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)
570 const int call = tcp->u_arg[0];
572 if (call < 1 || call >= SYS_socket_nsubcalls)
575 const unsigned long scno = SYS_socket_subcall + call;
576 const unsigned int nargs = sysent[scno].nargs;
579 if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
583 tcp->qual_flg = qual_flags[scno];
584 tcp->s_ent = &sysent[scno];
587 for (i = 0; i < nargs; ++i)
588 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
589 ? ((uint32_t *) buf)[i] : buf[i];
593 #ifdef SYS_ipc_subcall
595 decode_ipc_subcall(struct tcb *tcp)
597 unsigned int call = tcp->u_arg[0];
598 const unsigned int version = call >> 16;
601 # if defined S390 || defined S390X
605 if (current_wordsize == 8)
608 set_tcb_priv_ulong(tcp, version);
614 case 1: case 2: case 3: case 4:
615 case 11: case 12: case 13: case 14:
616 case 21: case 22: case 23: case 24:
622 tcp->scno = SYS_ipc_subcall + call;
623 tcp->qual_flg = qual_flags[tcp->scno];
624 tcp->s_ent = &sysent[tcp->scno];
626 const unsigned int n = tcp->s_ent->nargs;
628 for (i = 0; i < n; i++)
629 tcp->u_arg[i] = tcp->u_arg[i + 1];
635 decode_mips_subcall(struct tcb *tcp)
637 if (!SCNO_IS_VALID(tcp->u_arg[0]))
639 tcp->scno = tcp->u_arg[0];
640 tcp->qual_flg = qual_flags[tcp->scno];
641 tcp->s_ent = &sysent[tcp->scno];
642 memmove(&tcp->u_arg[0], &tcp->u_arg[1],
643 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
645 * Fetching the last arg of 7-arg syscalls (fadvise64_64
646 * and sync_file_range) would require additional code,
647 * see linux/mips/get_syscall_args.c
653 dumpio(struct tcb *tcp)
659 if ((unsigned long) tcp->u_arg[0] >= num_quals)
661 sen = tcp->s_ent->sen;
662 if (SEN_printargs == sen)
664 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
670 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
675 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
679 dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
682 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
686 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
692 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
698 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
701 dumpiov_in_msghdr(tcp, tcp->u_arg[1],
702 (unsigned long) -1L);
705 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
712 * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
713 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
715 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
717 shuffle_scno(unsigned long scno)
719 if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
722 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
723 if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
725 if (scno == 0x000ffff0)
726 return ARM_FIRST_SHUFFLED_SYSCALL;
728 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
730 * Is it ARM specific syscall?
731 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
732 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
734 if (scno >= 0x000f0000 &&
735 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
736 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
738 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
739 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
745 # define shuffle_scno(scno) ((long)(scno))
749 syscall_name(long scno)
751 static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
753 if (SCNO_IS_VALID(scno))
754 return sysent[scno].sys_name;
756 sprintf(buf, "syscall_%lu", shuffle_scno(scno));
761 static long get_regs_error;
769 static int get_syscall_args(struct tcb *);
770 static int get_syscall_result(struct tcb *);
771 static int arch_get_scno(struct tcb *tcp);
772 static void get_error(struct tcb *, const bool);
773 #if defined X86_64 || defined POWERPC
774 static int getregs_old(pid_t);
778 trace_syscall_entering(struct tcb *tcp)
782 scno_good = res = get_scno(tcp);
786 res = get_syscall_args(tcp);
791 tprints("????" /* anti-trigraph gap */ "(");
793 tprintf("%s(", syscall_name(tcp->scno));
795 * " <unavailable>" will be added later by the code which
796 * detects ptrace errors.
