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 n = string_to_uint_upto(s, MAX_NSYSCALLS - 1);
465 /* set bitflag for all syscall numbers except n */
467 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
470 for (i = 0; i < nsyscall_vec[p]; ++i) {
471 if (i != (unsigned int) n
472 && sysent_vec[p][i].sys_name) {
473 qualify_one(i, bitflag, 0, p, fopts);
478 qualify_one(n, bitflag, not, -1, fopts);
485 lookup_class(const char *s)
487 if (strcmp(s, "all") == 0)
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_syscall_class(const char *const s, const unsigned int bitflag,
508 const int not, const struct fault_opts *const fopts)
511 const int n = lookup_class(s);
516 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
519 for (i = 0; i < nsyscall_vec[p]; ++i) {
520 if (!sysent_vec[p][i].sys_name)
522 const bool match = (sysent_vec[p][i].sys_flags & n) == n;
523 if (match ^ (not && fopts)) {
524 qualify_one(i, bitflag, not && !fopts, p, fopts);
533 qualify_syscall_name(const char *const s, const unsigned int bitflag,
534 const int not, const struct fault_opts *const fopts)
539 for (p = 0; p < SUPPORTED_PERSONALITIES; ++p) {
542 for (i = 0; i < nsyscall_vec[p]; ++i) {
543 if (!sysent_vec[p][i].sys_name)
545 const bool match = !strcmp(s, sysent_vec[p][i].sys_name);
546 found = found || match;
547 if (match ^ (not && fopts)) {
548 qualify_one(i, bitflag, not && !fopts, p, fopts);
557 qual_syscall_ex(const char *const s, const unsigned int bitflag,
558 const int not, const struct fault_opts *const fopts)
560 if (qualify_scno(s, bitflag, not, fopts)
561 || qualify_syscall_class(s, bitflag, not, fopts)
562 || qualify_syscall_name(s, bitflag, not, fopts)) {
570 qual_syscall(const char *const s, const unsigned int bitflag, const int not)
572 return qual_syscall_ex(s, bitflag, not, NULL);
576 * Returns NULL if STR does not start with PREFIX,
577 * or a pointer to the first char in STR after PREFIX.
580 strip_prefix(const char *prefix, const char *str)
582 size_t len = strlen(prefix);
584 return strncmp(prefix, str, len) ? NULL : str + len;
588 find_errno_by_name(const char *name)
592 for (i = 1; i < nerrnos; ++i) {
593 if (errnoent[i] && (strcmp(name, errnoent[i]) == 0))
601 parse_fault_token(const char *const token, struct fault_opts *const fopts)
606 if ((val = strip_prefix("when=", token))) {
614 intval = string_to_uint_ex(val, &end, 0xffff, "+");
618 fopts->first = intval;
624 intval = string_to_uint_upto(val, 0xffff);
627 fopts->step = intval;
636 } else if ((val = strip_prefix("error=", token))) {
637 intval = string_to_uint_upto(val, 4095);
639 intval = find_errno_by_name(val);
651 parse_fault_expression(const char *const s, char **buf,
652 struct fault_opts *const fopts)
654 char *saveptr = NULL;
659 for (token = strtok_r(*buf, ":", &saveptr); token;
660 token = strtok_r(NULL, ":", &saveptr)) {
663 else if (!parse_fault_token(token, fopts))
676 qual_fault(const char *const s, const unsigned int bitflag, const int not)
678 struct fault_opts opts = {
685 char *name = parse_fault_expression(s, &buf, &opts);
686 char *saveptr = NULL;
693 for (token = strtok_r(name, ",", &saveptr); token;
694 token = strtok_r(NULL, ",", &saveptr)) {
695 rc = qual_syscall_ex(token, bitflag, not, &opts);
705 qual_signal(const char *s, const unsigned int bitflag, const int not)
709 if (*s >= '0' && *s <= '9') {
710 i = string_to_uint_upto(s, 255);
713 qualify_one(i, bitflag, not, -1, NULL);
716 if (strncasecmp(s, "SIG", 3) == 0)
718 for (i = 0; i <= NSIG; ++i) {
719 const char *name = signame(i);
720 if (strncasecmp(name, "SIG", 3) != 0)
724 if (strcasecmp(name, s) != 0)
726 qualify_one(i, bitflag, not, -1, NULL);
733 qual_desc(const char *s, const unsigned int bitflag, const int not)
735 int desc = string_to_uint_upto(s, 0x7fff);
738 qualify_one(desc, bitflag, not, -1, NULL);
743 qualify(const char *s)
745 const struct qual_options *opt;
751 if (num_quals == 0) {
752 reallocate_qual(MIN_QUALS);
