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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * Copyright (c) 1999-2018 The strace developers.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "defs.h"
  36 #include "mmap_notify.h"
  37 #include "native_defs.h"
  38 #include "ptrace.h"
  39 #include "nsig.h"
  40 #include "number_set.h"
  41 #include "delay.h"
  42 #include "retval.h"
  43 #include <limits.h>
  44
  45 /* for struct iovec */
  46 #include <sys/uio.h>
  47
  48 /* for __X32_SYSCALL_BIT */
  49 #include <asm/unistd.h>
  50
  51 #include "regs.h"
  52
  53 #if defined(SPARC64)
  54 # undef PTRACE_GETREGS
  55 # define PTRACE_GETREGS PTRACE_GETREGS64
  56 # undef PTRACE_SETREGS
  57 # define PTRACE_SETREGS PTRACE_SETREGS64
  58 #endif
  59
  60 #include "syscall.h"
  61 #include "xstring.h"
  62
  63 /* Define these shorthand notations to simplify the syscallent files. */
  64 #include "sysent_shorthand_defs.h"
  65
  66 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  67
  68 const struct_sysent sysent0[] = {
  69 #include "syscallent.h"
  70 };
  71
  72 #if SUPPORTED_PERSONALITIES > 1
  73 # include PERSONALITY1_INCLUDE_FUNCS
  74 static const struct_sysent sysent1[] = {
  75 # include "syscallent1.h"
  76 };
  77 #endif
  78
  79 #if SUPPORTED_PERSONALITIES > 2
  80 # include PERSONALITY2_INCLUDE_FUNCS
  81 static const struct_sysent sysent2[] = {
  82 # include "syscallent2.h"
  83 };
  84 #endif
  85
  86 /* Now undef them since short defines cause wicked namespace pollution. */
  87 #include "sysent_shorthand_undefs.h"
  88
  89 const char *const errnoent[] = {
  90 #include "errnoent.h"
  91 };
  92 const char *const signalent[] = {
  93 #include "signalent.h"
  94
  95 };
  96 /*
  97  * `ioctlent[012].h' files are automatically generated by the auxiliary
  98  * program `ioctlsort', such that the list is sorted by the `code' field.
  99  * This has the side-effect of resolving the _IO.. macros into
 100  * plain integers, eliminating the need to include here everything
 101  * in "/usr/include".
 102  */
 103
 104 const struct_ioctlent ioctlent0[] = {
 105 #include "ioctlent0.h"
 106 };
 107
 108 #if SUPPORTED_PERSONALITIES > 1
 109 static const struct_ioctlent ioctlent1[] = {
 110 # include "ioctlent1.h"
 111 };
 112 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 113 static const struct_printers printers0 = {
 114 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 115 };
 116 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 117 static const struct_printers printers1 = {
 118 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 119 };
 120 #endif
 121
 122 #if SUPPORTED_PERSONALITIES > 2
 123 static const struct_ioctlent ioctlent2[] = {
 124 # include "ioctlent2.h"
 125 };
 126 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 127 static const struct_printers printers2 = {
 128 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 129 };
 130 #endif
 131
 132 enum {
 133         nsyscalls0 = ARRAY_SIZE(sysent0)
 134 #if SUPPORTED_PERSONALITIES > 1
 135         , nsyscalls1 = ARRAY_SIZE(sysent1)
 136 # if SUPPORTED_PERSONALITIES > 2
 137         , nsyscalls2 = ARRAY_SIZE(sysent2)
 138 # endif
 139 #endif
 140 };
 141
 142 enum {
 143         nioctlents0 = ARRAY_SIZE(ioctlent0)
 144 #if SUPPORTED_PERSONALITIES > 1
 145         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 146 # if SUPPORTED_PERSONALITIES > 2
 147         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 148 # endif
 149 #endif
 150 };
 151
 152 #if SUPPORTED_PERSONALITIES > 1
 153 const struct_sysent *sysent = sysent0;
 154 const struct_ioctlent *ioctlent = ioctlent0;
 155 const struct_printers *printers = &printers0;
 156 #endif
 157
 158 const unsigned int nerrnos = ARRAY_SIZE(errnoent);
 159 const unsigned int nsignals = ARRAY_SIZE(signalent);
 160 unsigned nsyscalls = nsyscalls0;
 161 unsigned nioctlents = nioctlents0;
 162
 163 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 164         nsyscalls0,
 165 #if SUPPORTED_PERSONALITIES > 1
 166         nsyscalls1,
 167 #endif
 168 #if SUPPORTED_PERSONALITIES > 2
 169         nsyscalls2,
 170 #endif
 171 };
 172 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 173         sysent0,
 174 #if SUPPORTED_PERSONALITIES > 1
 175         sysent1,
 176 #endif
 177 #if SUPPORTED_PERSONALITIES > 2
 178         sysent2,
 179 #endif
 180 };
 181
 182 const char *const personality_names[] =
 183 # if defined X86_64
 184         {"64 bit", "32 bit", "x32"}
 185 # elif defined X32
 186         {"x32", "32 bit"}
 187 # elif SUPPORTED_PERSONALITIES == 2
 188         {"64 bit", "32 bit"}
 189 # else
 190         {STRINGIFY_VAL(__WORDSIZE) " bit"}
 191 # endif
 192         ;
 193
 194 const char *const personality_designators[] =
 195 # if defined X86_64
 196         { "64", "32", "x32" }
 197 # elif defined X32
 198         { "x32", "32" }
 199 # elif SUPPORTED_PERSONALITIES == 2
 200         { "64", "32" }
 201 # else
