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_syscall(), qual_signal(), qual_desc();
364 static const struct qual_options {
365 unsigned int bitflag;
366 const char *option_name;
367 int (*qualify)(const char *, int, int);
368 const char *argument_name;
370 { QUAL_TRACE, "trace", qual_syscall, "system call" },
371 { QUAL_TRACE, "t", qual_syscall, "system call" },
372 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" },
373 { QUAL_ABBREV, "a", qual_syscall, "system call" },
374 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" },
375 { QUAL_VERBOSE, "v", qual_syscall, "system call" },
376 { QUAL_RAW, "raw", qual_syscall, "system call" },
377 { QUAL_RAW, "x", qual_syscall, "system call" },
378 { QUAL_SIGNAL, "signal", qual_signal, "signal" },
379 { QUAL_SIGNAL, "signals", qual_signal, "signal" },
380 { QUAL_SIGNAL, "s", qual_signal, "signal" },
381 { QUAL_READ, "read", qual_desc, "descriptor" },
382 { QUAL_READ, "reads", qual_desc, "descriptor" },
383 { QUAL_READ, "r", qual_desc, "descriptor" },
384 { QUAL_WRITE, "write", qual_desc, "descriptor" },
385 { QUAL_WRITE, "writes", qual_desc, "descriptor" },
386 { QUAL_WRITE, "w", qual_desc, "descriptor" },
387 { 0, NULL, NULL, NULL },
391 reallocate_qual(const unsigned int n)
395 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
396 qp = qual_vec[p] = xreallocarray(qual_vec[p], n,
398 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
404 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
409 reallocate_qual(n + 1);
411 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
412 if (pers == p || pers < 0) {
414 qual_vec[p][n] &= ~bitflag;
416 qual_vec[p][n] |= bitflag;
422 qual_syscall(const char *s, const unsigned int bitflag, const int not)
428 if (*s >= '0' && *s <= '9') {
429 i = string_to_uint(s);
430 if (i >= MAX_NSYSCALLS)
432 qualify_one(i, bitflag, not, -1);
436 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
437 for (i = 0; i < nsyscall_vec[p]; i++) {
438 if (sysent_vec[p][i].sys_name
439 && strcmp(s, sysent_vec[p][i].sys_name) == 0
441 qualify_one(i, bitflag, not, p);
451 qual_signal(const char *s, const unsigned int bitflag, const int not)
455 if (*s >= '0' && *s <= '9') {
456 int signo = string_to_uint(s);
457 if (signo < 0 || signo > 255)
459 qualify_one(signo, bitflag, not, -1);
462 if (strncasecmp(s, "SIG", 3) == 0)
464 for (i = 0; i <= NSIG; i++) {
465 if (strcasecmp(s, signame(i) + 3) == 0) {
466 qualify_one(i, bitflag, not, -1);
474 qual_desc(const char *s, const unsigned int bitflag, const int not)
476 if (*s >= '0' && *s <= '9') {
477 int desc = string_to_uint(s);
478 if (desc < 0 || desc > 0x7fff) /* paranoia */
480 qualify_one(desc, bitflag, not, -1);
487 lookup_class(const char *s)
489 if (strcmp(s, "file") == 0)
491 if (strcmp(s, "ipc") == 0)
493 if (strcmp(s, "network") == 0)
494 return TRACE_NETWORK;
495 if (strcmp(s, "process") == 0)
496 return TRACE_PROCESS;
497 if (strcmp(s, "signal") == 0)
499 if (strcmp(s, "desc") == 0)
501 if (strcmp(s, "memory") == 0)
507 qualify(const char *s)
509 const struct qual_options *opt;
516 reallocate_qual(MIN_QUALS);
518 opt = &qual_options[0];
519 for (i = 0; (p = qual_options[i].option_name); i++) {
520 unsigned int len = strlen(p);
521 if (strncmp(s, p, len) == 0 && s[len] == '=') {
522 opt = &qual_options[i];
532 if (strcmp(s, "none") == 0) {
536 if (strcmp(s, "all") == 0) {
537 for (i = 0; i < num_quals; i++) {
538 qualify_one(i, opt->bitflag, not, -1);
542 for (i = 0; i < num_quals; i++) {
543 qualify_one(i, opt->bitflag, !not, -1);
546 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
548 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
550 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
551 for (i = 0; i < nsyscall_vec[pers]; i++)
552 if (sysent_vec[pers][i].sys_flags & n)
553 qualify_one(i, opt->bitflag, not, pers);
557 if (opt->qualify(p, opt->bitflag, not)) {
558 error_msg_and_die("invalid %s '%s'",
559 opt->argument_name, p);
566 #ifdef SYS_socket_subcall
568 decode_socket_subcall(struct tcb *tcp)
573 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
576 tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
577 tcp->qual_flg = qual_flags[tcp->scno];
578 tcp->s_ent = &sysent[tcp->scno];
579 addr = tcp->u_arg[1];
