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  * Copyright (c) 1999-2018 The strace developers.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "defs.h"
  36 #include "mmap_cache.h"
  37 #include "native_defs.h"
  38 #include "ptrace.h"
  39 #include "nsig.h"
  40 #include "number_set.h"
  41 #include "retval.h"
  42 #include <limits.h>
  43
  44 /* for struct iovec */
  45 #include <sys/uio.h>
  46
  47 /* for __X32_SYSCALL_BIT */
  48 #include <asm/unistd.h>
  49
  50 #include "regs.h"
  51
  52 #if defined(SPARC64)
  53 # undef PTRACE_GETREGS
  54 # define PTRACE_GETREGS PTRACE_GETREGS64
  55 # undef PTRACE_SETREGS
  56 # define PTRACE_SETREGS PTRACE_SETREGS64
  57 #endif
  58
  59 #ifndef NT_PRSTATUS
  60 # define NT_PRSTATUS 1
  61 #endif
  62
  63 #include "syscall.h"
  64 #include "xstring.h"
  65
  66 /* Define these shorthand notations to simplify the syscallent files. */
  67 #include "sysent_shorthand_defs.h"
  68
  69 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  70
  71 const struct_sysent sysent0[] = {
  72 #include "syscallent.h"
  73 };
  74
  75 #if SUPPORTED_PERSONALITIES > 1
  76 # include PERSONALITY1_INCLUDE_FUNCS
  77 static const struct_sysent sysent1[] = {
  78 # include "syscallent1.h"
  79 };
  80 #endif
  81
  82 #if SUPPORTED_PERSONALITIES > 2
  83 # include PERSONALITY2_INCLUDE_FUNCS
  84 static const struct_sysent sysent2[] = {
  85 # include "syscallent2.h"
  86 };
  87 #endif
  88
  89 /* Now undef them since short defines cause wicked namespace pollution. */
  90 #include "sysent_shorthand_undefs.h"
  91
  92 /*
  93  * `ioctlent[012].h' files are automatically generated by the auxiliary
  94  * program `ioctlsort', such that the list is sorted by the `code' field.
  95  * This has the side-effect of resolving the _IO.. macros into
  96  * plain integers, eliminating the need to include here everything
  97  * in "/usr/include".
  98  */
  99
 100 const char *const errnoent0[] = {
 101 #include "errnoent.h"
 102 };
 103 const char *const signalent0[] = {
 104 #include "signalent.h"
 105 };
 106 const struct_ioctlent ioctlent0[] = {
 107 #include "ioctlent0.h"
 108 };
 109
 110 #if SUPPORTED_PERSONALITIES > 1
 111 static const char *const errnoent1[] = {
 112 # include "errnoent1.h"
 113 };
 114 static const char *const signalent1[] = {
 115 # include "signalent1.h"
 116 };
 117 static const struct_ioctlent ioctlent1[] = {
 118 # include "ioctlent1.h"
 119 };
 120 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 121 static const struct_printers printers0 = {
 122 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 123 };
 124 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 125 static const struct_printers printers1 = {
 126 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 127 };
 128 #endif
 129
 130 #if SUPPORTED_PERSONALITIES > 2
 131 static const char *const errnoent2[] = {
 132 # include "errnoent2.h"
 133 };
 134 static const char *const signalent2[] = {
 135 # include "signalent2.h"
 136 };
 137 static const struct_ioctlent ioctlent2[] = {
 138 # include "ioctlent2.h"
 139 };
 140 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 141 static const struct_printers printers2 = {
 142 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 143 };
 144 #endif
 145
 146 enum {
 147         nsyscalls0 = ARRAY_SIZE(sysent0)
 148 #if SUPPORTED_PERSONALITIES > 1
 149         , nsyscalls1 = ARRAY_SIZE(sysent1)
 150 # if SUPPORTED_PERSONALITIES > 2
 151         , nsyscalls2 = ARRAY_SIZE(sysent2)
 152 # endif
 153 #endif
 154 };
 155
 156 enum {
 157         nerrnos0 = ARRAY_SIZE(errnoent0)
 158 #if SUPPORTED_PERSONALITIES > 1
 159         , nerrnos1 = ARRAY_SIZE(errnoent1)
 160 # if SUPPORTED_PERSONALITIES > 2
 161         , nerrnos2 = ARRAY_SIZE(errnoent2)
 162 # endif
 163 #endif
 164 };
 165
 166 enum {
 167         nsignals0 = ARRAY_SIZE(signalent0)
 168 #if SUPPORTED_PERSONALITIES > 1
 169         , nsignals1 = ARRAY_SIZE(signalent1)
 170 # if SUPPORTED_PERSONALITIES > 2
 171         , nsignals2 = ARRAY_SIZE(signalent2)
 172 # endif
 173 #endif
 174 };
 175
 176 enum {
 177         nioctlents0 = ARRAY_SIZE(ioctlent0)
 178 #if SUPPORTED_PERSONALITIES > 1
 179         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 180 # if SUPPORTED_PERSONALITIES > 2
 181         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 182 # endif
 183 #endif
 184 };
 185
 186 #if SUPPORTED_PERSONALITIES > 1
 187 const struct_sysent *sysent = sysent0;
 188 const char *const *errnoent = errnoent0;
 189 const char *const *signalent = signalent0;
 190 const struct_ioctlent *ioctlent = ioctlent0;
 191 const struct_printers *printers = &printers0;
 192 #endif
 193
 194 unsigned nsyscalls = nsyscalls0;
 195 unsigned nerrnos = nerrnos0;
 196 unsigned nsignals = nsignals0;
 197 unsigned nioctlents = nioctlents0;
 198
 199 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 200         nsyscalls0,
 201 #if SUPPORTED_PERSONALITIES > 1
 202         nsyscalls1,
