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.
35 #include "native_defs.h"
36 #include <sys/param.h>
39 /* for struct iovec */
46 # undef PTRACE_GETREGS
47 # define PTRACE_GETREGS PTRACE_GETREGS64
48 # undef PTRACE_SETREGS
49 # define PTRACE_SETREGS PTRACE_SETREGS64
53 # include <asm/psrcompat.h>
63 # define NT_PRSTATUS 1
67 # warning: NSIG is not defined, using 32
73 /* Define these shorthand notations to simplify the syscallent files. */
77 #define TN TRACE_NETWORK
78 #define TP TRACE_PROCESS
79 #define TS TRACE_SIGNAL
80 #define TM TRACE_MEMORY
81 #define NF SYSCALL_NEVER_FAILS
83 #define SI STACKTRACE_INVALIDATE_CACHE
84 #define SE STACKTRACE_CAPTURE_ON_ENTER
86 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
88 const struct_sysent sysent0[] = {
89 #include "syscallent.h"
92 #if SUPPORTED_PERSONALITIES > 1
93 # include PERSONALITY1_INCLUDE_FUNCS
94 static const struct_sysent sysent1[] = {
95 # include "syscallent1.h"
99 #if SUPPORTED_PERSONALITIES > 2
100 # include PERSONALITY2_INCLUDE_FUNCS
101 static const struct_sysent sysent2[] = {
102 # include "syscallent2.h"
106 /* Now undef them since short defines cause wicked namespace pollution. */
121 * `ioctlent[012].h' files are automatically generated by the auxiliary
122 * program `ioctlsort', such that the list is sorted by the `code' field.
123 * This has the side-effect of resolving the _IO.. macros into
124 * plain integers, eliminating the need to include here everything
128 const char *const errnoent0[] = {
129 #include "errnoent.h"
131 const char *const signalent0[] = {
132 #include "signalent.h"
134 const struct_ioctlent ioctlent0[] = {
135 #include "ioctlent0.h"
138 #if SUPPORTED_PERSONALITIES > 1
139 static const char *const errnoent1[] = {
140 # include "errnoent1.h"
142 static const char *const signalent1[] = {
143 # include "signalent1.h"
145 static const struct_ioctlent ioctlent1[] = {
146 # include "ioctlent1.h"
148 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
149 static const struct_printers printers0 = {
150 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
152 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
153 static const struct_printers printers1 = {
154 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
158 #if SUPPORTED_PERSONALITIES > 2
159 static const char *const errnoent2[] = {
160 # include "errnoent2.h"
162 static const char *const signalent2[] = {
163 # include "signalent2.h"
165 static const struct_ioctlent ioctlent2[] = {
166 # include "ioctlent2.h"
168 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
169 static const struct_printers printers2 = {
170 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
175 nsyscalls0 = ARRAY_SIZE(sysent0)
176 #if SUPPORTED_PERSONALITIES > 1
177 , nsyscalls1 = ARRAY_SIZE(sysent1)
178 # if SUPPORTED_PERSONALITIES > 2
179 , nsyscalls2 = ARRAY_SIZE(sysent2)
185 nerrnos0 = ARRAY_SIZE(errnoent0)
186 #if SUPPORTED_PERSONALITIES > 1
187 , nerrnos1 = ARRAY_SIZE(errnoent1)
188 # if SUPPORTED_PERSONALITIES > 2
189 , nerrnos2 = ARRAY_SIZE(errnoent2)
195 nsignals0 = ARRAY_SIZE(signalent0)
196 #if SUPPORTED_PERSONALITIES > 1
197 , nsignals1 = ARRAY_SIZE(signalent1)
198 # if SUPPORTED_PERSONALITIES > 2
199 , nsignals2 = ARRAY_SIZE(signalent2)
205 nioctlents0 = ARRAY_SIZE(ioctlent0)
206 #if SUPPORTED_PERSONALITIES > 1
207 , nioctlents1 = ARRAY_SIZE(ioctlent1)
208 # if SUPPORTED_PERSONALITIES > 2
209 , nioctlents2 = ARRAY_SIZE(ioctlent2)
214 #if SUPPORTED_PERSONALITIES > 1
215 const struct_sysent *sysent = sysent0;
216 const char *const *errnoent = errnoent0;
217 const char *const *signalent = signalent0;
218 const struct_ioctlent *ioctlent = ioctlent0;
219 const struct_printers *printers = &printers0;
222 unsigned nsyscalls = nsyscalls0;
223 unsigned nerrnos = nerrnos0;
224 unsigned nsignals = nsignals0;
225 unsigned nioctlents = nioctlents0;
228 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
230 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
232 #if SUPPORTED_PERSONALITIES > 1
235 #if SUPPORTED_PERSONALITIES > 2
239 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
241 #if SUPPORTED_PERSONALITIES > 1
244 #if SUPPORTED_PERSONALITIES > 2
250 MAX_NSYSCALLS1 = (nsyscalls0
251 #if SUPPORTED_PERSONALITIES > 1
252 > nsyscalls1 ? nsyscalls0 : nsyscalls1
255 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
256 #if SUPPORTED_PERSONALITIES > 2
257 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
260 MAX_NSYSCALLS = MAX_NSYSCALLS2,
261 /* We are ready for arches with up to 255 signals,
262 * even though the largest known signo is on MIPS and it is 128.
