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 #define SEN_NAME(syscall_name) SEN_ ## syscall_name
  85 #define SEN(syscall_name) SEN_NAME(syscall_name), SYS_FUNC_NAME(syscall_name)
  86
  87 const struct_sysent sysent0[] = {
  88 #include "syscallent.h"
  89 };
  90
  91 #if SUPPORTED_PERSONALITIES > 1
  92 static const struct_sysent sysent1[] = {
  93 # include "syscallent1.h"
  94 };
  95 #endif
  96
  97 #if SUPPORTED_PERSONALITIES > 2
  98 static const struct_sysent sysent2[] = {
  99 # include "syscallent2.h"
 100 };
 101 #endif
 102
 103 /* Now undef them since short defines cause wicked namespace pollution. */
 104 #undef SEN
 105 #undef SEN_NAME
 106 #undef TD
 107 #undef TF
 108 #undef TI
 109 #undef TN
 110 #undef TP
 111 #undef TS
 112 #undef TM
 113 #undef NF
 114 #undef MA
 115 #undef SI
 116 #undef SE
 117
 118 /*
 119  * `ioctlent[012].h' files are automatically generated by the auxiliary
 120  * program `ioctlsort', such that the list is sorted by the `code' field.
 121  * This has the side-effect of resolving the _IO.. macros into
 122  * plain integers, eliminating the need to include here everything
 123  * in "/usr/include".
 124  */
 125
 126 const char *const errnoent0[] = {
 127 #include "errnoent.h"
 128 };
 129 const char *const signalent0[] = {
 130 #include "signalent.h"
 131 };
 132 const struct_ioctlent ioctlent0[] = {
 133 #include "ioctlent0.h"
 134 };
 135
 136 #if SUPPORTED_PERSONALITIES > 1
 137 static const char *const errnoent1[] = {
 138 # include "errnoent1.h"
 139 };
 140 static const char *const signalent1[] = {
 141 # include "signalent1.h"
 142 };
 143 static const struct_ioctlent ioctlent1[] = {
 144 # include "ioctlent1.h"
 145 };
 146 #endif
 147
 148 #if SUPPORTED_PERSONALITIES > 2
 149 static const char *const errnoent2[] = {
 150 # include "errnoent2.h"
 151 };
 152 static const char *const signalent2[] = {
 153 # include "signalent2.h"
 154 };
 155 static const struct_ioctlent ioctlent2[] = {
 156 # include "ioctlent2.h"
 157 };
 158 #endif
 159
 160 enum {
 161         nsyscalls0 = ARRAY_SIZE(sysent0)
 162 #if SUPPORTED_PERSONALITIES > 1
 163         , nsyscalls1 = ARRAY_SIZE(sysent1)
 164 # if SUPPORTED_PERSONALITIES > 2
 165         , nsyscalls2 = ARRAY_SIZE(sysent2)
 166 # endif
 167 #endif
 168 };
 169
 170 enum {
 171         nerrnos0 = ARRAY_SIZE(errnoent0)
 172 #if SUPPORTED_PERSONALITIES > 1
 173         , nerrnos1 = ARRAY_SIZE(errnoent1)
 174 # if SUPPORTED_PERSONALITIES > 2
 175         , nerrnos2 = ARRAY_SIZE(errnoent2)
 176 # endif
 177 #endif
 178 };
 179
 180 enum {
 181         nsignals0 = ARRAY_SIZE(signalent0)
 182 #if SUPPORTED_PERSONALITIES > 1
 183         , nsignals1 = ARRAY_SIZE(signalent1)
 184 # if SUPPORTED_PERSONALITIES > 2
 185         , nsignals2 = ARRAY_SIZE(signalent2)
 186 # endif
 187 #endif
 188 };
 189
 190 enum {
 191         nioctlents0 = ARRAY_SIZE(ioctlent0)
 192 #if SUPPORTED_PERSONALITIES > 1
 193         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 194 # if SUPPORTED_PERSONALITIES > 2
 195         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 196 # endif
 197 #endif
 198 };
 199
 200 #if SUPPORTED_PERSONALITIES > 1
 201 const struct_sysent *sysent = sysent0;
 202 const char *const *errnoent = errnoent0;
 203 const char *const *signalent = signalent0;
 204 const struct_ioctlent *ioctlent = ioctlent0;
 205 #endif
 206 unsigned nsyscalls = nsyscalls0;
 207 unsigned nerrnos = nerrnos0;
 208 unsigned nsignals = nsignals0;
 209 unsigned nioctlents = nioctlents0;
 210
 211 unsigned num_quals;
 212 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
 213
 214 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 215         nsyscalls0,
 216 #if SUPPORTED_PERSONALITIES > 1
 217         nsyscalls1,
 218 #endif
 219 #if SUPPORTED_PERSONALITIES > 2
 220         nsyscalls2,
 221 #endif
 222 };
 223 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 224         sysent0,
 225 #if SUPPORTED_PERSONALITIES > 1
 226         sysent1,
 227 #endif
 228 #if SUPPORTED_PERSONALITIES > 2
 229         sysent2,
 230 #endif
 231 };
 232
 233 enum {
 234         MAX_NSYSCALLS1 = (nsyscalls0
 235 #if SUPPORTED_PERSONALITIES > 1
 236                         > nsyscalls1 ? nsyscalls0 : nsyscalls1
 237 #endif
 238                         ),
 239         MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
 240 #if SUPPORTED_PERSONALITIES > 2
 241                         > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
 242 #endif
 243                         ),
 244         MAX_NSYSCALLS = MAX_NSYSCALLS2,
 245         /* We are ready for arches with up to 255 signals,
 246          * even though the largest known signo is on MIPS and it is 128.
