granicus.if.org Git - strace/blob - syscall.c

   1 /*
   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>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  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.
  21  *
  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.
  32  */
  33
  34 #include "defs.h"
  35 #include <sys/param.h>
  36
  37 /* for struct iovec */
  38 #include <sys/uio.h>
  39
  40 #include "regs.h"
  41 #include "ptrace.h"
  42
  43 #if defined(SPARC64)
  44 # undef PTRACE_GETREGS
  45 # define PTRACE_GETREGS PTRACE_GETREGS64
  46 # undef PTRACE_SETREGS
  47 # define PTRACE_SETREGS PTRACE_SETREGS64
  48 #endif
  49
  50 #if defined SPARC64
  51 # include <asm/psrcompat.h>
  52 #elif defined SPARC
  53 # include <asm/psr.h>
  54 #endif
  55
  56 #ifdef IA64
  57 # include <asm/rse.h>
  58 #endif
  59
  60 #ifndef NT_PRSTATUS
  61 # define NT_PRSTATUS 1
  62 #endif
  63
  64 #ifndef NSIG
  65 # warning: NSIG is not defined, using 32
  66 # define NSIG 32
  67 #endif
  68
  69 #include "syscall.h"
  70
  71 /* Define these shorthand notations to simplify the syscallent files. */
  72 #define TD TRACE_DESC
  73 #define TF TRACE_FILE
  74 #define TI TRACE_IPC
  75 #define TN TRACE_NETWORK
  76 #define TP TRACE_PROCESS
  77 #define TS TRACE_SIGNAL
  78 #define TM TRACE_MEMORY
  79 #define NF SYSCALL_NEVER_FAILS
  80 #define MA MAX_ARGS
  81 #define SI STACKTRACE_INVALIDATE_CACHE
  82 #define SE STACKTRACE_CAPTURE_ON_ENTER
  83
  84 const struct_sysent sysent0[] = {
  85 #include "syscallent.h"
  86 };
  87
  88 #if SUPPORTED_PERSONALITIES > 1
  89 static const struct_sysent sysent1[] = {
  90 # include "syscallent1.h"
  91 };
  92 #endif
  93
  94 #if SUPPORTED_PERSONALITIES > 2
  95 static const struct_sysent sysent2[] = {
  96 # include "syscallent2.h"
  97 };
  98 #endif
  99
 100 /* Now undef them since short defines cause wicked namespace pollution. */
 101 #undef TD
 102 #undef TF
 103 #undef TI
 104 #undef TN
 105 #undef TP
 106 #undef TS
 107 #undef TM
 108 #undef NF
 109 #undef MA
 110 #undef SI
 111 #undef SE
 112
 113 /*
 114  * `ioctlent[012].h' files are automatically generated by the auxiliary
 115  * program `ioctlsort', such that the list is sorted by the `code' field.
 116  * This has the side-effect of resolving the _IO.. macros into
 117  * plain integers, eliminating the need to include here everything
 118  * in "/usr/include".
 119  */
 120
 121 const char *const errnoent0[] = {
 122 #include "errnoent.h"
 123 };
 124 const char *const signalent0[] = {
 125 #include "signalent.h"
 126 };
 127 const struct_ioctlent ioctlent0[] = {
 128 #include "ioctlent0.h"
 129 };
 130
 131 #if SUPPORTED_PERSONALITIES > 1
 132 static const char *const errnoent1[] = {
 133 # include "errnoent1.h"
 134 };
 135 static const char *const signalent1[] = {
 136 # include "signalent1.h"
 137 };
 138 static const struct_ioctlent ioctlent1[] = {
 139 # include "ioctlent1.h"
 140 };
 141 #endif
 142
 143 #if SUPPORTED_PERSONALITIES > 2
 144 static const char *const errnoent2[] = {
 145 # include "errnoent2.h"
 146 };
 147 static const char *const signalent2[] = {
 148 # include "signalent2.h"
 149 };
 150 static const struct_ioctlent ioctlent2[] = {
 151 # include "ioctlent2.h"
 152 };
 153 #endif
 154
 155 enum {
 156         nsyscalls0 = ARRAY_SIZE(sysent0)
 157 #if SUPPORTED_PERSONALITIES > 1
 158         , nsyscalls1 = ARRAY_SIZE(sysent1)
 159 # if SUPPORTED_PERSONALITIES > 2
 160         , nsyscalls2 = ARRAY_SIZE(sysent2)
 161 # endif
 162 #endif
 163 };
 164
 165 enum {
 166         nerrnos0 = ARRAY_SIZE(errnoent0)
 167 #if SUPPORTED_PERSONALITIES > 1
 168         , nerrnos1 = ARRAY_SIZE(errnoent1)
 169 # if SUPPORTED_PERSONALITIES > 2
 170         , nerrnos2 = ARRAY_SIZE(errnoent2)
 171 # endif
 172 #endif
 173 };
 174
 175 enum {
 176         nsignals0 = ARRAY_SIZE(signalent0)
 177 #if SUPPORTED_PERSONALITIES > 1
 178         , nsignals1 = ARRAY_SIZE(signalent1)
 179 # if SUPPORTED_PERSONALITIES > 2
 180         , nsignals2 = ARRAY_SIZE(signalent2)
 181 # endif
 182 #endif
 183 };
 184
 185 enum {
 186         nioctlents0 = ARRAY_SIZE(ioctlent0)
 187 #if SUPPORTED_PERSONALITIES > 1
 188         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 189 # if SUPPORTED_PERSONALITIES > 2
 190         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 191 # endif
 192 #endif
 193 };
 194
 195 #if SUPPORTED_PERSONALITIES > 1
 196 const struct_sysent *sysent = sysent0;
 197 const char *const *errnoent = errnoent0;
 198 const char *const *signalent = signalent0;
 199 const struct_ioctlent *ioctlent = ioctlent0;
 200 #endif
 201 unsigned nsyscalls = nsyscalls0;
 202 unsigned nerrnos = nerrnos0;
 203 unsigned nsignals = nsignals0;
 204 unsigned nioctlents = nioctlents0;
 205
 206 unsigned num_quals;
 207 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
 208
 209 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 210         nsyscalls0,
 211 #if SUPPORTED_PERSONALITIES > 1
 212         nsyscalls1,
 213 #endif
 214 #if SUPPORTED_PERSONALITIES > 2
 215         nsyscalls2,
 216 #endif
 217 };
 218 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 219         sysent0,
 220 #if SUPPORTED_PERSONALITIES > 1
 221         sysent1,
 222 #endif
 223 #if SUPPORTED_PERSONALITIES > 2
 224         sysent2,
 225 #endif
 226 };
 227
 228 enum {
 229         MAX_NSYSCALLS1 = (nsyscalls0
 230 #if SUPPORTED_PERSONALITIES > 1
 231                         > nsyscalls1 ? nsyscalls0 : nsyscalls1
 232 #endif
 233                         ),
 234         MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
 235 #if SUPPORTED_PERSONALITIES > 2
 236                         > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
