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 # undef PERSONALITY_NAMES
 317 # if defined POWERPC64
 318 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 319 # elif defined X86_64
 320 #  define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
 321 # elif defined X32
 322 #  define PERSONALITY_NAMES {"x32", "32 bit"}
 323 # elif defined AARCH64
 324 #  define PERSONALITY_NAMES {"32-bit", "AArch64"}
 325 # elif defined TILE
 326 #  define PERSONALITY_NAMES {"64-bit", "32-bit"}
 327 # endif
 328 # ifdef PERSONALITY_NAMES
 329         if (!qflag) {
 330                 static const char *const names[] = PERSONALITY_NAMES;
 331                 error_msg("[ Process PID=%d runs in %s mode. ]",
 332                           tcp->pid, names[personality]);
 333         }
 334 # endif
 335 }
 336 #endif
 337
 338 static int qual_syscall(), qual_signal(), qual_desc();
 339
 340 static const struct qual_options {
 341         unsigned int bitflag;
 342         const char *option_name;
 343         int (*qualify)(const char *, int, int);
 344         const char *argument_name;
 345 } qual_options[] = {
 346         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 347         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 348         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 349         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 350         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 351         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 352         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 353         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 354         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 355         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 356         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 357         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 358         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 359         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 360         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 361         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 362         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 363         { 0,            NULL,           NULL,           NULL            },
 364 };
 365
 366 static void
 367 reallocate_qual(const unsigned int n)
 368 {
 369         unsigned p;
 370         qualbits_t *qp;
 371         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 372                 qp = qual_vec[p] = xreallocarray(qual_vec[p], n,
 373                                                  sizeof(qualbits_t));
 374                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 375         }
 376         num_quals = n;
 377 }
 378
 379 static void
 380 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 381 {
 382         int p;
 383
 384         if (num_quals <= n)
 385                 reallocate_qual(n + 1);
 386
 387         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 388                 if (pers == p || pers < 0) {
 389                         if (not)
 390                                 qual_vec[p][n] &= ~bitflag;
 391                         else
 392                                 qual_vec[p][n] |= bitflag;
 393                 }
 394         }
 395 }
 396
 397 static int
 398 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 399 {
 400         int p;
 401         unsigned int i;
 402         int rc = -1;
 403
 404         if (*s >= '0' && *s <= '9') {
 405                 i = string_to_uint(s);
 406                 if (i >= MAX_NSYSCALLS)
 407                         return -1;
 408                 qualify_one(i, bitflag, not, -1);
 409                 return 0;
 410         }
 411
 412         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 413                 for (i = 0; i < nsyscall_vec[p]; i++) {
 414                         if (sysent_vec[p][i].sys_name
 415                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 416                         ) {
 417                                 qualify_one(i, bitflag, not, p);
 418                                 rc = 0;
 419                         }
 420                 }
 421         }
 422
 423         return rc;
 424 }
 425
 426 static int
 427 qual_signal(const char *s, const unsigned int bitflag, const int not)
 428 {
 429         unsigned int i;
 430
 431         if (*s >= '0' && *s <= '9') {
 432                 int signo = string_to_uint(s);
 433                 if (signo < 0 || signo > 255)
 434                         return -1;
 435                 qualify_one(signo, bitflag, not, -1);
 436                 return 0;
 437         }
 438         if (strncasecmp(s, "SIG", 3) == 0)
 439                 s += 3;
 440         for (i = 0; i <= NSIG; i++) {
 441                 if (strcasecmp(s, signame(i) + 3) == 0) {
 442                         qualify_one(i, bitflag, not, -1);
 443                         return 0;
 444                 }
 445         }
 446         return -1;
 447 }
 448
 449 static int
 450 qual_desc(const char *s, const unsigned int bitflag, const int not)
 451 {
 452         if (*s >= '0' && *s <= '9') {
 453                 int desc = string_to_uint(s);
 454                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 455                         return -1;
 456                 qualify_one(desc, bitflag, not, -1);
 457                 return 0;
 458         }
