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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "defs.h"
  35 #include <sys/param.h>
  36
  37 /* for struct iovec */
  38 #include <sys/uio.h>
  39
  40 #include "regs.h"
  41 #include "ptrace.h"
  42
  43 #if defined(SPARC64)
  44 # undef PTRACE_GETREGS
  45 # define PTRACE_GETREGS PTRACE_GETREGS64
  46 # undef PTRACE_SETREGS
  47 # define PTRACE_SETREGS PTRACE_SETREGS64
  48 #endif
  49
  50 #if defined SPARC64
  51 # include <asm/psrcompat.h>
  52 #elif defined SPARC
  53 # include <asm/psr.h>
  54 #endif
  55
  56 #ifdef IA64
  57 # include <asm/rse.h>
  58 #endif
  59
  60 #ifndef NT_PRSTATUS
  61 # define NT_PRSTATUS 1
  62 #endif
  63
  64 #ifndef NSIG
  65 # warning: NSIG is not defined, using 32
  66 # define NSIG 32
  67 #endif
  68
  69 #include "syscall.h"
  70
  71 /* Define these shorthand notations to simplify the syscallent files. */
  72 #define TD TRACE_DESC
  73 #define TF TRACE_FILE
  74 #define TI TRACE_IPC
  75 #define TN TRACE_NETWORK
  76 #define TP TRACE_PROCESS
  77 #define TS TRACE_SIGNAL
  78 #define TM TRACE_MEMORY
  79 #define NF SYSCALL_NEVER_FAILS
  80 #define MA MAX_ARGS
  81 #define SI STACKTRACE_INVALIDATE_CACHE
  82 #define SE STACKTRACE_CAPTURE_ON_ENTER
  83
  84 const struct_sysent sysent0[] = {
  85 #include "syscallent.h"
  86 };
  87
  88 #if SUPPORTED_PERSONALITIES > 1
  89 static const struct_sysent sysent1[] = {
  90 # include "syscallent1.h"
  91 };
  92 #endif
  93
  94 #if SUPPORTED_PERSONALITIES > 2
  95 static const struct_sysent sysent2[] = {
  96 # include "syscallent2.h"
  97 };
  98 #endif
  99
 100 /* Now undef them since short defines cause wicked namespace pollution. */
 101 #undef TD
 102 #undef TF
 103 #undef TI
 104 #undef TN
 105 #undef TP
 106 #undef TS
 107 #undef TM
 108 #undef NF
 109 #undef MA
 110 #undef SI
 111 #undef SE
 112
 113 /*
 114  * `ioctlent[012].h' files are automatically generated by the auxiliary
 115  * program `ioctlsort', such that the list is sorted by the `code' field.
 116  * This has the side-effect of resolving the _IO.. macros into
 117  * plain integers, eliminating the need to include here everything
 118  * in "/usr/include".
 119  */
 120
 121 const char *const errnoent0[] = {
 122 #include "errnoent.h"
 123 };
 124 const char *const signalent0[] = {
 125 #include "signalent.h"
 126 };
 127 const struct_ioctlent ioctlent0[] = {
 128 #include "ioctlent0.h"
 129 };
 130
 131 #if SUPPORTED_PERSONALITIES > 1
 132 static const char *const errnoent1[] = {
 133 # include "errnoent1.h"
 134 };
 135 static const char *const signalent1[] = {
 136 # include "signalent1.h"
 137 };
 138 static const struct_ioctlent ioctlent1[] = {
 139 # include "ioctlent1.h"
 140 };
 141 #endif
 142
 143 #if SUPPORTED_PERSONALITIES > 2
 144 static const char *const errnoent2[] = {
 145 # include "errnoent2.h"
 146 };
 147 static const char *const signalent2[] = {
 148 # include "signalent2.h"
 149 };
 150 static const struct_ioctlent ioctlent2[] = {
 151 # include "ioctlent2.h"
 152 };
 153 #endif
 154
 155 enum {
 156         nsyscalls0 = ARRAY_SIZE(sysent0)
 157 #if SUPPORTED_PERSONALITIES > 1
 158         , nsyscalls1 = ARRAY_SIZE(sysent1)
 159 # if SUPPORTED_PERSONALITIES > 2
 160         , nsyscalls2 = ARRAY_SIZE(sysent2)
 161 # endif
 162 #endif
 163 };
 164
 165 enum {
 166         nerrnos0 = ARRAY_SIZE(errnoent0)
 167 #if SUPPORTED_PERSONALITIES > 1
 168         , nerrnos1 = ARRAY_SIZE(errnoent1)
 169 # if SUPPORTED_PERSONALITIES > 2
 170         , nerrnos2 = ARRAY_SIZE(errnoent2)
 171 # endif
 172 #endif
 173 };
 174
 175 enum {
 176         nsignals0 = ARRAY_SIZE(signalent0)
 177 #if SUPPORTED_PERSONALITIES > 1
 178         , nsignals1 = ARRAY_SIZE(signalent1)
 179 # if SUPPORTED_PERSONALITIES > 2
 180         , nsignals2 = ARRAY_SIZE(signalent2)
 181 # endif
 182 #endif
 183 };
 184
 185 enum {
 186         nioctlents0 = ARRAY_SIZE(ioctlent0)
 187 #if SUPPORTED_PERSONALITIES > 1
 188         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 189 # if SUPPORTED_PERSONALITIES > 2
 190         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 191 # endif
 192 #endif
 193 };
 194
 195 #if SUPPORTED_PERSONALITIES > 1
 196 const struct_sysent *sysent = sysent0;
 197 const char *const *errnoent = errnoent0;
 198 const char *const *signalent = signalent0;
 199 const struct_ioctlent *ioctlent = ioctlent0;
 200 #endif
 201 unsigned nsyscalls = nsyscalls0;
 202 unsigned nerrnos = nerrnos0;
 203 unsigned nsignals = nsignals0;
 204 unsigned nioctlents = nioctlents0;
 205
 206 unsigned num_quals;
 207 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
 208
 209 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 210         nsyscalls0,
 211 #if SUPPORTED_PERSONALITIES > 1
 212         nsyscalls1,
 213 #endif
 214 #if SUPPORTED_PERSONALITIES > 2
 215         nsyscalls2,
 216 #endif
 217 };
 218 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 219         sysent0,
 220 #if SUPPORTED_PERSONALITIES > 1
 221         sysent1,
 222 #endif
 223 #if SUPPORTED_PERSONALITIES > 2
 224         sysent2,
 225 #endif
 226 };
 227
 228 enum {
 229         MAX_NSYSCALLS1 = (nsyscalls0
 230 #if SUPPORTED_PERSONALITIES > 1
 231                         > nsyscalls1 ? nsyscalls0 : nsyscalls1
 232 #endif
 233                         ),
 234         MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
 235 #if SUPPORTED_PERSONALITIES > 2
 236                         > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
 237 #endif
 238                         ),
 239         MAX_NSYSCALLS = MAX_NSYSCALLS2,
 240         /* We are ready for arches with up to 255 signals,
 241          * even though the largest known signo is on MIPS and it is 128.
 242          * The number of existing syscalls on all arches is
 243          * larger that 255 anyway, so it is just a pedantic matter.
 244          */
 245         MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
 246 };
 247
 248 #if SUPPORTED_PERSONALITIES > 1
 249 unsigned current_personality;
 250
 251 # ifndef current_wordsize
 252 unsigned current_wordsize;
 253 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 254         PERSONALITY0_WORDSIZE,
 255         PERSONALITY1_WORDSIZE,
 256 # if SUPPORTED_PERSONALITIES > 2
 257         PERSONALITY2_WORDSIZE,
 258 # endif
 259 };
 260 # endif
 261
 262 void
 263 set_personality(int 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                 break;
 277
 278         case 1:
 279                 errnoent = errnoent1;
 280                 nerrnos = nerrnos1;
 281                 ioctlent = ioctlent1;
 282                 nioctlents = nioctlents1;
 283                 signalent = signalent1;
 284                 nsignals = nsignals1;
 285                 break;
 286
 287 # if SUPPORTED_PERSONALITIES > 2
 288         case 2:
 289                 errnoent = errnoent2;
 290                 nerrnos = nerrnos2;
 291                 ioctlent = ioctlent2;
 292                 nioctlents = nioctlents2;
 293                 signalent = signalent2;
 294                 nsignals = nsignals2;
 295                 break;
 296 # endif
 297         }
 298
 299         current_personality = personality;
 300 # ifndef current_wordsize
 301         current_wordsize = personality_wordsize[personality];
 302 # endif
 303 }
 304
 305 static void
 306 update_personality(struct tcb *tcp, unsigned int personality)
 307 {
 308         if (personality == current_personality)
 309                 return;
 310         set_personality(personality);
 311
 312         if (personality == tcp->currpers)
 313                 return;
 314         tcp->currpers = personality;
 315
 316 # if defined(POWERPC64)
 317         if (!qflag) {
 318                 static const char *const names[] = {"64 bit", "32 bit"};
 319                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 320                         tcp->pid, names[personality]);
 321         }
 322 # elif defined(X86_64)
 323         if (!qflag) {
 324                 static const char *const names[] = {"64 bit", "32 bit", "x32"};
 325                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 326                         tcp->pid, names[personality]);
 327         }
 328 # elif defined(X32)
 329         if (!qflag) {
 330                 static const char *const names[] = {"x32", "32 bit"};
 331                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 332                         tcp->pid, names[personality]);
 333         }
 334 # elif defined(AARCH64)
 335         if (!qflag) {
 336                 static const char *const names[] = {"32-bit", "AArch64"};
 337                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 338                         tcp->pid, names[personality]);
 339         }
 340 # elif defined(TILE)
 341         if (!qflag) {
 342                 static const char *const names[] = {"64-bit", "32-bit"};
 343                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 344                         tcp->pid, names[personality]);
 345         }
 346 # endif
 347 }
 348 #endif
 349
 350 static int qual_syscall(), qual_signal(), qual_desc();
 351
 352 static const struct qual_options {
 353         unsigned int bitflag;
 354         const char *option_name;
 355         int (*qualify)(const char *, int, int);
 356         const char *argument_name;
 357 } qual_options[] = {
