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 "native_defs.h"
  36 #include <sys/param.h>
  37
  38 /* for struct iovec */
  39 #include <sys/uio.h>
  40
  41 #include "regs.h"
  42 #include "ptrace.h"
  43
  44 #if defined(SPARC64)
  45 # undef PTRACE_GETREGS
  46 # define PTRACE_GETREGS PTRACE_GETREGS64
  47 # undef PTRACE_SETREGS
  48 # define PTRACE_SETREGS PTRACE_SETREGS64
  49 #endif
  50
  51 #if defined SPARC64
  52 # include <asm/psrcompat.h>
  53 #elif defined SPARC
  54 # include <asm/psr.h>
  55 #endif
  56
  57 #ifdef IA64
  58 # include <asm/rse.h>
  59 #endif
  60
  61 #ifndef NT_PRSTATUS
  62 # define NT_PRSTATUS 1
  63 #endif
  64
  65 #ifndef NSIG
  66 # warning: NSIG is not defined, using 32
  67 # define NSIG 32
  68 #endif
  69
  70 #include "syscall.h"
  71
  72 /* Define these shorthand notations to simplify the syscallent files. */
  73 #define TD TRACE_DESC
  74 #define TF TRACE_FILE
  75 #define TI TRACE_IPC
  76 #define TN TRACE_NETWORK
  77 #define TP TRACE_PROCESS
  78 #define TS TRACE_SIGNAL
  79 #define TM TRACE_MEMORY
  80 #define NF SYSCALL_NEVER_FAILS
  81 #define MA MAX_ARGS
  82 #define SI STACKTRACE_INVALIDATE_CACHE
  83 #define SE STACKTRACE_CAPTURE_ON_ENTER
  84
  85 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  86
  87 const struct_sysent sysent0[] = {
  88 #include "syscallent.h"
  89 };
  90
  91 #if SUPPORTED_PERSONALITIES > 1
  92 # include PERSONALITY1_INCLUDE_FUNCS
  93 static const struct_sysent sysent1[] = {
  94 # include "syscallent1.h"
  95 };
  96 #endif
  97
  98 #if SUPPORTED_PERSONALITIES > 2
  99 # include PERSONALITY2_INCLUDE_FUNCS
 100 static const struct_sysent sysent2[] = {
 101 # include "syscallent2.h"
 102 };
 103 #endif
 104
 105 /* Now undef them since short defines cause wicked namespace pollution. */
 106 #undef SEN
 107 #undef TD
 108 #undef TF
 109 #undef TI
 110 #undef TN
 111 #undef TP
 112 #undef TS
 113 #undef TM
 114 #undef NF
 115 #undef MA
 116 #undef SI
 117 #undef SE
 118
 119 /*
 120  * `ioctlent[012].h' files are automatically generated by the auxiliary
 121  * program `ioctlsort', such that the list is sorted by the `code' field.
 122  * This has the side-effect of resolving the _IO.. macros into
 123  * plain integers, eliminating the need to include here everything
 124  * in "/usr/include".
 125  */
 126
 127 const char *const errnoent0[] = {
 128 #include "errnoent.h"
 129 };
 130 const char *const signalent0[] = {
 131 #include "signalent.h"
 132 };
 133 const struct_ioctlent ioctlent0[] = {
 134 #include "ioctlent0.h"
 135 };
 136
 137 #if SUPPORTED_PERSONALITIES > 1
 138 static const char *const errnoent1[] = {
 139 # include "errnoent1.h"
 140 };
 141 static const char *const signalent1[] = {
 142 # include "signalent1.h"
 143 };
 144 static const struct_ioctlent ioctlent1[] = {
 145 # include "ioctlent1.h"
 146 };
 147 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 148 static const struct_printers printers0 = {
 149 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 150 };
 151 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 152 static const struct_printers printers1 = {
 153 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 154 };
 155 #endif
 156
 157 #if SUPPORTED_PERSONALITIES > 2
 158 static const char *const errnoent2[] = {
 159 # include "errnoent2.h"
 160 };
 161 static const char *const signalent2[] = {
 162 # include "signalent2.h"
 163 };
 164 static const struct_ioctlent ioctlent2[] = {
 165 # include "ioctlent2.h"
 166 };
 167 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 168 static const struct_printers printers2 = {
 169 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 170 };
 171 #endif
 172
 173 enum {
 174         nsyscalls0 = ARRAY_SIZE(sysent0)
 175 #if SUPPORTED_PERSONALITIES > 1
 176         , nsyscalls1 = ARRAY_SIZE(sysent1)
 177 # if SUPPORTED_PERSONALITIES > 2
 178         , nsyscalls2 = ARRAY_SIZE(sysent2)
 179 # endif
 180 #endif
 181 };
 182
 183 enum {
 184         nerrnos0 = ARRAY_SIZE(errnoent0)
 185 #if SUPPORTED_PERSONALITIES > 1
 186         , nerrnos1 = ARRAY_SIZE(errnoent1)
 187 # if SUPPORTED_PERSONALITIES > 2
 188         , nerrnos2 = ARRAY_SIZE(errnoent2)
 189 # endif
 190 #endif
 191 };
 192
 193 enum {
 194         nsignals0 = ARRAY_SIZE(signalent0)
 195 #if SUPPORTED_PERSONALITIES > 1
 196         , nsignals1 = ARRAY_SIZE(signalent1)
 197 # if SUPPORTED_PERSONALITIES > 2
 198         , nsignals2 = ARRAY_SIZE(signalent2)
 199 # endif
 200 #endif
 201 };
 202
 203 enum {
 204         nioctlents0 = ARRAY_SIZE(ioctlent0)
 205 #if SUPPORTED_PERSONALITIES > 1
 206         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 207 # if SUPPORTED_PERSONALITIES > 2
 208         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 209 # endif
 210 #endif
 211 };
 212
 213 #if SUPPORTED_PERSONALITIES > 1
 214 const struct_sysent *sysent = sysent0;
 215 const char *const *errnoent = errnoent0;
 216 const char *const *signalent = signalent0;
 217 const struct_ioctlent *ioctlent = ioctlent0;
 218 const struct_printers *printers = &printers0;
 219 #endif
 220
 221 unsigned nsyscalls = nsyscalls0;
 222 unsigned nerrnos = nerrnos0;
 223 unsigned nsignals = nsignals0;
 224 unsigned nioctlents = nioctlents0;
 225
 226 unsigned num_quals;
 227 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
 228
 229 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 230         nsyscalls0,
 231 #if SUPPORTED_PERSONALITIES > 1
 232         nsyscalls1,
 233 #endif
 234 #if SUPPORTED_PERSONALITIES > 2
 235         nsyscalls2,
 236 #endif
 237 };
 238 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 239         sysent0,
 240 #if SUPPORTED_PERSONALITIES > 1
 241         sysent1,
 242 #endif
 243 #if SUPPORTED_PERSONALITIES > 2
 244         sysent2,
 245 #endif
 246 };
 247
 248 enum {
 249         MAX_NSYSCALLS1 = (nsyscalls0
