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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * Copyright (c) 1999-2018 The strace developers.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "defs.h"
  36 #include "mmap_cache.h"
  37 #include "native_defs.h"
  38 #include "ptrace.h"
  39 #include "nsig.h"
  40 #include "number_set.h"
  41 #include <limits.h>
  42
  43 /* for struct iovec */
  44 #include <sys/uio.h>
  45
  46 /* for __X32_SYSCALL_BIT */
  47 #include <asm/unistd.h>
  48
  49 #include "regs.h"
  50
  51 #if defined(SPARC64)
  52 # undef PTRACE_GETREGS
  53 # define PTRACE_GETREGS PTRACE_GETREGS64
  54 # undef PTRACE_SETREGS
  55 # define PTRACE_SETREGS PTRACE_SETREGS64
  56 #endif
  57
  58 #ifndef NT_PRSTATUS
  59 # define NT_PRSTATUS 1
  60 #endif
  61
  62 #include "syscall.h"
  63 #include "xstring.h"
  64
  65 /* Define these shorthand notations to simplify the syscallent files. */
  66 #include "sysent_shorthand_defs.h"
  67
  68 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
  69
  70 const struct_sysent sysent0[] = {
  71 #include "syscallent.h"
  72 };
  73
  74 #if SUPPORTED_PERSONALITIES > 1
  75 # include PERSONALITY1_INCLUDE_FUNCS
  76 static const struct_sysent sysent1[] = {
  77 # include "syscallent1.h"
  78 };
  79 #endif
  80
  81 #if SUPPORTED_PERSONALITIES > 2
  82 # include PERSONALITY2_INCLUDE_FUNCS
  83 static const struct_sysent sysent2[] = {
  84 # include "syscallent2.h"
  85 };
  86 #endif
  87
  88 /* Now undef them since short defines cause wicked namespace pollution. */
  89 #include "sysent_shorthand_undefs.h"
  90
  91 /*
  92  * `ioctlent[012].h' files are automatically generated by the auxiliary
  93  * program `ioctlsort', such that the list is sorted by the `code' field.
  94  * This has the side-effect of resolving the _IO.. macros into
  95  * plain integers, eliminating the need to include here everything
  96  * in "/usr/include".
  97  */
  98
  99 const char *const errnoent0[] = {
 100 #include "errnoent.h"
 101 };
 102 const char *const signalent0[] = {
 103 #include "signalent.h"
 104 };
 105 const struct_ioctlent ioctlent0[] = {
 106 #include "ioctlent0.h"
 107 };
 108
 109 #if SUPPORTED_PERSONALITIES > 1
 110 static const char *const errnoent1[] = {
 111 # include "errnoent1.h"
 112 };
 113 static const char *const signalent1[] = {
 114 # include "signalent1.h"
 115 };
 116 static const struct_ioctlent ioctlent1[] = {
 117 # include "ioctlent1.h"
 118 };
 119 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
 120 static const struct_printers printers0 = {
 121 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
 122 };
 123 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
 124 static const struct_printers printers1 = {
 125 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
 126 };
 127 #endif
 128
 129 #if SUPPORTED_PERSONALITIES > 2
 130 static const char *const errnoent2[] = {
 131 # include "errnoent2.h"
 132 };
 133 static const char *const signalent2[] = {
 134 # include "signalent2.h"
 135 };
 136 static const struct_ioctlent ioctlent2[] = {
 137 # include "ioctlent2.h"
 138 };
 139 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
 140 static const struct_printers printers2 = {
 141 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
 142 };
 143 #endif
 144
 145 enum {
 146         nsyscalls0 = ARRAY_SIZE(sysent0)
 147 #if SUPPORTED_PERSONALITIES > 1
 148         , nsyscalls1 = ARRAY_SIZE(sysent1)
 149 # if SUPPORTED_PERSONALITIES > 2
 150         , nsyscalls2 = ARRAY_SIZE(sysent2)
 151 # endif
 152 #endif
 153 };
 154
 155 enum {
 156         nerrnos0 = ARRAY_SIZE(errnoent0)
 157 #if SUPPORTED_PERSONALITIES > 1
 158         , nerrnos1 = ARRAY_SIZE(errnoent1)
 159 # if SUPPORTED_PERSONALITIES > 2
 160         , nerrnos2 = ARRAY_SIZE(errnoent2)
 161 # endif
 162 #endif
 163 };
 164
 165 enum {
 166         nsignals0 = ARRAY_SIZE(signalent0)
 167 #if SUPPORTED_PERSONALITIES > 1
 168         , nsignals1 = ARRAY_SIZE(signalent1)
 169 # if SUPPORTED_PERSONALITIES > 2
 170         , nsignals2 = ARRAY_SIZE(signalent2)
 171 # endif
 172 #endif
 173 };
 174
 175 enum {
 176         nioctlents0 = ARRAY_SIZE(ioctlent0)
 177 #if SUPPORTED_PERSONALITIES > 1
 178         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 179 # if SUPPORTED_PERSONALITIES > 2
 180         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 181 # endif
 182 #endif
 183 };
 184
 185 #if SUPPORTED_PERSONALITIES > 1
 186 const struct_sysent *sysent = sysent0;
 187 const char *const *errnoent = errnoent0;
 188 const char *const *signalent = signalent0;
 189 const struct_ioctlent *ioctlent = ioctlent0;
 190 const struct_printers *printers = &printers0;
 191 #endif
 192
 193 unsigned nsyscalls = nsyscalls0;
 194 unsigned nerrnos = nerrnos0;
 195 unsigned nsignals = nsignals0;
