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.h' may be generated from `ioctlent.raw' 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 "ioctlent.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                         scno -= __X32_SYSCALL_BIT;
1268                         currpers = 2;
1269                 }
1270         }
1271 # elif 0
1272         /* cs = 0x33 for long mode (native 64 bit and x32)
1273          * cs = 0x23 for compatibility mode (32 bit)
1274          * ds = 0x2b for x32 mode (x86-64 in 32 bit)
1275          */
1276         scno = x86_64_regs.orig_rax;
1277         switch (x86_64_regs.cs) {
1278                 case 0x23: currpers = 1; break;
1279                 case 0x33:
1280                         if (x86_64_regs.ds == 0x2b) {
1281                                 currpers = 2;
1282                                 scno &= ~__X32_SYSCALL_BIT;
1283                         } else
1284                                 currpers = 0;
1285                         break;
1286                 default:
1287                         fprintf(stderr, "Unknown value CS=0x%08X while "
1288                                  "detecting personality of process "
1289                                  "PID=%d\n", (int)x86_64_regs.cs, tcp->pid);
1290                         currpers = current_personality;
1291                         break;
1292         }
1293 # elif 0
1294         /* This version analyzes the opcode of a syscall instruction.
1295          * (int 0x80 on i386 vs. syscall on x86-64)
1296          * It works, but is too complicated, and strictly speaking, unreliable.
1297          */
1298         unsigned long call, rip = x86_64_regs.rip;
1299         /* sizeof(syscall) == sizeof(int 0x80) == 2 */
1300         rip -= 2;
1301         errno = 0;
1302         call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0);
1303         if (errno)
1304                 fprintf(stderr, "ptrace_peektext failed: %s\n",
1305                                 strerror(errno));
1306         switch (call & 0xffff) {
1307                 /* x86-64: syscall = 0x0f 0x05 */
1308                 case 0x050f: currpers = 0; break;
1309                 /* i386: int 0x80 = 0xcd 0x80 */
1310                 case 0x80cd: currpers = 1; break;
1311                 default:
1312                         currpers = current_personality;
1313                         fprintf(stderr,
1314                                 "Unknown syscall opcode (0x%04X) while "
1315                                 "detecting personality of process "
1316                                 "PID=%d\n", (int)call, tcp->pid);
1317                         break;
1318         }
1319 # endif
1320
1321 # ifdef X32
1322         /* If we are built for a x32 system, then personality 0 is x32
1323          * (not x86_64), and stracing of x86_64 apps is not supported.
1324          * Stracing of i386 apps is still supported.
1325          */
1326         if (currpers == 0) {
1327                 fprintf(stderr, "syscall_%lu(...) in unsupported "
1328                                 "64-bit mode of process PID=%d\n",
1329                         scno, tcp->pid);
1330                 return 0;
1331         }
1332         currpers &= ~2; /* map 2,1 to 0,1 */
1333 # endif
1334         update_personality(tcp, currpers);
1335 #elif defined(IA64)
1336 #       define IA64_PSR_IS      ((long)1 << 34)
1337         long psr;
1338         if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0)
1339                 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0);
1340         if (ia64_ia32mode) {
1341                 if (upeek(tcp->pid, PT_R1, &scno) < 0)
1342                         return -1;
1343         } else {
1344                 if (upeek(tcp->pid, PT_R15, &scno) < 0)
1345                         return -1;
1346         }
1347 #elif defined(AARCH64)
1348         switch (aarch64_io.iov_len) {
1349                 case sizeof(aarch64_regs):
1350                         /* We are in 64-bit mode */
1351                         scno = aarch64_regs.regs[8];
1352                         update_personality(tcp, 1);
1353                         break;
1354                 case sizeof(arm_regs):
1355                         /* We are in 32-bit mode */
1356                         /* Note: we don't support OABI, unlike 32-bit ARM build */
1357                         scno = arm_regs.ARM_r7;
1358                         scno = shuffle_scno(scno);
1359                         update_personality(tcp, 0);
1360                         break;
1361         }
1362 #elif defined(ARM)
1363         if (arm_regs.ARM_ip != 0) {
1364                 /* It is not a syscall entry */
1365                 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
1366                 tcp->flags |= TCB_INSYSCALL;
1367                 return 0;
1368         }
1369         /* Note: we support only 32-bit CPUs, not 26-bit */
1370
1371 # if !defined(__ARM_EABI__) || ENABLE_ARM_OABI
1372         if (arm_regs.ARM_cpsr & 0x20)
1373                 /* Thumb mode */
1374                 goto scno_in_r7;
1375         /* ARM mode */
1376         /* Check EABI/OABI by examining SVC insn's low 24 bits */
1377         errno = 0;
