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] = xreallocarray(qual_vec[p], n,
 385                                                  sizeof(qualbits_t));
 386                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 387         }
 388         num_quals = n;
 389 }
 390
 391 static void
 392 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 393 {
 394         int p;
 395
 396         if (num_quals <= n)
 397                 reallocate_qual(n + 1);
 398
 399         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 400                 if (pers == p || pers < 0) {
 401                         if (not)
 402                                 qual_vec[p][n] &= ~bitflag;
 403                         else
 404                                 qual_vec[p][n] |= bitflag;
 405                 }
 406         }
 407 }
 408
 409 static int
 410 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 411 {
 412         int p;
 413         unsigned int i;
 414         int rc = -1;
 415
 416         if (*s >= '0' && *s <= '9') {
 417                 i = string_to_uint(s);
 418                 if (i >= MAX_NSYSCALLS)
 419                         return -1;
 420                 qualify_one(i, bitflag, not, -1);
 421                 return 0;
 422         }
 423
 424         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 425                 for (i = 0; i < nsyscall_vec[p]; i++) {
 426                         if (sysent_vec[p][i].sys_name
 427                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 428                         ) {
 429                                 qualify_one(i, bitflag, not, p);
 430                                 rc = 0;
 431                         }
 432                 }
 433         }
 434
 435         return rc;
 436 }
 437
 438 static int
 439 qual_signal(const char *s, const unsigned int bitflag, const int not)
 440 {
 441         unsigned int i;
 442
 443         if (*s >= '0' && *s <= '9') {
 444                 int signo = string_to_uint(s);
 445                 if (signo < 0 || signo > 255)
 446                         return -1;
 447                 qualify_one(signo, bitflag, not, -1);
 448                 return 0;
 449         }
 450         if (strncasecmp(s, "SIG", 3) == 0)
 451                 s += 3;
 452         for (i = 0; i <= NSIG; i++) {
 453                 if (strcasecmp(s, signame(i) + 3) == 0) {
 454                         qualify_one(i, bitflag, not, -1);
 455                         return 0;
 456                 }
 457         }
 458         return -1;
 459 }
 460
 461 static int
 462 qual_desc(const char *s, const unsigned int bitflag, const int not)
 463 {
 464         if (*s >= '0' && *s <= '9') {
 465                 int desc = string_to_uint(s);
 466                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 467                         return -1;
 468                 qualify_one(desc, bitflag, not, -1);
 469                 return 0;
 470         }
 471         return -1;
 472 }
 473
 474 static int
 475 lookup_class(const char *s)
 476 {
 477         if (strcmp(s, "file") == 0)
 478                 return TRACE_FILE;
 479         if (strcmp(s, "ipc") == 0)
 480                 return TRACE_IPC;
 481         if (strcmp(s, "network") == 0)
 482                 return TRACE_NETWORK;
 483         if (strcmp(s, "process") == 0)
 484                 return TRACE_PROCESS;
 485         if (strcmp(s, "signal") == 0)
 486                 return TRACE_SIGNAL;
 487         if (strcmp(s, "desc") == 0)
 488                 return TRACE_DESC;
 489         if (strcmp(s, "memory") == 0)
 490                 return TRACE_MEMORY;
 491         return -1;
 492 }
 493
 494 void
 495 qualify(const char *s)
 496 {
 497         const struct qual_options *opt;
 498         char *copy;
 499         const char *p;
 500         int not;
 501         unsigned int i;
 502
 503         if (num_quals == 0)
 504                 reallocate_qual(MIN_QUALS);
 505
 506         opt = &qual_options[0];
 507         for (i = 0; (p = qual_options[i].option_name); i++) {
 508                 unsigned int len = strlen(p);
 509                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 510                         opt = &qual_options[i];
 511                         s += len + 1;
 512                         break;
 513                 }
 514         }
 515         not = 0;
 516         if (*s == '!') {
 517                 not = 1;
 518                 s++;
 519         }
 520         if (strcmp(s, "none") == 0) {
 521                 not = 1 - not;
 522                 s = "all";
 523         }
 524         if (strcmp(s, "all") == 0) {
 525                 for (i = 0; i < num_quals; i++) {
 526                         qualify_one(i, opt->bitflag, not, -1);
 527                 }
 528                 return;
 529         }
 530         for (i = 0; i < num_quals; i++) {
 531                 qualify_one(i, opt->bitflag, !not, -1);
 532         }
 533         copy = xstrdup(s);
 534         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 535                 int n;
 536                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 537                         unsigned pers;
 538                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 539                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 540                                         if (sysent_vec[pers][i].sys_flags & n)
 541                                                 qualify_one(i, opt->bitflag, not, pers);
 542                         }
 543                         continue;
 544                 }
 545                 if (opt->qualify(p, opt->bitflag, not)) {
 546                         error_msg_and_die("invalid %s '%s'",
 547                                 opt->argument_name, p);
 548                 }
 549         }