 237 #endif
 238                         ),
 239         MAX_NSYSCALLS = MAX_NSYSCALLS2,
 240         /* We are ready for arches with up to 255 signals,
 241          * even though the largest known signo is on MIPS and it is 128.
 242          * The number of existing syscalls on all arches is
 243          * larger that 255 anyway, so it is just a pedantic matter.
 244          */
 245         MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
 246 };
 247
 248 #if SUPPORTED_PERSONALITIES > 1
 249 unsigned current_personality;
 250
 251 # ifndef current_wordsize
 252 unsigned current_wordsize;
 253 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 254         PERSONALITY0_WORDSIZE,
 255         PERSONALITY1_WORDSIZE,
 256 # if SUPPORTED_PERSONALITIES > 2
 257         PERSONALITY2_WORDSIZE,
 258 # endif
 259 };
 260 # endif
 261
 262 void
 263 set_personality(int personality)
 264 {
 265         nsyscalls = nsyscall_vec[personality];
 266         sysent = sysent_vec[personality];
 267
 268         switch (personality) {
 269         case 0:
 270                 errnoent = errnoent0;
 271                 nerrnos = nerrnos0;
 272                 ioctlent = ioctlent0;
 273                 nioctlents = nioctlents0;
 274                 signalent = signalent0;
 275                 nsignals = nsignals0;
 276                 break;
 277
 278         case 1:
 279                 errnoent = errnoent1;
 280                 nerrnos = nerrnos1;
 281                 ioctlent = ioctlent1;
 282                 nioctlents = nioctlents1;
 283                 signalent = signalent1;
 284                 nsignals = nsignals1;
 285                 break;
 286
 287 # if SUPPORTED_PERSONALITIES > 2
 288         case 2:
 289                 errnoent = errnoent2;
 290                 nerrnos = nerrnos2;
 291                 ioctlent = ioctlent2;
 292                 nioctlents = nioctlents2;
 293                 signalent = signalent2;
 294                 nsignals = nsignals2;
 295                 break;
 296 # endif
 297         }
 298
 299         current_personality = personality;
 300 # ifndef current_wordsize
 301         current_wordsize = personality_wordsize[personality];
 302 # endif
 303 }
 304
 305 static void
 306 update_personality(struct tcb *tcp, unsigned int personality)
 307 {
 308         if (personality == current_personality)
 309                 return;
 310         set_personality(personality);
 311
 312         if (personality == tcp->currpers)
 313                 return;
 314         tcp->currpers = personality;
 315
 316 # if defined(POWERPC64)
 317         if (!qflag) {
 318                 static const char *const names[] = {"64 bit", "32 bit"};
 319                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 320                         tcp->pid, names[personality]);
 321         }
 322 # elif defined(X86_64)
 323         if (!qflag) {
 324                 static const char *const names[] = {"64 bit", "32 bit", "x32"};
 325                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 326                         tcp->pid, names[personality]);
 327         }
 328 # elif defined(X32)
 329         if (!qflag) {
 330                 static const char *const names[] = {"x32", "32 bit"};
 331                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 332                         tcp->pid, names[personality]);
 333         }
 334 # elif defined(AARCH64)
 335         if (!qflag) {
 336                 static const char *const names[] = {"32-bit", "AArch64"};
 337                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 338                         tcp->pid, names[personality]);
 339         }
 340 # elif defined(TILE)
 341         if (!qflag) {
 342                 static const char *const names[] = {"64-bit", "32-bit"};
 343                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 344                         tcp->pid, names[personality]);
 345         }
 346 # endif
 347 }
 348 #endif
 349
 350 static int qual_syscall(), qual_signal(), qual_desc();
 351
 352 static const struct qual_options {
 353         unsigned int bitflag;
 354         const char *option_name;
 355         int (*qualify)(const char *, int, int);
 356         const char *argument_name;
 357 } qual_options[] = {
 358         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 359         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 360         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 361         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 362         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 363         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 364         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 365         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 366         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 367         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 368         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 369         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 370         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 371         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 372         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 373         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 374         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 375         { 0,            NULL,           NULL,           NULL            },
 376 };
 377
 378 static void
 379 reallocate_qual(const unsigned int n)
 380 {
 381         unsigned p;
 382         qualbits_t *qp;
