granicus.if.org Git - strace/blob - syscall.c

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "defs.h"
  35 #include "native_defs.h"
  36 #include "nsig.h"
  37 #include <sys/param.h>
  38
  39 /* for struct iovec */
  40 #include <sys/uio.h>
  41
  42 /* for __X32_SYSCALL_BIT */
  43 #include <asm/unistd.h>
  44
  45 #include "regs.h"
  46 #include "ptrace.h"
  47
  48 #if defined(SPARC64)
  49 # undef PTRACE_GETREGS
  50 # define PTRACE_GETREGS PTRACE_GETREGS64
  51 # undef PTRACE_SETREGS
  52 # define PTRACE_SETREGS PTRACE_SETREGS64
  53 #endif
  54
  55 #if defined SPARC64
  56 # include <asm/psrcompat.h>
  57 #elif defined SPARC
  58 # include <asm/psr.h>
  59 #endif
  60
  61 #ifdef IA64
  62 # include <asm/rse.h>
  63 #endif
  64
  65 #ifndef NT_PRSTATUS
  66 # define NT_PRSTATUS 1
  67 #endif
  68
  69 #include "syscall.h"
  70
  71 /* Define these shorthand notations to simplify the syscallent files. */
  72 #define TD TRACE_DESC
  73 #define TF TRACE_FILE
  74 #define TI TRACE_IPC
  75 #define TN TRACE_NETWORK
  76 #define TP TRACE_PROCESS
  77 #define TS TRACE_SIGNAL
  78 #define TM TRACE_MEMORY
  79 #define TSC TRACE_SCHED
  80 #define TCL TRACE_CLOCK
  81 #define TSF TRACE_STATFS
  82 #define NF SYSCALL_NEVER_FAILS
  83 #define MA MAX_ARGS
  84 #define SI STACKTRACE_INVALIDATE_CACHE
  85 #define SE STACKTRACE_CAPTURE_ON_ENTER
  86 #define CST COMPAT_SYSCALL_TYPES
  87
  88 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  89
  90 const struct_sysent sysent0[] = {
  91 #include "syscallent.h"
  92 };
  93
  94 #if SUPPORTED_PERSONALITIES > 1
  95 # include PERSONALITY1_INCLUDE_FUNCS
  96 static const struct_sysent sysent1[] = {
  97 # include "syscallent1.h"
  98 };
  99 #endif
 100
 101 #if SUPPORTED_PERSONALITIES > 2
 102 # include PERSONALITY2_INCLUDE_FUNCS
 103 static const struct_sysent sysent2[] = {
 104 # include "syscallent2.h"
 105 };
 106 #endif
 107
 108 /* Now undef them since short defines cause wicked namespace pollution. */
 109 #undef SEN
 110 #undef TD
 111 #undef TF
 112 #undef TI
 113 #undef TN
 114 #undef TP
 115 #undef TS
 116 #undef TM
 117 #undef TSC
 118 #undef TCL
 119 #undef TSF
 120 #undef NF
 121 #undef MA
 122 #undef SI
 123 #undef SE
 124 #undef CST
 125
 126 /*
 127  * `ioctlent[012].h' files are automatically generated by the auxiliary
 128  * program `ioctlsort', such that the list is sorted by the `code' field.
 129  * This has the side-effect of resolving the _IO.. macros into
 130  * plain integers, eliminating the need to include here everything
 131  * in "/usr/include".
 132  */
 133
 134 const char *const errnoent0[] = {
 135 #include "errnoent.h"
 136 };
 137 const char *const signalent0[] = {
 138 #include "signalent.h"
 139 };
 140 const struct_ioctlent ioctlent0[] = {
 141 #include "ioctlent0.h"
 142 };
 143
 144 #if SUPPORTED_PERSONALITIES > 1
 145 static const char *const errnoent1[] = {
 146 # include "errnoent1.h"
 147 };
 148 static const char *const signalent1[] = {
 149 # include "signalent1.h"
 150 };
 151 static const struct_ioctlent ioctlent1[] = {
 152 # include "ioctlent1.h"
 153 };
 154 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 155 static const struct_printers printers0 = {
 156 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 157 };
 158 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 159 static const struct_printers printers1 = {
 160 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 161 };
 162 #endif
 163
 164 #if SUPPORTED_PERSONALITIES > 2
 165 static const char *const errnoent2[] = {
 166 # include "errnoent2.h"
 167 };
 168 static const char *const signalent2[] = {
 169 # include "signalent2.h"
 170 };
 171 static const struct_ioctlent ioctlent2[] = {
 172 # include "ioctlent2.h"
 173 };
 174 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 175 static const struct_printers printers2 = {
 176 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 177 };
 178 #endif
 179
 180 enum {
 181         nsyscalls0 = ARRAY_SIZE(sysent0)
 182 #if SUPPORTED_PERSONALITIES > 1
 183         , nsyscalls1 = ARRAY_SIZE(sysent1)
 184 # if SUPPORTED_PERSONALITIES > 2
 185         , nsyscalls2 = ARRAY_SIZE(sysent2)
 186 # endif
 187 #endif
 188 };
 189
 190 enum {
 191         nerrnos0 = ARRAY_SIZE(errnoent0)
 192 #if SUPPORTED_PERSONALITIES > 1
 193         , nerrnos1 = ARRAY_SIZE(errnoent1)
 194 # if SUPPORTED_PERSONALITIES > 2
 195         , nerrnos2 = ARRAY_SIZE(errnoent2)
 196 # endif
 197 #endif
 198 };
 199
 200 enum {
 201         nsignals0 = ARRAY_SIZE(signalent0)
 202 #if SUPPORTED_PERSONALITIES > 1
 203         , nsignals1 = ARRAY_SIZE(signalent1)
 204 # if SUPPORTED_PERSONALITIES > 2
 205         , nsignals2 = ARRAY_SIZE(signalent2)
 206 # endif
 207 #endif
 208 };
 209
 210 enum {
 211         nioctlents0 = ARRAY_SIZE(ioctlent0)
 212 #if SUPPORTED_PERSONALITIES > 1
 213         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 214 # if SUPPORTED_PERSONALITIES > 2
 215         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 216 # endif
 217 #endif
 218 };
 219
 220 #if SUPPORTED_PERSONALITIES > 1
 221 const struct_sysent *sysent = sysent0;
 222 const char *const *errnoent = errnoent0;