 203 #endif
 204 #if SUPPORTED_PERSONALITIES > 2
 205         nsyscalls2,
 206 #endif
 207 };
 208 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 209         sysent0,
 210 #if SUPPORTED_PERSONALITIES > 1
 211         sysent1,
 212 #endif
 213 #if SUPPORTED_PERSONALITIES > 2
 214         sysent2,
 215 #endif
 216 };
 217
 218 const char *const personality_names[] =
 219 # if defined X86_64
 220         {"64 bit", "32 bit", "x32"}
 221 # elif defined X32
 222         {"x32", "32 bit"}
 223 # elif SUPPORTED_PERSONALITIES == 2
 224         {"64 bit", "32 bit"}
 225 # else
 226         {STRINGIFY_VAL(__WORDSIZE) " bit"}
 227 # endif
 228         ;
 229
 230 #if SUPPORTED_PERSONALITIES > 1
 231
 232 unsigned current_personality;
 233
 234 # ifndef current_wordsize
 235 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
 236 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 237         PERSONALITY0_WORDSIZE,
 238         PERSONALITY1_WORDSIZE,
 239 # if SUPPORTED_PERSONALITIES > 2
 240         PERSONALITY2_WORDSIZE,
 241 # endif
 242 };
 243 # endif
 244
 245 # ifndef current_klongsize
 246 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
 247 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
 248         PERSONALITY0_KLONGSIZE,
 249         PERSONALITY1_KLONGSIZE,
 250 #  if SUPPORTED_PERSONALITIES > 2
 251         PERSONALITY2_KLONGSIZE,
 252 #  endif
 253 };
 254 # endif
 255
 256 void
 257 set_personality(unsigned int personality)
 258 {
 259         if (personality == current_personality)
 260                 return;
 261
 262         if (personality >= SUPPORTED_PERSONALITIES)
 263                 error_msg_and_die("Requested switch to unsupported personality "
 264                                   "%u", personality);
 265
 266         nsyscalls = nsyscall_vec[personality];
 267         sysent = sysent_vec[personality];
 268
 269         switch (personality) {
 270         case 0:
 271                 errnoent = errnoent0;
 272                 nerrnos = nerrnos0;
 273                 ioctlent = ioctlent0;
 274                 nioctlents = nioctlents0;
 275                 signalent = signalent0;
 276                 nsignals = nsignals0;
 277                 printers = &printers0;
 278                 break;
 279
 280         case 1:
 281                 errnoent = errnoent1;
 282                 nerrnos = nerrnos1;
 283                 ioctlent = ioctlent1;
 284                 nioctlents = nioctlents1;
 285                 signalent = signalent1;
 286                 nsignals = nsignals1;
 287                 printers = &printers1;
 288                 break;
 289
 290 # if SUPPORTED_PERSONALITIES > 2
 291         case 2:
 292                 errnoent = errnoent2;
 293                 nerrnos = nerrnos2;
 294                 ioctlent = ioctlent2;
 295                 nioctlents = nioctlents2;
 296                 signalent = signalent2;
 297                 nsignals = nsignals2;
 298                 printers = &printers2;
 299                 break;
 300 # endif
 301         }
 302
 303         current_personality = personality;
 304 # ifndef current_wordsize
 305         current_wordsize = personality_wordsize[personality];
 306 # endif
 307 # ifndef current_klongsize
 308         current_klongsize = personality_klongsize[personality];
 309 # endif
 310 }
 311
 312 static void
 313 update_personality(struct tcb *tcp, unsigned int personality)
 314 {
 315         static bool need_mpers_warning[] =
 316                 { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
 317
 318         set_personality(personality);
 319
 320         if (personality == tcp->currpers)
 321                 return;
 322         tcp->currpers = personality;
 323
 324         if (!qflag) {
 325                 error_msg("[ Process PID=%d runs in %s mode. ]",
 326                           tcp->pid, personality_names[personality]);
 327         }
 328
 329         if (need_mpers_warning[personality]) {
 330                 error_msg("WARNING: Proper structure decoding for this "
 331                           "personality is not supported, please consider "
 332                           "building strace with mpers support enabled.");
 333                 need_mpers_warning[personality] = false;
 334         }
 335 }
 336 #endif
 337
 338 #ifdef SYS_socket_subcall
 339 static void
 340 decode_socket_subcall(struct tcb *tcp)
 341 {
 342         const int call = tcp->u_arg[0];
 343
 344         if (call < 1 || call >= SYS_socket_nsubcalls)
 345                 return;
 346
 347         const kernel_ulong_t scno = SYS_socket_subcall + call;
 348         const unsigned int nargs = sysent[scno].nargs;
 349         uint64_t buf[nargs];
 350
 351         if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
 352                 return;
 353
 354         tcp->scno = scno;
 355         tcp->qual_flg = qual_flags(scno);
 356         tcp->s_ent = &sysent[scno];
 357
 358         unsigned int i;