 202         { STRINGIFY_VAL(__WORDSIZE) }
 203 # endif
 204         ;
 205
 206 #if SUPPORTED_PERSONALITIES > 1
 207
 208 unsigned current_personality;
 209
 210 # ifndef current_wordsize
 211 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
 212 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 213         PERSONALITY0_WORDSIZE,
 214         PERSONALITY1_WORDSIZE,
 215 # if SUPPORTED_PERSONALITIES > 2
 216         PERSONALITY2_WORDSIZE,
 217 # endif
 218 };
 219 # endif
 220
 221 # ifndef current_klongsize
 222 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
 223 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
 224         PERSONALITY0_KLONGSIZE,
 225         PERSONALITY1_KLONGSIZE,
 226 #  if SUPPORTED_PERSONALITIES > 2
 227         PERSONALITY2_KLONGSIZE,
 228 #  endif
 229 };
 230 # endif
 231
 232 void
 233 set_personality(unsigned int personality)
 234 {
 235         if (personality == current_personality)
 236                 return;
 237
 238         if (personality >= SUPPORTED_PERSONALITIES)
 239                 error_msg_and_die("Requested switch to unsupported personality "
 240                                   "%u", personality);
 241
 242         nsyscalls = nsyscall_vec[personality];
 243         sysent = sysent_vec[personality];
 244
 245         switch (personality) {
 246         case 0:
 247                 ioctlent = ioctlent0;
 248                 nioctlents = nioctlents0;
 249                 printers = &printers0;
 250                 break;
 251
 252         case 1:
 253                 ioctlent = ioctlent1;
 254                 nioctlents = nioctlents1;
 255                 printers = &printers1;
 256                 break;
 257
 258 # if SUPPORTED_PERSONALITIES > 2
 259         case 2:
 260                 ioctlent = ioctlent2;
 261                 nioctlents = nioctlents2;
 262                 printers = &printers2;
 263                 break;
 264 # endif
 265         }
 266
 267         current_personality = personality;
 268 # ifndef current_wordsize
 269         current_wordsize = personality_wordsize[personality];
 270 # endif
 271 # ifndef current_klongsize
 272         current_klongsize = personality_klongsize[personality];
 273 # endif
 274 }
 275
 276 static void
 277 update_personality(struct tcb *tcp, unsigned int personality)
 278 {
 279         static bool need_mpers_warning[] =
 280                 { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
 281
 282         set_personality(personality);
 283
 284         if (personality == tcp->currpers)
 285                 return;
 286         tcp->currpers = personality;
 287
 288         if (!qflag) {
 289                 error_msg("[ Process PID=%d runs in %s mode. ]",
 290                           tcp->pid, personality_names[personality]);
 291         }
 292
 293         if (need_mpers_warning[personality]) {
 294                 error_msg("WARNING: Proper structure decoding for this "
 295                           "personality is not supported, please consider "
 296                           "building strace with mpers support enabled.");
 297                 need_mpers_warning[personality] = false;
 298         }
 299 }
 300 #endif
 301
 302 #ifdef SYS_socket_subcall
 303 static void
 304 decode_socket_subcall(struct tcb *tcp)
 305 {
 306         const int call = tcp->u_arg[0];
 307
 308         if (call < 1 || call >= SYS_socket_nsubcalls)
 309                 return;
 310
 311         const kernel_ulong_t scno = SYS_socket_subcall + call;
 312         const unsigned int nargs = sysent[scno].nargs;
 313         uint64_t buf[nargs];
 314
 315         if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
 316                 return;
 317
 318         tcp->scno = scno;
 319         tcp->qual_flg = qual_flags(scno);
 320         tcp->s_ent = &sysent[scno];
 321
 322         unsigned int i;
 323         for (i = 0; i < nargs; ++i)
 324                 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
 325                                 ? ((uint32_t *) (void *) buf)[i] : buf[i];
 326 }
 327 #endif /* SYS_socket_subcall */
 328
 329 #ifdef SYS_ipc_subcall
 330 static void
 331 decode_ipc_subcall(struct tcb *tcp)
 332 {
 333         unsigned int call = tcp->u_arg[0];
 334         const unsigned int version = call >> 16;
 335
 336         if (version) {
 337 # if defined S390 || defined S390X
 338                 return;
 339 # else
 340 #  ifdef SPARC64
 341                 if (current_wordsize == 8)
 342                         return;
 343 #  endif
 344                 set_tcb_priv_ulong(tcp, version);
 345                 call &= 0xffff;
 346 # endif
 347         }
 348
 349         switch (call) {
 350                 case  1: case  2: case  3: case  4:
 351                 case 11: case 12: case 13: case 14:
 352                 case 21: case 22: case 23: case 24:
 353                         break;
 354                 default:
 355                         return;
 356         }
 357