 358         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 359         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 360         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 361         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 362         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 363         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 364         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 365         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 366         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 367         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 368         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 369         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 370         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 371         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 372         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 373         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 374         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 375         { 0,            NULL,           NULL,           NULL            },
 376 };
 377
 378 static void
 379 reallocate_qual(const unsigned int n)
 380 {
 381         unsigned p;
 382         qualbits_t *qp;
 383         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 384                 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t));
 385                 if (!qp)
 386                         die_out_of_memory();
 387                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 388         }
 389         num_quals = n;
 390 }
 391
 392 static void
 393 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 394 {
 395         int p;
 396
 397         if (num_quals <= n)
 398                 reallocate_qual(n + 1);
 399
 400         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 401                 if (pers == p || pers < 0) {
 402                         if (not)
 403                                 qual_vec[p][n] &= ~bitflag;
 404                         else
 405                                 qual_vec[p][n] |= bitflag;
 406                 }
 407         }
 408 }
 409
 410 static int
 411 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 412 {
 413         int p;
 414         unsigned int i;
 415         int rc = -1;
 416
 417         if (*s >= '0' && *s <= '9') {
 418                 i = string_to_uint(s);
 419                 if (i >= MAX_NSYSCALLS)
 420                         return -1;
 421                 qualify_one(i, bitflag, not, -1);
 422                 return 0;
 423         }
 424
 425         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 426                 for (i = 0; i < nsyscall_vec[p]; i++) {
 427                         if (sysent_vec[p][i].sys_name
 428                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 429                         ) {
 430                                 qualify_one(i, bitflag, not, p);
 431                                 rc = 0;
 432                         }
 433                 }
 434         }
 435
 436         return rc;
 437 }
 438
 439 static int
 440 qual_signal(const char *s, const unsigned int bitflag, const int not)
 441 {
 442         unsigned int i;
 443
 444         if (*s >= '0' && *s <= '9') {
 445                 int signo = string_to_uint(s);
 446                 if (signo < 0 || signo > 255)
 447                         return -1;
 448                 qualify_one(signo, bitflag, not, -1);
 449                 return 0;
 450         }
 451         if (strncasecmp(s, "SIG", 3) == 0)
 452                 s += 3;
 453         for (i = 0; i <= NSIG; i++) {
 454                 if (strcasecmp(s, signame(i) + 3) == 0) {
 455                         qualify_one(i, bitflag, not, -1);
 456                         return 0;
 457                 }
 458         }
 459         return -1;
 460 }
 461
 462 static int
 463 qual_desc(const char *s, const unsigned int bitflag, const int not)
 464 {
 465         if (*s >= '0' && *s <= '9') {
 466                 int desc = string_to_uint(s);
 467                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 468                         return -1;
 469                 qualify_one(desc, bitflag, not, -1);
 470                 return 0;
 471         }
 472         return -1;
 473 }
 474
 475 static int
 476 lookup_class(const char *s)
 477 {
 478         if (strcmp(s, "file") == 0)
 479                 return TRACE_FILE;
 480         if (strcmp(s, "ipc") == 0)
 481                 return TRACE_IPC;
 482         if (strcmp(s, "network") == 0)
 483                 return TRACE_NETWORK;
 484         if (strcmp(s, "process") == 0)
 485                 return TRACE_PROCESS;
 486         if (strcmp(s, "signal") == 0)
 487                 return TRACE_SIGNAL;
 488         if (strcmp(s, "desc") == 0)
 489                 return TRACE_DESC;
 490         if (strcmp(s, "memory") == 0)
 491                 return TRACE_MEMORY;
 492         return -1;
 493 }
 494
 495 void
 496 qualify(const char *s)
 497 {
 498         const struct qual_options *opt;
 499         char *copy;
 500         const char *p;
 501         int not;
 502         unsigned int i;
 503
 504         if (num_quals == 0)
 505                 reallocate_qual(MIN_QUALS);
 506
 507         opt = &qual_options[0];
 508         for (i = 0; (p = qual_options[i].option_name); i++) {
 509                 unsigned int len = strlen(p);
 510                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 511                         opt = &qual_options[i];
 512                         s += len + 1;
 513                         break;
 514                 }
 515         }
 516         not = 0;
 517         if (*s == '!') {
 518                 not = 1;
 519                 s++;
 520         }
 521         if (strcmp(s, "none") == 0) {
 522                 not = 1 - not;
 523                 s = "all";
 524         }
 525         if (strcmp(s, "all") == 0) {
 526                 for (i = 0; i < num_quals; i++) {
 527                         qualify_one(i, opt->bitflag, not, -1);
 528                 }
 529                 return;
 530         }
 531         for (i = 0; i < num_quals; i++) {
 532                 qualify_one(i, opt->bitflag, !not, -1);
 533         }
 534         copy = strdup(s);
 535         if (!copy)
 536                 die_out_of_memory();
 537         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 538                 int n;
 539                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 540                         unsigned pers;
 541                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 542                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 543                                         if (sysent_vec[pers][i].sys_flags & n)
 544                                                 qualify_one(i, opt->bitflag, not, pers);
 545                         }
 546                         continue;
 547                 }
 548                 if (opt->qualify(p, opt->bitflag, not)) {
 549                         error_msg_and_die("invalid %s '%s'",
 550                                 opt->argument_name, p);
 551                 }
 552         }
 553         free(copy);
 554         return;
 555 }
 556
 557 #ifdef SYS_socket_subcall
 558 static void
 559 decode_socket_subcall(struct tcb *tcp)
 560 {
 561         unsigned long addr;
 562         unsigned int i, n, size;
 563
 564         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 565                 return;
 566
 567         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 568         tcp->qual_flg = qual_flags[tcp->scno];
 569         tcp->s_ent = &sysent[tcp->scno];
 570         addr = tcp->u_arg[1];
 571         size = current_wordsize;
 572         n = tcp->s_ent->nargs;
 573         for (i = 0; i < n; ++i) {
 574                 if (size == sizeof(int)) {
 575                         unsigned int arg;
 576                         if (umove(tcp, addr, &arg) < 0)
 577                                 arg = 0;
 578                         tcp->u_arg[i] = arg;
 579                 }
 580                 else {
 581                         unsigned long arg;
 582                         if (umove(tcp, addr, &arg) < 0)
 583                                 arg = 0;
 584                         tcp->u_arg[i] = arg;
 585                 }
 586                 addr += size;
 587         }
 588 }
 589 #endif
 590
 591 #ifdef SYS_ipc_subcall
 592 static void
 593 decode_ipc_subcall(struct tcb *tcp)
 594 {
 595         unsigned int i, n;
 596
 597         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 598                 return;
 599
 600         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 601         tcp->qual_flg = qual_flags[tcp->scno];
 602         tcp->s_ent = &sysent[tcp->scno];
 603         n = tcp->s_ent->nargs;
 604         for (i = 0; i < n; i++)
 605                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 606 }
 607 #endif
 608
 609 int
 610 printargs(struct tcb *tcp)
 611 {
 612         if (entering(tcp)) {
 613                 int i;
 614                 int n = tcp->s_ent->nargs;
 615                 for (i = 0; i < n; i++)
 616                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 617         }
 618         return 0;
 619 }
 620
 621 int
 622 printargs_lu(struct tcb *tcp)
 623 {
 624         if (entering(tcp)) {
 625                 int i;
 626                 int n = tcp->s_ent->nargs;
 627                 for (i = 0; i < n; i++)
 628                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 629         }
 630         return 0;
 631 }
 632
 633 int
 634 printargs_ld(struct tcb *tcp)
 635 {
 636         if (entering(tcp)) {
 637                 int i;
 638                 int n = tcp->s_ent->nargs;
 639                 for (i = 0; i < n; i++)
 640                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 641         }
 642         return 0;
 643 }
 644
 645 #if defined(I386)
 646 static struct user_regs_struct i386_regs;
 647 long *const i386_esp_ptr = &i386_regs.esp;
 648 # define ARCH_REGS_FOR_GETREGS i386_regs
 649 #elif defined(X86_64) || defined(X32)
 650 /*
 651  * On i386, pt_regs and user_regs_struct are the same,
 652  * but on 64 bit x86, user_regs_struct has six more fields:
 653  * fs_base, gs_base, ds, es, fs, gs.
 654  * PTRACE_GETREGS fills them too, so struct pt_regs would overflow.
