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>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
38 # warning NSIG is not defined, using 32
44 /* The libc headers do not define this constant since it should only be
45 used by the implementation. So we define it here. */
47 # ifdef ASM_SA_RESTORER
48 # define SA_RESTORER ASM_SA_RESTORER
53 * Some architectures define SA_RESTORER in their headers,
54 * but do not actually have sa_restorer.
56 * Some architectures, otherwise, do not define SA_RESTORER in their headers,
57 * but actually have sa_restorer.
60 # if defined HPPA || defined IA64
61 # define HAVE_SA_RESTORER 0
63 # define HAVE_SA_RESTORER 1
65 #else /* !SA_RESTORER */
66 # if defined SPARC || defined SPARC64 || defined M68K
67 # define HAVE_SA_RESTORER 1
69 # define HAVE_SA_RESTORER 0
73 #include "xlat/sa_handler_values.h"
74 #include "xlat/sigact_flags.h"
75 #include "xlat/sigprocmaskcmds.h"
77 /* Anonymous realtime signals. */
79 /* Linux kernel >= 3.18 defines SIGRTMIN to 32 on all architectures. */
80 # define ASM_SIGRTMIN 32
83 /* Under glibc 2.1, SIGRTMAX et al are functions, but __SIGRTMAX is a
84 constant. This is what we want. Otherwise, just use SIGRTMAX. */
87 # define __SIGRTMAX SIGRTMAX
91 # define ASM_SIGRTMAX __SIGRTMAX
95 /* Note on the size of sigset_t:
97 * In glibc, sigset_t is an array with space for 1024 bits (!),
98 * even though all arches supported by Linux have only 64 signals
99 * except MIPS, which has 128. IOW, it is 128 bytes long.
101 * In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long).
102 * However, some old syscall return only 32 lower bits (one word).
103 * Example: sys_sigpending vs sys_rt_sigpending.
105 * Be aware of this fact when you try to
106 * memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t))
107 * - sizeof(sigset_t) is much bigger than you think,
108 * it may overflow tcp->u_arg[] array, and it may try to copy more data
109 * than is really available in <something>.
111 * umoven(tcp, addr, sizeof(sigset_t), &sigset)
112 * may be a bad idea: it'll try to read much more data than needed
113 * to fetch a sigset_t.
114 * Use (NSIG / 8) as a size instead.
118 get_sa_handler_str(unsigned long handler)
120 return xlookup(sa_handler_values, handler);
124 print_sa_handler(unsigned long handler)
126 const char *sa_handler_str = get_sa_handler_str(handler);
129 tprints(sa_handler_str);
135 signame(const int sig)
137 static char buf[sizeof("SIGRT_%u") + sizeof(int)*3];
140 const unsigned int s = sig;
145 if (s >= ASM_SIGRTMIN && s <= (unsigned int) ASM_SIGRTMAX) {
146 sprintf(buf, "SIGRT_%u", s - ASM_SIGRTMIN);
151 sprintf(buf, "%d", sig);
156 popcount32(const uint32_t *a, unsigned int size)
158 unsigned int count = 0;
160 for (; size; ++a, --size) {
163 #ifdef HAVE___BUILTIN_POPCOUNT
164 count += __builtin_popcount(x);
175 sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes)
178 * The maximum number of signal names to be printed is NSIG * 2 / 3.
179 * Most of signal names have length 7,
180 * average length of signal names is less than 7.
181 * The length of prefix string does not exceed 16.
