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) 1999-2017 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 "native_defs.h"
  37 #include "nsig.h"
  38 #include "number_set.h"
  39 #include <sys/param.h>
  40
  41 /* for struct iovec */
  42 #include <sys/uio.h>
  43
  44 /* for __X32_SYSCALL_BIT */
  45 #include <asm/unistd.h>
  46
  47 #include "regs.h"
  48 #include "ptrace.h"
  49
  50 #if defined(SPARC64)
  51 # undef PTRACE_GETREGS
  52 # define PTRACE_GETREGS PTRACE_GETREGS64
  53 # undef PTRACE_SETREGS
  54 # define PTRACE_SETREGS PTRACE_SETREGS64
  55 #endif
  56
  57 #ifndef NT_PRSTATUS
  58 # define NT_PRSTATUS 1
  59 #endif
  60
  61 #include "syscall.h"
  62 #include "xstring.h"
  63
  64 /* Define these shorthand notations to simplify the syscallent files. */
  65 #include "sysent_shorthand_defs.h"
  66
  67 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  68
  69 const struct_sysent sysent0[] = {
  70 #include "syscallent.h"
  71 };
  72
  73 #if SUPPORTED_PERSONALITIES > 1
  74 # include PERSONALITY1_INCLUDE_FUNCS
  75 static const struct_sysent sysent1[] = {
  76 # include "syscallent1.h"
  77 };
  78 #endif
  79
  80 #if SUPPORTED_PERSONALITIES > 2
  81 # include PERSONALITY2_INCLUDE_FUNCS
  82 static const struct_sysent sysent2[] = {
  83 # include "syscallent2.h"
  84 };
  85 #endif
  86
  87 /* Now undef them since short defines cause wicked namespace pollution. */
  88 #include "sysent_shorthand_undefs.h"
  89
  90 /*
  91  * `ioctlent[012].h' files are automatically generated by the auxiliary
  92  * program `ioctlsort', such that the list is sorted by the `code' field.
  93  * This has the side-effect of resolving the _IO.. macros into
  94  * plain integers, eliminating the need to include here everything
  95  * in "/usr/include".
  96  */
  97
  98 const char *const errnoent0[] = {
  99 #include "errnoent.h"
 100 };
 101 const char *const signalent0[] = {
 102 #include "signalent.h"
 103 };
 104 const struct_ioctlent ioctlent0[] = {
 105 #include "ioctlent0.h"
 106 };
 107
 108 #if SUPPORTED_PERSONALITIES > 1
 109 static const char *const errnoent1[] = {
 110 # include "errnoent1.h"
 111 };
 112 static const char *const signalent1[] = {
 113 # include "signalent1.h"
 114 };
 115 static const struct_ioctlent ioctlent1[] = {
 116 # include "ioctlent1.h"
 117 };
 118 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 119 static const struct_printers printers0 = {
 120 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 121 };
 122 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 123 static const struct_printers printers1 = {
 124 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 125 };
 126 #endif
 127
 128 #if SUPPORTED_PERSONALITIES > 2
 129 static const char *const errnoent2[] = {
 130 # include "errnoent2.h"
 131 };
 132 static const char *const signalent2[] = {
 133 # include "signalent2.h"
 134 };
 135 static const struct_ioctlent ioctlent2[] = {
 136 # include "ioctlent2.h"
 137 };
 138 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 139 static const struct_printers printers2 = {
 140 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 141 };
 142 #endif
 143
 144 enum {
 145         nsyscalls0 = ARRAY_SIZE(sysent0)
 146 #if SUPPORTED_PERSONALITIES > 1
 147         , nsyscalls1 = ARRAY_SIZE(sysent1)
 148 # if SUPPORTED_PERSONALITIES > 2
 149         , nsyscalls2 = ARRAY_SIZE(sysent2)
 150 # endif
 151 #endif
 152 };
 153
 154 enum {
 155         nerrnos0 = ARRAY_SIZE(errnoent0)
 156 #if SUPPORTED_PERSONALITIES > 1
 157         , nerrnos1 = ARRAY_SIZE(errnoent1)
 158 # if SUPPORTED_PERSONALITIES > 2
 159         , nerrnos2 = ARRAY_SIZE(errnoent2)
 160 # endif
 161 #endif
 162 };
 163
 164 enum {
 165         nsignals0 = ARRAY_SIZE(signalent0)
 166 #if SUPPORTED_PERSONALITIES > 1
 167         , nsignals1 = ARRAY_SIZE(signalent1)
 168 # if SUPPORTED_PERSONALITIES > 2
 169         , nsignals2 = ARRAY_SIZE(signalent2)
 170 # endif
 171 #endif
 172 };
 173
 174 enum {
 175         nioctlents0 = ARRAY_SIZE(ioctlent0)
 176 #if SUPPORTED_PERSONALITIES > 1
 177         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 178 # if SUPPORTED_PERSONALITIES > 2
 179         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 180 # endif
 181 #endif
 182 };
 183
 184 #if SUPPORTED_PERSONALITIES > 1
 185 const struct_sysent *sysent = sysent0;
 186 const char *const *errnoent = errnoent0;
 187 const char *const *signalent = signalent0;
 188 const struct_ioctlent *ioctlent = ioctlent0;
 189 const struct_printers *printers = &printers0;
 190 #endif
 191
 192 unsigned nsyscalls = nsyscalls0;
 193 unsigned nerrnos = nerrnos0;
 194 unsigned nsignals = nsignals0;
 195 unsigned nioctlents = nioctlents0;
 196
 197 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 198         nsyscalls0,
 199 #if SUPPORTED_PERSONALITIES > 1
 200         nsyscalls1,
 201 #endif
 202 #if SUPPORTED_PERSONALITIES > 2
 203         nsyscalls2,
 204 #endif
 205 };
 206 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 207         sysent0,
 208 #if SUPPORTED_PERSONALITIES > 1
 209         sysent1,
 210 #endif
 211 #if SUPPORTED_PERSONALITIES > 2
 212         sysent2,