 250 #if SUPPORTED_PERSONALITIES > 1
 251                         > nsyscalls1 ? nsyscalls0 : nsyscalls1
 252 #endif
 253                         ),
 254         MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
 255 #if SUPPORTED_PERSONALITIES > 2
 256                         > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
 257 #endif
 258                         ),
 259         MAX_NSYSCALLS = MAX_NSYSCALLS2,
 260         /* We are ready for arches with up to 255 signals,
 261          * even though the largest known signo is on MIPS and it is 128.
 262          * The number of existing syscalls on all arches is
 263          * larger that 255 anyway, so it is just a pedantic matter.
 264          */
 265         MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
 266 };
 267
 268 #if SUPPORTED_PERSONALITIES > 1
 269 unsigned current_personality;
 270
 271 # ifndef current_wordsize
 272 unsigned current_wordsize;
 273 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 274         PERSONALITY0_WORDSIZE,
 275         PERSONALITY1_WORDSIZE,
 276 # if SUPPORTED_PERSONALITIES > 2
 277         PERSONALITY2_WORDSIZE,
 278 # endif
 279 };
 280 # endif
 281
 282 void
 283 set_personality(int personality)
 284 {
 285         nsyscalls = nsyscall_vec[personality];
 286         sysent = sysent_vec[personality];
 287
 288         switch (personality) {
 289         case 0:
 290                 errnoent = errnoent0;
 291                 nerrnos = nerrnos0;
 292                 ioctlent = ioctlent0;
 293                 nioctlents = nioctlents0;
 294                 signalent = signalent0;
 295                 nsignals = nsignals0;
 296                 printers = &printers0;
 297                 break;
 298
 299         case 1:
 300                 errnoent = errnoent1;
 301                 nerrnos = nerrnos1;
 302                 ioctlent = ioctlent1;
 303                 nioctlents = nioctlents1;
 304                 signalent = signalent1;
 305                 nsignals = nsignals1;
 306                 printers = &printers1;
 307                 break;
 308
 309 # if SUPPORTED_PERSONALITIES > 2
 310         case 2:
 311                 errnoent = errnoent2;
 312                 nerrnos = nerrnos2;
 313                 ioctlent = ioctlent2;
 314                 nioctlents = nioctlents2;
 315                 signalent = signalent2;
 316                 nsignals = nsignals2;
 317                 printers = &printers2;
 318                 break;
 319 # endif
 320         }
 321
 322         current_personality = personality;
 323 # ifndef current_wordsize
 324         current_wordsize = personality_wordsize[personality];
 325 # endif
 326 }
 327
 328 static void
 329 update_personality(struct tcb *tcp, unsigned int personality)
 330 {
 331         if (personality == current_personality)
 332                 return;
 333         set_personality(personality);
 334
 335         if (personality == tcp->currpers)
 336                 return;
 337         tcp->currpers = personality;
 338
 339 # undef PERSONALITY_NAMES
 340 # if defined POWERPC64
 341 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 342 # elif defined X86_64
 343 #  define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
 344 # elif defined X32
 345 #  define PERSONALITY_NAMES {"x32", "32 bit"}
 346 # elif defined AARCH64
 347 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 348 # elif defined TILE
 349 #  define PERSONALITY_NAMES {"64-bit", "32-bit"}
 350 # endif
 351 # ifdef PERSONALITY_NAMES
 352         if (!qflag) {
 353                 static const char *const names[] = PERSONALITY_NAMES;
 354                 error_msg("[ Process PID=%d runs in %s mode. ]",
 355                           tcp->pid, names[personality]);
 356         }
 357 # endif
 358 }
 359 #endif
 360
 361 static int qual_syscall(), qual_signal(), qual_desc();
 362
 363 static const struct qual_options {
 364         unsigned int bitflag;
 365         const char *option_name;
 366         int (*qualify)(const char *, int, int);
 367         const char *argument_name;
 368 } qual_options[] = {
 369         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 370         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 371         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 372         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 373         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 374         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 375         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 376         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 377         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 378         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 379         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 380         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 381         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 382         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 383         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 384         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 385         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 386         { 0,            NULL,           NULL,           NULL            },
 387 };
 388
 389 static void
 390 reallocate_qual(const unsigned int n)
 391 {
 392         unsigned p;
 393         qualbits_t *qp;
 394         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 395                 qp = qual_vec[p] = xreallocarray(qual_vec[p], n,
 396                                                  sizeof(qualbits_t));
 397                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 398         }
 399         num_quals = n;
 400 }
 401
 402 static void
 403 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 404 {