 655  */
 656 struct i386_user_regs_struct {
 657         uint32_t ebx;
 658         uint32_t ecx;
 659         uint32_t edx;
 660         uint32_t esi;
 661         uint32_t edi;
 662         uint32_t ebp;
 663         uint32_t eax;
 664         uint32_t xds;
 665         uint32_t xes;
 666         uint32_t xfs;
 667         uint32_t xgs;
 668         uint32_t orig_eax;
 669         uint32_t eip;
 670         uint32_t xcs;
 671         uint32_t eflags;
 672         uint32_t esp;
 673         uint32_t xss;
 674 };
 675 static union {
 676         struct user_regs_struct      x86_64_r;
 677         struct i386_user_regs_struct i386_r;
 678 } x86_regs_union;
 679 # define x86_64_regs x86_regs_union.x86_64_r
 680 # define i386_regs   x86_regs_union.i386_r
 681 uint32_t *const i386_esp_ptr = &i386_regs.esp;
 682 uint64_t *const x86_64_rsp_ptr = (uint64_t *) &x86_64_regs.rsp;
 683 static struct iovec x86_io = {
 684         .iov_base = &x86_regs_union
 685 };
 686 # define ARCH_REGS_FOR_GETREGSET x86_regs_union
 687 # define ARCH_IOVEC_FOR_GETREGSET x86_io
 688 #elif defined(IA64)
 689 static struct pt_all_user_regs ia64_regs;
 690 unsigned long *const ia64_frame_ptr = &ia64_regs.gr[12];
 691 # define IA64_PSR_IS    ((long)1 << 34)
 692 # define ia64_ia32mode  (ia64_regs.cr_ipsr & IA64_PSR_IS)
 693 # define ARCH_REGS_FOR_GETREGS ia64_regs
 694 #elif defined(POWERPC)
 695 struct pt_regs ppc_regs; /* not static */
 696 # define ARCH_REGS_FOR_GETREGS ppc_regs
 697 #elif defined(M68K)
 698 static long m68k_d0;
 699 #elif defined(BFIN)
 700 static long bfin_r0;
 701 #elif defined(ARM)
 702 static struct pt_regs arm_regs;
 703 long *const arm_sp_ptr = &arm_regs.ARM_sp;
 704 # define ARCH_REGS_FOR_GETREGS arm_regs
 705 #elif defined(AARCH64)
 706 struct arm_pt_regs {
 707         int uregs[18];
 708 };
 709 # define ARM_cpsr       uregs[16]
 710 # define ARM_pc         uregs[15]
 711 # define ARM_lr         uregs[14]
 712 # define ARM_sp         uregs[13]
 713 # define ARM_ip         uregs[12]
 714 # define ARM_fp         uregs[11]
 715 # define ARM_r10        uregs[10]
 716 # define ARM_r9         uregs[9]
 717 # define ARM_r8         uregs[8]
 718 # define ARM_r7         uregs[7]
 719 # define ARM_r6         uregs[6]
 720 # define ARM_r5         uregs[5]
 721 # define ARM_r4         uregs[4]
 722 # define ARM_r3         uregs[3]
 723 # define ARM_r2         uregs[2]
 724 # define ARM_r1         uregs[1]
 725 # define ARM_r0         uregs[0]
 726 # define ARM_ORIG_r0    uregs[17]
 727 static union {
 728         struct user_pt_regs aarch64_r;
 729         struct arm_pt_regs  arm_r;
 730 } arm_regs_union;
 731 # define aarch64_regs arm_regs_union.aarch64_r
 732 # define arm_regs     arm_regs_union.arm_r
 733 uint64_t *const aarch64_sp_ptr = (uint64_t *) &aarch64_regs.sp;
 734 uint32_t *const arm_sp_ptr = (uint32_t *) &arm_regs.ARM_sp;
 735 static struct iovec aarch64_io = {
 736         .iov_base = &arm_regs_union
 737 };
 738 # define ARCH_REGS_FOR_GETREGSET arm_regs_union
 739 # define ARCH_IOVEC_FOR_GETREGSET aarch64_io
 740 #elif defined(ALPHA)
 741 static long alpha_r0;
 742 static long alpha_a3;
 743 #elif defined(AVR32)
 744 static struct pt_regs avr32_regs;
 745 # define ARCH_REGS_FOR_GETREGS avr32_regs
 746 #elif defined(SPARC) || defined(SPARC64)
 747 struct pt_regs sparc_regs; /* not static */
 748 # define ARCH_REGS_FOR_GETREGS sparc_regs
 749 #elif defined(MIPS)
 750 struct mips_regs mips_regs; /* not static */
 751 /* PTRACE_GETREGS on MIPS is available since linux v2.6.15. */
 752 # define ARCH_REGS_FOR_GETREGS mips_regs
 753 #elif defined(S390) || defined(S390X)
 754 /* PTRACE_GETREGSET on S390 is available since linux v2.6.27. */
 755 static struct user_regs_struct s390_regset;
 756 unsigned long *const s390_frame_ptr = &s390_regset.gprs[15];
 757 # define ARCH_REGS_FOR_GETREGSET s390_regset
 758 #elif defined(HPPA)
 759 static long hppa_r28;
 760 #elif defined(SH)
 761 static long sh_r0;
 762 #elif defined(SH64)
 763 static long sh64_r9;
 764 #elif defined(CRISV10) || defined(CRISV32)
 765 static long cris_r10;
 766 #elif defined(TILE)
 767 struct pt_regs tile_regs; /* not static */
 768 # define ARCH_REGS_FOR_GETREGS tile_regs
 769 #elif defined(MICROBLAZE)
 770 static long microblaze_r3;
 771 #elif defined(OR1K)
 772 static struct user_regs_struct or1k_regs;
 773 # define ARCH_REGS_FOR_GETREGSET or1k_regs
 774 #elif defined(METAG)
 775 static struct user_gp_regs metag_regs;
 776 # define ARCH_REGS_FOR_GETREGSET metag_regs
 777 #elif defined(XTENSA)
 778 static long xtensa_a2;
 779 # elif defined(ARC)
 780 static struct user_regs_struct arc_regs;
 781 # define ARCH_REGS_FOR_GETREGSET arc_regs
 782 #endif
 783
 784 static long get_regs_error;
 785
 786 #if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH)
 787 long
 788 getrval2(struct tcb *tcp)
 789 {
 790         long val;
 791
 792 # if defined(SPARC) || defined(SPARC64)
 793         val = sparc_regs.u_regs[U_REG_O1];
 794 # elif defined(SH)
 795         if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0)
 796                 return -1;
 797 # elif defined(IA64)
 798         val = ia64_regs.gr[9];
 799 # endif
 800
 801         return val;
 802 }
 803 #endif
 804
 805 void
 806 print_pc(struct tcb *tcp)
 807 {
 808         const char *fmt;
 809         const char *bad;
 810
 811 #ifdef current_wordsize
 812 # define pc_wordsize current_wordsize
 813 #else
 814 # define pc_wordsize personality_wordsize[tcp->currpers]
 815 #endif
 816
 817         if (pc_wordsize == 4) {
 818                 fmt = "[%08lx] ";
 819                 bad = "[????????] ";
 820         } else {
 821                 fmt = "[%016lx] ";
 822                 bad = "[????????????????] ";
 823         }
 824
 825 #undef pc_wordsize
 826 #define PRINTBADPC tprints(bad)
 827
 828         if (get_regs_error) {
 829                 PRINTBADPC;
 830                 return;
 831         }
 832
 833 #if defined(I386)
 834         tprintf(fmt, i386_regs.eip);
 835 #elif defined(X86_64) || defined(X32)
 836         if (x86_io.iov_len == sizeof(i386_regs))
 837                 tprintf(fmt, (unsigned long) i386_regs.eip);
 838         else
 839                 tprintf(fmt, (unsigned long) x86_64_regs.rip);
 840 #elif defined(S390) || defined(S390X)
 841         tprintf(fmt, s390_regset.psw.addr);
 842 #elif defined(IA64)
 843         tprintf(fmt, ia64_regs.br[0]);
 844 #elif defined(POWERPC)
 845         tprintf(fmt, ppc_regs.nip);
 846 #elif defined(M68K)
 847         long pc;
 848         if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) {
 849                 PRINTBADPC;
 850                 return;
 851         }
 852         tprintf(fmt, pc);
 853 #elif defined(ALPHA)
 854         long pc;
 855         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 856                 PRINTBADPC;
 857                 return;
 858         }
 859         tprintf(fmt, pc);
 860 #elif defined(SPARC)
 861         tprintf(fmt, sparc_regs.pc);
 862 #elif defined(SPARC64)
 863         tprintf(fmt, sparc_regs.tpc);
 864 #elif defined(HPPA)
 865         long pc;
 866         if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) {
 867                 PRINTBADPC;
 868                 return;
 869         }
 870         tprintf(fmt, pc);
 871 #elif defined MIPS
 872         tprintf(fmt, (unsigned long) mips_REG_EPC);
 873 #elif defined(SH)
 874         long pc;
 875         if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) {
 876                 PRINTBADPC;
 877                 return;
 878         }
 879         tprintf(fmt, pc);
 880 #elif defined(SH64)
 881         long pc;
 882         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 883                 PRINTBADPC;
 884                 return;
 885         }
 886         tprintf(fmt, pc);
 887 #elif defined(AARCH64)
 888         if (aarch64_io.iov_len == sizeof(arm_regs))
 889                 tprintf(fmt, (unsigned long) arm_regs.ARM_pc);
 890         else
 891                 tprintf(fmt, (unsigned long) aarch64_regs.pc);
 892 #elif defined(ARM)
 893         tprintf(fmt, arm_regs.ARM_pc);
 894 #elif defined(AVR32)
 895         tprintf(fmt, avr32_regs.pc);
 896 #elif defined(BFIN)
 897         long pc;
 898         if (upeek(tcp->pid, PT_PC, &pc) < 0) {
 899                 PRINTBADPC;
 900                 return;
 901         }
 902         tprintf(fmt, pc);
 903 #elif defined(CRISV10)
 904         long pc;
 905         if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) {
 906                 PRINTBADPC;
 907                 return;
 908         }
 909         tprintf(fmt, pc);
 910 #elif defined(CRISV32)
 911         long pc;
 912         if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) {
 913                 PRINTBADPC;
 914                 return;
 915         }
 916         tprintf(fmt, pc);
 917 #elif defined(TILE)
 918         tprintf(fmt, (unsigned long) tile_regs.pc);
 919 #elif defined(OR1K)
 920         tprintf(fmt, or1k_regs.pc);
 921 #elif defined(METAG)
 922         tprintf(fmt, metag_regs.pc);
 923 #elif defined(XTENSA)
 924         long pc;
 925         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 926                 PRINTBADPC;
 927                 return;
 928         }
 929         tprintf(fmt, pc);
 930 #elif defined(ARC)
 931         tprintf(fmt, arc_regs.efa);
 932 #else
 933 # warning print_pc is not implemented for this architecture
 934         PRINTBADPC;
 935 #endif /* architecture */
 936 }
 937
 938 /*
 939  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 940  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 941  */
 942 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 943 static long
 944 shuffle_scno(unsigned long scno)
 945 {
 946         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 947                 return scno;
 948
 949         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 950         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 951                 return 0x000ffff0;
 952         if (scno == 0x000ffff0)
 953                 return ARM_FIRST_SHUFFLED_SYSCALL;
 954
 955 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 956         /*
 957          * Is it ARM specific syscall?
 958          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 959          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 960          */
 961         if (scno >= 0x000f0000 &&
 962             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 963                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 964         }
 965         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 966                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 967         }
 968
 969         return scno;
 970 }
 971 #else
 972 # define shuffle_scno(scno) ((long)(scno))
 973 #endif
 974
 975 static char*
 976 undefined_scno_name(struct tcb *tcp)
 977 {
 978         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 979
 980         sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
 981         return buf;
 982 }
 983
 984 #ifdef POWERPC
 985 /*
 986  * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23,
 987  * we provide a slow fallback for old kernels.
