signame(nr));
247 }
248
249 void
print_sigset_addr_len(struct tcb * tcp,long addr,long len)250 print_sigset_addr_len(struct tcb *tcp, long addr, long len)
251 {
252 char mask[NSIG / 8];
253
254 if (!addr) {
255 tprints("NULL");
256 return;
257 }
258 /* Here len is usually equals NSIG / 8 or current_wordsize.
259 * But we code this defensively:
260 */
261 if (len < 0) {
262 bad:
263 tprintf("%#lx", addr);
264 return;
265 }
266 if (len >= NSIG / 8)
267 len = NSIG / 8;
268 else
269 len = (len + 3) & ~3;
270
271 if (umoven(tcp, addr, len, mask) < 0)
272 goto bad;
273 tprints(sprintsigmask_n("", mask, len));
274 }
275
276 #ifndef ILL_ILLOPC
277 #define ILL_ILLOPC 1 /* illegal opcode */
278 #define ILL_ILLOPN 2 /* illegal operand */
279 #define ILL_ILLADR 3 /* illegal addressing mode */
280 #define ILL_ILLTRP 4 /* illegal trap */
281 #define ILL_PRVOPC 5 /* privileged opcode */
282 #define ILL_PRVREG 6 /* privileged register */
283 #define ILL_COPROC 7 /* coprocessor error */
284 #define ILL_BADSTK 8 /* internal stack error */
285 #define FPE_INTDIV 1 /* integer divide by zero */
286 #define FPE_INTOVF 2 /* integer overflow */
287 #define FPE_FLTDIV 3 /* floating point divide by zero */
288 #define FPE_FLTOVF 4 /* floating point overflow */
289 #define FPE_FLTUND 5 /* floating point underflow */
290 #define FPE_FLTRES 6 /* floating point inexact result */
291 #define FPE_FLTINV 7 /* floating point invalid operation */
292 #define FPE_FLTSUB 8 /* subscript out of range */
293 #define SEGV_MAPERR 1 /* address not mapped to object */
294 #define SEGV_ACCERR 2 /* invalid permissions for mapped object */
295 #define BUS_ADRALN 1 /* invalid address alignment */
296 #define BUS_ADRERR 2 /* non-existant physical address */
297 #define BUS_OBJERR 3 /* object specific hardware error */
298 #define SYS_SECCOMP 1 /* seccomp triggered */
299 #define TRAP_BRKPT 1 /* process breakpoint */
300 #define TRAP_TRACE 2 /* process trace trap */
301 #define CLD_EXITED 1 /* child has exited */
302 #define CLD_KILLED 2 /* child was killed */
303 #define CLD_DUMPED 3 /* child terminated abnormally */
304 #define CLD_TRAPPED 4 /* traced child has trapped */
305 #define CLD_STOPPED 5 /* child has stopped */
306 #define CLD_CONTINUED 6 /* stopped child has continued */
307 #define POLL_IN 1 /* data input available */
308 #define POLL_OUT 2 /* output buffers available */
309 #define POLL_MSG 3 /* input message available */
310 #define POLL_ERR 4 /* i/o error */
311 #define POLL_PRI 5 /* high priority input available */
312 #define POLL_HUP 6 /* device disconnected */
313 #define SI_KERNEL 0x80 /* sent by kernel */
314 #define SI_USER 0 /* sent by kill, sigsend, raise */
315 #define SI_QUEUE -1 /* sent by sigqueue */
316 #define SI_TIMER -2 /* sent by timer expiration */
317 #define SI_MESGQ -3 /* sent by real time mesq state change */
318 #define SI_ASYNCIO -4 /* sent by AIO completion */
319 #define SI_SIGIO -5 /* sent by SIGIO */
320 #define SI_TKILL -6 /* sent by tkill */
321 #define SI_DETHREAD -7 /* sent by execve killing subsidiary threads */
322 #define SI_ASYNCNL -60 /* sent by asynch name lookup completion */
323 #endif
324
325 #ifndef SI_FROMUSER
326 # define SI_FROMUSER(sip) ((sip)->si_code <= 0)
327 #endif
328
329 #include "xlat/siginfo_codes.h"
330 #include "xlat/sigill_codes.h"
331 #include "xlat/sigfpe_codes.h"
332 #include "xlat/sigtrap_codes.h"
333 #include "xlat/sigchld_codes.h"
334 #include "xlat/sigpoll_codes.h"
335 #include "xlat/sigprof_codes.h"
336
337 #ifdef SIGEMT
338 #include "xlat/sigemt_codes.h"
339 #endif
340
341 #include "xlat/sigsegv_codes.h"
342 #include "xlat/sigbus_codes.h"
343
344 #ifndef SYS_SECCOMP
345 # define SYS_SECCOMP 1
346 #endif
347 #include "xlat/sigsys_codes.h"
348
349 static void