1378         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL);
1379         if (errno)
1380                 return -1;
1381         /* EABI syscall convention? */
1382         if (scno != 0xef000000) {
1383                 /* No, it's OABI */
1384                 if ((scno & 0x0ff00000) != 0x0f900000) {
1385                         fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n",
1386                                 tcp->pid, scno);
1387                         return -1;
1388                 }
1389                 /* Fixup the syscall number */
1390                 scno &= 0x000fffff;
1391         } else {
1392  scno_in_r7:
1393                 scno = arm_regs.ARM_r7;
1394         }
1395 # else /* __ARM_EABI__ || !ENABLE_ARM_OABI */
1396         scno = arm_regs.ARM_r7;
1397 # endif
1398         scno = shuffle_scno(scno);
1399 #elif defined(M68K)
1400         if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0)
1401                 return -1;
1402 #elif defined(LINUX_MIPSN32)
1403         unsigned long long regs[38];
1404
1405         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
1406                 return -1;
1407         mips_a3 = regs[REG_A3];
1408         mips_r2 = regs[REG_V0];
1409
1410         scno = mips_r2;
1411         if (!SCNO_IN_RANGE(scno)) {
1412                 if (mips_a3 == 0 || mips_a3 == -1) {
1413                         if (debug_flag)
1414                                 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
1415                         return 0;
1416                 }
1417         }
1418 #elif defined(MIPS)
1419         if (upeek(tcp->pid, REG_A3, &mips_a3) < 0)
1420                 return -1;
1421         if (upeek(tcp->pid, REG_V0, &scno) < 0)
1422                 return -1;
1423
1424         if (!SCNO_IN_RANGE(scno)) {
1425                 if (mips_a3 == 0 || mips_a3 == -1) {
1426                         if (debug_flag)
1427                                 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
1428                         return 0;
1429                 }
1430         }
1431 #elif defined(ALPHA)
1432         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
1433                 return -1;
1434         if (upeek(tcp->pid, REG_R0, &scno) < 0)
1435                 return -1;
1436
1437         /*
1438          * Do some sanity checks to figure out if it's
1439          * really a syscall entry
1440          */
1441         if (!SCNO_IN_RANGE(scno)) {
1442                 if (alpha_a3 == 0 || alpha_a3 == -1) {
1443                         if (debug_flag)
1444                                 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno);
1445                         return 0;
1446                 }
1447         }
1448 #elif defined(SPARC) || defined(SPARC64)
1449         /* Disassemble the syscall trap. */
1450         /* Retrieve the syscall trap instruction. */
1451         unsigned long trap;
1452         errno = 0;
1453 # if defined(SPARC64)
1454         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0);
1455         trap >>= 32;
1456 # else
1457         trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0);
1458 # endif
1459         if (errno)
1460                 return -1;
1461
1462         /* Disassemble the trap to see what personality to use. */
1463         switch (trap) {
1464         case 0x91d02010:
1465                 /* Linux/SPARC syscall trap. */
1466                 update_personality(tcp, 0);
1467                 break;
1468         case 0x91d0206d:
1469                 /* Linux/SPARC64 syscall trap. */
1470                 update_personality(tcp, 2);
1471                 break;
1472         case 0x91d02000:
1473                 /* SunOS syscall trap. (pers 1) */
1474                 fprintf(stderr, "syscall: SunOS no support\n");
1475                 return -1;
1476         case 0x91d02008:
1477                 /* Solaris 2.x syscall trap. (per 2) */
1478                 update_personality(tcp, 1);
1479                 break;
1480         case 0x91d02009:
1481                 /* NetBSD/FreeBSD syscall trap. */
1482                 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n");
1483                 return -1;
1484         case 0x91d02027:
1485                 /* Solaris 2.x gettimeofday */
1486                 update_personality(tcp, 1);
1487                 break;
1488         default:
1489 # if defined(SPARC64)
1490                 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc);
1491 # else
1492                 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc);
1493 # endif
1494                 return -1;
1495         }
1496
1497         /* Extract the system call number from the registers. */
1498         if (trap == 0x91d02027)
1499                 scno = 156;
1500         else
1501                 scno = sparc_regs.u_regs[U_REG_G1];
1502         if (scno == 0) {
1503                 scno = sparc_regs.u_regs[U_REG_O0];
1504                 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0]));
1505         }
1506 #elif defined(HPPA)
1507         if (upeek(tcp->pid, PT_GR20, &scno) < 0)
1508                 return -1;
1509 #elif defined(SH)
1510         /*
1511          * In the new syscall ABI, the system call number is in R3.