580 n = tcp->s_ent->nargs;
581 if (sizeof(tcp->u_arg[0]) == current_wordsize) {
582 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
583 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
585 unsigned int args[n];
588 memset(args, 0, sizeof(args));
589 (void) umove(tcp, addr, &args);
590 for (i = 0; i < n; ++i)
591 tcp->u_arg[i] = args[i];
596 #ifdef SYS_ipc_subcall
598 decode_ipc_subcall(struct tcb *tcp)
602 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
605 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
606 tcp->qual_flg = qual_flags[tcp->scno];
607 tcp->s_ent = &sysent[tcp->scno];
608 n = tcp->s_ent->nargs;
609 for (i = 0; i < n; i++)
610 tcp->u_arg[i] = tcp->u_arg[i + 1];
616 decode_mips_subcall(struct tcb *tcp)
618 if (!SCNO_IS_VALID(tcp->u_arg[0]))
620 tcp->scno = tcp->u_arg[0];
621 tcp->qual_flg = qual_flags[tcp->scno];
622 tcp->s_ent = &sysent[tcp->scno];
623 memmove(&tcp->u_arg[0], &tcp->u_arg[1],
624 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
626 * Fetching the last arg of 7-arg syscalls (fadvise64_64
627 * and sync_file_range) would require additional code,
628 * see linux/mips/get_syscall_args.c
634 printargs(struct tcb *tcp)
638 int n = tcp->s_ent->nargs;
639 for (i = 0; i < n; i++)
640 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
646 printargs_u(struct tcb *tcp)
648 const int n = tcp->s_ent->nargs;
650 for (i = 0; i < n; ++i)
651 tprintf("%s%u", i ? ", " : "",
652 (unsigned int) tcp->u_arg[i]);
657 printargs_d(struct tcb *tcp)
659 const int n = tcp->s_ent->nargs;
661 for (i = 0; i < n; ++i)
662 tprintf("%s%d", i ? ", " : "",
663 (int) tcp->u_arg[i]);
668 dumpio(struct tcb *tcp)
674 if ((unsigned long) tcp->u_arg[0] >= num_quals)
676 sen = tcp->s_ent->sen;
677 if (SEN_printargs == sen)
679 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
685 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
689 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
693 dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
696 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
700 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
706 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
711 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
714 dumpiov_in_msghdr(tcp, tcp->u_arg[1],
715 (unsigned long) -1L);
718 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
725 * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
726 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
728 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
730 shuffle_scno(unsigned long scno)
732 if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
735 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
736 if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
738 if (scno == 0x000ffff0)
739 return ARM_FIRST_SHUFFLED_SYSCALL;
741 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
743 * Is it ARM specific syscall?
744 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
745 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
747 if (scno >= 0x000f0000 &&
748 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
749 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
751 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
752 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
758 # define shuffle_scno(scno) ((long)(scno))
762 syscall_name(long scno)
764 static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
766 if (SCNO_IS_VALID(scno))
767 return sysent[scno].sys_name;
769 sprintf(buf, "syscall_%lu", shuffle_scno(scno));
774 static long get_regs_error;
782 static int get_syscall_args(struct tcb *);
783 static int get_syscall_result(struct tcb *);
784 static int arch_get_scno(struct tcb *tcp);
785 static void get_error(struct tcb *, const bool);
786 #if defined X86_64 || defined POWERPC
787 static int getregs_old(pid_t);
791 trace_syscall_entering(struct tcb *tcp)
795 scno_good = res = get_scno(tcp);
799 res = get_syscall_args(tcp);
804 tprints("????" /* anti-trigraph gap */ "(");
805 else if (tcp->qual_flg & UNDEFINED_SCNO)
806 tprintf("%s(", syscall_name(tcp->scno));
808 tprintf("%s(", tcp->s_ent->sys_name);
810 * " <unavailable>" will be added later by the code which
811 * detects ptrace errors.