753 reallocate_fault(MIN_QUALS);
756 opt = &qual_options[0];
757 for (i = 0; (p = qual_options[i].option_name); i++) {
758 unsigned int len = strlen(p);
759 if (strncmp(s, p, len) == 0 && s[len] == '=') {
760 opt = &qual_options[i];
770 if (strcmp(s, "none") == 0) {
774 if (opt->bitflag == QUAL_FAULT) {
775 if (opt->qualify(s, opt->bitflag, not)) {
776 error_msg_and_die("invalid %s '%s'",
777 opt->argument_name, s);
781 if (strcmp(s, "all") == 0) {
782 for (i = 0; i < num_quals; ++i) {
783 qualify_one(i, opt->bitflag, not, -1, NULL);
787 for (i = 0; i < num_quals; ++i) {
788 qualify_one(i, opt->bitflag, !not, -1, NULL);
791 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
792 if (opt->qualify(p, opt->bitflag, not)) {
793 error_msg_and_die("invalid %s '%s'",
794 opt->argument_name, p);
801 #ifdef SYS_socket_subcall
803 decode_socket_subcall(struct tcb *tcp)
805 const int call = tcp->u_arg[0];
807 if (call < 1 || call >= SYS_socket_nsubcalls)
810 const unsigned long scno = SYS_socket_subcall + call;
811 const unsigned int nargs = sysent[scno].nargs;
814 if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
818 tcp->qual_flg = qual_flags[scno];
819 tcp->s_ent = &sysent[scno];
822 for (i = 0; i < nargs; ++i)
823 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
824 ? ((uint32_t *) (void *) buf)[i] : buf[i];
828 #ifdef SYS_ipc_subcall
830 decode_ipc_subcall(struct tcb *tcp)
832 unsigned int call = tcp->u_arg[0];
833 const unsigned int version = call >> 16;
836 # if defined S390 || defined S390X
840 if (current_wordsize == 8)
843 set_tcb_priv_ulong(tcp, version);
849 case 1: case 2: case 3: case 4:
850 case 11: case 12: case 13: case 14:
851 case 21: case 22: case 23: case 24:
857 tcp->scno = SYS_ipc_subcall + call;
858 tcp->qual_flg = qual_flags[tcp->scno];
859 tcp->s_ent = &sysent[tcp->scno];
861 const unsigned int n = tcp->s_ent->nargs;
863 for (i = 0; i < n; i++)
864 tcp->u_arg[i] = tcp->u_arg[i + 1];
870 decode_mips_subcall(struct tcb *tcp)
872 if (!SCNO_IS_VALID(tcp->u_arg[0]))
874 tcp->scno = tcp->u_arg[0];
875 tcp->qual_flg = qual_flags[tcp->scno];
876 tcp->s_ent = &sysent[tcp->scno];
877 memmove(&tcp->u_arg[0], &tcp->u_arg[1],
878 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
880 * Fetching the last arg of 7-arg syscalls (fadvise64_64
881 * and sync_file_range) requires additional code,
882 * see linux/mips/get_syscall_args.c
884 if (tcp->s_ent->nargs == MAX_ARGS) {
886 mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
887 sizeof(tcp->u_arg[0]),
888 &tcp->u_arg[MAX_ARGS - 1]) < 0)
889 tcp->u_arg[MAX_ARGS - 1] = 0;
892 #endif /* LINUX_MIPSO32 */
895 dumpio(struct tcb *tcp)
900 int fd = tcp->u_arg[0];
901 if (fd < 0 || (unsigned int) fd >= num_quals)
904 if (qual_flags[fd] & QUAL_READ) {
905 switch (tcp->s_ent->sen) {
910 case SEN_mq_timedreceive:
911 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
916 dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
920 dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
923 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
927 if (qual_flags[fd] & QUAL_WRITE) {
928 switch (tcp->s_ent->sen) {
933 case SEN_mq_timedsend:
934 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
940 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
943 dumpiov_in_msghdr(tcp, tcp->u_arg[1],
944 (unsigned long) -1L);
947 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
954 * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
955 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
957 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
959 shuffle_scno(unsigned long scno)
961 if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
964 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
965 if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
967 if (scno == 0x000ffff0)
968 return ARM_FIRST_SHUFFLED_SYSCALL;
970 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
972 * Is it ARM specific syscall?