 459         return -1;
 460 }
 461
 462 static int
 463 lookup_class(const char *s)
 464 {
 465         if (strcmp(s, "file") == 0)
 466                 return TRACE_FILE;
 467         if (strcmp(s, "ipc") == 0)
 468                 return TRACE_IPC;
 469         if (strcmp(s, "network") == 0)
 470                 return TRACE_NETWORK;
 471         if (strcmp(s, "process") == 0)
 472                 return TRACE_PROCESS;
 473         if (strcmp(s, "signal") == 0)
 474                 return TRACE_SIGNAL;
 475         if (strcmp(s, "desc") == 0)
 476                 return TRACE_DESC;
 477         if (strcmp(s, "memory") == 0)
 478                 return TRACE_MEMORY;
 479         return -1;
 480 }
 481
 482 void
 483 qualify(const char *s)
 484 {
 485         const struct qual_options *opt;
 486         char *copy;
 487         const char *p;
 488         int not;
 489         unsigned int i;
 490
 491         if (num_quals == 0)
 492                 reallocate_qual(MIN_QUALS);
 493
 494         opt = &qual_options[0];
 495         for (i = 0; (p = qual_options[i].option_name); i++) {
 496                 unsigned int len = strlen(p);
 497                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 498                         opt = &qual_options[i];
 499                         s += len + 1;
 500                         break;
 501                 }
 502         }
 503         not = 0;
 504         if (*s == '!') {
 505                 not = 1;
 506                 s++;
 507         }
 508         if (strcmp(s, "none") == 0) {
 509                 not = 1 - not;
 510                 s = "all";
 511         }
 512         if (strcmp(s, "all") == 0) {
 513                 for (i = 0; i < num_quals; i++) {
 514                         qualify_one(i, opt->bitflag, not, -1);
 515                 }
 516                 return;
 517         }
 518         for (i = 0; i < num_quals; i++) {
 519                 qualify_one(i, opt->bitflag, !not, -1);
 520         }
 521         copy = xstrdup(s);
 522         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 523                 int n;
 524                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 525                         unsigned pers;
 526                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 527                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 528                                         if (sysent_vec[pers][i].sys_flags & n)
 529                                                 qualify_one(i, opt->bitflag, not, pers);
 530                         }
 531                         continue;
 532                 }
 533                 if (opt->qualify(p, opt->bitflag, not)) {
 534                         error_msg_and_die("invalid %s '%s'",
 535                                 opt->argument_name, p);
 536                 }
 537         }
 538         free(copy);
 539         return;
 540 }
 541
 542 #ifdef SYS_socket_subcall
 543 static void
 544 decode_socket_subcall(struct tcb *tcp)
 545 {
 546         unsigned long addr;
 547         unsigned int n;
 548
 549         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 550                 return;
 551
 552         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 553         tcp->qual_flg = qual_flags[tcp->scno];
 554         tcp->s_ent = &sysent[tcp->scno];
 555         addr = tcp->u_arg[1];
 556         n = tcp->s_ent->nargs;
 557         if (sizeof(tcp->u_arg[0]) == current_wordsize) {
 558                 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
 559                 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
 560         } else {
 561                 unsigned int args[n];
 562                 unsigned int i;
 563
 564                 memset(args, 0, sizeof(args));
 565                 (void) umove(tcp, addr, &args);
 566                 for (i = 0; i < n; ++i)
 567                         tcp->u_arg[i] = args[i];
 568         }
 569 }
 570 #endif
 571
 572 #ifdef SYS_ipc_subcall
 573 static void
 574 decode_ipc_subcall(struct tcb *tcp)
 575 {
 576         unsigned int i, n;
 577
 578         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 579                 return;
 580
 581         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 582         tcp->qual_flg = qual_flags[tcp->scno];
 583         tcp->s_ent = &sysent[tcp->scno];
 584         n = tcp->s_ent->nargs;
 585         for (i = 0; i < n; i++)
 586                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 587 }
 588 #endif
 589
 590 #ifdef LINUX_MIPSO32
 591 static void
 592 decode_mips_subcall(struct tcb *tcp)
 593 {
 594         if (!SCNO_IS_VALID(tcp->u_arg[0]))
 595                 return;
 596         tcp->scno = tcp->u_arg[0];
 597         tcp->qual_flg = qual_flags[tcp->scno];
 598         tcp->s_ent = &sysent[tcp->scno];
 599         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 600                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 601         /*
 602          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 603          * and sync_file_range) would require additional code,
 604          * see linux/mips/get_syscall_args.c
 605          */
 606 }
 607
 608 SYS_FUNC(syscall)
 609 {
 610         return printargs(tcp);
 611 }
 612 #endif
 613
 614 int
 615 printargs(struct tcb *tcp)
 616 {
 617         if (entering(tcp)) {
 618                 int i;
 619                 int n = tcp->s_ent->nargs;
 620                 for (i = 0; i < n; i++)
