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/user.h>
  36 #include <sys/param.h>
  37
  38 #ifdef HAVE_SYS_REG_H
  39 # include <sys/reg.h>
  40 #endif
  41
  42 #ifdef HAVE_LINUX_PTRACE_H
  43 # undef PTRACE_SYSCALL
  44 # ifdef HAVE_STRUCT_IA64_FPREG
  45 #  define ia64_fpreg XXX_ia64_fpreg
  46 # endif
  47 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
  48 #  define pt_all_user_regs XXX_pt_all_user_regs
  49 # endif
  50 # ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS
  51 #  define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args
  52 # endif
  53 # include <linux/ptrace.h>
  54 # undef ptrace_peeksiginfo_args
  55 # undef ia64_fpreg
  56 # undef pt_all_user_regs
  57 #endif
  58
  59 #if defined(SPARC64)
  60 # undef PTRACE_GETREGS
  61 # define PTRACE_GETREGS PTRACE_GETREGS64
  62 # undef PTRACE_SETREGS
  63 # define PTRACE_SETREGS PTRACE_SETREGS64
  64 #endif
  65
  66 #if defined(IA64)
  67 # include <asm/ptrace_offsets.h>
  68 # include <asm/rse.h>
  69 #endif
  70
  71 /* for struct iovec */
  72 #include <sys/uio.h>
  73 /* for NT_PRSTATUS */
  74 #ifdef HAVE_ELF_H
  75 # include <elf.h>
  76 #endif
  77
  78 #if defined(AARCH64)
  79 # include <asm/ptrace.h>
  80 #endif
  81
  82 #if defined(XTENSA)
  83 # include <asm/ptrace.h>
  84 #endif
  85
  86 #ifndef NSIG
  87 # warning: NSIG is not defined, using 32
  88 # define NSIG 32
  89 #endif
  90
  91 #include "syscall.h"
  92
  93 /* Define these shorthand notations to simplify the syscallent files. */
  94 #define TD TRACE_DESC
  95 #define TF TRACE_FILE
  96 #define TI TRACE_IPC
  97 #define TN TRACE_NETWORK
  98 #define TP TRACE_PROCESS
  99 #define TS TRACE_SIGNAL
 100 #define TM TRACE_MEMORY
 101 #define NF SYSCALL_NEVER_FAILS
 102 #define MA MAX_ARGS
 103 #define SI STACKTRACE_INVALIDATE_CACHE
 104 #define SE STACKTRACE_CAPTURE_ON_ENTER
 105
 106 const struct_sysent sysent0[] = {
 107 #include "syscallent.h"
 108 };
 109
 110 #if SUPPORTED_PERSONALITIES > 1
 111 static const struct_sysent sysent1[] = {
 112 # include "syscallent1.h"
 113 };
 114 #endif
 115
 116 #if SUPPORTED_PERSONALITIES > 2
 117 static const struct_sysent sysent2[] = {
 118 # include "syscallent2.h"
 119 };
 120 #endif
 121
 122 /* Now undef them since short defines cause wicked namespace pollution. */
 123 #undef TD
 124 #undef TF
 125 #undef TI
 126 #undef TN
 127 #undef TP
 128 #undef TS
 129 #undef TM
 130 #undef NF
 131 #undef MA
 132 #undef SI
 133 #undef SE
 134
 135 /*
 136  * `ioctlent[012].h' files are automatically generated by the auxiliary
 137  * program `ioctlsort', such that the list is sorted by the `code' field.
 138  * This has the side-effect of resolving the _IO.. macros into
 139  * plain integers, eliminating the need to include here everything
 140  * in "/usr/include".
 141  */
 142
 143 const char *const errnoent0[] = {
 144 #include "errnoent.h"
 145 };
 146 const char *const signalent0[] = {
 147 #include "signalent.h"
 148 };
 149 const struct_ioctlent ioctlent0[] = {
 150 #include "ioctlent0.h"
 151 };
 152
 153 #if SUPPORTED_PERSONALITIES > 1
 154 static const char *const errnoent1[] = {
 155 # include "errnoent1.h"
 156 };
 157 static const char *const signalent1[] = {
 158 # include "signalent1.h"
 159 };
 160 static const struct_ioctlent ioctlent1[] = {
 161 # include "ioctlent1.h"
 162 };
 163 #endif
 164
 165 #if SUPPORTED_PERSONALITIES > 2
 166 static const char *const errnoent2[] = {
 167 # include "errnoent2.h"
 168 };
 169 static const char *const signalent2[] = {
 170 # include "signalent2.h"
 171 };
 172 static const struct_ioctlent ioctlent2[] = {
 173 # include "ioctlent2.h"
 174 };
 175 #endif
 176
 177 enum {
 178         nsyscalls0 = ARRAY_SIZE(sysent0)
 179 #if SUPPORTED_PERSONALITIES > 1
 180         , nsyscalls1 = ARRAY_SIZE(sysent1)
 181 # if SUPPORTED_PERSONALITIES > 2
 182         , nsyscalls2 = ARRAY_SIZE(sysent2)
 183 # endif
 184 #endif
 185 };
 186
 187 enum {
 188         nerrnos0 = ARRAY_SIZE(errnoent0)
 189 #if SUPPORTED_PERSONALITIES > 1
 190         , nerrnos1 = ARRAY_SIZE(errnoent1)
 191 # if SUPPORTED_PERSONALITIES > 2
 192         , nerrnos2 = ARRAY_SIZE(errnoent2)
 193 # endif
 194 #endif
 195 };
 196
 197 enum {
 198         nsignals0 = ARRAY_SIZE(signalent0)
 199 #if SUPPORTED_PERSONALITIES > 1
 200         , nsignals1 = ARRAY_SIZE(signalent1)
 201 # if SUPPORTED_PERSONALITIES > 2
 202         , nsignals2 = ARRAY_SIZE(signalent2)
 203 # endif
 204 #endif
 205 };
 206
 207 enum {
 208         nioctlents0 = ARRAY_SIZE(ioctlent0)
 209 #if SUPPORTED_PERSONALITIES > 1
 210         , nioctlents1 = ARRAY_SIZE(ioctlent1)
 211 # if SUPPORTED_PERSONALITIES > 2
 212         , nioctlents2 = ARRAY_SIZE(ioctlent2)
 213 # endif
 214 #endif
 215 };
 216
 217 #if SUPPORTED_PERSONALITIES > 1
 218 const struct_sysent *sysent = sysent0;
 219 const char *const *errnoent = errnoent0;
 220 const char *const *signalent = signalent0;
 221 const struct_ioctlent *ioctlent = ioctlent0;
 222 #endif
 223 unsigned nsyscalls = nsyscalls0;
 224 unsigned nerrnos = nerrnos0;
 225 unsigned nsignals = nsignals0;
 226 unsigned nioctlents = nioctlents0;
 227
 228 unsigned num_quals;
 229 qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
 230
 231 static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
 232         nsyscalls0,
 233 #if SUPPORTED_PERSONALITIES > 1
 234         nsyscalls1,
 235 #endif
 236 #if SUPPORTED_PERSONALITIES > 2
 237         nsyscalls2,
 238 #endif
 239 };
 240 static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
 241         sysent0,
 242 #if SUPPORTED_PERSONALITIES > 1
 243         sysent1,
 244 #endif
 245 #if SUPPORTED_PERSONALITIES > 2
 246         sysent2,
 247 #endif
 248 };
 249
 250 enum {
 251         MAX_NSYSCALLS1 = (nsyscalls0
 252 #if SUPPORTED_PERSONALITIES > 1
 253                         > nsyscalls1 ? nsyscalls0 : nsyscalls1
 254 #endif
 255                         ),
 256         MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
 257 #if SUPPORTED_PERSONALITIES > 2
 258                         > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
 259 #endif
 260                         ),
 261         MAX_NSYSCALLS = MAX_NSYSCALLS2,
 262         /* We are ready for arches with up to 255 signals,
 263          * even though the largest known signo is on MIPS and it is 128.
 264          * The number of existing syscalls on all arches is
 265          * larger that 255 anyway, so it is just a pedantic matter.
 266          */
 267         MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
 268 };
 269
 270 #if SUPPORTED_PERSONALITIES > 1
 271 unsigned current_personality;
 272
 273 # ifndef current_wordsize
 274 unsigned current_wordsize;
 275 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
 276         PERSONALITY0_WORDSIZE,
 277         PERSONALITY1_WORDSIZE,
 278 # if SUPPORTED_PERSONALITIES > 2
 279         PERSONALITY2_WORDSIZE,
 280 # endif
 281 };
 282 # endif
 283
 284 void
 285 set_personality(int personality)
 286 {
 287         nsyscalls = nsyscall_vec[personality];
 288         sysent = sysent_vec[personality];
 289
 290         switch (personality) {
 291         case 0:
 292                 errnoent = errnoent0;
 293                 nerrnos = nerrnos0;
 294                 ioctlent = ioctlent0;
 295                 nioctlents = nioctlents0;
 296                 signalent = signalent0;
 297                 nsignals = nsignals0;
 298                 break;
 299
 300         case 1:
 301                 errnoent = errnoent1;
 302                 nerrnos = nerrnos1;
 303                 ioctlent = ioctlent1;
 304                 nioctlents = nioctlents1;
 305                 signalent = signalent1;
 306                 nsignals = nsignals1;
 307                 break;
 308
 309 # if SUPPORTED_PERSONALITIES > 2
 310         case 2:
 311                 errnoent = errnoent2;
 312                 nerrnos = nerrnos2;
 313                 ioctlent = ioctlent2;
 314                 nioctlents = nioctlents2;
 315                 signalent = signalent2;
 316                 nsignals = nsignals2;
 317                 break;
 318 # endif
 319         }
 320
 321         current_personality = personality;
 322 # ifndef current_wordsize
 323         current_wordsize = personality_wordsize[personality];
 324 # endif
 325 }
 326
 327 static void
 328 update_personality(struct tcb *tcp, unsigned int personality)
 329 {
 330         if (personality == current_personality)
 331                 return;
 332         set_personality(personality);
 333
 334         if (personality == tcp->currpers)
 335                 return;
 336         tcp->currpers = personality;
 337
 338 # if defined(POWERPC64)
 339         if (!qflag) {
 340                 static const char *const names[] = {"64 bit", "32 bit"};
 341                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 342                         tcp->pid, names[personality]);
 343         }
 344 # elif defined(X86_64)
 345         if (!qflag) {
 346                 static const char *const names[] = {"64 bit", "32 bit", "x32"};
 347                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 348                         tcp->pid, names[personality]);
 349         }
 350 # elif defined(X32)
 351         if (!qflag) {
 352                 static const char *const names[] = {"x32", "32 bit"};
 353                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 354                         tcp->pid, names[personality]);
 355         }
 356 # elif defined(AARCH64)
 357         if (!qflag) {
 358                 static const char *const names[] = {"32-bit", "AArch64"};
 359                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 360                         tcp->pid, names[personality]);
 361         }
 362 # elif defined(TILE)
 363         if (!qflag) {
 364                 static const char *const names[] = {"64-bit", "32-bit"};
 365                 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
 366                         tcp->pid, names[personality]);
 367         }
 368 # endif
 369 }
 370 #endif
 371
 372 static int qual_syscall(), qual_signal(), qual_desc();
 373
 374 static const struct qual_options {
 375         unsigned int bitflag;
 376         const char *option_name;
 377         int (*qualify)(const char *, int, int);
 378         const char *argument_name;
 379 } qual_options[] = {