973 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
974 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
976 if (scno >= 0x000f0000 &&
977 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
978 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
980 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
981 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
987 # define shuffle_scno(scno) ((long)(scno))
991 syscall_name(long scno)
993 static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
995 if (SCNO_IS_VALID(scno))
996 return sysent[scno].sys_name;
998 sprintf(buf, "syscall_%lu", scno);
1004 err_name(unsigned long err)
1006 if ((err < nerrnos) && errnoent[err])
1007 return errnoent[err];
1012 static long get_regs_error;
1017 get_regs_error = -1;
1020 static int get_syscall_args(struct tcb *);
1021 static int get_syscall_result(struct tcb *);
1022 static int arch_get_scno(struct tcb *tcp);
1023 static int arch_set_scno(struct tcb *, long);
1024 static void get_error(struct tcb *, const bool);
1025 static int arch_set_error(struct tcb *);
1027 static struct fault_opts *
1028 tcb_fault_opts(struct tcb *tcp)
1030 return (SCNO_IN_RANGE(tcp->scno) && tcp->fault_vec[current_personality])
1031 ? &tcp->fault_vec[current_personality][tcp->scno] : NULL;
1036 inject_syscall_fault_entering(struct tcb *tcp)
1038 if (!tcp->fault_vec[current_personality]) {
1039 tcp->fault_vec[current_personality] =
1040 xreallocarray(NULL, num_faults,
1041 sizeof(struct fault_opts));
1042 memcpy(tcp->fault_vec[current_personality],
1043 fault_vec[current_personality],
1044 num_faults * sizeof(struct fault_opts));
1047 struct fault_opts *opts = tcb_fault_opts(tcp);
1049 if (opts->first == 0)
1054 if (opts->first != 0)
1057 opts->first = opts->step;
1059 if (!arch_set_scno(tcp, -1))
1060 tcp->flags |= TCB_FAULT_INJ;
1066 update_syscall_fault_exiting(struct tcb *tcp)
1068 struct fault_opts *opts = tcb_fault_opts(tcp);
1070 if (opts && opts->err && tcp->u_error != opts->err) {
1071 unsigned long u_error = tcp->u_error;
1072 tcp->u_error = opts->err;
1073 if (arch_set_error(tcp))
1074 tcp->u_error = u_error;
1081 trace_syscall_entering(struct tcb *tcp)
1085 scno_good = res = get_scno(tcp);
1089 res = get_syscall_args(tcp);
1093 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
1095 * " <unavailable>" will be added later by the code which
1096 * detects ptrace errors.