 621                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 622         }
 623         return 0;
 624 }
 625
 626 int
 627 printargs_lu(struct tcb *tcp)
 628 {
 629         if (entering(tcp)) {
 630                 int i;
 631                 int n = tcp->s_ent->nargs;
 632                 for (i = 0; i < n; i++)
 633                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 634         }
 635         return 0;
 636 }
 637
 638 int
 639 printargs_ld(struct tcb *tcp)
 640 {
 641         if (entering(tcp)) {
 642                 int i;
 643                 int n = tcp->s_ent->nargs;
 644                 for (i = 0; i < n; i++)
 645                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 646         }
 647         return 0;
 648 }
 649
 650 static void
 651 dumpio(struct tcb *tcp)
 652 {
 653         int (*func)();
 654
 655         if (syserror(tcp))
 656                 return;
 657         if ((unsigned long) tcp->u_arg[0] >= num_quals)
 658                 return;
 659         func = tcp->s_ent->sys_func;
 660         if (func == printargs)
 661                 return;
 662         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
 663                 if (func == sys_read ||
 664                     func == sys_pread ||
 665                     func == sys_recv ||
 666                     func == sys_recvfrom) {
 667                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 668                         return;
 669                 } else if (func == sys_readv) {
 670                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 671                         return;
 672 #if HAVE_SENDMSG
 673                 } else if (func == sys_recvmsg) {
 674                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 675                         return;
 676                 } else if (func == sys_recvmmsg) {
 677                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 678                         return;
 679 #endif
 680                 }
 681         }
 682         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
 683                 if (func == sys_write ||
 684                     func == sys_pwrite ||
 685                     func == sys_send ||
 686                     func == sys_sendto)
 687                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 688                 else if (func == sys_writev)
 689                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 690 #if HAVE_SENDMSG
 691                 else if (func == sys_sendmsg)
 692                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 693                 else if (func == sys_sendmmsg)
 694                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 695 #endif
 696         }
 697 }
 698
 699 /*
 700  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 701  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 702  */
 703 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 704 static long
 705 shuffle_scno(unsigned long scno)
 706 {
 707         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 708                 return scno;
 709
 710         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 711         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 712                 return 0x000ffff0;
 713         if (scno == 0x000ffff0)
 714                 return ARM_FIRST_SHUFFLED_SYSCALL;
 715
 716 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 717         /*
 718          * Is it ARM specific syscall?
 719          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 720          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 721          */
 722         if (scno >= 0x000f0000 &&
 723             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 724                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 725         }
 726         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 727                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 728         }
 729
 730         return scno;
 731 }
 732 #else
 733 # define shuffle_scno(scno) ((long)(scno))
 734 #endif
 735
 736 static char*
 737 undefined_scno_name(struct tcb *tcp)
 738 {
 739         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 740
 741         sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
 742         return buf;
 743 }
 744
 745 static long get_regs_error;
 746
 747 void
 748 clear_regs(void)
 749 {
 750         get_regs_error = -1;
 751 }
 752
 753 static int get_syscall_args(struct tcb *);
 754 static int get_syscall_result(struct tcb *);
 755
 756 static int
 757 trace_syscall_entering(struct tcb *tcp)
 758 {
 759         int res, scno_good;
 760
 761         scno_good = res = get_scno(tcp);
 762         if (res == 0)
 763                 return res;
 764         if (res == 1)
 765                 res = get_syscall_args(tcp);
 766
 767         if (res != 1) {
 768                 printleader(tcp);
 769                 if (scno_good != 1)
 770                         tprints("????" /* anti-trigraph gap */ "(");
 771                 else if (tcp->qual_flg & UNDEFINED_SCNO)
 772                         tprintf("%s(", undefined_scno_name(tcp));
 773                 else
 774                         tprintf("%s(", tcp->s_ent->sys_name);
 775                 /*
 776                  * " <unavailable>" will be added later by the code which
 777                  * detects ptrace errors.