 358         tcp->scno = SYS_ipc_subcall + call;
 359         tcp->qual_flg = qual_flags(tcp->scno);
 360         tcp->s_ent = &sysent[tcp->scno];
 361
 362         const unsigned int n = tcp->s_ent->nargs;
 363         unsigned int i;
 364         for (i = 0; i < n; i++)
 365                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 366 }
 367 #endif /* SYS_ipc_subcall */
 368
 369 #ifdef SYS_syscall_subcall
 370 static void
 371 decode_syscall_subcall(struct tcb *tcp)
 372 {
 373         if (!scno_is_valid(tcp->u_arg[0]))
 374                 return;
 375         tcp->scno = tcp->u_arg[0];
 376         tcp->qual_flg = qual_flags(tcp->scno);
 377         tcp->s_ent = &sysent[tcp->scno];
 378         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 379                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 380 # ifdef LINUX_MIPSO32
 381         /*
 382          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 383          * and sync_file_range) requires additional code,
 384          * see linux/mips/get_syscall_args.c
 385          */
 386         if (tcp->s_ent->nargs == MAX_ARGS) {
 387                 if (umoven(tcp,
 388                            mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
 389                            sizeof(tcp->u_arg[0]),
 390                            &tcp->u_arg[MAX_ARGS - 1]) < 0)
 391                 tcp->u_arg[MAX_ARGS - 1] = 0;
 392         }
 393 # endif /* LINUX_MIPSO32 */
 394 }
 395 #endif /* SYS_syscall_subcall */
 396
 397 static void
 398 dumpio(struct tcb *tcp)
 399 {
 400         int fd = tcp->u_arg[0];
 401         if (fd < 0)
 402                 return;
 403
 404         if (is_number_in_set(fd, write_set)) {
 405                 switch (tcp->s_ent->sen) {
 406                 case SEN_write:
 407                 case SEN_pwrite:
 408                 case SEN_send:
 409                 case SEN_sendto:
 410                 case SEN_mq_timedsend:
 411                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 412                         break;
 413                 case SEN_writev:
 414                 case SEN_pwritev:
 415                 case SEN_pwritev2:
 416                 case SEN_vmsplice:
 417                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
 418                         break;
 419                 case SEN_sendmsg:
 420                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
 421                         break;
 422                 case SEN_sendmmsg:
 423                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 424                         break;
 425                 }
 426         }
 427
 428         if (syserror(tcp))
 429                 return;
 430
 431         if (is_number_in_set(fd, read_set)) {
 432                 switch (tcp->s_ent->sen) {
 433                 case SEN_read:
 434                 case SEN_pread:
 435                 case SEN_recv:
 436                 case SEN_recvfrom:
 437                 case SEN_mq_timedreceive:
 438                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 439                         return;
 440                 case SEN_readv:
 441                 case SEN_preadv:
 442                 case SEN_preadv2:
 443                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 444                                      tcp->u_rval);
 445                         return;
 446                 case SEN_recvmsg:
 447                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
 448                         return;
 449                 case SEN_recvmmsg:
 450                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 451                         return;
 452                 }
 453         }
 454 }
 455
 456 const char *
 457 err_name(unsigned long err)
 458 {
 459         if ((err < nerrnos) && errnoent[err])
 460                 return errnoent[err];
 461
 462         return NULL;
 463 }
 464
 465 static void
 466 print_err_ret(kernel_ulong_t ret, unsigned long u_error)
 467 {
 468         const char *u_error_str = err_name(u_error);
 469
 470         if (u_error_str)
 471                 tprintf("= %" PRI_kld " %s (%s)",
 472                         ret, u_error_str, strerror(u_error));
 473         else
 474                 tprintf("= %" PRI_kld " (errno %lu)", ret, u_error);
 475 }
 476
 477 static long get_regs(struct tcb *);
 478 static int get_syscall_args(struct tcb *);
 479 static int get_syscall_result(struct tcb *);
 480 static int arch_get_scno(struct tcb *tcp);
 481 static int arch_set_scno(struct tcb *, kernel_ulong_t);
 482 static void get_error(struct tcb *, const bool);
 483 static int arch_set_error(struct tcb *);
 484 static int arch_set_success(struct tcb *);
 485
 486 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
 487
 488 static struct inject_opts *
 489 tcb_inject_opts(struct tcb *tcp)
 490 {
 491         return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