802 if (SEN_syscall == tcp->s_ent->sen)
803 decode_mips_subcall(tcp);
806 if ( SEN_execve == tcp->s_ent->sen
807 # if defined(SPARC) || defined(SPARC64)
808 || SEN_execv == tcp->s_ent->sen
811 hide_log_until_execve = 0;
814 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
815 switch (tcp->s_ent->sen) {
816 # ifdef SYS_socket_subcall
818 decode_socket_subcall(tcp);
821 # ifdef SYS_ipc_subcall
823 decode_ipc_subcall(tcp);
829 if (!(tcp->qual_flg & QUAL_TRACE)
830 || (tracing_paths && !pathtrace_match(tcp))
832 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
833 tcp->sys_func_rval = 0;
837 tcp->flags &= ~TCB_FILTERED;
839 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
845 if (stack_trace_enabled) {
846 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
847 unwind_capture_stacktrace(tcp);
852 tprintf("%s(", syscall_name(tcp->scno));
853 if ((tcp->qual_flg & QUAL_RAW) && SEN_exit != tcp->s_ent->sen)
854 res = printargs(tcp);
856 res = tcp->s_ent->sys_func(tcp);
860 tcp->flags |= TCB_INSYSCALL;
861 tcp->sys_func_rval = res;
862 /* Measure the entrance time as late as possible to avoid errors. */
864 gettimeofday(&tcp->etime, NULL);
869 trace_syscall_exiting(struct tcb *tcp)
876 /* Measure the exit time as early as possible to avoid errors. */
878 gettimeofday(&tv, NULL);
881 if (stack_trace_enabled) {
882 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
883 unwind_cache_invalidate(tcp);
887 #if SUPPORTED_PERSONALITIES > 1
888 update_personality(tcp, tcp->currpers);
890 res = (get_regs_error ? -1 : get_syscall_result(tcp));
891 if (filtered(tcp) || hide_log_until_execve)
895 count_syscall(tcp, &tv);
896 if (cflag == CFLAG_ONLY_STATS) {
901 /* If not in -ff mode, and printing_tcp != tcp,
902 * then the log currently does not end with output
903 * of _our syscall entry_, but with something else.
904 * We need to say which syscall's return is this.
906 * Forced reprinting via TCB_REPRINT is used only by
907 * "strace -ff -oLOG test/threaded_execve" corner case.
908 * It's the only case when -ff mode needs reprinting.
910 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
911 tcp->flags &= ~TCB_REPRINT;
913 tprintf("<... %s resumed> ", syscall_name(tcp->scno));
917 tcp->s_prev_ent = NULL;
919 /* There was error in one of prior ptrace ops */
922 tprints("= ? <unavailable>\n");
924 tcp->flags &= ~TCB_INSYSCALL;
925 tcp->sys_func_rval = 0;
926 free_tcb_priv_data(tcp);
929 tcp->s_prev_ent = tcp->s_ent;
932 if (tcp->qual_flg & QUAL_RAW) {
933 /* sys_res = printargs(tcp); - but it's nop on sysexit */
935 /* FIXME: not_failing_only (IOW, option -z) is broken:
936 * failure of syscall is known only after syscall return.
937 * Thus we end up with something like this on, say, ENOENT:
938 * open("doesnt_exist", O_RDONLY <unfinished ...>
939 * {next syscall decode}
940 * whereas the intended result is that open(...) line
941 * is not shown at all.
943 if (not_failing_only && tcp->u_error)
944 goto ret; /* ignore failed syscalls */
945 if (tcp->sys_func_rval & RVAL_DECODED)
946 sys_res = tcp->sys_func_rval;
948 sys_res = tcp->s_ent->sys_func(tcp);
953 u_error = tcp->u_error;
954 if (tcp->qual_flg & QUAL_RAW) {
956 tprintf("= -1 (errno %ld)", u_error);
958 tprintf("= %#lx", tcp->u_rval);
960 else if (!(sys_res & RVAL_NONE) && u_error) {
962 /* Blocked signals do not interrupt any syscalls.
963 * In this case syscalls don't return ERESTARTfoo codes.
965 * Deadly signals set to SIG_DFL interrupt syscalls
966 * and kill the process regardless of which of the codes below
967 * is returned by the interrupted syscall.
968 * In some cases, kernel forces a kernel-generated deadly
969 * signal to be unblocked and set to SIG_DFL (and thus cause
970 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
971 * or SIGILL. (The alternative is to leave process spinning
972 * forever on the faulty instruction - not useful).
974 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
975 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
976 * but kernel will always restart them.
979 /* Most common type of signal-interrupted syscall exit code.
980 * The system call will be restarted with the same arguments
981 * if SA_RESTART is set; otherwise, it will fail with EINTR.
983 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
986 /* Rare. For example, fork() returns this if interrupted.
987 * SA_RESTART is ignored (assumed set): the restart is unconditional.