 359         for (i = 0; i < nargs; ++i)
 360                 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
 361                                 ? ((uint32_t *) (void *) buf)[i] : buf[i];
 362 }
 363 #endif /* SYS_socket_subcall */
 364
 365 #ifdef SYS_ipc_subcall
 366 static void
 367 decode_ipc_subcall(struct tcb *tcp)
 368 {
 369         unsigned int call = tcp->u_arg[0];
 370         const unsigned int version = call >> 16;
 371
 372         if (version) {
 373 # if defined S390 || defined S390X
 374                 return;
 375 # else
 376 #  ifdef SPARC64
 377                 if (current_wordsize == 8)
 378                         return;
 379 #  endif
 380                 set_tcb_priv_ulong(tcp, version);
 381                 call &= 0xffff;
 382 # endif
 383         }
 384
 385         switch (call) {
 386                 case  1: case  2: case  3: case  4:
 387                 case 11: case 12: case 13: case 14:
 388                 case 21: case 22: case 23: case 24:
 389                         break;
 390                 default:
 391                         return;
 392         }
 393
 394         tcp->scno = SYS_ipc_subcall + call;
 395         tcp->qual_flg = qual_flags(tcp->scno);
 396         tcp->s_ent = &sysent[tcp->scno];
 397
 398         const unsigned int n = tcp->s_ent->nargs;
 399         unsigned int i;
 400         for (i = 0; i < n; i++)
 401                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 402 }
 403 #endif /* SYS_ipc_subcall */
 404
 405 #ifdef SYS_syscall_subcall
 406 static void
 407 decode_syscall_subcall(struct tcb *tcp)
 408 {
 409         if (!scno_is_valid(tcp->u_arg[0]))
 410                 return;
 411         tcp->scno = tcp->u_arg[0];
 412         tcp->qual_flg = qual_flags(tcp->scno);
 413         tcp->s_ent = &sysent[tcp->scno];
 414         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 415                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 416 # ifdef LINUX_MIPSO32
 417         /*
 418          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 419          * and sync_file_range) requires additional code,
 420          * see linux/mips/get_syscall_args.c
 421          */
 422         if (tcp->s_ent->nargs == MAX_ARGS) {
 423                 if (umoven(tcp,
 424                            mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
 425                            sizeof(tcp->u_arg[0]),
 426                            &tcp->u_arg[MAX_ARGS - 1]) < 0)
 427                 tcp->u_arg[MAX_ARGS - 1] = 0;
 428         }
 429 # endif /* LINUX_MIPSO32 */
 430 }
 431 #endif /* SYS_syscall_subcall */
 432
 433 static void
 434 dumpio(struct tcb *tcp)
 435 {
 436         if (syserror(tcp))
 437                 return;
 438
 439         int fd = tcp->u_arg[0];
 440         if (fd < 0)
 441                 return;
 442
 443         if (is_number_in_set(fd, read_set)) {
 444                 switch (tcp->s_ent->sen) {
 445                 case SEN_read:
 446                 case SEN_pread:
 447                 case SEN_recv:
 448                 case SEN_recvfrom:
 449                 case SEN_mq_timedreceive:
 450                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 451                         return;
 452                 case SEN_readv:
 453                 case SEN_preadv:
 454                 case SEN_preadv2:
 455                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 456                                      tcp->u_rval);
 457                         return;
 458                 case SEN_recvmsg:
 459                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
 460                         return;
 461                 case SEN_recvmmsg:
 462                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 463                         return;
 464                 }
 465         }
 466         if (is_number_in_set(fd, write_set)) {
 467                 switch (tcp->s_ent->sen) {
 468                 case SEN_write:
 469                 case SEN_pwrite:
 470                 case SEN_send:
 471                 case SEN_sendto:
 472                 case SEN_mq_timedsend:
 473                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 474                         break;
 475                 case SEN_writev:
 476                 case SEN_pwritev:
 477                 case SEN_pwritev2:
 478                 case SEN_vmsplice:
 479                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
 480                         break;
 481                 case SEN_sendmsg:
 482                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
 483                         break;
 484                 case SEN_sendmmsg:
 485                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 486                         break;
 487                 }
 488         }
 489 }
 490
 491 const char *
 492 err_name(unsigned long err)
 493 {
 494         if ((err < nerrnos) && errnoent[err])