 492                ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
 493 }
 494
 495
 496 static long
 497 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
 498 {
 499         if (!tcp->inject_vec[current_personality]) {
 500                 tcp->inject_vec[current_personality] =
 501                         xcalloc(nsyscalls, sizeof(**inject_vec));
 502                 memcpy(tcp->inject_vec[current_personality],
 503                        inject_vec[current_personality],
 504                        nsyscalls * sizeof(**inject_vec));
 505         }
 506
 507         struct inject_opts *opts = tcb_inject_opts(tcp);
 508
 509         if (!opts || opts->first == 0)
 510                 return 0;
 511
 512         --opts->first;
 513
 514         if (opts->first != 0)
 515                 return 0;
 516
 517         opts->first = opts->step;
 518
 519         if (!recovering(tcp)) {
 520                 if (opts->data.flags & INJECT_F_SIGNAL)
 521                         *signo = opts->data.signo;
 522                 if (opts->data.flags & (INJECT_F_ERROR | INJECT_F_RETVAL)) {
 523                         kernel_long_t scno =
 524                                 (opts->data.flags & INJECT_F_SYSCALL)
 525                                 ? (kernel_long_t) shuffle_scno(opts->data.scno)
 526                                 : -1;
 527
 528                         if (!arch_set_scno(tcp, scno)) {
 529                                 tcp->flags |= TCB_TAMPERED;
 530                                 if (scno != -1)
 531                                         tcp->flags |= TCB_TAMPERED_NO_FAIL;
 532                         }
 533                 }
 534                 if (opts->data.flags & INJECT_F_DELAY_ENTER)
 535                         delay_tcb(tcp, opts->data.delay_idx, true);
 536                 if (opts->data.flags & INJECT_F_DELAY_EXIT)
 537                         tcp->flags |= TCB_INJECT_DELAY_EXIT;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static long
 544 tamper_with_syscall_exiting(struct tcb *tcp)
 545 {
 546         struct inject_opts *opts = tcb_inject_opts(tcp);
 547         if (!opts)
 548                 return 0;
 549
 550         if (inject_delay_exit(tcp))
 551                 delay_tcb(tcp, opts->data.delay_idx, false);
 552
 553         if (!syscall_tampered(tcp))
 554                 return 0;
 555
 556         if (!syserror(tcp) ^ !!syscall_tampered_nofail(tcp)) {
 557                 error_msg("Failed to tamper with process %d: unexpectedly got"
 558                           " %serror (return value %#" PRI_klx ", error %lu)",
 559                           tcp->pid, syscall_tampered_nofail(tcp) ? "" : "no ",
 560                           tcp->u_rval, tcp->u_error);
 561
 562                 return 1;
 563         }
 564
 565         bool update_tcb = false;
 566
 567         if (opts->data.flags & INJECT_F_RETVAL) {
 568                 kernel_long_t inject_rval =
 569                         retval_get(opts->data.rval_idx);
 570                 kernel_long_t u_rval = tcp->u_rval;
 571
 572                 tcp->u_rval = inject_rval;
 573                 if (arch_set_success(tcp)) {
 574                         tcp->u_rval = u_rval;
 575                 } else {
 576                         update_tcb = true;
 577                         tcp->u_error = 0;
 578                 }
 579         } else {
 580                 unsigned long new_error = retval_get(opts->data.rval_idx);
 581
 582                 if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
 583                         unsigned long u_error = tcp->u_error;
 584
 585                         tcp->u_error = new_error;
 586                         if (arch_set_error(tcp)) {
 587                                 tcp->u_error = u_error;
 588                         } else {
 589                                 update_tcb = true;
 590                         }
 591                 }
 592         }
 593
 594         if (update_tcb) {
 595                 tcp->u_error = 0;
 596                 get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
 597         }
 598
 599         return 0;
 600 }
 601
 602 /*
 603  * Returns:
 604  * 0: "ignore this ptrace stop", bail out silently.
 605  * 1: ok, decoded; call
 606  *    syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
 607  * other: error; call syscall_entering_finish(tcp, res), where res is the value
 608  *    returned.
 609  */
 610 int
 611 syscall_entering_decode(struct tcb *tcp)
 612 {
 613         int res = get_scno(tcp);
 614         if (res == 0)
 615                 return res;
 616         int scno_good = res;
 617         if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
 618                 printleader(tcp);
 619                 tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
 620                 /*
 621                  * " <unavailable>" will be added later by the code which
 622                  * detects ptrace errors.