1512          */
1513         if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0)
1514                 return -1;
1515
1516         if (scno < 0) {
1517                 /* Odd as it may seem, a glibc bug has been known to cause
1518                    glibc to issue bogus negative syscall numbers.  So for
1519                    our purposes, make strace print what it *should* have been */
1520                 long correct_scno = (scno & 0xff);
1521                 if (debug_flag)
1522                         fprintf(stderr,
1523                                 "Detected glibc bug: bogus system call"
1524                                 " number = %ld, correcting to %ld\n",
1525                                 scno,
1526                                 correct_scno);
1527                 scno = correct_scno;
1528         }
1529 #elif defined(SH64)
1530         if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0)
1531                 return -1;
1532         scno &= 0xFFFF;
1533 #elif defined(CRISV10) || defined(CRISV32)
1534         if (upeek(tcp->pid, 4*PT_R9, &scno) < 0)
1535                 return -1;
1536 #elif defined(TILE)
1537         unsigned int currpers;
1538         scno = tile_regs.regs[10];
1539 # ifdef __tilepro__
1540         currpers = 1;
1541 # else
1542 #  ifndef PT_FLAGS_COMPAT
1543 #   define PT_FLAGS_COMPAT 0x10000  /* from Linux 3.8 on */
1544 #  endif
1545         if (tile_regs.flags & PT_FLAGS_COMPAT)
1546                 currpers = 1;
1547         else
1548                 currpers = 0;
1549 # endif
1550         update_personality(tcp, currpers);
1551 #elif defined(MICROBLAZE)
1552         if (upeek(tcp->pid, 0, &scno) < 0)
1553                 return -1;
1554 #elif defined(OR1K)
1555         scno = or1k_regs.gpr[11];
1556 #elif defined(METAG)
1557         scno = metag_regs.dx[0][1];     /* syscall number in D1Re0 (D1.0) */
1558 #elif defined(XTENSA)
1559         if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0)
1560                 return -1;
1561 # elif defined(ARC)
1562         scno = arc_regs.scratch.r8;
1563 #endif
1564
1565         tcp->scno = scno;
1566         if (SCNO_IS_VALID(tcp->scno)) {
1567                 tcp->s_ent = &sysent[scno];
1568                 tcp->qual_flg = qual_flags[scno];
1569         } else {
1570                 static const struct_sysent unknown = {
1571                         .nargs = MAX_ARGS,
1572                         .sys_flags = 0,
1573                         .sys_func = printargs,
1574                         .sys_name = "unknown", /* not used */
1575                 };
1576                 tcp->s_ent = &unknown;
1577                 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
1578         }
1579         return 1;
1580 }
1581
1582 /* Called at each syscall entry.
1583  * Returns:
1584  * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
1585  * 1: ok, continue in trace_syscall_entering().
1586  * other: error, trace_syscall_entering() should print error indicator
1587  *    ("????" etc) and bail out.