 213 #endif
 214 };
 215
 216 const char *const personality_names[] =
 217 # if defined X86_64
 218         {"64 bit", "32 bit", "x32"}
 219 # elif defined X32
 220         {"x32", "32 bit"}
 221 # elif SUPPORTED_PERSONALITIES == 2
 222         {"64 bit", "32 bit"}
 223 # else
 224         {STRINGIFY_VAL(__WORDSIZE) " bit"}
 225 # endif
 226         ;
 227
 228 #if SUPPORTED_PERSONALITIES > 1
 229
 230 unsigned current_personality;
 231
 232 # ifndef current_wordsize
 233 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
 234 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 235         PERSONALITY0_WORDSIZE,
 236         PERSONALITY1_WORDSIZE,
 237 # if SUPPORTED_PERSONALITIES > 2
 238         PERSONALITY2_WORDSIZE,
 239 # endif
 240 };
 241 # endif
 242
 243 # ifndef current_klongsize
 244 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
 245 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
 246         PERSONALITY0_KLONGSIZE,
 247         PERSONALITY1_KLONGSIZE,
 248 #  if SUPPORTED_PERSONALITIES > 2
 249         PERSONALITY2_KLONGSIZE,
 250 #  endif
 251 };
 252 # endif
 253
 254 void
 255 set_personality(unsigned int personality)
 256 {
 257         if (personality == current_personality)
 258                 return;
 259
 260         if (personality >= SUPPORTED_PERSONALITIES)
 261                 error_msg_and_die("Requested switch to unsupported personality "
 262                                   "%u", personality);
 263
 264         nsyscalls = nsyscall_vec[personality];
 265         sysent = sysent_vec[personality];
 266
 267         switch (personality) {
 268         case 0:
 269                 errnoent = errnoent0;
 270                 nerrnos = nerrnos0;
 271                 ioctlent = ioctlent0;
 272                 nioctlents = nioctlents0;
 273                 signalent = signalent0;
 274                 nsignals = nsignals0;
 275                 printers = &printers0;
 276                 break;
 277
 278         case 1:
 279                 errnoent = errnoent1;
 280                 nerrnos = nerrnos1;
 281                 ioctlent = ioctlent1;
 282                 nioctlents = nioctlents1;
 283                 signalent = signalent1;
 284                 nsignals = nsignals1;
 285                 printers = &printers1;
 286                 break;
 287
 288 # if SUPPORTED_PERSONALITIES > 2
 289         case 2:
 290                 errnoent = errnoent2;
 291                 nerrnos = nerrnos2;
 292                 ioctlent = ioctlent2;
 293                 nioctlents = nioctlents2;
 294                 signalent = signalent2;
 295                 nsignals = nsignals2;
 296                 printers = &printers2;
 297                 break;
 298 # endif
 299         }
 300
 301         current_personality = personality;
 302 # ifndef current_wordsize
 303         current_wordsize = personality_wordsize[personality];
 304 # endif
 305 # ifndef current_klongsize
 306         current_klongsize = personality_klongsize[personality];
 307 # endif
 308 }
 309
 310 static void
 311 update_personality(struct tcb *tcp, unsigned int personality)
 312 {
 313         static bool need_mpers_warning[] =
 314                 { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
 315
 316         set_personality(personality);
 317
 318         if (personality == tcp->currpers)
 319                 return;
 320         tcp->currpers = personality;
 321
 322         if (!qflag) {
 323                 error_msg("[ Process PID=%d runs in %s mode. ]",
 324                           tcp->pid, personality_names[personality]);
 325         }
 326
 327         if (need_mpers_warning[personality]) {
 328                 error_msg("WARNING: Proper structure decoding for this "
 329                           "personality is not supported, please consider "
 330                           "building strace with mpers support enabled.");
 331                 need_mpers_warning[personality] = false;
 332         }
 333 }
 334 #endif
 335
 336 #ifdef SYS_socket_subcall
 337 static void
 338 decode_socket_subcall(struct tcb *tcp)
 339 {
 340         const int call = tcp->u_arg[0];
 341
 342         if (call < 1 || call >= SYS_socket_nsubcalls)
 343                 return;
 344
 345         const kernel_ulong_t scno = SYS_socket_subcall + call;
 346         const unsigned int nargs = sysent[scno].nargs;
 347         uint64_t buf[nargs];
 348
 349         if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
 350                 return;
 351
 352         tcp->scno = scno;
 353         tcp->qual_flg = qual_flags(scno);
 354         tcp->s_ent = &sysent[scno];
 355
 356         unsigned int i;
 357         for (i = 0; i < nargs; ++i)
 358                 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
 359                                 ? ((uint32_t *) (void *) buf)[i] : buf[i];
 360 }
 361 #endif /* SYS_socket_subcall */
 362
 363 #ifdef SYS_ipc_subcall
 364 static void
 365 decode_ipc_subcall(struct tcb *tcp)
 366 {
 367         unsigned int call = tcp->u_arg[0];
 368         const unsigned int version = call >> 16;
 369
 370         if (version) {
 371 # if defined S390 || defined S390X