263 * The number of existing syscalls on all arches is
264 * larger that 255 anyway, so it is just a pedantic matter.
266 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
269 #if SUPPORTED_PERSONALITIES > 1
270 unsigned current_personality;
272 # ifndef current_wordsize
273 unsigned current_wordsize;
274 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
275 PERSONALITY0_WORDSIZE,
276 PERSONALITY1_WORDSIZE,
277 # if SUPPORTED_PERSONALITIES > 2
278 PERSONALITY2_WORDSIZE,
284 set_personality(int personality)
286 nsyscalls = nsyscall_vec[personality];
287 sysent = sysent_vec[personality];
289 switch (personality) {
291 errnoent = errnoent0;
293 ioctlent = ioctlent0;
294 nioctlents = nioctlents0;
295 signalent = signalent0;
296 nsignals = nsignals0;
297 printers = &printers0;
301 errnoent = errnoent1;
303 ioctlent = ioctlent1;
304 nioctlents = nioctlents1;
305 signalent = signalent1;
306 nsignals = nsignals1;
307 printers = &printers1;
310 # if SUPPORTED_PERSONALITIES > 2
312 errnoent = errnoent2;
314 ioctlent = ioctlent2;
315 nioctlents = nioctlents2;
316 signalent = signalent2;
317 nsignals = nsignals2;
318 printers = &printers2;
323 current_personality = personality;
324 # ifndef current_wordsize
325 current_wordsize = personality_wordsize[personality];
330 update_personality(struct tcb *tcp, unsigned int personality)
332 if (personality == current_personality)
334 set_personality(personality);
336 if (personality == tcp->currpers)
338 tcp->currpers = personality;
340 # undef PERSONALITY_NAMES
341 # if defined POWERPC64
342 # define PERSONALITY_NAMES {"64 bit", "32 bit"}
343 # elif defined X86_64
344 # define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
346 # define PERSONALITY_NAMES {"x32", "32 bit"}
347 # elif defined AARCH64
348 # define PERSONALITY_NAMES {"64 bit", "32 bit"}
350 # define PERSONALITY_NAMES {"64-bit", "32-bit"}
352 # ifdef PERSONALITY_NAMES
354 static const char *const names[] = PERSONALITY_NAMES;
355 error_msg("[ Process PID=%d runs in %s mode. ]",
356 tcp->pid, names[personality]);
362 static int qual_desc(const char *, unsigned int, int);
363 static int qual_fault(const char *, unsigned int, int);
364 static int qual_signal(const char *, unsigned int, int);
365 static int qual_syscall(const char *, unsigned int, int);
367 static const struct qual_options {
368 unsigned int bitflag;
369 const char *option_name;
370 int (*qualify)(const char *, unsigned int, int);
371 const char *argument_name;
373 { QUAL_TRACE, "trace", qual_syscall, "system call" },
374 { QUAL_TRACE, "t", qual_syscall, "system call" },
375 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" },
376 { QUAL_ABBREV, "a", qual_syscall, "system call" },
377 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" },
378 { QUAL_VERBOSE, "v", qual_syscall, "system call" },
379 { QUAL_RAW, "raw", qual_syscall, "system call" },
380 { QUAL_RAW, "x", qual_syscall, "system call" },
381 { QUAL_SIGNAL, "signal", qual_signal, "signal" },
382 { QUAL_SIGNAL, "signals", qual_signal, "signal" },
383 { QUAL_SIGNAL, "s", qual_signal, "signal" },
384 { QUAL_READ, "read", qual_desc, "descriptor" },
385 { QUAL_READ, "reads", qual_desc, "descriptor" },
386 { QUAL_READ, "r", qual_desc, "descriptor" },
387 { QUAL_WRITE, "write", qual_desc, "descriptor" },
388 { QUAL_WRITE, "writes", qual_desc, "descriptor" },
389 { QUAL_WRITE, "w", qual_desc, "descriptor" },
390 { QUAL_FAULT, "fault", qual_fault, "fault argument"},
391 { 0, NULL, NULL, NULL },
395 reallocate_vec(void **vec, unsigned int old_nmemb,
396 size_t size, unsigned int new_nmemb)
400 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
401 vec[p] = xreallocarray(vec[p], new_nmemb, size);
402 memset(vec[p] + size * old_nmemb, 0,
403 (new_nmemb - old_nmemb) * size);
408 reallocate_qual(const unsigned int n)
410 reallocate_vec((void **) qual_vec, num_quals, sizeof(qualbits_t), n);
420 static unsigned int num_faults;
421 static struct fault_opts *fault_vec[SUPPORTED_PERSONALITIES];
424 reallocate_fault(const unsigned int n)