183 static char outstr[128 + 8 * (NSIG * 2 / 3)];
186 const uint32_t *mask;
187 uint32_t inverted_mask[NSIG / 32];
192 s = stpcpy(outstr, prefix);
195 /* length of signal mask in 4-byte words */
196 size = (bytes >= NSIG / 8) ? NSIG / 32 : (bytes + 3) / 4;
198 /* check whether 2/3 or more bits are set */
199 if (popcount32(mask, size) >= size * 32 * 2 / 3) {
200 /* show those signals that are NOT in the mask */
202 for (j = 0; j < size; ++j)
203 inverted_mask[j] = ~mask[j];
204 mask = inverted_mask;
209 for (i = 0; (i = next_set_bit(mask, i, size * 32)) >= 0; ) {
212 if ((unsigned) i < nsignals) {
213 s = stpcpy(s, signalent[i] + 3);
216 else if (i >= ASM_SIGRTMIN && i <= ASM_SIGRTMAX) {
217 s += sprintf(s, "RT_%u", i - ASM_SIGRTMIN);
221 s += sprintf(s, "%u", i);
232 #define sprintsigmask_val(prefix, mask) \
233 sprintsigmask_n((prefix), &(mask), sizeof(mask))
235 #define tprintsigmask_val(prefix, mask) \
236 tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask)))
241 tprints(signame(nr));
245 print_sigset_addr_len_limit(struct tcb *const tcp, const kernel_ureg_t addr,
246 const kernel_ureg_t len, const unsigned int min_len)
249 * Here len is usually equal to NSIG / 8 or current_wordsize.
250 * But we code this defensively:
252 if (len < min_len || len > NSIG / 8) {
256 int mask[NSIG / 8 / sizeof(int)] = {};
257 if (umoven_or_printaddr(tcp, addr, len, mask))
259 tprints(sprintsigmask_n("", mask, len));
263 print_sigset_addr_len(struct tcb *const tcp, const kernel_ureg_t addr,
264 const kernel_ureg_t len)
266 print_sigset_addr_len_limit(tcp, addr, len, current_wordsize);
272 tprintsigmask_val("", tcp->u_arg[0]);
274 else if (!syserror(tcp)) {
275 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
276 return RVAL_HEX | RVAL_STR;
281 struct old_sigaction {
282 /* sa_handler may be a libc #define, need to use other name: */
284 unsigned int sa_flags;
285 void (*__sa_handler)(int);
286 /* Kernel treats sa_mask as an array of longs. */
287 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
289 void (*__sa_handler)(int);
290 unsigned long sa_mask;
291 unsigned long sa_flags;
294 void (*sa_restorer)(void);
298 struct old_sigaction32 {
299 /* sa_handler may be a libc #define, need to use other name: */
300 uint32_t __sa_handler;
304 uint32_t sa_restorer;
309 decode_old_sigaction(struct tcb *const tcp, const kernel_ureg_t addr)
311 struct old_sigaction sa;
313 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
314 if (current_wordsize != sizeof(sa.__sa_handler) && current_wordsize == 4) {
315 struct old_sigaction32 sa32;
317 if (umove_or_printaddr(tcp, addr, &sa32))
320 memset(&sa, 0, sizeof(sa));
321 sa.__sa_handler = (void*)(uintptr_t)sa32.__sa_handler;
322 sa.sa_flags = sa32.sa_flags;
323 #if HAVE_SA_RESTORER && defined SA_RESTORER
324 sa.sa_restorer = (void*)(uintptr_t)sa32.sa_restorer;
326 sa.sa_mask = sa32.sa_mask;
329 if (umove_or_printaddr(tcp, addr, &sa))
332 /* Architectures using function pointers, like
333 * hppa, may need to manipulate the function pointer
334 * to compute the result of a comparison. However,
335 * the __sa_handler function pointer exists only in
336 * the address space of the traced process, and can't
337 * be manipulated by strace. In order to prevent the
338 * compiler from generating code to manipulate
339 * __sa_handler we cast the function pointers to long. */
340 tprints("{sa_handler=");
341 print_sa_handler((unsigned long) sa.__sa_handler);
342 tprints(", sa_mask=");
344 tprintsigmask_addr("", sa.sa_mask);
346 tprintsigmask_val("", sa.sa_mask);