1588  */
1589 static int
1590 syscall_fixup_on_sysenter(struct tcb *tcp)
1591 {
1592         /* A common case of "not a syscall entry" is post-execve SIGTRAP */
1593 #if defined(I386)
1594         if (i386_regs.eax != -ENOSYS) {
1595                 if (debug_flag)
1596                         fprintf(stderr, "not a syscall entry (eax = %ld)\n", i386_regs.eax);
1597                 return 0;
1598         }
1599 #elif defined(X86_64) || defined(X32)
1600         {
1601                 long rax;
1602                 if (x86_io.iov_len == sizeof(i386_regs)) {
1603                         /* Sign extend from 32 bits */
1604                         rax = (int32_t)i386_regs.eax;
1605                 } else {
1606                         /* Note: in X32 build, this truncates 64 to 32 bits */
1607                         rax = x86_64_regs.rax;
1608                 }
1609                 if (rax != -ENOSYS) {
1610                         if (debug_flag)
1611                                 fprintf(stderr, "not a syscall entry (rax = %ld)\n", rax);
1612                         return 0;
1613                 }
1614         }
1615 #elif defined(M68K)
1616         /* TODO? Eliminate upeek's in arches below like we did in x86 */
1617         if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0)
1618                 return -1;
1619         if (m68k_d0 != -ENOSYS) {
1620                 if (debug_flag)
1621                         fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0);
1622                 return 0;
1623         }
1624 #elif defined(IA64)
1625         if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0)
1626                 return -1;
1627         if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0)
1628                 return -1;
1629         if (ia64_ia32mode && ia64_r8 != -ENOSYS) {
1630                 if (debug_flag)
1631                         fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8);
1632                 return 0;
1633         }
1634 #elif defined(CRISV10) || defined(CRISV32)
1635         if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0)
1636                 return -1;
1637         if (cris_r10 != -ENOSYS) {
1638                 if (debug_flag)
1639                         fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10);
1640                 return 0;
1641         }
1642 #elif defined(MICROBLAZE)
1643         if (upeek(tcp->pid, 3 * 4, &microblaze_r3) < 0)
1644                 return -1;
1645         if (microblaze_r3 != -ENOSYS) {
1646                 if (debug_flag)
1647                         fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3);
1648                 return 0;
1649         }
1650 #endif
1651         return 1;
1652 }
1653
1654 static void
1655 internal_fork(struct tcb *tcp)
1656 {
1657 #if defined S390 || defined S390X || defined CRISV10 || defined CRISV32
1658 # define ARG_FLAGS      1
1659 #else
1660 # define ARG_FLAGS      0
1661 #endif
1662 #ifndef CLONE_UNTRACED
1663 # define CLONE_UNTRACED 0x00800000
1664 #endif
1665         if ((ptrace_setoptions
1666             & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
1667            == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
1668                 return;
1669
1670         if (!followfork)
1671                 return;
1672
1673         if (entering(tcp)) {
1674                 /*
1675                  * We won't see the new child if clone is called with
1676                  * CLONE_UNTRACED, so we keep the same logic with that option
1677                  * and don't trace it.
1678                  */
1679                 if ((tcp->s_ent->sys_func == sys_clone)
1680                  && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED)
1681                 )
1682                         return;
1683                 setbpt(tcp);
1684         } else {
1685                 if (tcp->flags & TCB_BPTSET)
1686                         clearbpt(tcp);
1687         }
1688 }
1689
1690 #if defined(TCB_WAITEXECVE)
1691 static void
1692 internal_exec(struct tcb *tcp)
1693 {
1694         /* Maybe we have post-execve SIGTRAP suppressed? */
1695         if (ptrace_setoptions & PTRACE_O_TRACEEXEC)
1696                 return; /* yes, no need to do anything */
1697
1698         if (exiting(tcp) && syserror(tcp))
1699                 /* Error in execve, no post-execve SIGTRAP expected */
1700                 tcp->flags &= ~TCB_WAITEXECVE;
1701         else
1702                 tcp->flags |= TCB_WAITEXECVE;
1703 }
1704 #endif
1705
1706 static void
1707 syscall_fixup_for_fork_exec(struct tcb *tcp)
1708 {
1709         /*
1710          * We must always trace a few critical system calls in order to
1711          * correctly support following forks in the presence of tracing
1712          * qualifiers.