 372                 return;
 373 # else
 374 #  ifdef SPARC64
 375                 if (current_wordsize == 8)
 376                         return;
 377 #  endif
 378                 set_tcb_priv_ulong(tcp, version);
 379                 call &= 0xffff;
 380 # endif
 381         }
 382
 383         switch (call) {
 384                 case  1: case  2: case  3: case  4:
 385                 case 11: case 12: case 13: case 14:
 386                 case 21: case 22: case 23: case 24:
 387                         break;
 388                 default:
 389                         return;
 390         }
 391
 392         tcp->scno = SYS_ipc_subcall + call;
 393         tcp->qual_flg = qual_flags(tcp->scno);
 394         tcp->s_ent = &sysent[tcp->scno];
 395
 396         const unsigned int n = tcp->s_ent->nargs;
 397         unsigned int i;
 398         for (i = 0; i < n; i++)
 399                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 400 }
 401 #endif /* SYS_ipc_subcall */
 402
 403 #ifdef SYS_syscall_subcall
 404 static void
 405 decode_syscall_subcall(struct tcb *tcp)
 406 {
 407         if (!scno_is_valid(tcp->u_arg[0]))
 408                 return;
 409         tcp->scno = tcp->u_arg[0];
 410         tcp->qual_flg = qual_flags(tcp->scno);
 411         tcp->s_ent = &sysent[tcp->scno];
 412         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 413                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 414 # ifdef LINUX_MIPSO32
 415         /*
 416          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 417          * and sync_file_range) requires additional code,
 418          * see linux/mips/get_syscall_args.c
 419          */
 420         if (tcp->s_ent->nargs == MAX_ARGS) {
 421                 if (umoven(tcp,
 422                            mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
 423                            sizeof(tcp->u_arg[0]),
 424                            &tcp->u_arg[MAX_ARGS - 1]) < 0)
 425                 tcp->u_arg[MAX_ARGS - 1] = 0;
 426         }
 427 # endif /* LINUX_MIPSO32 */
 428 }
 429 #endif /* SYS_syscall_subcall */
 430
 431 static void
 432 dumpio(struct tcb *tcp)
 433 {
 434         if (syserror(tcp))
 435                 return;
 436
 437         int fd = tcp->u_arg[0];
 438         if (fd < 0)
 439                 return;
 440
 441         if (is_number_in_set(fd, read_set)) {
 442                 switch (tcp->s_ent->sen) {
 443                 case SEN_read:
 444                 case SEN_pread:
 445                 case SEN_recv:
 446                 case SEN_recvfrom:
 447                 case SEN_mq_timedreceive:
 448                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 449                         return;
 450                 case SEN_readv:
 451                 case SEN_preadv:
 452                 case SEN_preadv2:
 453                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 454                                      tcp->u_rval);
 455                         return;
 456                 case SEN_recvmsg:
 457                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
 458                         return;
 459                 case SEN_recvmmsg:
 460                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 461                         return;
 462                 }
 463         }
 464         if (is_number_in_set(fd, write_set)) {
 465                 switch (tcp->s_ent->sen) {
 466                 case SEN_write:
 467                 case SEN_pwrite:
 468                 case SEN_send:
 469                 case SEN_sendto:
 470                 case SEN_mq_timedsend:
 471                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 472                         break;
 473                 case SEN_writev:
 474                 case SEN_pwritev:
 475                 case SEN_pwritev2:
 476                 case SEN_vmsplice:
 477                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
 478                         break;
 479                 case SEN_sendmsg:
 480                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
 481                         break;
 482                 case SEN_sendmmsg:
 483                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 484                         break;
 485                 }
 486         }
 487 }
 488
 489 /*
 490  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 491  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 492  */
 493 static kernel_ulong_t
 494 shuffle_scno(kernel_ulong_t scno)
 495 {
 496 #ifdef ARM_FIRST_SHUFFLED_SYSCALL       /* So far only 32-bit ARM needs this */
 497         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 498                 return scno;
 499
 500         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 501         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 502                 return 0x000ffff0;
 503         if (scno == 0x000ffff0)
 504                 return ARM_FIRST_SHUFFLED_SYSCALL;
 505
 506 # define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 507         /*
 508          * Is it ARM specific syscall?