 495                 return errnoent[err];
 496
 497         return NULL;
 498 }
 499
 500 static long get_regs(struct tcb *);
 501 static int get_syscall_args(struct tcb *);
 502 static int get_syscall_result(struct tcb *);
 503 static int arch_get_scno(struct tcb *tcp);
 504 static int arch_set_scno(struct tcb *, kernel_ulong_t);
 505 static void get_error(struct tcb *, const bool);
 506 static int arch_set_error(struct tcb *);
 507 static int arch_set_success(struct tcb *);
 508
 509 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
 510
 511 static struct inject_opts *
 512 tcb_inject_opts(struct tcb *tcp)
 513 {
 514         return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
 515                ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
 516 }
 517
 518
 519 static long
 520 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
 521 {
 522         if (!tcp->inject_vec[current_personality]) {
 523                 tcp->inject_vec[current_personality] =
 524                         xcalloc(nsyscalls, sizeof(**inject_vec));
 525                 memcpy(tcp->inject_vec[current_personality],
 526                        inject_vec[current_personality],
 527                        nsyscalls * sizeof(**inject_vec));
 528         }
 529
 530         struct inject_opts *opts = tcb_inject_opts(tcp);
 531
 532         if (!opts || opts->first == 0)
 533                 return 0;
 534
 535         --opts->first;
 536
 537         if (opts->first != 0)
 538                 return 0;
 539
 540         opts->first = opts->step;
 541
 542         if (!recovering(tcp)) {
 543                 if (opts->data.flags & INJECT_F_SIGNAL)
 544                         *signo = opts->data.signo;
 545                 if (opts->data.flags & INJECT_F_RETVAL &&
 546                     !arch_set_scno(tcp, -1))
 547                         tcp->flags |= TCB_TAMPERED;
 548                 if (opts->data.flags & INJECT_F_DELAY_ENTER)
 549                         delay_tcb(tcp, opts->data.delay_idx, true);
 550                 if (opts->data.flags & INJECT_F_DELAY_EXIT)
 551                         tcp->flags |= TCB_INJECT_DELAY_EXIT;
 552         }
 553
 554         return 0;
 555 }
 556
 557 static long
 558 tamper_with_syscall_exiting(struct tcb *tcp)
 559 {
 560         struct inject_opts *opts = tcb_inject_opts(tcp);
 561         if (!opts)
 562                 return 0;
 563
 564         if (inject_delay_exit(tcp))
 565                 delay_tcb(tcp, opts->data.delay_idx, false);
 566
 567         if (!syscall_tampered(tcp))
 568                 return 0;
 569
 570         if (!syserror(tcp)) {
 571                 error_msg("Failed to tamper with process %d: got no error "
 572                           "(return value %#" PRI_klx ")",
 573                           tcp->pid, tcp->u_rval);
 574
 575                 return 1;
 576         }
 577
 578         bool update_tcb = false;
 579
 580         const kernel_long_t inject_rval = retval_get(opts->data.rval_idx);
 581         if (inject_rval >= 0) {
 582                 kernel_long_t u_rval = tcp->u_rval;
 583
 584                 tcp->u_rval = inject_rval;
 585                 if (arch_set_success(tcp)) {
 586                         tcp->u_rval = u_rval;
 587                 } else {
 588                         update_tcb = true;
 589                         tcp->u_error = 0;
 590                 }
 591         } else {
 592                 unsigned long new_error = -inject_rval;
 593
 594                 if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
 595                         unsigned long u_error = tcp->u_error;
 596
 597                         tcp->u_error = new_error;
 598                         if (arch_set_error(tcp)) {
 599                                 tcp->u_error = u_error;
 600                         } else {
 601                                 update_tcb = true;
 602                         }
 603                 }
 604         }
 605
 606         if (update_tcb) {
 607                 tcp->u_error = 0;
 608                 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
 609         }
 610
 611         return 0;
 612 }
 613
 614 /*
 615  * Returns:
 616  * 0: "ignore this ptrace stop", bail out silently.
 617  * 1: ok, decoded; call
 618  *    syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
 619  * other: error; call syscall_entering_finish(tcp, res), where res is the value
 620  *    returned.
 621  */
 622 int
 623 syscall_entering_decode(struct tcb *tcp)
 624 {
 625         int res = get_scno(tcp);
 626         if (res == 0)
 627                 return res;
 628         int scno_good = res;
 629         if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
 630                 printleader(tcp);
 631                 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
 632                 /*
 633                  * " <unavailable>" will be added later by the code which
 634                  * detects ptrace errors.