 988  */
 989 static int powerpc_getregs_old(pid_t pid)
 990 {
 991         int i;
 992         long r;
 993
 994         if (iflag) {
 995                 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip);
 996                 if (r)
 997                         goto out;
 998         }
 999 #ifdef POWERPC64 /* else we never use it */
1000         r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr);
1001         if (r)
1002                 goto out;
1003 #endif
1004         r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr);
1005         if (r)
1006                 goto out;
1007         r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3);
1008         if (r)
1009                 goto out;
1010         for (i = 0; i <= 8; i++) {
1011                 r = upeek(pid, sizeof(long) * (PT_R0 + i),
1012                           (long *)&ppc_regs.gpr[i]);
1013                 if (r)
1014                         goto out;
1015         }
1016  out:
1017         return r;
1018 }
1019 #endif
1020
1021 void
1022 clear_regs(void)
1023 {
1024         get_regs_error = -1;
1025 }
1026
1027 #if defined ARCH_REGS_FOR_GETREGSET
1028 static long
1029 get_regset(pid_t pid)
1030 {
1031 # ifdef ARCH_IOVEC_FOR_GETREGSET
1032         /* variable iovec */
1033         ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1034         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1035                       &ARCH_IOVEC_FOR_GETREGSET);
1036 # else
1037         /* constant iovec */
1038         static struct iovec io = {
1039                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1040                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1041         };
1042         return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1043
1044 # endif
1045 }
1046 #endif /* ARCH_REGS_FOR_GETREGSET */
1047
1048 void
1049 get_regs(pid_t pid)
1050 {
1051 #ifdef ARCH_REGS_FOR_GETREGSET
1052 # ifdef X86_64
1053         /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */
1054         static int getregset_support;
1055
1056         if (getregset_support >= 0) {
1057                 get_regs_error = get_regset(pid);
1058                 if (getregset_support > 0)
1059                         return;
1060                 if (get_regs_error >= 0) {
1061                         getregset_support = 1;
1062                         return;
1063                 }
1064                 if (errno == EPERM || errno == ESRCH)
1065                         return;
1066                 getregset_support = -1;
1067         }
1068         /* Use old method, with unreliable heuristical detection of 32-bitness. */
1069         x86_io.iov_len = sizeof(x86_64_regs);
1070         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs);
1071         if (!get_regs_error && x86_64_regs.cs == 0x23) {
1072                 x86_io.iov_len = sizeof(i386_regs);
1073                 /*
1074                  * The order is important: i386_regs and x86_64_regs
1075                  * are overlaid in memory!
1076                  */
1077                 i386_regs.ebx = x86_64_regs.rbx;
1078                 i386_regs.ecx = x86_64_regs.rcx;
1079                 i386_regs.edx = x86_64_regs.rdx;
1080                 i386_regs.esi = x86_64_regs.rsi;
1081                 i386_regs.edi = x86_64_regs.rdi;
1082                 i386_regs.ebp = x86_64_regs.rbp;
1083                 i386_regs.eax = x86_64_regs.rax;
1084                 /* i386_regs.xds = x86_64_regs.ds; unused by strace */
1085                 /* i386_regs.xes = x86_64_regs.es; ditto... */
1086                 /* i386_regs.xfs = x86_64_regs.fs; */
1087                 /* i386_regs.xgs = x86_64_regs.gs; */
1088                 i386_regs.orig_eax = x86_64_regs.orig_rax;
1089                 i386_regs.eip = x86_64_regs.rip;
1090                 /* i386_regs.xcs = x86_64_regs.cs; */
1091                 /* i386_regs.eflags = x86_64_regs.eflags; */
1092                 i386_regs.esp = x86_64_regs.rsp;
1093                 /* i386_regs.xss = x86_64_regs.ss; */
1094         }
1095 # else /* !X86_64 */
1096         /* Assume that PTRACE_GETREGSET works. */
1097         get_regs_error = get_regset(pid);
1098 # endif
1099 #elif defined ARCH_REGS_FOR_GETREGS
1100 # if defined SPARC || defined SPARC64
1101         /* SPARC systems have the meaning of data and addr reversed */
1102         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0);
1103 # elif defined POWERPC
1104         static bool old_kernel = 0;
1105         if (old_kernel)
1106                 goto old;
1107         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1108         if (get_regs_error && errno == EIO) {
1109                 old_kernel = 1;
1110  old:
1111                 get_regs_error = powerpc_getregs_old(pid);
1112         }
1113 # else
1114         /* Assume that PTRACE_GETREGS works. */
1115         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1116 # endif
1117
1118 #else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */
1119 #  warning get_regs is not implemented for this architecture yet
1120         get_regs_error = 0;
1121 #endif
1122 }
1123
1124 /* Returns:
1125  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1126  * 1: ok, continue in trace_syscall_entering().
1127  * other: error, trace_syscall_entering() should print error indicator
1128  *    ("????" etc) and bail out.
1129  */
1130 static int
1131 get_scno(struct tcb *tcp)
1132 {
1133         long scno = 0;
1134
1135 #if defined(S390) || defined(S390X)
1136         scno = s390_regset.gprs[2];
1137 #elif defined(POWERPC)
1138         scno = ppc_regs.gpr[0];
1139 # ifdef POWERPC64
1140         unsigned int currpers;
1141
1142         /*
1143          * Check for 64/32 bit mode.
1144          * Embedded implementations covered by Book E extension of PPC use
1145          * bit 0 (CM) of 32-bit Machine state register (MSR).
1146          * Other implementations use bit 0 (SF) of 64-bit MSR.
1147          */
1148         currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1;
1149         update_personality(tcp, currpers);
1150 # endif
1151 #elif defined(AVR32)
1152         scno = avr32_regs.r8;
1153 #elif defined(BFIN)
1154         if (upeek(tcp->pid, PT_ORIG_P0, &scno))
1155                 return -1;
1156 #elif defined(I386)
1157         scno = i386_regs.orig_eax;
1158 #elif defined(X86_64) || defined(X32)
1159 # ifndef __X32_SYSCALL_BIT
1160 #  define __X32_SYSCALL_BIT     0x40000000
1161 # endif
1162         unsigned int currpers;
1163 # if 1
1164         /* GETREGSET of NT_PRSTATUS tells us regset size,
1165          * which unambiguously detects i386.
1166          *
1167          * Linux kernel distinguishes x86-64 and x32 processes
1168          * solely by looking at __X32_SYSCALL_BIT:
1169          * arch/x86/include/asm/compat.h::is_x32_task():
1170          * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
1171          *         return true;
1172          */
1173         if (x86_io.iov_len == sizeof(i386_regs)) {
1174                 scno = i386_regs.orig_eax;
1175                 currpers = 1;
1176         } else {
1177                 scno = x86_64_regs.orig_rax;
1178                 currpers = 0;
1179                 if (scno & __X32_SYSCALL_BIT) {
1180                         /*
1181                          * Syscall number -1 requires special treatment:
1182                          * it might be a side effect of SECCOMP_RET_ERRNO
1183                          * filtering that sets orig_rax to -1
1184                          * in some versions of linux kernel.
1185                          * If that is the case, then
1186                          * __X32_SYSCALL_BIT logic does not apply.
1187                          */
1188                         if ((long long) x86_64_regs.orig_rax != -1) {
1189                                 scno -= __X32_SYSCALL_BIT;
1190                                 currpers = 2;
1191                         } else {
1192 #  ifdef X32
1193                                 currpers = 2;
1194 #  endif
1195                         }
1196                 }
1197         }
1198 # elif 0
1199         /* cs = 0x33 for long mode (native 64 bit and x32)
1200          * cs = 0x23 for compatibility mode (32 bit)
1201          * ds = 0x2b for x32 mode (x86-64 in 32 bit)
1202          */
1203         scno = x86_64_regs.orig_rax;
1204         switch (x86_64_regs.cs) {
1205                 case 0x23: currpers = 1; break;
1206                 case 0x33:
1207                         if (x86_64_regs.ds == 0x2b) {
1208                                 currpers = 2;
1209                                 scno &= ~__X32_SYSCALL_BIT;
1210                         } else
1211                                 currpers = 0;
1212                         break;
1213                 default:
1214                         fprintf(stderr, "Unknown value CS=0x%08X while "
1215                                  "detecting personality of process "
1216                                  "PID=%d\n", (int)x86_64_regs.cs, tcp->pid);
1217                         currpers = current_personality;
1218                         break;
1219         }
1220 # elif 0
1221         /* This version analyzes the opcode of a syscall instruction.
1222          * (int 0x80 on i386 vs. syscall on x86-64)
1223          * It works, but is too complicated, and strictly speaking, unreliable.
1224          */
1225         unsigned long call, rip = x86_64_regs.rip;
1226         /* sizeof(syscall) == sizeof(int 0x80) == 2 */
1227         rip -= 2;
1228         errno = 0;
1229         call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0);
1230         if (errno)
1231                 fprintf(stderr, "ptrace_peektext failed: %s\n",
1232                                 strerror(errno));
1233         switch (call & 0xffff) {
1234                 /* x86-64: syscall = 0x0f 0x05 */
1235                 case 0x050f: currpers = 0; break;
1236                 /* i386: int 0x80 = 0xcd 0x80 */
1237                 case 0x80cd: currpers = 1; break;
1238                 default:
1239                         currpers = current_personality;
1240                         fprintf(stderr,
1241                                 "Unknown syscall opcode (0x%04X) while "
1242                                 "detecting personality of process "
1243                                 "PID=%d\n", (int)call, tcp->pid);
1244                         break;
1245         }
1246 # endif
1247
1248 # ifdef X32
1249         /* If we are built for a x32 system, then personality 0 is x32
1250          * (not x86_64), and stracing of x86_64 apps is not supported.
1251          * Stracing of i386 apps is still supported.