 196 unsigned nioctlents = nioctlents0;
 197
 198 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 199         nsyscalls0,
 200 #if SUPPORTED_PERSONALITIES > 1
 201         nsyscalls1,
 202 #endif
 203 #if SUPPORTED_PERSONALITIES > 2
 204         nsyscalls2,
 205 #endif
 206 };
 207 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 208         sysent0,
 209 #if SUPPORTED_PERSONALITIES > 1
 210         sysent1,
 211 #endif
 212 #if SUPPORTED_PERSONALITIES > 2
 213         sysent2,
 214 #endif
 215 };
 216
 217 const char *const personality_names[] =
 218 # if defined X86_64
 219         {"64 bit", "32 bit", "x32"}
 220 # elif defined X32
 221         {"x32", "32 bit"}
 222 # elif SUPPORTED_PERSONALITIES == 2
 223         {"64 bit", "32 bit"}
 224 # else
 225         {STRINGIFY_VAL(__WORDSIZE) " bit"}
 226 # endif
 227         ;
 228
 229 #if SUPPORTED_PERSONALITIES > 1
 230
 231 unsigned current_personality;
 232
 233 # ifndef current_wordsize
 234 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
 235 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 236         PERSONALITY0_WORDSIZE,
 237         PERSONALITY1_WORDSIZE,
 238 # if SUPPORTED_PERSONALITIES > 2
 239         PERSONALITY2_WORDSIZE,
 240 # endif
 241 };
 242 # endif
 243
 244 # ifndef current_klongsize
 245 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
 246 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
 247         PERSONALITY0_KLONGSIZE,
 248         PERSONALITY1_KLONGSIZE,
 249 #  if SUPPORTED_PERSONALITIES > 2
 250         PERSONALITY2_KLONGSIZE,
 251 #  endif
 252 };
 253 # endif
 254
 255 void
 256 set_personality(unsigned int personality)
 257 {
 258         if (personality == current_personality)
 259                 return;
 260
 261         if (personality >= SUPPORTED_PERSONALITIES)
 262                 error_msg_and_die("Requested switch to unsupported personality "
 263                                   "%u", personality);
 264
 265         nsyscalls = nsyscall_vec[personality];
 266         sysent = sysent_vec[personality];
 267
 268         switch (personality) {
 269         case 0:
 270                 errnoent = errnoent0;
 271                 nerrnos = nerrnos0;
 272                 ioctlent = ioctlent0;
 273                 nioctlents = nioctlents0;
 274                 signalent = signalent0;
 275                 nsignals = nsignals0;
 276                 printers = &printers0;
 277                 break;
 278
 279         case 1:
 280                 errnoent = errnoent1;
 281                 nerrnos = nerrnos1;
 282                 ioctlent = ioctlent1;
 283                 nioctlents = nioctlents1;
 284                 signalent = signalent1;
 285                 nsignals = nsignals1;
 286                 printers = &printers1;
 287                 break;
 288
 289 # if SUPPORTED_PERSONALITIES > 2
 290         case 2:
 291                 errnoent = errnoent2;
 292                 nerrnos = nerrnos2;
 293                 ioctlent = ioctlent2;
 294                 nioctlents = nioctlents2;
 295                 signalent = signalent2;
 296                 nsignals = nsignals2;
 297                 printers = &printers2;
 298                 break;
 299 # endif
 300         }
 301
 302         current_personality = personality;
 303 # ifndef current_wordsize
 304         current_wordsize = personality_wordsize[personality];
 305 # endif
 306 # ifndef current_klongsize
 307         current_klongsize = personality_klongsize[personality];
 308 # endif
 309 }
 310
 311 static void
 312 update_personality(struct tcb *tcp, unsigned int personality)
 313 {
 314         static bool need_mpers_warning[] =
 315                 { false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
 316
 317         set_personality(personality);
 318
 319         if (personality == tcp->currpers)
 320                 return;
 321         tcp->currpers = personality;
 322
 323         if (!qflag) {
 324                 error_msg("[ Process PID=%d runs in %s mode. ]",
 325                           tcp->pid, personality_names[personality]);
 326         }
 327
 328         if (need_mpers_warning[personality]) {
 329                 error_msg("WARNING: Proper structure decoding for this "
 330                           "personality is not supported, please consider "
 331                           "building strace with mpers support enabled.");
 332                 need_mpers_warning[personality] = false;
 333         }
 334 }
 335 #endif
 336
 337 #ifdef SYS_socket_subcall
 338 static void
 339 decode_socket_subcall(struct tcb *tcp)
 340 {
 341         const int call = tcp->u_arg[0];
 342
 343         if (call < 1 || call >= SYS_socket_nsubcalls)
 344                 return;
 345
 346         const kernel_ulong_t scno = SYS_socket_subcall + call;
 347         const unsigned int nargs = sysent[scno].nargs;