1101 #ifdef LINUX_MIPSO32
1102 if (SEN_syscall == tcp->s_ent->sen)
1103 decode_mips_subcall(tcp);
1106 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
1107 switch (tcp->s_ent->sen) {
1108 # ifdef SYS_socket_subcall
1109 case SEN_socketcall:
1110 decode_socket_subcall(tcp);
1113 # ifdef SYS_ipc_subcall
1115 decode_ipc_subcall(tcp);
1121 /* Restrain from fault injection while the trace executes strace code. */
1122 if (hide_log(tcp)) {
1123 tcp->qual_flg &= ~QUAL_FAULT;
1126 switch (tcp->s_ent->sen) {
1129 #if defined SPARC || defined SPARC64
1132 tcp->flags &= ~TCB_HIDE_LOG;
1136 if (!(tcp->qual_flg & QUAL_TRACE)
1137 || (tracing_paths && !pathtrace_match(tcp))
1139 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
1140 tcp->sys_func_rval = 0;
1144 tcp->flags &= ~TCB_FILTERED;
1146 if (hide_log(tcp)) {
1151 if (tcp->qual_flg & QUAL_FAULT)
1152 inject_syscall_fault_entering(tcp);
1154 if (cflag == CFLAG_ONLY_STATS) {
1159 #ifdef USE_LIBUNWIND
1160 if (stack_trace_enabled) {
1161 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
1162 unwind_capture_stacktrace(tcp);
1167 tprintf("%s(", tcp->s_ent->sys_name);
1168 if (tcp->qual_flg & QUAL_RAW)
1169 res = printargs(tcp);
1171 res = tcp->s_ent->sys_func(tcp);
1175 tcp->flags |= TCB_INSYSCALL;
1176 tcp->sys_func_rval = res;
1177 /* Measure the entrance time as late as possible to avoid errors. */
1179 gettimeofday(&tcp->etime, NULL);
1184 syscall_fault_injected(struct tcb *tcp)
1186 return tcp->flags & TCB_FAULT_INJ;
1190 trace_syscall_exiting(struct tcb *tcp)
1195 unsigned long u_error;
1196 const char *u_error_str;
1198 /* Measure the exit time as early as possible to avoid errors. */
1200 gettimeofday(&tv, NULL);
1202 #ifdef USE_LIBUNWIND
1203 if (stack_trace_enabled) {
1204 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
1205 unwind_cache_invalidate(tcp);
1209 #if SUPPORTED_PERSONALITIES > 1
1210 update_personality(tcp, tcp->currpers);
1212 res = (get_regs_error ? -1 : get_syscall_result(tcp));
1213 if (filtered(tcp) || hide_log(tcp))
1216 if (syserror(tcp) && syscall_fault_injected(tcp))
1217 update_syscall_fault_exiting(tcp);
1220 count_syscall(tcp, &tv);
1221 if (cflag == CFLAG_ONLY_STATS) {
1226 /* If not in -ff mode, and printing_tcp != tcp,
1227 * then the log currently does not end with output
1228 * of _our syscall entry_, but with something else.
1229 * We need to say which syscall's return is this.
1231 * Forced reprinting via TCB_REPRINT is used only by
1232 * "strace -ff -oLOG test/threaded_execve" corner case.
1233 * It's the only case when -ff mode needs reprinting.
1235 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
1236 tcp->flags &= ~TCB_REPRINT;
1238 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
1242 tcp->s_prev_ent = NULL;
1244 /* There was error in one of prior ptrace ops */
1247 tprints("= ? <unavailable>\n");
1249 tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
1250 tcp->sys_func_rval = 0;
1251 free_tcb_priv_data(tcp);
1254 tcp->s_prev_ent = tcp->s_ent;
1257 if (tcp->qual_flg & QUAL_RAW) {
1258 /* sys_res = printargs(tcp); - but it's nop on sysexit */
1260 /* FIXME: not_failing_only (IOW, option -z) is broken:
1261 * failure of syscall is known only after syscall return.
1262 * Thus we end up with something like this on, say, ENOENT:
1263 * open("doesnt_exist", O_RDONLY <unfinished ...>
1264 * {next syscall decode}
1265 * whereas the intended result is that open(...) line
1266 * is not shown at all.
1268 if (not_failing_only && tcp->u_error)
1269 goto ret; /* ignore failed syscalls */
1270 if (tcp->sys_func_rval & RVAL_DECODED)
1271 sys_res = tcp->sys_func_rval;
1273 sys_res = tcp->s_ent->sys_func(tcp);
1278 u_error = tcp->u_error;
1280 if (tcp->qual_flg & QUAL_RAW) {
1282 tprintf("= -1 (errno %lu)", u_error);
1283 if (syscall_fault_injected(tcp))
1284 tprints(" (INJECTED)");
1286 tprintf("= %#lx", tcp->u_rval);
1289 else if (!(sys_res & RVAL_NONE) && u_error) {
1291 /* Blocked signals do not interrupt any syscalls.