1252          */
1253         if (currpers == 0) {
1254                 fprintf(stderr, "syscall_%lu(...) in unsupported "
1255                                 "64-bit mode of process PID=%d\n",
1256                         scno, tcp->pid);
1257                 return 0;
1258         }
1259         currpers &= ~2; /* map 2,1 to 0,1 */
1260 # endif
1261         update_personality(tcp, currpers);
1262 #elif defined(IA64)
1263         if (ia64_ia32mode) {
1264                 scno = ia64_regs.gr[0];
1265         } else {
1266                 scno = ia64_regs.gr[15];
1267         }
1268 #elif defined(AARCH64)
1269         switch (aarch64_io.iov_len) {
1270                 case sizeof(aarch64_regs):
1271                         /* We are in 64-bit mode */
1272                         scno = aarch64_regs.regs[8];
1273                         update_personality(tcp, 1);
1274                         break;
1275                 case sizeof(arm_regs):
1276                         /* We are in 32-bit mode */
1277                         /* Note: we don't support OABI, unlike 32-bit ARM build */
1278                         scno = arm_regs.ARM_r7;
1279                         scno = shuffle_scno(scno);
1280                         update_personality(tcp, 0);
1281                         break;
1282         }
1283 #elif defined(ARM)
1284         if (arm_regs.ARM_ip != 0) {
1285                 /* It is not a syscall entry */
1286                 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
1287                 tcp->flags |= TCB_INSYSCALL;
1288                 return 0;
1289         }
1290         /* Note: we support only 32-bit CPUs, not 26-bit */
1291
1292 # if !defined(__ARM_EABI__) || ENABLE_ARM_OABI
1293         if (arm_regs.ARM_cpsr & 0x20)
1294                 /* Thumb mode */
1295                 goto scno_in_r7;
1296         /* ARM mode */
1297         /* Check EABI/OABI by examining SVC insn's low 24 bits */
1298         errno = 0;
1299         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL);
1300         if (errno)
1301                 return -1;
1302         /* EABI syscall convention? */
1303         if ((unsigned long) scno != 0xef000000) {
1304                 /* No, it's OABI */
1305                 if ((scno & 0x0ff00000) != 0x0f900000) {
1306                         fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n",
1307                                 tcp->pid, scno);
1308                         return -1;
1309                 }
1310                 /* Fixup the syscall number */
1311                 scno &= 0x000fffff;
1312         } else {
1313  scno_in_r7:
1314                 scno = arm_regs.ARM_r7;
1315         }
1316 # else /* __ARM_EABI__ || !ENABLE_ARM_OABI */
1317         scno = arm_regs.ARM_r7;
1318 # endif
1319         scno = shuffle_scno(scno);
1320 #elif defined(M68K)
1321         if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0)
1322                 return -1;
1323 #elif defined(MIPS)
1324         scno = mips_REG_V0;
1325
1326         if (!SCNO_IN_RANGE(scno)) {
1327                 if (mips_REG_A3 == 0 || mips_REG_A3 == (uint64_t) -1) {
1328                         if (debug_flag)
1329                                 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
1330                         return 0;
1331                 }
1332         }
1333 #elif defined(ALPHA)
1334         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
1335                 return -1;
1336         if (upeek(tcp->pid, REG_R0, &scno) < 0)
1337                 return -1;
1338
1339         /*
1340          * Do some sanity checks to figure out if it's
1341          * really a syscall entry
1342          */
1343         if (!SCNO_IN_RANGE(scno)) {
1344                 if (alpha_a3 == 0 || alpha_a3 == -1) {
1345                         if (debug_flag)
1346                                 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno);
1347                         return 0;
1348                 }
1349         }
1350 #elif defined(SPARC) || defined(SPARC64)
1351         /* Disassemble the syscall trap. */
1352         /* Retrieve the syscall trap instruction. */
1353         unsigned long trap;
1354         errno = 0;
1355 # if defined(SPARC64)
1356         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0);
1357         trap >>= 32;
1358 # else
1359         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0);
1360 # endif
1361         if (errno)
1362                 return -1;
1363
1364         /* Disassemble the trap to see what personality to use. */
1365         switch (trap) {
1366         case 0x91d02010:
1367                 /* Linux/SPARC syscall trap. */
1368                 update_personality(tcp, 0);
1369                 break;
1370         case 0x91d0206d:
1371                 /* Linux/SPARC64 syscall trap. */
1372                 update_personality(tcp, 2);
1373                 break;
1374         case 0x91d02000:
1375                 /* SunOS syscall trap. (pers 1) */
1376                 fprintf(stderr, "syscall: SunOS no support\n");
1377                 return -1;
1378         case 0x91d02008:
1379                 /* Solaris 2.x syscall trap. (per 2) */
1380                 update_personality(tcp, 1);
1381                 break;
1382         case 0x91d02009:
1383                 /* NetBSD/FreeBSD syscall trap. */
1384                 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n");
1385                 return -1;
1386         case 0x91d02027:
1387                 /* Solaris 2.x gettimeofday */
1388                 update_personality(tcp, 1);
1389                 break;
1390         default:
1391 # if defined(SPARC64)
1392                 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc);
1393 # else
1394                 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc);
1395 # endif
1396                 return -1;
1397         }
1398
1399         /* Extract the system call number from the registers. */
1400         if (trap == 0x91d02027)
1401                 scno = 156;
1402         else
1403                 scno = sparc_regs.u_regs[U_REG_G1];
1404         if (scno == 0) {
1405                 scno = sparc_regs.u_regs[U_REG_O0];
1406                 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0]));
1407         }
1408 #elif defined(HPPA)
1409         if (upeek(tcp->pid, PT_GR20, &scno) < 0)
1410                 return -1;
1411 #elif defined(SH)
1412         /*
1413          * In the new syscall ABI, the system call number is in R3.
1414          */
1415         if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0)
1416                 return -1;
1417
1418         if (scno < 0) {
1419                 /* Odd as it may seem, a glibc bug has been known to cause
1420                    glibc to issue bogus negative syscall numbers.  So for
1421                    our purposes, make strace print what it *should* have been */
1422                 long correct_scno = (scno & 0xff);
1423                 if (debug_flag)
1424                         fprintf(stderr,
1425                                 "Detected glibc bug: bogus system call"
1426                                 " number = %ld, correcting to %ld\n",
1427                                 scno,
1428                                 correct_scno);
1429                 scno = correct_scno;
1430         }
1431 #elif defined(SH64)
1432         if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0)
1433                 return -1;
1434         scno &= 0xFFFF;
1435 #elif defined(CRISV10) || defined(CRISV32)
1436         if (upeek(tcp->pid, 4*PT_R9, &scno) < 0)
1437                 return -1;
1438 #elif defined(TILE)
1439         unsigned int currpers;
1440         scno = tile_regs.regs[10];
1441 # ifdef __tilepro__
1442         currpers = 1;
1443 # else
1444 #  ifndef PT_FLAGS_COMPAT
1445 #   define PT_FLAGS_COMPAT 0x10000  /* from Linux 3.8 on */
1446 #  endif
1447         if (tile_regs.flags & PT_FLAGS_COMPAT)
1448                 currpers = 1;
1449         else
1450                 currpers = 0;
1451 # endif
1452         update_personality(tcp, currpers);
1453 #elif defined(MICROBLAZE)
1454         if (upeek(tcp->pid, 0, &scno) < 0)
1455                 return -1;
1456 #elif defined(OR1K)
1457         scno = or1k_regs.gpr[11];
1458 #elif defined(METAG)
1459         scno = metag_regs.dx[0][1];     /* syscall number in D1Re0 (D1.0) */
1460 #elif defined(XTENSA)
1461         if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0)
1462                 return -1;
1463 # elif defined(ARC)
1464         scno = arc_regs.scratch.r8;
1465 #endif
1466
1467         tcp->scno = scno;
1468         if (SCNO_IS_VALID(tcp->scno)) {
1469                 tcp->s_ent = &sysent[scno];
1470                 tcp->qual_flg = qual_flags[scno];
1471         } else {
1472                 static const struct_sysent unknown = {
1473                         .nargs = MAX_ARGS,
1474                         .sys_flags = 0,
1475                         .sys_func = printargs,
1476                         .sys_name = "unknown", /* not used */
1477                 };
1478                 tcp->s_ent = &unknown;
1479                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1480         }
1481         return 1;
1482 }
1483
1484 /*
1485  * Cannot rely on __kernel_[u]long_t being defined,
1486  * it is quite a recent feature of <asm/posix_types.h>.
1487  */
1488 #ifdef __kernel_long_t
1489 typedef __kernel_long_t kernel_long_t;
1490 typedef __kernel_ulong_t kernel_ulong_t;
1491 #else
1492 # ifdef X32
1493 typedef long long kernel_long_t;
1494 typedef unsigned long long kernel_ulong_t;
1495 # else
1496 typedef long kernel_long_t;
1497 typedef unsigned long kernel_ulong_t;
1498 # endif
1499 #endif
1500
1501 /*
1502  * Check the syscall return value register value for whether it is
1503  * a negated errno code indicating an error, or a success return value.
1504  */
1505 static inline bool
1506 is_negated_errno(kernel_ulong_t val)
1507 {
1508         /* Linux kernel defines MAX_ERRNO to 4095. */
1509         kernel_ulong_t max = -(kernel_long_t) 4095;
1510
1511 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
1512         if (current_wordsize < sizeof(val)) {
1513                 val = (uint32_t) val;
1514                 max = (uint32_t) max;
1515         }
1516 #elif defined X32
1517         /*
1518          * current_wordsize is 4 even in personality 0 (native X32)
1519          * but truncation _must not_ be done in it.
1520          * can't check current_wordsize here!