 223 const char *const *signalent = signalent0;
 224 const struct_ioctlent *ioctlent = ioctlent0;
 225 const struct_printers *printers = &printers0;
 226 #endif
 227
 228 unsigned nsyscalls = nsyscalls0;
 229 unsigned nerrnos = nerrnos0;
 230 unsigned nsignals = nsignals0;
 231 unsigned nioctlents = nioctlents0;
 232
 233 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 234         nsyscalls0,
 235 #if SUPPORTED_PERSONALITIES > 1
 236         nsyscalls1,
 237 #endif
 238 #if SUPPORTED_PERSONALITIES > 2
 239         nsyscalls2,
 240 #endif
 241 };
 242 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 243         sysent0,
 244 #if SUPPORTED_PERSONALITIES > 1
 245         sysent1,
 246 #endif
 247 #if SUPPORTED_PERSONALITIES > 2
 248         sysent2,
 249 #endif
 250 };
 251
 252 #if SUPPORTED_PERSONALITIES > 1
 253 unsigned current_personality;
 254
 255 # ifndef current_wordsize
 256 unsigned current_wordsize;
 257 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 258         PERSONALITY0_WORDSIZE,
 259         PERSONALITY1_WORDSIZE,
 260 # if SUPPORTED_PERSONALITIES > 2
 261         PERSONALITY2_WORDSIZE,
 262 # endif
 263 };
 264 # endif
 265
 266 # ifndef current_klongsize
 267 unsigned current_klongsize;
 268 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
 269         PERSONALITY0_KLONGSIZE,
 270         PERSONALITY1_KLONGSIZE,
 271 #  if SUPPORTED_PERSONALITIES > 2
 272         PERSONALITY2_KLONGSIZE,
 273 #  endif
 274 };
 275 # endif
 276
 277 void
 278 set_personality(int personality)
 279 {
 280         nsyscalls = nsyscall_vec[personality];
 281         sysent = sysent_vec[personality];
 282
 283         switch (personality) {
 284         case 0:
 285                 errnoent = errnoent0;
 286                 nerrnos = nerrnos0;
 287                 ioctlent = ioctlent0;
 288                 nioctlents = nioctlents0;
 289                 signalent = signalent0;
 290                 nsignals = nsignals0;
 291                 printers = &printers0;
 292                 break;
 293
 294         case 1:
 295                 errnoent = errnoent1;
 296                 nerrnos = nerrnos1;
 297                 ioctlent = ioctlent1;
 298                 nioctlents = nioctlents1;
 299                 signalent = signalent1;
 300                 nsignals = nsignals1;
 301                 printers = &printers1;
 302                 break;
 303
 304 # if SUPPORTED_PERSONALITIES > 2
 305         case 2:
 306                 errnoent = errnoent2;
 307                 nerrnos = nerrnos2;
 308                 ioctlent = ioctlent2;
 309                 nioctlents = nioctlents2;
 310                 signalent = signalent2;
 311                 nsignals = nsignals2;
 312                 printers = &printers2;
 313                 break;
 314 # endif
 315         }
 316
 317         current_personality = personality;
 318 # ifndef current_wordsize
 319         current_wordsize = personality_wordsize[personality];
 320 # endif
 321 # ifndef current_klongsize
 322         current_klongsize = personality_klongsize[personality];
 323 # endif
 324 }
 325
 326 static void
 327 update_personality(struct tcb *tcp, unsigned int personality)
 328 {
 329         if (personality == current_personality)
 330                 return;
 331         set_personality(personality);
 332
 333         if (personality == tcp->currpers)
 334                 return;
 335         tcp->currpers = personality;
 336
 337 # undef PERSONALITY_NAMES
 338 # if defined POWERPC64
 339 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 340 # elif defined X86_64
 341 #  define PERSONALITY_NAMES {"64 bit", "32 bit", "x32"}
 342 # elif defined X32
 343 #  define PERSONALITY_NAMES {"x32", "32 bit"}
 344 # elif defined AARCH64
 345 #  define PERSONALITY_NAMES {"64 bit", "32 bit"}
 346 # elif defined TILE
 347 #  define PERSONALITY_NAMES {"64-bit", "32-bit"}
 348 # endif
 349 # ifdef PERSONALITY_NAMES
 350         if (!qflag) {
 351                 static const char *const names[] = PERSONALITY_NAMES;
 352                 error_msg("[ Process PID=%d runs in %s mode. ]",
 353                           tcp->pid, names[personality]);
 354         }
 355 # endif
 356 }
 357 #endif
 358
 359 #ifdef SYS_socket_subcall
 360 static void
 361 decode_socket_subcall(struct tcb *tcp)
 362 {
 363         const int call = tcp->u_arg[0];
 364
 365         if (call < 1 || call >= SYS_socket_nsubcalls)
 366                 return;
 367
 368         const kernel_ulong_t scno = SYS_socket_subcall + call;
 369         const unsigned int nargs = sysent[scno].nargs;
 370         uint64_t buf[nargs];
 371
 372         if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
 373                 return;
 374
 375         tcp->scno = scno;
 376         tcp->qual_flg = qual_flags(scno);
 377         tcp->s_ent = &sysent[scno];
 378
 379         unsigned int i;
 380         for (i = 0; i < nargs; ++i)
 381                 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
 382                                 ? ((uint32_t *) (void *) buf)[i] : buf[i];
 383 }
 384 #endif
 385
 386 #ifdef SYS_ipc_subcall
 387 static void
 388 decode_ipc_subcall(struct tcb *tcp)
 389 {
 390         unsigned int call = tcp->u_arg[0];