1292 * In this case syscalls don't return ERESTARTfoo codes.
1294 * Deadly signals set to SIG_DFL interrupt syscalls
1295 * and kill the process regardless of which of the codes below
1296 * is returned by the interrupted syscall.
1297 * In some cases, kernel forces a kernel-generated deadly
1298 * signal to be unblocked and set to SIG_DFL (and thus cause
1299 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
1300 * or SIGILL. (The alternative is to leave process spinning
1301 * forever on the faulty instruction - not useful).
1303 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
1304 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
1305 * but kernel will always restart them.
1308 /* Most common type of signal-interrupted syscall exit code.
1309 * The system call will be restarted with the same arguments
1310 * if SA_RESTART is set; otherwise, it will fail with EINTR.
1312 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
1314 case ERESTARTNOINTR:
1315 /* Rare. For example, fork() returns this if interrupted.
1316 * SA_RESTART is ignored (assumed set): the restart is unconditional.
1318 tprints("= ? ERESTARTNOINTR (To be restarted)");
1320 case ERESTARTNOHAND:
1321 /* pause(), rt_sigsuspend() etc use this code.
1322 * SA_RESTART is ignored (assumed not set):
1323 * syscall won't restart (will return EINTR instead)
1324 * even after signal with SA_RESTART set. However,
1325 * after SIG_IGN or SIG_DFL signal it will restart
1326 * (thus the name "restart only if has no handler").
1328 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
1330 case ERESTART_RESTARTBLOCK:
1331 /* Syscalls like nanosleep(), poll() which can't be
1332 * restarted with their original arguments use this
1333 * code. Kernel will execute restart_syscall() instead,
1334 * which changes arguments before restarting syscall.
1335 * SA_RESTART is ignored (assumed not set) similarly
1336 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1337 * since restart data is saved in "restart block"
1338 * in task struct, and if signal handler uses a syscall
1339 * which in turn saves another such restart block,
1340 * old data is lost and restart becomes impossible)
1342 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1345 u_error_str = err_name(u_error);
1347 tprintf("= -1 %s (%s)",
1348 u_error_str, strerror(u_error));
1350 tprintf("= -1 %lu (%s)",
1351 u_error, strerror(u_error));
1354 if (syscall_fault_injected(tcp))
1355 tprintf(" (INJECTED)");
1356 if ((sys_res & RVAL_STR) && tcp->auxstr)
1357 tprintf(" (%s)", tcp->auxstr);
1360 if (sys_res & RVAL_NONE)
1363 switch (sys_res & RVAL_MASK) {
1365 #if SUPPORTED_PERSONALITIES > 1
1366 if (current_wordsize < sizeof(long))
1368 (unsigned int) tcp->u_rval);
1371 tprintf("= %#lx", tcp->u_rval);
1375 print_numeric_long_umask(tcp->u_rval);
1378 #if SUPPORTED_PERSONALITIES > 1
1379 if (current_wordsize < sizeof(long))
1381 (unsigned int) tcp->u_rval);
1384 tprintf("= %lu", tcp->u_rval);
1387 tprintf("= %ld", tcp->u_rval);
1392 printfd(tcp, tcp->u_rval);
1395 tprintf("= %ld", tcp->u_rval);
1397 #if HAVE_STRUCT_TCB_EXT_ARG
1400 tprintf("= %#llx", tcp->u_lrval);
1403 tprintf("= %#llo", tcp->u_lrval);
1406 case RVAL_LUDECIMAL:
1407 tprintf("= %llu", tcp->u_lrval);
1411 tprintf("= %lld", tcp->u_lrval);
1414 #endif /* HAVE_STRUCT_TCB_EXT_ARG */
1416 error_msg("invalid rval format");
1420 if ((sys_res & RVAL_STR) && tcp->auxstr)
1421 tprintf(" (%s)", tcp->auxstr);
1424 tv_sub(&tv, &tv, &tcp->etime);
1425 tprintf(" <%ld.%06ld>",
1426 (long) tv.tv_sec, (long) tv.tv_usec);
1432 #ifdef USE_LIBUNWIND
1433 if (stack_trace_enabled)
1434 unwind_print_stacktrace(tcp);
1438 tcp->flags &= ~(TCB_INSYSCALL | TCB_FAULT_INJ);
1439 tcp->sys_func_rval = 0;
1440 free_tcb_priv_data(tcp);
1445 trace_syscall(struct tcb *tcp)
1447 return exiting(tcp) ?