 509          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 510          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 511          */
 512         if (scno >= 0x000f0000 &&
 513             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 514                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 515         }
 516         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 517                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 518         }
 519 #endif /* ARM_FIRST_SHUFFLED_SYSCALL */
 520
 521         return scno;
 522 }
 523
 524 const char *
 525 err_name(unsigned long err)
 526 {
 527         if ((err < nerrnos) && errnoent[err])
 528                 return errnoent[err];
 529
 530         return NULL;
 531 }
 532
 533 static long get_regs(struct tcb *);
 534 static int get_syscall_args(struct tcb *);
 535 static int get_syscall_result(struct tcb *);
 536 static int arch_get_scno(struct tcb *tcp);
 537 static int arch_set_scno(struct tcb *, kernel_ulong_t);
 538 static void get_error(struct tcb *, const bool);
 539 static int arch_set_error(struct tcb *);
 540 static int arch_set_success(struct tcb *);
 541
 542 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
 543
 544 static struct inject_opts *
 545 tcb_inject_opts(struct tcb *tcp)
 546 {
 547         return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
 548                ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
 549 }
 550
 551
 552 static long
 553 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
 554 {
 555         if (!tcp->inject_vec[current_personality]) {
 556                 tcp->inject_vec[current_personality] =
 557                         xcalloc(nsyscalls, sizeof(**inject_vec));
 558                 memcpy(tcp->inject_vec[current_personality],
 559                        inject_vec[current_personality],
 560                        nsyscalls * sizeof(**inject_vec));
 561         }
 562
 563         struct inject_opts *opts = tcb_inject_opts(tcp);
 564
 565         if (!opts || opts->first == 0)
 566                 return 0;
 567
 568         --opts->first;
 569
 570         if (opts->first != 0)
 571                 return 0;
 572
 573         opts->first = opts->step;
 574
 575         if (opts->data.flags & INJECT_F_SIGNAL)
 576                 *signo = opts->data.signo;
 577         if (opts->data.flags & INJECT_F_RETVAL && !arch_set_scno(tcp, -1))
 578                 tcp->flags |= TCB_TAMPERED;
 579
 580         return 0;
 581 }
 582
 583 static long
 584 tamper_with_syscall_exiting(struct tcb *tcp)
 585 {
 586         struct inject_opts *opts = tcb_inject_opts(tcp);
 587
 588         if (!opts)
 589                 return 0;
 590
 591         if (opts->data.rval >= 0) {
 592                 kernel_long_t u_rval = tcp->u_rval;
 593
 594                 tcp->u_rval = opts->data.rval;
 595                 if (arch_set_success(tcp)) {
 596                         tcp->u_rval = u_rval;
 597                 } else {
 598                         tcp->u_error = 0;
 599                 }
 600         } else {
 601                 unsigned long new_error = -opts->data.rval;
 602
 603                 if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
 604                         unsigned long u_error = tcp->u_error;
 605
 606                         tcp->u_error = new_error;
 607                         if (arch_set_error(tcp)) {
 608                                 tcp->u_error = u_error;
 609                         }
 610                 }
 611         }
 612
 613         return 0;
 614 }
 615
 616 /*
 617  * Returns:
 618  * 0: "ignore this ptrace stop", bail out silently.
 619  * 1: ok, decoded; call
 620  *    syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
 621  * other: error; call syscall_entering_finish(tcp, res), where res is the value
 622  *    returned.
 623  */
 624 int
 625 syscall_entering_decode(struct tcb *tcp)
 626 {
 627         int res = get_scno(tcp);
 628         if (res == 0)
 629                 return res;
 630         int scno_good = res;
 631         if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
 632                 printleader(tcp);
 633                 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
 634                 /*
 635                  * " <unavailable>" will be added later by the code which
 636                  * detects ptrace errors.
 637                  */
 638                 return res;
 639         }
 640
 641 #if defined SYS_ipc_subcall     \
 642  || defined SYS_socket_subcall  \
 643  || defined SYS_syscall_subcall
 644         for (;;) {
 645                 switch (tcp->s_ent->sen) {
 646 # ifdef SYS_ipc_subcall
 647                 case SEN_ipc:
 648                         decode_ipc_subcall(tcp);
 649                         break;
 650 # endif
 651 # ifdef SYS_socket_subcall
 652                 case SEN_socketcall:
 653                         decode_socket_subcall(tcp);
 654                         break;
 655 # endif
 656 # ifdef SYS_syscall_subcall
 657                 case SEN_syscall:
 658                         decode_syscall_subcall(tcp);
 659                         if (tcp->s_ent->sen != SEN_syscall)
 660                                 continue;
 661                         break;
 662 # endif
 663                 }
 664                 break;
 665         }
 666 #endif
 667
 668         return 1;
 669 }
 670
 671 int
 672 syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
 673 {
 674         /* Restrain from fault injection while the trace executes strace code. */
 675         if (hide_log(tcp)) {
 676                 tcp->qual_flg &= ~QUAL_INJECT;
 677         }
 678
 679         switch (tcp->s_ent->sen) {
 680                 case SEN_execve:
 681                 case SEN_execveat:
 682 #if defined SPARC || defined SPARC64
 683                 case SEN_execv:
 684 #endif
 685                         tcp->flags &= ~TCB_HIDE_LOG;
 686                         break;
 687         }
 688
 689         if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
 690                 tcp->flags |= TCB_FILTERED;
 691                 return 0;
 692         }
 693
 694         tcp->flags &= ~TCB_FILTERED;
 695
 696         if (hide_log(tcp)) {
 697                 return 0;
 698         }
 699
 700         if (inject(tcp))
 701                 tamper_with_syscall_entering(tcp, sig);
 702
 703         if (cflag == CFLAG_ONLY_STATS) {
 704                 return 0;
 705         }
 706
 707 #ifdef USE_LIBUNWIND
 708         if (stack_trace_enabled) {
 709                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 710                         unwind_capture_stacktrace(tcp);
 711         }
 712 #endif
 713
 714         printleader(tcp);
 715         tprintf("%s(", tcp->s_ent->sys_name);
 716         int res = raw(tcp) ? printargs(tcp) : tcp->s_ent->sys_func(tcp);
 717         fflush(tcp->outf);
 718         return res;
 719 }
 720
 721 void
 722 syscall_entering_finish(struct tcb *tcp, int res)
 723 {
 724         tcp->flags |= TCB_INSYSCALL;
 725         tcp->sys_func_rval = res;
 726         /* Measure the entrance time as late as possible to avoid errors. */
 727         if ((Tflag || cflag) && !filtered(tcp))
 728                 gettimeofday(&tcp->etime, NULL);
 729 }
 730
 731 /* Returns:
 732  * 0: "bail out".