 383         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 384                 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t));
 385                 if (!qp)
 386                         die_out_of_memory();
 387                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 388         }
 389         num_quals = n;
 390 }
 391
 392 static void
 393 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 394 {
 395         int p;
 396
 397         if (num_quals <= n)
 398                 reallocate_qual(n + 1);
 399
 400         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 401                 if (pers == p || pers < 0) {
 402                         if (not)
 403                                 qual_vec[p][n] &= ~bitflag;
 404                         else
 405                                 qual_vec[p][n] |= bitflag;
 406                 }
 407         }
 408 }
 409
 410 static int
 411 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 412 {
 413         int p;
 414         unsigned int i;
 415         int rc = -1;
 416
 417         if (*s >= '0' && *s <= '9') {
 418                 i = string_to_uint(s);
 419                 if (i >= MAX_NSYSCALLS)
 420                         return -1;
 421                 qualify_one(i, bitflag, not, -1);
 422                 return 0;
 423         }
 424
 425         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 426                 for (i = 0; i < nsyscall_vec[p]; i++) {
 427                         if (sysent_vec[p][i].sys_name
 428                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 429                         ) {
 430                                 qualify_one(i, bitflag, not, p);
 431                                 rc = 0;
 432                         }
 433                 }
 434         }
 435
 436         return rc;
 437 }
 438
 439 static int
 440 qual_signal(const char *s, const unsigned int bitflag, const int not)
 441 {
 442         unsigned int i;
 443
 444         if (*s >= '0' && *s <= '9') {
 445                 int signo = string_to_uint(s);
 446                 if (signo < 0 || signo > 255)
 447                         return -1;
 448                 qualify_one(signo, bitflag, not, -1);
 449                 return 0;
 450         }
 451         if (strncasecmp(s, "SIG", 3) == 0)
 452                 s += 3;
 453         for (i = 0; i <= NSIG; i++) {
 454                 if (strcasecmp(s, signame(i) + 3) == 0) {
 455                         qualify_one(i, bitflag, not, -1);
 456                         return 0;
 457                 }
 458         }
 459         return -1;
 460 }
 461
 462 static int
 463 qual_desc(const char *s, const unsigned int bitflag, const int not)
 464 {
 465         if (*s >= '0' && *s <= '9') {
 466                 int desc = string_to_uint(s);
 467                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 468                         return -1;
 469                 qualify_one(desc, bitflag, not, -1);
 470                 return 0;
 471         }
 472         return -1;
 473 }
 474
 475 static int
 476 lookup_class(const char *s)
 477 {
 478         if (strcmp(s, "file") == 0)
 479                 return TRACE_FILE;
 480         if (strcmp(s, "ipc") == 0)
 481                 return TRACE_IPC;
 482         if (strcmp(s, "network") == 0)
 483                 return TRACE_NETWORK;
 484         if (strcmp(s, "process") == 0)
 485                 return TRACE_PROCESS;
 486         if (strcmp(s, "signal") == 0)
 487                 return TRACE_SIGNAL;
 488         if (strcmp(s, "desc") == 0)
 489                 return TRACE_DESC;
 490         if (strcmp(s, "memory") == 0)
 491                 return TRACE_MEMORY;
 492         return -1;
 493 }
 494
 495 void
 496 qualify(const char *s)
 497 {
 498         const struct qual_options *opt;
 499         char *copy;
 500         const char *p;
 501         int not;
 502         unsigned int i;
 503
 504         if (num_quals == 0)
 505                 reallocate_qual(MIN_QUALS);
 506
 507         opt = &qual_options[0];
 508         for (i = 0; (p = qual_options[i].option_name); i++) {
 509                 unsigned int len = strlen(p);
 510                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 511                         opt = &qual_options[i];
 512                         s += len + 1;
 513                         break;
 514                 }
 515         }
 516         not = 0;
 517         if (*s == '!') {
 518                 not = 1;
 519                 s++;
 520         }
 521         if (strcmp(s, "none") == 0) {
 522                 not = 1 - not;
 523                 s = "all";
 524         }
 525         if (strcmp(s, "all") == 0) {
 526                 for (i = 0; i < num_quals; i++) {
 527                         qualify_one(i, opt->bitflag, not, -1);
 528                 }
 529                 return;
 530         }
 531         for (i = 0; i < num_quals; i++) {
 532                 qualify_one(i, opt->bitflag, !not, -1);
 533         }
 534         copy = strdup(s);
 535         if (!copy)
 536                 die_out_of_memory();
 537         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 538                 int n;
 539                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 540                         unsigned pers;
 541                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 542                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 543                                         if (sysent_vec[pers][i].sys_flags & n)
 544                                                 qualify_one(i, opt->bitflag, not, pers);
 545                         }
 546                         continue;