 778                  */
 779                 goto ret;
 780         }
 781
 782 #ifdef LINUX_MIPSO32
 783         if (sys_syscall == tcp->s_ent->sys_func)
 784                 decode_mips_subcall(tcp);
 785 #endif
 786
 787         if (   sys_execve == tcp->s_ent->sys_func
 788 # if defined(SPARC) || defined(SPARC64)
 789             || sys_execv == tcp->s_ent->sys_func
 790 # endif
 791            ) {
 792                 hide_log_until_execve = 0;
 793         }
 794
 795 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 796         while (1) {
 797 # ifdef SYS_socket_subcall
 798                 if (tcp->s_ent->sys_func == sys_socketcall) {
 799                         decode_socket_subcall(tcp);
 800                         break;
 801                 }
 802 # endif
 803 # ifdef SYS_ipc_subcall
 804                 if (tcp->s_ent->sys_func == sys_ipc) {
 805                         decode_ipc_subcall(tcp);
 806                         break;
 807                 }
 808 # endif
 809                 break;
 810         }
 811 #endif
 812
 813         if (!(tcp->qual_flg & QUAL_TRACE)
 814          || (tracing_paths && !pathtrace_match(tcp))
 815         ) {
 816                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 817                 return 0;
 818         }
 819
 820         tcp->flags &= ~TCB_FILTERED;
 821
 822         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
 823                 res = 0;
 824                 goto ret;
 825         }
 826
 827 #ifdef USE_LIBUNWIND
 828         if (stack_trace_enabled) {
 829                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 830                         unwind_capture_stacktrace(tcp);
 831         }
 832 #endif
 833
 834         printleader(tcp);
 835         if (tcp->qual_flg & UNDEFINED_SCNO)
 836                 tprintf("%s(", undefined_scno_name(tcp));
 837         else
 838                 tprintf("%s(", tcp->s_ent->sys_name);
 839         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
 840                 res = printargs(tcp);
 841         else
 842                 res = tcp->s_ent->sys_func(tcp);
 843
 844         fflush(tcp->outf);
 845  ret:
 846         tcp->flags |= TCB_INSYSCALL;
 847         /* Measure the entrance time as late as possible to avoid errors. */
 848         if (Tflag || cflag)
 849                 gettimeofday(&tcp->etime, NULL);
 850         return res;
 851 }
 852
 853 static int
 854 trace_syscall_exiting(struct tcb *tcp)
 855 {
 856         int sys_res;
 857         struct timeval tv;
 858         int res;
 859         long u_error;
 860
 861         /* Measure the exit time as early as possible to avoid errors. */
 862         if (Tflag || cflag)
 863                 gettimeofday(&tv, NULL);
 864
 865 #ifdef USE_LIBUNWIND
 866         if (stack_trace_enabled) {
 867                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 868                         unwind_cache_invalidate(tcp);
 869         }
 870 #endif
 871
 872 #if SUPPORTED_PERSONALITIES > 1
 873         update_personality(tcp, tcp->currpers);
 874 #endif
 875         res = (get_regs_error ? -1 : get_syscall_result(tcp));
 876         if (res == 1) {
 877                 if (filtered(tcp) || hide_log_until_execve)
 878                         goto ret;
 879         }
 880
 881         if (cflag) {
 882                 count_syscall(tcp, &tv);
 883                 if (cflag == CFLAG_ONLY_STATS) {
 884                         goto ret;
 885                 }
 886         }
 887
 888         /* If not in -ff mode, and printing_tcp != tcp,
 889          * then the log currently does not end with output
 890          * of _our syscall entry_, but with something else.
 891          * We need to say which syscall's return is this.
 892          *
 893          * Forced reprinting via TCB_REPRINT is used only by
 894          * "strace -ff -oLOG test/threaded_execve" corner case.
 895          * It's the only case when -ff mode needs reprinting.
 896          */
 897         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 898                 tcp->flags &= ~TCB_REPRINT;
 899                 printleader(tcp);
 900                 if (tcp->qual_flg & UNDEFINED_SCNO)
 901                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
 902                 else
 903                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 904         }
 905         printing_tcp = tcp;
 906
 907         tcp->s_prev_ent = NULL;
 908         if (res != 1) {
 909                 /* There was error in one of prior ptrace ops */
 910                 tprints(") ");
 911                 tabto();
 912                 tprints("= ? <unavailable>\n");
 913                 line_ended();
 914                 tcp->flags &= ~TCB_INSYSCALL;
 915                 return res;
 916         }
 917         tcp->s_prev_ent = tcp->s_ent;
 918
 919         sys_res = 0;
 920         if (tcp->qual_flg & QUAL_RAW) {
 921                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 922         } else {
 923         /* FIXME: not_failing_only (IOW, option -z) is broken:
 924          * failure of syscall is known only after syscall return.