 391         const unsigned int version = call >> 16;
 392
 393         if (version) {
 394 # if defined S390 || defined S390X
 395                 return;
 396 # else
 397 #  ifdef SPARC64
 398                 if (current_wordsize == 8)
 399                         return;
 400 #  endif
 401                 set_tcb_priv_ulong(tcp, version);
 402                 call &= 0xffff;
 403 # endif
 404         }
 405
 406         switch (call) {
 407                 case  1: case  2: case  3: case  4:
 408                 case 11: case 12: case 13: case 14:
 409                 case 21: case 22: case 23: case 24:
 410                         break;
 411                 default:
 412                         return;
 413         }
 414
 415         tcp->scno = SYS_ipc_subcall + call;
 416         tcp->qual_flg = qual_flags(tcp->scno);
 417         tcp->s_ent = &sysent[tcp->scno];
 418
 419         const unsigned int n = tcp->s_ent->nargs;
 420         unsigned int i;
 421         for (i = 0; i < n; i++)
 422                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 423 }
 424 #endif
 425
 426 #ifdef LINUX_MIPSO32
 427 static void
 428 decode_mips_subcall(struct tcb *tcp)
 429 {
 430         if (!scno_is_valid(tcp->u_arg[0]))
 431                 return;
 432         tcp->scno = tcp->u_arg[0];
 433         tcp->qual_flg = qual_flags(tcp->scno);
 434         tcp->s_ent = &sysent[tcp->scno];
 435         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 436                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 437         /*
 438          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 439          * and sync_file_range) requires additional code,
 440          * see linux/mips/get_syscall_args.c
 441          */
 442         if (tcp->s_ent->nargs == MAX_ARGS) {
 443                 if (umoven(tcp,
 444                            mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
 445                            sizeof(tcp->u_arg[0]),
 446                            &tcp->u_arg[MAX_ARGS - 1]) < 0)
 447                 tcp->u_arg[MAX_ARGS - 1] = 0;
 448         }
 449 }
 450 #endif /* LINUX_MIPSO32 */
 451
 452 static void
 453 dumpio(struct tcb *tcp)
 454 {
 455         if (syserror(tcp))
 456                 return;
 457
 458         int fd = tcp->u_arg[0];
 459         if (fd < 0)
 460                 return;
 461
 462         if (is_number_in_set(fd, &read_set)) {
 463                 switch (tcp->s_ent->sen) {
 464                 case SEN_read:
 465                 case SEN_pread:
 466                 case SEN_recv:
 467                 case SEN_recvfrom:
 468                 case SEN_mq_timedreceive:
 469                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 470                         return;
 471                 case SEN_readv:
 472                 case SEN_preadv:
 473                 case SEN_preadv2:
 474                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 475                                      tcp->u_rval);
 476                         return;
 477                 case SEN_recvmsg:
 478                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
 479                         return;
 480                 case SEN_recvmmsg:
 481                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 482                         return;
 483                 }
 484         }
 485         if (is_number_in_set(fd, &write_set)) {
 486                 switch (tcp->s_ent->sen) {
 487                 case SEN_write:
 488                 case SEN_pwrite:
 489                 case SEN_send:
 490                 case SEN_sendto:
 491                 case SEN_mq_timedsend:
 492                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 493                         break;
 494                 case SEN_writev:
 495                 case SEN_pwritev:
 496                 case SEN_pwritev2:
 497                 case SEN_vmsplice:
 498                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
 499                         break;
 500                 case SEN_sendmsg:
 501                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
 502                         break;
 503                 case SEN_sendmmsg:
 504                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 505                         break;
 506                 }
 507         }
 508 }
 509
 510 /*
 511  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 512  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 513  */
 514 static kernel_ulong_t
 515 shuffle_scno(kernel_ulong_t scno)
 516 {
 517 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 518         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 519                 return scno;
 520
 521         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 522         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 523                 return 0x000ffff0;
 524         if (scno == 0x000ffff0)
 525                 return ARM_FIRST_SHUFFLED_SYSCALL;
 526
 527 # define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 528         /*
 529          * Is it ARM specific syscall?