 635                  */
 636                 return res;
 637         }
 638
 639 #if defined SYS_ipc_subcall     \
 640  || defined SYS_socket_subcall  \
 641  || defined SYS_syscall_subcall
 642         for (;;) {
 643                 switch (tcp->s_ent->sen) {
 644 # ifdef SYS_ipc_subcall
 645                 case SEN_ipc:
 646                         decode_ipc_subcall(tcp);
 647                         break;
 648 # endif
 649 # ifdef SYS_socket_subcall
 650                 case SEN_socketcall:
 651                         decode_socket_subcall(tcp);
 652                         break;
 653 # endif
 654 # ifdef SYS_syscall_subcall
 655                 case SEN_syscall:
 656                         decode_syscall_subcall(tcp);
 657                         if (tcp->s_ent->sen != SEN_syscall)
 658                                 continue;
 659                         break;
 660 # endif
 661                 }
 662                 break;
 663         }
 664 #endif
 665
 666         return 1;
 667 }
 668
 669 int
 670 syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
 671 {
 672         /* Restrain from fault injection while the trace executes strace code. */
 673         if (hide_log(tcp)) {
 674                 tcp->qual_flg &= ~QUAL_INJECT;
 675         }
 676
 677         switch (tcp->s_ent->sen) {
 678                 case SEN_execve:
 679                 case SEN_execveat:
 680 #if defined SPARC || defined SPARC64
 681                 case SEN_execv:
 682 #endif
 683                         tcp->flags &= ~TCB_HIDE_LOG;
 684                         break;
 685         }
 686
 687         if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
 688                 tcp->flags |= TCB_FILTERED;
 689                 return 0;
 690         }
 691
 692         tcp->flags &= ~TCB_FILTERED;
 693
 694         if (hide_log(tcp)) {
 695                 return 0;
 696         }
 697
 698         if (inject(tcp))
 699                 tamper_with_syscall_entering(tcp, sig);
 700
 701         if (cflag == CFLAG_ONLY_STATS) {
 702                 return 0;
 703         }
 704
 705 #ifdef USE_LIBUNWIND
 706         if (stack_trace_enabled) {
 707                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 708                         unwind_capture_stacktrace(tcp);
 709         }
 710 #endif
 711
 712         printleader(tcp);
 713         tprintf("%s(", tcp->s_ent->sys_name);
 714         int res = raw(tcp) ? printargs(tcp) : tcp->s_ent->sys_func(tcp);
 715         fflush(tcp->outf);
 716         return res;
 717 }
 718
 719 void
 720 syscall_entering_finish(struct tcb *tcp, int res)
 721 {
 722         tcp->flags |= TCB_INSYSCALL;
 723         tcp->sys_func_rval = res;
 724         /* Measure the entrance time as late as possible to avoid errors. */
 725         if ((Tflag || cflag) && !filtered(tcp))
 726                 clock_gettime(CLOCK_MONOTONIC, &tcp->etime);
 727 }
 728
 729 /* Returns:
 730  * 0: "bail out".
 731  * 1: ok.
 732  * -1: error in one of ptrace ops.
 733  *
 734  * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
 735  *    value. Anyway, call syscall_exiting_finish(tcp) then.
 736  */
 737 int
 738 syscall_exiting_decode(struct tcb *tcp, struct timespec *pts)
 739 {
 740         /* Measure the exit time as early as possible to avoid errors. */
 741         if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
 742                 clock_gettime(CLOCK_MONOTONIC, pts);
 743
 744         if (mmap_cache_is_enabled()) {
 745                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 746                         mmap_cache_invalidate(tcp);
 747         }
 748
 749         if (filtered(tcp) || hide_log(tcp))
 750                 return 0;
 751
 752 #if SUPPORTED_PERSONALITIES > 1
 753         update_personality(tcp, tcp->currpers);
 754 #endif
 755
 756         return get_syscall_result(tcp);
 757 }
 758
 759 int
 760 syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res)
 761 {
 762         if (syscall_tampered(tcp) || inject_delay_exit(tcp))
 763                 tamper_with_syscall_exiting(tcp);
 764
 765         if (cflag) {
 766                 count_syscall(tcp, ts);
 767                 if (cflag == CFLAG_ONLY_STATS) {
 768                         return 0;
 769                 }
 770         }
 771
 772         /* If not in -ff mode, and printing_tcp != tcp,
 773          * then the log currently does not end with output
 774          * of _our syscall entry_, but with something else.
 775          * We need to say which syscall's return is this.
 776          *
 777          * Forced reprinting via TCB_REPRINT is used only by
 778          * "strace -ff -oLOG test/threaded_execve" corner case.
 779          * It's the only case when -ff mode needs reprinting.
 780          */
 781         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 782                 tcp->flags &= ~TCB_REPRINT;
 783                 printleader(tcp);
 784                 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 785         }
 786         printing_tcp = tcp;
 787
 788         tcp->s_prev_ent = NULL;
 789         if (res != 1) {
 790                 /* There was error in one of prior ptrace ops */
 791                 tprints(") ");
 792                 tabto();
 793                 tprints("= ? <unavailable>\n");
 794                 line_ended();
 795                 return res;
 796         }
 797         tcp->s_prev_ent = tcp->s_ent;
 798
 799         int sys_res = 0;
 800         if (raw(tcp)) {
 801                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 802         } else {
 803         /* FIXME: not_failing_only (IOW, option -z) is broken:
 804          * failure of syscall is known only after syscall return.
 805          * Thus we end up with something like this on, say, ENOENT:
 806          *     open("does_not_exist", O_RDONLY <unfinished ...>
 807          *     {next syscall decode}
 808          * whereas the intended result is that open(...) line
 809          * is not shown at all.
 810          */
 811                 if (not_failing_only && tcp->u_error)
 812                         return 0;       /* ignore failed syscalls */
 813                 if (tcp->sys_func_rval & RVAL_DECODED)
 814                         sys_res = tcp->sys_func_rval;
 815                 else
 816                         sys_res = tcp->s_ent->sys_func(tcp);
 817         }
 818
 819         tprints(") ");
 820         tabto();
 821         unsigned long u_error = tcp->u_error;
 822         kernel_long_t u_rval;
 823
 824         if (raw(tcp)) {
 825                 if (u_error) {
 826                         tprintf("= -1 (errno %lu)", u_error);
 827                 } else {
 828                         tprintf("= %#" PRI_klx, tcp->u_rval);
 829                 }
 830                 if (syscall_tampered(tcp))
 831                         tprints(" (INJECTED)");
 832         } else if (!(sys_res & RVAL_NONE) && u_error) {
 833                 const char *u_error_str;
 834
 835                 switch (u_error) {
 836                 /* Blocked signals do not interrupt any syscalls.