 405         int p;
 406
 407         if (num_quals <= n)
 408                 reallocate_qual(n + 1);
 409
 410         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 411                 if (pers == p || pers < 0) {
 412                         if (not)
 413                                 qual_vec[p][n] &= ~bitflag;
 414                         else
 415                                 qual_vec[p][n] |= bitflag;
 416                 }
 417         }
 418 }
 419
 420 static int
 421 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 422 {
 423         int p;
 424         unsigned int i;
 425         int rc = -1;
 426
 427         if (*s >= '0' && *s <= '9') {
 428                 i = string_to_uint(s);
 429                 if (i >= MAX_NSYSCALLS)
 430                         return -1;
 431                 qualify_one(i, bitflag, not, -1);
 432                 return 0;
 433         }
 434
 435         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 436                 for (i = 0; i < nsyscall_vec[p]; i++) {
 437                         if (sysent_vec[p][i].sys_name
 438                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 439                         ) {
 440                                 qualify_one(i, bitflag, not, p);
 441                                 rc = 0;
 442                         }
 443                 }
 444         }
 445
 446         return rc;
 447 }
 448
 449 static int
 450 qual_signal(const char *s, const unsigned int bitflag, const int not)
 451 {
 452         unsigned int i;
 453
 454         if (*s >= '0' && *s <= '9') {
 455                 int signo = string_to_uint(s);
 456                 if (signo < 0 || signo > 255)
 457                         return -1;
 458                 qualify_one(signo, bitflag, not, -1);
 459                 return 0;
 460         }
 461         if (strncasecmp(s, "SIG", 3) == 0)
 462                 s += 3;
 463         for (i = 0; i <= NSIG; i++) {
 464                 if (strcasecmp(s, signame(i) + 3) == 0) {
 465                         qualify_one(i, bitflag, not, -1);
 466                         return 0;
 467                 }
 468         }
 469         return -1;
 470 }
 471
 472 static int
 473 qual_desc(const char *s, const unsigned int bitflag, const int not)
 474 {
 475         if (*s >= '0' && *s <= '9') {
 476                 int desc = string_to_uint(s);
 477                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 478                         return -1;
 479                 qualify_one(desc, bitflag, not, -1);
 480                 return 0;
 481         }
 482         return -1;
 483 }
 484
 485 static int
 486 lookup_class(const char *s)
 487 {
 488         if (strcmp(s, "file") == 0)
 489                 return TRACE_FILE;
 490         if (strcmp(s, "ipc") == 0)
 491                 return TRACE_IPC;
 492         if (strcmp(s, "network") == 0)
 493                 return TRACE_NETWORK;
 494         if (strcmp(s, "process") == 0)
 495                 return TRACE_PROCESS;
 496         if (strcmp(s, "signal") == 0)
 497                 return TRACE_SIGNAL;
 498         if (strcmp(s, "desc") == 0)
 499                 return TRACE_DESC;
 500         if (strcmp(s, "memory") == 0)
 501                 return TRACE_MEMORY;
 502         return -1;
 503 }
 504
 505 void
 506 qualify(const char *s)
 507 {
 508         const struct qual_options *opt;
 509         char *copy;
 510         const char *p;
 511         int not;
 512         unsigned int i;
 513
 514         if (num_quals == 0)
 515                 reallocate_qual(MIN_QUALS);
 516
 517         opt = &qual_options[0];
 518         for (i = 0; (p = qual_options[i].option_name); i++) {
 519                 unsigned int len = strlen(p);
 520                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 521                         opt = &qual_options[i];
 522                         s += len + 1;
 523                         break;
 524                 }
 525         }
 526         not = 0;
 527         if (*s == '!') {
 528                 not = 1;
 529                 s++;
 530         }
 531         if (strcmp(s, "none") == 0) {
 532                 not = 1 - not;
 533                 s = "all";
 534         }
 535         if (strcmp(s, "all") == 0) {
 536                 for (i = 0; i < num_quals; i++) {
 537                         qualify_one(i, opt->bitflag, not, -1);
 538                 }
 539                 return;
 540         }
 541         for (i = 0; i < num_quals; i++) {
 542                 qualify_one(i, opt->bitflag, !not, -1);
 543         }
 544         copy = xstrdup(s);
 545         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 546                 int n;
 547                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 548                         unsigned pers;
 549                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 550                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 551                                         if (sysent_vec[pers][i].sys_flags & n)
 552                                                 qualify_one(i, opt->bitflag, not, pers);
 553                         }
 554                         continue;
 555                 }
 556                 if (opt->qualify(p, opt->bitflag, not)) {
 557                         error_msg_and_die("invalid %s '%s'",
 558                                 opt->argument_name, p);
 559                 }
 560         }
 561         free(copy);
 562         return;
 563 }
 564
 565 #ifdef SYS_socket_subcall
 566 static void
 567 decode_socket_subcall(struct tcb *tcp)
 568 {
 569         unsigned long addr;
 570         unsigned int n;
 571
 572         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 573                 return;
 574