426 reallocate_vec((void **) fault_vec, num_faults,
427 sizeof(struct fault_opts), n);
432 qualify_one(const unsigned int n, unsigned int bitflag, const int not,
433 const int pers, const struct fault_opts *fopts)
437 if (num_quals <= n) {
438 reallocate_qual(n + 1);
439 reallocate_fault(n + 1);
442 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
443 if (pers == p || pers < 0) {
445 qual_vec[p][n] &= ~bitflag;
447 qual_vec[p][n] |= bitflag;
449 memcpy(&fault_vec[p][n], fopts,
457 qualify_scno(const char *const s, const unsigned int bitflag,
458 const int not, const struct fault_opts *const fopts)
460 int i = string_to_uint_upto(s, MAX_NSYSCALLS - 1);
464 qualify_one(i, bitflag, not, -1, fopts);
469 lookup_class(const char *s)
471 if (strcmp(s, "all") == 0)
473 if (strcmp(s, "file") == 0)
475 if (strcmp(s, "ipc") == 0)
477 if (strcmp(s, "network") == 0)
478 return TRACE_NETWORK;
479 if (strcmp(s, "process") == 0)
480 return TRACE_PROCESS;
481 if (strcmp(s, "signal") == 0)
483 if (strcmp(s, "desc") == 0)
485 if (strcmp(s, "memory") == 0)
491 qualify_syscall_class(const char *const s, const unsigned int bitflag,
492 const int not, const struct fault_opts *const fopts)
495 const int n = lookup_class(s);
500 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
503 for (i = 0; i < nsyscall_vec[p]; ++i) {
504 if (sysent_vec[p][i].sys_name
505 && (sysent_vec[p][i].sys_flags & n) == n) {
506 qualify_one(i, bitflag, not, p, fopts);
515 qualify_syscall_name(const char *const s, const unsigned int bitflag,
516 const int not, const struct fault_opts *const fopts)
521 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
524 for (i = 0; i < nsyscall_vec[p]; ++i) {
525 if (sysent_vec[p][i].sys_name
526 && strcmp(s, sysent_vec[p][i].sys_name) == 0) {
527 qualify_one(i, bitflag, not, p, fopts);
537 qual_syscall_ex(const char *const s, const unsigned int bitflag,
538 const int not, const struct fault_opts *const fopts)
540 if (qualify_scno(s, bitflag, not, fopts)
541 || qualify_syscall_class(s, bitflag, not, fopts)
542 || qualify_syscall_name(s, bitflag, not, fopts)) {
550 qual_syscall(const char *const s, const unsigned int bitflag, const int not)
552 return qual_syscall_ex(s, bitflag, not, NULL);
556 * Returns NULL if STR does not start with PREFIX,
557 * or a pointer to the first char in STR after PREFIX.
560 strip_prefix(const char *prefix, const char *str)
562 size_t len = strlen(prefix);
564 return (len > strlen(str) || memcmp(prefix, str, len))
569 find_errno_by_name(const char *name)
573 for (i = 1; i < nerrnos; ++i) {
574 if (errnoent[i] && (strcmp(name, errnoent[i]) == 0))
582 parse_fault_token(const char *const token, struct fault_opts *const fopts)
587 if ((val = strip_prefix("when=", token))) {
595 intval = string_to_uint_ex(val, &end, 0xffff, "+");
599 fopts->first = intval;
605 intval = string_to_uint_upto(val, 0xffff);
608 fopts->step = intval;
617 } else if ((val = strip_prefix("error=", token))) {
618 intval = string_to_uint_upto(val, 4095);
620 intval = find_errno_by_name(val);
632 parse_fault_expression(const char *const s, char **buf,
633 struct fault_opts *const fopts)
637 char *saveptr = NULL;
640 name = strtok_r(*buf, ":", &saveptr);
644 while ((token = strtok_r(NULL, ":", &saveptr))) {
645 if (!parse_fault_token(token, fopts))
657 qual_fault(const char *const s, const unsigned int bitflag, const int not)
659 struct fault_opts opts = {
666 const char *name = parse_fault_expression(s, &buf, &opts);
671 int rc = qual_syscall_ex(name, bitflag, not, &opts);
678 qual_signal(const char *s, const unsigned int bitflag, const int not)
682 if (*s >= '0' && *s <= '9') {
683 int signo = string_to_uint_upto(s, 255);
686 qualify_one(signo, bitflag, not, -1, NULL);
689 if (strncasecmp(s, "SIG", 3) == 0)
691 for (i = 0; i <= NSIG; i++) {
692 if (strcasecmp(s, signame(i) + 3) == 0) {
693 qualify_one(i, bitflag, not, -1, NULL);
701 qual_desc(const char *s, const unsigned int bitflag, const int not)
703 int desc = string_to_uint_upto(s, 0x7fff);