 837                  * In this case syscalls don't return ERESTARTfoo codes.
 838                  *
 839                  * Deadly signals set to SIG_DFL interrupt syscalls
 840                  * and kill the process regardless of which of the codes below
 841                  * is returned by the interrupted syscall.
 842                  * In some cases, kernel forces a kernel-generated deadly
 843                  * signal to be unblocked and set to SIG_DFL (and thus cause
 844                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 845                  * or SIGILL. (The alternative is to leave process spinning
 846                  * forever on the faulty instruction - not useful).
 847                  *
 848                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 849                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 850                  * but kernel will always restart them.
 851                  */
 852                 case ERESTARTSYS:
 853                         /* Most common type of signal-interrupted syscall exit code.
 854                          * The system call will be restarted with the same arguments
 855                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 856                          */
 857                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 858                         break;
 859                 case ERESTARTNOINTR:
 860                         /* Rare. For example, fork() returns this if interrupted.
 861                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 862                          */
 863                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 864                         break;
 865                 case ERESTARTNOHAND:
 866                         /* pause(), rt_sigsuspend() etc use this code.
 867                          * SA_RESTART is ignored (assumed not set):
 868                          * syscall won't restart (will return EINTR instead)
 869                          * even after signal with SA_RESTART set. However,
 870                          * after SIG_IGN or SIG_DFL signal it will restart
 871                          * (thus the name "restart only if has no handler").
 872                          */
 873                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 874                         break;
 875                 case ERESTART_RESTARTBLOCK:
 876                         /* Syscalls like nanosleep(), poll() which can't be
 877                          * restarted with their original arguments use this
 878                          * code. Kernel will execute restart_syscall() instead,
 879                          * which changes arguments before restarting syscall.
 880                          * SA_RESTART is ignored (assumed not set) similarly
 881                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 882                          * since restart data is saved in "restart block"
 883                          * in task struct, and if signal handler uses a syscall
 884                          * which in turn saves another such restart block,
 885                          * old data is lost and restart becomes impossible)
 886                          */
 887                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 888                         break;
 889                 default:
 890                         u_rval = sys_res & RVAL_PRINT_ERR_VAL ?
 891                                  tcp->u_rval : -1;
 892                         u_error_str = err_name(u_error);
 893                         if (u_error_str)
 894                                 tprintf("= %" PRI_kld " %s (%s)",
 895                                         u_rval, u_error_str, strerror(u_error));
 896                         else
 897                                 tprintf("= %" PRI_kld " %lu (%s)",
 898                                         u_rval, u_error, strerror(u_error));
 899                         break;
 900                 }
 901                 if (syscall_tampered(tcp))
 902                         tprints(" (INJECTED)");
 903                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 904                         tprintf(" (%s)", tcp->auxstr);
 905         } else {
 906                 if (sys_res & RVAL_NONE)
 907                         tprints("= ?");
 908                 else {
 909                         switch (sys_res & RVAL_MASK) {
 910                         case RVAL_HEX:
 911 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 912                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 913                                         tprintf("= %#x",
 914                                                 (unsigned int) tcp->u_rval);
 915                                 } else
 916 #endif
 917                                 {
 918                                         tprintf("= %#" PRI_klx, tcp->u_rval);
 919                                 }
 920                                 break;
 921                         case RVAL_OCTAL:
 922                                 tprints("= ");
 923                                 print_numeric_long_umask(tcp->u_rval);
 924                                 break;
 925                         case RVAL_UDECIMAL:
 926 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 927                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 928                                         tprintf("= %u",
 929                                                 (unsigned int) tcp->u_rval);
 930                                 } else
 931 #endif
 932                                 {
 933                                         tprintf("= %" PRI_klu, tcp->u_rval);
 934                                 }
 935                                 break;
 936                         case RVAL_DECIMAL:
 937                                 tprintf("= %" PRI_kld, tcp->u_rval);
 938                                 break;
 939                         case RVAL_FD:
 940                                 if (show_fd_path) {
 941                                         tprints("= ");