 247          * The number of existing syscalls on all arches is
 248          * larger that 255 anyway, so it is just a pedantic matter.
 249          */
 250         MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
 251 };
 252
 253 #if SUPPORTED_PERSONALITIES > 1
 254 unsigned current_personality;
 255
 256 # ifndef current_wordsize
 257 unsigned current_wordsize;
 258 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 259         PERSONALITY0_WORDSIZE,
 260         PERSONALITY1_WORDSIZE,
 261 # if SUPPORTED_PERSONALITIES > 2
 262         PERSONALITY2_WORDSIZE,
 263 # endif
 264 };
 265 # endif
 266
 267 void
 268 set_personality(int personality)
 269 {
 270         nsyscalls = nsyscall_vec[personality];
 271         sysent = sysent_vec[personality];
 272
 273         switch (personality) {
 274         case 0:
 275                 errnoent = errnoent0;
 276                 nerrnos = nerrnos0;
 277                 ioctlent = ioctlent0;
 278                 nioctlents = nioctlents0;
 279                 signalent = signalent0;
 280                 nsignals = nsignals0;
 281                 break;
 282
 283         case 1:
 284                 errnoent = errnoent1;
 285                 nerrnos = nerrnos1;
 286                 ioctlent = ioctlent1;
 287                 nioctlents = nioctlents1;
 288                 signalent = signalent1;
 289                 nsignals = nsignals1;
 290                 break;
 291
 292 # if SUPPORTED_PERSONALITIES > 2
 293         case 2:
 294                 errnoent = errnoent2;
 295                 nerrnos = nerrnos2;
 296                 ioctlent = ioctlent2;
 297                 nioctlents = nioctlents2;
 298                 signalent = signalent2;
 299                 nsignals = nsignals2;
 300                 break;
 301 # endif
 302         }
 303
 304         current_personality = personality;
 305 # ifndef current_wordsize
 306         current_wordsize = personality_wordsize[personality];
 307 # endif
 308 }
 309
 310 static void
 311 update_personality(struct tcb *tcp, unsigned int personality)
 312 {
 313         if (personality == current_personality)
 314                 return;
 315         set_personality(personality);
 316
 317         if (personality == tcp->currpers)
 318                 return;
 319         tcp->currpers = personality;
 320
 321 # undef PERSONALITY_NAMES
 322 # if defined POWERPC64
 323 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 324 # elif defined X86_64
 325 #  define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
 326 # elif defined X32
 327 #  define PERSONALITY_NAMES {"x32", "32 bit"}
 328 # elif defined AARCH64
 329 #  define PERSONALITY_NAMES {"32-bit", "AArch64"}
 330 # elif defined TILE
 331 #  define PERSONALITY_NAMES {"64-bit", "32-bit"}
 332 # endif
 333 # ifdef PERSONALITY_NAMES
 334         if (!qflag) {
 335                 static const char *const names[] = PERSONALITY_NAMES;
 336                 error_msg("[ Process PID=%d runs in %s mode. ]",
 337                           tcp->pid, names[personality]);
 338         }
 339 # endif
 340 }
 341 #endif
 342
 343 static int qual_syscall(), qual_signal(), qual_desc();
 344
 345 static const struct qual_options {
 346         unsigned int bitflag;
 347         const char *option_name;
 348         int (*qualify)(const char *, int, int);
 349         const char *argument_name;
 350 } qual_options[] = {
 351         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 352         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 353         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 354         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 355         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 356         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 357         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 358         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 359         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 360         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 361         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 362         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 363         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 364         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 365         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 366         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 367         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 368         { 0,            NULL,           NULL,           NULL            },
 369 };
 370
 371 static void
 372 reallocate_qual(const unsigned int n)
 373 {
 374         unsigned p;
 375         qualbits_t *qp;
 376         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 377                 qp = qual_vec[p] = xreallocarray(qual_vec[p], n,
 378                                                  sizeof(qualbits_t));