1448 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1452 is_erestart(struct tcb *tcp)
1454 switch (tcp->u_error) {
1456 case ERESTARTNOINTR:
1457 case ERESTARTNOHAND:
1458 case ERESTART_RESTARTBLOCK:
1465 static unsigned long saved_u_error;
1468 temporarily_clear_syserror(struct tcb *tcp)
1470 saved_u_error = tcp->u_error;
1475 restore_cleared_syserror(struct tcb *tcp)
1477 tcp->u_error = saved_u_error;
1480 #include "kernel_types.h"
1483 * Check the syscall return value register value for whether it is
1484 * a negated errno code indicating an error, or a success return value.
1487 is_negated_errno(kernel_ulong_t val)
1489 /* Linux kernel defines MAX_ERRNO to 4095. */
1490 kernel_ulong_t max = -(kernel_long_t) 4095;
1492 #if defined X86_64 || defined X32
1494 * current_wordsize is 4 for x32 personality
1495 * but truncation _must not_ be done in it, so
1496 * check current_personality instead.
1498 if (current_personality == 1) {
1499 val = (uint32_t) val;
1500 max = (uint32_t) max;
1502 #elif SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1503 if (current_wordsize < sizeof(val)) {
1504 val = (uint32_t) val;
1505 max = (uint32_t) max;
1512 #include "arch_regs.c"
1514 #ifdef HAVE_GETRVAL2
1515 # include "arch_getrval2.c"
1519 print_pc(struct tcb *tcp)
1521 #if defined ARCH_PC_REG
1522 # define ARCH_GET_PC 0
1523 #elif defined ARCH_PC_PEEK_ADDR
1525 # define ARCH_PC_REG pc
1526 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1528 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1530 if (get_regs_error || ARCH_GET_PC)
1531 tprints(current_wordsize == 4 ? "[????????] "
1532 : "[????????????????] ");
1534 tprintf(current_wordsize == 4 ? "[%08lx] " : "[%016lx] ",
1535 (unsigned long) ARCH_PC_REG);
1538 #include "getregs_old.h"
1540 #undef ptrace_getregset_or_getregs
1541 #undef ptrace_setregset_or_setregs
1542 #ifdef ARCH_REGS_FOR_GETREGSET
1544 # define ptrace_getregset_or_getregs ptrace_getregset
1546 ptrace_getregset(pid_t pid)
1548 # ifdef ARCH_IOVEC_FOR_GETREGSET
1549 /* variable iovec */
1550 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1551 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1552 &ARCH_IOVEC_FOR_GETREGSET);
1554 /* constant iovec */
1555 static struct iovec io = {
1556 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1557 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1559 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1564 # ifndef HAVE_GETREGS_OLD
1565 # define ptrace_setregset_or_setregs ptrace_setregset
1567 ptrace_setregset(pid_t pid)
1569 # ifdef ARCH_IOVEC_FOR_GETREGSET
1570 /* variable iovec */
1571 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1572 &ARCH_IOVEC_FOR_GETREGSET);
1574 /* constant iovec */
1575 static struct iovec io = {
1576 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1577 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1579 return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1582 # endif /* !HAVE_GETREGS_OLD */
1584 #elif defined ARCH_REGS_FOR_GETREGS
1586 # define ptrace_getregset_or_getregs ptrace_getregs
1588 ptrace_getregs(pid_t pid)
1590 # if defined SPARC || defined SPARC64
1591 /* SPARC systems have the meaning of data and addr reversed */
1592 return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1594 return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1598 # ifndef HAVE_GETREGS_OLD
1599 # define ptrace_setregset_or_setregs ptrace_setregs
1601 ptrace_setregs(pid_t pid)
1603 # if defined SPARC || defined SPARC64
1604 /* SPARC systems have the meaning of data and addr reversed */
1605 return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1607 return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1610 # endif /* !HAVE_GETREGS_OLD */
1612 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1617 #undef USE_GET_SYSCALL_RESULT_REGS
1618 #ifdef ptrace_getregset_or_getregs
1620 # ifdef HAVE_GETREGS_OLD
1622 * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1623 * fallback to getregs_old.