 550         free(copy);
 551         return;
 552 }
 553
 554 #ifdef SYS_socket_subcall
 555 static void
 556 decode_socket_subcall(struct tcb *tcp)
 557 {
 558         unsigned long addr;
 559         unsigned int n;
 560
 561         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 562                 return;
 563
 564         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 565         tcp->qual_flg = qual_flags[tcp->scno];
 566         tcp->s_ent = &sysent[tcp->scno];
 567         addr = tcp->u_arg[1];
 568         n = tcp->s_ent->nargs;
 569         if (sizeof(tcp->u_arg[0]) == current_wordsize) {
 570                 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
 571                 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
 572         } else {
 573                 unsigned int args[n];
 574                 unsigned int i;
 575
 576                 memset(args, 0, sizeof(args));
 577                 (void) umove(tcp, addr, &args);
 578                 for (i = 0; i < n; ++i)
 579                         tcp->u_arg[i] = args[i];
 580         }
 581 }
 582 #endif
 583
 584 #ifdef SYS_ipc_subcall
 585 static void
 586 decode_ipc_subcall(struct tcb *tcp)
 587 {
 588         unsigned int i, n;
 589
 590         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 591                 return;
 592
 593         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 594         tcp->qual_flg = qual_flags[tcp->scno];
 595         tcp->s_ent = &sysent[tcp->scno];
 596         n = tcp->s_ent->nargs;
 597         for (i = 0; i < n; i++)
 598                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 599 }
 600 #endif
 601
 602 #ifdef LINUX_MIPSO32
 603 static void
 604 decode_mips_subcall(struct tcb *tcp)
 605 {
 606         if (!SCNO_IS_VALID(tcp->u_arg[0]))
 607                 return;
 608         tcp->scno = tcp->u_arg[0];
 609         tcp->qual_flg = qual_flags[tcp->scno];
 610         tcp->s_ent = &sysent[tcp->scno];
 611         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 612                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 613         /*
 614          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 615          * and sync_file_range) would require additional code,
 616          * see linux/mips/get_syscall_args.c
 617          */
 618 }
 619
 620 SYS_FUNC(syscall)
 621 {
 622         return printargs(tcp);
 623 }
 624 #endif
 625
 626 int
 627 printargs(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%#lx", i ? ", " : "", tcp->u_arg[i]);
 634         }
 635         return 0;
 636 }
 637
 638 int
 639 printargs_lu(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%lu", i ? ", " : "", tcp->u_arg[i]);
 646         }
 647         return 0;
 648 }
 649
 650 int
 651 printargs_ld(struct tcb *tcp)
 652 {
 653         if (entering(tcp)) {
 654                 int i;
 655                 int n = tcp->s_ent->nargs;
 656                 for (i = 0; i < n; i++)
 657                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 658         }
 659         return 0;
 660 }
 661
 662 static void
 663 dumpio(struct tcb *tcp)
 664 {
 665         int (*func)();
 666
 667         if (syserror(tcp))
 668                 return;
 669         if ((unsigned long) tcp->u_arg[0] >= num_quals)
 670                 return;
 671         func = tcp->s_ent->sys_func;
 672         if (func == printargs)
 673                 return;
 674         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
 675                 if (func == sys_read ||
 676                     func == sys_pread ||
 677                     func == sys_recv ||
 678                     func == sys_recvfrom) {
 679                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 680                         return;
 681                 } else if (func == sys_readv) {
 682                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 683                         return;
 684 #if HAVE_SENDMSG
 685                 } else if (func == sys_recvmsg) {
 686                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 687                         return;
 688                 } else if (func == sys_recvmmsg) {
 689                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 690                         return;
 691 #endif
 692                 }
 693         }
 694         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
 695                 if (func == sys_write ||
 696                     func == sys_pwrite ||
 697                     func == sys_send ||
 698                     func == sys_sendto)
 699                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 700                 else if (func == sys_writev)
 701                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 702 #if HAVE_SENDMSG
 703                 else if (func == sys_sendmsg)
 704                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 705                 else if (func == sys_sendmmsg)
 706                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 707 #endif
 708         }
 709 }
 710
 711 /*
 712  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 713  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 714  */
 715 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 716 static long
 717 shuffle_scno(unsigned long scno)
 718 {
 719         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 720                 return scno;
 721
 722         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 723         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 724                 return 0x000ffff0;
 725         if (scno == 0x000ffff0)
 726                 return ARM_FIRST_SHUFFLED_SYSCALL;
 727
 728 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 729         /*
 730          * Is it ARM specific syscall?