 348         uint64_t buf[nargs];
 349
 350         if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
 351                 return;
 352
 353         tcp->scno = scno;
 354         tcp->qual_flg = qual_flags(scno);
 355         tcp->s_ent = &sysent[scno];
 356
 357         unsigned int i;
 358         for (i = 0; i < nargs; ++i)
 359                 tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
 360                                 ? ((uint32_t *) (void *) buf)[i] : buf[i];
 361 }
 362 #endif /* SYS_socket_subcall */
 363
 364 #ifdef SYS_ipc_subcall
 365 static void
 366 decode_ipc_subcall(struct tcb *tcp)
 367 {
 368         unsigned int call = tcp->u_arg[0];
 369         const unsigned int version = call >> 16;
 370
 371         if (version) {
 372 # if defined S390 || defined S390X
 373                 return;
 374 # else
 375 #  ifdef SPARC64
 376                 if (current_wordsize == 8)
 377                         return;
 378 #  endif
 379                 set_tcb_priv_ulong(tcp, version);
 380                 call &= 0xffff;
 381 # endif
 382         }
 383
 384         switch (call) {
 385                 case  1: case  2: case  3: case  4:
 386                 case 11: case 12: case 13: case 14:
 387                 case 21: case 22: case 23: case 24:
 388                         break;
 389                 default:
 390                         return;
 391         }
 392
 393         tcp->scno = SYS_ipc_subcall + call;
 394         tcp->qual_flg = qual_flags(tcp->scno);
 395         tcp->s_ent = &sysent[tcp->scno];
 396
 397         const unsigned int n = tcp->s_ent->nargs;
 398         unsigned int i;
 399         for (i = 0; i < n; i++)
 400                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 401 }
 402 #endif /* SYS_ipc_subcall */
 403
 404 #ifdef SYS_syscall_subcall
 405 static void
 406 decode_syscall_subcall(struct tcb *tcp)
 407 {
 408         if (!scno_is_valid(tcp->u_arg[0]))
 409                 return;
 410         tcp->scno = tcp->u_arg[0];
 411         tcp->qual_flg = qual_flags(tcp->scno);
 412         tcp->s_ent = &sysent[tcp->scno];
 413         memmove(&tcp->u_arg[0], &tcp->u_arg[1],
 414                 sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
 415 # ifdef LINUX_MIPSO32
 416         /*
 417          * Fetching the last arg of 7-arg syscalls (fadvise64_64
 418          * and sync_file_range) requires additional code,
 419          * see linux/mips/get_syscall_args.c
 420          */
 421         if (tcp->s_ent->nargs == MAX_ARGS) {
 422                 if (umoven(tcp,
 423                            mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
 424                            sizeof(tcp->u_arg[0]),
 425                            &tcp->u_arg[MAX_ARGS - 1]) < 0)
 426                 tcp->u_arg[MAX_ARGS - 1] = 0;
 427         }
 428 # endif /* LINUX_MIPSO32 */
 429 }
 430 #endif /* SYS_syscall_subcall */
 431
 432 static void
 433 dumpio(struct tcb *tcp)
 434 {
 435         if (syserror(tcp))
 436                 return;
 437
 438         int fd = tcp->u_arg[0];
 439         if (fd < 0)
 440                 return;
 441
 442         if (is_number_in_set(fd, read_set)) {
 443                 switch (tcp->s_ent->sen) {
 444                 case SEN_read:
 445                 case SEN_pread:
 446                 case SEN_recv:
 447                 case SEN_recvfrom:
 448                 case SEN_mq_timedreceive:
 449                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 450                         return;
 451                 case SEN_readv:
 452                 case SEN_preadv:
 453                 case SEN_preadv2:
 454                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
 455                                      tcp->u_rval);
 456                         return;
 457                 case SEN_recvmsg:
 458                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
 459                         return;
 460                 case SEN_recvmmsg:
 461                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 462                         return;
 463                 }
 464         }
 465         if (is_number_in_set(fd, write_set)) {
 466                 switch (tcp->s_ent->sen) {
 467                 case SEN_write:
 468                 case SEN_pwrite:
 469                 case SEN_send:
 470                 case SEN_sendto:
 471                 case SEN_mq_timedsend:
 472                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 473                         break;
 474                 case SEN_writev:
 475                 case SEN_pwritev:
 476                 case SEN_pwritev2:
 477                 case SEN_vmsplice:
 478                         dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