 575         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 576         tcp->qual_flg = qual_flags[tcp->scno];
 577         tcp->s_ent = &sysent[tcp->scno];
 578         addr = tcp->u_arg[1];
 579         n = tcp->s_ent->nargs;
 580         if (sizeof(tcp->u_arg[0]) == current_wordsize) {
 581                 memset(tcp->u_arg, 0, n * sizeof(tcp->u_arg[0]));
 582                 (void) umoven(tcp, addr, n * sizeof(tcp->u_arg[0]), tcp->u_arg);
 583         } else {
 584                 unsigned int args[n];
 585                 unsigned int i;
 586
 587                 memset(args, 0, sizeof(args));
 588                 (void) umove(tcp, addr, &args);
 589                 for (i = 0; i < n; ++i)
 590                         tcp->u_arg[i] = args[i];
 591         }
 592 }
 593 #endif
 594
 595 #ifdef SYS_ipc_subcall
 596 static void
 597 decode_ipc_subcall(struct tcb *tcp)
 598 {
 599         unsigned int i, n;
 600
 601         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 602                 return;
 603
 604         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 605         tcp->qual_flg = qual_flags[tcp->scno];
 606         tcp->s_ent = &sysent[tcp->scno];
 607         n = tcp->s_ent->nargs;
 608         for (i = 0; i < n; i++)
 609                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 610 }
 611 #endif
 612
 613 #ifdef LINUX_MIPSO32
 614 static void
 615 decode_mips_subcall(struct tcb *tcp)
 616 {
 617         if (!SCNO_IS_VALID(tcp->u_arg[0]))
 618                 return;
 619         tcp->scno = tcp->u_arg[0];
 620         tcp->qual_flg = qual_flags[tcp->scno];
 621         tcp->s_ent = &sysent[tcp->scno];
 622         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 623                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 624         /*
 625          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 626          * and sync_file_range) would require additional code,
 627          * see linux/mips/get_syscall_args.c
 628          */
 629 }
 630
 631 SYS_FUNC(syscall)
 632 {
 633         return printargs(tcp);
 634 }
 635 #endif
 636
 637 int
 638 printargs(struct tcb *tcp)
 639 {
 640         if (entering(tcp)) {
 641                 int i;
 642                 int n = tcp->s_ent->nargs;
 643                 for (i = 0; i < n; i++)
 644                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 645         }
 646         return 0;
 647 }
 648
 649 int
 650 printargs_lu(struct tcb *tcp)
 651 {
 652         if (entering(tcp)) {
 653                 int i;
 654                 int n = tcp->s_ent->nargs;
 655                 for (i = 0; i < n; i++)
 656                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 657         }
 658         return 0;
 659 }
 660
 661 int
 662 printargs_ld(struct tcb *tcp)
 663 {
 664         if (entering(tcp)) {
 665                 int i;
 666                 int n = tcp->s_ent->nargs;
 667                 for (i = 0; i < n; i++)
 668                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 669         }
 670         return 0;
 671 }
 672
 673 static void
 674 dumpio(struct tcb *tcp)
 675 {
 676         int sen;
 677
 678         if (syserror(tcp))
 679                 return;
 680         if ((unsigned long) tcp->u_arg[0] >= num_quals)
 681                 return;
 682         sen = tcp->s_ent->sen;
 683         if (SEN_printargs == sen)
 684                 return;
 685         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
 686                 switch (sen) {
 687                 case SEN_read:
 688                 case SEN_pread:
 689                 case SEN_recv:
 690                 case SEN_recvfrom:
 691                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 692                         return;
 693                 case SEN_readv:
 694                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 695                         return;
 696                 case SEN_recvmsg:
 697                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 698                         return;
 699                 case SEN_recvmmsg:
 700                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 701                         return;
 702                 }
 703         }
 704         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
 705                 switch (sen) {
 706                 case SEN_write:
 707                 case SEN_pwrite:
 708                 case SEN_send:
 709                 case SEN_sendto:
 710                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 711                         break;
 712                 case SEN_writev:
 713                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 714                         break;
 715                 case SEN_sendmsg:
 716                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
 717                         break;
 718                 case SEN_sendmmsg:
 719                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 720                         break;
 721                 }
 722         }
 723 }
 724
 725 /*
 726  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 727  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 728  */
 729 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 730 static long
 731 shuffle_scno(unsigned long scno)
 732 {
 733         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 734                 return scno;
 735
 736         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 737         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 738                 return 0x000ffff0;
 739         if (scno == 0x000ffff0)
 740                 return ARM_FIRST_SHUFFLED_SYSCALL;
 741
 742 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 743         /*
 744          * Is it ARM specific syscall?