817 if (SEN_syscall == tcp->s_ent->sen)
818 decode_mips_subcall(tcp);
821 if ( SEN_execve == tcp->s_ent->sen
822 # if defined(SPARC) || defined(SPARC64)
823 || SEN_execv == tcp->s_ent->sen
826 hide_log_until_execve = 0;
829 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
830 switch (tcp->s_ent->sen) {
831 # ifdef SYS_socket_subcall
833 decode_socket_subcall(tcp);
836 # ifdef SYS_ipc_subcall
838 decode_ipc_subcall(tcp);
844 if (!(tcp->qual_flg & QUAL_TRACE)
845 || (tracing_paths && !pathtrace_match(tcp))
847 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
848 tcp->sys_func_rval = 0;
852 tcp->flags &= ~TCB_FILTERED;
854 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
860 if (stack_trace_enabled) {
861 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
862 unwind_capture_stacktrace(tcp);
867 if (tcp->qual_flg & UNDEFINED_SCNO)
868 tprintf("%s(", syscall_name(tcp->scno));
870 tprintf("%s(", tcp->s_ent->sys_name);
871 if ((tcp->qual_flg & QUAL_RAW) && SEN_exit != tcp->s_ent->sen)
872 res = printargs(tcp);
874 res = tcp->s_ent->sys_func(tcp);
878 tcp->flags |= TCB_INSYSCALL;
879 tcp->sys_func_rval = res;
880 /* Measure the entrance time as late as possible to avoid errors. */
882 gettimeofday(&tcp->etime, NULL);
887 trace_syscall_exiting(struct tcb *tcp)
894 /* Measure the exit time as early as possible to avoid errors. */
896 gettimeofday(&tv, NULL);
899 if (stack_trace_enabled) {
900 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
901 unwind_cache_invalidate(tcp);
905 #if SUPPORTED_PERSONALITIES > 1
906 update_personality(tcp, tcp->currpers);
908 res = (get_regs_error ? -1 : get_syscall_result(tcp));
909 if (filtered(tcp) || hide_log_until_execve)
913 count_syscall(tcp, &tv);
914 if (cflag == CFLAG_ONLY_STATS) {
919 /* If not in -ff mode, and printing_tcp != tcp,
920 * then the log currently does not end with output
921 * of _our syscall entry_, but with something else.
922 * We need to say which syscall's return is this.
924 * Forced reprinting via TCB_REPRINT is used only by
925 * "strace -ff -oLOG test/threaded_execve" corner case.
926 * It's the only case when -ff mode needs reprinting.
928 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
929 tcp->flags &= ~TCB_REPRINT;
931 if (tcp->qual_flg & UNDEFINED_SCNO)
932 tprintf("<... %s resumed> ", syscall_name(tcp->scno));
934 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
938 tcp->s_prev_ent = NULL;
940 /* There was error in one of prior ptrace ops */
943 tprints("= ? <unavailable>\n");
945 tcp->flags &= ~TCB_INSYSCALL;
946 tcp->sys_func_rval = 0;
949 tcp->s_prev_ent = tcp->s_ent;
952 if (tcp->qual_flg & QUAL_RAW) {
953 /* sys_res = printargs(tcp); - but it's nop on sysexit */
955 /* FIXME: not_failing_only (IOW, option -z) is broken:
956 * failure of syscall is known only after syscall return.
957 * Thus we end up with something like this on, say, ENOENT:
958 * open("doesnt_exist", O_RDONLY <unfinished ...>
959 * {next syscall decode}
960 * whereas the intended result is that open(...) line
961 * is not shown at all.
963 if (not_failing_only && tcp->u_error)
964 goto ret; /* ignore failed syscalls */
965 if (tcp->sys_func_rval & RVAL_DECODED)
966 sys_res = tcp->sys_func_rval;
968 sys_res = tcp->s_ent->sys_func(tcp);
973 u_error = tcp->u_error;
974 if (tcp->qual_flg & QUAL_RAW) {
976 tprintf("= -1 (errno %ld)", u_error);
978 tprintf("= %#lx", tcp->u_rval);
980 else if (!(sys_res & RVAL_NONE) && u_error) {
982 /* Blocked signals do not interrupt any syscalls.
983 * In this case syscalls don't return ERESTARTfoo codes.
985 * Deadly signals set to SIG_DFL interrupt syscalls
986 * and kill the process regardless of which of the codes below
987 * is returned by the interrupted syscall.
988 * In some cases, kernel forces a kernel-generated deadly
989 * signal to be unblocked and set to SIG_DFL (and thus cause
990 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
991 * or SIGILL. (The alternative is to leave process spinning
992 * forever on the faulty instruction - not useful).