 479                         break;
 480                 case SEN_sendmsg:
 481                         dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
 482                         break;
 483                 case SEN_sendmmsg:
 484                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
 485                         break;
 486                 }
 487         }
 488 }
 489
 490 const char *
 491 err_name(unsigned long err)
 492 {
 493         if ((err < nerrnos) && errnoent[err])
 494                 return errnoent[err];
 495
 496         return NULL;
 497 }
 498
 499 static long get_regs(struct tcb *);
 500 static int get_syscall_args(struct tcb *);
 501 static int get_syscall_result(struct tcb *);
 502 static int arch_get_scno(struct tcb *tcp);
 503 static int arch_set_scno(struct tcb *, kernel_ulong_t);
 504 static void get_error(struct tcb *, const bool);
 505 static int arch_set_error(struct tcb *);
 506 static int arch_set_success(struct tcb *);
 507
 508 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
 509
 510 static struct inject_opts *
 511 tcb_inject_opts(struct tcb *tcp)
 512 {
 513         return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
 514                ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
 515 }
 516
 517
 518 static long
 519 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
 520 {
 521         if (!tcp->inject_vec[current_personality]) {
 522                 tcp->inject_vec[current_personality] =
 523                         xcalloc(nsyscalls, sizeof(**inject_vec));
 524                 memcpy(tcp->inject_vec[current_personality],
 525                        inject_vec[current_personality],
 526                        nsyscalls * sizeof(**inject_vec));
 527         }
 528
 529         struct inject_opts *opts = tcb_inject_opts(tcp);
 530
 531         if (!opts || opts->first == 0)
 532                 return 0;
 533
 534         --opts->first;
 535
 536         if (opts->first != 0)
 537                 return 0;
 538
 539         opts->first = opts->step;
 540
 541         if (!recovering(tcp)) {
 542                 if (opts->data.flags & INJECT_F_SIGNAL)
 543                         *signo = opts->data.signo;
 544                 if (opts->data.flags & INJECT_F_RETVAL &&
 545                     !arch_set_scno(tcp, -1))
 546                         tcp->flags |= TCB_TAMPERED;
 547         }
 548
 549         return 0;
 550 }
 551
 552 static long
 553 tamper_with_syscall_exiting(struct tcb *tcp)
 554 {
 555         if (!syserror(tcp)) {
 556                 error_msg("Failed to tamper with process %d: got no error "
 557                           "(return value %#" PRI_klx ")",
 558                           tcp->pid, tcp->u_rval);
 559
 560                 return 1;
 561         }
 562
 563         struct inject_opts *opts = tcb_inject_opts(tcp);
 564         bool update_tcb = false;
 565
 566         if (!opts)
 567                 return 0;
 568
 569         if (opts->data.rval >= 0) {
 570                 kernel_long_t u_rval = tcp->u_rval;
 571
 572                 tcp->u_rval = opts->data.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 = -opts->data.rval;
 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 USE_LIBUNWIND
 694         if (stack_trace_enabled) {
 695                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
 696                         unwind_capture_stacktrace(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                 gettimeofday(&tcp->etime, NULL);
 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 timeval *ptv)
 727 {
 728         /* Measure the exit time as early as possible to avoid errors. */
 729         if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
 730                 gettimeofday(ptv, NULL);
 731
 732         if (mmap_cache_is_enabled()) {
 733                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
 734                         mmap_cache_invalidate(tcp);
 735         }
 736
 737         if (filtered(tcp) || hide_log(tcp))
 738                 return 0;
 739
 740 #if SUPPORTED_PERSONALITIES > 1
 741         update_personality(tcp, tcp->currpers);
 742 #endif
 743
 744         return get_syscall_result(tcp);
 745 }
 746
 747 int
 748 syscall_exiting_trace(struct tcb *tcp, struct timeval tv, int res)
 749 {
 750         if (syscall_tampered(tcp))
 751                 tamper_with_syscall_exiting(tcp);
 752
 753         if (cflag) {
 754                 count_syscall(tcp, &tv);
 755                 if (cflag == CFLAG_ONLY_STATS) {
 756                         return 0;
 757                 }
 758         }
 759
 760         /* If not in -ff mode, and printing_tcp != tcp,
 761          * then the log currently does not end with output
 762          * of _our syscall entry_, but with something else.