 379                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 380         }
 381         num_quals = n;
 382 }
 383
 384 static void
 385 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 386 {
 387         int p;
 388
 389         if (num_quals <= n)
 390                 reallocate_qual(n + 1);
 391
 392         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 393                 if (pers == p || pers < 0) {
 394                         if (not)
 395                                 qual_vec[p][n] &= ~bitflag;
 396                         else
 397                                 qual_vec[p][n] |= bitflag;
 398                 }
 399         }
 400 }
 401
 402 static int
 403 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 404 {
 405         int p;
 406         unsigned int i;
 407         int rc = -1;
 408
 409         if (*s >= '0' && *s <= '9') {
 410                 i = string_to_uint(s);
 411                 if (i >= MAX_NSYSCALLS)
 412                         return -1;
 413                 qualify_one(i, bitflag, not, -1);
 414                 return 0;
 415         }
 416
 417         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 418                 for (i = 0; i < nsyscall_vec[p]; i++) {
 419                         if (sysent_vec[p][i].sys_name
 420                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 421                         ) {
 422                                 qualify_one(i, bitflag, not, p);
 423                                 rc = 0;
 424                         }
 425                 }
 426         }
 427
 428         return rc;
 429 }
 430
 431 static int
 432 qual_signal(const char *s, const unsigned int bitflag, const int not)
 433 {
 434         unsigned int i;
 435
 436         if (*s >= '0' && *s <= '9') {
 437                 int signo = string_to_uint(s);
 438                 if (signo < 0 || signo > 255)
 439                         return -1;
 440                 qualify_one(signo, bitflag, not, -1);
 441                 return 0;
 442         }
 443         if (strncasecmp(s, "SIG", 3) == 0)
 444                 s += 3;
 445         for (i = 0; i <= NSIG; i++) {
 446                 if (strcasecmp(s, signame(i) + 3) == 0) {
 447                         qualify_one(i, bitflag, not, -1);
 448                         return 0;
 449                 }
 450         }
 451         return -1;
 452 }
 453
 454 static int
 455 qual_desc(const char *s, const unsigned int bitflag, const int not)
 456 {
 457         if (*s >= '0' && *s <= '9') {
 458                 int desc = string_to_uint(s);
 459                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 460                         return -1;
 461                 qualify_one(desc, bitflag, not, -1);
 462                 return 0;
 463         }
 464         return -1;
 465 }
 466
 467 static int
 468 lookup_class(const char *s)
 469 {
 470         if (strcmp(s, "file") == 0)
 471                 return TRACE_FILE;
 472         if (strcmp(s, "ipc") == 0)
 473                 return TRACE_IPC;
 474         if (strcmp(s, "network") == 0)
 475                 return TRACE_NETWORK;
 476         if (strcmp(s, "process") == 0)
 477                 return TRACE_PROCESS;
 478         if (strcmp(s, "signal") == 0)
 479                 return TRACE_SIGNAL;
 480         if (strcmp(s, "desc") == 0)
 481                 return TRACE_DESC;
 482         if (strcmp(s, "memory") == 0)
 483                 return TRACE_MEMORY;
 484         return -1;
 485 }
 486
 487 void
 488 qualify(const char *s)
 489 {
 490         const struct qual_options *opt;
 491         char *copy;
 492         const char *p;
 493         int not;
 494         unsigned int i;
 495
 496         if (num_quals == 0)
 497                 reallocate_qual(MIN_QUALS);
 498
 499         opt = &qual_options[0];
 500         for (i = 0; (p = qual_options[i].option_name); i++) {
 501                 unsigned int len = strlen(p);
 502                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 503                         opt = &qual_options[i];
 504                         s += len + 1;
 505                         break;
 506                 }
 507         }
 508         not = 0;
 509         if (*s == '!') {
 510                 not = 1;
 511                 s++;
 512         }
 513         if (strcmp(s, "none") == 0) {
 514                 not = 1 - not;
 515                 s = "all";
 516         }
 517         if (strcmp(s, "all") == 0) {
 518                 for (i = 0; i < num_quals; i++) {
 519                         qualify_one(i, opt->bitflag, not, -1);
 520                 }
 521                 return;
 522         }
 523         for (i = 0; i < num_quals; i++) {
 524                 qualify_one(i, opt->bitflag, !not, -1);
 525         }
 526         copy = xstrdup(s);
 527         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 528                 int n;