348 tprints(", sa_flags=");
349 printflags(sigact_flags, sa.sa_flags, "SA_???");
350 #if HAVE_SA_RESTORER && defined SA_RESTORER
351 if (sa.sa_flags & SA_RESTORER)
352 tprintf(", sa_restorer=%p", sa.sa_restorer);
360 printsignal(tcp->u_arg[0]);
362 decode_old_sigaction(tcp, tcp->u_arg[1]);
365 decode_old_sigaction(tcp, tcp->u_arg[2]);
372 printsignal(tcp->u_arg[0]);
374 print_sa_handler(tcp->u_arg[1]);
376 } else if (!syserror(tcp)) {
377 tcp->auxstr = get_sa_handler_str(tcp->u_rval);
378 return RVAL_HEX | RVAL_STR;
386 tcp->auxstr = sprintsigmask_val("mask ", tcp->u_rval);
388 return RVAL_HEX | RVAL_STR;
393 tprintsigmask_val("", tcp->u_arg[2]);
398 /* "Old" sigprocmask, which operates with word-sized signal masks */
399 SYS_FUNC(sigprocmask)
404 * Alpha/OSF is different: it doesn't pass in two pointers,
405 * but rather passes in the new bitmask as an argument and
406 * then returns the old bitmask. This "works" because we
407 * only have 64 signals to worry about. If you want more,
408 * use of the rt_sigprocmask syscall is required.
410 * old = osf_sigprocmask(how, new);
412 * ret = sigprocmask(how, &new, &old, ...);
414 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
415 tprintsigmask_val(", ", tcp->u_arg[1]);
417 else if (!syserror(tcp)) {
418 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
419 return RVAL_HEX | RVAL_STR;
423 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
425 print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize);
429 print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize);
439 signame(tcp->u_arg[1]));
446 tprintf("%d, %d, %s",
449 signame(tcp->u_arg[2]));
457 print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize);
461 SYS_FUNC(rt_sigprocmask)
463 /* Note: arg[3] is the length of the sigset. Kernel requires NSIG / 8 */
465 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
467 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]);
471 print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]);
472 tprintf(", %lu", tcp->u_arg[3]);
477 /* Structure describing the action to be taken when a signal arrives. */
480 /* sa_handler may be a libc #define, need to use other name: */
482 unsigned int sa_flags;
483 void (*__sa_handler)(int);
485 void (*__sa_handler)(int);
486 unsigned long sa_flags;
489 void (*sa_restorer)(void);
491 /* Kernel treats sa_mask as an array of longs. */
492 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
494 /* Same for i386-on-x86_64 and similar cases */
495 struct new_sigaction32
497 uint32_t __sa_handler;
500 uint32_t sa_restorer;
502 uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
506 decode_new_sigaction(struct tcb *const tcp, const kernel_ureg_t addr)
508 struct new_sigaction sa;
510 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
511 if (current_wordsize != sizeof(sa.sa_flags) && current_wordsize == 4) {
512 struct new_sigaction32 sa32;
514 if (umove_or_printaddr(tcp, addr, &sa32))
517 memset(&sa, 0, sizeof(sa));
518 sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
519 sa.sa_flags = sa32.sa_flags;
520 #if HAVE_SA_RESTORER && defined SA_RESTORER
521 sa.sa_restorer = (void*)(unsigned long)sa32.sa_restorer;
523 /* Kernel treats sa_mask as an array of longs.
524 * For 32-bit process, "long" is uint32_t, thus, for example,
525 * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
526 * But for (64-bit) kernel, 32th bit in sa_mask is
527 * 32th bit in 0th (64-bit) long!
528 * For little-endian, it's the same.
529 * For big-endian, we swap 32-bit words.