printsigsource(const siginfo_t * sip)350 printsigsource(const siginfo_t *sip)
351 {
352 tprintf(", si_pid=%lu, si_uid=%lu",
353 (unsigned long) sip->si_pid,
354 (unsigned long) sip->si_uid);
355 }
356
357 static void
printsigval(const siginfo_t * sip,int verbose)358 printsigval(const siginfo_t *sip, int verbose)
359 {
360 if (!verbose)
361 tprints(", ...");
362 else
363 tprintf(", si_value={int=%u, ptr=%#lx}",
364 sip->si_int,
365 (unsigned long) sip->si_ptr);
366 }
367
368 void
printsiginfo(siginfo_t * sip,int verbose)369 printsiginfo(siginfo_t *sip, int verbose)
370 {
371 const char *code;
372
373 if (sip->si_signo == 0) {
374 tprints("{}");
375 return;
376 }
377 tprints("{si_signo=");
378 printsignal(sip->si_signo);
379 code = xlookup(siginfo_codes, sip->si_code);
380 if (!code) {
381 switch (sip->si_signo) {
382 case SIGTRAP:
383 code = xlookup(sigtrap_codes, sip->si_code);
384 break;
385 case SIGCHLD:
386 code = xlookup(sigchld_codes, sip->si_code);
387 break;
388 case SIGPOLL:
389 code = xlookup(sigpoll_codes, sip->si_code);
390 break;
391 case SIGPROF:
392 code = xlookup(sigprof_codes, sip->si_code);
393 break;
394 case SIGILL:
395 code = xlookup(sigill_codes, sip->si_code);
396 break;
397 #ifdef SIGEMT
398 case SIGEMT:
399 code = xlookup(sigemt_codes, sip->si_code);
400 break;
401 #endif
402 case SIGFPE:
403 code = xlookup(sigfpe_codes, sip->si_code);
404 break;
405 case SIGSEGV:
406 code = xlookup(sigsegv_codes, sip->si_code);
407 break;
408 case SIGBUS:
409 code = xlookup(sigbus_codes, sip->si_code);
410 break;
411 case SIGSYS:
412 code = xlookup(sigsys_codes, sip->si_code);
413 break;
414 }
415 }
416 if (code)
417 tprintf(", si_code=%s", code);
418 else
419 tprintf(", si_code=%#x", sip->si_code);
420 #ifdef SI_NOINFO
421 if (sip->si_code != SI_NOINFO)
422 #endif
423 {
424 if (sip->si_errno) {
425 if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
426 tprintf(", si_errno=%d", sip->si_errno);
427 else
428 tprintf(", si_errno=%s",
429 errnoent[sip->si_errno]);
430 }
431 #ifdef SI_FROMUSER
432 if (SI_FROMUSER(sip)) {
433 switch (sip->si_code) {
434 #ifdef SI_USER
435 case SI_USER:
436 printsigsource(sip);
437 break;
438 #endif
439 #ifdef SI_TKILL
440 case SI_TKILL:
441 printsigsource(sip);
442 break;
443 #endif
444 #ifdef SI_TIMER
445 case SI_TIMER:
446 tprintf(", si_timerid=%#x, si_overrun=%d",
447 sip->si_timerid, sip->si_overrun);
448 printsigval(sip, verbose);
449 break;
450 #endif
451 default:
452 printsigsource(sip);
453 if (sip->si_ptr)
454 printsigval(sip, verbose);
455 break;
456 }
457 }
458 else
459 #endif /* SI_FROMUSER */
460 {
461 switch (sip->si_signo) {
462 case SIGCHLD:
463 printsigsource(sip);
464 tprints(", si_status=");
465 if (sip->si_code == CLD_EXITED)
466 tprintf("%d", sip->si_status);
467 else
468 printsignal(sip->si_status);
469 if (!verbose)
470 tprints(", ...");
471 else
472 tprintf(", si_utime=%llu, si_stime=%llu",
473 (unsigned long long) sip->si_utime,
474 (unsigned long long) sip->si_stime);
475 break;
476 case SIGILL: case SIGFPE:
477 case SIGSEGV: case SIGBUS:
478 tprintf(", si_addr=%#lx",
479 (unsigned long) sip->si_addr);
480 break;
481 case SIGPOLL:
482 switch (sip->si_code) {
483 case POLL_IN: case POLL_OUT: case POLL_MSG:
484 tprintf(", si_band=%ld",
485 (long) sip->si_band);
486 break;
487 }
488 break;
489 #ifdef HAVE_SIGINFO_T_SI_SYSCALL
490 case SIGSYS:
491 tprintf(", si_call_addr=%#lx, si_syscall=%d, si_arch=%u",
492 (unsigned long) sip->si_call_addr,
493 sip->si_syscall, sip->si_arch);
494 break;
495 #endif
496 default:
497 if (sip->si_pid || sip->si_uid)
498 printsigsource(sip);
499 if (sip->si_ptr)
500 printsigval(sip, verbose);
501 }
502 }
503 }
504 tprints("}");
505 }
506
507 void
printsiginfo_at(struct tcb * tcp,long addr)508 printsiginfo_at(struct tcb *tcp, long addr)
509 {