 733  * 1: ok.
 734  * -1: error in one of ptrace ops.
 735  *
 736  * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
 737  *    value. Anyway, call syscall_exiting_finish(tcp) then.
 738  */
 739 int
 740 syscall_exiting_decode(struct tcb *tcp, struct timeval *ptv)
 741 {
 742         /* Measure the exit time as early as possible to avoid errors. */
 743         if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
 744                 gettimeofday(ptv, NULL);
 745
 746 #ifdef USE_LIBUNWIND
 747         if (stack_trace_enabled) {
 748                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 749                         unwind_cache_invalidate(tcp);
 750         }
 751 #endif
 752
 753         if (filtered(tcp) || hide_log(tcp))
 754                 return 0;
 755
 756 #if SUPPORTED_PERSONALITIES > 1
 757         update_personality(tcp, tcp->currpers);
 758 #endif
 759
 760         return get_syscall_result(tcp);
 761 }
 762
 763 int
 764 syscall_exiting_trace(struct tcb *tcp, struct timeval tv, int res)
 765 {
 766         if (syserror(tcp) && syscall_tampered(tcp))
 767                 tamper_with_syscall_exiting(tcp);
 768
 769         if (cflag) {
 770                 count_syscall(tcp, &tv);
 771                 if (cflag == CFLAG_ONLY_STATS) {
 772                         return 0;
 773                 }
 774         }
 775
 776         /* If not in -ff mode, and printing_tcp != tcp,
 777          * then the log currently does not end with output
 778          * of _our syscall entry_, but with something else.
 779          * We need to say which syscall's return is this.
 780          *
 781          * Forced reprinting via TCB_REPRINT is used only by
 782          * "strace -ff -oLOG test/threaded_execve" corner case.
 783          * It's the only case when -ff mode needs reprinting.
 784          */
 785         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 786                 tcp->flags &= ~TCB_REPRINT;
 787                 printleader(tcp);
 788                 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 789         }
 790         printing_tcp = tcp;
 791
 792         tcp->s_prev_ent = NULL;
 793         if (res != 1) {
 794                 /* There was error in one of prior ptrace ops */
 795                 tprints(") ");
 796                 tabto();
 797                 tprints("= ? <unavailable>\n");
 798                 line_ended();
 799                 return res;
 800         }
 801         tcp->s_prev_ent = tcp->s_ent;
 802
 803         int sys_res = 0;
 804         if (raw(tcp)) {
 805                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 806         } else {
 807         /* FIXME: not_failing_only (IOW, option -z) is broken:
 808          * failure of syscall is known only after syscall return.
 809          * Thus we end up with something like this on, say, ENOENT:
 810          *     open("does_not_exist", O_RDONLY <unfinished ...>
 811          *     {next syscall decode}
 812          * whereas the intended result is that open(...) line
 813          * is not shown at all.
 814          */
 815                 if (not_failing_only && tcp->u_error)
 816                         return 0;       /* ignore failed syscalls */
 817                 if (tcp->sys_func_rval & RVAL_DECODED)
 818                         sys_res = tcp->sys_func_rval;
 819                 else
 820                         sys_res = tcp->s_ent->sys_func(tcp);
 821         }
 822
 823         tprints(") ");
 824         tabto();
 825         unsigned long u_error = tcp->u_error;
 826         kernel_long_t u_rval;
 827
 828         if (raw(tcp)) {
 829                 if (u_error) {
 830                         tprintf("= -1 (errno %lu)", u_error);
 831                 } else {
 832                         tprintf("= %#" PRI_klx, tcp->u_rval);
 833                 }
 834                 if (syscall_tampered(tcp))
 835                         tprints(" (INJECTED)");
 836         } else if (!(sys_res & RVAL_NONE) && u_error) {
 837                 const char *u_error_str;
 838
 839                 switch (u_error) {
 840                 /* Blocked signals do not interrupt any syscalls.