 380         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 381         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 382         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 383         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 384         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 385         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 386         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 387         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 388         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 389         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 390         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 391         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 392         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 393         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 394         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 395         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 396         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 397         { 0,            NULL,           NULL,           NULL            },
 398 };
 399
 400 static void
 401 reallocate_qual(const unsigned int n)
 402 {
 403         unsigned p;
 404         qualbits_t *qp;
 405         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 406                 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t));
 407                 if (!qp)
 408                         die_out_of_memory();
 409                 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
 410         }
 411         num_quals = n;
 412 }
 413
 414 static void
 415 qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers)
 416 {
 417         int p;
 418
 419         if (num_quals <= n)
 420                 reallocate_qual(n + 1);
 421
 422         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 423                 if (pers == p || pers < 0) {
 424                         if (not)
 425                                 qual_vec[p][n] &= ~bitflag;
 426                         else
 427                                 qual_vec[p][n] |= bitflag;
 428                 }
 429         }
 430 }
 431
 432 static int
 433 qual_syscall(const char *s, const unsigned int bitflag, const int not)
 434 {
 435         int p;
 436         unsigned int i;
 437         int rc = -1;
 438
 439         if (*s >= '0' && *s <= '9') {
 440                 i = string_to_uint(s);
 441                 if (i >= MAX_NSYSCALLS)
 442                         return -1;
 443                 qualify_one(i, bitflag, not, -1);
 444                 return 0;
 445         }
 446
 447         for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
 448                 for (i = 0; i < nsyscall_vec[p]; i++) {
 449                         if (sysent_vec[p][i].sys_name
 450                          && strcmp(s, sysent_vec[p][i].sys_name) == 0
 451                         ) {
 452                                 qualify_one(i, bitflag, not, p);
 453                                 rc = 0;
 454                         }
 455                 }
 456         }
 457
 458         return rc;
 459 }
 460
 461 static int
 462 qual_signal(const char *s, const unsigned int bitflag, const int not)
 463 {
 464         unsigned int i;
 465
 466         if (*s >= '0' && *s <= '9') {
 467                 int signo = string_to_uint(s);
 468                 if (signo < 0 || signo > 255)
 469                         return -1;
 470                 qualify_one(signo, bitflag, not, -1);
 471                 return 0;
 472         }
 473         if (strncasecmp(s, "SIG", 3) == 0)
 474                 s += 3;
 475         for (i = 0; i <= NSIG; i++) {
 476                 if (strcasecmp(s, signame(i) + 3) == 0) {
 477                         qualify_one(i, bitflag, not, -1);
 478                         return 0;
 479                 }
 480         }
 481         return -1;
 482 }
 483
 484 static int
 485 qual_desc(const char *s, const unsigned int bitflag, const int not)
 486 {
 487         if (*s >= '0' && *s <= '9') {
 488                 int desc = string_to_uint(s);
 489                 if (desc < 0 || desc > 0x7fff) /* paranoia */
 490                         return -1;
 491                 qualify_one(desc, bitflag, not, -1);
 492                 return 0;
 493         }
 494         return -1;
 495 }
 496
 497 static int
 498 lookup_class(const char *s)
 499 {
 500         if (strcmp(s, "file") == 0)
 501                 return TRACE_FILE;
 502         if (strcmp(s, "ipc") == 0)
 503                 return TRACE_IPC;
 504         if (strcmp(s, "network") == 0)
 505                 return TRACE_NETWORK;
 506         if (strcmp(s, "process") == 0)
 507                 return TRACE_PROCESS;
 508         if (strcmp(s, "signal") == 0)
 509                 return TRACE_SIGNAL;
 510         if (strcmp(s, "desc") == 0)
 511                 return TRACE_DESC;
 512         if (strcmp(s, "memory") == 0)
 513                 return TRACE_MEMORY;
 514         return -1;
 515 }
 516
 517 void
 518 qualify(const char *s)
 519 {
 520         const struct qual_options *opt;
 521         char *copy;
 522         const char *p;
 523         int not;
 524         unsigned int i;
 525
 526         if (num_quals == 0)
 527                 reallocate_qual(MIN_QUALS);
 528
 529         opt = &qual_options[0];
 530         for (i = 0; (p = qual_options[i].option_name); i++) {
 531                 unsigned int len = strlen(p);
 532                 if (strncmp(s, p, len) == 0 && s[len] == '=') {
 533                         opt = &qual_options[i];
 534                         s += len + 1;
 535                         break;
 536                 }
 537         }
 538         not = 0;
 539         if (*s == '!') {
 540                 not = 1;
 541                 s++;
 542         }
 543         if (strcmp(s, "none") == 0) {
 544                 not = 1 - not;
 545                 s = "all";
 546         }
 547         if (strcmp(s, "all") == 0) {
 548                 for (i = 0; i < num_quals; i++) {
 549                         qualify_one(i, opt->bitflag, not, -1);
 550                 }
 551                 return;
 552         }
 553         for (i = 0; i < num_quals; i++) {
 554                 qualify_one(i, opt->bitflag, !not, -1);
 555         }
 556         copy = strdup(s);
 557         if (!copy)
 558                 die_out_of_memory();
 559         for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
 560                 int n;
 561                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 562                         unsigned pers;
 563                         for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
 564                                 for (i = 0; i < nsyscall_vec[pers]; i++)
 565                                         if (sysent_vec[pers][i].sys_flags & n)
 566                                                 qualify_one(i, opt->bitflag, not, pers);
 567                         }
 568                         continue;
 569                 }
 570                 if (opt->qualify(p, opt->bitflag, not)) {
 571                         error_msg_and_die("invalid %s '%s'",
 572                                 opt->argument_name, p);
 573                 }
 574         }
 575         free(copy);
 576         return;
 577 }
 578
 579 #ifdef SYS_socket_subcall
 580 static void
 581 decode_socket_subcall(struct tcb *tcp)
 582 {
 583         unsigned long addr;
 584         unsigned int i, n, size;
 585
 586         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
 587                 return;
 588
 589         tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
 590         tcp->qual_flg = qual_flags[tcp->scno];
 591         tcp->s_ent = &sysent[tcp->scno];
 592         addr = tcp->u_arg[1];
 593         size = current_wordsize;
 594         n = tcp->s_ent->nargs;
 595         for (i = 0; i < n; ++i) {
 596                 if (size == sizeof(int)) {
 597                         unsigned int arg;
 598                         if (umove(tcp, addr, &arg) < 0)
 599                                 arg = 0;
 600                         tcp->u_arg[i] = arg;
 601                 }
 602                 else {
 603                         unsigned long arg;
 604                         if (umove(tcp, addr, &arg) < 0)
 605                                 arg = 0;
 606                         tcp->u_arg[i] = arg;
 607                 }
 608                 addr += size;
 609         }
 610 }
 611 #endif
 612
 613 #ifdef SYS_ipc_subcall
 614 static void
 615 decode_ipc_subcall(struct tcb *tcp)
 616 {
 617         unsigned int i, n;
 618
 619         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
 620                 return;
 621
 622         tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
 623         tcp->qual_flg = qual_flags[tcp->scno];
 624         tcp->s_ent = &sysent[tcp->scno];
 625         n = tcp->s_ent->nargs;
 626         for (i = 0; i < n; i++)
 627                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 628 }
 629 #endif
 630
 631 int
 632 printargs(struct tcb *tcp)
 633 {
 634         if (entering(tcp)) {
 635                 int i;
 636                 int n = tcp->s_ent->nargs;
 637                 for (i = 0; i < n; i++)
 638                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
 639         }
 640         return 0;
 641 }
 642
 643 int
 644 printargs_lu(struct tcb *tcp)
 645 {
 646         if (entering(tcp)) {
 647                 int i;
 648                 int n = tcp->s_ent->nargs;
 649                 for (i = 0; i < n; i++)
 650                         tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
 651         }
 652         return 0;
 653 }
 654
 655 int
 656 printargs_ld(struct tcb *tcp)
 657 {
 658         if (entering(tcp)) {
 659                 int i;
 660                 int n = tcp->s_ent->nargs;
 661                 for (i = 0; i < n; i++)
 662                         tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
 663         }
 664         return 0;
 665 }
 666
 667 #if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH)
 668 long
 669 getrval2(struct tcb *tcp)
 670 {
 671         long val;
 672
 673 # if defined(SPARC) || defined(SPARC64)
 674         val = sparc_regs.u_regs[U_REG_O1];
 675 # elif defined(SH)
 676         if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0)
 677                 return -1;
 678 # elif defined(IA64)
 679         if (upeek(tcp->pid, PT_R9, &val) < 0)
 680                 return -1;
 681 # endif
 682
 683         return val;
 684 }
 685 #endif
 686
 687 #if defined(I386)
 688 static struct user_regs_struct i386_regs;
 689 /* Cast suppresses signedness warning (.esp is long, not unsigned long) */
 690 uint32_t *const i386_esp_ptr = (uint32_t*)&i386_regs.esp;
 691 # define ARCH_REGS_FOR_GETREGSET i386_regs
 692 #elif defined(X86_64) || defined(X32)
 693 /*
 694  * On i386, pt_regs and user_regs_struct are the same,
 695  * but on 64 bit x86, user_regs_struct has six more fields:
 696  * fs_base, gs_base, ds, es, fs, gs.
 697  * PTRACE_GETREGS fills them too, so struct pt_regs would overflow.