510 siginfo_t si;
511 if (!addr) {
512 tprints("NULL");
513 return;
514 }
515 if (syserror(tcp)) {
516 tprintf("%#lx", addr);
517 return;
518 }
519 if (umove(tcp, addr, &si) < 0) {
520 tprints("{???}");
521 return;
522 }
523 printsiginfo(&si, verbose(tcp));
524 }
525
526 int
sys_sigsetmask(struct tcb * tcp)527 sys_sigsetmask(struct tcb *tcp)
528 {
529 if (entering(tcp)) {
530 tprintsigmask_val("", tcp->u_arg[0]);
531 }
532 else if (!syserror(tcp)) {
533 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
534 return RVAL_HEX | RVAL_STR;
535 }
536 return 0;
537 }
538
539 #ifdef HAVE_SIGACTION
540
541 struct old_sigaction {
542 /* sa_handler may be a libc #define, need to use other name: */
543 #ifdef MIPS
544 unsigned int sa_flags;
545 void (*__sa_handler)(int);
546 /* Kernel treats sa_mask as an array of longs. */
547 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
548 #else
549 void (*__sa_handler)(int);
550 unsigned long sa_mask;
551 unsigned long sa_flags;
552 void (*sa_restorer)(void);
553 #endif /* !MIPS */
554 };
555
556 struct old_sigaction32 {
557 /* sa_handler may be a libc #define, need to use other name: */
558 uint32_t __sa_handler;
559 uint32_t sa_mask;
560 uint32_t sa_flags;
561 uint32_t sa_restorer;
562 };
563
564 static void
decode_old_sigaction(struct tcb * tcp,long addr)565 decode_old_sigaction(struct tcb *tcp, long addr)
566 {
567 struct old_sigaction sa;
568 int r;
569
570 if (!addr) {
571 tprints("NULL");
572 return;
573 }
574 if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) {
575 tprintf("%#lx", addr);
576 return;
577 }
578
579 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
580 if (current_wordsize != sizeof(sa.__sa_handler) && current_wordsize == 4) {
581 struct old_sigaction32 sa32;
582 r = umove(tcp, addr, &sa32);
583 if (r >= 0) {
584 memset(&sa, 0, sizeof(sa));
585 sa.__sa_handler = (void*)(uintptr_t)sa32.__sa_handler;
586 sa.sa_flags = sa32.sa_flags;
587 sa.sa_restorer = (void*)(uintptr_t)sa32.sa_restorer;
588 sa.sa_mask = sa32.sa_mask;
589 }
590 } else
591 #endif
592 {
593 r = umove(tcp, addr, &sa);
594 }
595 if (r < 0) {
596 tprints("{...}");
597 return;
598 }
599
600 /* Architectures using function pointers, like
601 * hppa, may need to manipulate the function pointer
602 * to compute the result of a comparison. However,
603 * the __sa_handler function pointer exists only in
604 * the address space of the traced process, and can't
605 * be manipulated by strace. In order to prevent the
606 * compiler from generating code to manipulate
607 * __sa_handler we cast the function pointers to long. */
608 if ((long)sa.__sa_handler == (long)SIG_ERR)
609 tprints("{SIG_ERR, ");
610 else if ((long)sa.__sa_handler == (long)SIG_DFL)
611 tprints("{SIG_DFL, ");
612 else if ((long)sa.__sa_handler == (long)SIG_IGN)
613 tprints("{SIG_IGN, ");
614 else
615 tprintf("{%#lx, ", (long) sa.__sa_handler);
616 #ifdef MIPS
617 tprintsigmask_addr("", sa.sa_mask);
618 #else
619 tprintsigmask_val("", sa.sa_mask);
620 #endif
621 tprints(", ");
622 printflags(sigact_flags, sa.sa_flags, "SA_???");
623 #ifdef SA_RESTORER
624 if (sa.sa_flags & SA_RESTORER)
625 tprintf(", %p", sa.sa_restorer);
626 #endif
627 tprints("}");
628 }
629
630 int
sys_sigaction(struct tcb * tcp)631 sys_sigaction(struct tcb *tcp)
632 {
633 if (entering(tcp)) {
634 printsignal(tcp->u_arg[0]);
635 tprints(", ");
636 decode_old_sigaction(tcp, tcp->u_arg[1]);
637 tprints(", ");
638 } else
639 decode_old_sigaction(tcp, tcp->u_arg[2]);
640 return 0;
641 }
642
643 int
sys_signal(struct tcb * tcp)644 sys_signal(struct tcb *tcp)
645 {
646 if (entering(tcp)) {
647 printsignal(tcp->u_arg[0]);
648 tprints(", ");
649 switch (tcp->u_arg[1]) {
650 case (long) SIG_ERR:
651 tprints("SIG_ERR");
652 break;
653 case (long) SIG_DFL:
654 tprints("SIG_DFL");
655 break;
656 case (long) SIG_IGN:
657 tprints("SIG_IGN");
658 break;
659 default:
660 tprintf("%#lx", tcp->u_arg[1]);
661 }
662 return 0;
663 }
664 else if (!syserror(tcp)) {
665 switch (tcp->u_rval) {
666 case (long) SIG_ERR:
667 tcp->auxstr = "SIG_ERR"; break;
668 case (long) SIG_DFL:
669 tcp->auxstr = "SIG_DFL"; break;
670 case (long) SIG_IGN:
671 tcp->auxstr = "SIG_IGN"; break;
672 default:
673 tcp->auxstr = NULL;
674 }
675 return RVAL_HEX | RVAL_STR;
676 }
677 return 0;
678 }
679
680 #endif /* HAVE_SIGACTION */
681
682 int
sys_sigreturn(struct tcb * tcp)683 sys_sigreturn(struct tcb *tcp)
684 {
685 #if defined(ARM)
686 if (entering(tcp)) {
687 struct arm_sigcontext {
688 unsigned long trap_no;
689 unsigned long error_code;
690 unsigned long oldmask;
691 unsigned long arm_r0;
692 unsigned long arm_r1;
693 unsigned long arm_r2;
694 unsigned long arm_r3;
695 unsigned long arm_r4;
696 unsigned long arm_r5;
697 unsigned long arm_r6;
698 unsigned long arm_r7;
699 unsigned long arm_r8;
700 unsigned long arm_r9;
701 unsigned long arm_r10;
702 unsigned long arm_fp;
703 unsigned long arm_ip;
704 unsigned long arm_sp;
705 unsigned long arm_lr;
706 unsigned long arm_pc;
707 unsigned long arm_cpsr;
708 unsigned long fault_address;
709 };
710 struct arm_ucontext {
711 unsigned long uc_flags;
712 unsigned long uc_link; /* struct ucontext* */
713 /* The next three members comprise stack_t struct: */
714 unsigned long ss_sp; /* void* */
715 unsigned long ss_flags; /* int */
716 unsigned long ss_size; /* size_t */
717 struct arm_sigcontext sc;
718 /* These two members are sigset_t: */
719 unsigned long uc_sigmask[2];
720 /* more fields follow, which we aren't interested in */
721 };
722 struct arm_ucontext uc;
723 if (umove(tcp, arm_regs.ARM_sp, &uc) < 0)
724 return 0;
725 /*
726 * Kernel fills out uc.sc.oldmask too when it sets up signal stack,
727 * but for sigmask restore, sigreturn syscall uses uc.uc_sigmask instead.
728 */
729 tprintsigmask_addr(") (mask ", uc.uc_sigmask);
730 }
731 #elif defined(S390) || defined(S390X)
732 if (entering(tcp)) {
733 long usp;
734 struct sigcontext sc;
735 if (upeek(tcp->pid, PT_GPR15, &usp) < 0)
736 return 0;
737 if (umove(tcp, usp + __SIGNAL_FRAMESIZE, &sc) < 0)
738 return 0;
739 tprintsigmask_addr(") (mask ", sc.oldmask);
740 }
741 #elif defined(I386) || defined(X86_64)
742 # if defined(X86_64)
743 if (current_personality == 0) /* 64-bit */
744 return 0;
745 # endif
746 if (entering(tcp)) {
747 struct i386_sigcontext_struct {
748 uint16_t gs, __gsh;
749 uint16_t fs, __fsh;
750 uint16_t es, __esh;
751 uint16_t ds, __dsh;
752 uint32_t edi;
753 uint32_t esi;
754 uint32_t ebp;
755 uint32_t esp;
756 uint32_t ebx;
757 uint32_t edx;
758 uint32_t ecx;
759 uint32_t eax;
760 uint32_t trapno;
761 uint32_t err;
762 uint32_t eip;
763 uint16_t cs, __csh;
764 uint32_t eflags;
765 uint32_t esp_at_signal;
766 uint16_t ss, __ssh;
767 uint32_t i387;
768 uint32_t oldmask;
769 uint32_t cr2;
770 };
771 struct i386_fpstate {
772 uint32_t cw;
773 uint32_t sw;
774 uint32_t tag;
775 uint32_t ipoff;
776 uint32_t cssel;
777 uint32_t dataoff;
778 uint32_t datasel;
779 uint8_t st[8][10]; /* 8*10 bytes: FP regs */
780 uint16_t status;
781 uint16_t magic;
782 uint32_t fxsr_env[6];
783 uint32_t mxcsr;
784 uint32_t reserved;
785 uint8_t stx[8][16]; /* 8*16 bytes: FP regs, each padded to 16 bytes */
786 uint8_t xmm[8][16]; /* 8 XMM regs */
787 uint32_t padding1[44];
788 uint32_t padding2[12]; /* union with struct _fpx_sw_bytes */
789 };
790 struct {
791 struct i386_sigcontext_struct sc;
792 struct i386_fpstate fp;
793 uint32_t extramask[1];
794 } signal_stack;
795 /* On i386, sc is followed on stack by struct fpstate
796 * and after it an additional u32 extramask[1] which holds
797 * upper half of the mask.