1521          */
1522         if (current_personality != 0) {
1523                 val = (uint32_t) val;
1524                 max = (uint32_t) max;
1525         }
1526 #endif
1527
1528         return val >= max;
1529 }
1530
1531 /* Return -1 on error or 1 on success (never 0!) */
1532 static int
1533 get_syscall_args(struct tcb *tcp)
1534 {
1535         int i, nargs;
1536
1537         nargs = tcp->s_ent->nargs;
1538
1539 #if defined(S390) || defined(S390X)
1540         (void)i;
1541         (void)nargs;
1542         tcp->u_arg[0] = s390_regset.orig_gpr2;
1543         tcp->u_arg[1] = s390_regset.gprs[3];
1544         tcp->u_arg[2] = s390_regset.gprs[4];
1545         tcp->u_arg[3] = s390_regset.gprs[5];
1546         tcp->u_arg[4] = s390_regset.gprs[6];
1547         tcp->u_arg[5] = s390_regset.gprs[7];
1548 #elif defined(ALPHA)
1549         for (i = 0; i < nargs; ++i)
1550                 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1551                         return -1;
1552 #elif defined(IA64)
1553         if (!ia64_ia32mode) {
1554                 unsigned long *rbs_end =
1555                         (unsigned long *) ia64_regs.ar[PT_AUR_BSP];
1556                 unsigned long sof = (ia64_regs.cfm >> 0) & 0x7f;
1557                 unsigned long sol = (ia64_regs.cfm >> 7) & 0x7f;
1558                 unsigned long *out0 = ia64_rse_skip_regs(rbs_end, -sof + sol);
1559
1560                 for (i = 0; i < nargs; ++i) {
1561                         if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1562                                    sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1563                                 return -1;
1564                 }
1565         } else {
1566                 (void)i;
1567                 (void)nargs;
1568                 /* truncate away IVE sign-extension */
1569                 tcp->u_arg[0] = 0xffffffff & ia64_regs.gr[11]; /* EBX */
1570                 tcp->u_arg[1] = 0xffffffff & ia64_regs.gr[ 9]; /* ECX */
1571                 tcp->u_arg[2] = 0xffffffff & ia64_regs.gr[10]; /* EDX */
1572                 tcp->u_arg[3] = 0xffffffff & ia64_regs.gr[14]; /* ESI */
1573                 tcp->u_arg[4] = 0xffffffff & ia64_regs.gr[15]; /* EDI */
1574                 tcp->u_arg[5] = 0xffffffff & ia64_regs.gr[13]; /* EBP */
1575         }
1576 #elif defined LINUX_MIPSN64
1577         (void)i;
1578         (void)nargs;
1579         tcp->u_arg[0] = mips_REG_A0;
1580         tcp->u_arg[1] = mips_REG_A1;
1581         tcp->u_arg[2] = mips_REG_A2;
1582         tcp->u_arg[3] = mips_REG_A3;
1583         tcp->u_arg[4] = mips_REG_A4;
1584         tcp->u_arg[5] = mips_REG_A5;
1585 #elif defined LINUX_MIPSN32
1586         (void)i;
1587         (void)nargs;
1588         tcp->u_arg[0] = tcp->ext_arg[0] = mips_REG_A0;
1589         tcp->u_arg[1] = tcp->ext_arg[1] = mips_REG_A1;
1590         tcp->u_arg[2] = tcp->ext_arg[2] = mips_REG_A2;
1591         tcp->u_arg[3] = tcp->ext_arg[3] = mips_REG_A3;
1592         tcp->u_arg[4] = tcp->ext_arg[4] = mips_REG_A4;
1593         tcp->u_arg[5] = tcp->ext_arg[5] = mips_REG_A5;
1594 #elif defined LINUX_MIPSO32
1595         (void)i;
1596         (void)nargs;
1597         tcp->u_arg[0] = mips_REG_A0;
1598         tcp->u_arg[1] = mips_REG_A1;
1599         tcp->u_arg[2] = mips_REG_A2;
1600         tcp->u_arg[3] = mips_REG_A3;
1601         if (nargs > 4) {
1602                 umoven(tcp, mips_REG_SP + 4 * 4,
1603                        (nargs - 4) * sizeof(tcp->u_arg[0]),
1604                        (char *)(tcp->u_arg + 4));
1605         }
1606 #elif defined(POWERPC)
1607         (void)i;
1608         (void)nargs;
1609         tcp->u_arg[0] = ppc_regs.orig_gpr3;
1610         tcp->u_arg[1] = ppc_regs.gpr[4];
1611         tcp->u_arg[2] = ppc_regs.gpr[5];
1612         tcp->u_arg[3] = ppc_regs.gpr[6];
1613         tcp->u_arg[4] = ppc_regs.gpr[7];
1614         tcp->u_arg[5] = ppc_regs.gpr[8];
1615 #elif defined(SPARC) || defined(SPARC64)
1616         for (i = 0; i < nargs; ++i)
1617                 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i];
1618 #elif defined(HPPA)
1619         for (i = 0; i < nargs; ++i)
1620                 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1621                         return -1;
1622 #elif defined(ARM) || defined(AARCH64)
1623 # if defined(AARCH64)
1624         if (tcp->currpers == 1)
1625                 for (i = 0; i < nargs; ++i)
1626                         tcp->u_arg[i] = aarch64_regs.regs[i];
1627         else
1628 # endif
1629         for (i = 0; i < nargs; ++i)
1630                 tcp->u_arg[i] = arm_regs.uregs[i];
1631 #elif defined(AVR32)
1632         (void)i;
1633         (void)nargs;
1634         tcp->u_arg[0] = avr32_regs.r12;
1635         tcp->u_arg[1] = avr32_regs.r11;
1636         tcp->u_arg[2] = avr32_regs.r10;
1637         tcp->u_arg[3] = avr32_regs.r9;
1638         tcp->u_arg[4] = avr32_regs.r5;
1639         tcp->u_arg[5] = avr32_regs.r3;
1640 #elif defined(BFIN)
1641         static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 };
1642
1643         for (i = 0; i < nargs; ++i)
1644                 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0)
1645                         return -1;
1646 #elif defined(SH)
1647         static const int syscall_regs[MAX_ARGS] = {
1648                 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6),
1649                 4 * (REG_REG0+7), 4 * (REG_REG0  ), 4 * (REG_REG0+1)
1650         };
1651
1652         for (i = 0; i < nargs; ++i)
1653                 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0)
1654                         return -1;
1655 #elif defined(SH64)
1656         int i;
1657         /* Registers used by SH5 Linux system calls for parameters */
1658         static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 };
1659
1660         for (i = 0; i < nargs; ++i)
1661                 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
1662                         return -1;
1663 #elif defined(I386)
1664         (void)i;
1665         (void)nargs;
1666         tcp->u_arg[0] = i386_regs.ebx;
1667         tcp->u_arg[1] = i386_regs.ecx;
1668         tcp->u_arg[2] = i386_regs.edx;
1669         tcp->u_arg[3] = i386_regs.esi;
1670         tcp->u_arg[4] = i386_regs.edi;
1671         tcp->u_arg[5] = i386_regs.ebp;
1672 #elif defined(X86_64) || defined(X32)
1673         (void)i;
1674         (void)nargs;
1675         if (x86_io.iov_len != sizeof(i386_regs)) {
1676                 /* x86-64 or x32 ABI */
1677                 tcp->u_arg[0] = x86_64_regs.rdi;
1678                 tcp->u_arg[1] = x86_64_regs.rsi;
1679                 tcp->u_arg[2] = x86_64_regs.rdx;
1680                 tcp->u_arg[3] = x86_64_regs.r10;
1681                 tcp->u_arg[4] = x86_64_regs.r8;
1682                 tcp->u_arg[5] = x86_64_regs.r9;
1683 #  ifdef X32
1684                 tcp->ext_arg[0] = x86_64_regs.rdi;
1685                 tcp->ext_arg[1] = x86_64_regs.rsi;
1686                 tcp->ext_arg[2] = x86_64_regs.rdx;
1687                 tcp->ext_arg[3] = x86_64_regs.r10;
1688                 tcp->ext_arg[4] = x86_64_regs.r8;
1689                 tcp->ext_arg[5] = x86_64_regs.r9;
1690 #  endif
1691         } else {
1692                 /* i386 ABI */
1693                 /* Zero-extend from 32 bits */
1694                 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers
1695                  * if you need to use *sign-extended* parameter.
1696                  */
1697                 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx;
1698                 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx;
1699                 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx;
1700                 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi;
1701                 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi;
1702                 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp;
1703         }
1704 #elif defined(MICROBLAZE)
1705         for (i = 0; i < nargs; ++i)
1706                 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0)
1707                         return -1;
1708 #elif defined(CRISV10) || defined(CRISV32)
1709         static const int crisregs[MAX_ARGS] = {
1710                 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12,
1711                 4*PT_R13     , 4*PT_MOF, 4*PT_SRP
1712         };
1713
1714         for (i = 0; i < nargs; ++i)
1715                 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0)
1716                         return -1;
1717 #elif defined(TILE)
1718         for (i = 0; i < nargs; ++i)
1719                 tcp->u_arg[i] = tile_regs.regs[i];
1720 #elif defined(M68K)
1721         for (i = 0; i < nargs; ++i)
1722                 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0)
1723                         return -1;
1724 #elif defined(OR1K)
1725         (void)nargs;
1726         for (i = 0; i < 6; ++i)
1727                 tcp->u_arg[i] = or1k_regs.gpr[3 + i];
1728 #elif defined(METAG)
1729         for (i = 0; i < nargs; i++)
1730                 /* arguments go backwards from D1Ar1 (D1.3) */
1731                 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i];
1732 #elif defined(XTENSA)
1733         /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */
1734         static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 };
1735         for (i = 0; i < nargs; ++i)
1736                 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0)
1737                         return -1;
1738 # elif defined(ARC)
1739         long *arc_args = &arc_regs.scratch.r0;
1740         for (i = 0; i < nargs; ++i)
1741                 tcp->u_arg[i] = *arc_args--;
1742
1743 #else /* Other architecture (32bits specific) */
1744         for (i = 0; i < nargs; ++i)
1745                 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0)
1746                         return -1;
1747 #endif
1748         return 1;
1749 }
1750
1751 static int
1752 trace_syscall_entering(struct tcb *tcp)
1753 {
1754         int res, scno_good;
1755
1756         scno_good = res = (get_regs_error ? -1 : get_scno(tcp));
1757         if (res == 0)
1758                 return res;
1759         if (res == 1)
1760                 res = get_syscall_args(tcp);
1761
1762         if (res != 1) {
1763                 printleader(tcp);
1764                 if (scno_good != 1)
1765                         tprints("????" /* anti-trigraph gap */ "(");
1766                 else if (tcp->qual_flg & UNDEFINED_SCNO)
1767                         tprintf("%s(", undefined_scno_name(tcp));
1768                 else
1769                         tprintf("%s(", tcp->s_ent->sys_name);
1770                 /*
1771                  * " <unavailable>" will be added later by the code which
1772                  * detects ptrace errors.
1773                  */
1774                 goto ret;
1775         }
1776
1777         if (   sys_execve == tcp->s_ent->sys_func
1778 # if defined(SPARC) || defined(SPARC64)
1779             || sys_execv == tcp->s_ent->sys_func
1780 # endif
1781            ) {
1782                 hide_log_until_execve = 0;
1783         }
1784
1785 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
1786         while (1) {
1787 # ifdef SYS_socket_subcall
1788                 if (tcp->s_ent->sys_func == sys_socketcall) {
1789                         decode_socket_subcall(tcp);
1790                         break;
1791                 }
1792 # endif
1793 # ifdef SYS_ipc_subcall
1794                 if (tcp->s_ent->sys_func == sys_ipc) {
1795                         decode_ipc_subcall(tcp);
1796                         break;
1797                 }
1798 # endif
1799                 break;
1800         }
1801 #endif
1802
1803         if (!(tcp->qual_flg & QUAL_TRACE)
1804          || (tracing_paths && !pathtrace_match(tcp))
1805         ) {
1806                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
1807                 return 0;
1808         }
1809
1810         tcp->flags &= ~TCB_FILTERED;
1811
1812         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
1813                 res = 0;
1814                 goto ret;
1815         }
1816
1817 #ifdef USE_LIBUNWIND
1818         if (stack_trace_enabled) {
1819                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
1820                         unwind_capture_stacktrace(tcp);
1821         }
1822 #endif
1823
1824         printleader(tcp);
1825         if (tcp->qual_flg & UNDEFINED_SCNO)
1826                 tprintf("%s(", undefined_scno_name(tcp));
1827         else
1828                 tprintf("%s(", tcp->s_ent->sys_name);
1829         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
1830                 res = printargs(tcp);
1831         else
1832                 res = tcp->s_ent->sys_func(tcp);
1833
1834         fflush(tcp->outf);
1835  ret:
1836         tcp->flags |= TCB_INSYSCALL;
1837         /* Measure the entrance time as late as possible to avoid errors. */
1838         if (Tflag || cflag)
1839                 gettimeofday(&tcp->etime, NULL);
1840         return res;
1841 }
1842
1843 /* Returns:
1844  * 1: ok, continue in trace_syscall_exiting().