 529                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 530                         unsigned pers;
 531                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 532                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 533                                         if (sysent_vec[pers][i].sys_flags & n)
 534                                                 qualify_one(i, opt->bitflag, not, pers);
 535                         }
 536                         continue;
 537                 }
 538                 if (opt->qualify(p, opt->bitflag, not)) {
 539                         error_msg_and_die("invalid %s '%s'",
 540                                 opt->argument_name, p);
 541                 }
 542         }
 543         free(copy);
 544         return;
 545 }
 546
 547 #ifdef SYS_socket_subcall
 548 static void
 549 decode_socket_subcall(struct tcb *tcp)
 550 {
 551         unsigned long addr;
 552         unsigned int n;
 553
 554         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 555                 return;
 556
 557         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 558         tcp->qual_flg = qual_flags[tcp->scno];
 559         tcp->s_ent = &sysent[tcp->scno];
 560         addr = tcp->u_arg[1];
 561         n = tcp->s_ent->nargs;
 562         if (sizeof(tcp->u_arg[0]) == current_wordsize) {
 563                 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
 564                 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
 565         } else {
 566                 unsigned int args[n];
 567                 unsigned int i;
 568
 569                 memset(args, 0, sizeof(args));
 570                 (void) umove(tcp, addr, &args);
 571                 for (i = 0; i < n; ++i)
 572                         tcp->u_arg[i] = args[i];
 573         }
 574 }
 575 #endif
 576
 577 #ifdef SYS_ipc_subcall
 578 static void
 579 decode_ipc_subcall(struct tcb *tcp)
 580 {
 581         unsigned int i, n;
 582
 583         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 584                 return;
 585
 586         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 587         tcp->qual_flg = qual_flags[tcp->scno];
 588         tcp->s_ent = &sysent[tcp->scno];
 589         n = tcp->s_ent->nargs;
 590         for (i = 0; i < n; i++)
 591                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 592 }
 593 #endif
 594
 595 #ifdef LINUX_MIPSO32
 596 static void
 597 decode_mips_subcall(struct tcb *tcp)
 598 {
 599         if (!SCNO_IS_VALID(tcp->u_arg[0]))
 600                 return;
 601         tcp->scno = tcp->u_arg[0];
 602         tcp->qual_flg = qual_flags[tcp->scno];
 603         tcp->s_ent = &sysent[tcp->scno];
 604         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 605                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 606         /*
 607          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 608          * and sync_file_range) would require additional code,
 609          * see linux/mips/get_syscall_args.c
 610          */
 611 }
 612
 613 SYS_FUNC(syscall)
 614 {
 615         return printargs(tcp);
 616 }
 617 #endif
 618
 619 int
 620 printargs(struct tcb *tcp)
 621 {
 622         if (entering(tcp)) {
 623                 int i;
 624                 int n = tcp->s_ent->nargs;
 625                 for (i = 0; i < n; i++)
 626                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 627         }
 628         return 0;
 629 }
 630
 631 int
 632 printargs_lu(struct tcb *tcp)
 633 {
 634         if (entering(tcp)) {
 635                 int i;
 636                 int n = tcp->s_ent->nargs;
 637                 for (i = 0; i < n; i++)
 638                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 639         }
 640         return 0;
 641 }
 642
 643 int
 644 printargs_ld(struct tcb *tcp)
 645 {
 646         if (entering(tcp)) {
 647                 int i;
 648                 int n = tcp->s_ent->nargs;
 649                 for (i = 0; i < n; i++)
 650                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 651         }
 652         return 0;
 653 }
 654
 655 static void
 656 dumpio(struct tcb *tcp)
 657 {
 658         int sen;
 659
 660         if (syserror(tcp))
 661                 return;
 662         if ((unsigned long) tcp->u_arg[0] >= num_quals)
 663                 return;
 664         sen = tcp->s_ent->sen;
 665         if (SEN_printargs == sen)
 666                 return;
 667         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
 668                 switch (sen) {
 669                 case SEN_read:
 670                 case SEN_pread:
 671                 case SEN_recv:
 672                 case SEN_recvfrom:
 673                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 674                         return;