798 */
799 uint32_t sigmask[2];
800 if (umove(tcp, *i386_esp_ptr, &signal_stack) < 0)
801 return 0;
802 sigmask[0] = signal_stack.sc.oldmask;
803 sigmask[1] = signal_stack.extramask[0];
804 tprintsigmask_addr(") (mask ", sigmask);
805 }
806 #elif defined(IA64)
807 if (entering(tcp)) {
808 struct sigcontext sc;
809 long sp;
810 /* offset of sigcontext in the kernel's sigframe structure: */
811 # define SIGFRAME_SC_OFFSET 0x90
812 if (upeek(tcp->pid, PT_R12, &sp) < 0)
813 return 0;
814 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
815 return 0;
816 tprintsigmask_val(") (mask ", sc.sc_mask);
817 }
818 #elif defined(POWERPC)
819 if (entering(tcp)) {
820 long esp;
821 struct sigcontext sc;
822
823 esp = ppc_regs.gpr[1];
824
825 /* Skip dummy stack frame. */
826 #ifdef POWERPC64
827 if (current_personality == 0)
828 esp += 128;
829 else
830 esp += 64;
831 #else
832 esp += 64;
833 #endif
834 if (umove(tcp, esp, &sc) < 0)
835 return 0;
836 tprintsigmask_val(") (mask ", sc.oldmask);
837 }
838 #elif defined(M68K)
839 if (entering(tcp)) {
840 long usp;
841 struct sigcontext sc;
842 if (upeek(tcp->pid, 4*PT_USP, &usp) < 0)
843 return 0;
844 if (umove(tcp, usp, &sc) < 0)
845 return 0;
846 tprintsigmask_val(") (mask ", sc.sc_mask);
847 }
848 #elif defined(ALPHA)
849 if (entering(tcp)) {
850 long fp;
851 struct sigcontext sc;
852 if (upeek(tcp->pid, REG_FP, &fp) < 0)
853 return 0;
854 if (umove(tcp, fp, &sc) < 0)
855 return 0;
856 tprintsigmask_val(") (mask ", sc.sc_mask);
857 }
858 #elif defined(SPARC) || defined(SPARC64)
859 if (entering(tcp)) {
860 long i1;
861 m_siginfo_t si;
862 i1 = sparc_regs.u_regs[U_REG_O1];
863 if (umove(tcp, i1, &si) < 0) {
864 perror_msg("sigreturn: umove");
865 return 0;
866 }
867 tprintsigmask_val(") (mask ", si.si_mask);
868 }
869 #elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64)
870 /* This decodes rt_sigreturn. The 64-bit ABIs do not have
871 sigreturn. */
872 if (entering(tcp)) {
873 long sp;
874 struct ucontext uc;
875 if (upeek(tcp->pid, REG_SP, &sp) < 0)
876 return 0;
877 /* There are six words followed by a 128-byte siginfo. */
878 sp = sp + 6 * 4 + 128;
879 if (umove(tcp, sp, &uc) < 0)
880 return 0;
881 tprintsigmask_val(") (mask ", uc.uc_sigmask);
882 }
883 #elif defined(MIPS)
884 if (entering(tcp)) {
885 long sp;
886 struct pt_regs regs;
887 m_siginfo_t si;
888 if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)®s, 0) < 0) {
889 perror_msg("sigreturn: PTRACE_GETREGS");
890 return 0;
891 }
892 sp = regs.regs[29];
893 if (umove(tcp, sp, &si) < 0)
894 return 0;
895 tprintsigmask_val(") (mask ", si.si_mask);
896 }
897 #elif defined(CRISV10) || defined(CRISV32)
898 if (entering(tcp)) {
899 struct sigcontext sc;
900 long regs[PT_MAX+1];
901 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
902 perror_msg("sigreturn: PTRACE_GETREGS");
903 return 0;
904 }
905 if (umove(tcp, regs[PT_USP], &sc) < 0)
906 return 0;
907 tprintsigmask_val(") (mask ", sc.oldmask);
908 }
909 #elif defined(TILE)
910 if (entering(tcp)) {
911 struct ucontext uc;
912
913 /* offset of ucontext in the kernel's sigframe structure */
914 # define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(siginfo_t)
915 if (umove(tcp, tile_regs.sp + SIGFRAME_UC_OFFSET, &uc) < 0)
916 return 0;
917 tprintsigmask_val(") (mask ", uc.uc_sigmask);
918 }
919 #elif defined(MICROBLAZE)
920 /* TODO: Verify that this is correct... */
921 if (entering(tcp)) {
922 struct sigcontext sc;
923 long sp;
924 /* Read r1, the stack pointer. */
925 if (upeek(tcp->pid, 1 * 4, &sp) < 0)
926 return 0;
927 if (umove(tcp, sp, &sc) < 0)
928 return 0;
929 tprintsigmask_val(") (mask ", sc.oldmask);
930 }
931 #elif defined(XTENSA)
932 /* Xtensa only has rt_sys_sigreturn */
933 #elif defined(ARC)
934 /* ARC syscall ABI only supports rt_sys_sigreturn */
935 #else
936 # warning No sys_sigreturn() for this architecture