 731          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 732          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 733          */
 734         if (scno >= 0x000f0000 &&
 735             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 736                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 737         }
 738         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 739                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 740         }
 741
 742         return scno;
 743 }
 744 #else
 745 # define shuffle_scno(scno) ((long)(scno))
 746 #endif
 747
 748 static char*
 749 undefined_scno_name(struct tcb *tcp)
 750 {
 751         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 752
 753         sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
 754         return buf;
 755 }
 756
 757 static long get_regs_error;
 758
 759 void
 760 clear_regs(void)
 761 {
 762         get_regs_error = -1;
 763 }
 764
 765 static int get_syscall_args(struct tcb *);
 766 static int get_syscall_result(struct tcb *);
 767
 768 static int
 769 trace_syscall_entering(struct tcb *tcp)
 770 {
 771         int res, scno_good;
 772
 773         scno_good = res = get_scno(tcp);
 774         if (res == 0)
 775                 return res;
 776         if (res == 1)
 777                 res = get_syscall_args(tcp);
 778
 779         if (res != 1) {
 780                 printleader(tcp);
 781                 if (scno_good != 1)
 782                         tprints("????" /* anti-trigraph gap */ "(");
 783                 else if (tcp->qual_flg & UNDEFINED_SCNO)
 784                         tprintf("%s(", undefined_scno_name(tcp));
 785                 else
 786                         tprintf("%s(", tcp->s_ent->sys_name);
 787                 /*
 788                  * " <unavailable>" will be added later by the code which
 789                  * detects ptrace errors.
 790                  */
 791                 goto ret;
 792         }
 793
 794 #ifdef LINUX_MIPSO32
 795         if (sys_syscall == tcp->s_ent->sys_func)
 796                 decode_mips_subcall(tcp);
 797 #endif
 798
 799         if (   sys_execve == tcp->s_ent->sys_func
 800 # if defined(SPARC) || defined(SPARC64)
 801             || sys_execv == tcp->s_ent->sys_func
 802 # endif
 803            ) {
 804                 hide_log_until_execve = 0;
 805         }
 806
 807 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 808         while (1) {
 809 # ifdef SYS_socket_subcall
 810                 if (tcp->s_ent->sys_func == sys_socketcall) {
 811                         decode_socket_subcall(tcp);
 812                         break;
 813                 }
 814 # endif
 815 # ifdef SYS_ipc_subcall
 816                 if (tcp->s_ent->sys_func == sys_ipc) {
 817                         decode_ipc_subcall(tcp);
 818                         break;
 819                 }
 820 # endif
 821                 break;
 822         }
 823 #endif
 824
 825         if (!(tcp->qual_flg & QUAL_TRACE)
 826          || (tracing_paths && !pathtrace_match(tcp))
 827         ) {
 828                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 829                 return 0;
 830         }
 831
 832         tcp->flags &= ~TCB_FILTERED;
 833
 834         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
 835                 res = 0;
 836                 goto ret;
 837         }
 838
 839 #ifdef USE_LIBUNWIND
 840         if (stack_trace_enabled) {
 841                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 842                         unwind_capture_stacktrace(tcp);
 843         }
 844 #endif
 845
 846         printleader(tcp);
 847         if (tcp->qual_flg & UNDEFINED_SCNO)
 848                 tprintf("%s(", undefined_scno_name(tcp));
 849         else
 850                 tprintf("%s(", tcp->s_ent->sys_name);
 851         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
 852                 res = printargs(tcp);
 853         else
 854                 res = tcp->s_ent->sys_func(tcp);
 855