 530          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 531          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 532          */
 533         if (scno >= 0x000f0000 &&
 534             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 535                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 536         }
 537         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 538                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 539         }
 540 #endif /* ARM || AARCH64 */
 541
 542         return scno;
 543 }
 544
 545 const char *
 546 err_name(unsigned long err)
 547 {
 548         if ((err < nerrnos) && errnoent[err])
 549                 return errnoent[err];
 550
 551         return NULL;
 552 }
 553
 554 static long get_regs_error;
 555
 556 void
 557 clear_regs(void)
 558 {
 559         get_regs_error = -1;
 560 }
 561
 562 static void get_regs(pid_t pid);
 563 static int get_syscall_args(struct tcb *);
 564 static int get_syscall_result(struct tcb *);
 565 static int arch_get_scno(struct tcb *tcp);
 566 static int arch_set_scno(struct tcb *, kernel_ulong_t);
 567 static void get_error(struct tcb *, const bool);
 568 static int arch_set_error(struct tcb *);
 569 static int arch_set_success(struct tcb *);
 570
 571 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
 572
 573 static struct inject_opts *
 574 tcb_inject_opts(struct tcb *tcp)
 575 {
 576         return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
 577                ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
 578 }
 579
 580
 581 static long
 582 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
 583 {
 584         if (!tcp->inject_vec[current_personality]) {
 585                 tcp->inject_vec[current_personality] =
 586                         xcalloc(nsyscalls, sizeof(**inject_vec));
 587                 memcpy(tcp->inject_vec[current_personality],
 588                        inject_vec[current_personality],
 589                        nsyscalls * sizeof(**inject_vec));
 590         }
 591
 592         struct inject_opts *opts = tcb_inject_opts(tcp);
 593
 594         if (!opts || opts->first == 0)
 595                 return 0;
 596
 597         --opts->first;
 598
 599         if (opts->first != 0)
 600                 return 0;
 601
 602         opts->first = opts->step;
 603
 604         if (opts->signo > 0)
 605                 *signo = opts->signo;
 606         if (opts->rval != INJECT_OPTS_RVAL_DEFAULT && !arch_set_scno(tcp, -1))
 607                 tcp->flags |= TCB_TAMPERED;
 608
 609         return 0;
 610 }
 611
 612 static long
 613 tamper_with_syscall_exiting(struct tcb *tcp)
 614 {
 615         struct inject_opts *opts = tcb_inject_opts(tcp);
 616
 617         if (!opts)
 618                 return 0;
 619
 620         if (opts->rval >= 0) {
 621                 kernel_long_t u_rval = tcp->u_rval;
 622
 623                 tcp->u_rval = opts->rval;
 624                 if (arch_set_success(tcp)) {
 625                         tcp->u_rval = u_rval;
 626                 } else {
 627                         tcp->u_error = 0;
 628                 }
 629         } else {
 630                 unsigned long new_error = -opts->rval;
 631
 632                 if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
 633                         unsigned long u_error = tcp->u_error;
 634
 635                         tcp->u_error = new_error;
 636                         if (arch_set_error(tcp)) {
 637                                 tcp->u_error = u_error;
 638                         }
 639                 }
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int
 646 trace_syscall_entering(struct tcb *tcp, unsigned int *sig)
 647 {
 648         int res = get_scno(tcp);
 649         if (res == 0)
 650                 return res;
 651
 652         int scno_good = res;
 653         if (res == 1)
 654                 res = get_syscall_args(tcp);
 655
 656         if (res != 1) {
 657                 printleader(tcp);
 658                 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
 659                 /*
 660                  * " <unavailable>" will be added later by the code which
 661                  * detects ptrace errors.