 745          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 746          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 747          */
 748         if (scno >= 0x000f0000 &&
 749             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 750                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 751         }
 752         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 753                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 754         }
 755
 756         return scno;
 757 }
 758 #else
 759 # define shuffle_scno(scno) ((long)(scno))
 760 #endif
 761
 762 const char *
 763 syscall_name(long scno)
 764 {
 765         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 766
 767         if (SCNO_IS_VALID(scno))
 768                 return sysent[scno].sys_name;
 769         else {
 770                 sprintf(buf, "syscall_%lu", shuffle_scno(scno));
 771                 return buf;
 772         }
 773 }
 774
 775 static long get_regs_error;
 776
 777 void
 778 clear_regs(void)
 779 {
 780         get_regs_error = -1;
 781 }
 782
 783 static int get_syscall_args(struct tcb *);
 784 static int get_syscall_result(struct tcb *);
 785 static int arch_get_scno(struct tcb *tcp);
 786 static void get_error(struct tcb *, const bool);
 787 #if defined X86_64 || defined POWERPC
 788 static int getregs_old(pid_t);
 789 #endif
 790
 791 static int
 792 trace_syscall_entering(struct tcb *tcp)
 793 {
 794         int res, scno_good;
 795
 796         scno_good = res = get_scno(tcp);
 797         if (res == 0)
 798                 return res;
 799         if (res == 1)
 800                 res = get_syscall_args(tcp);
 801
 802         if (res != 1) {
 803                 printleader(tcp);
 804                 if (scno_good != 1)
 805                         tprints("????" /* anti-trigraph gap */ "(");
 806                 else if (tcp->qual_flg & UNDEFINED_SCNO)
 807                         tprintf("%s(", syscall_name(tcp->scno));
 808                 else
 809                         tprintf("%s(", tcp->s_ent->sys_name);
 810                 /*
 811                  * " <unavailable>" will be added later by the code which
 812                  * detects ptrace errors.
 813                  */
 814                 goto ret;
 815         }
 816
 817 #ifdef LINUX_MIPSO32
 818         if (SEN_syscall == tcp->s_ent->sen)
 819                 decode_mips_subcall(tcp);
 820 #endif
 821
 822         if (   SEN_execve == tcp->s_ent->sen
 823 # if defined(SPARC) || defined(SPARC64)
 824             || SEN_execv == tcp->s_ent->sen
 825 # endif
 826            ) {
 827                 hide_log_until_execve = 0;
 828         }
 829
 830 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 831         switch (tcp->s_ent->sen) {
 832 # ifdef SYS_socket_subcall
 833                 case SEN_socketcall:
 834                         decode_socket_subcall(tcp);
 835                         break;
 836 # endif
 837 # ifdef SYS_ipc_subcall
 838                 case SEN_ipc:
 839                         decode_ipc_subcall(tcp);
 840                         break;
 841 # endif
 842         }
 843 #endif
 844
 845         if (!(tcp->qual_flg & QUAL_TRACE)
 846          || (tracing_paths && !pathtrace_match(tcp))
 847         ) {
 848                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 849                 tcp->sys_func_rval = 0;
 850                 return 0;
 851         }
 852
 853         tcp->flags &= ~TCB_FILTERED;
 854
 855         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
 856                 res = 0;
 857                 goto ret;
 858         }
 859
 860 #ifdef USE_LIBUNWIND
 861         if (stack_trace_enabled) {
 862                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 863                         unwind_capture_stacktrace(tcp);
 864         }
 865 #endif
 866
 867         printleader(tcp);
 868         if (tcp->qual_flg & UNDEFINED_SCNO)
 869                 tprintf("%s(", syscall_name(tcp->scno));
 870         else
 871                 tprintf("%s(", tcp->s_ent->sys_name);
 872         if ((tcp->qual_flg & QUAL_RAW) && SEN_exit != tcp->s_ent->sen)
 873                 res = printargs(tcp);
 874         else
 875                 res = tcp->s_ent->sys_func(tcp);
 876
 877         fflush(tcp->outf);
 878  ret:
 879         tcp->flags |= TCB_INSYSCALL;
 880         tcp->sys_func_rval = res;
 881         /* Measure the entrance time as late as possible to avoid errors. */
 882         if (Tflag || cflag)
 883                 gettimeofday(&tcp->etime, NULL);
 884         return res;
 885 }
 886
 887 static int
 888 trace_syscall_exiting(struct tcb *tcp)
 889 {
 890         int sys_res;
 891         struct timeval tv;
 892         int res;
 893         long u_error;
 894
 895         /* Measure the exit time as early as possible to avoid errors. */
 896         if (Tflag || cflag)
 897                 gettimeofday(&tv, NULL);
 898
 899 #ifdef USE_LIBUNWIND
 900         if (stack_trace_enabled) {
 901                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 902                         unwind_cache_invalidate(tcp);
 903         }
 904 #endif
 905
 906 #if SUPPORTED_PERSONALITIES > 1
 907         update_personality(tcp, tcp->currpers);
 908 #endif
 909         res = (get_regs_error ? -1 : get_syscall_result(tcp));
 910         if (filtered(tcp) || hide_log_until_execve)
 911                 goto ret;
 912
 913         if (cflag) {
 914                 count_syscall(tcp, &tv);
 915                 if (cflag == CFLAG_ONLY_STATS) {
 916                         goto ret;
 917                 }
 918         }
 919
 920         /* If not in -ff mode, and printing_tcp != tcp,
 921          * then the log currently does not end with output
 922          * of _our syscall entry_, but with something else.