 856         fflush(tcp->outf);
 857  ret:
 858         tcp->flags |= TCB_INSYSCALL;
 859         /* Measure the entrance time as late as possible to avoid errors. */
 860         if (Tflag || cflag)
 861                 gettimeofday(&tcp->etime, NULL);
 862         return res;
 863 }
 864
 865 static int
 866 trace_syscall_exiting(struct tcb *tcp)
 867 {
 868         int sys_res;
 869         struct timeval tv;
 870         int res;
 871         long u_error;
 872
 873         /* Measure the exit time as early as possible to avoid errors. */
 874         if (Tflag || cflag)
 875                 gettimeofday(&tv, NULL);
 876
 877 #ifdef USE_LIBUNWIND
 878         if (stack_trace_enabled) {
 879                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 880                         unwind_cache_invalidate(tcp);
 881         }
 882 #endif
 883
 884 #if SUPPORTED_PERSONALITIES > 1
 885         update_personality(tcp, tcp->currpers);
 886 #endif
 887         res = (get_regs_error ? -1 : get_syscall_result(tcp));
 888         if (res == 1) {
 889                 if (filtered(tcp) || hide_log_until_execve)
 890                         goto ret;
 891         }
 892
 893         if (cflag) {
 894                 count_syscall(tcp, &tv);
 895                 if (cflag == CFLAG_ONLY_STATS) {
 896                         goto ret;
 897                 }
 898         }
 899
 900         /* If not in -ff mode, and printing_tcp != tcp,
 901          * then the log currently does not end with output
 902          * of _our syscall entry_, but with something else.
 903          * We need to say which syscall's return is this.
 904          *
 905          * Forced reprinting via TCB_REPRINT is used only by
 906          * "strace -ff -oLOG test/threaded_execve" corner case.
 907          * It's the only case when -ff mode needs reprinting.
 908          */
 909         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 910                 tcp->flags &= ~TCB_REPRINT;
 911                 printleader(tcp);
 912                 if (tcp->qual_flg & UNDEFINED_SCNO)
 913                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
 914                 else
 915                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 916         }
 917         printing_tcp = tcp;
 918
 919         tcp->s_prev_ent = NULL;
 920         if (res != 1) {
 921                 /* There was error in one of prior ptrace ops */
 922                 tprints(") ");
 923                 tabto();
 924                 tprints("= ? <unavailable>\n");
 925                 line_ended();
 926                 tcp->flags &= ~TCB_INSYSCALL;
 927                 return res;
 928         }
 929         tcp->s_prev_ent = tcp->s_ent;
 930
 931         sys_res = 0;
 932         if (tcp->qual_flg & QUAL_RAW) {
 933                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 934         } else {
 935         /* FIXME: not_failing_only (IOW, option -z) is broken:
 936          * failure of syscall is known only after syscall return.
 937          * Thus we end up with something like this on, say, ENOENT:
 938          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 939          *     {next syscall decode}
 940          * whereas the intended result is that open(...) line
 941          * is not shown at all.
 942          */
 943                 if (not_failing_only && tcp->u_error)
 944                         goto ret;       /* ignore failed syscalls */
 945                 sys_res = tcp->s_ent->sys_func(tcp);
 946         }
 947
 948         tprints(") ");
 949         tabto();
 950         u_error = tcp->u_error;
 951         if (tcp->qual_flg & QUAL_RAW) {
 952                 if (u_error)
 953                         tprintf("= -1 (errno %ld)", u_error);
 954                 else
 955                         tprintf("= %#lx", tcp->u_rval);
 956         }
 957         else if (!(sys_res & RVAL_NONE) && u_error) {
 958                 switch (u_error) {
 959                 /* Blocked signals do not interrupt any syscalls.