 841                  * In this case syscalls don't return ERESTARTfoo codes.
 842                  *
 843                  * Deadly signals set to SIG_DFL interrupt syscalls
 844                  * and kill the process regardless of which of the codes below
 845                  * is returned by the interrupted syscall.
 846                  * In some cases, kernel forces a kernel-generated deadly
 847                  * signal to be unblocked and set to SIG_DFL (and thus cause
 848                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 849                  * or SIGILL. (The alternative is to leave process spinning
 850                  * forever on the faulty instruction - not useful).
 851                  *
 852                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 853                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 854                  * but kernel will always restart them.
 855                  */
 856                 case ERESTARTSYS:
 857                         /* Most common type of signal-interrupted syscall exit code.
 858                          * The system call will be restarted with the same arguments
 859                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 860                          */
 861                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 862                         break;
 863                 case ERESTARTNOINTR:
 864                         /* Rare. For example, fork() returns this if interrupted.
 865                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 866                          */
 867                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 868                         break;
 869                 case ERESTARTNOHAND:
 870                         /* pause(), rt_sigsuspend() etc use this code.
 871                          * SA_RESTART is ignored (assumed not set):
 872                          * syscall won't restart (will return EINTR instead)
 873                          * even after signal with SA_RESTART set. However,
 874                          * after SIG_IGN or SIG_DFL signal it will restart
 875                          * (thus the name "restart only if has no handler").
 876                          */
 877                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 878                         break;
 879                 case ERESTART_RESTARTBLOCK:
 880                         /* Syscalls like nanosleep(), poll() which can't be
 881                          * restarted with their original arguments use this
 882                          * code. Kernel will execute restart_syscall() instead,
 883                          * which changes arguments before restarting syscall.
 884                          * SA_RESTART is ignored (assumed not set) similarly
 885                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 886                          * since restart data is saved in "restart block"
 887                          * in task struct, and if signal handler uses a syscall
 888                          * which in turn saves another such restart block,
 889                          * old data is lost and restart becomes impossible)
 890                          */
 891                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 892                         break;
 893                 default:
 894                         u_rval = sys_res & RVAL_PRINT_ERR_VAL ?
 895                                  tcp->u_rval : -1;
 896                         u_error_str = err_name(u_error);
 897                         if (u_error_str)
 898                                 tprintf("= %" PRI_kld " %s (%s)",
 899                                         u_rval, u_error_str, strerror(u_error));
 900                         else
 901                                 tprintf("= %" PRI_kld " %lu (%s)",
 902                                         u_rval, u_error, strerror(u_error));
 903                         break;
 904                 }
 905                 if (syscall_tampered(tcp))
 906                         tprints(" (INJECTED)");
 907                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 908                         tprintf(" (%s)", tcp->auxstr);
 909         } else {
 910                 if (sys_res & RVAL_NONE)
 911                         tprints("= ?");
 912                 else {
 913                         switch (sys_res & RVAL_MASK) {
 914                         case RVAL_HEX:
 915 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 916                                 if (current_wordsize < sizeof(tcp->u_rval)) {
 917                                         tprintf("= %#x",
 918                                                 (unsigned int) tcp->u_rval);
 919                                 } else
 920 #endif
 921                                 {
 922                                         tprintf("= %#" PRI_klx, tcp->u_rval);
 923                                 }
 924                                 break;
 925                         case RVAL_OCTAL:
 926                                 tprints("= ");
 927                                 print_numeric_long_umask(tcp->u_rval);
 928                                 break;
 929                         case RVAL_UDECIMAL:
 930 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 931                                 if (current_wordsize < sizeof(tcp->u_rval)) {
 932                                         tprintf("= %u",
 933                                                 (unsigned int) tcp->u_rval);
 934                                 } else
 935 #endif
 936                                 {
 937                                         tprintf("= %" PRI_klu, tcp->u_rval);
 938                                 }
 939                                 break;
 940                         case RVAL_DECIMAL:
 941                                 tprintf("= %" PRI_kld, tcp->u_rval);
 942                                 break;
 943                         case RVAL_FD:
 944                                 if (show_fd_path) {