 662                  */
 663                 goto ret;
 664         }
 665
 666 #ifdef LINUX_MIPSO32
 667         if (SEN_syscall == tcp->s_ent->sen)
 668                 decode_mips_subcall(tcp);
 669 #endif
 670
 671 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
 672         switch (tcp->s_ent->sen) {
 673 # ifdef SYS_socket_subcall
 674                 case SEN_socketcall:
 675                         decode_socket_subcall(tcp);
 676                         break;
 677 # endif
 678 # ifdef SYS_ipc_subcall
 679                 case SEN_ipc:
 680                         decode_ipc_subcall(tcp);
 681                         break;
 682 # endif
 683         }
 684 #endif
 685
 686         /* Restrain from fault injection while the trace executes strace code. */
 687         if (hide_log(tcp)) {
 688                 tcp->qual_flg &= ~QUAL_INJECT;
 689         }
 690
 691         switch (tcp->s_ent->sen) {
 692                 case SEN_execve:
 693                 case SEN_execveat:
 694 #if defined SPARC || defined SPARC64
 695                 case SEN_execv:
 696 #endif
 697                         tcp->flags &= ~TCB_HIDE_LOG;
 698                         break;
 699         }
 700
 701         if (!(tcp->qual_flg & QUAL_TRACE)
 702          || (tracing_paths && !pathtrace_match(tcp))
 703         ) {
 704                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
 705                 tcp->sys_func_rval = 0;
 706                 return 0;
 707         }
 708
 709         tcp->flags &= ~TCB_FILTERED;
 710
 711         if (hide_log(tcp)) {
 712                 res = 0;
 713                 goto ret;
 714         }
 715
 716         if (tcp->qual_flg & QUAL_INJECT)
 717                 tamper_with_syscall_entering(tcp, sig);
 718
 719         if (cflag == CFLAG_ONLY_STATS) {
 720                 res = 0;
 721                 goto ret;
 722         }
 723
 724 #ifdef USE_LIBUNWIND
 725         if (stack_trace_enabled) {
 726                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 727                         unwind_capture_stacktrace(tcp);
 728         }
 729 #endif
 730
 731         printleader(tcp);
 732         tprintf("%s(", tcp->s_ent->sys_name);
 733         if (tcp->qual_flg & QUAL_RAW)
 734                 res = printargs(tcp);
 735         else
 736                 res = tcp->s_ent->sys_func(tcp);
 737
 738         fflush(tcp->outf);
 739  ret:
 740         tcp->flags |= TCB_INSYSCALL;
 741         tcp->sys_func_rval = res;
 742         /* Measure the entrance time as late as possible to avoid errors. */
 743         if (Tflag || cflag)
 744                 gettimeofday(&tcp->etime, NULL);
 745         return res;
 746 }
 747
 748 static bool
 749 syscall_tampered(struct tcb *tcp)
 750 {
 751         return tcp->flags & TCB_TAMPERED;
 752 }
 753
 754 static int
 755 trace_syscall_exiting(struct tcb *tcp)
 756 {
 757         struct timeval tv;
 758
 759         /* Measure the exit time as early as possible to avoid errors. */
 760         if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
 761                 gettimeofday(&tv, NULL);
 762
 763 #ifdef USE_LIBUNWIND
 764         if (stack_trace_enabled) {
 765                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 766                         unwind_cache_invalidate(tcp);
 767         }
 768 #endif
 769
 770         if (filtered(tcp) || hide_log(tcp))
 771                 goto ret;
 772
 773         get_regs(tcp->pid);
 774 #if SUPPORTED_PERSONALITIES > 1
 775         update_personality(tcp, tcp->currpers);
 776 #endif
 777         int res = (get_regs_error ? -1 : get_syscall_result(tcp));
 778
 779         if (syserror(tcp) && syscall_tampered(tcp))
 780                 tamper_with_syscall_exiting(tcp);
 781
 782         if (cflag) {
 783                 count_syscall(tcp, &tv);
 784                 if (cflag == CFLAG_ONLY_STATS) {
 785                         goto ret;
 786                 }
 787         }
 788
 789         /* If not in -ff mode, and printing_tcp != tcp,
 790          * then the log currently does not end with output
 791          * of _our syscall entry_, but with something else.
 792          * We need to say which syscall's return is this.
 793          *
 794          * Forced reprinting via TCB_REPRINT is used only by
 795          * "strace -ff -oLOG test/threaded_execve" corner case.
 796          * It's the only case when -ff mode needs reprinting.
 797          */
 798         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 799                 tcp->flags &= ~TCB_REPRINT;
 800                 printleader(tcp);
 801                 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 802         }
 803         printing_tcp = tcp;
 804
 805         tcp->s_prev_ent = NULL;
 806         if (res != 1) {
 807                 /* There was error in one of prior ptrace ops */
 808                 tprints(") ");
 809                 tabto();
 810                 tprints("= ? <unavailable>\n");
 811                 line_ended();
 812                 tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
 813                 tcp->sys_func_rval = 0;
 814                 free_tcb_priv_data(tcp);
 815                 return res;
 816         }
 817         tcp->s_prev_ent = tcp->s_ent;
 818
 819         int sys_res = 0;
 820         if (tcp->qual_flg & QUAL_RAW) {
 821                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 822         } else {
 823         /* FIXME: not_failing_only (IOW, option -z) is broken:
 824          * failure of syscall is known only after syscall return.
 825          * Thus we end up with something like this on, say, ENOENT:
 826          *     open("doesnt_exist", O_RDONLY <unfinished ...>
 827          *     {next syscall decode}
 828          * whereas the intended result is that open(...) line
 829          * is not shown at all.