706 qualify_one(desc, bitflag, not, -1, NULL);
711 qualify(const char *s)
713 const struct qual_options *opt;
719 if (num_quals == 0) {
720 reallocate_qual(MIN_QUALS);
721 reallocate_fault(MIN_QUALS);
724 opt = &qual_options[0];
725 for (i = 0; (p = qual_options[i].option_name); i++) {
726 unsigned int len = strlen(p);
727 if (strncmp(s, p, len) == 0 && s[len] == '=') {
728 opt = &qual_options[i];
738 if (strcmp(s, "none") == 0) {
742 if (opt->bitflag != QUAL_FAULT && strcmp(s, "all") == 0) {
743 for (i = 0; i < num_quals; i++) {
744 qualify_one(i, opt->bitflag, not, -1, NULL);
748 for (i = 0; i < num_quals; i++) {
749 qualify_one(i, opt->bitflag, !not, -1, NULL);
752 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
753 if (opt->qualify(p, opt->bitflag, not)) {
754 error_msg_and_die("invalid %s '%s'",
755 opt->argument_name, p);
762 #ifdef SYS_socket_subcall
764 decode_socket_subcall(struct tcb *tcp)
766 const int call = tcp->u_arg[0];
768 if (call < 1 || call >= SYS_socket_nsubcalls)
771 const unsigned long scno = SYS_socket_subcall + call;
772 const unsigned int nargs = sysent[scno].nargs;
775 if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
779 tcp->qual_flg = qual_flags[scno];
780 tcp->s_ent = &sysent[scno];
783 for (i = 0; i < nargs; ++i)
784 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
785 ? ((uint32_t *) (void *) buf)[i] : buf[i];
789 #ifdef SYS_ipc_subcall
791 decode_ipc_subcall(struct tcb *tcp)
793 unsigned int call = tcp->u_arg[0];
794 const unsigned int version = call >> 16;
797 # if defined S390 || defined S390X
801 if (current_wordsize == 8)
804 set_tcb_priv_ulong(tcp, version);
810 case 1: case 2: case 3: case 4:
811 case 11: case 12: case 13: case 14:
812 case 21: case 22: case 23: case 24:
818 tcp->scno = SYS_ipc_subcall + call;
819 tcp->qual_flg = qual_flags[tcp->scno];
820 tcp->s_ent = &sysent[tcp->scno];
822 const unsigned int n = tcp->s_ent->nargs;
824 for (i = 0; i < n; i++)
825 tcp->u_arg[i] = tcp->u_arg[i + 1];
831 decode_mips_subcall(struct tcb *tcp)
833 if (!SCNO_IS_VALID(tcp->u_arg[0]))
835 tcp->scno = tcp->u_arg[0];
836 tcp->qual_flg = qual_flags[tcp->scno];
837 tcp->s_ent = &sysent[tcp->scno];
838 memmove(&tcp->u_arg[0], &tcp->u_arg[1],
839 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
841 * Fetching the last arg of 7-arg syscalls (fadvise64_64
842 * and sync_file_range) requires additional code,
843 * see linux/mips/get_syscall_args.c
845 if (tcp->s_ent->nargs == MAX_ARGS) {
847 mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
848 sizeof(tcp->u_arg[0]),
849 &tcp->u_arg[MAX_ARGS - 1]) < 0)
850 tcp->u_arg[MAX_ARGS - 1] = 0;
853 #endif /* LINUX_MIPSO32 */
856 dumpio(struct tcb *tcp)
862 if ((unsigned long) tcp->u_arg[0] >= num_quals)
864 sen = tcp->s_ent->sen;
865 if (SEN_printargs == sen)
867 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
873 case SEN_mq_timedreceive:
874 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
879 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
883 dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
886 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
890 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
896 case SEN_mq_timedsend:
897 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
903 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
906 dumpiov_in_msghdr(tcp, tcp->u_arg[1],
907 (unsigned long) -1L);
910 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
917 * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
918 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
920 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
922 shuffle_scno(unsigned long scno)
924 if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
927 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
928 if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
930 if (scno == 0x000ffff0)
931 return ARM_FIRST_SHUFFLED_SYSCALL;
933 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
935 * Is it ARM specific syscall?