 547                 }
 548                 if (opt->qualify(p, opt->bitflag, not)) {
 549                         error_msg_and_die("invalid %s '%s'",
 550                                 opt->argument_name, p);
 551                 }
 552         }
 553         free(copy);
 554         return;
 555 }
 556
 557 #ifdef SYS_socket_subcall
 558 static void
 559 decode_socket_subcall(struct tcb *tcp)
 560 {
 561         unsigned long addr;
 562         unsigned int n;
 563
 564         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 565                 return;
 566
 567         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 568         tcp->qual_flg = qual_flags[tcp->scno];
 569         tcp->s_ent = &sysent[tcp->scno];
 570         addr = tcp->u_arg[1];
 571         n = tcp->s_ent->nargs;
 572         if (sizeof(tcp->u_arg[0]) == current_wordsize) {
 573                 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
 574                 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
 575         } else {
 576                 unsigned int args[n];
 577                 unsigned int i;
 578
 579                 memset(args, 0, sizeof(args));
 580                 (void) umove(tcp, addr, &args);
 581                 for (i = 0; i < n; ++i)
 582                         tcp->u_arg[i] = args[i];
 583         }
 584 }
 585 #endif
 586
 587 #ifdef SYS_ipc_subcall
 588 static void
 589 decode_ipc_subcall(struct tcb *tcp)
 590 {
 591         unsigned int i, n;
 592
 593         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 594                 return;
 595
 596         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 597         tcp->qual_flg = qual_flags[tcp->scno];
 598         tcp->s_ent = &sysent[tcp->scno];
 599         n = tcp->s_ent->nargs;
 600         for (i = 0; i < n; i++)
 601                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 602 }
 603 #endif
 604
 605 int
 606 printargs(struct tcb *tcp)
 607 {
 608         if (entering(tcp)) {
 609                 int i;
 610                 int n = tcp->s_ent->nargs;
 611                 for (i = 0; i < n; i++)
 612                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 613         }
 614         return 0;
 615 }
 616
 617 int
 618 printargs_lu(struct tcb *tcp)
 619 {
 620         if (entering(tcp)) {
 621                 int i;
 622                 int n = tcp->s_ent->nargs;
 623                 for (i = 0; i < n; i++)
 624                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 625         }
 626         return 0;
 627 }
 628
 629 int
 630 printargs_ld(struct tcb *tcp)
 631 {
 632         if (entering(tcp)) {
 633                 int i;
 634                 int n = tcp->s_ent->nargs;
 635                 for (i = 0; i < n; i++)
 636                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 637         }
 638         return 0;
 639 }
 640
 641 static void
 642 dumpio(struct tcb *tcp)
 643 {
 644         int (*func)();
 645
 646         if (syserror(tcp))
 647                 return;
 648         if ((unsigned long) tcp->u_arg[0] >= num_quals)
 649                 return;
 650         func = tcp->s_ent->sys_func;
 651         if (func == printargs)
 652                 return;
 653         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
 654                 if (func == sys_read ||
 655                     func == sys_pread ||
 656                     func == sys_recv ||
 657                     func == sys_recvfrom) {
 658                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 659                         return;
 660                 } else if (func == sys_readv) {
 661                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 662                         return;
 663 #if HAVE_SENDMSG
 664                 } else if (func == sys_recvmsg) {
 665                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 666                         return;
 667                 } else if (func == sys_recvmmsg) {
 668                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 669                         return;
 670 #endif
 671                 }
 672         }
 673         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
 674                 if (func == sys_write ||
 675                     func == sys_pwrite ||
 676                     func == sys_send ||
 677                     func == sys_sendto)
 678                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 679                 else if (func == sys_writev)
 680                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 681 #if HAVE_SENDMSG
 682                 else if (func == sys_sendmsg)
 683                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 684                 else if (func == sys_sendmmsg)
 685                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 686 #endif
 687         }
 688 }
 689
 690 /*
 691  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 692  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 693  */
 694 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 695 static long
 696 shuffle_scno(unsigned long scno)
 697 {
 698         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 699                 return scno;
 700
 701         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 702         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 703                 return 0x000ffff0;
 704         if (scno == 0x000ffff0)
 705                 return ARM_FIRST_SHUFFLED_SYSCALL;
 706
 707 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 708         /*
 709          * Is it ARM specific syscall?