 960                  * In this case syscalls don't return ERESTARTfoo codes.
 961                  *
 962                  * Deadly signals set to SIG_DFL interrupt syscalls
 963                  * and kill the process regardless of which of the codes below
 964                  * is returned by the interrupted syscall.
 965                  * In some cases, kernel forces a kernel-generated deadly
 966                  * signal to be unblocked and set to SIG_DFL (and thus cause
 967                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 968                  * or SIGILL. (The alternative is to leave process spinning
 969                  * forever on the faulty instruction - not useful).
 970                  *
 971                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 972                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 973                  * but kernel will always restart them.
 974                  */
 975                 case ERESTARTSYS:
 976                         /* Most common type of signal-interrupted syscall exit code.
 977                          * The system call will be restarted with the same arguments
 978                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 979                          */
 980                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 981                         break;
 982                 case ERESTARTNOINTR:
 983                         /* Rare. For example, fork() returns this if interrupted.
 984                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 985                          */
 986                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 987                         break;
 988                 case ERESTARTNOHAND:
 989                         /* pause(), rt_sigsuspend() etc use this code.
 990                          * SA_RESTART is ignored (assumed not set):
 991                          * syscall won't restart (will return EINTR instead)
 992                          * even after signal with SA_RESTART set. However,
 993                          * after SIG_IGN or SIG_DFL signal it will restart
 994                          * (thus the name "restart only if has no handler").
 995                          */
 996                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 997                         break;
 998                 case ERESTART_RESTARTBLOCK:
 999                         /* Syscalls like nanosleep(), poll() which can't be
1000                          * restarted with their original arguments use this
1001                          * code. Kernel will execute restart_syscall() instead,
1002                          * which changes arguments before restarting syscall.
1003                          * SA_RESTART is ignored (assumed not set) similarly
1004                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1005                          * since restart data is saved in "restart block"
1006                          * in task struct, and if signal handler uses a syscall
1007                          * which in turn saves another such restart block,
1008                          * old data is lost and restart becomes impossible)
1009                          */
1010                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1011                         break;
1012                 default:
1013                         if ((unsigned long) u_error < nerrnos
1014                             && errnoent[u_error])
1015                                 tprintf("= -1 %s (%s)", errnoent[u_error],
1016                                         strerror(u_error));
1017                         else
1018                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1019                                         strerror(u_error));
1020                         break;
1021                 }
1022                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1023                         tprintf(" (%s)", tcp->auxstr);
1024         }
1025         else {
1026                 if (sys_res & RVAL_NONE)
1027                         tprints("= ?");
1028                 else {
1029                         switch (sys_res & RVAL_MASK) {
1030                         case RVAL_HEX:
1031 #if SUPPORTED_PERSONALITIES > 1
1032                                 if (current_wordsize < sizeof(long))
1033                                         tprintf("= %#x",
1034                                                 (unsigned int) tcp->u_rval);
1035                                 else
1036 #endif
1037                                         tprintf("= %#lx", tcp->u_rval);
1038                                 break;
1039                         case RVAL_OCTAL:
1040                                 tprintf("= %#lo", tcp->u_rval);
1041                                 break;