 830          */
 831                 if (not_failing_only && tcp->u_error)
 832                         goto ret;       /* ignore failed syscalls */
 833                 if (tcp->sys_func_rval & RVAL_DECODED)
 834                         sys_res = tcp->sys_func_rval;
 835                 else
 836                         sys_res = tcp->s_ent->sys_func(tcp);
 837         }
 838
 839         tprints(") ");
 840         tabto();
 841         unsigned long u_error = tcp->u_error;
 842
 843         if (tcp->qual_flg & QUAL_RAW) {
 844                 if (u_error) {
 845                         tprintf("= -1 (errno %lu)", u_error);
 846                 } else {
 847                         tprintf("= %#" PRI_klx, tcp->u_rval);
 848                 }
 849                 if (syscall_tampered(tcp))
 850                         tprints(" (INJECTED)");
 851         }
 852         else if (!(sys_res & RVAL_NONE) && u_error) {
 853                 const char *u_error_str;
 854
 855                 switch (u_error) {
 856                 /* Blocked signals do not interrupt any syscalls.
 857                  * In this case syscalls don't return ERESTARTfoo codes.
 858                  *
 859                  * Deadly signals set to SIG_DFL interrupt syscalls
 860                  * and kill the process regardless of which of the codes below
 861                  * is returned by the interrupted syscall.
 862                  * In some cases, kernel forces a kernel-generated deadly
 863                  * signal to be unblocked and set to SIG_DFL (and thus cause
 864                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 865                  * or SIGILL. (The alternative is to leave process spinning
 866                  * forever on the faulty instruction - not useful).
 867                  *
 868                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 869                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 870                  * but kernel will always restart them.
 871                  */
 872                 case ERESTARTSYS:
 873                         /* Most common type of signal-interrupted syscall exit code.
 874                          * The system call will be restarted with the same arguments
 875                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 876                          */
 877                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 878                         break;
 879                 case ERESTARTNOINTR:
 880                         /* Rare. For example, fork() returns this if interrupted.
 881                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 882                          */
 883                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 884                         break;
 885                 case ERESTARTNOHAND:
 886                         /* pause(), rt_sigsuspend() etc use this code.
 887                          * SA_RESTART is ignored (assumed not set):
 888                          * syscall won't restart (will return EINTR instead)
 889                          * even after signal with SA_RESTART set. However,
 890                          * after SIG_IGN or SIG_DFL signal it will restart
 891                          * (thus the name "restart only if has no handler").
 892                          */
 893                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 894                         break;
 895                 case ERESTART_RESTARTBLOCK:
 896                         /* Syscalls like nanosleep(), poll() which can't be
 897                          * restarted with their original arguments use this
 898                          * code. Kernel will execute restart_syscall() instead,
 899                          * which changes arguments before restarting syscall.
 900                          * SA_RESTART is ignored (assumed not set) similarly
 901                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 902                          * since restart data is saved in "restart block"
 903                          * in task struct, and if signal handler uses a syscall
 904                          * which in turn saves another such restart block,
 905                          * old data is lost and restart becomes impossible)
 906                          */
 907                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 908                         break;
 909                 default:
 910                         u_error_str = err_name(u_error);
 911                         if (u_error_str)
 912                                 tprintf("= -1 %s (%s)",
 913                                         u_error_str, strerror(u_error));
 914                         else
 915                                 tprintf("= -1 %lu (%s)",
 916                                         u_error, strerror(u_error));
 917                         break;
 918                 }
 919                 if (syscall_tampered(tcp))
 920                         tprints(" (INJECTED)");
 921                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 922                         tprintf(" (%s)", tcp->auxstr);
 923         }
 924         else {
 925                 if (sys_res & RVAL_NONE)
 926                         tprints("= ?");
 927                 else {
 928                         switch (sys_res & RVAL_MASK) {
 929                         case RVAL_HEX:
 930 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 931                                 if (current_wordsize < sizeof(tcp->u_rval)) {
 932                                         tprintf("= %#x",
 933                                                 (unsigned int) tcp->u_rval);
 934                                 } else
 935 #endif
 936                                 {
 937                                         tprintf("= %#" PRI_klx, tcp->u_rval);
 938                                 }
 939                                 break;
 940                         case RVAL_OCTAL:
 941                                 tprints("= ");
 942                                 print_numeric_long_umask(tcp->u_rval);
 943                                 break;
 944                         case RVAL_UDECIMAL:
 945 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 946                                 if (current_wordsize < sizeof(tcp->u_rval)) {
 947                                         tprintf("= %u",
 948                                                 (unsigned int) tcp->u_rval);
 949                                 } else
 950 #endif
 951                                 {
 952                                         tprintf("= %" PRI_klu, tcp->u_rval);
 953                                 }
 954                                 break;
 955                         case RVAL_DECIMAL:
 956                                 tprintf("= %" PRI_kld, tcp->u_rval);
 957                                 break;
 958                         case RVAL_FD:
 959                                 if (show_fd_path) {
 960                                         tprints("= ");
 961                                         printfd(tcp, tcp->u_rval);
 962                                 }
 963                                 else
 964                                         tprintf("= %" PRI_kld, tcp->u_rval);
 965                                 break;
 966                         default:
 967                                 error_msg("invalid rval format");
 968                                 break;
 969                         }
 970                 }
 971                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 972                         tprintf(" (%s)", tcp->auxstr);
 973                 if (syscall_tampered(tcp))
 974                         tprints(" (INJECTED)");
 975         }
 976         if (Tflag) {
 977                 tv_sub(&tv, &tv, &tcp->etime);
 978                 tprintf(" <%ld.%06ld>",
 979                         (long) tv.tv_sec, (long) tv.tv_usec);
 980         }
 981         tprints("\n");
 982         dumpio(tcp);
 983         line_ended();
 984
 985 #ifdef USE_LIBUNWIND
 986         if (stack_trace_enabled)
 987                 unwind_print_stacktrace(tcp);
 988 #endif
 989
 990  ret:
 991         tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
 992         tcp->sys_func_rval = 0;
 993         free_tcb_priv_data(tcp);
 994         return 0;
 995 }
 996
 997 int
 998 trace_syscall(struct tcb *tcp, unsigned int *signo)
 999 {
1000         return exiting(tcp) ?