989 tprints("= ? ERESTARTNOINTR (To be restarted)");
992 /* pause(), rt_sigsuspend() etc use this code.
993 * SA_RESTART is ignored (assumed not set):
994 * syscall won't restart (will return EINTR instead)
995 * even after signal with SA_RESTART set. However,
996 * after SIG_IGN or SIG_DFL signal it will restart
997 * (thus the name "restart only if has no handler").
999 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
1001 case ERESTART_RESTARTBLOCK:
1002 /* Syscalls like nanosleep(), poll() which can't be
1003 * restarted with their original arguments use this
1004 * code. Kernel will execute restart_syscall() instead,
1005 * which changes arguments before restarting syscall.
1006 * SA_RESTART is ignored (assumed not set) similarly
1007 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1008 * since restart data is saved in "restart block"
1009 * in task struct, and if signal handler uses a syscall
1010 * which in turn saves another such restart block,
1011 * old data is lost and restart becomes impossible)
1013 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1016 if ((unsigned long) u_error < nerrnos
1017 && errnoent[u_error])
1018 tprintf("= -1 %s (%s)", errnoent[u_error],
1021 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1025 if ((sys_res & RVAL_STR) && tcp->auxstr)
1026 tprintf(" (%s)", tcp->auxstr);
1029 if (sys_res & RVAL_NONE)
1032 switch (sys_res & RVAL_MASK) {
1034 #if SUPPORTED_PERSONALITIES > 1
1035 if (current_wordsize < sizeof(long))
1037 (unsigned int) tcp->u_rval);
1040 tprintf("= %#lx", tcp->u_rval);
1043 tprintf("= %#lo", tcp->u_rval);
1046 #if SUPPORTED_PERSONALITIES > 1
1047 if (current_wordsize < sizeof(long))
1049 (unsigned int) tcp->u_rval);
1052 tprintf("= %lu", tcp->u_rval);
1055 tprintf("= %ld", tcp->u_rval);
1060 printfd(tcp, tcp->u_rval);
1063 tprintf("= %ld", tcp->u_rval);
1065 #if HAVE_STRUCT_TCB_EXT_ARG
1068 tprintf("= %#llx", tcp->u_lrval);
1071 tprintf("= %#llo", tcp->u_lrval);
1074 case RVAL_LUDECIMAL:
1075 tprintf("= %llu", tcp->u_lrval);
1079 tprintf("= %lld", tcp->u_lrval);
1082 #endif /* HAVE_STRUCT_TCB_EXT_ARG */
1084 error_msg("invalid rval format");
1088 if ((sys_res & RVAL_STR) && tcp->auxstr)
1089 tprintf(" (%s)", tcp->auxstr);
1092 tv_sub(&tv, &tv, &tcp->etime);
1093 tprintf(" <%ld.%06ld>",
1094 (long) tv.tv_sec, (long) tv.tv_usec);
1100 #ifdef USE_LIBUNWIND
1101 if (stack_trace_enabled)
1102 unwind_print_stacktrace(tcp);
1106 tcp->flags &= ~TCB_INSYSCALL;
1107 tcp->sys_func_rval = 0;
1108 free_tcb_priv_data(tcp);
1113 trace_syscall(struct tcb *tcp)
1115 return exiting(tcp) ?
1116 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1120 is_erestart(struct tcb *tcp)
1122 switch (tcp->u_error) {
1124 case ERESTARTNOINTR:
1125 case ERESTARTNOHAND:
1126 case ERESTART_RESTARTBLOCK:
1133 static int saved_u_error;
1136 temporarily_clear_syserror(struct tcb *tcp)
1138 saved_u_error = tcp->u_error;
1143 restore_cleared_syserror(struct tcb *tcp)
1145 tcp->u_error = saved_u_error;
1148 #include "kernel_types.h"
1151 * Check the syscall return value register value for whether it is
1152 * a negated errno code indicating an error, or a success return value.
1155 is_negated_errno(kernel_ulong_t val)
1157 /* Linux kernel defines MAX_ERRNO to 4095. */
1158 kernel_ulong_t max = -(kernel_long_t) 4095;
1160 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1161 if (current_wordsize < sizeof(val)) {
1162 val = (uint32_t) val;
1163 max = (uint32_t) max;
1167 * current_wordsize is 4 even in personality 0 (native X32)
1168 * but truncation _must not_ be done in it.