 763          * We need to say which syscall's return is this.
 764          *
 765          * Forced reprinting via TCB_REPRINT is used only by
 766          * "strace -ff -oLOG test/threaded_execve" corner case.
 767          * It's the only case when -ff mode needs reprinting.
 768          */
 769         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
 770                 tcp->flags &= ~TCB_REPRINT;
 771                 printleader(tcp);
 772                 tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
 773         }
 774         printing_tcp = tcp;
 775
 776         tcp->s_prev_ent = NULL;
 777         if (res != 1) {
 778                 /* There was error in one of prior ptrace ops */
 779                 tprints(") ");
 780                 tabto();
 781                 tprints("= ? <unavailable>\n");
 782                 line_ended();
 783                 return res;
 784         }
 785         tcp->s_prev_ent = tcp->s_ent;
 786
 787         int sys_res = 0;
 788         if (raw(tcp)) {
 789                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
 790         } else {
 791         /* FIXME: not_failing_only (IOW, option -z) is broken:
 792          * failure of syscall is known only after syscall return.
 793          * Thus we end up with something like this on, say, ENOENT:
 794          *     open("does_not_exist", O_RDONLY <unfinished ...>
 795          *     {next syscall decode}
 796          * whereas the intended result is that open(...) line
 797          * is not shown at all.
 798          */
 799                 if (not_failing_only && tcp->u_error)
 800                         return 0;       /* ignore failed syscalls */
 801                 if (tcp->sys_func_rval & RVAL_DECODED)
 802                         sys_res = tcp->sys_func_rval;
 803                 else
 804                         sys_res = tcp->s_ent->sys_func(tcp);
 805         }
 806
 807         tprints(") ");
 808         tabto();
 809         unsigned long u_error = tcp->u_error;
 810         kernel_long_t u_rval;
 811
 812         if (raw(tcp)) {
 813                 if (u_error) {
 814                         tprintf("= -1 (errno %lu)", u_error);
 815                 } else {
 816                         tprintf("= %#" PRI_klx, tcp->u_rval);
 817                 }
 818                 if (syscall_tampered(tcp))
 819                         tprints(" (INJECTED)");
 820         } else if (!(sys_res & RVAL_NONE) && u_error) {
 821                 const char *u_error_str;
 822
 823                 switch (u_error) {
 824                 /* Blocked signals do not interrupt any syscalls.
 825                  * In this case syscalls don't return ERESTARTfoo codes.
 826                  *
 827                  * Deadly signals set to SIG_DFL interrupt syscalls
 828                  * and kill the process regardless of which of the codes below
 829                  * is returned by the interrupted syscall.
 830                  * In some cases, kernel forces a kernel-generated deadly
 831                  * signal to be unblocked and set to SIG_DFL (and thus cause
 832                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
 833                  * or SIGILL. (The alternative is to leave process spinning
 834                  * forever on the faulty instruction - not useful).
 835                  *
 836                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
 837                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
 838                  * but kernel will always restart them.
 839                  */
 840                 case ERESTARTSYS:
 841                         /* Most common type of signal-interrupted syscall exit code.
 842                          * The system call will be restarted with the same arguments
 843                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
 844                          */
 845                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
 846                         break;
 847                 case ERESTARTNOINTR:
 848                         /* Rare. For example, fork() returns this if interrupted.
 849                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
 850                          */
 851                         tprints("= ? ERESTARTNOINTR (To be restarted)");
 852                         break;
 853                 case ERESTARTNOHAND:
 854                         /* pause(), rt_sigsuspend() etc use this code.
 855                          * SA_RESTART is ignored (assumed not set):
 856                          * syscall won't restart (will return EINTR instead)
 857                          * even after signal with SA_RESTART set. However,
 858                          * after SIG_IGN or SIG_DFL signal it will restart
 859                          * (thus the name "restart only if has no handler").