 698  */
 699 struct i386_user_regs_struct {
 700         uint32_t ebx;
 701         uint32_t ecx;
 702         uint32_t edx;
 703         uint32_t esi;
 704         uint32_t edi;
 705         uint32_t ebp;
 706         uint32_t eax;
 707         uint32_t xds;
 708         uint32_t xes;
 709         uint32_t xfs;
 710         uint32_t xgs;
 711         uint32_t orig_eax;
 712         uint32_t eip;
 713         uint32_t xcs;
 714         uint32_t eflags;
 715         uint32_t esp;
 716         uint32_t xss;
 717 };
 718 static union {
 719         struct user_regs_struct      x86_64_r;
 720         struct i386_user_regs_struct i386_r;
 721 } x86_regs_union;
 722 # define x86_64_regs x86_regs_union.x86_64_r
 723 # define i386_regs   x86_regs_union.i386_r
 724 uint32_t *const i386_esp_ptr = &i386_regs.esp;
 725 static struct iovec x86_io = {
 726         .iov_base = &x86_regs_union
 727 };
 728 #elif defined(IA64)
 729 bool ia64_ia32mode = 0; /* not static */
 730 static long ia64_r8, ia64_r10;
 731 #elif defined(POWERPC)
 732 struct pt_regs ppc_regs;
 733 #elif defined(M68K)
 734 static long m68k_d0;
 735 #elif defined(BFIN)
 736 static long bfin_r0;
 737 #elif defined(ARM)
 738 struct pt_regs arm_regs; /* not static */
 739 # define ARCH_REGS_FOR_GETREGSET arm_regs
 740 #elif defined(AARCH64)
 741 static union {
 742         struct user_pt_regs aarch64_r;
 743         struct arm_pt_regs  arm_r;
 744 } arm_regs_union;
 745 # define aarch64_regs arm_regs_union.aarch64_r
 746 # define arm_regs     arm_regs_union.arm_r
 747 static struct iovec aarch64_io = {
 748         .iov_base = &arm_regs_union
 749 };
 750 #elif defined(ALPHA)
 751 static long alpha_r0;
 752 static long alpha_a3;
 753 #elif defined(AVR32)
 754 static struct pt_regs avr32_regs;
 755 #elif defined(SPARC) || defined(SPARC64)
 756 struct pt_regs sparc_regs; /* not static */
 757 #elif defined(LINUX_MIPSN32)
 758 static long long mips_a3;
 759 static long long mips_r2;
 760 #elif defined(MIPS)
 761 static long mips_a3;
 762 static long mips_r2;
 763 #elif defined(S390) || defined(S390X)
 764 static long s390_gpr2;
 765 #elif defined(HPPA)
 766 static long hppa_r28;
 767 #elif defined(SH)
 768 static long sh_r0;
 769 #elif defined(SH64)
 770 static long sh64_r9;
 771 #elif defined(CRISV10) || defined(CRISV32)
 772 static long cris_r10;
 773 #elif defined(TILE)
 774 struct pt_regs tile_regs;
 775 #elif defined(MICROBLAZE)
 776 static long microblaze_r3;
 777 #elif defined(OR1K)
 778 static struct user_regs_struct or1k_regs;
 779 # define ARCH_REGS_FOR_GETREGSET or1k_regs
 780 #elif defined(METAG)
 781 static struct user_gp_regs metag_regs;
 782 # define ARCH_REGS_FOR_GETREGSET metag_regs
 783 #elif defined(XTENSA)
 784 static long xtensa_a2;
 785 # elif defined(ARC)
 786 static struct user_regs_struct arc_regs;
 787 # define ARCH_REGS_FOR_GETREGSET arc_regs
 788 #endif
 789
 790 void
 791 print_pc(struct tcb *tcp)
 792 {
 793 #define PRINTBADPC tprintf(sizeof(long) == 4 ? "[????????] " : \
 794                            sizeof(long) == 8 ? "[????????????????] " : \
 795                            NULL /* crash */)
 796         if (get_regs_error) {
 797                 PRINTBADPC;
 798                 return;
 799         }
 800 #if defined(I386)
 801         tprintf("[%08lx] ", i386_regs.eip);
 802 #elif defined(S390) || defined(S390X)
 803         long psw;
 804         if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) {
 805                 PRINTBADPC;
 806                 return;
 807         }
 808 # ifdef S390
 809         tprintf("[%08lx] ", psw);
 810 # elif S390X
 811         tprintf("[%016lx] ", psw);
 812 # endif
 813 #elif defined(X86_64) || defined(X32)
 814         if (x86_io.iov_len == sizeof(i386_regs)) {
 815                 tprintf("[%08x] ", (unsigned) i386_regs.eip);
 816         } else {
 817 # if defined(X86_64)
 818                 tprintf("[%016lx] ", (unsigned long) x86_64_regs.rip);
 819 # elif defined(X32)
 820                 /* Note: this truncates 64-bit rip to 32 bits */
 821                 tprintf("[%08lx] ", (unsigned long) x86_64_regs.rip);
 822 # endif
 823         }
 824 #elif defined(IA64)
 825         long ip;
 826         if (upeek(tcp->pid, PT_B0, &ip) < 0) {
 827                 PRINTBADPC;
 828                 return;
 829         }
 830         tprintf("[%08lx] ", ip);
 831 #elif defined(POWERPC)
 832         long pc = ppc_regs.nip;
 833 # ifdef POWERPC64
 834         tprintf("[%016lx] ", pc);
 835 # else
 836         tprintf("[%08lx] ", pc);
 837 # endif
 838 #elif defined(M68K)
 839         long pc;
 840         if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) {
 841                 tprints("[????????] ");
 842                 return;
 843         }
 844         tprintf("[%08lx] ", pc);
 845 #elif defined(ALPHA)
 846         long pc;
 847         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 848                 tprints("[????????????????] ");
 849                 return;
 850         }
 851         tprintf("[%08lx] ", pc);
 852 #elif defined(SPARC)
 853         tprintf("[%08lx] ", sparc_regs.pc);
 854 #elif defined(SPARC64)
 855         tprintf("[%08lx] ", sparc_regs.tpc);
 856 #elif defined(HPPA)
 857         long pc;
 858         if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) {
 859                 tprints("[????????] ");
 860                 return;
 861         }
 862         tprintf("[%08lx] ", pc);
 863 #elif defined(MIPS)
 864         long pc;
 865         if (upeek(tcp->pid, REG_EPC, &pc) < 0) {
 866                 tprints("[????????] ");
 867                 return;
 868         }
 869         tprintf("[%08lx] ", pc);
 870 #elif defined(SH)
 871         long pc;
 872         if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) {
 873                 tprints("[????????] ");
 874                 return;
 875         }
 876         tprintf("[%08lx] ", pc);
 877 #elif defined(SH64)
 878         long pc;
 879         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 880                 tprints("[????????????????] ");
 881                 return;
 882         }
 883         tprintf("[%08lx] ", pc);
 884 #elif defined(ARM)
 885         tprintf("[%08lx] ", arm_regs.ARM_pc);
 886 #elif defined(AARCH64)
 887         /* tprintf("[%016lx] ", aarch64_regs.regs[???]); */
 888 #elif defined(AVR32)
 889         tprintf("[%08lx] ", avr32_regs.pc);
 890 #elif defined(BFIN)
 891         long pc;
 892         if (upeek(tcp->pid, PT_PC, &pc) < 0) {
 893                 PRINTBADPC;
 894                 return;
 895         }
 896         tprintf("[%08lx] ", pc);
 897 #elif defined(CRISV10)
 898         long pc;
 899         if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) {
 900                 PRINTBADPC;
 901                 return;
 902         }
 903         tprintf("[%08lx] ", pc);
 904 #elif defined(CRISV32)
 905         long pc;
 906         if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) {
 907                 PRINTBADPC;
 908                 return;
 909         }
 910         tprintf("[%08lx] ", pc);
 911 #elif defined(TILE)
 912 # ifdef _LP64
 913         tprintf("[%016lx] ", (unsigned long) tile_regs.pc);
 914 # else
 915         tprintf("[%08lx] ", (unsigned long) tile_regs.pc);
 916 # endif
 917 #elif defined(OR1K)
 918         tprintf("[%08lx] ", or1k_regs.pc);
 919 #elif defined(METAG)
 920         tprintf("[%08lx] ", metag_regs.pc);
 921 #elif defined(XTENSA)
 922         long pc;
 923         if (upeek(tcp->pid, REG_PC, &pc) < 0) {
 924                 PRINTBADPC;
 925                 return;
 926         }
 927         tprintf("[%08lx] ", pc);
 928 #elif defined(ARC)
 929         tprintf("[%08lx] ", arc_regs.efa);
 930 #endif /* architecture */
 931 }
 932
 933 /*
 934  * Shuffle syscall numbers so that we don't have huge gaps in syscall table.
 935  * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n.
 936  */
 937 #if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */
 938 static long
 939 shuffle_scno(unsigned long scno)
 940 {
 941         if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
 942                 return scno;
 943
 944         /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
 945         if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
 946                 return 0x000ffff0;
 947         if (scno == 0x000ffff0)
 948                 return ARM_FIRST_SHUFFLED_SYSCALL;
 949
 950 #define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
 951         /*
 952          * Is it ARM specific syscall?
 953          * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
 954          * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
 955          */
 956         if (scno >= 0x000f0000 &&
 957             scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
 958                 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
 959         }
 960         if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
 961                 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
 962         }
 963
 964         return scno;
 965 }
 966 #else
 967 # define shuffle_scno(scno) ((long)(scno))
 968 #endif
 969
 970 static char*
 971 undefined_scno_name(struct tcb *tcp)
 972 {
 973         static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
 974
 975         sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
 976         return buf;
 977 }
 978
 979 #ifdef POWERPC
 980 /*
 981  * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23,
 982  * we provide a slow fallback for old kernels.
 983  */
 984 static int powerpc_getregs_old(pid_t pid)
 985 {
 986         int i;
 987         long r;
 988
 989         if (iflag) {
 990                 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip);
 991                 if (r)
 992                         goto out;
 993         }
 994 #ifdef POWERPC64 /* else we never use it */
 995         r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr);
 996         if (r)
 997                 goto out;
 998 #endif
 999         r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr);
1000         if (r)
1001                 goto out;
1002         r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3);
1003         if (r)
1004                 goto out;
1005         for (i = 0; i <= 8; i++) {
1006                 r = upeek(pid, sizeof(long) * (PT_R0 + i),
1007                           (long *)&ppc_regs.gpr[i]);
1008                 if (r)
1009                         goto out;
1010         }
1011  out:
1012         return r;
1013 }
1014 #endif
1015
1016 #ifndef get_regs
1017 long get_regs_error;
1018
1019 #if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS)
1020 static void get_regset(pid_t pid)
1021 {
1022 /* constant iovec */
1023 # if defined(ARM) \
1024   || defined(I386) \
1025   || defined(METAG) \
1026   || defined(OR1K) \
1027   || defined(ARC)
1028         static struct iovec io = {
1029                 .iov_base = &ARCH_REGS_FOR_GETREGSET,
1030                 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1031         };
1032         get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1033
1034 /* variable iovec */
1035 # elif defined(X86_64) || defined(X32)
1036         /* x86_io.iov_base = &x86_regs_union; - already is */
1037         x86_io.iov_len = sizeof(x86_regs_union);
1038         get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &x86_io);
1039 # elif defined(AARCH64)
1040         /* aarch64_io.iov_base = &arm_regs_union; - already is */
1041         aarch64_io.iov_len = sizeof(arm_regs_union);
1042         get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &aarch64_io);
1043 # else
1044 #  warning both PTRACE_GETREGSET and NT_PRSTATUS are available but not yet used
1045 # endif
1046 }
1047 #endif /* PTRACE_GETREGSET && NT_PRSTATUS */
1048
1049 void
1050 get_regs(pid_t pid)
1051 {
1052 /* PTRACE_GETREGSET only */
1053 # if defined(METAG) || defined(OR1K) || defined(X32) || defined(AARCH64) || defined(ARC)
1054         get_regset(pid);
1055
1056 /* PTRACE_GETREGS only */
1057 # elif defined(AVR32)
1058         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &avr32_regs);
1059 # elif defined(TILE)
1060         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &tile_regs);
1061 # elif defined(SPARC) || defined(SPARC64)
1062         get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&sparc_regs, 0);
1063 # elif defined(POWERPC)
1064         static bool old_kernel = 0;
1065         if (old_kernel)
1066                 goto old;
1067         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, (long) &ppc_regs);
1068         if (get_regs_error && errno == EIO) {
1069                 old_kernel = 1;
1070  old:
1071                 get_regs_error = powerpc_getregs_old(pid);
1072         }
1073
1074 /* try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS */
1075 # else
1076 #  if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS)
1077         static int getregset_support;
1078
1079         if (getregset_support >= 0) {
1080                 get_regset(pid);
1081                 if (getregset_support > 0)
1082                         return;
1083                 if (get_regs_error >= 0) {
1084                         getregset_support = 1;
1085                         return;
1086                 }
1087                 if (errno == EPERM || errno == ESRCH)
1088                         return;
1089                 getregset_support = -1;
1090         }
1091 #  endif /* PTRACE_GETREGSET && NT_PRSTATUS */
1092 #  if defined(ARM)
1093         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &arm_regs);
1094 #  elif defined(I386)
1095         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &i386_regs);
1096 #  elif defined(X86_64)
1097         /* Use old method, with unreliable heuristical detection of 32-bitness. */
1098         x86_io.iov_len = sizeof(x86_64_regs);
1099         get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs);
1100         if (!get_regs_error && x86_64_regs.cs == 0x23) {
1101                 x86_io.iov_len = sizeof(i386_regs);
1102                 /*
1103                  * The order is important: i386_regs and x86_64_regs
1104                  * are overlaid in memory!
1105                  */
1106                 i386_regs.ebx = x86_64_regs.rbx;
1107                 i386_regs.ecx = x86_64_regs.rcx;
1108                 i386_regs.edx = x86_64_regs.rdx;
1109                 i386_regs.esi = x86_64_regs.rsi;
1110                 i386_regs.edi = x86_64_regs.rdi;
1111                 i386_regs.ebp = x86_64_regs.rbp;
1112                 i386_regs.eax = x86_64_regs.rax;
1113                 /* i386_regs.xds = x86_64_regs.ds; unused by strace */
1114                 /* i386_regs.xes = x86_64_regs.es; ditto... */
1115                 /* i386_regs.xfs = x86_64_regs.fs; */
1116                 /* i386_regs.xgs = x86_64_regs.gs; */
1117                 i386_regs.orig_eax = x86_64_regs.orig_rax;
1118                 i386_regs.eip = x86_64_regs.rip;
1119                 /* i386_regs.xcs = x86_64_regs.cs; */
1120                 /* i386_regs.eflags = x86_64_regs.eflags; */
1121                 i386_regs.esp = x86_64_regs.rsp;
1122                 /* i386_regs.xss = x86_64_regs.ss; */
1123         }
1124 #  else
1125 #   error unhandled architecture
1126 #  endif /* ARM || I386 || X86_64 */
1127 # endif
1128 }
1129 #endif /* !get_regs */
1130
1131 /* Returns:
1132  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1133  * 1: ok, continue in trace_syscall_entering().