 925          * Thus we end up with something like this on, say, ENOENT:
 926          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 927          *     {next syscall decode}
 928          * whereas the intended result is that open(...) line
 929          * is not shown at all.
 930          */
 931                 if (not_failing_only && tcp->u_error)
 932                         goto ret;       /* ignore failed syscalls */
 933                 sys_res = tcp->s_ent->sys_func(tcp);
 934         }
 935
 936         tprints(") ");
 937         tabto();
 938         u_error = tcp->u_error;
 939         if (tcp->qual_flg & QUAL_RAW) {
 940                 if (u_error)
 941                         tprintf("= -1 (errno %ld)", u_error);
 942                 else
 943                         tprintf("= %#lx", tcp->u_rval);
 944         }
 945         else if (!(sys_res & RVAL_NONE) && u_error) {
 946                 switch (u_error) {
 947                 /* Blocked signals do not interrupt any syscalls.
 948                  * In this case syscalls don't return ERESTARTfoo codes.
 949                  *
 950                  * Deadly signals set to SIG_DFL interrupt syscalls
 951                  * and kill the process regardless of which of the codes below
 952                  * is returned by the interrupted syscall.
 953                  * In some cases, kernel forces a kernel-generated deadly
 954                  * signal to be unblocked and set to SIG_DFL (and thus cause
 955                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 956                  * or SIGILL. (The alternative is to leave process spinning
 957                  * forever on the faulty instruction - not useful).
 958                  *
 959                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 960                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 961                  * but kernel will always restart them.
 962                  */
 963                 case ERESTARTSYS:
 964                         /* Most common type of signal-interrupted syscall exit code.
 965                          * The system call will be restarted with the same arguments
 966                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 967                          */
 968                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 969                         break;
 970                 case ERESTARTNOINTR:
 971                         /* Rare. For example, fork() returns this if interrupted.
 972                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 973                          */
 974                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 975                         break;
 976                 case ERESTARTNOHAND:
 977                         /* pause(), rt_sigsuspend() etc use this code.
 978                          * SA_RESTART is ignored (assumed not set):
 979                          * syscall won't restart (will return EINTR instead)
 980                          * even after signal with SA_RESTART set. However,
 981                          * after SIG_IGN or SIG_DFL signal it will restart
 982                          * (thus the name "restart only if has no handler").
 983                          */
 984                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 985                         break;
 986                 case ERESTART_RESTARTBLOCK:
 987                         /* Syscalls like nanosleep(), poll() which can't be
 988                          * restarted with their original arguments use this
 989                          * code. Kernel will execute restart_syscall() instead,
 990                          * which changes arguments before restarting syscall.
 991                          * SA_RESTART is ignored (assumed not set) similarly
 992                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 993                          * since restart data is saved in "restart block"
 994                          * in task struct, and if signal handler uses a syscall
 995                          * which in turn saves another such restart block,
 996                          * old data is lost and restart becomes impossible)
 997                          */
 998                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 999                         break;
1000                 default:
1001                         if ((unsigned long) u_error < nerrnos
1002                             && errnoent[u_error])
1003                                 tprintf("= -1 %s (%s)", errnoent[u_error],
1004                                         strerror(u_error));
1005                         else
1006                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1007                                         strerror(u_error));
1008                         break;