 710          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 711          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 712          */
 713         if (scno >= 0x000f0000 &&
 714             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 715                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 716         }
 717         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 718                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 719         }
 720
 721         return scno;
 722 }
 723 #else
 724 # define shuffle_scno(scno) ((long)(scno))
 725 #endif
 726
 727 static char*
 728 undefined_scno_name(struct tcb *tcp)
 729 {
 730         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 731
 732         sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
 733         return buf;
 734 }
 735
 736 static long get_regs_error;
 737
 738 void
 739 clear_regs(void)
 740 {
 741         get_regs_error = -1;
 742 }
 743
 744 static int get_syscall_args(struct tcb *);
 745 static int get_syscall_result(struct tcb *);
 746
 747 static int
 748 trace_syscall_entering(struct tcb *tcp)
 749 {
 750         int res, scno_good;
 751
 752         scno_good = res = get_scno(tcp);
 753         if (res == 0)
 754                 return res;
 755         if (res == 1)
 756                 res = get_syscall_args(tcp);
 757
 758         if (res != 1) {
 759                 printleader(tcp);
 760                 if (scno_good != 1)
 761                         tprints("????" /* anti-trigraph gap */ "(");
 762                 else if (tcp->qual_flg & UNDEFINED_SCNO)
 763                         tprintf("%s(", undefined_scno_name(tcp));
 764                 else
 765                         tprintf("%s(", tcp->s_ent->sys_name);
 766                 /*
 767                  * " <unavailable>" will be added later by the code which
 768                  * detects ptrace errors.
 769                  */
 770                 goto ret;
 771         }
 772
 773         if (   sys_execve == tcp->s_ent->sys_func
 774 # if defined(SPARC) || defined(SPARC64)
 775             || sys_execv == tcp->s_ent->sys_func
 776 # endif
 777            ) {
 778                 hide_log_until_execve = 0;
 779         }
 780
 781 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 782         while (1) {
 783 # ifdef SYS_socket_subcall
 784                 if (tcp->s_ent->sys_func == sys_socketcall) {
 785                         decode_socket_subcall(tcp);
 786                         break;
 787                 }
 788 # endif
 789 # ifdef SYS_ipc_subcall
 790                 if (tcp->s_ent->sys_func == sys_ipc) {
 791                         decode_ipc_subcall(tcp);
 792                         break;
 793                 }
 794 # endif
 795                 break;
 796         }
 797 #endif
 798
 799         if (!(tcp->qual_flg & QUAL_TRACE)
 800          || (tracing_paths && !pathtrace_match(tcp))
 801         ) {
 802                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 803                 return 0;
 804         }
 805
 806         tcp->flags &= ~TCB_FILTERED;
 807
 808         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
 809                 res = 0;
 810                 goto ret;
 811         }
 812
 813 #ifdef USE_LIBUNWIND
 814         if (stack_trace_enabled) {
 815                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 816                         unwind_capture_stacktrace(tcp);
 817         }
 818 #endif
 819
 820         printleader(tcp);
 821         if (tcp->qual_flg & UNDEFINED_SCNO)
 822                 tprintf("%s(", undefined_scno_name(tcp));
 823         else
 824                 tprintf("%s(", tcp->s_ent->sys_name);
 825         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
 826                 res = printargs(tcp);
 827         else
 828                 res = tcp->s_ent->sys_func(tcp);
 829
 830         fflush(tcp->outf);
 831  ret:
 832         tcp->flags |= TCB_INSYSCALL;
 833         /* Measure the entrance time as late as possible to avoid errors. */
 834         if (Tflag || cflag)
 835                 gettimeofday(&tcp->etime, NULL);
 836         return res;
 837 }
 838
 839 static int
 840 trace_syscall_exiting(struct tcb *tcp)
 841 {
 842         int sys_res;
 843         struct timeval tv;
 844         int res;
 845         long u_error;
 846
 847         /* Measure the exit time as early as possible to avoid errors. */
 848         if (Tflag || cflag)
 849                 gettimeofday(&tv, NULL);
 850
 851 #ifdef USE_LIBUNWIND
 852         if (stack_trace_enabled) {
 853                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 854                         unwind_cache_invalidate(tcp);
 855         }
 856 #endif
 857
 858 #if SUPPORTED_PERSONALITIES > 1
 859         update_personality(tcp, tcp->currpers);
 860 #endif
 861         res = (get_regs_error ? -1 : get_syscall_result(tcp));
 862         if (res == 1) {
 863                 if (filtered(tcp) || hide_log_until_execve)
 864                         goto ret;
 865         }
 866
 867         if (cflag) {
 868                 count_syscall(tcp, &tv);
 869                 if (cflag == CFLAG_ONLY_STATS) {
 870                         goto ret;
 871                 }
 872         }
 873
 874         /* If not in -ff mode, and printing_tcp != tcp,
 875          * then the log currently does not end with output
 876          * of _our syscall entry_, but with something else.