1001                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp, signo);
1002 }
1003
1004 bool
1005 is_erestart(struct tcb *tcp)
1006 {
1007         switch (tcp->u_error) {
1008                 case ERESTARTSYS:
1009                 case ERESTARTNOINTR:
1010                 case ERESTARTNOHAND:
1011                 case ERESTART_RESTARTBLOCK:
1012                         return true;
1013                 default:
1014                         return false;
1015         }
1016 }
1017
1018 static unsigned long saved_u_error;
1019
1020 void
1021 temporarily_clear_syserror(struct tcb *tcp)
1022 {
1023         saved_u_error = tcp->u_error;
1024         tcp->u_error = 0;
1025 }
1026
1027 void
1028 restore_cleared_syserror(struct tcb *tcp)
1029 {
1030         tcp->u_error = saved_u_error;
1031 }
1032
1033 /*
1034  * Check the syscall return value register value for whether it is
1035  * a negated errno code indicating an error, or a success return value.
1036  */
1037 static inline bool
1038 is_negated_errno(kernel_ulong_t val)
1039 {
1040         /* Linux kernel defines MAX_ERRNO to 4095. */
1041         kernel_ulong_t max = -(kernel_long_t) 4095;
1042
1043 #ifndef current_klongsize
1044         if (current_klongsize < sizeof(val)) {
1045                 val = (uint32_t) val;
1046                 max = (uint32_t) max;
1047         }
1048 #endif /* !current_klongsize */
1049
1050         return val >= max;
1051 }
1052
1053 #include "arch_regs.c"
1054
1055 #ifdef HAVE_GETRVAL2
1056 # include "arch_getrval2.c"
1057 #endif
1058
1059 void
1060 print_pc(struct tcb *tcp)
1061 {
1062 #if defined ARCH_PC_REG
1063 # define ARCH_GET_PC 0
1064 #elif defined ARCH_PC_PEEK_ADDR
1065         kernel_ulong_t pc;
1066 # define ARCH_PC_REG pc
1067 # define ARCH_GET_PC upeek(tcp->pid, ARCH_PC_PEEK_ADDR, &pc)
1068 #else
1069 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1070 #endif
1071         get_regs(tcp->pid);
1072         if (get_regs_error || ARCH_GET_PC)
1073                 tprints(current_wordsize == 4 ? "[????????] "
1074                                               : "[????????????????] ");
1075         else
1076                 tprintf(current_wordsize == 4
1077                         ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1078                         (kernel_ulong_t) ARCH_PC_REG);
1079 }
1080
1081 #include "getregs_old.h"
1082
1083 #undef ptrace_getregset_or_getregs
1084 #undef ptrace_setregset_or_setregs
1085 #ifdef ARCH_REGS_FOR_GETREGSET
1086
1087 # define ptrace_getregset_or_getregs ptrace_getregset
1088 static long
1089 ptrace_getregset(pid_t pid)
1090 {
1091 # ifdef ARCH_IOVEC_FOR_GETREGSET
1092         /* variable iovec */
1093         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1094         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1095                       &ARCH_IOVEC_FOR_GETREGSET);
1096 # else
1097         /* constant iovec */
1098         static struct iovec io = {
1099                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1100                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1101         };
1102         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1103
1104 # endif
1105 }
1106
1107 # ifndef HAVE_GETREGS_OLD
1108 #  define ptrace_setregset_or_setregs ptrace_setregset
1109 static int
1110 ptrace_setregset(pid_t pid)
1111 {
1112 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1113         /* variable iovec */
1114         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1115                       &ARCH_IOVEC_FOR_GETREGSET);
1116 #  else
1117         /* constant iovec */
1118         static struct iovec io = {
1119                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1120                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1121         };
1122         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1123 #  endif
1124 }
1125 # endif /* !HAVE_GETREGS_OLD */
1126
1127 #elif defined ARCH_REGS_FOR_GETREGS
1128
1129 # define ptrace_getregset_or_getregs ptrace_getregs
1130 static long
1131 ptrace_getregs(pid_t pid)
1132 {
1133 # if defined SPARC || defined SPARC64
1134         /* SPARC systems have the meaning of data and addr reversed */
1135         return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1136 # else
1137         return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1138 # endif
1139 }
1140
1141 # ifndef HAVE_GETREGS_OLD
1142 #  define ptrace_setregset_or_setregs ptrace_setregs
1143 static int
1144 ptrace_setregs(pid_t pid)
1145 {
1146 #  if defined SPARC || defined SPARC64
1147         /* SPARC systems have the meaning of data and addr reversed */
1148         return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1149 #  else
1150         return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1151 #  endif
1152 }
1153 # endif /* !HAVE_GETREGS_OLD */
1154
1155 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1156
1157 static void
1158 get_regs(pid_t pid)
1159 {
1160 #undef USE_GET_SYSCALL_RESULT_REGS
1161 #ifdef ptrace_getregset_or_getregs
1162
1163         if (get_regs_error != -1)
1164                 return;
1165
1166 # ifdef HAVE_GETREGS_OLD
1167         /*
1168          * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1169          * fallback to getregs_old.