1009                 }
1010                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1011                         tprintf(" (%s)", tcp->auxstr);
1012         }
1013         else {
1014                 if (sys_res & RVAL_NONE)
1015                         tprints("= ?");
1016                 else {
1017                         switch (sys_res & RVAL_MASK) {
1018                         case RVAL_HEX:
1019 #if SUPPORTED_PERSONALITIES > 1
1020                                 if (current_wordsize < sizeof(long))
1021                                         tprintf("= %#x",
1022                                                 (unsigned int) tcp->u_rval);
1023                                 else
1024 #endif
1025                                         tprintf("= %#lx", tcp->u_rval);
1026                                 break;
1027                         case RVAL_OCTAL:
1028                                 tprintf("= %#lo", tcp->u_rval);
1029                                 break;
1030                         case RVAL_UDECIMAL:
1031                                 tprintf("= %lu", tcp->u_rval);
1032                                 break;
1033                         case RVAL_DECIMAL:
1034                                 tprintf("= %ld", tcp->u_rval);
1035                                 break;
1036                         case RVAL_FD:
1037                                 if (show_fd_path) {
1038                                         tprints("= ");
1039                                         printfd(tcp, tcp->u_rval);
1040                                 }
1041                                 else
1042                                         tprintf("= %ld", tcp->u_rval);
1043                                 break;
1044 #if defined(LINUX_MIPSN32) || defined(X32)
1045                         /*
1046                         case RVAL_LHEX:
1047                                 tprintf("= %#llx", tcp->u_lrval);
1048                                 break;
1049                         case RVAL_LOCTAL:
1050                                 tprintf("= %#llo", tcp->u_lrval);
1051                                 break;
1052                         */
1053                         case RVAL_LUDECIMAL:
1054                                 tprintf("= %llu", tcp->u_lrval);
1055                                 break;
1056                         /*
1057                         case RVAL_LDECIMAL:
1058                                 tprintf("= %lld", tcp->u_lrval);
1059                                 break;
1060                         */
1061 #endif
1062                         default:
1063                                 error_msg("invalid rval format");
1064                                 break;
1065                         }
1066                 }
1067                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1068                         tprintf(" (%s)", tcp->auxstr);
1069         }
1070         if (Tflag) {
1071                 tv_sub(&tv, &tv, &tcp->etime);
1072                 tprintf(" <%ld.%06ld>",
1073                         (long) tv.tv_sec, (long) tv.tv_usec);
1074         }
1075         tprints("\n");
1076         dumpio(tcp);
1077         line_ended();
1078
1079 #ifdef USE_LIBUNWIND
1080         if (stack_trace_enabled)
1081                 unwind_print_stacktrace(tcp);
1082 #endif
1083
1084  ret:
1085         tcp->flags &= ~TCB_INSYSCALL;
1086         return 0;
1087 }
1088
1089 int
1090 trace_syscall(struct tcb *tcp)
1091 {
1092         return exiting(tcp) ?
1093                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1094 }
1095
1096 /*
1097  * Cannot rely on __kernel_[u]long_t being defined,
1098  * it is quite a recent feature of <asm/posix_types.h>.
1099  */
1100 #ifdef __kernel_long_t
1101 typedef __kernel_long_t kernel_long_t;
1102 typedef __kernel_ulong_t kernel_ulong_t;
1103 #else
1104 # ifdef X32
1105 typedef long long kernel_long_t;
1106 typedef unsigned long long kernel_ulong_t;
1107 # else
1108 typedef long kernel_long_t;
1109 typedef unsigned long kernel_ulong_t;
1110 # endif
1111 #endif
1112
1113 /*
1114  * Check the syscall return value register value for whether it is
1115  * a negated errno code indicating an error, or a success return value.
1116  */
1117 static inline bool
1118 is_negated_errno(kernel_ulong_t val)
1119 {
1120         /* Linux kernel defines MAX_ERRNO to 4095. */
1121         kernel_ulong_t max = -(kernel_long_t) 4095;
1122
1123 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1124         if (current_wordsize < sizeof(val)) {
1125                 val = (uint32_t) val;
1126                 max = (uint32_t) max;
1127         }
1128 #elif defined X32
1129         /*
1130          * current_wordsize is 4 even in personality 0 (native X32)
1131          * but truncation _must not_ be done in it.
1132          * can't check current_wordsize here!