1713          */
1714         int (*func)();
1715
1716         func = tcp->s_ent->sys_func;
1717
1718         if (   sys_fork == func
1719             || sys_clone == func
1720            ) {
1721                 internal_fork(tcp);
1722                 return;
1723         }
1724
1725 #if defined(TCB_WAITEXECVE)
1726         if (   sys_execve == func
1727 # if defined(SPARC) || defined(SPARC64)
1728             || sys_execv == func
1729 # endif
1730            ) {
1731                 internal_exec(tcp);
1732                 return;
1733         }
1734 #endif
1735 }
1736
1737 /* Return -1 on error or 1 on success (never 0!) */
1738 static int
1739 get_syscall_args(struct tcb *tcp)
1740 {
1741         int i, nargs;
1742
1743         nargs = tcp->s_ent->nargs;
1744
1745 #if defined(S390) || defined(S390X)
1746         for (i = 0; i < nargs; ++i)
1747                 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0)
1748                         return -1;
1749 #elif defined(ALPHA)
1750         for (i = 0; i < nargs; ++i)
1751                 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1752                         return -1;
1753 #elif defined(IA64)
1754         if (!ia64_ia32mode) {
1755                 unsigned long *out0, cfm, sof, sol;
1756                 long rbs_end;
1757                 /* be backwards compatible with kernel < 2.4.4... */
1758 #               ifndef PT_RBS_END
1759 #                 define PT_RBS_END     PT_AR_BSP
1760 #               endif
1761
1762                 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0)
1763                         return -1;
1764                 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0)
1765                         return -1;
1766
1767                 sof = (cfm >> 0) & 0x7f;
1768                 sol = (cfm >> 7) & 0x7f;
1769                 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol);
1770
1771                 for (i = 0; i < nargs; ++i) {
1772                         if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1773                                    sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1774                                 return -1;
1775                 }
1776         } else {
1777                 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */,
1778                                                       PT_R9  /* ECX = out1 */,
1779                                                       PT_R10 /* EDX = out2 */,
1780                                                       PT_R14 /* ESI = out3 */,
1781                                                       PT_R15 /* EDI = out4 */,
1782                                                       PT_R13 /* EBP = out5 */};
1783
1784                 for (i = 0; i < nargs; ++i) {
1785                         if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0)
1786                                 return -1;
1787                         /* truncate away IVE sign-extension */
1788                         tcp->u_arg[i] &= 0xffffffff;
1789                 }
1790         }
1791 #elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64)
1792         /* N32 and N64 both use up to six registers.  */
1793         unsigned long long regs[38];
1794
1795         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
1796                 return -1;
1797
1798         for (i = 0; i < nargs; ++i) {
1799                 tcp->u_arg[i] = regs[REG_A0 + i];
1800 # if defined(LINUX_MIPSN32)
1801                 tcp->ext_arg[i] = regs[REG_A0 + i];
1802 # endif
1803         }
1804 #elif defined(MIPS)
1805         if (nargs > 4) {
1806                 long sp;
1807
1808                 if (upeek(tcp->pid, REG_SP, &sp) < 0)
1809                         return -1;
1810                 for (i = 0; i < 4; ++i)
1811                         if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1812                                 return -1;
1813                 umoven(tcp, sp + 16, (nargs - 4) * sizeof(tcp->u_arg[0]),
1814                        (char *)(tcp->u_arg + 4));
1815         } else {
1816                 for (i = 0; i < nargs; ++i)
1817                         if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1818                                 return -1;
1819         }
1820 #elif defined(POWERPC)
1821         (void)i;
1822         (void)nargs;
1823         tcp->u_arg[0] = ppc_regs.orig_gpr3;
1824         tcp->u_arg[1] = ppc_regs.gpr[4];
1825         tcp->u_arg[2] = ppc_regs.gpr[5];
1826         tcp->u_arg[3] = ppc_regs.gpr[6];
1827         tcp->u_arg[4] = ppc_regs.gpr[7];
1828         tcp->u_arg[5] = ppc_regs.gpr[8];
1829 #elif defined(SPARC) || defined(SPARC64)
1830         for (i = 0; i < nargs; ++i)
1831                 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i];