1042                         case RVAL_UDECIMAL:
1043                                 tprintf("= %lu", tcp->u_rval);
1044                                 break;
1045                         case RVAL_DECIMAL:
1046                                 tprintf("= %ld", tcp->u_rval);
1047                                 break;
1048                         case RVAL_FD:
1049                                 if (show_fd_path) {
1050                                         tprints("= ");
1051                                         printfd(tcp, tcp->u_rval);
1052                                 }
1053                                 else
1054                                         tprintf("= %ld", tcp->u_rval);
1055                                 break;
1056 #if defined(LINUX_MIPSN32) || defined(X32)
1057                         /*
1058                         case RVAL_LHEX:
1059                                 tprintf("= %#llx", tcp->u_lrval);
1060                                 break;
1061                         case RVAL_LOCTAL:
1062                                 tprintf("= %#llo", tcp->u_lrval);
1063                                 break;
1064                         */
1065                         case RVAL_LUDECIMAL:
1066                                 tprintf("= %llu", tcp->u_lrval);
1067                                 break;
1068                         /*
1069                         case RVAL_LDECIMAL:
1070                                 tprintf("= %lld", tcp->u_lrval);
1071                                 break;
1072                         */
1073 #endif
1074                         default:
1075                                 fprintf(stderr,
1076                                         "invalid rval format\n");
1077                                 break;
1078                         }
1079                 }
1080                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1081                         tprintf(" (%s)", tcp->auxstr);
1082         }
1083         if (Tflag) {
1084                 tv_sub(&tv, &tv, &tcp->etime);
1085                 tprintf(" <%ld.%06ld>",
1086                         (long) tv.tv_sec, (long) tv.tv_usec);
1087         }
1088         tprints("\n");
1089         dumpio(tcp);
1090         line_ended();
1091
1092 #ifdef USE_LIBUNWIND
1093         if (stack_trace_enabled)
1094                 unwind_print_stacktrace(tcp);
1095 #endif
1096
1097  ret:
1098         tcp->flags &= ~TCB_INSYSCALL;
1099         return 0;
1100 }
1101
1102 int
1103 trace_syscall(struct tcb *tcp)
1104 {
1105         return exiting(tcp) ?
1106                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1107 }
1108
1109 /*
1110  * Cannot rely on __kernel_[u]long_t being defined,
1111  * it is quite a recent feature of <asm/posix_types.h>.
1112  */
1113 #ifdef __kernel_long_t
1114 typedef __kernel_long_t kernel_long_t;
1115 typedef __kernel_ulong_t kernel_ulong_t;
1116 #else
1117 # ifdef X32
1118 typedef long long kernel_long_t;
1119 typedef unsigned long long kernel_ulong_t;
1120 # else
1121 typedef long kernel_long_t;
1122 typedef unsigned long kernel_ulong_t;
1123 # endif
1124 #endif
1125
1126 /*
1127  * Check the syscall return value register value for whether it is
1128  * a negated errno code indicating an error, or a success return value.
1129  */
1130 static inline bool
1131 is_negated_errno(kernel_ulong_t val)
1132 {
1133         /* Linux kernel defines MAX_ERRNO to 4095. */
1134         kernel_ulong_t max = -(kernel_long_t) 4095;
1135
1136 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1137         if (current_wordsize < sizeof(val)) {
1138                 val = (uint32_t) val;
1139                 max = (uint32_t) max;
1140         }
1141 #elif defined X32
1142         /*
1143          * current_wordsize is 4 even in personality 0 (native X32)
1144          * but truncation _must not_ be done in it.
1145          * can't check current_wordsize here!
1146          */
1147         if (current_personality != 0) {
1148                 val = (uint32_t) val;
1149                 max = (uint32_t) max;
1150         }
1151 #endif
1152
1153         return val >= max;
1154 }
1155
1156 #include "arch_regs.c"
1157
1158 #ifdef HAVE_GETRVAL2
1159 # include "arch_getrval2.c"
1160 #endif
1161
1162 void
1163 print_pc(struct tcb *tcp)
1164 {
1165         const char *fmt;
1166         const char *bad;
1167
1168 #ifdef current_wordsize
1169 # define pc_wordsize current_wordsize
1170 #else
1171 # define pc_wordsize personality_wordsize[tcp->currpers]
1172 #endif
1173
1174         if (pc_wordsize == 4) {
1175                 fmt = "[%08lx] ";
1176                 bad = "[????????] ";
1177         } else {
1178                 fmt = "[%016lx] ";
1179                 bad = "[????????????????] ";
1180         }
1181
1182 #undef pc_wordsize
1183 #define PRINTBADPC tprints(bad)
1184
1185         if (get_regs_error) {