 860                          */
 861                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
 862                         break;
 863                 case ERESTART_RESTARTBLOCK:
 864                         /* Syscalls like nanosleep(), poll() which can't be
 865                          * restarted with their original arguments use this
 866                          * code. Kernel will execute restart_syscall() instead,
 867                          * which changes arguments before restarting syscall.
 868                          * SA_RESTART is ignored (assumed not set) similarly
 869                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
 870                          * since restart data is saved in "restart block"
 871                          * in task struct, and if signal handler uses a syscall
 872                          * which in turn saves another such restart block,
 873                          * old data is lost and restart becomes impossible)
 874                          */
 875                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
 876                         break;
 877                 default:
 878                         u_rval = sys_res & RVAL_PRINT_ERR_VAL ?
 879                                  tcp->u_rval : -1;
 880                         u_error_str = err_name(u_error);
 881                         if (u_error_str)
 882                                 tprintf("= %" PRI_kld " %s (%s)",
 883                                         u_rval, u_error_str, strerror(u_error));
 884                         else
 885                                 tprintf("= %" PRI_kld " %lu (%s)",
 886                                         u_rval, u_error, strerror(u_error));
 887                         break;
 888                 }
 889                 if (syscall_tampered(tcp))
 890                         tprints(" (INJECTED)");
 891                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 892                         tprintf(" (%s)", tcp->auxstr);
 893         } else {
 894                 if (sys_res & RVAL_NONE)
 895                         tprints("= ?");
 896                 else {
 897                         switch (sys_res & RVAL_MASK) {
 898                         case RVAL_HEX:
 899 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 900                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 901                                         tprintf("= %#x",
 902                                                 (unsigned int) tcp->u_rval);
 903                                 } else
 904 #endif
 905                                 {
 906                                         tprintf("= %#" PRI_klx, tcp->u_rval);
 907                                 }
 908                                 break;
 909                         case RVAL_OCTAL:
 910                                 tprints("= ");
 911                                 print_numeric_long_umask(tcp->u_rval);
 912                                 break;
 913                         case RVAL_UDECIMAL:
 914 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
 915                                 if (current_klongsize < sizeof(tcp->u_rval)) {
 916                                         tprintf("= %u",
 917                                                 (unsigned int) tcp->u_rval);
 918                                 } else
 919 #endif
 920                                 {
 921                                         tprintf("= %" PRI_klu, tcp->u_rval);
 922                                 }
 923                                 break;
 924                         case RVAL_DECIMAL:
 925                                 tprintf("= %" PRI_kld, tcp->u_rval);
 926                                 break;
 927                         case RVAL_FD:
 928                                 if (show_fd_path) {
 929                                         tprints("= ");
 930                                         printfd(tcp, tcp->u_rval);
 931                                 } else
 932                                         tprintf("= %" PRI_kld, tcp->u_rval);
 933                                 break;
 934                         default:
 935                                 error_msg("invalid rval format");
 936                                 break;
 937                         }
 938                 }
 939                 if ((sys_res & RVAL_STR) && tcp->auxstr)
 940                         tprintf(" (%s)", tcp->auxstr);
 941                 if (syscall_tampered(tcp))
 942                         tprints(" (INJECTED)");
 943         }
 944         if (Tflag) {
 945                 tv_sub(&tv, &tv, &tcp->etime);
 946                 tprintf(" <%ld.%06ld>",
 947                         (long) tv.tv_sec, (long) tv.tv_usec);
 948         }
 949         tprints("\n");
 950         dumpio(tcp);
 951         line_ended();
 952
 953 #ifdef USE_LIBUNWIND
 954         if (stack_trace_enabled)