1134  * other: error, trace_syscall_entering() should print error indicator
1135  *    ("????" etc) and bail out.
1136  */
1137 static int
1138 get_scno(struct tcb *tcp)
1139 {
1140         long scno = 0;
1141
1142 #if defined(S390) || defined(S390X)
1143         if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0)
1144                 return -1;
1145
1146         if (s390_gpr2 != -ENOSYS) {
1147                 /*
1148                  * Since kernel version 2.5.44 the scno gets passed in gpr2.
1149                  */
1150                 scno = s390_gpr2;
1151         } else {
1152                 /*
1153                  * Old style of "passing" the scno via the SVC instruction.
1154                  */
1155                 long psw;
1156                 long opcode, offset_reg, tmp;
1157                 void *svc_addr;
1158                 static const int gpr_offset[16] = {
1159                                 PT_GPR0,  PT_GPR1,  PT_ORIGGPR2, PT_GPR3,
1160                                 PT_GPR4,  PT_GPR5,  PT_GPR6,     PT_GPR7,
1161                                 PT_GPR8,  PT_GPR9,  PT_GPR10,    PT_GPR11,
1162                                 PT_GPR12, PT_GPR13, PT_GPR14,    PT_GPR15
1163                 };
1164
1165                 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0)
1166                         return -1;
1167                 errno = 0;
1168                 opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0);
1169                 if (errno) {
1170                         perror_msg("peektext(psw-oneword)");
1171                         return -1;
1172                 }
1173
1174                 /*
1175                  *  We have to check if the SVC got executed directly or via an
1176                  *  EXECUTE instruction. In case of EXECUTE it is necessary to do
1177                  *  instruction decoding to derive the system call number.
1178                  *  Unfortunately the opcode sizes of EXECUTE and SVC are differently,
1179                  *  so that this doesn't work if a SVC opcode is part of an EXECUTE
1180                  *  opcode. Since there is no way to find out the opcode size this
1181                  *  is the best we can do...
1182                  */
1183                 if ((opcode & 0xff00) == 0x0a00) {
1184                         /* SVC opcode */
1185                         scno = opcode & 0xff;
1186                 }
1187                 else {
1188                         /* SVC got executed by EXECUTE instruction */
1189
1190                         /*
1191                          *  Do instruction decoding of EXECUTE. If you really want to
1192                          *  understand this, read the Principles of Operations.
1193                          */
1194                         svc_addr = (void *) (opcode & 0xfff);
1195
1196                         tmp = 0;
1197                         offset_reg = (opcode & 0x000f0000) >> 16;
1198                         if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0))
1199                                 return -1;
1200                         svc_addr += tmp;
1201
1202                         tmp = 0;
1203                         offset_reg = (opcode & 0x0000f000) >> 12;
1204                         if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0))
1205                                 return -1;
1206                         svc_addr += tmp;
1207
1208                         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0);
1209                         if (errno)
1210                                 return -1;
1211 # if defined(S390X)
1212                         scno >>= 48;
1213 # else
1214                         scno >>= 16;
1215 # endif
1216                         tmp = 0;
1217                         offset_reg = (opcode & 0x00f00000) >> 20;
1218                         if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0))
1219                                 return -1;
1220
1221                         scno = (scno | tmp) & 0xff;
1222                 }
1223         }
1224 #elif defined(POWERPC)
1225         scno = ppc_regs.gpr[0];
1226 # ifdef POWERPC64
1227         unsigned int currpers;
1228
1229         /*
1230          * Check for 64/32 bit mode.
1231          * Embedded implementations covered by Book E extension of PPC use
1232          * bit 0 (CM) of 32-bit Machine state register (MSR).
1233          * Other implementations use bit 0 (SF) of 64-bit MSR.
1234          */
1235         currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1;
1236         update_personality(tcp, currpers);
1237 # endif
1238 #elif defined(AVR32)
1239         scno = avr32_regs.r8;
1240 #elif defined(BFIN)
1241         if (upeek(tcp->pid, PT_ORIG_P0, &scno))
1242                 return -1;
1243 #elif defined(I386)
1244         scno = i386_regs.orig_eax;
1245 #elif defined(X86_64) || defined(X32)
1246 # ifndef __X32_SYSCALL_BIT
1247 #  define __X32_SYSCALL_BIT     0x40000000
1248 # endif
1249         unsigned int currpers;
1250 # if 1
1251         /* GETREGSET of NT_PRSTATUS tells us regset size,
1252          * which unambiguously detects i386.
1253          *
1254          * Linux kernel distinguishes x86-64 and x32 processes
1255          * solely by looking at __X32_SYSCALL_BIT:
1256          * arch/x86/include/asm/compat.h::is_x32_task():
1257          * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
1258          *         return true;
1259          */
1260         if (x86_io.iov_len == sizeof(i386_regs)) {
1261                 scno = i386_regs.orig_eax;
1262                 currpers = 1;
1263         } else {
1264                 scno = x86_64_regs.orig_rax;
1265                 currpers = 0;
1266                 if (scno & __X32_SYSCALL_BIT) {
1267                         /*
1268                          * Syscall number -1 requires special treatment:
1269                          * it might be a side effect of SECCOMP_RET_ERRNO
1270                          * filtering that sets orig_rax to -1
1271                          * in some versions of linux kernel.
1272                          * If that is the case, then
1273                          * __X32_SYSCALL_BIT logic does not apply.
1274                          */
1275                         if ((long long) x86_64_regs.orig_rax != -1) {
1276                                 scno -= __X32_SYSCALL_BIT;
1277                                 currpers = 2;
1278                         } else {
1279 #  ifdef X32
1280                                 currpers = 2;
1281 #  endif
1282                         }
1283                 }
1284         }
1285 # elif 0
1286         /* cs = 0x33 for long mode (native 64 bit and x32)
1287          * cs = 0x23 for compatibility mode (32 bit)
1288          * ds = 0x2b for x32 mode (x86-64 in 32 bit)
1289          */
1290         scno = x86_64_regs.orig_rax;
1291         switch (x86_64_regs.cs) {
1292                 case 0x23: currpers = 1; break;
1293                 case 0x33:
1294                         if (x86_64_regs.ds == 0x2b) {
1295                                 currpers = 2;
1296                                 scno &= ~__X32_SYSCALL_BIT;
1297                         } else
1298                                 currpers = 0;
1299                         break;
1300                 default:
1301                         fprintf(stderr, "Unknown value CS=0x%08X while "
1302                                  "detecting personality of process "
1303                                  "PID=%d\n", (int)x86_64_regs.cs, tcp->pid);
1304                         currpers = current_personality;
1305                         break;
1306         }
1307 # elif 0
1308         /* This version analyzes the opcode of a syscall instruction.
1309          * (int 0x80 on i386 vs. syscall on x86-64)
1310          * It works, but is too complicated, and strictly speaking, unreliable.
1311          */
1312         unsigned long call, rip = x86_64_regs.rip;
1313         /* sizeof(syscall) == sizeof(int 0x80) == 2 */
1314         rip -= 2;
1315         errno = 0;
1316         call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0);
1317         if (errno)
1318                 fprintf(stderr, "ptrace_peektext failed: %s\n",
1319                                 strerror(errno));
1320         switch (call & 0xffff) {
1321                 /* x86-64: syscall = 0x0f 0x05 */
1322                 case 0x050f: currpers = 0; break;
1323                 /* i386: int 0x80 = 0xcd 0x80 */
1324                 case 0x80cd: currpers = 1; break;
1325                 default:
1326                         currpers = current_personality;
1327                         fprintf(stderr,
1328                                 "Unknown syscall opcode (0x%04X) while "
1329                                 "detecting personality of process "
1330                                 "PID=%d\n", (int)call, tcp->pid);
1331                         break;
1332         }
1333 # endif
1334
1335 # ifdef X32
1336         /* If we are built for a x32 system, then personality 0 is x32
1337          * (not x86_64), and stracing of x86_64 apps is not supported.
1338          * Stracing of i386 apps is still supported.
1339          */
1340         if (currpers == 0) {
1341                 fprintf(stderr, "syscall_%lu(...) in unsupported "
1342                                 "64-bit mode of process PID=%d\n",
1343                         scno, tcp->pid);
1344                 return 0;
1345         }
1346         currpers &= ~2; /* map 2,1 to 0,1 */
1347 # endif
1348         update_personality(tcp, currpers);
1349 #elif defined(IA64)
1350 #       define IA64_PSR_IS      ((long)1 << 34)
1351         long psr;
1352         if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0)
1353                 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0);
1354         if (ia64_ia32mode) {
1355                 if (upeek(tcp->pid, PT_R1, &scno) < 0)
1356                         return -1;
1357         } else {
1358                 if (upeek(tcp->pid, PT_R15, &scno) < 0)
1359                         return -1;
1360         }
1361 #elif defined(AARCH64)
1362         switch (aarch64_io.iov_len) {
1363                 case sizeof(aarch64_regs):
1364                         /* We are in 64-bit mode */
1365                         scno = aarch64_regs.regs[8];
1366                         update_personality(tcp, 1);
1367                         break;
1368                 case sizeof(arm_regs):
1369                         /* We are in 32-bit mode */
1370                         /* Note: we don't support OABI, unlike 32-bit ARM build */
1371                         scno = arm_regs.ARM_r7;
1372                         scno = shuffle_scno(scno);
1373                         update_personality(tcp, 0);
1374                         break;
1375         }
1376 #elif defined(ARM)
1377         if (arm_regs.ARM_ip != 0) {
1378                 /* It is not a syscall entry */
1379                 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
1380                 tcp->flags |= TCB_INSYSCALL;
1381                 return 0;
1382         }
1383         /* Note: we support only 32-bit CPUs, not 26-bit */
1384
1385 # if !defined(__ARM_EABI__) || ENABLE_ARM_OABI
1386         if (arm_regs.ARM_cpsr & 0x20)
1387                 /* Thumb mode */
1388                 goto scno_in_r7;
1389         /* ARM mode */
1390         /* Check EABI/OABI by examining SVC insn's low 24 bits */
1391         errno = 0;
1392         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL);
1393         if (errno)
1394                 return -1;
1395         /* EABI syscall convention? */
1396         if ((unsigned long) scno != 0xef000000) {
1397                 /* No, it's OABI */
1398                 if ((scno & 0x0ff00000) != 0x0f900000) {
1399                         fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n",
1400                                 tcp->pid, scno);
1401                         return -1;
1402                 }
1403                 /* Fixup the syscall number */
1404                 scno &= 0x000fffff;
1405         } else {
1406  scno_in_r7:
1407                 scno = arm_regs.ARM_r7;
1408         }
1409 # else /* __ARM_EABI__ || !ENABLE_ARM_OABI */
1410         scno = arm_regs.ARM_r7;
1411 # endif
1412         scno = shuffle_scno(scno);
1413 #elif defined(M68K)
1414         if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0)
1415                 return -1;
1416 #elif defined(LINUX_MIPSN32)
1417         unsigned long long regs[38];
1418
1419         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
1420                 return -1;
1421         mips_a3 = regs[REG_A3];
1422         mips_r2 = regs[REG_V0];
1423
1424         scno = mips_r2;
1425         if (!SCNO_IN_RANGE(scno)) {
1426                 if (mips_a3 == 0 || mips_a3 == -1) {
1427                         if (debug_flag)
1428                                 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
1429                         return 0;
1430                 }
1431         }
1432 #elif defined(MIPS)
1433         if (upeek(tcp->pid, REG_A3, &mips_a3) < 0)
1434                 return -1;
1435         if (upeek(tcp->pid, REG_V0, &scno) < 0)
1436                 return -1;
1437
1438         if (!SCNO_IN_RANGE(scno)) {
1439                 if (mips_a3 == 0 || mips_a3 == -1) {
1440                         if (debug_flag)
1441                                 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
1442                         return 0;
1443                 }
1444         }
1445 #elif defined(ALPHA)
1446         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
1447                 return -1;
1448         if (upeek(tcp->pid, REG_R0, &scno) < 0)
1449                 return -1;
1450
1451         /*
1452          * Do some sanity checks to figure out if it's
1453          * really a syscall entry
1454          */
1455         if (!SCNO_IN_RANGE(scno)) {
1456                 if (alpha_a3 == 0 || alpha_a3 == -1) {
1457                         if (debug_flag)
1458                                 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno);
1459                         return 0;
1460                 }
1461         }
1462 #elif defined(SPARC) || defined(SPARC64)
1463         /* Disassemble the syscall trap. */
1464         /* Retrieve the syscall trap instruction. */
1465         unsigned long trap;
1466         errno = 0;
1467 # if defined(SPARC64)
1468         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0);
1469         trap >>= 32;
1470 # else
1471         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0);
1472 # endif
1473         if (errno)
1474                 return -1;
1475
1476         /* Disassemble the trap to see what personality to use. */
1477         switch (trap) {
1478         case 0x91d02010:
1479                 /* Linux/SPARC syscall trap. */
1480                 update_personality(tcp, 0);
1481                 break;
1482         case 0x91d0206d:
1483                 /* Linux/SPARC64 syscall trap. */
1484                 update_personality(tcp, 2);
1485                 break;
1486         case 0x91d02000:
1487                 /* SunOS syscall trap. (pers 1) */
1488                 fprintf(stderr, "syscall: SunOS no support\n");
1489                 return -1;
1490         case 0x91d02008:
1491                 /* Solaris 2.x syscall trap. (per 2) */
1492                 update_personality(tcp, 1);
1493                 break;
1494         case 0x91d02009:
1495                 /* NetBSD/FreeBSD syscall trap. */
1496                 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n");
1497                 return -1;
1498         case 0x91d02027:
1499                 /* Solaris 2.x gettimeofday */
1500                 update_personality(tcp, 1);
1501                 break;
1502         default:
1503 # if defined(SPARC64)
1504                 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc);
1505 # else
1506                 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc);
1507 # endif
1508                 return -1;
1509         }
1510
1511         /* Extract the system call number from the registers. */
1512         if (trap == 0x91d02027)
1513                 scno = 156;
1514         else
1515                 scno = sparc_regs.u_regs[U_REG_G1];
1516         if (scno == 0) {
1517                 scno = sparc_regs.u_regs[U_REG_O0];
1518                 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0]));
1519         }
1520 #elif defined(HPPA)
1521         if (upeek(tcp->pid, PT_GR20, &scno) < 0)
1522                 return -1;
1523 #elif defined(SH)
1524         /*
1525          * In the new syscall ABI, the system call number is in R3.