936 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
937 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
939 if (scno >= 0x000f0000 &&
940 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
941 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
943 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
944 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
950 # define shuffle_scno(scno) ((long)(scno))
954 syscall_name(long scno)
956 static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
958 if (SCNO_IS_VALID(scno))
959 return sysent[scno].sys_name;
961 sprintf(buf, "syscall_%lu", scno);
967 err_name(unsigned long err)
969 if ((err < nerrnos) && errnoent[err])
970 return errnoent[err];
975 static long get_regs_error;
983 static int get_syscall_args(struct tcb *);
984 static int get_syscall_result(struct tcb *);
985 static int arch_get_scno(struct tcb *tcp);
986 static int arch_set_scno(struct tcb *, long);
987 static void get_error(struct tcb *, const bool);
988 static int arch_set_error(struct tcb *);
990 static struct fault_opts *
991 tcb_fault_opts(struct tcb *tcp)
993 return (SCNO_IN_RANGE(tcp->scno) && tcp->fault_vec[current_personality])
994 ? &tcp->fault_vec[current_personality][tcp->scno] : NULL;
999 inject_syscall_fault_entering(struct tcb *tcp)
1001 if (!tcp->fault_vec[current_personality]) {
1002 tcp->fault_vec[current_personality] =
1003 xreallocarray(NULL, num_faults,
1004 sizeof(struct fault_opts));
1005 memcpy(tcp->fault_vec[current_personality],
1006 fault_vec[current_personality],
1007 num_faults * sizeof(struct fault_opts));
1010 struct fault_opts *opts = tcb_fault_opts(tcp);
1012 if (opts->first == 0)
1017 if (opts->first != 0)
1020 opts->first = opts->step;
1022 if (!arch_set_scno(tcp, -1))
1023 tcp->flags |= TCB_FAULT_INJ;
1029 update_syscall_fault_exiting(struct tcb *tcp)
1031 struct fault_opts *opts = tcb_fault_opts(tcp);
1033 if (opts && opts->err && tcp->u_error != opts->err) {
1034 unsigned long u_error = tcp->u_error;
1035 tcp->u_error = opts->err;
1036 if (arch_set_error(tcp))
1037 tcp->u_error = u_error;
1044 trace_syscall_entering(struct tcb *tcp)
1048 scno_good = res = get_scno(tcp);
1052 res = get_syscall_args(tcp);
1056 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
1058 * " <unavailable>" will be added later by the code which
1059 * detects ptrace errors.
1064 #ifdef LINUX_MIPSO32
1065 if (SEN_syscall == tcp->s_ent->sen)
1066 decode_mips_subcall(tcp);
1069 if ( SEN_execve == tcp->s_ent->sen
1070 # if defined(SPARC) || defined(SPARC64)
1071 || SEN_execv == tcp->s_ent->sen
1074 hide_log_until_execve = 0;
1077 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
1078 switch (tcp->s_ent->sen) {
1079 # ifdef SYS_socket_subcall
1080 case SEN_socketcall:
1081 decode_socket_subcall(tcp);
1084 # ifdef SYS_ipc_subcall
1086 decode_ipc_subcall(tcp);
1092 if (!(tcp->qual_flg & QUAL_TRACE)
1093 || (tracing_paths && !pathtrace_match(tcp))
1095 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
1096 tcp->sys_func_rval = 0;
1100 tcp->flags &= ~TCB_FILTERED;
1102 if (hide_log_until_execve) {
1107 if (tcp->qual_flg & QUAL_FAULT)
1108 inject_syscall_fault_entering(tcp);
1110 if (cflag == CFLAG_ONLY_STATS) {
1115 #ifdef USE_LIBUNWIND
1116 if (stack_trace_enabled) {
1117 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
1118 unwind_capture_stacktrace(tcp);
1123 tprintf("%s(", tcp->s_ent->sys_name);
1124 if ((tcp->qual_flg & QUAL_RAW) && SEN_exit != tcp->s_ent->sen)
1125 res = printargs(tcp);
1127 res = tcp->s_ent->sys_func(tcp);
1131 tcp->flags |= TCB_INSYSCALL;
1132 tcp->sys_func_rval = res;
1133 /* Measure the entrance time as late as possible to avoid errors. */
1135 gettimeofday(&tcp->etime, NULL);
1140 syscall_fault_injected(struct tcb *tcp)
1142 return tcp->flags & TCB_FAULT_INJ;
1146 trace_syscall_exiting(struct tcb *tcp)
1151 unsigned long u_error;
1152 const char *u_error_str;
1154 /* Measure the exit time as early as possible to avoid errors. */
1156 gettimeofday(&tv, NULL);
1158 #ifdef USE_LIBUNWIND
1159 if (stack_trace_enabled) {
1160 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
1161 unwind_cache_invalidate(tcp);
1165 #if SUPPORTED_PERSONALITIES > 1
1166 update_personality(tcp, tcp->currpers);
1168 res = (get_regs_error ? -1 : get_syscall_result(tcp));
1169 if (filtered(tcp) || hide_log_until_execve)
1172 if (syserror(tcp) && syscall_fault_injected(tcp))
1173 update_syscall_fault_exiting(tcp);
1176 count_syscall(tcp, &tv);
1177 if (cflag == CFLAG_ONLY_STATS) {
1182 /* If not in -ff mode, and printing_tcp != tcp,
1183 * then the log currently does not end with output
1184 * of _our syscall entry_, but with something else.