1170          */
1171         static int use_getregs_old;
1172         if (use_getregs_old < 0) {
1173                 get_regs_error = ptrace_getregset_or_getregs(pid);
1174                 return;
1175         } else if (use_getregs_old == 0) {
1176                 get_regs_error = ptrace_getregset_or_getregs(pid);
1177                 if (get_regs_error >= 0) {
1178                         use_getregs_old = -1;
1179                         return;
1180                 }
1181                 if (errno == EPERM || errno == ESRCH)
1182                         return;
1183                 use_getregs_old = 1;
1184         }
1185         get_regs_error = getregs_old(pid);
1186 # else /* !HAVE_GETREGS_OLD */
1187         /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1188         get_regs_error = ptrace_getregset_or_getregs(pid);
1189 # endif /* !HAVE_GETREGS_OLD */
1190
1191 #else /* !ptrace_getregset_or_getregs */
1192
1193 # define USE_GET_SYSCALL_RESULT_REGS 1
1194 # warning get_regs is not implemented for this architecture yet
1195         get_regs_error = 0;
1196
1197 #endif /* !ptrace_getregset_or_getregs */
1198 }
1199
1200 #ifdef ptrace_setregset_or_setregs
1201 static int
1202 set_regs(pid_t pid)
1203 {
1204         return ptrace_setregset_or_setregs(pid);
1205 }
1206 #endif /* ptrace_setregset_or_setregs */
1207
1208 struct sysent_buf {
1209         struct tcb *tcp;
1210         struct_sysent ent;
1211         char buf[sizeof("syscall_%lu") + sizeof(kernel_ulong_t) * 3];
1212 };
1213
1214 static void
1215 free_sysent_buf(void *ptr)
1216 {
1217         struct sysent_buf *s = ptr;
1218         s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1219         free(ptr);
1220 }
1221
1222 /*
1223  * Returns:
1224  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1225  * 1: ok, continue in trace_syscall_entering().
1226  * other: error, trace_syscall_entering() should print error indicator
1227  *    ("????" etc) and bail out.
1228  */
1229 int
1230 get_scno(struct tcb *tcp)
1231 {
1232         get_regs(tcp->pid);
1233
1234         if (get_regs_error)
1235                 return -1;
1236
1237         int rc = arch_get_scno(tcp);
1238         if (rc != 1)
1239                 return rc;
1240
1241         if (scno_is_valid(tcp->scno)) {
1242                 tcp->s_ent = &sysent[tcp->scno];
1243                 tcp->qual_flg = qual_flags(tcp->scno);
1244         } else {
1245                 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1246
1247                 s->tcp = tcp;
1248                 s->ent.nargs = MAX_ARGS;
1249                 s->ent.sen = SEN_printargs;
1250                 s->ent.sys_func = printargs;
1251                 s->ent.sys_name = s->buf;
1252                 sprintf(s->buf, "syscall_%" PRI_klu, shuffle_scno(tcp->scno));
1253
1254                 tcp->s_ent = &s->ent;
1255                 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1256
1257                 set_tcb_priv_data(tcp, s, free_sysent_buf);
1258
1259                 if (debug_flag)
1260                         error_msg("pid %d invalid syscall %" PRI_kld,
1261                                   tcp->pid, tcp->scno);
1262         }
1263         return 1;
1264 }
1265
1266 #ifdef USE_GET_SYSCALL_RESULT_REGS
1267 static int get_syscall_result_regs(struct tcb *);
1268 #endif
1269
1270 /* Returns:
1271  * 1: ok, continue in trace_syscall_exiting().
1272  * -1: error, trace_syscall_exiting() should print error indicator
1273  *    ("????" etc) and bail out.
1274  */
1275 static int
1276 get_syscall_result(struct tcb *tcp)
1277 {
1278 #ifdef USE_GET_SYSCALL_RESULT_REGS
1279         if (get_syscall_result_regs(tcp))
1280                 return -1;
1281 #endif
1282         tcp->u_error = 0;
1283         get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1284
1285         return 1;
1286 }
1287
1288 #include "get_scno.c"
1289 #include "set_scno.c"
1290 #include "get_syscall_args.c"
1291 #ifdef USE_GET_SYSCALL_RESULT_REGS
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
1300 const char *
1301 syscall_name(kernel_ulong_t scno)
1302 {
1303 #if defined X32_PERSONALITY_NUMBER && defined __X32_SYSCALL_BIT
1304         if (current_personality == X32_PERSONALITY_NUMBER)
1305                 scno &= ~__X32_SYSCALL_BIT;
1306 #endif
1307         return scno_is_valid(scno) ? sysent[scno].sys_name: NULL;
1308 }