 623                  */
 624                 return res;
 625         }
 626
 627 #if defined SYS_ipc_subcall     \
 628  || defined SYS_socket_subcall  \
 629  || defined SYS_syscall_subcall
 630         for (;;) {
 631                 switch (tcp->s_ent->sen) {
 632 # ifdef SYS_ipc_subcall
 633                 case SEN_ipc:
 634                         decode_ipc_subcall(tcp);
 635                         break;
 636 # endif
 637 # ifdef SYS_socket_subcall
 638                 case SEN_socketcall:
 639                         decode_socket_subcall(tcp);
 640                         break;
 641 # endif
 642 # ifdef SYS_syscall_subcall
 643                 case SEN_syscall:
 644                         decode_syscall_subcall(tcp);
 645                         if (tcp->s_ent->sen != SEN_syscall)
 646                                 continue;
 647                         break;
 648 # endif
 649                 }
 650                 break;
 651         }
 652 #endif
 653
 654         return 1;
 655 }
 656
 657 int
 658 syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
 659 {
 660         /* Restrain from fault injection while the trace executes strace code. */
 661         if (hide_log(tcp)) {
 662                 tcp->qual_flg &= ~QUAL_INJECT;
 663         }
 664
 665         switch (tcp->s_ent->sen) {
 666                 case SEN_execve:
 667                 case SEN_execveat:
 668 #if defined SPARC || defined SPARC64
 669                 case SEN_execv:
 670 #endif
 671                         tcp->flags &= ~TCB_HIDE_LOG;
 672                         break;
 673         }
 674
 675         if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
 676                 tcp->flags |= TCB_FILTERED;
 677                 return 0;
 678         }
 679
 680         tcp->flags &= ~TCB_FILTERED;
 681
 682         if (hide_log(tcp)) {
 683                 return 0;
 684         }
 685
 686         if (inject(tcp))
 687                 tamper_with_syscall_entering(tcp, sig);
 688
 689         if (cflag == CFLAG_ONLY_STATS) {
 690                 return 0;
 691         }
 692
 693 #ifdef ENABLE_STACKTRACE
 694         if (stack_trace_enabled) {
 695                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 696                         unwind_tcb_capture(tcp);
 697         }
 698 #endif
 699
 700         printleader(tcp);
 701         tprintf("%s(", tcp->s_ent->sys_name);
 702         int res = raw(tcp) ? printargs(tcp) : tcp->s_ent->sys_func(tcp);
 703         fflush(tcp->outf);
 704         return res;
 705 }
 706
 707 void
 708 syscall_entering_finish(struct tcb *tcp, int res)
 709 {
 710         tcp->flags |= TCB_INSYSCALL;
 711         tcp->sys_func_rval = res;
 712         /* Measure the entrance time as late as possible to avoid errors. */
 713         if ((Tflag || cflag) && !filtered(tcp))
 714                 clock_gettime(CLOCK_MONOTONIC, &tcp->etime);
 715 }
 716
 717 /* Returns:
 718  * 0: "bail out".
 719  * 1: ok.
 720  * -1: error in one of ptrace ops.
 721  *
 722  * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
 723  *    value. Anyway, call syscall_exiting_finish(tcp) then.
 724  */
 725 int
 726 syscall_exiting_decode(struct tcb *tcp, struct timespec *pts)
 727 {
 728         /* Measure the exit time as early as possible to avoid errors. */
 729         if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
 730                 clock_gettime(CLOCK_MONOTONIC, pts);
 731
 732         if (tcp->s_ent->sys_flags & MEMORY_MAPPING_CHANGE)
 733                 mmap_notify_report(tcp);
 734
 735         if (filtered(tcp) || hide_log(tcp))
 736                 return 0;
 737
 738 #if SUPPORTED_PERSONALITIES > 1
 739         update_personality(tcp, tcp->currpers);
 740 #endif
 741
 742         return get_syscall_result(tcp);
 743 }
 744
 745 int
 746 syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res)
 747 {
 748         if (syscall_tampered(tcp) || inject_delay_exit(tcp))
 749                 tamper_with_syscall_exiting(tcp);
 750
 751         if (cflag) {
 752                 count_syscall(tcp, ts);
 753                 if (cflag == CFLAG_ONLY_STATS) {
 754                         return 0;
 755                 }
 756         }
 757
 758         /* If not in -ff mode, and printing_tcp != tcp,
 759          * then the log currently does not end with output
 760          * of _our syscall entry_, but with something else.
 761          * We need to say which syscall's return is this.
 762          *
 763          * Forced reprinting via TCB_REPRINT is used only by
 764          * "strace -ff -oLOG test/threaded_execve" corner case.
 765          * It's the only case when -ff mode needs reprinting.
 766          */
 767         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 768                 tcp->flags &= ~TCB_REPRINT;
 769                 printleader(tcp);
 770                 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 771         }
 772         printing_tcp = tcp;
 773
 774         tcp->s_prev_ent = NULL;
 775         if (res != 1) {
 776                 /* There was error in one of prior ptrace ops */
 777                 tprints(") ");
 778                 tabto();
 779                 tprints("= ? <unavailable>\n");
 780                 line_ended();
 781                 return res;
 782         }
 783         tcp->s_prev_ent = tcp->s_ent;
 784
 785         int sys_res = 0;
 786         if (raw(tcp)) {
 787                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 788         } else {
 789         /* FIXME: not_failing_only (IOW, option -z) is broken:
 790          * failure of syscall is known only after syscall return.
 791          * Thus we end up with something like this on, say, ENOENT:
 792          *     open("does_not_exist", O_RDONLY <unfinished ...>
 793          *     {next syscall decode}
 794          * whereas the intended result is that open(...) line
 795          * is not shown at all.
 796          */
 797                 if (not_failing_only && tcp->u_error)
 798                         return 0;       /* ignore failed syscalls */
 799                 if (tcp->sys_func_rval & RVAL_DECODED)
 800                         sys_res = tcp->sys_func_rval;
 801                 else
 802                         sys_res = tcp->s_ent->sys_func(tcp);
 803         }
 804
 805         tprints(") ");
 806         tabto();
 807
 808         if (raw(tcp)) {
 809                 if (tcp->u_error)
 810                         print_err_ret(tcp->u_rval, tcp->u_error);
 811                 else
 812                         tprintf("= %#" PRI_klx, tcp->u_rval);
 813
 814                 if (syscall_tampered(tcp))
 815                         tprints(" (INJECTED)");
 816         } else if (!(sys_res & RVAL_NONE) && tcp->u_error) {
 817                 switch (tcp->u_error) {
 818                 /* Blocked signals do not interrupt any syscalls.