937 # warning (no problem, just a reminder :-)
938 #endif
939 return 0;
940 }
941
942 int
sys_siggetmask(struct tcb * tcp)943 sys_siggetmask(struct tcb *tcp)
944 {
945 if (exiting(tcp)) {
946 tcp->auxstr = sprintsigmask_val("mask ", tcp->u_rval);
947 }
948 return RVAL_HEX | RVAL_STR;
949 }
950
951 int
sys_sigsuspend(struct tcb * tcp)952 sys_sigsuspend(struct tcb *tcp)
953 {
954 if (entering(tcp)) {
955 tprintsigmask_val("", tcp->u_arg[2]);
956 }
957 return 0;
958 }
959
960 #if !defined SS_ONSTACK
961 #define SS_ONSTACK 1
962 #define SS_DISABLE 2
963 #endif
964
965 #include "xlat/sigaltstack_flags.h"
966
967 static void
print_stack_t(struct tcb * tcp,unsigned long addr)968 print_stack_t(struct tcb *tcp, unsigned long addr)
969 {
970 stack_t ss;
971 int r;
972
973 if (!addr) {
974 tprints("NULL");
975 return;
976 }
977
978 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
979 if (current_wordsize != sizeof(ss.ss_sp) && current_wordsize == 4) {
980 struct {
981 uint32_t ss_sp;
982 int32_t ss_flags;
983 uint32_t ss_size;
984 } ss32;
985 r = umove(tcp, addr, &ss32);
986 if (r >= 0) {
987 memset(&ss, 0, sizeof(ss));
988 ss.ss_sp = (void*)(unsigned long) ss32.ss_sp;
989 ss.ss_flags = ss32.ss_flags;
990 ss.ss_size = (unsigned long) ss32.ss_size;
991 }
992 } else
993 #endif
994 {
995 r = umove(tcp, addr, &ss);
996 }
997 if (r < 0) {
998 tprintf("%#lx", addr);
999 } else {
1000 tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1001 printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1002 tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1003 }
1004 }
1005
1006 int
sys_sigaltstack(struct tcb * tcp)1007 sys_sigaltstack(struct tcb *tcp)
1008 {
1009 if (entering(tcp)) {
1010 print_stack_t(tcp, tcp->u_arg[0]);
1011 }
1012 else {
1013 tprints(", ");
1014 print_stack_t(tcp, tcp->u_arg[1]);
1015 }
1016 return 0;
1017 }
1018
1019 #ifdef HAVE_SIGACTION
1020
1021 /* "Old" sigprocmask, which operates with word-sized signal masks */
1022 int
sys_sigprocmask(struct tcb * tcp)1023 sys_sigprocmask(struct tcb *tcp)
1024 {
1025 # ifdef ALPHA
1026 if (entering(tcp)) {
1027 /*
1028 * Alpha/OSF is different: it doesn't pass in two pointers,
1029 * but rather passes in the new bitmask as an argument and
1030 * then returns the old bitmask. This "works" because we
1031 * only have 64 signals to worry about. If you want more,
1032 * use of the rt_sigprocmask syscall is required.
1033 * Alpha:
1034 * old = osf_sigprocmask(how, new);
1035 * Everyone else:
1036 * ret = sigprocmask(how, &new, &old, ...);
1037 */
1038 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1039 tprintsigmask_val(", ", tcp->u_arg[1]);
1040 }
1041 else if (!syserror(tcp)) {
1042 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
1043 return RVAL_HEX | RVAL_STR;
1044 }
1045 # else /* !ALPHA */
1046 if (entering(tcp)) {
1047 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1048 tprints(", ");
1049 print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize);
1050 tprints(", ");
1051 }
1052 else {
1053 if (syserror(tcp))
1054 tprintf("%#lx", tcp->u_arg[2]);
1055 else
1056 print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize);
1057 }
1058 # endif /* !ALPHA */
1059 return 0;
1060 }
1061
1062 #endif /* HAVE_SIGACTION */
1063
1064 int
sys_kill(struct tcb * tcp)1065 sys_kill(struct tcb *tcp)
1066 {
1067 if (entering(tcp)) {
1068 tprintf("%ld, %s",
1069 widen_to_long(tcp->u_arg[0]),
1070 signame(tcp->u_arg[1])
1071 );
1072 }
1073 return 0;
1074 }
1075
1076 int
sys_tgkill(struct tcb * tcp)1077 sys_tgkill(struct tcb *tcp)
1078 {
1079 if (entering(tcp)) {
1080 tprintf("%ld, %ld, %s",
1081 widen_to_long(tcp->u_arg[0]),
1082 widen_to_long(tcp->u_arg[1]),
1083 signame(tcp->u_arg[2])
1084 );
1085 }
1086 return 0;
1087 }
1088
1089 int
sys_sigpending(struct tcb * tcp)1090 sys_sigpending(struct tcb *tcp)
1091 {