 945                                         tprints("= ");
 946                                         printfd(tcp, tcp->u_rval);
 947                                 } else
 948                                         tprintf("= %" PRI_kld, tcp->u_rval);
 949                                 break;
 950                         default:
 951                                 error_msg("invalid rval format");
 952                                 break;
 953                         }
 954                 }
 955                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 956                         tprintf(" (%s)", tcp->auxstr);
 957                 if (syscall_tampered(tcp))
 958                         tprints(" (INJECTED)");
 959         }
 960         if (Tflag) {
 961                 tv_sub(&tv, &tv, &tcp->etime);
 962                 tprintf(" <%ld.%06ld>",
 963                         (long) tv.tv_sec, (long) tv.tv_usec);
 964         }
 965         tprints("\n");
 966         dumpio(tcp);
 967         line_ended();
 968
 969 #ifdef USE_LIBUNWIND
 970         if (stack_trace_enabled)
 971                 unwind_print_stacktrace(tcp);
 972 #endif
 973         return 0;
 974 }
 975
 976 void
 977 syscall_exiting_finish(struct tcb *tcp)
 978 {
 979         tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
 980         tcp->sys_func_rval = 0;
 981         free_tcb_priv_data(tcp);
 982 }
 983
 984 bool
 985 is_erestart(struct tcb *tcp)
 986 {
 987         switch (tcp->u_error) {
 988                 case ERESTARTSYS:
 989                 case ERESTARTNOINTR:
 990                 case ERESTARTNOHAND:
 991                 case ERESTART_RESTARTBLOCK:
 992                         return true;
 993                 default:
 994                         return false;
 995         }
 996 }
 997
 998 static unsigned long saved_u_error;
 999
1000 void
1001 temporarily_clear_syserror(struct tcb *tcp)
1002 {
1003         saved_u_error = tcp->u_error;
1004         tcp->u_error = 0;
1005 }
1006
1007 void
1008 restore_cleared_syserror(struct tcb *tcp)
1009 {
1010         tcp->u_error = saved_u_error;
1011 }
1012
1013 #include "arch_regs.c"
1014
1015 #ifdef HAVE_GETRVAL2
1016 # include "arch_getrval2.c"
1017 #endif
1018
1019 void
1020 print_pc(struct tcb *tcp)
1021 {
1022 #if defined ARCH_PC_REG
1023 # define ARCH_GET_PC 0
1024 #elif defined ARCH_PC_PEEK_ADDR
1025         kernel_ulong_t pc;
1026 # define ARCH_PC_REG pc
1027 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
1028 #else
1029 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1030 #endif
1031         if (get_regs(tcp) < 0 || ARCH_GET_PC)
1032                 tprints(current_wordsize == 4 ? "[????????] "
1033                                               : "[????????????????] ");
1034         else
1035                 tprintf(current_wordsize == 4
1036                         ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1037                         (kernel_ulong_t) ARCH_PC_REG);
1038 }
1039
1040 #include "getregs_old.h"
1041
1042 #undef ptrace_getregset_or_getregs
1043 #undef ptrace_setregset_or_setregs
1044 #ifdef ARCH_REGS_FOR_GETREGSET
1045
1046 # define ptrace_getregset_or_getregs ptrace_getregset
1047 static long
1048 ptrace_getregset(pid_t pid)
1049 {
1050 # ifdef ARCH_IOVEC_FOR_GETREGSET
1051         /* variable iovec */
1052         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1053         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1054                       &ARCH_IOVEC_FOR_GETREGSET);
1055 # else
1056         /* constant iovec */
1057         static struct iovec io = {
1058                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1059                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1060         };
1061         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1062
1063 # endif
1064 }
1065
1066 # ifndef HAVE_GETREGS_OLD
1067 #  define ptrace_setregset_or_setregs ptrace_setregset
1068 static int
1069 ptrace_setregset(pid_t pid)
1070 {
1071 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1072         /* variable iovec */
1073         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1074                       &ARCH_IOVEC_FOR_GETREGSET);
1075 #  else
1076         /* constant iovec */
1077         static struct iovec io = {
1078                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1079                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1080         };
1081         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1082 #  endif
1083 }
1084 # endif /* !HAVE_GETREGS_OLD */
1085
1086 #elif defined ARCH_REGS_FOR_GETREGS
1087
1088 # define ptrace_getregset_or_getregs ptrace_getregs
1089 static long
1090 ptrace_getregs(pid_t pid)
1091 {
1092 # if defined SPARC || defined SPARC64
1093         /* SPARC systems have the meaning of data and addr reversed */
1094         return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1095 # else
1096         return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1097 # endif
1098 }
1099
1100 # ifndef HAVE_GETREGS_OLD
1101 #  define ptrace_setregset_or_setregs ptrace_setregs
1102 static int
1103 ptrace_setregs(pid_t pid)
1104 {
1105 #  if defined SPARC || defined SPARC64
1106         /* SPARC systems have the meaning of data and addr reversed */
1107         return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1108 #  else
1109         return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1110 #  endif
1111 }
1112 # endif /* !HAVE_GETREGS_OLD */
1113
1114 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1115
1116 #ifdef ptrace_getregset_or_getregs
1117 static long get_regs_error;
1118 #endif
1119
1120 void
1121 clear_regs(struct tcb *tcp)
1122 {
1123 #ifdef ptrace_getregset_or_getregs
1124         get_regs_error = -1;
1125 #endif
1126 }
1127
1128 static long
1129 get_regs(struct tcb *const tcp)
1130 {
1131 #ifdef ptrace_getregset_or_getregs
1132
1133         if (get_regs_error != -1)
1134                 return get_regs_error;
1135
1136 # ifdef HAVE_GETREGS_OLD
1137         /*
1138          * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1139          * fallback to getregs_old.