 819                  * In this case syscalls don't return ERESTARTfoo codes.
 820                  *
 821                  * Deadly signals set to SIG_DFL interrupt syscalls
 822                  * and kill the process regardless of which of the codes below
 823                  * is returned by the interrupted syscall.
 824                  * In some cases, kernel forces a kernel-generated deadly
 825                  * signal to be unblocked and set to SIG_DFL (and thus cause
 826                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 827                  * or SIGILL. (The alternative is to leave process spinning
 828                  * forever on the faulty instruction - not useful).
 829                  *
 830                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 831                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 832                  * but kernel will always restart them.
 833                  */
 834                 case ERESTARTSYS:
 835                         /* Most common type of signal-interrupted syscall exit code.
 836                          * The system call will be restarted with the same arguments
 837                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 838                          */
 839                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 840                         break;
 841                 case ERESTARTNOINTR:
 842                         /* Rare. For example, fork() returns this if interrupted.
 843                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 844                          */
 845                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 846                         break;
 847                 case ERESTARTNOHAND:
 848                         /* pause(), rt_sigsuspend() etc use this code.
 849                          * SA_RESTART is ignored (assumed not set):
 850                          * syscall won't restart (will return EINTR instead)
 851                          * even after signal with SA_RESTART set. However,
 852                          * after SIG_IGN or SIG_DFL signal it will restart
 853                          * (thus the name "restart only if has no handler").
 854                          */
 855                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 856                         break;
 857                 case ERESTART_RESTARTBLOCK:
 858                         /* Syscalls like nanosleep(), poll() which can't be
 859                          * restarted with their original arguments use this
 860                          * code. Kernel will execute restart_syscall() instead,
 861                          * which changes arguments before restarting syscall.
 862                          * SA_RESTART is ignored (assumed not set) similarly
 863                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 864                          * since restart data is saved in "restart block"
 865                          * in task struct, and if signal handler uses a syscall
 866                          * which in turn saves another such restart block,
 867                          * old data is lost and restart becomes impossible)
 868                          */
 869                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 870                         break;
 871                 default:
 872                         print_err_ret(tcp->u_rval, tcp->u_error);
 873                         break;
 874                 }
 875                 if (syscall_tampered(tcp))
 876                         tprints(" (INJECTED)");
 877                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 878                         tprintf(" (%s)", tcp->auxstr);
 879         } else {
 880                 if (sys_res & RVAL_NONE)
 881                         tprints("= ?");
 882                 else {
 883                         switch (sys_res & RVAL_MASK) {
 884                         case RVAL_HEX:
 885 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 886                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 887                                         tprintf("= %#x",
 888                                                 (unsigned int) tcp->u_rval);
 889                                 } else
 890 #endif
 891                                 {
 892                                         tprintf("= %#" PRI_klx, tcp->u_rval);
 893                                 }
 894                                 break;
 895                         case RVAL_OCTAL:
 896                                 tprints("= ");
 897                                 print_numeric_long_umask(tcp->u_rval);
 898                                 break;
 899                         case RVAL_UDECIMAL:
 900 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 901                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 902                                         tprintf("= %u",
 903                                                 (unsigned int) tcp->u_rval);
 904                                 } else
 905 #endif
 906                                 {
 907                                         tprintf("= %" PRI_klu, tcp->u_rval);
 908                                 }
 909                                 break;
 910                         case RVAL_FD:
 911                                 if (show_fd_path) {
 912                                         tprints("= ");
 913                                         printfd(tcp, tcp->u_rval);
 914                                 } else
 915                                         tprintf("= %" PRI_kld, tcp->u_rval);
 916                                 break;
 917                         default:
 918                                 error_msg("invalid rval format");
 919                                 break;
