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