 675                 case SEN_readv:
 676                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 677                         return;
 678 #ifdef HAVE_SENDMSG
 679                 case SEN_recvmsg:
 680                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 681                         return;
 682                 case SEN_recvmmsg:
 683                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 684                         return;
 685 #endif
 686                 }
 687         }
 688         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
 689                 switch (sen) {
 690                 case SEN_write:
 691                 case SEN_pwrite:
 692                 case SEN_send:
 693                 case SEN_sendto:
 694                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 695                         break;
 696                 case SEN_writev:
 697                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 698                         break;
 699 #ifdef HAVE_SENDMSG
 700                 case SEN_sendmsg:
 701                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 702                         break;
 703                 case SEN_sendmmsg:
 704                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 705                         break;
 706 #endif
 707                 }
 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 (SEN_syscall == tcp->s_ent->sen)
 796                 decode_mips_subcall(tcp);
 797 #endif
 798
 799         if (   SEN_execve == tcp->s_ent->sen
 800 # if defined(SPARC) || defined(SPARC64)
 801             || SEN_execv == tcp->s_ent->sen
 802 # endif
 803            ) {
 804                 hide_log_until_execve = 0;
 805         }
 806
 807 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 808         switch (tcp->s_ent->sen) {
 809 # ifdef SYS_socket_subcall
 810                 case SEN_socketcall:
 811                         decode_socket_subcall(tcp);
 812                         break;
 813 # endif
 814 # ifdef SYS_ipc_subcall
 815                 case SEN_ipc:
 816                         decode_ipc_subcall(tcp);
 817                         break;
 818 # endif
 819         }
 820 #endif
 821
 822         if (!(tcp->qual_flg & QUAL_TRACE)
 823          || (tracing_paths && !pathtrace_match(tcp))
 824         ) {
 825                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 826                 tcp->sys_func_rval = 0;
 827                 return 0;
 828         }
 829
 830         tcp->flags &= ~TCB_FILTERED;
 831
 832         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
 833                 res = 0;
 834                 goto ret;
 835         }
 836
 837 #ifdef USE_LIBUNWIND
 838         if (stack_trace_enabled) {
 839                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 840                         unwind_capture_stacktrace(tcp);
 841         }
 842 #endif
 843
 844         printleader(tcp);
 845         if (tcp->qual_flg & UNDEFINED_SCNO)
 846                 tprintf("%s(", undefined_scno_name(tcp));
 847         else
 848                 tprintf("%s(", tcp->s_ent->sys_name);
 849         if ((tcp->qual_flg & QUAL_RAW) && SEN_exit != tcp->s_ent->sen)
 850                 res = printargs(tcp);
 851         else
 852                 res = tcp->s_ent->sys_func(tcp);
 853
 854         fflush(tcp->outf);
 855  ret:
 856         tcp->flags |= TCB_INSYSCALL;
 857         tcp->sys_func_rval = res;
 858         /* Measure the entrance time as late as possible to avoid errors. */
 859         if (Tflag || cflag)
 860                 gettimeofday(&tcp->etime, NULL);
 861         return res;
 862 }
 863
 864 static int
 865 trace_syscall_exiting(struct tcb *tcp)
 866 {
 867         int sys_res;
 868         struct timeval tv;
 869         int res;
 870         long u_error;
 871
 872         /* Measure the exit time as early as possible to avoid errors. */
 873         if (Tflag || cflag)
 874                 gettimeofday(&tv, NULL);
 875
 876 #ifdef USE_LIBUNWIND
 877         if (stack_trace_enabled) {
 878                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 879                         unwind_cache_invalidate(tcp);
 880         }
 881 #endif
 882
 883 #if SUPPORTED_PERSONALITIES > 1
 884         update_personality(tcp, tcp->currpers);
 885 #endif
 886         res = (get_regs_error ? -1 : get_syscall_result(tcp));
 887         if (filtered(tcp) || hide_log_until_execve)
 888                 goto ret;
 889
 890         if (cflag) {
 891                 count_syscall(tcp, &tv);
 892                 if (cflag == CFLAG_ONLY_STATS) {
 893                         goto ret;
 894                 }
 895         }
 896
 897         /* If not in -ff mode, and printing_tcp != tcp,
 898          * then the log currently does not end with output
 899          * of _our syscall entry_, but with something else.