531 sa.sa_mask[0] = ULONG_LONG(sa32.sa_mask[0], sa32.sa_mask[1]);
534 if (umove_or_printaddr(tcp, addr, &sa))
537 /* Architectures using function pointers, like
538 * hppa, may need to manipulate the function pointer
539 * to compute the result of a comparison. However,
540 * the __sa_handler function pointer exists only in
541 * the address space of the traced process, and can't
542 * be manipulated by strace. In order to prevent the
543 * compiler from generating code to manipulate
544 * __sa_handler we cast the function pointers to long. */
545 tprints("{sa_handler=");
546 print_sa_handler((unsigned long) sa.__sa_handler);
547 tprints(", sa_mask=");
549 * Sigset size is in tcp->u_arg[4] (SPARC)
550 * or in tcp->u_arg[3] (all other),
551 * but kernel won't handle sys_rt_sigaction
552 * with wrong sigset size (just returns EINVAL instead).
553 * We just fetch the right size, which is NSIG / 8.
555 tprintsigmask_val("", sa.sa_mask);
556 tprints(", sa_flags=");
558 printflags(sigact_flags, sa.sa_flags, "SA_???");
559 #if HAVE_SA_RESTORER && defined SA_RESTORER
560 if (sa.sa_flags & SA_RESTORER)
561 tprintf(", sa_restorer=%p", sa.sa_restorer);
566 SYS_FUNC(rt_sigaction)
569 printsignal(tcp->u_arg[0]);
571 decode_new_sigaction(tcp, tcp->u_arg[1]);
574 decode_new_sigaction(tcp, tcp->u_arg[2]);
575 #if defined(SPARC) || defined(SPARC64)
576 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
578 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
580 tprintf(", %lu", tcp->u_arg[3]);
586 SYS_FUNC(rt_sigpending)
590 * One of the few syscalls where sigset size (arg[1])
591 * is allowed to be <= NSIG / 8, not strictly ==.
592 * This allows non-rt sigpending() syscall
593 * to reuse rt_sigpending() code in kernel.
595 print_sigset_addr_len_limit(tcp, tcp->u_arg[0],
597 tprintf(", %lu", tcp->u_arg[1]);
602 SYS_FUNC(rt_sigsuspend)
604 /* NB: kernel requires arg[1] == NSIG / 8 */
605 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
606 tprintf(", %lu", tcp->u_arg[1]);
612 print_sigqueueinfo(struct tcb *const tcp, const int sig,
613 const kernel_ureg_t addr)
617 printsiginfo_at(tcp, addr);
620 SYS_FUNC(rt_sigqueueinfo)
622 tprintf("%d, ", (int) tcp->u_arg[0]);
623 print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]);
628 SYS_FUNC(rt_tgsigqueueinfo)
630 tprintf("%d, %d, ", (int) tcp->u_arg[0], (int) tcp->u_arg[1]);
631 print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]);
636 SYS_FUNC(rt_sigtimedwait)
638 /* NB: kernel requires arg[3] == NSIG / 8 */
640 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]);
642 if (!(tcp->u_arg[1] && verbose(tcp))) {
644 * This is the only "return" parameter,
645 * if we are not going to fetch it on exit,
646 * decode all parameters on entry.
648 printaddr(tcp->u_arg[1]);
650 print_timespec(tcp, tcp->u_arg[2]);
651 tprintf(", %lu", tcp->u_arg[3]);
653 char *sts = xstrdup(sprint_timespec(tcp, tcp->u_arg[2]));
654 set_tcb_priv_data(tcp, sts, free);
657 if (tcp->u_arg[1] && verbose(tcp)) {
658 printsiginfo_at(tcp, tcp->u_arg[1]);
660 tprints(get_tcb_priv_data(tcp));
661 tprintf(", %lu", tcp->u_arg[3]);
664 if (!syserror(tcp) && tcp->u_rval) {
665 tcp->auxstr = signame(tcp->u_rval);
672 SYS_FUNC(restart_syscall)
674 tprintf("<... resuming interrupted %s ...>",
675 tcp->s_prev_ent ? tcp->s_prev_ent->sys_name : "system call");