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