1845  * -1: error, trace_syscall_exiting() should print error indicator
1846  *    ("????" etc) and bail out.
1847  */
1848 static int
1849 get_syscall_result(struct tcb *tcp)
1850 {
1851 #if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS
1852         /* already done by get_regs */
1853 #elif defined(BFIN)
1854         if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0)
1855                 return -1;
1856 #elif defined(M68K)
1857         if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0)
1858                 return -1;
1859 #elif defined(ALPHA)
1860         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
1861                 return -1;
1862         if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0)
1863                 return -1;
1864 #elif defined(HPPA)
1865         if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0)
1866                 return -1;
1867 #elif defined(SH)
1868         /* new syscall ABI returns result in R0 */
1869         if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0)
1870                 return -1;
1871 #elif defined(SH64)
1872         /* ABI defines result returned in r9 */
1873         if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0)
1874                 return -1;
1875 #elif defined(CRISV10) || defined(CRISV32)
1876         if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0)
1877                 return -1;
1878 #elif defined(MICROBLAZE)
1879         if (upeek(tcp->pid, 3 * 4, &microblaze_r3) < 0)
1880                 return -1;
1881 #elif defined(XTENSA)
1882         if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0)
1883                 return -1;
1884 #else
1885 # error get_syscall_result is not implemented for this architecture
1886 #endif
1887         return 1;
1888 }
1889
1890 /* Returns:
1891  * 1: ok, continue in trace_syscall_exiting().
1892  * -1: error, trace_syscall_exiting() should print error indicator
1893  *    ("????" etc) and bail out.
1894  */
1895 static void
1896 get_error(struct tcb *tcp)
1897 {
1898         int u_error = 0;
1899         int check_errno = 1;
1900         if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) {
1901                 check_errno = 0;
1902         }
1903 #if defined(S390) || defined(S390X)
1904         if (check_errno && is_negated_errno(s390_regset.gprs[2])) {
1905                 tcp->u_rval = -1;
1906                 u_error = -s390_regset.gprs[2];
1907         }
1908         else {
1909                 tcp->u_rval = s390_regset.gprs[2];
1910         }
1911 #elif defined(I386)
1912         if (check_errno && is_negated_errno(i386_regs.eax)) {
1913                 tcp->u_rval = -1;
1914                 u_error = -i386_regs.eax;
1915         }
1916         else {
1917                 tcp->u_rval = i386_regs.eax;
1918         }
1919 #elif defined(X86_64) || defined(X32)
1920         /*
1921          * In X32, return value is 64-bit (llseek uses one).
1922          * Using merely "long rax" would not work.
1923          */
1924         kernel_long_t rax;
1925
1926         if (x86_io.iov_len == sizeof(i386_regs)) {
1927                 /* Sign extend from 32 bits */
1928                 rax = (int32_t) i386_regs.eax;
1929         } else {
1930                 rax = x86_64_regs.rax;
1931         }
1932         if (check_errno && is_negated_errno(rax)) {
1933                 tcp->u_rval = -1;
1934                 u_error = -rax;
1935         }
1936         else {
1937                 tcp->u_rval = rax;
1938 # ifdef X32
1939                 /* tcp->u_rval contains a truncated value */
1940                 tcp->u_lrval = rax;
1941 # endif
1942         }
1943 #elif defined(IA64)
1944         if (ia64_ia32mode) {
1945                 int err = ia64_regs.gr[8];
1946                 if (check_errno && is_negated_errno(err)) {
1947                         tcp->u_rval = -1;
1948                         u_error = -err;
1949                 }
1950                 else {
1951                         tcp->u_rval = err;
1952                 }
1953         } else {
1954                 if (check_errno && ia64_regs.gr[10]) {
1955                         tcp->u_rval = -1;
1956                         u_error = ia64_regs.gr[8];
1957                 } else {
1958                         tcp->u_rval = ia64_regs.gr[8];
1959                 }
1960         }
1961 #elif defined(MIPS)
1962         if (check_errno && mips_REG_A3) {
1963                 tcp->u_rval = -1;
1964                 u_error = mips_REG_V0;
1965         } else {
1966 # if defined LINUX_MIPSN32
1967                 tcp->u_lrval = mips_REG_V0;
1968 # endif
1969                 tcp->u_rval = mips_REG_V0;
1970         }
1971 #elif defined(POWERPC)
1972         if (check_errno && (ppc_regs.ccr & 0x10000000)) {
1973                 tcp->u_rval = -1;
1974                 u_error = ppc_regs.gpr[3];
1975         }
1976         else {
1977                 tcp->u_rval = ppc_regs.gpr[3];
1978         }
1979 #elif defined(M68K)
1980         if (check_errno && is_negated_errno(m68k_d0)) {
1981                 tcp->u_rval = -1;
1982                 u_error = -m68k_d0;
1983         }
1984         else {
1985                 tcp->u_rval = m68k_d0;
1986         }
1987 #elif defined(ARM) || defined(AARCH64)
1988 # if defined(AARCH64)
1989         if (tcp->currpers == 1) {
1990                 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) {
1991                         tcp->u_rval = -1;
1992                         u_error = -aarch64_regs.regs[0];
1993                 }
1994                 else {
1995                         tcp->u_rval = aarch64_regs.regs[0];
1996                 }
1997         }
1998         else
1999 # endif
2000         {
2001                 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) {
2002                         tcp->u_rval = -1;
2003                         u_error = -arm_regs.ARM_r0;
2004                 }
2005                 else {
2006                         tcp->u_rval = arm_regs.ARM_r0;
2007                 }
2008         }
2009 #elif defined(AVR32)
2010         if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) {
2011                 tcp->u_rval = -1;
2012                 u_error = -avr32_regs.r12;
2013         }
2014         else {
2015                 tcp->u_rval = avr32_regs.r12;
2016         }
2017 #elif defined(BFIN)
2018         if (check_errno && is_negated_errno(bfin_r0)) {
2019                 tcp->u_rval = -1;
2020                 u_error = -bfin_r0;
2021         } else {
2022                 tcp->u_rval = bfin_r0;
2023         }
2024 #elif defined(ALPHA)
2025         if (check_errno && alpha_a3) {
2026                 tcp->u_rval = -1;
2027                 u_error = alpha_r0;
2028         }
2029         else {
2030                 tcp->u_rval = alpha_r0;
2031         }
2032 #elif defined(SPARC)
2033         if (check_errno && sparc_regs.psr & PSR_C) {
2034                 tcp->u_rval = -1;
2035                 u_error = sparc_regs.u_regs[U_REG_O0];
2036         }
2037         else {
2038                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2039         }
2040 #elif defined(SPARC64)
2041         if (check_errno && sparc_regs.tstate & 0x1100000000UL) {
2042                 tcp->u_rval = -1;
2043                 u_error = sparc_regs.u_regs[U_REG_O0];
2044         }
2045         else {
2046                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2047         }
2048 #elif defined(HPPA)
2049         if (check_errno && is_negated_errno(hppa_r28)) {
2050                 tcp->u_rval = -1;
2051                 u_error = -hppa_r28;
2052         }
2053         else {
2054                 tcp->u_rval = hppa_r28;
2055         }
2056 #elif defined(SH)
2057         if (check_errno && is_negated_errno(sh_r0)) {
2058                 tcp->u_rval = -1;
2059                 u_error = -sh_r0;
2060         }
2061         else {
2062                 tcp->u_rval = sh_r0;
2063         }
2064 #elif defined(SH64)
2065         if (check_errno && is_negated_errno(sh64_r9)) {
2066                 tcp->u_rval = -1;
2067                 u_error = -sh64_r9;
2068         }
2069         else {
2070                 tcp->u_rval = sh64_r9;
2071         }
2072 #elif defined(METAG)
2073         /* result pointer in D0Re0 (D0.0) */
2074         if (check_errno && is_negated_errno(metag_regs.dx[0][0])) {
2075                 tcp->u_rval = -1;
2076                 u_error = -metag_regs.dx[0][0];
2077         }
2078         else {
2079                 tcp->u_rval = metag_regs.dx[0][0];
2080         }
2081 #elif defined(CRISV10) || defined(CRISV32)
2082         if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) {
2083                 tcp->u_rval = -1;
2084                 u_error = -cris_r10;
2085         }
2086         else {
2087                 tcp->u_rval = cris_r10;
2088         }
2089 #elif defined(TILE)
2090         /*
2091          * The standard tile calling convention returns the value (or negative
2092          * errno) in r0, and zero (or positive errno) in r1.
2093          * Until at least kernel 3.8, however, the r1 value is not reflected
2094          * in ptregs at this point, so we use r0 here.