994 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
995 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
996 * but kernel will always restart them.
999 /* Most common type of signal-interrupted syscall exit code.
1000 * The system call will be restarted with the same arguments
1001 * if SA_RESTART is set; otherwise, it will fail with EINTR.
1003 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
1005 case ERESTARTNOINTR:
1006 /* Rare. For example, fork() returns this if interrupted.
1007 * SA_RESTART is ignored (assumed set): the restart is unconditional.
1009 tprints("= ? ERESTARTNOINTR (To be restarted)");
1011 case ERESTARTNOHAND:
1012 /* pause(), rt_sigsuspend() etc use this code.
1013 * SA_RESTART is ignored (assumed not set):
1014 * syscall won't restart (will return EINTR instead)
1015 * even after signal with SA_RESTART set. However,
1016 * after SIG_IGN or SIG_DFL signal it will restart
1017 * (thus the name "restart only if has no handler").
1019 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
1021 case ERESTART_RESTARTBLOCK:
1022 /* Syscalls like nanosleep(), poll() which can't be
1023 * restarted with their original arguments use this
1024 * code. Kernel will execute restart_syscall() instead,
1025 * which changes arguments before restarting syscall.
1026 * SA_RESTART is ignored (assumed not set) similarly
1027 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1028 * since restart data is saved in "restart block"
1029 * in task struct, and if signal handler uses a syscall
1030 * which in turn saves another such restart block,
1031 * old data is lost and restart becomes impossible)
1033 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1036 if ((unsigned long) u_error < nerrnos
1037 && errnoent[u_error])
1038 tprintf("= -1 %s (%s)", errnoent[u_error],
1041 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1045 if ((sys_res & RVAL_STR) && tcp->auxstr)
1046 tprintf(" (%s)", tcp->auxstr);
1049 if (sys_res & RVAL_NONE)
1052 switch (sys_res & RVAL_MASK) {
1054 #if SUPPORTED_PERSONALITIES > 1
1055 if (current_wordsize < sizeof(long))
1057 (unsigned int) tcp->u_rval);
1060 tprintf("= %#lx", tcp->u_rval);
1063 tprintf("= %#lo", tcp->u_rval);
1066 #if SUPPORTED_PERSONALITIES > 1
1067 if (current_wordsize < sizeof(long))
1069 (unsigned int) tcp->u_rval);
1072 tprintf("= %lu", tcp->u_rval);
1075 tprintf("= %ld", tcp->u_rval);
1080 printfd(tcp, tcp->u_rval);
1083 tprintf("= %ld", tcp->u_rval);
1085 #if defined(LINUX_MIPSN32) || defined(X32)
1088 tprintf("= %#llx", tcp->u_lrval);
1091 tprintf("= %#llo", tcp->u_lrval);
1094 case RVAL_LUDECIMAL:
1095 tprintf("= %llu", tcp->u_lrval);
1099 tprintf("= %lld", tcp->u_lrval);
1104 error_msg("invalid rval format");
1108 if ((sys_res & RVAL_STR) && tcp->auxstr)
1109 tprintf(" (%s)", tcp->auxstr);
1112 tv_sub(&tv, &tv, &tcp->etime);
1113 tprintf(" <%ld.%06ld>",
1114 (long) tv.tv_sec, (long) tv.tv_usec);
1120 #ifdef USE_LIBUNWIND
1121 if (stack_trace_enabled)
1122 unwind_print_stacktrace(tcp);
1126 tcp->flags &= ~TCB_INSYSCALL;
1127 tcp->sys_func_rval = 0;
1132 trace_syscall(struct tcb *tcp)
1134 return exiting(tcp) ?
1135 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1139 is_erestart(struct tcb *tcp)
1141 switch (tcp->u_error) {
1143 case ERESTARTNOINTR:
1144 case ERESTARTNOHAND:
1145 case ERESTART_RESTARTBLOCK:
1152 static int saved_u_error;
1155 temporarily_clear_syserror(struct tcb *tcp)
1157 saved_u_error = tcp->u_error;
1162 restore_cleared_syserror(struct tcb *tcp)
1164 tcp->u_error = saved_u_error;
1167 #include "kernel_types.h"
1170 * Check the syscall return value register value for whether it is
1171 * a negated errno code indicating an error, or a success return value.