1526          */
1527         if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0)
1528                 return -1;
1529
1530         if (scno < 0) {
1531                 /* Odd as it may seem, a glibc bug has been known to cause
1532                    glibc to issue bogus negative syscall numbers.  So for
1533                    our purposes, make strace print what it *should* have been */
1534                 long correct_scno = (scno & 0xff);
1535                 if (debug_flag)
1536                         fprintf(stderr,
1537                                 "Detected glibc bug: bogus system call"
1538                                 " number = %ld, correcting to %ld\n",
1539                                 scno,
1540                                 correct_scno);
1541                 scno = correct_scno;
1542         }
1543 #elif defined(SH64)
1544         if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0)
1545                 return -1;
1546         scno &= 0xFFFF;
1547 #elif defined(CRISV10) || defined(CRISV32)
1548         if (upeek(tcp->pid, 4*PT_R9, &scno) < 0)
1549                 return -1;
1550 #elif defined(TILE)
1551         unsigned int currpers;
1552         scno = tile_regs.regs[10];
1553 # ifdef __tilepro__
1554         currpers = 1;
1555 # else
1556 #  ifndef PT_FLAGS_COMPAT
1557 #   define PT_FLAGS_COMPAT 0x10000  /* from Linux 3.8 on */
1558 #  endif
1559         if (tile_regs.flags & PT_FLAGS_COMPAT)
1560                 currpers = 1;
1561         else
1562                 currpers = 0;
1563 # endif
1564         update_personality(tcp, currpers);
1565 #elif defined(MICROBLAZE)
1566         if (upeek(tcp->pid, 0, &scno) < 0)
1567                 return -1;
1568 #elif defined(OR1K)
1569         scno = or1k_regs.gpr[11];
1570 #elif defined(METAG)
1571         scno = metag_regs.dx[0][1];     /* syscall number in D1Re0 (D1.0) */
1572 #elif defined(XTENSA)
1573         if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0)
1574                 return -1;
1575 # elif defined(ARC)
1576         scno = arc_regs.scratch.r8;
1577 #endif
1578
1579         tcp->scno = scno;
1580         if (SCNO_IS_VALID(tcp->scno)) {
1581                 tcp->s_ent = &sysent[scno];
1582                 tcp->qual_flg = qual_flags[scno];
1583         } else {
1584                 static const struct_sysent unknown = {
1585                         .nargs = MAX_ARGS,
1586                         .sys_flags = 0,
1587                         .sys_func = printargs,
1588                         .sys_name = "unknown", /* not used */
1589                 };
1590                 tcp->s_ent = &unknown;
1591                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1592         }
1593         return 1;
1594 }
1595
1596 /* Called at each syscall entry.
1597  * Returns:
1598  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1599  * 1: ok, continue in trace_syscall_entering().
1600  * other: error, trace_syscall_entering() should print error indicator
1601  *    ("????" etc) and bail out.
1602  */
1603 static int
1604 syscall_fixup_on_sysenter(struct tcb *tcp)
1605 {
1606         /* A common case of "not a syscall entry" is post-execve SIGTRAP */
1607 #if defined(I386)
1608         if (i386_regs.eax != -ENOSYS) {
1609                 if (debug_flag)
1610                         fprintf(stderr, "not a syscall entry (eax = %ld)\n", i386_regs.eax);
1611                 return 0;
1612         }
1613 #elif defined(X86_64) || defined(X32)
1614         {
1615                 long rax;
1616                 if (x86_io.iov_len == sizeof(i386_regs)) {
1617                         /* Sign extend from 32 bits */
1618                         rax = (int32_t)i386_regs.eax;
1619                 } else {
1620                         /* Note: in X32 build, this truncates 64 to 32 bits */
1621                         rax = x86_64_regs.rax;
1622                 }
1623                 if (rax != -ENOSYS) {
1624                         if (debug_flag)
1625                                 fprintf(stderr, "not a syscall entry (rax = %ld)\n", rax);
1626                         return 0;
1627                 }
1628         }
1629 #elif defined(M68K)
1630         /* TODO? Eliminate upeek's in arches below like we did in x86 */
1631         if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0)
1632                 return -1;
1633         if (m68k_d0 != -ENOSYS) {
1634                 if (debug_flag)
1635                         fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0);
1636                 return 0;
1637         }
1638 #elif defined(IA64)
1639         if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0)
1640                 return -1;
1641         if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0)
1642                 return -1;
1643         if (ia64_ia32mode && ia64_r8 != -ENOSYS) {
1644                 if (debug_flag)
1645                         fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8);
1646                 return 0;
1647         }
1648 #elif defined(CRISV10) || defined(CRISV32)
1649         if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0)
1650                 return -1;
1651         if (cris_r10 != -ENOSYS) {
1652                 if (debug_flag)
1653                         fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10);
1654                 return 0;
1655         }
1656 #elif defined(MICROBLAZE)
1657         if (upeek(tcp->pid, 3 * 4, &microblaze_r3) < 0)
1658                 return -1;
1659         if (microblaze_r3 != -ENOSYS) {
1660                 if (debug_flag)
1661                         fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3);
1662                 return 0;
1663         }
1664 #endif
1665         return 1;
1666 }
1667
1668 static void
1669 internal_fork(struct tcb *tcp)
1670 {
1671 #if defined S390 || defined S390X || defined CRISV10 || defined CRISV32
1672 # define ARG_FLAGS      1
1673 #else
1674 # define ARG_FLAGS      0
1675 #endif
1676 #ifndef CLONE_UNTRACED
1677 # define CLONE_UNTRACED 0x00800000
1678 #endif
1679         if ((ptrace_setoptions
1680             & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
1681            == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
1682                 return;
1683
1684         if (!followfork)
1685                 return;
1686
1687         if (entering(tcp)) {
1688                 /*
1689                  * We won't see the new child if clone is called with
1690                  * CLONE_UNTRACED, so we keep the same logic with that option
1691                  * and don't trace it.
1692                  */
1693                 if ((tcp->s_ent->sys_func == sys_clone)
1694                  && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED)
1695                 )
1696                         return;
1697                 setbpt(tcp);
1698         } else {
1699                 if (tcp->flags & TCB_BPTSET)
1700                         clearbpt(tcp);
1701         }
1702 }
1703
1704 #if defined(TCB_WAITEXECVE)
1705 static void
1706 internal_exec(struct tcb *tcp)
1707 {
1708         /* Maybe we have post-execve SIGTRAP suppressed? */
1709         if (ptrace_setoptions & PTRACE_O_TRACEEXEC)
1710                 return; /* yes, no need to do anything */
1711
1712         if (exiting(tcp) && syserror(tcp))
1713                 /* Error in execve, no post-execve SIGTRAP expected */
1714                 tcp->flags &= ~TCB_WAITEXECVE;
1715         else
1716                 tcp->flags |= TCB_WAITEXECVE;
1717 }
1718 #endif
1719
1720 static void
1721 syscall_fixup_for_fork_exec(struct tcb *tcp)
1722 {
1723         /*
1724          * We must always trace a few critical system calls in order to
1725          * correctly support following forks in the presence of tracing
1726          * qualifiers.