 955                 unwind_print_stacktrace(tcp);
 956 #endif
 957         return 0;
 958 }
 959
 960 void
 961 syscall_exiting_finish(struct tcb *tcp)
 962 {
 963         tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED);
 964         tcp->sys_func_rval = 0;
 965         free_tcb_priv_data(tcp);
 966 }
 967
 968 bool
 969 is_erestart(struct tcb *tcp)
 970 {
 971         switch (tcp->u_error) {
 972                 case ERESTARTSYS:
 973                 case ERESTARTNOINTR:
 974                 case ERESTARTNOHAND:
 975                 case ERESTART_RESTARTBLOCK:
 976                         return true;
 977                 default:
 978                         return false;
 979         }
 980 }
 981
 982 static unsigned long saved_u_error;
 983
 984 void
 985 temporarily_clear_syserror(struct tcb *tcp)
 986 {
 987         saved_u_error = tcp->u_error;
 988         tcp->u_error = 0;
 989 }
 990
 991 void
 992 restore_cleared_syserror(struct tcb *tcp)
 993 {
 994         tcp->u_error = saved_u_error;
 995 }
 996
 997 #include "arch_regs.c"
 998
 999 #if HAVE_ARCH_GETRVAL2
1000 # include "arch_getrval2.c"
1001 #endif
1002
1003 void
1004 print_pc(struct tcb *tcp)
1005 {
1006 #if defined ARCH_PC_REG
1007 # define ARCH_GET_PC 0
1008 #elif defined ARCH_PC_PEEK_ADDR
1009         kernel_ulong_t pc;
1010 # define ARCH_PC_REG pc
1011 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
1012 #else
1013 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1014 #endif
1015         if (get_regs(tcp) < 0 || ARCH_GET_PC)
1016                 tprints(current_wordsize == 4 ? "[????????] "
1017                                               : "[????????????????] ");
1018         else
1019                 tprintf(current_wordsize == 4
1020                         ? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1021                         (kernel_ulong_t) ARCH_PC_REG);
1022 }
1023
1024 #include "getregs_old.h"
1025
1026 #undef ptrace_getregset_or_getregs
1027 #undef ptrace_setregset_or_setregs
1028 #ifdef ARCH_REGS_FOR_GETREGSET
1029
1030 # define ptrace_getregset_or_getregs ptrace_getregset
1031 static long
1032 ptrace_getregset(pid_t pid)
1033 {
1034 # ifdef ARCH_IOVEC_FOR_GETREGSET
1035         /* variable iovec */
1036         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1037         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1038                       &ARCH_IOVEC_FOR_GETREGSET);
1039 # else
1040         /* constant iovec */
1041         static struct iovec io = {
1042                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1043                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1044         };
1045         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1046
1047 # endif
1048 }
1049
1050 # ifndef HAVE_GETREGS_OLD
1051 #  define ptrace_setregset_or_setregs ptrace_setregset
1052 static int
1053 ptrace_setregset(pid_t pid)
1054 {
1055 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1056         /* variable iovec */
1057         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1058                       &ARCH_IOVEC_FOR_GETREGSET);
1059 #  else
1060         /* constant iovec */
1061         static struct iovec io = {
1062                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1063                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1064         };
1065         return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1066 #  endif
1067 }
1068 # endif /* !HAVE_GETREGS_OLD */
1069
1070 #elif defined ARCH_REGS_FOR_GETREGS
1071
1072 # define ptrace_getregset_or_getregs ptrace_getregs
1073 static long
1074 ptrace_getregs(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_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1079 # else
1080         return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1081 # endif
1082 }
1083
1084 # ifndef HAVE_GETREGS_OLD
1085 #  define ptrace_setregset_or_setregs ptrace_setregs
1086 static int
1087 ptrace_setregs(pid_t pid)
1088 {
1089 #  if defined SPARC || defined SPARC64
1090         /* SPARC systems have the meaning of data and addr reversed */
1091         return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1092 #  else
1093         return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1094 #  endif
1095 }
1096 # endif /* !HAVE_GETREGS_OLD */
1097
1098 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1099
1100 #ifdef ptrace_getregset_or_getregs
1101 static long get_regs_error;
1102 #endif
1103
1104 void
1105 clear_regs(struct tcb *tcp)
1106 {
1107 #ifdef ptrace_getregset_or_getregs
1108         get_regs_error = -1;
1109 #endif
1110 }
1111
1112 static long
1113 get_regs(struct tcb *const tcp)
1114 {
1115 #ifdef ptrace_getregset_or_getregs
1116
1117         if (get_regs_error != -1)
1118                 return get_regs_error;
1119
1120 # ifdef HAVE_GETREGS_OLD
1121         /*
1122          * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1123          * fallback to getregs_old.