 920                         }
 921                 }
 922                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 923                         tprintf(" (%s)", tcp->auxstr);
 924                 if (syscall_tampered(tcp))
 925                         tprints(" (INJECTED)");
 926         }
 927         if (Tflag) {
 928                 ts_sub(ts, ts, &tcp->etime);
 929                 tprintf(" <%ld.%06ld>",
 930                         (long) ts->tv_sec, (long) ts->tv_nsec / 1000);
 931         }
 932         tprints("\n");
 933         dumpio(tcp);
 934         line_ended();
 935
 936 #ifdef ENABLE_STACKTRACE
 937         if (stack_trace_enabled)
 938                 unwind_tcb_print(tcp);
 939 #endif
 940         return 0;
 941 }
 942
 943 void
 944 syscall_exiting_finish(struct tcb *tcp)
 945 {
 946         tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED | TCB_INJECT_DELAY_EXIT);
 947         tcp->sys_func_rval = 0;
 948         free_tcb_priv_data(tcp);
 949 }
 950
 951 bool
 952 is_erestart(struct tcb *tcp)
 953 {
 954         switch (tcp->u_error) {
 955                 case ERESTARTSYS:
 956                 case ERESTARTNOINTR:
 957                 case ERESTARTNOHAND:
 958                 case ERESTART_RESTARTBLOCK:
 959                         return true;
 960                 default:
 961                         return false;
 962         }
 963 }
 964
 965 static unsigned long saved_u_error;
 966
 967 void
 968 temporarily_clear_syserror(struct tcb *tcp)
 969 {
 970         saved_u_error = tcp->u_error;
 971         tcp->u_error = 0;
 972 }
 973
 974 void
 975 restore_cleared_syserror(struct tcb *tcp)
 976 {
 977         tcp->u_error = saved_u_error;
 978 }
 979
 980 #define XLAT_MACROS_ONLY
 981 # include "xlat/nt_descriptor_types.h"
 982 #undef XLAT_MACROS_ONLY
 983
 984 #include "arch_regs.c"
 985
 986 #if HAVE_ARCH_GETRVAL2
 987 # include "arch_getrval2.c"
 988 #endif
 989
 990 void
 991 print_pc(struct tcb *tcp)
 992 {
 993 #if defined ARCH_PC_REG
 994 # define ARCH_GET_PC 0
 995 #elif defined ARCH_PC_PEEK_ADDR
 996         kernel_ulong_t pc;
 997 # define ARCH_PC_REG pc
 998 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
 999 #else
1000 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1001 #endif
1002         if (get_regs(tcp) < 0 || ARCH_GET_PC)
1003                 tprints(current_wordsize == 4 ? "[????????] "
1004                                               : "[????????????????] ");
1005         else
1006                 tprintf(current_wordsize == 4
1007                         ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1008                         (kernel_ulong_t) ARCH_PC_REG);
1009 }
1010
1011 #include "getregs_old.h"
1012
1013 #undef ptrace_getregset_or_getregs
1014 #undef ptrace_setregset_or_setregs
1015 #ifdef ARCH_REGS_FOR_GETREGSET
1016
1017 # define ptrace_getregset_or_getregs ptrace_getregset
1018 static long
1019 ptrace_getregset(pid_t pid)
1020 {
1021 # ifdef ARCH_IOVEC_FOR_GETREGSET
1022         /* variable iovec */
1023         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1024         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1025                       &ARCH_IOVEC_FOR_GETREGSET);
1026 # else
1027         /* constant iovec */
1028         static struct iovec io = {
1029                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1030                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1031         };
1032         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1033
1034 # endif
1035 }
1036
1037 # ifndef HAVE_GETREGS_OLD
1038 #  define ptrace_setregset_or_setregs ptrace_setregset
1039 static int
1040 ptrace_setregset(pid_t pid)
1041 {
1042 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1043         /* variable iovec */
1044         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1045                       &ARCH_IOVEC_FOR_GETREGSET);
1046 #  else
1047         /* constant iovec */
1048         static struct iovec io = {
1049                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1050                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1051         };
1052         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1053 #  endif
1054 }
1055 # endif /* !HAVE_GETREGS_OLD */
1056
1057 #elif defined ARCH_REGS_FOR_GETREGS
1058
1059 # define ptrace_getregset_or_getregs ptrace_getregs
1060 static long
1061 ptrace_getregs(pid_t pid)
1062 {
1063 # if defined SPARC || defined SPARC64
1064         /* SPARC systems have the meaning of data and addr reversed */
1065         return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1066 # else
1067         return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1068 # endif
1069 }
1070
1071 # ifndef HAVE_GETREGS_OLD
1072 #  define ptrace_setregset_or_setregs ptrace_setregs
1073 static int
1074 ptrace_setregs(pid_t pid)
1075 {
1076 #  if defined SPARC || defined SPARC64
1077         /* SPARC systems have the meaning of data and addr reversed */
1078         return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1079 #  else
1080         return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1081 #  endif
1082 }
1083 # endif /* !HAVE_GETREGS_OLD */
1084
1085 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1086
1087 #ifdef ptrace_getregset_or_getregs
1088 static long get_regs_error;
1089 #endif
1090
1091 void
1092 clear_regs(struct tcb *tcp)
1093 {
1094 #ifdef ptrace_getregset_or_getregs
1095         get_regs_error = -1;
1096 #endif
1097 }
1098
1099 static long
1100 get_regs(struct tcb *const tcp)
1101 {
1102 #ifdef ptrace_getregset_or_getregs
1103
1104         if (get_regs_error != -1)
1105                 return get_regs_error;
1106
1107 # ifdef HAVE_GETREGS_OLD
1108         /*
1109          * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1110          * fallback to getregs_old.