 900          * We need to say which syscall's return is this.
 901          *
 902          * Forced reprinting via TCB_REPRINT is used only by
 903          * "strace -ff -oLOG test/threaded_execve" corner case.
 904          * It's the only case when -ff mode needs reprinting.
 905          */
 906         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 907                 tcp->flags &= ~TCB_REPRINT;
 908                 printleader(tcp);
 909                 if (tcp->qual_flg & UNDEFINED_SCNO)
 910                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
 911                 else
 912                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 913         }
 914         printing_tcp = tcp;
 915
 916         tcp->s_prev_ent = NULL;
 917         if (res != 1) {
 918                 /* There was error in one of prior ptrace ops */
 919                 tprints(") ");
 920                 tabto();
 921                 tprints("= ? <unavailable>\n");
 922                 line_ended();
 923                 tcp->flags &= ~TCB_INSYSCALL;
 924                 tcp->sys_func_rval = 0;
 925                 return res;
 926         }
 927         tcp->s_prev_ent = tcp->s_ent;
 928
 929         sys_res = 0;
 930         if (tcp->qual_flg & QUAL_RAW) {
 931                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 932         } else {
 933         /* FIXME: not_failing_only (IOW, option -z) is broken:
 934          * failure of syscall is known only after syscall return.
 935          * Thus we end up with something like this on, say, ENOENT:
 936          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 937          *     {next syscall decode}
 938          * whereas the intended result is that open(...) line
 939          * is not shown at all.
 940          */
 941                 if (not_failing_only && tcp->u_error)
 942                         goto ret;       /* ignore failed syscalls */
 943                 if (tcp->sys_func_rval & RVAL_DECODED)
 944                         sys_res = tcp->sys_func_rval;
 945                 else
 946                         sys_res = tcp->s_ent->sys_func(tcp);
 947         }
 948
 949         tprints(") ");
 950         tabto();
 951         u_error = tcp->u_error;
 952         if (tcp->qual_flg & QUAL_RAW) {
 953                 if (u_error)
 954                         tprintf("= -1 (errno %ld)", u_error);
 955                 else
 956                         tprintf("= %#lx", tcp->u_rval);
 957         }
 958         else if (!(sys_res & RVAL_NONE) && u_error) {
 959                 switch (u_error) {
 960                 /* Blocked signals do not interrupt any syscalls.
 961                  * In this case syscalls don't return ERESTARTfoo codes.
 962                  *
 963                  * Deadly signals set to SIG_DFL interrupt syscalls
 964                  * and kill the process regardless of which of the codes below
 965                  * is returned by the interrupted syscall.
 966                  * In some cases, kernel forces a kernel-generated deadly
 967                  * signal to be unblocked and set to SIG_DFL (and thus cause
 968                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 969                  * or SIGILL. (The alternative is to leave process spinning
 970                  * forever on the faulty instruction - not useful).
 971                  *
 972                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 973                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 974                  * but kernel will always restart them.
 975                  */
 976                 case ERESTARTSYS:
 977                         /* Most common type of signal-interrupted syscall exit code.
 978                          * The system call will be restarted with the same arguments
 979                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 980                          */
 981                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 982                         break;
 983                 case ERESTARTNOINTR:
 984                         /* Rare. For example, fork() returns this if interrupted.
 985                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 986                          */
 987                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 988                         break;
 989                 case ERESTARTNOHAND:
 990                         /* pause(), rt_sigsuspend() etc use this code.
 991                          * SA_RESTART is ignored (assumed not set):
 992                          * syscall won't restart (will return EINTR instead)
 993                          * even after signal with SA_RESTART set. However,
 994                          * after SIG_IGN or SIG_DFL signal it will restart
 995                          * (thus the name "restart only if has no handler").
 996                          */
 997                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 998                         break;
 999                 case ERESTART_RESTARTBLOCK:
1000                         /* Syscalls like nanosleep(), poll() which can't be
1001                          * restarted with their original arguments use this
1002                          * code. Kernel will execute restart_syscall() instead,
1003                          * which changes arguments before restarting syscall.