1186                 PRINTBADPC;
1187                 return;
1188         }
1189
1190 #include "print_pc.c"
1191 }
1192
1193 #if defined X86_64 || defined POWERPC
1194 # include "getregs_old.c"
1195 #endif
1196
1197 #if defined ARCH_REGS_FOR_GETREGSET
1198 static long
1199 get_regset(pid_t pid)
1200 {
1201 # ifdef ARCH_IOVEC_FOR_GETREGSET
1202         /* variable iovec */
1203         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1204         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1205                       &ARCH_IOVEC_FOR_GETREGSET);
1206 # else
1207         /* constant iovec */
1208         static struct iovec io = {
1209                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1210                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1211         };
1212         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1213
1214 # endif
1215 }
1216 #endif /* ARCH_REGS_FOR_GETREGSET */
1217
1218 void
1219 get_regs(pid_t pid)
1220 {
1221 #ifdef ARCH_REGS_FOR_GETREGSET
1222 # ifdef X86_64
1223         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1224         static int getregset_support;
1225
1226         if (getregset_support >= 0) {
1227                 get_regs_error = get_regset(pid);
1228                 if (getregset_support > 0)
1229                         return;
1230                 if (get_regs_error >= 0) {
1231                         getregset_support = 1;
1232                         return;
1233                 }
1234                 if (errno == EPERM || errno == ESRCH)
1235                         return;
1236                 getregset_support = -1;
1237         }
1238         getregs_old(pid);
1239 # else /* !X86_64 */
1240         /* Assume that PTRACE_GETREGSET works. */
1241         get_regs_error = get_regset(pid);
1242 # endif
1243 #elif defined ARCH_REGS_FOR_GETREGS
1244 # if defined SPARC || defined SPARC64
1245         /* SPARC systems have the meaning of data and addr reversed */
1246         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1247 # elif defined POWERPC
1248         static bool old_kernel = 0;
1249         if (old_kernel)
1250                 goto old;
1251         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1252         if (get_regs_error && errno == EIO) {
1253                 old_kernel = 1;
1254  old:
1255                 get_regs_error = getregs_old(pid);
1256         }
1257 # else
1258         /* Assume that PTRACE_GETREGS works. */
1259         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1260 # endif
1261
1262 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1263 #  warning get_regs is not implemented for this architecture yet
1264         get_regs_error = 0;
1265 #endif
1266 }
1267
1268 /* Returns:
1269  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1270  * 1: ok, continue in trace_syscall_entering().
1271  * other: error, trace_syscall_entering() should print error indicator
1272  *    ("????" etc) and bail out.
1273  */
1274 int
1275 get_scno(struct tcb *tcp)
1276 {
1277         if (get_regs_error)
1278                 return -1;
1279
1280         long scno = 0;
1281
1282 #include "get_scno.c"
1283
1284         tcp->scno = scno;
1285         if (SCNO_IS_VALID(tcp->scno)) {
1286                 tcp->s_ent = &sysent[scno];
1287                 tcp->qual_flg = qual_flags[scno];
1288         } else {
1289                 static const struct_sysent unknown = {
1290                         .nargs = MAX_ARGS,
1291                         .sys_flags = 0,
1292                         .sys_func = printargs,
1293                         .sys_name = "system call",
1294                 };
1295                 tcp->s_ent = &unknown;
1296                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1297                 if (debug_flag)
1298                         fprintf(stderr, "pid %d invalid syscall %ld\n",
1299                                 tcp->pid, scno);
1300         }
1301         return 1;
1302 }
1303
1304 /* Return -1 on error or 1 on success (never 0!) */
1305 static int
1306 get_syscall_args(struct tcb *tcp)
1307 {
1308 #include "get_syscall_args.c"
1309         return 1;
1310 }
1311
1312 static void
1313 get_error(struct tcb *tcp)
1314 {
1315         const bool check_errno = !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS);
1316         tcp->u_error = 0;
1317
1318 #include "get_error.c"
1319 }
1320
1321 /* Returns:
1322  * 1: ok, continue in trace_syscall_exiting().
1323  * -1: error, trace_syscall_exiting() should print error indicator
1324  *    ("????" etc) and bail out.
1325  */
1326 static int
1327 get_syscall_result(struct tcb *tcp)
1328 {
1329 #if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS
1330         /* already done by get_regs */
1331 #else
1332 # include "get_syscall_result.c"
1333 #endif
1334         get_error(tcp);
1335         return 1;
1336 }