1111          */
1112         static int use_getregs_old;
1113         if (use_getregs_old < 0) {
1114                 return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1115         } else if (use_getregs_old == 0) {
1116                 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1117                 if (get_regs_error >= 0) {
1118                         use_getregs_old = -1;
1119                         return get_regs_error;
1120                 }
1121                 if (errno == EPERM || errno == ESRCH)
1122                         return get_regs_error;
1123                 use_getregs_old = 1;
1124         }
1125         return get_regs_error = getregs_old(tcp);
1126 # else /* !HAVE_GETREGS_OLD */
1127         /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1128         get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1129
1130 #  if defined ARCH_PERSONALITY_0_IOV_SIZE
1131         if (get_regs_error)
1132                 return get_regs_error;
1133
1134         switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1135         case ARCH_PERSONALITY_0_IOV_SIZE:
1136                 update_personality(tcp, 0);
1137                 break;
1138         case ARCH_PERSONALITY_1_IOV_SIZE:
1139                 update_personality(tcp, 1);
1140                 break;
1141         default: {
1142                 static bool printed = false;
1143
1144                 if (!printed) {
1145                         error_msg("Unsupported regset size returned by "
1146                                   "PTRACE_GETREGSET: %zu",
1147                                   ARCH_IOVEC_FOR_GETREGSET.iov_len);
1148
1149                         printed = true;
1150                 }
1151
1152                 update_personality(tcp, 0);
1153         }
1154         }
1155 #  endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1156
1157         return get_regs_error;
1158
1159 # endif /* !HAVE_GETREGS_OLD */
1160
1161 #else /* !ptrace_getregset_or_getregs */
1162
1163 # warning get_regs is not implemented for this architecture yet
1164         return 0;
1165
1166 #endif /* !ptrace_getregset_or_getregs */
1167 }
1168
1169 #ifdef ptrace_setregset_or_setregs
1170 static int
1171 set_regs(pid_t pid)
1172 {
1173         return ptrace_setregset_or_setregs(pid);
1174 }
1175 #endif /* ptrace_setregset_or_setregs */
1176
1177 struct sysent_buf {
1178         struct tcb *tcp;
1179         struct_sysent ent;
1180         char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
1181 };
1182
1183 static void
1184 free_sysent_buf(void *ptr)
1185 {
1186         struct sysent_buf *s = ptr;
1187         s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1188         free(ptr);
1189 }
1190
1191 /*
1192  * Returns:
1193  * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1194  *    out silently" code.
1195  * 1: ok, continue in syscall_entering_decode().
1196  * other: error, syscall_entering_decode() should print error indicator
1197  *    ("????" etc) and return an appropriate code.
1198  */
1199 int
1200 get_scno(struct tcb *tcp)
1201 {
1202         if (get_regs(tcp) < 0)
1203                 return -1;
1204
1205         int rc = arch_get_scno(tcp);
1206         if (rc != 1)
1207                 return rc;
1208
1209         tcp->scno = shuffle_scno(tcp->scno);
1210
1211         if (scno_is_valid(tcp->scno)) {
1212                 tcp->s_ent = &sysent[tcp->scno];
1213                 tcp->qual_flg = qual_flags(tcp->scno);
1214         } else {
1215                 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1216
1217                 s->tcp = tcp;
1218                 s->ent.nargs = MAX_ARGS;
1219                 s->ent.sen = SEN_printargs;
1220                 s->ent.sys_func = printargs;
1221                 s->ent.sys_name = s->buf;
1222                 xsprintf(s->buf, "syscall_%#" PRI_klx, shuffle_scno(tcp->scno));
1223
1224                 tcp->s_ent = &s->ent;
1225                 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1226
1227                 set_tcb_priv_data(tcp, s, free_sysent_buf);
1228
1229                 debug_msg("pid %d invalid syscall %#" PRI_klx,
1230                           tcp->pid, shuffle_scno(tcp->scno));
1231         }
1232
1233         /*
1234          * We refrain from argument decoding during recovering
1235          * as tracee memory mappings has changed and the registers
1236          * are very likely pointing to garbage already.
1237          */
1238         if (recovering(tcp))
1239                 tcp->qual_flg |= QUAL_RAW;
1240
1241         return 1;
1242 }
1243
1244 #ifdef ptrace_getregset_or_getregs
1245 # define get_syscall_result_regs get_regs
1246 #else
1247 static int get_syscall_result_regs(struct tcb *);
1248 #endif
1249
1250 /* Returns:
1251  * 1: ok, continue in syscall_exiting_trace().
1252  * -1: error, syscall_exiting_trace() should print error indicator
1253  *    ("????" etc) and bail out.
1254  */
1255 static int
1256 get_syscall_result(struct tcb *tcp)
1257 {
1258         if (get_syscall_result_regs(tcp) < 0)
1259                 return -1;
1260         tcp->u_error = 0;
1261         get_error(tcp,
1262                   (!(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
1263                         || syscall_tampered(tcp))
1264                   && !syscall_tampered_nofail(tcp));
1265
1266         return 1;
1267 }
1268
1269 #include "get_scno.c"
1270 #include "set_scno.c"
1271 #include "get_syscall_args.c"
1272 #ifndef ptrace_getregset_or_getregs
1273 # include "get_syscall_result.c"
1274 #endif
1275 #include "get_error.c"
1276 #include "set_error.c"
1277 #ifdef HAVE_GETREGS_OLD
1278 # include "getregs_old.c"
1279 #endif
1280 #include "shuffle_scno.c"
1281
1282 const char *
1283 syscall_name(kernel_ulong_t scno)
1284 {
1285         return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
1286 }