1185 * We need to say which syscall's return is this.
1187 * Forced reprinting via TCB_REPRINT is used only by
1188 * "strace -ff -oLOG test/threaded_execve" corner case.
1189 * It's the only case when -ff mode needs reprinting.
1191 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
1192 tcp->flags &= ~TCB_REPRINT;
1194 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
1198 tcp->s_prev_ent = NULL;
1200 /* There was error in one of prior ptrace ops */
1203 tprints("= ? <unavailable>\n");
1205 tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
1206 tcp->sys_func_rval = 0;
1207 free_tcb_priv_data(tcp);
1210 tcp->s_prev_ent = tcp->s_ent;
1213 if (tcp->qual_flg & QUAL_RAW) {
1214 /* sys_res = printargs(tcp); - but it's nop on sysexit */
1216 /* FIXME: not_failing_only (IOW, option -z) is broken:
1217 * failure of syscall is known only after syscall return.
1218 * Thus we end up with something like this on, say, ENOENT:
1219 * open("doesnt_exist", O_RDONLY <unfinished ...>
1220 * {next syscall decode}
1221 * whereas the intended result is that open(...) line
1222 * is not shown at all.
1224 if (not_failing_only && tcp->u_error)
1225 goto ret; /* ignore failed syscalls */
1226 if (tcp->sys_func_rval & RVAL_DECODED)
1227 sys_res = tcp->sys_func_rval;
1229 sys_res = tcp->s_ent->sys_func(tcp);
1234 u_error = tcp->u_error;
1236 if (tcp->qual_flg & QUAL_RAW) {
1238 tprintf("= -1 (errno %lu)", u_error);
1239 if (syscall_fault_injected(tcp))
1240 tprints(" (INJECTED)");
1242 tprintf("= %#lx", tcp->u_rval);
1245 else if (!(sys_res & RVAL_NONE) && u_error) {
1247 /* Blocked signals do not interrupt any syscalls.
1248 * In this case syscalls don't return ERESTARTfoo codes.
1250 * Deadly signals set to SIG_DFL interrupt syscalls
1251 * and kill the process regardless of which of the codes below
1252 * is returned by the interrupted syscall.
1253 * In some cases, kernel forces a kernel-generated deadly
1254 * signal to be unblocked and set to SIG_DFL (and thus cause
1255 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
1256 * or SIGILL. (The alternative is to leave process spinning
1257 * forever on the faulty instruction - not useful).
1259 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
1260 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
1261 * but kernel will always restart them.
1264 /* Most common type of signal-interrupted syscall exit code.
1265 * The system call will be restarted with the same arguments
1266 * if SA_RESTART is set; otherwise, it will fail with EINTR.
1268 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
1270 case ERESTARTNOINTR:
1271 /* Rare. For example, fork() returns this if interrupted.
1272 * SA_RESTART is ignored (assumed set): the restart is unconditional.
1274 tprints("= ? ERESTARTNOINTR (To be restarted)");
1276 case ERESTARTNOHAND:
1277 /* pause(), rt_sigsuspend() etc use this code.
1278 * SA_RESTART is ignored (assumed not set):
1279 * syscall won't restart (will return EINTR instead)
1280 * even after signal with SA_RESTART set. However,
1281 * after SIG_IGN or SIG_DFL signal it will restart
1282 * (thus the name "restart only if has no handler").
1284 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
1286 case ERESTART_RESTARTBLOCK:
1287 /* Syscalls like nanosleep(), poll() which can't be
1288 * restarted with their original arguments use this
1289 * code. Kernel will execute restart_syscall() instead,
1290 * which changes arguments before restarting syscall.