1092 if (exiting(tcp)) {
1093 if (syserror(tcp))
1094 tprintf("%#lx", tcp->u_arg[0]);
1095 else
1096 print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize);
1097 }
1098 return 0;
1099 }
1100
1101 int
sys_rt_sigprocmask(struct tcb * tcp)1102 sys_rt_sigprocmask(struct tcb *tcp)
1103 {
1104 /* Note: arg[3] is the length of the sigset. Kernel requires NSIG / 8 */
1105 if (entering(tcp)) {
1106 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1107 tprints(", ");
1108 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]);
1109 tprints(", ");
1110 }
1111 else {
1112 if (syserror(tcp))
1113 tprintf("%#lx", tcp->u_arg[2]);
1114 else
1115 print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]);
1116 tprintf(", %lu", tcp->u_arg[3]);
1117 }
1118 return 0;
1119 }
1120
1121 /* Structure describing the action to be taken when a signal arrives. */
1122 struct new_sigaction
1123 {
1124 /* sa_handler may be a libc #define, need to use other name: */
1125 #ifdef MIPS
1126 unsigned int sa_flags;
1127 void (*__sa_handler)(int);
1128 #else
1129 void (*__sa_handler)(int);
1130 unsigned long sa_flags;
1131 void (*sa_restorer)(void);
1132 #endif /* !MIPS */
1133 /* Kernel treats sa_mask as an array of longs. */
1134 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1135 };
1136 /* Same for i386-on-x86_64 and similar cases */
1137 struct new_sigaction32
1138 {
1139 uint32_t __sa_handler;
1140 uint32_t sa_flags;
1141 uint32_t sa_restorer;
1142 uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1143 };
1144
1145 static void
decode_new_sigaction(struct tcb * tcp,long addr)1146 decode_new_sigaction(struct tcb *tcp, long addr)
1147 {
1148 struct new_sigaction sa;
1149 int r;
1150
1151 if (!addr) {
1152 tprints("NULL");
1153 return;
1154 }
1155 if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) {
1156 tprintf("%#lx", addr);
1157 return;
1158 }
1159 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1160 if (current_wordsize != sizeof(sa.sa_flags) && current_wordsize == 4) {
1161 struct new_sigaction32 sa32;
1162 r = umove(tcp, addr, &sa32);
1163 if (r >= 0) {
1164 memset(&sa, 0, sizeof(sa));
1165 sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1166 sa.sa_flags = sa32.sa_flags;
1167 sa.sa_restorer = (void*)(unsigned long)sa32.sa_restorer;
1168 /* Kernel treats sa_mask as an array of longs.
1169 * For 32-bit process, "long" is uint32_t, thus, for example,
1170 * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1171 * But for (64-bit) kernel, 32th bit in sa_mask is
1172 * 32th bit in 0th (64-bit) long!
1173 * For little-endian, it's the same.
1174 * For big-endian, we swap 32-bit words.
1175 */
1176 sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1177 }
1178 } else
1179 #endif
1180 {
1181 r = umove(tcp, addr, &sa);
1182 }
1183 if (r < 0) {
1184 tprints("{...}");
1185 return;
1186 }
1187 /* Architectures using function pointers, like
1188 * hppa, may need to manipulate the function pointer
1189 * to compute the result of a comparison. However,
1190 * the __sa_handler function pointer exists only in
1191 * the address space of the traced process, and can't
1192 * be manipulated by strace. In order to prevent the
1193 * compiler from generating code to manipulate
1194 * __sa_handler we cast the function pointers to long. */
1195 if ((long)sa.__sa_handler == (long)SIG_ERR)
1196 tprints("{SIG_ERR, ");
1197 else if ((long)sa.__sa_handler == (long)SIG_DFL)
1198 tprints("{SIG_DFL, ");
1199 else if ((long)sa.__sa_handler == (long)SIG_IGN)
1200 tprints("{SIG_IGN, ");
1201 else
1202 tprintf("{%#lx, ", (long) sa.__sa_handler);
1203 /*
1204 * Sigset size is in tcp->u_arg[4] (SPARC)
1205 * or in tcp->u_arg[3] (all other),
1206 * but kernel won't handle sys_rt_sigaction
1207 * with wrong sigset size (just returns EINVAL instead).
1208 * We just fetch the right size, which is NSIG / 8.