1625 static int use_getregs_old;
1626 if (use_getregs_old < 0) {
1627 get_regs_error = ptrace_getregset_or_getregs(pid);
1629 } else if (use_getregs_old == 0) {
1630 get_regs_error = ptrace_getregset_or_getregs(pid);
1631 if (get_regs_error >= 0) {
1632 use_getregs_old = -1;
1635 if (errno == EPERM || errno == ESRCH)
1637 use_getregs_old = 1;
1639 get_regs_error = getregs_old(pid);
1640 # else /* !HAVE_GETREGS_OLD */
1641 /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1642 get_regs_error = ptrace_getregset_or_getregs(pid);
1643 # endif /* !HAVE_GETREGS_OLD */
1645 #else /* !ptrace_getregset_or_getregs */
1647 # define USE_GET_SYSCALL_RESULT_REGS 1
1648 # warning get_regs is not implemented for this architecture yet
1651 #endif /* !ptrace_getregset_or_getregs */
1654 #ifdef ptrace_setregset_or_setregs
1658 return ptrace_setregset_or_setregs(pid);
1660 #endif /* ptrace_setregset_or_setregs */
1665 char buf[sizeof("syscall_%lu") + sizeof(long) * 3];
1669 free_sysent_buf(void *ptr)
1671 struct sysent_buf *s = ptr;
1672 s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1678 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1679 * 1: ok, continue in trace_syscall_entering().
1680 * other: error, trace_syscall_entering() should print error indicator
1681 * ("????" etc) and bail out.
1684 get_scno(struct tcb *tcp)
1689 int rc = arch_get_scno(tcp);
1693 if (SCNO_IS_VALID(tcp->scno)) {
1694 tcp->s_ent = &sysent[tcp->scno];
1695 tcp->qual_flg = qual_flags[tcp->scno];
1697 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1700 s->ent.nargs = MAX_ARGS;
1701 s->ent.sen = SEN_printargs;
1702 s->ent.sys_func = printargs;
1703 s->ent.sys_name = s->buf;
1704 sprintf(s->buf, "syscall_%lu", shuffle_scno(tcp->scno));
1706 tcp->s_ent = &s->ent;
1707 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1709 set_tcb_priv_data(tcp, s, free_sysent_buf);
1712 error_msg("pid %d invalid syscall %ld", tcp->pid, tcp->scno);
1717 #ifdef USE_GET_SYSCALL_RESULT_REGS
1718 static int get_syscall_result_regs(struct tcb *);
1722 * 1: ok, continue in trace_syscall_exiting().
1723 * -1: error, trace_syscall_exiting() should print error indicator
1724 * ("????" etc) and bail out.
1727 get_syscall_result(struct tcb *tcp)
1729 #ifdef USE_GET_SYSCALL_RESULT_REGS
1730 if (get_syscall_result_regs(tcp))
1734 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1739 #include "get_scno.c"
1740 #include "set_scno.c"
1741 #include "get_syscall_args.c"
1742 #ifdef USE_GET_SYSCALL_RESULT_REGS
1743 # include "get_syscall_result.c"
1745 #include "get_error.c"
1746 #include "set_error.c"
1747 #ifdef HAVE_GETREGS_OLD
1748 # include "getregs_old.c"