1291 * SA_RESTART is ignored (assumed not set) similarly
1292 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1293 * since restart data is saved in "restart block"
1294 * in task struct, and if signal handler uses a syscall
1295 * which in turn saves another such restart block,
1296 * old data is lost and restart becomes impossible)
1298 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1301 u_error_str = err_name(u_error);
1303 tprintf("= -1 %s (%s)",
1304 u_error_str, strerror(u_error));
1306 tprintf("= -1 %lu (%s)",
1307 u_error, strerror(u_error));
1310 if (syscall_fault_injected(tcp))
1311 tprintf(" (INJECTED)");
1312 if ((sys_res & RVAL_STR) && tcp->auxstr)
1313 tprintf(" (%s)", tcp->auxstr);
1316 if (sys_res & RVAL_NONE)
1319 switch (sys_res & RVAL_MASK) {
1321 #if SUPPORTED_PERSONALITIES > 1
1322 if (current_wordsize < sizeof(long))
1324 (unsigned int) tcp->u_rval);
1327 tprintf("= %#lx", tcp->u_rval);
1331 print_numeric_long_umask(tcp->u_rval);
1334 #if SUPPORTED_PERSONALITIES > 1
1335 if (current_wordsize < sizeof(long))
1337 (unsigned int) tcp->u_rval);
1340 tprintf("= %lu", tcp->u_rval);
1343 tprintf("= %ld", tcp->u_rval);
1348 printfd(tcp, tcp->u_rval);
1351 tprintf("= %ld", tcp->u_rval);
1353 #if HAVE_STRUCT_TCB_EXT_ARG
1356 tprintf("= %#llx", tcp->u_lrval);
1359 tprintf("= %#llo", tcp->u_lrval);
1362 case RVAL_LUDECIMAL:
1363 tprintf("= %llu", tcp->u_lrval);
1367 tprintf("= %lld", tcp->u_lrval);
1370 #endif /* HAVE_STRUCT_TCB_EXT_ARG */
1372 error_msg("invalid rval format");
1376 if ((sys_res & RVAL_STR) && tcp->auxstr)
1377 tprintf(" (%s)", tcp->auxstr);
1380 tv_sub(&tv, &tv, &tcp->etime);
1381 tprintf(" <%ld.%06ld>",
1382 (long) tv.tv_sec, (long) tv.tv_usec);
1388 #ifdef USE_LIBUNWIND
1389 if (stack_trace_enabled)
1390 unwind_print_stacktrace(tcp);
1394 tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
1395 tcp->sys_func_rval = 0;
1396 free_tcb_priv_data(tcp);
1401 trace_syscall(struct tcb *tcp)
1403 return exiting(tcp) ?
1404 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1408 is_erestart(struct tcb *tcp)
1410 switch (tcp->u_error) {
1412 case ERESTARTNOINTR:
1413 case ERESTARTNOHAND:
1414 case ERESTART_RESTARTBLOCK:
1421 static unsigned long saved_u_error;
1424 temporarily_clear_syserror(struct tcb *tcp)
1426 saved_u_error = tcp->u_error;
1431 restore_cleared_syserror(struct tcb *tcp)
1433 tcp->u_error = saved_u_error;
1436 #include "kernel_types.h"
1439 * Check the syscall return value register value for whether it is
1440 * a negated errno code indicating an error, or a success return value.
1443 is_negated_errno(kernel_ulong_t val)
1445 /* Linux kernel defines MAX_ERRNO to 4095. */
1446 kernel_ulong_t max = -(kernel_long_t) 4095;
1448 #if defined X86_64 || defined X32
1450 * current_wordsize is 4 for x32 personality
1451 * but truncation _must not_ be done in it, so
1452 * check current_personality instead.
1454 if (current_personality == 1) {
1455 val = (uint32_t) val;
1456 max = (uint32_t) max;
1458 #elif SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1459 if (current_wordsize < sizeof(val)) {
1460 val = (uint32_t) val;
1461 max = (uint32_t) max;
1468 #include "arch_regs.c"
1470 #ifdef HAVE_GETRVAL2
1471 # include "arch_getrval2.c"
1475 print_pc(struct tcb *tcp)
1477 #if defined ARCH_PC_REG
1478 # define ARCH_GET_PC 0
1479 #elif defined ARCH_PC_PEEK_ADDR
1481 # define ARCH_PC_REG pc
1482 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1484 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1486 if (get_regs_error || ARCH_GET_PC)
1487 tprints(current_wordsize == 4 ? "[????????] "
1488 : "[????????????????] ");
1490 tprintf(current_wordsize == 4 ? "[%08lx] " : "[%016lx] ",
1491 (unsigned long) ARCH_PC_REG);
1494 #include "getregs_old.h"
1496 #undef ptrace_getregset_or_getregs
1497 #undef ptrace_setregset_or_setregs
1498 #ifdef ARCH_REGS_FOR_GETREGSET
1500 # define ptrace_getregset_or_getregs ptrace_getregset
1502 ptrace_getregset(pid_t pid)
1504 # ifdef ARCH_IOVEC_FOR_GETREGSET
1505 /* variable iovec */
1506 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1507 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1508 &ARCH_IOVEC_FOR_GETREGSET);
1510 /* constant iovec */
1511 static struct iovec io = {