1140          */
1141         static int use_getregs_old;
1142         if (use_getregs_old < 0) {
1143                 return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1144         } else if (use_getregs_old == 0) {
1145                 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1146                 if (get_regs_error >= 0) {
1147                         use_getregs_old = -1;
1148                         return get_regs_error;
1149                 }
1150                 if (errno == EPERM || errno == ESRCH)
1151                         return get_regs_error;
1152                 use_getregs_old = 1;
1153         }
1154         return get_regs_error = getregs_old(tcp);
1155 # else /* !HAVE_GETREGS_OLD */
1156         /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1157         get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1158
1159 #  if defined ARCH_PERSONALITY_0_IOV_SIZE
1160         if (get_regs_error)
1161                 return get_regs_error;
1162
1163         switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1164         case ARCH_PERSONALITY_0_IOV_SIZE:
1165                 update_personality(tcp, 0);
1166                 break;
1167         case ARCH_PERSONALITY_1_IOV_SIZE:
1168                 update_personality(tcp, 1);
1169                 break;
1170         default: {
1171                 static bool printed = false;
1172
1173                 if (!printed) {
1174                         error_msg("Unsupported regset size returned by "
1175                                   "PTRACE_GETREGSET: %zu",
1176                                   ARCH_IOVEC_FOR_GETREGSET.iov_len);
1177
1178                         printed = true;
1179                 }
1180
1181                 update_personality(tcp, 0);
1182         }
1183         }
1184 #  endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1185
1186         return get_regs_error;
1187
1188 # endif /* !HAVE_GETREGS_OLD */
1189
1190 #else /* !ptrace_getregset_or_getregs */
1191
1192 # warning get_regs is not implemented for this architecture yet
1193         return 0;
1194
1195 #endif /* !ptrace_getregset_or_getregs */
1196 }
1197
1198 #ifdef ptrace_setregset_or_setregs
1199 static int
1200 set_regs(pid_t pid)
1201 {
1202         return ptrace_setregset_or_setregs(pid);
1203 }
1204 #endif /* ptrace_setregset_or_setregs */
1205
1206 struct sysent_buf {
1207         struct tcb *tcp;
1208         struct_sysent ent;
1209         char buf[sizeof("syscall_%lu") + sizeof(kernel_ulong_t) * 3];
1210 };
1211
1212 static void
1213 free_sysent_buf(void *ptr)
1214 {
1215         struct sysent_buf *s = ptr;
1216         s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1217         free(ptr);
1218 }
1219
1220 /*
1221  * Returns:
1222  * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1223  *    out silently" code.
1224  * 1: ok, continue in syscall_entering_decode().
1225  * other: error, syscall_entering_decode() should print error indicator
1226  *    ("????" etc) and return an appropriate code.
1227  */
1228 int
1229 get_scno(struct tcb *tcp)
1230 {
1231         if (get_regs(tcp) < 0)
1232                 return -1;
1233
1234         int rc = arch_get_scno(tcp);
1235         if (rc != 1)
1236                 return rc;
1237
1238         if (scno_is_valid(tcp->scno)) {
1239                 tcp->s_ent = &sysent[tcp->scno];
1240                 tcp->qual_flg = qual_flags(tcp->scno);
1241         } else {
1242                 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1243
1244                 s->tcp = tcp;
1245                 s->ent.nargs = MAX_ARGS;
1246                 s->ent.sen = SEN_printargs;
1247                 s->ent.sys_func = printargs;
1248                 s->ent.sys_name = s->buf;
1249                 xsprintf(s->buf, "syscall_%" PRI_klu, shuffle_scno(tcp->scno));
1250
1251                 tcp->s_ent = &s->ent;
1252                 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1253
1254                 set_tcb_priv_data(tcp, s, free_sysent_buf);
1255
1256                 debug_msg("pid %d invalid syscall %" PRI_kld,
1257                           tcp->pid, tcp->scno);
1258         }
1259         return 1;
1260 }
1261
1262 #ifdef ptrace_getregset_or_getregs
1263 # define get_syscall_result_regs get_regs
1264 #else
1265 static int get_syscall_result_regs(struct tcb *);
1266 #endif
1267
1268 /* Returns:
1269  * 1: ok, continue in syscall_exiting_trace().
1270  * -1: error, syscall_exiting_trace() should print error indicator
1271  *    ("????" etc) and bail out.
1272  */
1273 static int
1274 get_syscall_result(struct tcb *tcp)
1275 {
1276         if (get_syscall_result_regs(tcp) < 0)
1277                 return -1;
1278         tcp->u_error = 0;
1279         get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
1280
1281         return 1;
1282 }
1283
1284 #include "get_scno.c"
1285 #include "set_scno.c"
1286 #include "get_syscall_args.c"
1287 #ifndef ptrace_getregset_or_getregs
1288 # include "get_syscall_result.c"
1289 #endif
1290 #include "get_error.c"
1291 #include "set_error.c"
1292 #ifdef HAVE_GETREGS_OLD
1293 # include "getregs_old.c"
1294 #endif
1295
1296 const char *
1297 syscall_name(kernel_ulong_t scno)
1298 {
1299 #if defined X32_PERSONALITY_NUMBER && defined __X32_SYSCALL_BIT
1300         if (current_personality == X32_PERSONALITY_NUMBER)
1301                 scno &= ~__X32_SYSCALL_BIT;
1302 #endif
1303         return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
1304 }