 877          * We need to say which syscall's return is this.
 878          *
 879          * Forced reprinting via TCB_REPRINT is used only by
 880          * "strace -ff -oLOG test/threaded_execve" corner case.
 881          * It's the only case when -ff mode needs reprinting.
 882          */
 883         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 884                 tcp->flags &= ~TCB_REPRINT;
 885                 printleader(tcp);
 886                 if (tcp->qual_flg & UNDEFINED_SCNO)
 887                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
 888                 else
 889                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 890         }
 891         printing_tcp = tcp;
 892
 893         tcp->s_prev_ent = NULL;
 894         if (res != 1) {
 895                 /* There was error in one of prior ptrace ops */
 896                 tprints(") ");
 897                 tabto();
 898                 tprints("= ? <unavailable>\n");
 899                 line_ended();
 900                 tcp->flags &= ~TCB_INSYSCALL;
 901                 return res;
 902         }
 903         tcp->s_prev_ent = tcp->s_ent;
 904
 905         sys_res = 0;
 906         if (tcp->qual_flg & QUAL_RAW) {
 907                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 908         } else {
 909         /* FIXME: not_failing_only (IOW, option -z) is broken:
 910          * failure of syscall is known only after syscall return.
 911          * Thus we end up with something like this on, say, ENOENT:
 912          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 913          *     {next syscall decode}
 914          * whereas the intended result is that open(...) line
 915          * is not shown at all.
 916          */
 917                 if (not_failing_only && tcp->u_error)
 918                         goto ret;       /* ignore failed syscalls */
 919                 sys_res = tcp->s_ent->sys_func(tcp);
 920         }
 921
 922         tprints(") ");
 923         tabto();
 924         u_error = tcp->u_error;
 925         if (tcp->qual_flg & QUAL_RAW) {
 926                 if (u_error)
 927                         tprintf("= -1 (errno %ld)", u_error);
 928                 else
 929                         tprintf("= %#lx", tcp->u_rval);
 930         }
 931         else if (!(sys_res & RVAL_NONE) && u_error) {
 932                 switch (u_error) {
 933                 /* Blocked signals do not interrupt any syscalls.
 934                  * In this case syscalls don't return ERESTARTfoo codes.
 935                  *
 936                  * Deadly signals set to SIG_DFL interrupt syscalls
 937                  * and kill the process regardless of which of the codes below
 938                  * is returned by the interrupted syscall.
 939                  * In some cases, kernel forces a kernel-generated deadly
 940                  * signal to be unblocked and set to SIG_DFL (and thus cause
 941                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 942                  * or SIGILL. (The alternative is to leave process spinning
 943                  * forever on the faulty instruction - not useful).
 944                  *
 945                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 946                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 947                  * but kernel will always restart them.
 948                  */
 949                 case ERESTARTSYS:
 950                         /* Most common type of signal-interrupted syscall exit code.
 951                          * The system call will be restarted with the same arguments
 952                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 953                          */
 954                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 955                         break;
 956                 case ERESTARTNOINTR:
 957                         /* Rare. For example, fork() returns this if interrupted.
 958                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 959                          */
 960                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 961                         break;
 962                 case ERESTARTNOHAND:
 963                         /* pause(), rt_sigsuspend() etc use this code.
 964                          * SA_RESTART is ignored (assumed not set):
 965                          * syscall won't restart (will return EINTR instead)
 966                          * even after signal with SA_RESTART set. However,
 967                          * after SIG_IGN or SIG_DFL signal it will restart
 968                          * (thus the name "restart only if has no handler").
 969                          */
 970                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 971                         break;
 972                 case ERESTART_RESTARTBLOCK:
 973                         /* Syscalls like nanosleep(), poll() which can't be
 974                          * restarted with their original arguments use this
 975                          * code. Kernel will execute restart_syscall() instead,
 976                          * which changes arguments before restarting syscall.