1512 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1513 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1515 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1520 # ifndef HAVE_GETREGS_OLD
1521 # define ptrace_setregset_or_setregs ptrace_setregset
1523 ptrace_setregset(pid_t pid)
1525 # ifdef ARCH_IOVEC_FOR_GETREGSET
1526 /* variable iovec */
1527 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1528 &ARCH_IOVEC_FOR_GETREGSET);
1530 /* constant iovec */
1531 static struct iovec io = {
1532 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1533 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1535 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1538 # endif /* !HAVE_GETREGS_OLD */
1540 #elif defined ARCH_REGS_FOR_GETREGS
1542 # define ptrace_getregset_or_getregs ptrace_getregs
1544 ptrace_getregs(pid_t pid)
1546 # if defined SPARC || defined SPARC64
1547 /* SPARC systems have the meaning of data and addr reversed */
1548 return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1550 return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1554 # ifndef HAVE_GETREGS_OLD
1555 # define ptrace_setregset_or_setregs ptrace_setregs
1557 ptrace_setregs(pid_t pid)
1559 # if defined SPARC || defined SPARC64
1560 /* SPARC systems have the meaning of data and addr reversed */
1561 return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1563 return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1566 # endif /* !HAVE_GETREGS_OLD */
1568 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1573 #undef USE_GET_SYSCALL_RESULT_REGS
1574 #ifdef ptrace_getregset_or_getregs
1576 # ifdef HAVE_GETREGS_OLD
1578 * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1579 * fallback to getregs_old.
1581 static int use_getregs_old;
1582 if (use_getregs_old < 0) {
1583 get_regs_error = ptrace_getregset_or_getregs(pid);
1585 } else if (use_getregs_old == 0) {
1586 get_regs_error = ptrace_getregset_or_getregs(pid);
1587 if (get_regs_error >= 0) {
1588 use_getregs_old = -1;
1591 if (errno == EPERM || errno == ESRCH)
1593 use_getregs_old = 1;
1595 get_regs_error = getregs_old(pid);
1596 # else /* !HAVE_GETREGS_OLD */
1597 /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1598 get_regs_error = ptrace_getregset_or_getregs(pid);
1599 # endif /* !HAVE_GETREGS_OLD */
1601 #else /* !ptrace_getregset_or_getregs */
1603 # define USE_GET_SYSCALL_RESULT_REGS 1
1604 # warning get_regs is not implemented for this architecture yet
1607 #endif /* !ptrace_getregset_or_getregs */
1610 #ifdef ptrace_setregset_or_setregs
1614 return ptrace_setregset_or_setregs(pid);
1616 #endif /* ptrace_setregset_or_setregs */
1621 char buf[sizeof("syscall_%lu") + sizeof(long) * 3];
1625 free_sysent_buf(void *ptr)
1627 struct sysent_buf *s = ptr;
1628 s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1634 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1635 * 1: ok, continue in trace_syscall_entering().
1636 * other: error, trace_syscall_entering() should print error indicator
1637 * ("????" etc) and bail out.
1640 get_scno(struct tcb *tcp)
1645 int rc = arch_get_scno(tcp);
1649 if (SCNO_IS_VALID(tcp->scno)) {
1650 tcp->s_ent = &sysent[tcp->scno];
1651 tcp->qual_flg = qual_flags[tcp->scno];
1653 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1656 s->ent.nargs = MAX_ARGS;
1657 s->ent.sen = SEN_printargs;
1658 s->ent.sys_func = printargs;
1659 s->ent.sys_name = s->buf;
1660 sprintf(s->buf, "syscall_%lu", shuffle_scno(tcp->scno));
1662 tcp->s_ent = &s->ent;
1663 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1665 set_tcb_priv_data(tcp, s, free_sysent_buf);
1668 error_msg("pid %d invalid syscall %ld", tcp->pid, tcp->scno);
1673 #ifdef USE_GET_SYSCALL_RESULT_REGS
1674 static int get_syscall_result_regs(struct tcb *);
1678 * 1: ok, continue in trace_syscall_exiting().
1679 * -1: error, trace_syscall_exiting() should print error indicator
1680 * ("????" etc) and bail out.
1683 get_syscall_result(struct tcb *tcp)
1685 #ifdef USE_GET_SYSCALL_RESULT_REGS
1686 if (get_syscall_result_regs(tcp))
1690 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1695 #include "get_scno.c"
1696 #include "set_scno.c"
1697 #include "get_syscall_args.c"
1698 #ifdef USE_GET_SYSCALL_RESULT_REGS
1699 # include "get_syscall_result.c"
1701 #include "get_error.c"
1702 #include "set_error.c"
1703 #ifdef HAVE_GETREGS_OLD
1704 # include "getregs_old.c"