2095          */
2096         if (check_errno && is_negated_errno(tile_regs.regs[0])) {
2097                 tcp->u_rval = -1;
2098                 u_error = -tile_regs.regs[0];
2099         } else {
2100                 tcp->u_rval = tile_regs.regs[0];
2101         }
2102 #elif defined(MICROBLAZE)
2103         if (check_errno && is_negated_errno(microblaze_r3)) {
2104                 tcp->u_rval = -1;
2105                 u_error = -microblaze_r3;
2106         }
2107         else {
2108                 tcp->u_rval = microblaze_r3;
2109         }
2110 #elif defined(OR1K)
2111         if (check_errno && is_negated_errno(or1k_regs.gpr[11])) {
2112                 tcp->u_rval = -1;
2113                 u_error = -or1k_regs.gpr[11];
2114         }
2115         else {
2116                 tcp->u_rval = or1k_regs.gpr[11];
2117         }
2118 #elif defined(XTENSA)
2119         if (check_errno && is_negated_errno(xtensa_a2)) {
2120                 tcp->u_rval = -1;
2121                 u_error = -xtensa_a2;
2122         }
2123         else {
2124                 tcp->u_rval = xtensa_a2;
2125         }
2126 #elif defined(ARC)
2127         if (check_errno && is_negated_errno(arc_regs.scratch.r0)) {
2128                 tcp->u_rval = -1;
2129                 u_error = -arc_regs.scratch.r0;
2130         }
2131         else {
2132                 tcp->u_rval = arc_regs.scratch.r0;
2133         }
2134 #endif
2135         tcp->u_error = u_error;
2136 }
2137
2138 static void
2139 dumpio(struct tcb *tcp)
2140 {
2141         int (*func)();
2142
2143         if (syserror(tcp))
2144                 return;
2145         if ((unsigned long) tcp->u_arg[0] >= num_quals)
2146                 return;
2147         func = tcp->s_ent->sys_func;
2148         if (func == printargs)
2149                 return;
2150         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
2151                 if (func == sys_read ||
2152                     func == sys_pread ||
2153                     func == sys_recv ||
2154                     func == sys_recvfrom) {
2155                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
2156                         return;
2157                 } else if (func == sys_readv) {
2158                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2159                         return;
2160 #if HAVE_SENDMSG
2161                 } else if (func == sys_recvmsg) {
2162                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2163                         return;
2164                 } else if (func == sys_recvmmsg) {
2165                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2166                         return;
2167 #endif
2168                 }
2169         }
2170         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
2171                 if (func == sys_write ||
2172                     func == sys_pwrite ||
2173                     func == sys_send ||
2174                     func == sys_sendto)
2175                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
2176                 else if (func == sys_writev)
2177                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2178 #if HAVE_SENDMSG
2179                 else if (func == sys_sendmsg)
2180                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2181                 else if (func == sys_sendmmsg)
2182                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2183 #endif
2184         }
2185 }
2186
2187 static int
2188 trace_syscall_exiting(struct tcb *tcp)
2189 {
2190         int sys_res;
2191         struct timeval tv;
2192         int res;
2193         long u_error;
2194
2195         /* Measure the exit time as early as possible to avoid errors. */
2196         if (Tflag || cflag)
2197                 gettimeofday(&tv, NULL);
2198
2199 #ifdef USE_LIBUNWIND
2200         if (stack_trace_enabled) {
2201                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
2202                         unwind_cache_invalidate(tcp);
2203         }
2204 #endif
2205
2206 #if SUPPORTED_PERSONALITIES > 1
2207         update_personality(tcp, tcp->currpers);
2208 #endif
2209         res = (get_regs_error ? -1 : get_syscall_result(tcp));
2210         if (res == 1) {
2211                 get_error(tcp); /* never fails */
2212                 if (filtered(tcp) || hide_log_until_execve)
2213                         goto ret;
2214         }
2215
2216         if (cflag) {
2217                 count_syscall(tcp, &tv);
2218                 if (cflag == CFLAG_ONLY_STATS) {
2219                         goto ret;
2220                 }
2221         }
2222
2223         /* If not in -ff mode, and printing_tcp != tcp,
2224          * then the log currently does not end with output
2225          * of _our syscall entry_, but with something else.
2226          * We need to say which syscall's return is this.
2227          *
2228          * Forced reprinting via TCB_REPRINT is used only by
2229          * "strace -ff -oLOG test/threaded_execve" corner case.
2230          * It's the only case when -ff mode needs reprinting.
2231          */
2232         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
2233                 tcp->flags &= ~TCB_REPRINT;
2234                 printleader(tcp);
2235                 if (tcp->qual_flg & UNDEFINED_SCNO)
2236                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
2237                 else
2238                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
2239         }
2240         printing_tcp = tcp;
2241
2242         if (res != 1) {
2243                 /* There was error in one of prior ptrace ops */
2244                 tprints(") ");
2245                 tabto();
2246                 tprints("= ? <unavailable>\n");
2247                 line_ended();
2248                 tcp->flags &= ~TCB_INSYSCALL;
2249                 return res;
2250         }
2251
2252         sys_res = 0;
2253         if (tcp->qual_flg & QUAL_RAW) {
2254                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
2255         } else {
2256         /* FIXME: not_failing_only (IOW, option -z) is broken:
2257          * failure of syscall is known only after syscall return.
2258          * Thus we end up with something like this on, say, ENOENT:
2259          *     open("doesnt_exist", O_RDONLY <unfinished ...>
2260          *     {next syscall decode}
2261          * whereas the intended result is that open(...) line
2262          * is not shown at all.
2263          */
2264                 if (not_failing_only && tcp->u_error)
2265                         goto ret;       /* ignore failed syscalls */
2266                 sys_res = tcp->s_ent->sys_func(tcp);
2267         }
2268
2269         tprints(") ");
2270         tabto();
2271         u_error = tcp->u_error;
2272         if (tcp->qual_flg & QUAL_RAW) {
2273                 if (u_error)
2274                         tprintf("= -1 (errno %ld)", u_error);
2275                 else
2276                         tprintf("= %#lx", tcp->u_rval);
2277         }
2278         else if (!(sys_res & RVAL_NONE) && u_error) {
2279                 switch (u_error) {
2280                 /* Blocked signals do not interrupt any syscalls.
2281                  * In this case syscalls don't return ERESTARTfoo codes.
2282                  *
2283                  * Deadly signals set to SIG_DFL interrupt syscalls
2284                  * and kill the process regardless of which of the codes below
2285                  * is returned by the interrupted syscall.
2286                  * In some cases, kernel forces a kernel-generated deadly
2287                  * signal to be unblocked and set to SIG_DFL (and thus cause
2288                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
2289                  * or SIGILL. (The alternative is to leave process spinning
2290                  * forever on the faulty instruction - not useful).
2291                  *
2292                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
2293                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
2294                  * but kernel will always restart them.
2295                  */
2296                 case ERESTARTSYS:
2297                         /* Most common type of signal-interrupted syscall exit code.
2298                          * The system call will be restarted with the same arguments
2299                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
2300                          */
2301                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
2302                         break;
2303                 case ERESTARTNOINTR:
2304                         /* Rare. For example, fork() returns this if interrupted.
2305                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
2306                          */
2307                         tprints("= ? ERESTARTNOINTR (To be restarted)");
2308                         break;
2309                 case ERESTARTNOHAND:
2310                         /* pause(), rt_sigsuspend() etc use this code.
2311                          * SA_RESTART is ignored (assumed not set):
2312                          * syscall won't restart (will return EINTR instead)
2313                          * even after signal with SA_RESTART set. However,
2314                          * after SIG_IGN or SIG_DFL signal it will restart
2315                          * (thus the name "restart only if has no handler").
2316                          */
2317                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
2318                         break;
2319                 case ERESTART_RESTARTBLOCK:
2320                         /* Syscalls like nanosleep(), poll() which can't be
2321                          * restarted with their original arguments use this
2322                          * code. Kernel will execute restart_syscall() instead,
2323                          * which changes arguments before restarting syscall.
2324                          * SA_RESTART is ignored (assumed not set) similarly
2325                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
2326                          * since restart data is saved in "restart block"
2327                          * in task struct, and if signal handler uses a syscall
2328                          * which in turn saves another such restart block,
2329                          * old data is lost and restart becomes impossible)
2330                          */
2331                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
2332                         break;
2333                 default:
2334                         if ((unsigned long) u_error < nerrnos
2335                             && errnoent[u_error])
2336                                 tprintf("= -1 %s (%s)", errnoent[u_error],
2337                                         strerror(u_error));
2338                         else
2339                                 tprintf("= -1 ERRNO_%lu (%s)", u_error,
2340                                         strerror(u_error));
2341                         break;
2342                 }
2343                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2344                         tprintf(" (%s)", tcp->auxstr);
2345         }
2346         else {
2347                 if (sys_res & RVAL_NONE)
2348                         tprints("= ?");
2349                 else {
2350                         switch (sys_res & RVAL_MASK) {
2351                         case RVAL_HEX:
2352 #if SUPPORTED_PERSONALITIES > 1
2353                                 if (current_wordsize < sizeof(long))
2354                                         tprintf("= %#x",
2355                                                 (unsigned int) tcp->u_rval);
2356                                 else
2357 #endif
2358                                         tprintf("= %#lx", tcp->u_rval);
2359                                 break;
2360                         case RVAL_OCTAL:
2361                                 tprintf("= %#lo", tcp->u_rval);
2362                                 break;
2363                         case RVAL_UDECIMAL:
2364                                 tprintf("= %lu", tcp->u_rval);
2365                                 break;
2366                         case RVAL_DECIMAL:
2367                                 tprintf("= %ld", tcp->u_rval);
2368                                 break;
2369                         case RVAL_FD:
2370                                 if (show_fd_path) {
2371                                         tprints("= ");
2372                                         printfd(tcp, tcp->u_rval);
2373                                 }
2374                                 else
2375                                         tprintf("= %ld", tcp->u_rval);
2376                                 break;
2377 #if defined(LINUX_MIPSN32) || defined(X32)
2378                         /*
2379                         case RVAL_LHEX:
2380                                 tprintf("= %#llx", tcp->u_lrval);
2381                                 break;
2382                         case RVAL_LOCTAL:
2383                                 tprintf("= %#llo", tcp->u_lrval);
2384                                 break;
2385                         */
2386                         case RVAL_LUDECIMAL:
2387                                 tprintf("= %llu", tcp->u_lrval);
2388                                 break;
2389                         /*
2390                         case RVAL_LDECIMAL:
2391                                 tprintf("= %lld", tcp->u_lrval);
2392                                 break;
2393                         */
2394 #endif
2395                         default:
2396                                 fprintf(stderr,
2397                                         "invalid rval format\n");
2398                                 break;
2399                         }
2400                 }
2401                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2402                         tprintf(" (%s)", tcp->auxstr);
2403         }
2404         if (Tflag) {
2405                 tv_sub(&tv, &tv, &tcp->etime);
2406                 tprintf(" <%ld.%06ld>",
2407                         (long) tv.tv_sec, (long) tv.tv_usec);
2408         }
2409         tprints("\n");
2410         dumpio(tcp);
2411         line_ended();
2412
2413 #ifdef USE_LIBUNWIND
2414         if (stack_trace_enabled)
2415                 unwind_print_stacktrace(tcp);
2416 #endif
2417
2418  ret:
2419         tcp->flags &= ~TCB_INSYSCALL;
2420         return 0;
2421 }
2422
2423 int
2424 trace_syscall(struct tcb *tcp)
2425 {
2426         return exiting(tcp) ?
2427                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
2428 }