1124          */
1125         static int use_getregs_old;
1126         if (use_getregs_old < 0) {
1127                 return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1128         } else if (use_getregs_old == 0) {
1129                 get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1130                 if (get_regs_error >= 0) {
1131                         use_getregs_old = -1;
1132                         return get_regs_error;
1133                 }
1134                 if (errno == EPERM || errno == ESRCH)
1135                         return get_regs_error;
1136                 use_getregs_old = 1;
1137         }
1138         return get_regs_error = getregs_old(tcp);
1139 # else /* !HAVE_GETREGS_OLD */
1140         /* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1141         get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1142
1143 #  if defined ARCH_PERSONALITY_0_IOV_SIZE
1144         if (get_regs_error)
1145                 return get_regs_error;
1146
1147         switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1148         case ARCH_PERSONALITY_0_IOV_SIZE:
1149                 update_personality(tcp, 0);
1150                 break;
1151         case ARCH_PERSONALITY_1_IOV_SIZE:
1152                 update_personality(tcp, 1);
1153                 break;
1154         default: {
1155                 static bool printed = false;
1156
1157                 if (!printed) {
1158                         error_msg("Unsupported regset size returned by "
1159                                   "PTRACE_GETREGSET: %zu",
1160                                   ARCH_IOVEC_FOR_GETREGSET.iov_len);
1161
1162                         printed = true;
1163                 }
1164
1165                 update_personality(tcp, 0);
1166         }
1167         }
1168 #  endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1169
1170         return get_regs_error;
1171
1172 # endif /* !HAVE_GETREGS_OLD */
1173
1174 #else /* !ptrace_getregset_or_getregs */
1175
1176 # warning get_regs is not implemented for this architecture yet
1177         return 0;
1178
1179 #endif /* !ptrace_getregset_or_getregs */
1180 }
1181
1182 #ifdef ptrace_setregset_or_setregs
1183 static int
1184 set_regs(pid_t pid)
1185 {
1186         return ptrace_setregset_or_setregs(pid);
1187 }
1188 #endif /* ptrace_setregset_or_setregs */
1189
1190 struct sysent_buf {
1191         struct tcb *tcp;
1192         struct_sysent ent;
1193         char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
1194 };
1195
1196 static void
1197 free_sysent_buf(void *ptr)
1198 {
1199         struct sysent_buf *s = ptr;
1200         s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1201         free(ptr);
1202 }
1203
1204 /*
1205  * Returns:
1206  * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1207  *    out silently" code.
1208  * 1: ok, continue in syscall_entering_decode().
1209  * other: error, syscall_entering_decode() should print error indicator
1210  *    ("????" etc) and return an appropriate code.
1211  */
1212 int
1213 get_scno(struct tcb *tcp)
1214 {
1215         if (get_regs(tcp) < 0)
1216                 return -1;
1217
1218         int rc = arch_get_scno(tcp);
1219         if (rc != 1)
1220                 return rc;
1221
1222         tcp->scno = shuffle_scno(tcp->scno);
1223
1224         if (scno_is_valid(tcp->scno)) {
1225                 tcp->s_ent = &sysent[tcp->scno];
1226                 tcp->qual_flg = qual_flags(tcp->scno);
1227         } else {
1228                 struct sysent_buf *s = xcalloc(1, sizeof(*s));
1229
1230                 s->tcp = tcp;
1231                 s->ent.nargs = MAX_ARGS;
1232                 s->ent.sen = SEN_printargs;
1233                 s->ent.sys_func = printargs;
1234                 s->ent.sys_name = s->buf;
1235                 xsprintf(s->buf, "syscall_%#" PRI_klx, shuffle_scno(tcp->scno));
1236
1237                 tcp->s_ent = &s->ent;
1238                 tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1239
1240                 set_tcb_priv_data(tcp, s, free_sysent_buf);
1241
1242                 debug_msg("pid %d invalid syscall %#" PRI_klx,
1243                           tcp->pid, shuffle_scno(tcp->scno));
1244         }
1245
1246         /*
1247          * We refrain from argument decoding during recovering
1248          * as tracee memory mappings has changed and the registers
1249          * are very likely pointing to garbage already.
1250          */
1251         if (recovering(tcp))
1252                 tcp->qual_flg |= QUAL_RAW;
1253
1254         return 1;
1255 }
1256
1257 #ifdef ptrace_getregset_or_getregs
1258 # define get_syscall_result_regs get_regs
1259 #else
1260 static int get_syscall_result_regs(struct tcb *);
1261 #endif
1262
1263 /* Returns:
1264  * 1: ok, continue in syscall_exiting_trace().
1265  * -1: error, syscall_exiting_trace() should print error indicator
1266  *    ("????" etc) and bail out.
1267  */
1268 static int
1269 get_syscall_result(struct tcb *tcp)
1270 {
1271         if (get_syscall_result_regs(tcp) < 0)
1272                 return -1;
1273         tcp->u_error = 0;
1274         get_error(tcp,
1275                   !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
1276                         || syscall_tampered(tcp));
1277
1278         return 1;
1279 }
1280
1281 #include "get_scno.c"
1282 #include "set_scno.c"
1283 #include "get_syscall_args.c"
1284 #ifndef ptrace_getregset_or_getregs
1285 # include "get_syscall_result.c"
1286 #endif
1287 #include "get_error.c"
1288 #include "set_error.c"
1289 #ifdef HAVE_GETREGS_OLD
1290 # include "getregs_old.c"
1291 #endif
1292 #include "shuffle_scno.c"
1293
1294 const char *
1295 syscall_name(kernel_ulong_t scno)
1296 {
1297         return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
1298 }