 977                          * SA_RESTART is ignored (assumed not set) similarly
 978                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 979                          * since restart data is saved in "restart block"
 980                          * in task struct, and if signal handler uses a syscall
 981                          * which in turn saves another such restart block,
 982                          * old data is lost and restart becomes impossible)
 983                          */
 984                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 985                         break;
 986                 default:
 987                         if ((unsigned long) u_error < nerrnos
 988                             && errnoent[u_error])
 989                                 tprintf("= -1 %s (%s)", errnoent[u_error],
 990                                         strerror(u_error));
 991                         else
 992                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
 993                                         strerror(u_error));
 994                         break;
 995                 }
 996                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 997                         tprintf(" (%s)", tcp->auxstr);
 998         }
 999         else {
1000                 if (sys_res & RVAL_NONE)
1001                         tprints("= ?");
1002                 else {
1003                         switch (sys_res & RVAL_MASK) {
1004                         case RVAL_HEX:
1005 #if SUPPORTED_PERSONALITIES > 1
1006                                 if (current_wordsize < sizeof(long))
1007                                         tprintf("= %#x",
1008                                                 (unsigned int) tcp->u_rval);
1009                                 else
1010 #endif
1011                                         tprintf("= %#lx", tcp->u_rval);
1012                                 break;
1013                         case RVAL_OCTAL:
1014                                 tprintf("= %#lo", tcp->u_rval);
1015                                 break;
1016                         case RVAL_UDECIMAL:
1017                                 tprintf("= %lu", tcp->u_rval);
1018                                 break;
1019                         case RVAL_DECIMAL:
1020                                 tprintf("= %ld", tcp->u_rval);
1021                                 break;
1022                         case RVAL_FD:
1023                                 if (show_fd_path) {
1024                                         tprints("= ");
1025                                         printfd(tcp, tcp->u_rval);
1026                                 }
1027                                 else
1028                                         tprintf("= %ld", tcp->u_rval);
1029                                 break;
1030 #if defined(LINUX_MIPSN32) || defined(X32)
1031                         /*
1032                         case RVAL_LHEX:
1033                                 tprintf("= %#llx", tcp->u_lrval);
1034                                 break;
1035                         case RVAL_LOCTAL:
1036                                 tprintf("= %#llo", tcp->u_lrval);
1037                                 break;
1038                         */
1039                         case RVAL_LUDECIMAL:
1040                                 tprintf("= %llu", tcp->u_lrval);
1041                                 break;
1042                         /*
1043                         case RVAL_LDECIMAL:
1044                                 tprintf("= %lld", tcp->u_lrval);
1045                                 break;
1046                         */
1047 #endif
1048                         default:
1049                                 fprintf(stderr,
1050                                         "invalid rval format\n");
1051                                 break;
1052                         }
1053                 }
1054                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1055                         tprintf(" (%s)", tcp->auxstr);
1056         }
1057         if (Tflag) {
1058                 tv_sub(&tv, &tv, &tcp->etime);
1059                 tprintf(" <%ld.%06ld>",
1060                         (long) tv.tv_sec, (long) tv.tv_usec);
1061         }
1062         tprints("\n");
1063         dumpio(tcp);
1064         line_ended();
1065
1066 #ifdef USE_LIBUNWIND
1067         if (stack_trace_enabled)
1068                 unwind_print_stacktrace(tcp);
1069 #endif
1070
1071  ret:
1072         tcp->flags &= ~TCB_INSYSCALL;
1073         return 0;
1074 }
1075
1076 int
1077 trace_syscall(struct tcb *tcp)
1078 {
1079         return exiting(tcp) ?
1080                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1081 }
1082
1083 /*
1084  * Cannot rely on __kernel_[u]long_t being defined,
1085  * it is quite a recent feature of <asm/posix_types.h>.
1086  */
1087 #ifdef __kernel_long_t
1088 typedef __kernel_long_t kernel_long_t;
1089 typedef __kernel_ulong_t kernel_ulong_t;
1090 #else
1091 # ifdef X32
1092 typedef long long kernel_long_t;
1093 typedef unsigned long long kernel_ulong_t;
1094 # else
1095 typedef long kernel_long_t;
1096 typedef unsigned long kernel_ulong_t;
1097 # endif
1098 #endif
1099
1100 /*
1101  * Check the syscall return value register value for whether it is
1102  * a negated errno code indicating an error, or a success return value.
1103  */
1104 static inline bool
1105 is_negated_errno(kernel_ulong_t val)
1106 {
1107         /* Linux kernel defines MAX_ERRNO to 4095. */
1108         kernel_ulong_t max = -(kernel_long_t) 4095;
1109
1110 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1111         if (current_wordsize < sizeof(val)) {
1112                 val = (uint32_t) val;
1113                 max = (uint32_t) max;
1114         }
1115 #elif defined X32
1116         /*
1117          * current_wordsize is 4 even in personality 0 (native X32)
1118          * but truncation _must not_ be done in it.
1119          * can't check current_wordsize here!