1727          */
1728         int (*func)();
1729
1730         func = tcp->s_ent->sys_func;
1731
1732         if (   sys_fork == func
1733             || sys_clone == func
1734            ) {
1735                 internal_fork(tcp);
1736                 return;
1737         }
1738
1739 #if defined(TCB_WAITEXECVE)
1740         if (   sys_execve == func
1741 # if defined(SPARC) || defined(SPARC64)
1742             || sys_execv == func
1743 # endif
1744            ) {
1745                 internal_exec(tcp);
1746                 return;
1747         }
1748 #endif
1749 }
1750
1751 /* Return -1 on error or 1 on success (never 0!) */
1752 static int
1753 get_syscall_args(struct tcb *tcp)
1754 {
1755         int i, nargs;
1756
1757         nargs = tcp->s_ent->nargs;
1758
1759 #if defined(S390) || defined(S390X)
1760         for (i = 0; i < nargs; ++i)
1761                 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0)
1762                         return -1;
1763 #elif defined(ALPHA)
1764         for (i = 0; i < nargs; ++i)
1765                 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1766                         return -1;
1767 #elif defined(IA64)
1768         if (!ia64_ia32mode) {
1769                 unsigned long *out0, cfm, sof, sol;
1770                 long rbs_end;
1771                 /* be backwards compatible with kernel < 2.4.4... */
1772 #               ifndef PT_RBS_END
1773 #                 define PT_RBS_END     PT_AR_BSP
1774 #               endif
1775
1776                 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0)
1777                         return -1;
1778                 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0)
1779                         return -1;
1780
1781                 sof = (cfm >> 0) & 0x7f;
1782                 sol = (cfm >> 7) & 0x7f;
1783                 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol);
1784
1785                 for (i = 0; i < nargs; ++i) {
1786                         if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1787                                    sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1788                                 return -1;
1789                 }
1790         } else {
1791                 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */,
1792                                                       PT_R9  /* ECX = out1 */,
1793                                                       PT_R10 /* EDX = out2 */,
1794                                                       PT_R14 /* ESI = out3 */,
1795                                                       PT_R15 /* EDI = out4 */,
1796                                                       PT_R13 /* EBP = out5 */};
1797
1798                 for (i = 0; i < nargs; ++i) {
1799                         if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0)
1800                                 return -1;
1801                         /* truncate away IVE sign-extension */
1802                         tcp->u_arg[i] &= 0xffffffff;
1803                 }
1804         }
1805 #elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64)
1806         /* N32 and N64 both use up to six registers.  */
1807         unsigned long long regs[38];
1808
1809         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
1810                 return -1;
1811
1812         for (i = 0; i < nargs; ++i) {
1813                 tcp->u_arg[i] = regs[REG_A0 + i];
1814 # if defined(LINUX_MIPSN32)
1815                 tcp->ext_arg[i] = regs[REG_A0 + i];
1816 # endif
1817         }
1818 #elif defined(MIPS)
1819         if (nargs > 4) {
1820                 long sp;
1821
1822                 if (upeek(tcp->pid, REG_SP, &sp) < 0)
1823                         return -1;
1824                 for (i = 0; i < 4; ++i)
1825                         if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1826                                 return -1;
1827                 umoven(tcp, sp + 16, (nargs - 4) * sizeof(tcp->u_arg[0]),
1828                        (char *)(tcp->u_arg + 4));
1829         } else {
1830                 for (i = 0; i < nargs; ++i)
1831                         if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1832                                 return -1;
1833         }
1834 #elif defined(POWERPC)
1835         (void)i;
1836         (void)nargs;
1837         tcp->u_arg[0] = ppc_regs.orig_gpr3;
1838         tcp->u_arg[1] = ppc_regs.gpr[4];
1839         tcp->u_arg[2] = ppc_regs.gpr[5];
1840         tcp->u_arg[3] = ppc_regs.gpr[6];
1841         tcp->u_arg[4] = ppc_regs.gpr[7];
1842         tcp->u_arg[5] = ppc_regs.gpr[8];
1843 #elif defined(SPARC) || defined(SPARC64)
1844         for (i = 0; i < nargs; ++i)
1845                 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i];
1846 #elif defined(HPPA)
1847         for (i = 0; i < nargs; ++i)
1848                 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1849                         return -1;
1850 #elif defined(ARM) || defined(AARCH64)
1851 # if defined(AARCH64)
1852         if (tcp->currpers == 1)
1853                 for (i = 0; i < nargs; ++i)
1854                         tcp->u_arg[i] = aarch64_regs.regs[i];
1855         else
1856 # endif
1857         for (i = 0; i < nargs; ++i)
1858                 tcp->u_arg[i] = arm_regs.uregs[i];
1859 #elif defined(AVR32)
1860         (void)i;
1861         (void)nargs;
1862         tcp->u_arg[0] = avr32_regs.r12;
1863         tcp->u_arg[1] = avr32_regs.r11;
1864         tcp->u_arg[2] = avr32_regs.r10;
1865         tcp->u_arg[3] = avr32_regs.r9;
1866         tcp->u_arg[4] = avr32_regs.r5;
1867         tcp->u_arg[5] = avr32_regs.r3;
1868 #elif defined(BFIN)
1869         static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 };
1870
1871         for (i = 0; i < nargs; ++i)
1872                 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0)
1873                         return -1;
1874 #elif defined(SH)
1875         static const int syscall_regs[MAX_ARGS] = {
1876                 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6),
1877                 4 * (REG_REG0+7), 4 * (REG_REG0  ), 4 * (REG_REG0+1)
1878         };
1879
1880         for (i = 0; i < nargs; ++i)
1881                 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0)
1882                         return -1;
1883 #elif defined(SH64)
1884         int i;
1885         /* Registers used by SH5 Linux system calls for parameters */
1886         static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 };
1887
1888         for (i = 0; i < nargs; ++i)
1889                 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
1890                         return -1;
1891 #elif defined(I386)
1892         (void)i;
1893         (void)nargs;
1894         tcp->u_arg[0] = i386_regs.ebx;
1895         tcp->u_arg[1] = i386_regs.ecx;
1896         tcp->u_arg[2] = i386_regs.edx;
1897         tcp->u_arg[3] = i386_regs.esi;
1898         tcp->u_arg[4] = i386_regs.edi;
1899         tcp->u_arg[5] = i386_regs.ebp;
1900 #elif defined(X86_64) || defined(X32)
1901         (void)i;
1902         (void)nargs;
1903         if (x86_io.iov_len != sizeof(i386_regs)) {
1904                 /* x86-64 or x32 ABI */
1905                 tcp->u_arg[0] = x86_64_regs.rdi;
1906                 tcp->u_arg[1] = x86_64_regs.rsi;
1907                 tcp->u_arg[2] = x86_64_regs.rdx;
1908                 tcp->u_arg[3] = x86_64_regs.r10;
1909                 tcp->u_arg[4] = x86_64_regs.r8;
1910                 tcp->u_arg[5] = x86_64_regs.r9;
1911 #  ifdef X32
1912                 tcp->ext_arg[0] = x86_64_regs.rdi;
1913                 tcp->ext_arg[1] = x86_64_regs.rsi;
1914                 tcp->ext_arg[2] = x86_64_regs.rdx;
1915                 tcp->ext_arg[3] = x86_64_regs.r10;
1916                 tcp->ext_arg[4] = x86_64_regs.r8;
1917                 tcp->ext_arg[5] = x86_64_regs.r9;
1918 #  endif
1919         } else {
1920                 /* i386 ABI */
1921                 /* Zero-extend from 32 bits */
1922                 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers
1923                  * if you need to use *sign-extended* parameter.
1924                  */
1925                 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx;
1926                 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx;
1927                 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx;
1928                 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi;
1929                 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi;
1930                 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp;
1931         }
1932 #elif defined(MICROBLAZE)
1933         for (i = 0; i < nargs; ++i)
1934                 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0)
1935                         return -1;
1936 #elif defined(CRISV10) || defined(CRISV32)
1937         static const int crisregs[MAX_ARGS] = {
1938                 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12,
1939                 4*PT_R13     , 4*PT_MOF, 4*PT_SRP
1940         };
1941
1942         for (i = 0; i < nargs; ++i)
1943                 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0)
1944                         return -1;
1945 #elif defined(TILE)
1946         for (i = 0; i < nargs; ++i)
1947                 tcp->u_arg[i] = tile_regs.regs[i];
1948 #elif defined(M68K)
1949         for (i = 0; i < nargs; ++i)
1950                 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0)
1951                         return -1;
1952 #elif defined(OR1K)
1953         (void)nargs;
1954         for (i = 0; i < 6; ++i)
1955                 tcp->u_arg[i] = or1k_regs.gpr[3 + i];
1956 #elif defined(METAG)
1957         for (i = 0; i < nargs; i++)
1958                 /* arguments go backwards from D1Ar1 (D1.3) */
1959                 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i];
1960 #elif defined(XTENSA)
1961         /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */
1962         static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 };
1963         for (i = 0; i < nargs; ++i)
1964                 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0)
1965                         return -1;
1966 # elif defined(ARC)
1967         long *arc_args = &arc_regs.scratch.r0;
1968         for (i = 0; i < nargs; ++i)
1969                 tcp->u_arg[i] = *arc_args--;
1970
1971 #else /* Other architecture (32bits specific) */
1972         for (i = 0; i < nargs; ++i)
1973                 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0)
1974                         return -1;
1975 #endif
1976         return 1;
1977 }
1978
1979 static int
1980 trace_syscall_entering(struct tcb *tcp)
1981 {
1982         int res, scno_good;
1983
1984 #if defined TCB_WAITEXECVE
1985         if (tcp->flags & TCB_WAITEXECVE) {
1986                 /* This is the post-execve SIGTRAP. */
1987                 tcp->flags &= ~TCB_WAITEXECVE;
1988                 return 0;
1989         }
1990 #endif
1991
1992         scno_good = res = (get_regs_error ? -1 : get_scno(tcp));
1993         if (res == 0)
1994                 return res;
1995         if (res == 1) {
1996                 res = syscall_fixup_on_sysenter(tcp);
1997                 if (res == 0)
1998                         return res;
1999                 if (res == 1)
2000                         res = get_syscall_args(tcp);
2001         }
2002
2003         if (res != 1) {
2004                 printleader(tcp);
2005                 if (scno_good != 1)
2006                         tprints("????" /* anti-trigraph gap */ "(");
2007                 else if (tcp->qual_flg & UNDEFINED_SCNO)
2008                         tprintf("%s(", undefined_scno_name(tcp));
2009                 else
2010                         tprintf("%s(", tcp->s_ent->sys_name);
2011                 /*
2012                  * " <unavailable>" will be added later by the code which
2013                  * detects ptrace errors.
2014                  */
2015                 goto ret;
2016         }
2017
2018         if (   sys_execve == tcp->s_ent->sys_func
2019 # if defined(SPARC) || defined(SPARC64)
2020             || sys_execv == tcp->s_ent->sys_func
2021 # endif
2022            ) {
2023                 hide_log_until_execve = 0;
2024         }
2025
2026 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
2027         while (1) {
2028 # ifdef SYS_socket_subcall
2029                 if (tcp->s_ent->sys_func == sys_socketcall) {
2030                         decode_socket_subcall(tcp);
2031                         break;
2032                 }
2033 # endif
2034 # ifdef SYS_ipc_subcall
2035                 if (tcp->s_ent->sys_func == sys_ipc) {
2036                         decode_ipc_subcall(tcp);
2037                         break;
2038                 }
2039 # endif
2040                 break;
2041         }
2042 #endif
2043
2044         if (need_fork_exec_workarounds)
2045                 syscall_fixup_for_fork_exec(tcp);
2046
2047         if (!(tcp->qual_flg & QUAL_TRACE)
2048          || (tracing_paths && !pathtrace_match(tcp))
2049         ) {
2050                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
2051                 return 0;
2052         }
2053
2054         tcp->flags &= ~TCB_FILTERED;
2055
2056         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
2057                 res = 0;
2058                 goto ret;
2059         }
2060
2061 #ifdef USE_LIBUNWIND
2062         if (stack_trace_enabled) {
2063                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
2064                         unwind_capture_stacktrace(tcp);
2065         }
2066 #endif
2067
2068         printleader(tcp);
2069         if (tcp->qual_flg & UNDEFINED_SCNO)
2070                 tprintf("%s(", undefined_scno_name(tcp));
2071         else
2072                 tprintf("%s(", tcp->s_ent->sys_name);
2073         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
2074                 res = printargs(tcp);
2075         else
2076                 res = tcp->s_ent->sys_func(tcp);
2077
2078         fflush(tcp->outf);
2079  ret:
2080         tcp->flags |= TCB_INSYSCALL;
2081         /* Measure the entrance time as late as possible to avoid errors. */
2082         if (Tflag || cflag)
2083                 gettimeofday(&tcp->etime, NULL);
2084         return res;
2085 }
2086
2087 /* Returns:
2088  * 1: ok, continue in trace_syscall_exiting().
2089  * -1: error, trace_syscall_exiting() should print error indicator
2090  *    ("????" etc) and bail out.