 942                                         printfd(tcp, tcp->u_rval);
 943                                 } else
 944                                         tprintf("= %" PRI_kld, tcp->u_rval);
 945                                 break;
 946                         default:
 947                                 error_msg("invalid rval format");
 948                                 break;
 949                         }
 950                 }
 951                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 952                         tprintf(" (%s)", tcp->auxstr);
 953                 if (syscall_tampered(tcp))
 954                         tprints(" (INJECTED)");
 955         }
 956         if (Tflag) {
 957                 ts_sub(ts, ts, &tcp->etime);
 958                 tprintf(" <%ld.%06ld>",
 959                         (long) ts->tv_sec, (long) ts->tv_nsec / 1000);
 960         }
 961         tprints("\n");
 962         dumpio(tcp);
 963         line_ended();
 964
 965 #ifdef USE_LIBUNWIND
 966         if (stack_trace_enabled)
 967                 unwind_print_stacktrace(tcp);
 968 #endif
 969         return 0;
 970 }
 971
 972 void
 973 syscall_exiting_finish(struct tcb *tcp)
 974 {
 975         tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED | TCB_INJECT_DELAY_EXIT);
 976         tcp->sys_func_rval = 0;
 977         free_tcb_priv_data(tcp);
 978 }
 979
 980 bool
 981 is_erestart(struct tcb *tcp)
 982 {
 983         switch (tcp->u_error) {
 984                 case ERESTARTSYS:
 985                 case ERESTARTNOINTR:
 986                 case ERESTARTNOHAND:
 987                 case ERESTART_RESTARTBLOCK:
 988                         return true;
 989                 default:
 990                         return false;
 991         }
 992 }
 993
 994 static unsigned long saved_u_error;
 995
 996 void
 997 temporarily_clear_syserror(struct tcb *tcp)
 998 {
 999         saved_u_error = tcp->u_error;
1000         tcp->u_error = 0;
1001 }
1002
1003 void
1004 restore_cleared_syserror(struct tcb *tcp)
1005 {
1006         tcp->u_error = saved_u_error;
1007 }
1008
1009 #include "arch_regs.c"
1010
1011 #if HAVE_ARCH_GETRVAL2
1012 # include "arch_getrval2.c"
1013 #endif
1014
1015 void
1016 print_pc(struct tcb *tcp)
1017 {
1018 #if defined ARCH_PC_REG
1019 # define ARCH_GET_PC 0
1020 #elif defined ARCH_PC_PEEK_ADDR
1021         kernel_ulong_t pc;
1022 # define ARCH_PC_REG pc
1023 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
1024 #else
1025 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1026 #endif
1027         if (get_regs(tcp) < 0 || ARCH_GET_PC)
1028                 tprints(current_wordsize == 4 ? "[????????] "
1029                                               : "[????????????????] ");
1030         else
1031                 tprintf(current_wordsize == 4
1032                         ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1033                         (kernel_ulong_t) ARCH_PC_REG);
1034 }
1035
1036 #include "getregs_old.h"
1037
1038 #undef ptrace_getregset_or_getregs
1039 #undef ptrace_setregset_or_setregs
1040 #ifdef ARCH_REGS_FOR_GETREGSET
1041
1042 # define ptrace_getregset_or_getregs ptrace_getregset
1043 static long
1044 ptrace_getregset(pid_t pid)
1045 {
1046 # ifdef ARCH_IOVEC_FOR_GETREGSET
1047         /* variable iovec */
1048         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1049         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1050                       &ARCH_IOVEC_FOR_GETREGSET);
1051 # else
1052         /* constant iovec */
1053         static struct iovec io = {
1054                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1055                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1056         };
1057         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1058
1059 # endif
1060 }
1061
1062 # ifndef HAVE_GETREGS_OLD
1063 #  define ptrace_setregset_or_setregs ptrace_setregset
1064 static int
1065 ptrace_setregset(pid_t pid)
1066 {
1067 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1068         /* variable iovec */
1069         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1070                       &ARCH_IOVEC_FOR_GETREGSET);
1071 #  else
1072         /* constant iovec */
1073         static struct iovec io = {
1074                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1075                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1076         };
1077         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1078 #  endif
1079 }
1080 # endif /* !HAVE_GETREGS_OLD */
1081
1082 #elif defined ARCH_REGS_FOR_GETREGS
1083
1084 # define ptrace_getregset_or_getregs ptrace_getregs
1085 static long
1086 ptrace_getregs(pid_t pid)
1087 {
1088 # if defined SPARC || defined SPARC64
1089         /* SPARC systems have the meaning of data and addr reversed */
1090         return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1091 # else
1092         return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1093 # endif
1094 }
1095
1096 # ifndef HAVE_GETREGS_OLD
1097 #  define ptrace_setregset_or_setregs ptrace_setregs
1098 static int
1099 ptrace_setregs(pid_t pid)
1100 {
1101 #  if defined SPARC || defined SPARC64
1102         /* SPARC systems have the meaning of data and addr reversed */
1103         return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1104 #  else
1105         return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1106 #  endif
1107 }
1108 # endif /* !HAVE_GETREGS_OLD */
1109
1110 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1111
1112 #ifdef ptrace_getregset_or_getregs
1113 static long get_regs_error;
1114 #endif
1115
1116 void
1117 clear_regs(struct tcb *tcp)
1118 {
1119 #ifdef ptrace_getregset_or_getregs
1120         get_regs_error = -1;
1121 #endif
1122 }
1123
1124 static long
1125 get_regs(struct tcb *const tcp)
1126 {
1127 #ifdef ptrace_getregset_or_getregs
1128
1129         if (get_regs_error != -1)
1130                 return get_regs_error;
1131
1132 # ifdef HAVE_GETREGS_OLD
1133         /*
1134          * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1135          * fallback to getregs_old.