1120          */
1121         if (current_personality != 0) {
1122                 val = (uint32_t) val;
1123                 max = (uint32_t) max;
1124         }
1125 #endif
1126
1127         return val >= max;
1128 }
1129
1130 #include "arch_regs.c"
1131
1132 #ifdef HAVE_GETRVAL2
1133 # include "arch_getrval2.c"
1134 #endif
1135
1136 void
1137 print_pc(struct tcb *tcp)
1138 {
1139         const char *fmt;
1140         const char *bad;
1141
1142 #ifdef current_wordsize
1143 # define pc_wordsize current_wordsize
1144 #else
1145 # define pc_wordsize personality_wordsize[tcp->currpers]
1146 #endif
1147
1148         if (pc_wordsize == 4) {
1149                 fmt = "[%08lx] ";
1150                 bad = "[????????] ";
1151         } else {
1152                 fmt = "[%016lx] ";
1153                 bad = "[????????????????] ";
1154         }
1155
1156 #undef pc_wordsize
1157 #define PRINTBADPC tprints(bad)
1158
1159         if (get_regs_error) {
1160                 PRINTBADPC;
1161                 return;
1162         }
1163
1164 #include "print_pc.c"
1165 }
1166
1167 #if defined X86_64 || defined POWERPC
1168 # include "getregs_old.c"
1169 #endif
1170
1171 #if defined ARCH_REGS_FOR_GETREGSET
1172 static long
1173 get_regset(pid_t pid)
1174 {
1175 # ifdef ARCH_IOVEC_FOR_GETREGSET
1176         /* variable iovec */
1177         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1178         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1179                       &ARCH_IOVEC_FOR_GETREGSET);
1180 # else
1181         /* constant iovec */
1182         static struct iovec io = {
1183                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1184                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1185         };
1186         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1187
1188 # endif
1189 }
1190 #endif /* ARCH_REGS_FOR_GETREGSET */
1191
1192 void
1193 get_regs(pid_t pid)
1194 {
1195 #ifdef ARCH_REGS_FOR_GETREGSET
1196 # ifdef X86_64
1197         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1198         static int getregset_support;
1199
1200         if (getregset_support >= 0) {
1201                 get_regs_error = get_regset(pid);
1202                 if (getregset_support > 0)
1203                         return;
1204                 if (get_regs_error >= 0) {
1205                         getregset_support = 1;
1206                         return;
1207                 }
1208                 if (errno == EPERM || errno == ESRCH)
1209                         return;
1210                 getregset_support = -1;
1211         }
1212         getregs_old(pid);
1213 # else /* !X86_64 */
1214         /* Assume that PTRACE_GETREGSET works. */
1215         get_regs_error = get_regset(pid);
1216 # endif
1217 #elif defined ARCH_REGS_FOR_GETREGS
1218 # if defined SPARC || defined SPARC64
1219         /* SPARC systems have the meaning of data and addr reversed */
1220         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1221 # elif defined POWERPC
1222         static bool old_kernel = 0;
1223         if (old_kernel)
1224                 goto old;
1225         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1226         if (get_regs_error && errno == EIO) {
1227                 old_kernel = 1;
1228  old:
1229                 get_regs_error = getregs_old(pid);
1230         }
1231 # else
1232         /* Assume that PTRACE_GETREGS works. */
1233         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1234 # endif
1235
1236 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1237 #  warning get_regs is not implemented for this architecture yet
1238         get_regs_error = 0;
1239 #endif
1240 }
1241
1242 /* Returns:
1243  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1244  * 1: ok, continue in trace_syscall_entering().
1245  * other: error, trace_syscall_entering() should print error indicator
1246  *    ("????" etc) and bail out.
1247  */
1248 int
1249 get_scno(struct tcb *tcp)
1250 {
1251         if (get_regs_error)
1252                 return -1;
1253
1254         long scno = 0;
1255
1256 #include "get_scno.c"
1257
1258         tcp->scno = scno;
1259         if (SCNO_IS_VALID(tcp->scno)) {
1260                 tcp->s_ent = &sysent[scno];
1261                 tcp->qual_flg = qual_flags[scno];
1262         } else {
1263                 static const struct_sysent unknown = {
1264                         .nargs = MAX_ARGS,
1265                         .sys_flags = 0,
1266                         .sys_func = printargs,
1267                         .sys_name = "unknown", /* not used */
1268                 };
1269                 tcp->s_ent = &unknown;
1270                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1271                 if (debug_flag)
1272                         fprintf(stderr, "pid %d invalid syscall %ld\n",
1273                                 tcp->pid, scno);
1274         }
1275         return 1;
1276 }
1277
1278 /* Return -1 on error or 1 on success (never 0!) */
1279 static int
1280 get_syscall_args(struct tcb *tcp)
1281 {
1282 #include "get_syscall_args.c"
1283         return 1;
1284 }
1285
1286 static void
1287 get_error(struct tcb *tcp)
1288 {
1289         const bool check_errno = !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS);
1290         tcp->u_error = 0;
1291
1292 #include "get_error.c"
1293 }
1294
1295 /* Returns:
1296  * 1: ok, continue in trace_syscall_exiting().
1297  * -1: error, trace_syscall_exiting() should print error indicator
1298  *    ("????" etc) and bail out.
1299  */
1300 static int
1301 get_syscall_result(struct tcb *tcp)
1302 {
1303 #if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS
1304         /* already done by get_regs */
1305 #else
1306 # include "get_syscall_result.c"
1307 #endif
1308         get_error(tcp);
1309         return 1;
1310 }