1209 */
1210 tprintsigmask_val("", sa.sa_mask);
1211 tprints(", ");
1212
1213 printflags(sigact_flags, sa.sa_flags, "SA_???");
1214 #ifdef SA_RESTORER
1215 if (sa.sa_flags & SA_RESTORER)
1216 tprintf(", %p", sa.sa_restorer);
1217 #endif
1218 tprints("}");
1219 }
1220
1221 int
sys_rt_sigaction(struct tcb * tcp)1222 sys_rt_sigaction(struct tcb *tcp)
1223 {
1224 if (entering(tcp)) {
1225 printsignal(tcp->u_arg[0]);
1226 tprints(", ");
1227 decode_new_sigaction(tcp, tcp->u_arg[1]);
1228 tprints(", ");
1229 } else {
1230 decode_new_sigaction(tcp, tcp->u_arg[2]);
1231 #if defined(SPARC) || defined(SPARC64)
1232 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
1233 #elif defined(ALPHA)
1234 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
1235 #else
1236 tprintf(", %lu", tcp->u_arg[3]);
1237 #endif
1238 }
1239 return 0;
1240 }
1241
1242 int
sys_rt_sigpending(struct tcb * tcp)1243 sys_rt_sigpending(struct tcb *tcp)
1244 {
1245 if (exiting(tcp)) {
1246 /*
1247 * One of the few syscalls where sigset size (arg[1])
1248 * is allowed to be <= NSIG / 8, not strictly ==.
1249 * This allows non-rt sigpending() syscall
1250 * to reuse rt_sigpending() code in kernel.
1251 */
1252 if (syserror(tcp))
1253 tprintf("%#lx", tcp->u_arg[0]);
1254 else
1255 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
1256 tprintf(", %lu", tcp->u_arg[1]);
1257 }
1258 return 0;
1259 }
1260
1261 int
sys_rt_sigsuspend(struct tcb * tcp)1262 sys_rt_sigsuspend(struct tcb *tcp)
1263 {
1264 if (entering(tcp)) {
1265 /* NB: kernel requires arg[1] == NSIG / 8 */
1266 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
1267 tprintf(", %lu", tcp->u_arg[1]);
1268 }
1269 return 0;
1270 }
1271
1272 static void
print_sigqueueinfo(struct tcb * tcp,int sig,unsigned long uinfo)1273 print_sigqueueinfo(struct tcb *tcp, int sig, unsigned long uinfo)
1274 {
1275 printsignal(sig);
1276 tprints(", ");
1277 printsiginfo_at(tcp, uinfo);
1278 }
1279
1280 int
sys_rt_sigqueueinfo(struct tcb * tcp)1281 sys_rt_sigqueueinfo(struct tcb *tcp)
1282 {
1283 if (entering(tcp)) {
1284 tprintf("%lu, ", tcp->u_arg[0]);
1285 print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]);
1286 }
1287 return 0;
1288 }
1289
1290 int
sys_rt_tgsigqueueinfo(struct tcb * tcp)1291 sys_rt_tgsigqueueinfo(struct tcb *tcp)
1292 {
1293 if (entering(tcp)) {
1294 tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
1295 print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]);
1296 }
1297 return 0;
1298 }
1299
sys_rt_sigtimedwait(struct tcb * tcp)1300 int sys_rt_sigtimedwait(struct tcb *tcp)
1301 {
1302 /* NB: kernel requires arg[3] == NSIG / 8 */
1303 if (entering(tcp)) {
1304 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]);
1305 tprints(", ");
1306 /* This is the only "return" parameter, */
1307 if (tcp->u_arg[1] != 0)
1308 return 0;
1309 /* ... if it's NULL, can decode all on entry */
1310 tprints("NULL, ");
1311 }
1312 else if (tcp->u_arg[1] != 0) {
1313 /* syscall exit, and u_arg[1] wasn't NULL */
1314 printsiginfo_at(tcp, tcp->u_arg[1]);
1315 tprints(", ");
1316 }
1317 else {
1318 /* syscall exit, and u_arg[1] was NULL */
1319 return 0;
1320 }
1321 print_timespec(tcp, tcp->u_arg[2]);
1322 tprintf(", %lu", tcp->u_arg[3]);
1323 return 0;
1324 };
1325
1326 int
sys_restart_syscall(struct tcb * tcp)1327 sys_restart_syscall(struct tcb *tcp)
1328 {
1329 if (entering(tcp))
1330 tprints("<... resuming interrupted call ...>");
1331 return 0;
1332 }
1333
1334 static int
do_signalfd(struct tcb * tcp,int flags_arg)1335 do_signalfd(struct tcb *tcp, int flags_arg)
1336 {
1337 /* NB: kernel requires arg[2] == NSIG / 8 */
1338 if (entering(tcp)) {
1339 printfd(tcp, tcp->u_arg[0]);
1340 tprints(", ");
1341 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[2]);
1342 tprintf(", %lu", tcp->u_arg[2]);
1343 if (flags_arg >= 0) {
1344 tprints(", ");
1345 printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
1346 }
1347 }
1348 return 0;
1349 }
1350
1351 int
sys_signalfd(struct tcb * tcp)1352 sys_signalfd(struct tcb *tcp)
1353 {
1354 return do_signalfd(tcp, -1);
1355 }
1356
1357 int
sys_signalfd4(struct tcb * tcp)1358 sys_signalfd4(struct tcb *tcp)
1359 {
1360 return do_signalfd(tcp, 3);
1361 }
1362