1174 is_negated_errno(kernel_ulong_t val)
1176 /* Linux kernel defines MAX_ERRNO to 4095. */
1177 kernel_ulong_t max = -(kernel_long_t) 4095;
1179 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1180 if (current_wordsize < sizeof(val)) {
1181 val = (uint32_t) val;
1182 max = (uint32_t) max;
1186 * current_wordsize is 4 even in personality 0 (native X32)
1187 * but truncation _must not_ be done in it.
1188 * can't check current_wordsize here!
1190 if (current_personality != 0) {
1191 val = (uint32_t) val;
1192 max = (uint32_t) max;
1199 #include "arch_regs.c"
1201 #ifdef HAVE_GETRVAL2
1202 # include "arch_getrval2.c"
1206 print_pc(struct tcb *tcp)
1208 #if defined ARCH_PC_REG
1209 # define ARCH_GET_PC 0
1210 #elif defined ARCH_PC_PEEK_ADDR
1212 # define ARCH_PC_REG pc
1213 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1215 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1217 if (get_regs_error || ARCH_GET_PC)
1218 tprints(current_wordsize == 4 ? "[????????] "
1219 : "[????????????????] ");
1221 tprintf(current_wordsize == 4 ? "[%08lx] " : "[%016lx] ",
1222 (unsigned long) ARCH_PC_REG);
1225 #if defined ARCH_REGS_FOR_GETREGSET
1227 get_regset(pid_t pid)
1229 # ifdef ARCH_IOVEC_FOR_GETREGSET
1230 /* variable iovec */
1231 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1232 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1233 &ARCH_IOVEC_FOR_GETREGSET);
1235 /* constant iovec */
1236 static struct iovec io = {
1237 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1238 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1240 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1244 #endif /* ARCH_REGS_FOR_GETREGSET */
1249 #undef USE_GET_SYSCALL_RESULT_REGS
1250 #ifdef ARCH_REGS_FOR_GETREGSET
1252 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1253 static int getregset_support;
1255 if (getregset_support >= 0) {
1256 get_regs_error = get_regset(pid);
1257 if (getregset_support > 0)
1259 if (get_regs_error >= 0) {
1260 getregset_support = 1;
1263 if (errno == EPERM || errno == ESRCH)
1265 getregset_support = -1;
1267 get_regs_error = getregs_old(pid);
1268 # else /* !X86_64 */
1269 /* Assume that PTRACE_GETREGSET works. */
1270 get_regs_error = get_regset(pid);
1272 #elif defined ARCH_REGS_FOR_GETREGS
1273 # if defined SPARC || defined SPARC64
1274 /* SPARC systems have the meaning of data and addr reversed */
1275 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1276 # elif defined POWERPC
1277 static bool old_kernel = 0;
1280 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1281 if (get_regs_error && errno == EIO) {
1284 get_regs_error = getregs_old(pid);
1287 /* Assume that PTRACE_GETREGS works. */
1288 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1291 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1292 # define USE_GET_SYSCALL_RESULT_REGS 1
1293 # warning get_regs is not implemented for this architecture yet
1300 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1301 * 1: ok, continue in trace_syscall_entering().
1302 * other: error, trace_syscall_entering() should print error indicator
1303 * ("????" etc) and bail out.
1306 get_scno(struct tcb *tcp)
1311 int rc = arch_get_scno(tcp);
1315 if (SCNO_IS_VALID(tcp->scno)) {
1316 tcp->s_ent = &sysent[tcp->scno];
1317 tcp->qual_flg = qual_flags[tcp->scno];
1319 static const struct_sysent unknown = {
1322 .sys_func = printargs,
1323 .sys_name = "system call",
1325 tcp->s_ent = &unknown;
1326 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1328 error_msg("pid %d invalid syscall %ld", tcp->pid, tcp->scno);
1333 #ifdef USE_GET_SYSCALL_RESULT_REGS
1334 static int get_syscall_result_regs(struct tcb *);
1338 * 1: ok, continue in trace_syscall_exiting().
1339 * -1: error, trace_syscall_exiting() should print error indicator
1340 * ("????" etc) and bail out.
1343 get_syscall_result(struct tcb *tcp)
1345 #ifdef USE_GET_SYSCALL_RESULT_REGS
1346 if (get_syscall_result_regs(tcp))
1350 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1355 #include "get_scno.c"
1356 #include "get_syscall_args.c"
1357 #ifdef USE_GET_SYSCALL_RESULT_REGS
1358 # include "get_syscall_result.c"
1360 #include "get_error.c"
1361 #if defined X86_64 || defined POWERPC
1362 # include "getregs_old.c"