1169 * can't check current_wordsize here!
1171 if (current_personality != 0) {
1172 val = (uint32_t) val;
1173 max = (uint32_t) max;
1180 #include "arch_regs.c"
1182 #ifdef HAVE_GETRVAL2
1183 # include "arch_getrval2.c"
1187 print_pc(struct tcb *tcp)
1189 #if defined ARCH_PC_REG
1190 # define ARCH_GET_PC 0
1191 #elif defined ARCH_PC_PEEK_ADDR
1193 # define ARCH_PC_REG pc
1194 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1196 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1198 if (get_regs_error || ARCH_GET_PC)
1199 tprints(current_wordsize == 4 ? "[????????] "
1200 : "[????????????????] ");
1202 tprintf(current_wordsize == 4 ? "[%08lx] " : "[%016lx] ",
1203 (unsigned long) ARCH_PC_REG);
1206 #if defined ARCH_REGS_FOR_GETREGSET
1208 get_regset(pid_t pid)
1210 # ifdef ARCH_IOVEC_FOR_GETREGSET
1211 /* variable iovec */
1212 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1213 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1214 &ARCH_IOVEC_FOR_GETREGSET);
1216 /* constant iovec */
1217 static struct iovec io = {
1218 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1219 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1221 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1225 #endif /* ARCH_REGS_FOR_GETREGSET */
1230 #undef USE_GET_SYSCALL_RESULT_REGS
1231 #ifdef ARCH_REGS_FOR_GETREGSET
1233 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1234 static int getregset_support;
1236 if (getregset_support >= 0) {
1237 get_regs_error = get_regset(pid);
1238 if (getregset_support > 0)
1240 if (get_regs_error >= 0) {
1241 getregset_support = 1;
1244 if (errno == EPERM || errno == ESRCH)
1246 getregset_support = -1;
1248 get_regs_error = getregs_old(pid);
1249 # else /* !X86_64 */
1250 /* Assume that PTRACE_GETREGSET works. */
1251 get_regs_error = get_regset(pid);
1253 #elif defined ARCH_REGS_FOR_GETREGS
1254 # if defined SPARC || defined SPARC64
1255 /* SPARC systems have the meaning of data and addr reversed */
1257 ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1258 # elif defined POWERPC
1259 static bool old_kernel = 0;
1262 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1263 if (get_regs_error && errno == EIO) {
1266 get_regs_error = getregs_old(pid);
1269 /* Assume that PTRACE_GETREGS works. */
1270 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1273 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1274 # define USE_GET_SYSCALL_RESULT_REGS 1
1275 # warning get_regs is not implemented for this architecture yet
1282 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1283 * 1: ok, continue in trace_syscall_entering().
1284 * other: error, trace_syscall_entering() should print error indicator
1285 * ("????" etc) and bail out.
1288 get_scno(struct tcb *tcp)
1293 int rc = arch_get_scno(tcp);
1297 if (SCNO_IS_VALID(tcp->scno)) {
1298 tcp->s_ent = &sysent[tcp->scno];
1299 tcp->qual_flg = qual_flags[tcp->scno];
1301 static const struct_sysent unknown = {
1304 .sys_func = printargs,
1305 .sys_name = "system call",
1307 tcp->s_ent = &unknown;
1308 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1310 error_msg("pid %d invalid syscall %ld", tcp->pid, tcp->scno);
1315 #ifdef USE_GET_SYSCALL_RESULT_REGS
1316 static int get_syscall_result_regs(struct tcb *);
1320 * 1: ok, continue in trace_syscall_exiting().
1321 * -1: error, trace_syscall_exiting() should print error indicator
1322 * ("????" etc) and bail out.
1325 get_syscall_result(struct tcb *tcp)
1327 #ifdef USE_GET_SYSCALL_RESULT_REGS
1328 if (get_syscall_result_regs(tcp))
1332 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1337 #include "get_scno.c"
1338 #include "get_syscall_args.c"
1339 #ifdef USE_GET_SYSCALL_RESULT_REGS
1340 # include "get_syscall_result.c"
1342 #include "get_error.c"
1343 #if defined X86_64 || defined POWERPC
1344 # include "getregs_old.c"