1004                          * SA_RESTART is ignored (assumed not set) similarly
1005                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1006                          * since restart data is saved in "restart block"
1007                          * in task struct, and if signal handler uses a syscall
1008                          * which in turn saves another such restart block,
1009                          * old data is lost and restart becomes impossible)
1010                          */
1011                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1012                         break;
1013                 default:
1014                         if ((unsigned long) u_error < nerrnos
1015                             && errnoent[u_error])
1016                                 tprintf("= -1 %s (%s)", errnoent[u_error],
1017                                         strerror(u_error));
1018                         else
1019                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1020                                         strerror(u_error));
1021                         break;
1022                 }
1023                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1024                         tprintf(" (%s)", tcp->auxstr);
1025         }
1026         else {
1027                 if (sys_res & RVAL_NONE)
1028                         tprints("= ?");
1029                 else {
1030                         switch (sys_res & RVAL_MASK) {
1031                         case RVAL_HEX:
1032 #if SUPPORTED_PERSONALITIES > 1
1033                                 if (current_wordsize < sizeof(long))
1034                                         tprintf("= %#x",
1035                                                 (unsigned int) tcp->u_rval);
1036                                 else
1037 #endif
1038                                         tprintf("= %#lx", tcp->u_rval);
1039                                 break;
1040                         case RVAL_OCTAL:
1041                                 tprintf("= %#lo", tcp->u_rval);
1042                                 break;
1043                         case RVAL_UDECIMAL:
1044                                 tprintf("= %lu", tcp->u_rval);
1045                                 break;
1046                         case RVAL_DECIMAL:
1047                                 tprintf("= %ld", tcp->u_rval);
1048                                 break;
1049                         case RVAL_FD:
1050                                 if (show_fd_path) {
1051                                         tprints("= ");
1052                                         printfd(tcp, tcp->u_rval);
1053                                 }
1054                                 else
1055                                         tprintf("= %ld", tcp->u_rval);
1056                                 break;
1057 #if defined(LINUX_MIPSN32) || defined(X32)
1058                         /*
1059                         case RVAL_LHEX:
1060                                 tprintf("= %#llx", tcp->u_lrval);
1061                                 break;
1062                         case RVAL_LOCTAL:
1063                                 tprintf("= %#llo", tcp->u_lrval);
1064                                 break;
1065                         */
1066                         case RVAL_LUDECIMAL:
1067                                 tprintf("= %llu", tcp->u_lrval);
1068                                 break;
1069                         /*
1070                         case RVAL_LDECIMAL:
1071                                 tprintf("= %lld", tcp->u_lrval);
1072                                 break;
1073                         */
1074 #endif
1075                         default:
1076                                 error_msg("invalid rval format");
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         tcp->sys_func_rval = 0;
1100         return 0;
1101 }
1102
1103 int
1104 trace_syscall(struct tcb *tcp)
1105 {
1106         return exiting(tcp) ?
1107                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1108 }
1109
1110 /*
1111  * Cannot rely on __kernel_[u]long_t being defined,
1112  * it is quite a recent feature of <asm/posix_types.h>.
1113  */
1114 #ifdef __kernel_long_t
1115 typedef __kernel_long_t kernel_long_t;
1116 typedef __kernel_ulong_t kernel_ulong_t;
1117 #else
1118 # ifdef X32
1119 typedef long long kernel_long_t;
1120 typedef unsigned long long kernel_ulong_t;
1121 # else
1122 typedef long kernel_long_t;
1123 typedef unsigned long kernel_ulong_t;
1124 # endif
1125 #endif
1126
1127 /*
1128  * Check the syscall return value register value for whether it is
1129  * a negated errno code indicating an error, or a success return value.
1130  */
1131 static inline bool
1132 is_negated_errno(kernel_ulong_t val)
1133 {
1134         /* Linux kernel defines MAX_ERRNO to 4095. */
1135         kernel_ulong_t max = -(kernel_long_t) 4095;
1136
1137 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1138         if (current_wordsize < sizeof(val)) {
1139                 val = (uint32_t) val;
1140                 max = (uint32_t) max;
1141         }
1142 #elif defined X32
1143         /*
1144          * current_wordsize is 4 even in personality 0 (native X32)
1145          * but truncation _must not_ be done in it.
1146          * can't check current_wordsize here!