2091  */
2092 static int
2093 get_syscall_result(struct tcb *tcp)
2094 {
2095 #if defined(S390) || defined(S390X)
2096         if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0)
2097                 return -1;
2098 #elif defined(POWERPC)
2099         /* already done by get_regs */
2100 #elif defined(AVR32)
2101         /* already done by get_regs */
2102 #elif defined(BFIN)
2103         if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0)
2104                 return -1;
2105 #elif defined(I386)
2106         /* already done by get_regs */
2107 #elif defined(X86_64) || defined(X32)
2108         /* already done by get_regs */
2109 #elif defined(IA64)
2110 #       define IA64_PSR_IS      ((long)1 << 34)
2111         long psr;
2112         if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0)
2113                 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0);
2114         if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0)
2115                 return -1;
2116         if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0)
2117                 return -1;
2118 #elif defined(ARM)
2119         /* already done by get_regs */
2120 #elif defined(AARCH64)
2121         /* register reading already done by get_regs */
2122
2123         /* Used to do this, but we did it on syscall entry already: */
2124         /* We are in 64-bit mode (personality 1) if register struct is aarch64_regs,
2125          * else it's personality 0.
2126          */
2127         /*update_personality(tcp, aarch64_io.iov_len == sizeof(aarch64_regs));*/
2128 #elif defined(M68K)
2129         if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0)
2130                 return -1;
2131 #elif defined(LINUX_MIPSN32)
2132         unsigned long long regs[38];
2133
2134         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
2135                 return -1;
2136         mips_a3 = regs[REG_A3];
2137         mips_r2 = regs[REG_V0];
2138 #elif defined(MIPS)
2139         if (upeek(tcp->pid, REG_A3, &mips_a3) < 0)
2140                 return -1;
2141         if (upeek(tcp->pid, REG_V0, &mips_r2) < 0)
2142                 return -1;
2143 #elif defined(ALPHA)
2144         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
2145                 return -1;
2146         if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0)
2147                 return -1;
2148 #elif defined(SPARC) || defined(SPARC64)
2149         /* already done by get_regs */
2150 #elif defined(HPPA)
2151         if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0)
2152                 return -1;
2153 #elif defined(SH)
2154         /* new syscall ABI returns result in R0 */
2155         if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0)
2156                 return -1;
2157 #elif defined(SH64)
2158         /* ABI defines result returned in r9 */
2159         if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0)
2160                 return -1;
2161 #elif defined(CRISV10) || defined(CRISV32)
2162         if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0)
2163                 return -1;
2164 #elif defined(TILE)
2165         /* already done by get_regs */
2166 #elif defined(MICROBLAZE)
2167         if (upeek(tcp->pid, 3 * 4, &microblaze_r3) < 0)
2168                 return -1;
2169 #elif defined(OR1K)
2170         /* already done by get_regs */
2171 #elif defined(METAG)
2172         /* already done by get_regs */
2173 #elif defined(XTENSA)
2174         if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0)
2175                 return -1;
2176 #elif defined(ARC)
2177         /* already done by get_regs */
2178 #endif
2179         return 1;
2180 }
2181
2182 /* Called at each syscall exit */
2183 static void
2184 syscall_fixup_on_sysexit(struct tcb *tcp)
2185 {
2186 #if defined(S390) || defined(S390X)
2187         if ((tcp->flags & TCB_WAITEXECVE)
2188                  && (s390_gpr2 == -ENOSYS || s390_gpr2 == tcp->scno)) {
2189                 /*
2190                  * Return from execve.
2191                  * Fake a return value of zero.  We leave the TCB_WAITEXECVE
2192                  * flag set for the post-execve SIGTRAP to see and reset.
2193                  */
2194                 s390_gpr2 = 0;
2195         }
2196 #endif
2197 }
2198
2199 /*
2200  * Check the syscall return value register value for whether it is
2201  * a negated errno code indicating an error, or a success return value.
2202  */
2203 static inline int
2204 is_negated_errno(unsigned long int val)
2205 {
2206         unsigned long int max = -(long int) nerrnos;
2207 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
2208         if (current_wordsize < sizeof(val)) {
2209                 val = (unsigned int) val;
2210                 max = (unsigned int) max;
2211         }
2212 #endif
2213         return val > max;
2214 }
2215
2216 #if defined(X32)
2217 static inline int
2218 is_negated_errno_x32(unsigned long long val)
2219 {
2220         unsigned long long max = -(long long) nerrnos;
2221         /*
2222          * current_wordsize is 4 even in personality 0 (native X32)
2223          * but truncation _must not_ be done in it.
2224          * can't check current_wordsize here!
2225          */
2226         if (current_personality != 0) {
2227                 val = (uint32_t) val;
2228                 max = (uint32_t) max;
2229         }
2230         return val > max;
2231 }
2232 #endif
2233
2234 /* Returns:
2235  * 1: ok, continue in trace_syscall_exiting().
2236  * -1: error, trace_syscall_exiting() should print error indicator
2237  *    ("????" etc) and bail out.
2238  */
2239 static void
2240 get_error(struct tcb *tcp)
2241 {
2242         int u_error = 0;
2243         int check_errno = 1;
2244         if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) {
2245                 check_errno = 0;
2246         }
2247 #if defined(S390) || defined(S390X)
2248         if (check_errno && is_negated_errno(s390_gpr2)) {
2249                 tcp->u_rval = -1;
2250                 u_error = -s390_gpr2;
2251         }
2252         else {
2253                 tcp->u_rval = s390_gpr2;
2254         }
2255 #elif defined(I386)
2256         if (check_errno && is_negated_errno(i386_regs.eax)) {
2257                 tcp->u_rval = -1;
2258                 u_error = -i386_regs.eax;
2259         }
2260         else {
2261                 tcp->u_rval = i386_regs.eax;
2262         }
2263 #elif defined(X86_64)
2264         long rax;
2265         if (x86_io.iov_len == sizeof(i386_regs)) {
2266                 /* Sign extend from 32 bits */
2267                 rax = (int32_t)i386_regs.eax;
2268         } else {
2269                 rax = x86_64_regs.rax;
2270         }
2271         if (check_errno && is_negated_errno(rax)) {
2272                 tcp->u_rval = -1;
2273                 u_error = -rax;
2274         }
2275         else {
2276                 tcp->u_rval = rax;
2277         }
2278 #elif defined(X32)
2279         /* In X32, return value is 64-bit (llseek uses one).
2280          * Using merely "long rax" would not work.
2281          */
2282         long long rax;
2283         if (x86_io.iov_len == sizeof(i386_regs)) {
2284                 /* Sign extend from 32 bits */
2285                 rax = (int32_t)i386_regs.eax;
2286         } else {
2287                 rax = x86_64_regs.rax;
2288         }
2289         /* Careful: is_negated_errno() works only on longs */
2290         if (check_errno && is_negated_errno_x32(rax)) {
2291                 tcp->u_rval = -1;
2292                 u_error = -rax;
2293         }
2294         else {
2295                 tcp->u_rval = rax; /* truncating */
2296                 tcp->u_lrval = rax;
2297         }
2298 #elif defined(IA64)
2299         if (ia64_ia32mode) {
2300                 int err;
2301
2302                 err = (int)ia64_r8;
2303                 if (check_errno && is_negated_errno(err)) {
2304                         tcp->u_rval = -1;
2305                         u_error = -err;
2306                 }
2307                 else {
2308                         tcp->u_rval = err;
2309                 }
2310         } else {
2311                 if (check_errno && ia64_r10) {
2312                         tcp->u_rval = -1;
2313                         u_error = ia64_r8;
2314                 } else {
2315                         tcp->u_rval = ia64_r8;
2316                 }
2317         }
2318 #elif defined(MIPS)
2319         if (check_errno && mips_a3) {
2320                 tcp->u_rval = -1;
2321                 u_error = mips_r2;
2322         } else {
2323                 tcp->u_rval = mips_r2;
2324 # if defined(LINUX_MIPSN32)
2325                 tcp->u_lrval = mips_r2;
2326 # endif
2327         }
2328 #elif defined(POWERPC)
2329         if (check_errno && (ppc_regs.ccr & 0x10000000)) {
2330                 tcp->u_rval = -1;
2331                 u_error = ppc_regs.gpr[3];
2332         }
2333         else {
2334                 tcp->u_rval = ppc_regs.gpr[3];
2335         }
2336 #elif defined(M68K)
2337         if (check_errno && is_negated_errno(m68k_d0)) {
2338                 tcp->u_rval = -1;
2339                 u_error = -m68k_d0;
2340         }
2341         else {
2342                 tcp->u_rval = m68k_d0;
2343         }
2344 #elif defined(ARM) || defined(AARCH64)
2345 # if defined(AARCH64)
2346         if (tcp->currpers == 1) {
2347                 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) {
2348                         tcp->u_rval = -1;
2349                         u_error = -aarch64_regs.regs[0];
2350                 }
2351                 else {
2352                         tcp->u_rval = aarch64_regs.regs[0];
2353                 }
2354         }
2355         else
2356 # endif
2357         {
2358                 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) {
2359                         tcp->u_rval = -1;
2360                         u_error = -arm_regs.ARM_r0;
2361                 }
2362                 else {
2363                         tcp->u_rval = arm_regs.ARM_r0;
2364                 }
2365         }
2366 #elif defined(AVR32)
2367         if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) {
2368                 tcp->u_rval = -1;
2369                 u_error = -avr32_regs.r12;
2370         }
2371         else {
2372                 tcp->u_rval = avr32_regs.r12;
2373         }
2374 #elif defined(BFIN)
2375         if (check_errno && is_negated_errno(bfin_r0)) {
2376                 tcp->u_rval = -1;
2377                 u_error = -bfin_r0;
2378         } else {
2379                 tcp->u_rval = bfin_r0;
2380         }
2381 #elif defined(ALPHA)
2382         if (check_errno && alpha_a3) {
2383                 tcp->u_rval = -1;
2384                 u_error = alpha_r0;
2385         }
2386         else {
2387                 tcp->u_rval = alpha_r0;
2388         }
2389 #elif defined(SPARC)
2390         if (check_errno && sparc_regs.psr & PSR_C) {
2391                 tcp->u_rval = -1;
2392                 u_error = sparc_regs.u_regs[U_REG_O0];
2393         }
2394         else {
2395                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2396         }
2397 #elif defined(SPARC64)
2398         if (check_errno && sparc_regs.tstate & 0x1100000000UL) {
2399                 tcp->u_rval = -1;
2400                 u_error = sparc_regs.u_regs[U_REG_O0];
2401         }
2402         else {
2403                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2404         }
2405 #elif defined(HPPA)
2406         if (check_errno && is_negated_errno(hppa_r28)) {
2407                 tcp->u_rval = -1;
2408                 u_error = -hppa_r28;
2409         }
2410         else {
2411                 tcp->u_rval = hppa_r28;
2412         }
2413 #elif defined(SH)
2414         if (check_errno && is_negated_errno(sh_r0)) {
2415                 tcp->u_rval = -1;
2416                 u_error = -sh_r0;
2417         }
2418         else {
2419                 tcp->u_rval = sh_r0;
2420         }
2421 #elif defined(SH64)
2422         if (check_errno && is_negated_errno(sh64_r9)) {
2423                 tcp->u_rval = -1;
2424                 u_error = -sh64_r9;
2425         }
2426         else {
2427                 tcp->u_rval = sh64_r9;
2428         }
2429 #elif defined(METAG)
2430         /* result pointer in D0Re0 (D0.0) */
2431         if (check_errno && is_negated_errno(metag_regs.dx[0][0])) {
2432                 tcp->u_rval = -1;
2433                 u_error = -metag_regs.dx[0][0];
2434         }
2435         else {
2436                 tcp->u_rval = metag_regs.dx[0][0];
2437         }
2438 #elif defined(CRISV10) || defined(CRISV32)
2439         if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) {
2440                 tcp->u_rval = -1;
2441                 u_error = -cris_r10;
2442         }
2443         else {
2444                 tcp->u_rval = cris_r10;
2445         }
2446 #elif defined(TILE)
2447         /*
2448          * The standard tile calling convention returns the value (or negative
2449          * errno) in r0, and zero (or positive errno) in r1.