 923          * We need to say which syscall's return is this.
 924          *
 925          * Forced reprinting via TCB_REPRINT is used only by
 926          * "strace -ff -oLOG test/threaded_execve" corner case.
 927          * It's the only case when -ff mode needs reprinting.
 928          */
 929         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 930                 tcp->flags &= ~TCB_REPRINT;
 931                 printleader(tcp);
 932                 if (tcp->qual_flg & UNDEFINED_SCNO)
 933                         tprintf("<... %s resumed> ", syscall_name(tcp->scno));
 934                 else
 935                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 936         }
 937         printing_tcp = tcp;
 938
 939         tcp->s_prev_ent = NULL;
 940         if (res != 1) {
 941                 /* There was error in one of prior ptrace ops */
 942                 tprints(") ");
 943                 tabto();
 944                 tprints("= ? <unavailable>\n");
 945                 line_ended();
 946                 tcp->flags &= ~TCB_INSYSCALL;
 947                 tcp->sys_func_rval = 0;
 948                 return res;
 949         }
 950         tcp->s_prev_ent = tcp->s_ent;
 951
 952         sys_res = 0;
 953         if (tcp->qual_flg & QUAL_RAW) {
 954                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 955         } else {
 956         /* FIXME: not_failing_only (IOW, option -z) is broken:
 957          * failure of syscall is known only after syscall return.
 958          * Thus we end up with something like this on, say, ENOENT:
 959          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 960          *     {next syscall decode}
 961          * whereas the intended result is that open(...) line
 962          * is not shown at all.
 963          */
 964                 if (not_failing_only && tcp->u_error)
 965                         goto ret;       /* ignore failed syscalls */
 966                 if (tcp->sys_func_rval & RVAL_DECODED)
 967                         sys_res = tcp->sys_func_rval;
 968                 else
 969                         sys_res = tcp->s_ent->sys_func(tcp);
 970         }
 971
 972         tprints(") ");
 973         tabto();
 974         u_error = tcp->u_error;
 975         if (tcp->qual_flg & QUAL_RAW) {
 976                 if (u_error)
 977                         tprintf("= -1 (errno %ld)", u_error);
 978                 else
 979                         tprintf("= %#lx", tcp->u_rval);
 980         }
 981         else if (!(sys_res & RVAL_NONE) && u_error) {
 982                 switch (u_error) {
 983                 /* Blocked signals do not interrupt any syscalls.
 984                  * In this case syscalls don't return ERESTARTfoo codes.
 985                  *
 986                  * Deadly signals set to SIG_DFL interrupt syscalls
 987                  * and kill the process regardless of which of the codes below
 988                  * is returned by the interrupted syscall.
 989                  * In some cases, kernel forces a kernel-generated deadly
 990                  * signal to be unblocked and set to SIG_DFL (and thus cause
 991                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 992                  * or SIGILL. (The alternative is to leave process spinning
 993                  * forever on the faulty instruction - not useful).
 994                  *
 995                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 996                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 997                  * but kernel will always restart them.
 998                  */
 999                 case ERESTARTSYS:
1000                         /* Most common type of signal-interrupted syscall exit code.
1001                          * The system call will be restarted with the same arguments
1002                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
1003                          */
1004                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
1005                         break;
1006                 case ERESTARTNOINTR:
1007                         /* Rare. For example, fork() returns this if interrupted.
1008                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
1009                          */
1010                         tprints("= ? ERESTARTNOINTR (To be restarted)");
1011                         break;
1012                 case ERESTARTNOHAND:
1013                         /* pause(), rt_sigsuspend() etc use this code.
1014                          * SA_RESTART is ignored (assumed not set):
1015                          * syscall won't restart (will return EINTR instead)
1016                          * even after signal with SA_RESTART set. However,
1017                          * after SIG_IGN or SIG_DFL signal it will restart
1018                          * (thus the name "restart only if has no handler").
1019                          */
1020                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
1021                         break;
1022                 case ERESTART_RESTARTBLOCK:
1023                         /* Syscalls like nanosleep(), poll() which can't be
1024                          * restarted with their original arguments use this
1025                          * code. Kernel will execute restart_syscall() instead,
1026                          * which changes arguments before restarting syscall.