1136          */
1137         static int use_getregs_old;
1138         if (use_getregs_old < 0) {
1139                 return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1140         } else if (use_getregs_old == 0) {
1141                 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1142                 if (get_regs_error >= 0) {
1143                         use_getregs_old = -1;
1144                         return get_regs_error;
1145                 }
1146                 if (errno == EPERM || errno == ESRCH)
1147                         return get_regs_error;
1148                 use_getregs_old = 1;
1149         }
1150         return get_regs_error = getregs_old(tcp);
1151 # else /* !HAVE_GETREGS_OLD */
1152         /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1153         get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1154
1155 #  if defined ARCH_PERSONALITY_0_IOV_SIZE
1156         if (get_regs_error)
1157                 return get_regs_error;
1158
1159         switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1160         case ARCH_PERSONALITY_0_IOV_SIZE:
1161                 update_personality(tcp, 0);
1162                 break;
1163         case ARCH_PERSONALITY_1_IOV_SIZE:
1164                 update_personality(tcp, 1);
1165                 break;
1166         default: {
1167                 static bool printed = false;
1168
1169                 if (!printed) {
1170                         error_msg("Unsupported regset size returned by "
1171                                   "PTRACE_GETREGSET: %zu",
1172                                   ARCH_IOVEC_FOR_GETREGSET.iov_len);
1173
1174                         printed = true;
1175                 }
1176
1177                 update_personality(tcp, 0);
1178         }
1179         }
1180 #  endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1181
1182         return get_regs_error;
1183
1184 # endif /* !HAVE_GETREGS_OLD */
1185
1186 #else /* !ptrace_getregset_or_getregs */
1187
1188 # warning get_regs is not implemented for this architecture yet
1189         return 0;
1190
1191 #endif /* !ptrace_getregset_or_getregs */
1192 }
1193
1194 #ifdef ptrace_setregset_or_setregs
1195 static int
1196 set_regs(pid_t pid)
1197 {
1198         return ptrace_setregset_or_setregs(pid);
1199 }
1200 #endif /* ptrace_setregset_or_setregs */
1201
1202 struct sysent_buf {
1203         struct tcb *tcp;
1204         struct_sysent ent;
1205         char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
1206 };
1207
1208 static void
1209 free_sysent_buf(void *ptr)
1210 {
1211         struct sysent_buf *s = ptr;
1212         s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1213         free(ptr);
1214 }
1215
1216 /*
1217  * Returns:
1218  * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1219  *    out silently" code.
1220  * 1: ok, continue in syscall_entering_decode().
1221  * other: error, syscall_entering_decode() should print error indicator
1222  *    ("????" etc) and return an appropriate code.
1223  */
1224 int
1225 get_scno(struct tcb *tcp)
1226 {
1227         if (get_regs(tcp) < 0)
1228                 return -1;
1229
1230         int rc = arch_get_scno(tcp);
1231         if (rc != 1)
1232                 return rc;
1233
1234         tcp->scno = shuffle_scno(tcp->scno);
1235
1236         if (scno_is_valid(tcp->scno)) {
1237                 tcp->s_ent = &sysent[tcp->scno];
1238                 tcp->qual_flg = qual_flags(tcp->scno);
1239         } else {
1240                 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1241
1242                 s->tcp = tcp;
1243                 s->ent.nargs = MAX_ARGS;
1244                 s->ent.sen = SEN_printargs;
1245                 s->ent.sys_func = printargs;
1246                 s->ent.sys_name = s->buf;
1247                 xsprintf(s->buf, "syscall_%#" PRI_klx, shuffle_scno(tcp->scno));
1248
1249                 tcp->s_ent = &s->ent;
1250                 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1251
1252                 set_tcb_priv_data(tcp, s, free_sysent_buf);
1253
1254                 debug_msg("pid %d invalid syscall %#" PRI_klx,
1255                           tcp->pid, shuffle_scno(tcp->scno));
1256         }
1257
1258         /*
1259          * We refrain from argument decoding during recovering
1260          * as tracee memory mappings has changed and the registers
1261          * are very likely pointing to garbage already.
1262          */
1263         if (recovering(tcp))
1264                 tcp->qual_flg |= QUAL_RAW;
1265
1266         return 1;
1267 }
1268
1269 #ifdef ptrace_getregset_or_getregs
1270 # define get_syscall_result_regs get_regs
1271 #else
1272 static int get_syscall_result_regs(struct tcb *);
1273 #endif
1274
1275 /* Returns:
1276  * 1: ok, continue in syscall_exiting_trace().
1277  * -1: error, syscall_exiting_trace() should print error indicator
1278  *    ("????" etc) and bail out.
1279  */
1280 static int
1281 get_syscall_result(struct tcb *tcp)
1282 {
1283         if (get_syscall_result_regs(tcp) < 0)
1284                 return -1;
1285         tcp->u_error = 0;
1286         get_error(tcp,
1287                   !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
1288                         || syscall_tampered(tcp));
1289
1290         return 1;
1291 }
1292
1293 #include "get_scno.c"
1294 #include "set_scno.c"
1295 #include "get_syscall_args.c"
1296 #ifndef ptrace_getregset_or_getregs
1297 # include "get_syscall_result.c"
1298 #endif
1299 #include "get_error.c"
1300 #include "set_error.c"
1301 #ifdef HAVE_GETREGS_OLD
1302 # include "getregs_old.c"
1303 #endif
1304 #include "shuffle_scno.c"
1305
1306 const char *
1307 syscall_name(kernel_ulong_t scno)
1308 {
1309         return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
1310 }