2450          * Until at least kernel 3.8, however, the r1 value is not reflected
2451          * in ptregs at this point, so we use r0 here.
2452          */
2453         if (check_errno && is_negated_errno(tile_regs.regs[0])) {
2454                 tcp->u_rval = -1;
2455                 u_error = -tile_regs.regs[0];
2456         } else {
2457                 tcp->u_rval = tile_regs.regs[0];
2458         }
2459 #elif defined(MICROBLAZE)
2460         if (check_errno && is_negated_errno(microblaze_r3)) {
2461                 tcp->u_rval = -1;
2462                 u_error = -microblaze_r3;
2463         }
2464         else {
2465                 tcp->u_rval = microblaze_r3;
2466         }
2467 #elif defined(OR1K)
2468         if (check_errno && is_negated_errno(or1k_regs.gpr[11])) {
2469                 tcp->u_rval = -1;
2470                 u_error = -or1k_regs.gpr[11];
2471         }
2472         else {
2473                 tcp->u_rval = or1k_regs.gpr[11];
2474         }
2475 #elif defined(XTENSA)
2476         if (check_errno && is_negated_errno(xtensa_a2)) {
2477                 tcp->u_rval = -1;
2478                 u_error = -xtensa_a2;
2479         }
2480         else {
2481                 tcp->u_rval = xtensa_a2;
2482         }
2483 #elif defined(ARC)
2484         if (check_errno && is_negated_errno(arc_regs.scratch.r0)) {
2485                 tcp->u_rval = -1;
2486                 u_error = -arc_regs.scratch.r0;
2487         }
2488         else {
2489                 tcp->u_rval = arc_regs.scratch.r0;
2490         }
2491 #endif
2492         tcp->u_error = u_error;
2493 }
2494
2495 static void
2496 dumpio(struct tcb *tcp)
2497 {
2498         int (*func)();
2499
2500         if (syserror(tcp))
2501                 return;
2502         if ((unsigned long) tcp->u_arg[0] >= num_quals)
2503                 return;
2504         func = tcp->s_ent->sys_func;
2505         if (func == printargs)
2506                 return;
2507         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
2508                 if (func == sys_read ||
2509                     func == sys_pread ||
2510                     func == sys_recv ||
2511                     func == sys_recvfrom) {
2512                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
2513                         return;
2514                 } else if (func == sys_readv) {
2515                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2516                         return;
2517 #if HAVE_SENDMSG
2518                 } else if (func == sys_recvmsg) {
2519                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2520                         return;
2521                 } else if (func == sys_recvmmsg) {
2522                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2523                         return;
2524 #endif
2525                 }
2526         }
2527         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
2528                 if (func == sys_write ||
2529                     func == sys_pwrite ||
2530                     func == sys_send ||
2531                     func == sys_sendto)
2532                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
2533                 else if (func == sys_writev)
2534                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2535 #if HAVE_SENDMSG
2536                 else if (func == sys_sendmsg)
2537                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2538                 else if (func == sys_sendmmsg)
2539                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2540 #endif
2541         }
2542 }
2543
2544 static int
2545 trace_syscall_exiting(struct tcb *tcp)
2546 {
2547         int sys_res;
2548         struct timeval tv;
2549         int res;
2550         long u_error;
2551
2552         /* Measure the exit time as early as possible to avoid errors. */
2553         if (Tflag || cflag)
2554                 gettimeofday(&tv, NULL);
2555
2556 #ifdef USE_LIBUNWIND
2557         if (stack_trace_enabled) {
2558                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
2559                         unwind_cache_invalidate(tcp);
2560         }
2561 #endif
2562
2563 #if SUPPORTED_PERSONALITIES > 1
2564         update_personality(tcp, tcp->currpers);
2565 #endif
2566         res = (get_regs_error ? -1 : get_syscall_result(tcp));
2567         if (res == 1) {
2568                 syscall_fixup_on_sysexit(tcp); /* never fails */
2569                 get_error(tcp); /* never fails */
2570                 if (need_fork_exec_workarounds)
2571                         syscall_fixup_for_fork_exec(tcp);
2572                 if (filtered(tcp) || hide_log_until_execve)
2573                         goto ret;
2574         }
2575
2576         if (cflag) {
2577                 count_syscall(tcp, &tv);
2578                 if (cflag == CFLAG_ONLY_STATS) {
2579                         goto ret;
2580                 }
2581         }
2582
2583         /* If not in -ff mode, and printing_tcp != tcp,
2584          * then the log currently does not end with output
2585          * of _our syscall entry_, but with something else.
2586          * We need to say which syscall's return is this.
2587          *
2588          * Forced reprinting via TCB_REPRINT is used only by
2589          * "strace -ff -oLOG test/threaded_execve" corner case.
2590          * It's the only case when -ff mode needs reprinting.
2591          */
2592         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
2593                 tcp->flags &= ~TCB_REPRINT;
2594                 printleader(tcp);
2595                 if (tcp->qual_flg & UNDEFINED_SCNO)
2596                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
2597                 else
2598                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
2599         }
2600         printing_tcp = tcp;
2601
2602         if (res != 1) {
2603                 /* There was error in one of prior ptrace ops */
2604                 tprints(") ");
2605                 tabto();
2606                 tprints("= ? <unavailable>\n");
2607                 line_ended();
2608                 tcp->flags &= ~TCB_INSYSCALL;
2609                 return res;
2610         }
2611
2612         sys_res = 0;
2613         if (tcp->qual_flg & QUAL_RAW) {
2614                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
2615         } else {
2616         /* FIXME: not_failing_only (IOW, option -z) is broken:
2617          * failure of syscall is known only after syscall return.
2618          * Thus we end up with something like this on, say, ENOENT:
2619          *     open("doesnt_exist", O_RDONLY <unfinished ...>
2620          *     {next syscall decode}
2621          * whereas the intended result is that open(...) line
2622          * is not shown at all.
2623          */
2624                 if (not_failing_only && tcp->u_error)
2625                         goto ret;       /* ignore failed syscalls */
2626                 sys_res = tcp->s_ent->sys_func(tcp);
2627         }
2628
2629         tprints(") ");
2630         tabto();
2631         u_error = tcp->u_error;
2632         if (tcp->qual_flg & QUAL_RAW) {
2633                 if (u_error)
2634                         tprintf("= -1 (errno %ld)", u_error);
2635                 else
2636                         tprintf("= %#lx", tcp->u_rval);
2637         }
2638         else if (!(sys_res & RVAL_NONE) && u_error) {
2639                 switch (u_error) {
2640                 /* Blocked signals do not interrupt any syscalls.
2641                  * In this case syscalls don't return ERESTARTfoo codes.
2642                  *
2643                  * Deadly signals set to SIG_DFL interrupt syscalls
2644                  * and kill the process regardless of which of the codes below
2645                  * is returned by the interrupted syscall.
2646                  * In some cases, kernel forces a kernel-generated deadly
2647                  * signal to be unblocked and set to SIG_DFL (and thus cause
2648                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
2649                  * or SIGILL. (The alternative is to leave process spinning
2650                  * forever on the faulty instruction - not useful).
2651                  *
2652                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
2653                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
2654                  * but kernel will always restart them.
2655                  */
2656                 case ERESTARTSYS:
2657                         /* Most common type of signal-interrupted syscall exit code.
2658                          * The system call will be restarted with the same arguments
2659                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
2660                          */
2661                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
2662                         break;
2663                 case ERESTARTNOINTR:
2664                         /* Rare. For example, fork() returns this if interrupted.
2665                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
2666                          */
2667                         tprints("= ? ERESTARTNOINTR (To be restarted)");
2668                         break;
2669                 case ERESTARTNOHAND:
2670                         /* pause(), rt_sigsuspend() etc use this code.
2671                          * SA_RESTART is ignored (assumed not set):
2672                          * syscall won't restart (will return EINTR instead)
2673                          * even after signal with SA_RESTART set. However,
2674                          * after SIG_IGN or SIG_DFL signal it will restart
2675                          * (thus the name "restart only if has no handler").
2676                          */
2677                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
2678                         break;
2679                 case ERESTART_RESTARTBLOCK:
2680                         /* Syscalls like nanosleep(), poll() which can't be
2681                          * restarted with their original arguments use this
2682                          * code. Kernel will execute restart_syscall() instead,
2683                          * which changes arguments before restarting syscall.
2684                          * SA_RESTART is ignored (assumed not set) similarly
2685                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
2686                          * since restart data is saved in "restart block"
2687                          * in task struct, and if signal handler uses a syscall
2688                          * which in turn saves another such restart block,
2689                          * old data is lost and restart becomes impossible)
2690                          */
2691                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
2692                         break;
2693                 default:
2694                         if (u_error < 0)
2695                                 tprintf("= -1 E??? (errno %ld)", u_error);
2696                         else if ((unsigned long) u_error < nerrnos)
2697                                 tprintf("= -1 %s (%s)", errnoent[u_error],
2698                                         strerror(u_error));
2699                         else
2700                                 tprintf("= -1 ERRNO_%ld (%s)", u_error,
2701                                         strerror(u_error));
2702                         break;
2703                 }
2704                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2705                         tprintf(" (%s)", tcp->auxstr);
2706         }
2707         else {
2708                 if (sys_res & RVAL_NONE)
2709                         tprints("= ?");
2710                 else {
2711                         switch (sys_res & RVAL_MASK) {
2712                         case RVAL_HEX:
2713                                 tprintf("= %#lx", tcp->u_rval);
2714                                 break;
2715                         case RVAL_OCTAL:
2716                                 tprintf("= %#lo", tcp->u_rval);
2717                                 break;
2718                         case RVAL_UDECIMAL:
2719                                 tprintf("= %lu", tcp->u_rval);
2720                                 break;
2721                         case RVAL_DECIMAL:
2722                                 tprintf("= %ld", tcp->u_rval);
2723                                 break;
2724                         case RVAL_FD:
2725                                 if (show_fd_path) {
2726                                         tprints("= ");
2727                                         printfd(tcp, tcp->u_rval);
2728                                 }
2729                                 else
2730                                         tprintf("= %ld", tcp->u_rval);
2731                                 break;
2732 #if defined(LINUX_MIPSN32) || defined(X32)
2733                         /*
2734                         case RVAL_LHEX:
2735                                 tprintf("= %#llx", tcp->u_lrval);
2736                                 break;
2737                         case RVAL_LOCTAL:
2738                                 tprintf("= %#llo", tcp->u_lrval);
2739                                 break;
2740                         */
2741                         case RVAL_LUDECIMAL:
2742                                 tprintf("= %llu", tcp->u_lrval);
2743                                 break;
2744                         /*
2745                         case RVAL_LDECIMAL:
2746                                 tprintf("= %lld", tcp->u_lrval);
2747                                 break;
2748                         */
2749 #endif
2750                         default:
2751                                 fprintf(stderr,
2752                                         "invalid rval format\n");
2753                                 break;
2754                         }
2755                 }
2756                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2757                         tprintf(" (%s)", tcp->auxstr);
2758         }
2759         if (Tflag) {
2760                 tv_sub(&tv, &tv, &tcp->etime);
2761                 tprintf(" <%ld.%06ld>",
2762                         (long) tv.tv_sec, (long) tv.tv_usec);
2763         }
2764         tprints("\n");
2765         dumpio(tcp);
2766         line_ended();
2767
2768 #ifdef USE_LIBUNWIND
2769         if (stack_trace_enabled)
2770                 unwind_print_stacktrace(tcp);
2771 #endif
2772
2773  ret:
2774         tcp->flags &= ~TCB_INSYSCALL;
2775         return 0;
2776 }
2777
2778 int
2779 trace_syscall(struct tcb *tcp)
2780 {
2781         return exiting(tcp) ?
2782                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
2783 }