1027                          * SA_RESTART is ignored (assumed not set) similarly
1028                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
1029                          * since restart data is saved in "restart block"
1030                          * in task struct, and if signal handler uses a syscall
1031                          * which in turn saves another such restart block,
1032                          * old data is lost and restart becomes impossible)
1033                          */
1034                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
1035                         break;
1036                 default:
1037                         if ((unsigned long) u_error < nerrnos
1038                             && errnoent[u_error])
1039                                 tprintf("= -1 %s (%s)", errnoent[u_error],
1040                                         strerror(u_error));
1041                         else
1042                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
1043                                         strerror(u_error));
1044                         break;
1045                 }
1046                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1047                         tprintf(" (%s)", tcp->auxstr);
1048         }
1049         else {
1050                 if (sys_res & RVAL_NONE)
1051                         tprints("= ?");
1052                 else {
1053                         switch (sys_res & RVAL_MASK) {
1054                         case RVAL_HEX:
1055 #if SUPPORTED_PERSONALITIES > 1
1056                                 if (current_wordsize < sizeof(long))
1057                                         tprintf("= %#x",
1058                                                 (unsigned int) tcp->u_rval);
1059                                 else
1060 #endif
1061                                         tprintf("= %#lx", tcp->u_rval);
1062                                 break;
1063                         case RVAL_OCTAL:
1064                                 tprintf("= %#lo", tcp->u_rval);
1065                                 break;
1066                         case RVAL_UDECIMAL:
1067                                 tprintf("= %lu", tcp->u_rval);
1068                                 break;
1069                         case RVAL_DECIMAL:
1070                                 tprintf("= %ld", tcp->u_rval);
1071                                 break;
1072                         case RVAL_FD:
1073                                 if (show_fd_path) {
1074                                         tprints("= ");
1075                                         printfd(tcp, tcp->u_rval);
1076                                 }
1077                                 else
1078                                         tprintf("= %ld", tcp->u_rval);
1079                                 break;
1080 #if defined(LINUX_MIPSN32) || defined(X32)
1081                         /*
1082                         case RVAL_LHEX:
1083                                 tprintf("= %#llx", tcp->u_lrval);
1084                                 break;
1085                         case RVAL_LOCTAL:
1086                                 tprintf("= %#llo", tcp->u_lrval);
1087                                 break;
1088                         */
1089                         case RVAL_LUDECIMAL:
1090                                 tprintf("= %llu", tcp->u_lrval);
1091                                 break;
1092                         /*
1093                         case RVAL_LDECIMAL:
1094                                 tprintf("= %lld", tcp->u_lrval);
1095                                 break;
1096                         */
1097 #endif
1098                         default:
1099                                 error_msg("invalid rval format");
1100                                 break;
1101                         }
1102                 }
1103                 if ((sys_res & RVAL_STR) && tcp->auxstr)
1104                         tprintf(" (%s)", tcp->auxstr);
1105         }
1106         if (Tflag) {
1107                 tv_sub(&tv, &tv, &tcp->etime);
1108                 tprintf(" <%ld.%06ld>",
1109                         (long) tv.tv_sec, (long) tv.tv_usec);
1110         }
1111         tprints("\n");
1112         dumpio(tcp);
1113         line_ended();
1114
1115 #ifdef USE_LIBUNWIND
1116         if (stack_trace_enabled)
1117                 unwind_print_stacktrace(tcp);
1118 #endif
1119
1120  ret:
1121         tcp->flags &= ~TCB_INSYSCALL;
1122         tcp->sys_func_rval = 0;
1123         return 0;
1124 }
1125
1126 int
1127 trace_syscall(struct tcb *tcp)
1128 {
1129         return exiting(tcp) ?
1130                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
1131 }
1132
1133 bool
1134 is_erestart(struct tcb *tcp)
1135 {
1136         switch (tcp->u_error) {
1137                 case ERESTARTSYS:
1138                 case ERESTARTNOINTR:
1139                 case ERESTARTNOHAND:
1140                 case ERESTART_RESTARTBLOCK:
1141                         return true;
1142                 default:
1143                         return false;
1144         }
1145 }
1146
1147 static int saved_u_error;
1148
1149 void
1150 temporarily_clear_syserror(struct tcb *tcp)
1151 {
1152         saved_u_error = tcp->u_error;
1153         tcp->u_error = 0;
1154 }
1155
1156 void
1157 restore_cleared_syserror(struct tcb *tcp)
1158 {
1159         tcp->u_error = saved_u_error;
1160 }
1161
1162 #include "kernel_types.h"
1163
1164 /*
1165  * Check the syscall return value register value for whether it is
1166  * a negated errno code indicating an error, or a success return value.
1167  */
1168 static inline bool
1169 is_negated_errno(kernel_ulong_t val)
1170 {
1171         /* Linux kernel defines MAX_ERRNO to 4095. */
1172         kernel_ulong_t max = -(kernel_long_t) 4095;
1173
1174 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1175         if (current_wordsize < sizeof(val)) {
1176                 val = (uint32_t) val;
1177                 max = (uint32_t) max;
1178         }
1179 #elif defined X32
1180         /*
1181          * current_wordsize is 4 even in personality 0 (native X32)
1182          * but truncation _must not_ be done in it.
1183          * can't check current_wordsize here!