1133          */
1134         if (current_personality != 0) {
1135                 val = (uint32_t) val;
1136                 max = (uint32_t) max;
1137         }
1138 #endif
1139
1140         return val >= max;
1141 }
1142
1143 #include "arch_regs.c"
1144
1145 #ifdef HAVE_GETRVAL2
1146 # include "arch_getrval2.c"
1147 #endif
1148
1149 void
1150 print_pc(struct tcb *tcp)
1151 {
1152         const char *fmt;
1153         const char *bad;
1154
1155 #ifdef current_wordsize
1156 # define pc_wordsize current_wordsize
1157 #else
1158 # define pc_wordsize personality_wordsize[tcp->currpers]
1159 #endif
1160
1161         if (pc_wordsize == 4) {
1162                 fmt = "[%08lx] ";
1163                 bad = "[????????] ";
1164         } else {
1165                 fmt = "[%016lx] ";
1166                 bad = "[????????????????] ";
1167         }
1168
1169 #undef pc_wordsize
1170 #define PRINTBADPC tprints(bad)
1171
1172         if (get_regs_error) {
1173                 PRINTBADPC;
1174                 return;
1175         }
1176
1177 #include "print_pc.c"
1178 }
1179
1180 #if defined X86_64 || defined POWERPC
1181 # include "getregs_old.c"
1182 #endif
1183
1184 #if defined ARCH_REGS_FOR_GETREGSET
1185 static long
1186 get_regset(pid_t pid)
1187 {
1188 # ifdef ARCH_IOVEC_FOR_GETREGSET
1189         /* variable iovec */
1190         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1191         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1192                       &ARCH_IOVEC_FOR_GETREGSET);
1193 # else
1194         /* constant iovec */
1195         static struct iovec io = {
1196                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1197                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1198         };
1199         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1200
1201 # endif
1202 }
1203 #endif /* ARCH_REGS_FOR_GETREGSET */
1204
1205 void
1206 get_regs(pid_t pid)
1207 {
1208 #ifdef ARCH_REGS_FOR_GETREGSET
1209 # ifdef X86_64
1210         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1211         static int getregset_support;
1212
1213         if (getregset_support >= 0) {
1214                 get_regs_error = get_regset(pid);
1215                 if (getregset_support > 0)
1216                         return;
1217                 if (get_regs_error >= 0) {
1218                         getregset_support = 1;
1219                         return;
1220                 }
1221                 if (errno == EPERM || errno == ESRCH)
1222                         return;
1223                 getregset_support = -1;
1224         }
1225         getregs_old(pid);
1226 # else /* !X86_64 */
1227         /* Assume that PTRACE_GETREGSET works. */
1228         get_regs_error = get_regset(pid);
1229 # endif
1230 #elif defined ARCH_REGS_FOR_GETREGS
1231 # if defined SPARC || defined SPARC64
1232         /* SPARC systems have the meaning of data and addr reversed */
1233         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1234 # elif defined POWERPC
1235         static bool old_kernel = 0;
1236         if (old_kernel)
1237                 goto old;
1238         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1239         if (get_regs_error && errno == EIO) {
1240                 old_kernel = 1;
1241  old:
1242                 get_regs_error = getregs_old(pid);
1243         }
1244 # else
1245         /* Assume that PTRACE_GETREGS works. */
1246         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1247 # endif
1248
1249 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1250 #  warning get_regs is not implemented for this architecture yet
1251         get_regs_error = 0;
1252 #endif
1253 }
1254
1255 /* Returns:
1256  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1257  * 1: ok, continue in trace_syscall_entering().
1258  * other: error, trace_syscall_entering() should print error indicator
1259  *    ("????" etc) and bail out.
1260  */
1261 int
1262 get_scno(struct tcb *tcp)
1263 {
1264         if (get_regs_error)
1265                 return -1;
1266
1267         long scno = 0;
1268
1269 #include "get_scno.c"
1270
1271         tcp->scno = scno;
1272         if (SCNO_IS_VALID(tcp->scno)) {
1273                 tcp->s_ent = &sysent[scno];
1274                 tcp->qual_flg = qual_flags[scno];
1275         } else {
1276                 static const struct_sysent unknown = {
1277                         .nargs = MAX_ARGS,
1278                         .sys_flags = 0,
1279                         .sys_func = printargs,
1280                         .sys_name = "system call",
1281                 };
1282                 tcp->s_ent = &unknown;
1283                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1284                 if (debug_flag)
1285                         error_msg("pid %d invalid syscall %ld", tcp->pid, scno);
1286         }
1287         return 1;
1288 }
1289
1290 /* Return -1 on error or 1 on success (never 0!) */
1291 static int
1292 get_syscall_args(struct tcb *tcp)
1293 {
1294 #include "get_syscall_args.c"
1295         return 1;
1296 }
1297
1298 static void
1299 get_error(struct tcb *tcp)
1300 {
1301         const bool check_errno = !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS);
1302         tcp->u_error = 0;
1303
1304 #include "get_error.c"
1305 }
1306
1307 /* Returns:
1308  * 1: ok, continue in trace_syscall_exiting().
1309  * -1: error, trace_syscall_exiting() should print error indicator
1310  *    ("????" etc) and bail out.
1311  */
1312 static int
1313 get_syscall_result(struct tcb *tcp)
1314 {
1315 #if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS
1316         /* already done by get_regs */
1317 #else
1318 # include "get_syscall_result.c"
1319 #endif
1320         get_error(tcp);
1321         return 1;
1322 }