1147          */
1148         if (current_personality != 0) {
1149                 val = (uint32_t) val;
1150                 max = (uint32_t) max;
1151         }
1152 #endif
1153
1154         return val >= max;
1155 }
1156
1157 #include "arch_regs.c"
1158
1159 #ifdef HAVE_GETRVAL2
1160 # include "arch_getrval2.c"
1161 #endif
1162
1163 void
1164 print_pc(struct tcb *tcp)
1165 {
1166         const char *fmt;
1167         const char *bad;
1168
1169 #ifdef current_wordsize
1170 # define pc_wordsize current_wordsize
1171 #else
1172 # define pc_wordsize personality_wordsize[tcp->currpers]
1173 #endif
1174
1175         if (pc_wordsize == 4) {
1176                 fmt = "[%08lx] ";
1177                 bad = "[????????] ";
1178         } else {
1179                 fmt = "[%016lx] ";
1180                 bad = "[????????????????] ";
1181         }
1182
1183 #undef pc_wordsize
1184 #define PRINTBADPC tprints(bad)
1185
1186         if (get_regs_error) {
1187                 PRINTBADPC;
1188                 return;
1189         }
1190
1191 #include "print_pc.c"
1192 }
1193
1194 #if defined X86_64 || defined POWERPC
1195 # include "getregs_old.c"
1196 #endif
1197
1198 #if defined ARCH_REGS_FOR_GETREGSET
1199 static long
1200 get_regset(pid_t pid)
1201 {
1202 # ifdef ARCH_IOVEC_FOR_GETREGSET
1203         /* variable iovec */
1204         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1205         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1206                       &ARCH_IOVEC_FOR_GETREGSET);
1207 # else
1208         /* constant iovec */
1209         static struct iovec io = {
1210                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1211                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1212         };
1213         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1214
1215 # endif
1216 }
1217 #endif /* ARCH_REGS_FOR_GETREGSET */
1218
1219 void
1220 get_regs(pid_t pid)
1221 {
1222 #ifdef ARCH_REGS_FOR_GETREGSET
1223 # ifdef X86_64
1224         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1225         static int getregset_support;
1226
1227         if (getregset_support >= 0) {
1228                 get_regs_error = get_regset(pid);
1229                 if (getregset_support > 0)
1230                         return;
1231                 if (get_regs_error >= 0) {
1232                         getregset_support = 1;
1233                         return;
1234                 }
1235                 if (errno == EPERM || errno == ESRCH)
1236                         return;
1237                 getregset_support = -1;
1238         }
1239         getregs_old(pid);
1240 # else /* !X86_64 */
1241         /* Assume that PTRACE_GETREGSET works. */
1242         get_regs_error = get_regset(pid);
1243 # endif
1244 #elif defined ARCH_REGS_FOR_GETREGS
1245 # if defined SPARC || defined SPARC64
1246         /* SPARC systems have the meaning of data and addr reversed */
1247         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1248 # elif defined POWERPC
1249         static bool old_kernel = 0;
1250         if (old_kernel)
1251                 goto old;
1252         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1253         if (get_regs_error && errno == EIO) {
1254                 old_kernel = 1;
1255  old:
1256                 get_regs_error = getregs_old(pid);
1257         }
1258 # else
1259         /* Assume that PTRACE_GETREGS works. */
1260         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1261 # endif
1262
1263 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1264 #  warning get_regs is not implemented for this architecture yet
1265         get_regs_error = 0;
1266 #endif
1267 }
1268
1269 /* Returns:
1270  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1271  * 1: ok, continue in trace_syscall_entering().
1272  * other: error, trace_syscall_entering() should print error indicator
1273  *    ("????" etc) and bail out.
1274  */
1275 int
1276 get_scno(struct tcb *tcp)
1277 {
1278         if (get_regs_error)
1279                 return -1;
1280
1281         long scno = 0;
1282
1283 #include "get_scno.c"
1284
1285         tcp->scno = scno;
1286         if (SCNO_IS_VALID(tcp->scno)) {
1287                 tcp->s_ent = &sysent[scno];
1288                 tcp->qual_flg = qual_flags[scno];
1289         } else {
1290                 static const struct_sysent unknown = {
1291                         .nargs = MAX_ARGS,
1292                         .sys_flags = 0,
1293                         .sys_func = printargs,
1294                         .sys_name = "system call",
1295                 };
1296                 tcp->s_ent = &unknown;
1297                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1298                 if (debug_flag)
1299                         error_msg("pid %d invalid syscall %ld", 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 }