1184          */
1185         if (current_personality != 0) {
1186                 val = (uint32_t) val;
1187                 max = (uint32_t) max;
1188         }
1189 #endif
1190
1191         return val >= max;
1192 }
1193
1194 #include "arch_regs.c"
1195
1196 #ifdef HAVE_GETRVAL2
1197 # include "arch_getrval2.c"
1198 #endif
1199
1200 void
1201 print_pc(struct tcb *tcp)
1202 {
1203 #if defined ARCH_PC_REG
1204 # define ARCH_GET_PC 0
1205 #elif defined ARCH_PC_PEEK_ADDR
1206         long pc;
1207 # define ARCH_PC_REG pc
1208 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1209 #else
1210 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1211 #endif
1212         if (get_regs_error || ARCH_GET_PC)
1213                 tprints(current_wordsize == 4 ? "[????????] "
1214                                               : "[????????????????] ");
1215         else
1216                 tprintf(current_wordsize == 4 ? "[%08lx] " : "[%016lx] ",
1217                         (unsigned long) ARCH_PC_REG);
1218 }
1219
1220 #if defined ARCH_REGS_FOR_GETREGSET
1221 static long
1222 get_regset(pid_t pid)
1223 {
1224 # ifdef ARCH_IOVEC_FOR_GETREGSET
1225         /* variable iovec */
1226         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1227         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1228                       &ARCH_IOVEC_FOR_GETREGSET);
1229 # else
1230         /* constant iovec */
1231         static struct iovec io = {
1232                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1233                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1234         };
1235         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1236
1237 # endif
1238 }
1239 #endif /* ARCH_REGS_FOR_GETREGSET */
1240
1241 void
1242 get_regs(pid_t pid)
1243 {
1244 #undef USE_GET_SYSCALL_RESULT_REGS
1245 #ifdef ARCH_REGS_FOR_GETREGSET
1246 # ifdef X86_64
1247         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1248         static int getregset_support;
1249
1250         if (getregset_support >= 0) {
1251                 get_regs_error = get_regset(pid);
1252                 if (getregset_support > 0)
1253                         return;
1254                 if (get_regs_error >= 0) {
1255                         getregset_support = 1;
1256                         return;
1257                 }
1258                 if (errno == EPERM || errno == ESRCH)
1259                         return;
1260                 getregset_support = -1;
1261         }
1262         get_regs_error = getregs_old(pid);
1263 # else /* !X86_64 */
1264         /* Assume that PTRACE_GETREGSET works. */
1265         get_regs_error = get_regset(pid);
1266 # endif
1267 #elif defined ARCH_REGS_FOR_GETREGS
1268 # if defined SPARC || defined SPARC64
1269         /* SPARC systems have the meaning of data and addr reversed */
1270         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1271 # elif defined POWERPC
1272         static bool old_kernel = 0;
1273         if (old_kernel)
1274                 goto old;
1275         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1276         if (get_regs_error && errno == EIO) {
1277                 old_kernel = 1;
1278  old:
1279                 get_regs_error = getregs_old(pid);
1280         }
1281 # else
1282         /* Assume that PTRACE_GETREGS works. */
1283         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1284 # endif
1285
1286 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1287 # define USE_GET_SYSCALL_RESULT_REGS 1
1288 # warning get_regs is not implemented for this architecture yet
1289         get_regs_error = 0;
1290 #endif
1291 }
1292
1293 /*
1294  * Returns:
1295  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1296  * 1: ok, continue in trace_syscall_entering().
1297  * other: error, trace_syscall_entering() should print error indicator
1298  *    ("????" etc) and bail out.
1299  */
1300 int
1301 get_scno(struct tcb *tcp)
1302 {
1303         if (get_regs_error)
1304                 return -1;
1305
1306         int rc = arch_get_scno(tcp);
1307         if (rc != 1)
1308                 return rc;
1309
1310         if (SCNO_IS_VALID(tcp->scno)) {
1311                 tcp->s_ent = &sysent[tcp->scno];
1312                 tcp->qual_flg = qual_flags[tcp->scno];
1313         } else {
1314                 static const struct_sysent unknown = {
1315                         .nargs = MAX_ARGS,
1316                         .sys_flags = 0,
1317                         .sys_func = printargs,
1318                         .sys_name = "system call",
1319                 };
1320                 tcp->s_ent = &unknown;
1321                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1322                 if (debug_flag)
1323                         error_msg("pid %d invalid syscall %ld", tcp->pid, tcp->scno);
1324         }
1325         return 1;
1326 }
1327
1328 #ifdef USE_GET_SYSCALL_RESULT_REGS
1329 static int get_syscall_result_regs(struct tcb *);
1330 #endif
1331
1332 /* Returns:
1333  * 1: ok, continue in trace_syscall_exiting().
1334  * -1: error, trace_syscall_exiting() should print error indicator
1335  *    ("????" etc) and bail out.
1336  */
1337 static int
1338 get_syscall_result(struct tcb *tcp)
1339 {
1340 #ifdef USE_GET_SYSCALL_RESULT_REGS
1341         if (get_syscall_result_regs(tcp))
1342                 return -1;
1343 #endif
1344         tcp->u_error = 0;
1345         get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1346
1347         return 1;
1348 }
1349
1350 #include "get_scno.c"
1351 #include "get_syscall_args.c"
1352 #ifdef USE_GET_SYSCALL_RESULT_REGS
1353 # include "get_syscall_result.c"
1354 #endif
1355 #include "get_error.c"
1356 #if defined X86_64 || defined POWERPC
1357 # include "getregs_old.c"
1358 #endif