1832 #elif defined(HPPA)
1833         for (i = 0; i < nargs; ++i)
1834                 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1835                         return -1;
1836 #elif defined(ARM) || defined(AARCH64)
1837 # if defined(AARCH64)
1838         if (tcp->currpers == 1)
1839                 for (i = 0; i < nargs; ++i)
1840                         tcp->u_arg[i] = aarch64_regs.regs[i];
1841         else
1842 # endif
1843         for (i = 0; i < nargs; ++i)
1844                 tcp->u_arg[i] = arm_regs.uregs[i];
1845 #elif defined(AVR32)
1846         (void)i;
1847         (void)nargs;
1848         tcp->u_arg[0] = avr32_regs.r12;
1849         tcp->u_arg[1] = avr32_regs.r11;
1850         tcp->u_arg[2] = avr32_regs.r10;
1851         tcp->u_arg[3] = avr32_regs.r9;
1852         tcp->u_arg[4] = avr32_regs.r5;
1853         tcp->u_arg[5] = avr32_regs.r3;
1854 #elif defined(BFIN)
1855         static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 };
1856
1857         for (i = 0; i < nargs; ++i)
1858                 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0)
1859                         return -1;
1860 #elif defined(SH)
1861         static const int syscall_regs[MAX_ARGS] = {
1862                 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6),
1863                 4 * (REG_REG0+7), 4 * (REG_REG0  ), 4 * (REG_REG0+1)
1864         };
1865
1866         for (i = 0; i < nargs; ++i)
1867                 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0)
1868                         return -1;
1869 #elif defined(SH64)
1870         int i;
1871         /* Registers used by SH5 Linux system calls for parameters */
1872         static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 };
1873
1874         for (i = 0; i < nargs; ++i)
1875                 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
1876                         return -1;
1877 #elif defined(I386)
1878         (void)i;
1879         (void)nargs;
1880         tcp->u_arg[0] = i386_regs.ebx;
1881         tcp->u_arg[1] = i386_regs.ecx;
1882         tcp->u_arg[2] = i386_regs.edx;
1883         tcp->u_arg[3] = i386_regs.esi;
1884         tcp->u_arg[4] = i386_regs.edi;
1885         tcp->u_arg[5] = i386_regs.ebp;
1886 #elif defined(X86_64) || defined(X32)
1887         (void)i;
1888         (void)nargs;
1889         if (x86_io.iov_len != sizeof(i386_regs)) {
1890                 /* x86-64 or x32 ABI */
1891                 tcp->u_arg[0] = x86_64_regs.rdi;
1892                 tcp->u_arg[1] = x86_64_regs.rsi;
1893                 tcp->u_arg[2] = x86_64_regs.rdx;
1894                 tcp->u_arg[3] = x86_64_regs.r10;
1895                 tcp->u_arg[4] = x86_64_regs.r8;
1896                 tcp->u_arg[5] = x86_64_regs.r9;
1897 #  ifdef X32
1898                 tcp->ext_arg[0] = x86_64_regs.rdi;
1899                 tcp->ext_arg[1] = x86_64_regs.rsi;
1900                 tcp->ext_arg[2] = x86_64_regs.rdx;
1901                 tcp->ext_arg[3] = x86_64_regs.r10;
1902                 tcp->ext_arg[4] = x86_64_regs.r8;
1903                 tcp->ext_arg[5] = x86_64_regs.r9;
1904 #  endif
1905         } else {
1906                 /* i386 ABI */
1907                 /* Zero-extend from 32 bits */
1908                 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers
1909                  * if you need to use *sign-extended* parameter.
1910                  */
1911                 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx;
1912                 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx;
1913                 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx;
1914                 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi;
1915                 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi;
1916                 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp;
1917         }
1918 #elif defined(MICROBLAZE)
1919         for (i = 0; i < nargs; ++i)
1920                 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0)
1921                         return -1;
1922 #elif defined(CRISV10) || defined(CRISV32)
1923         static const int crisregs[MAX_ARGS] = {
1924                 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12,
1925                 4*PT_R13     , 4*PT_MOF, 4*PT_SRP
1926         };
1927
1928         for (i = 0; i < nargs; ++i)
1929                 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0)
1930                         return -1;
1931 #elif defined(TILE)
1932         for (i = 0; i < nargs; ++i)
1933                 tcp->u_arg[i] = tile_regs.regs[i];
1934 #elif defined(M68K)
1935         for (i = 0; i < nargs; ++i)
1936                 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0)
1937                         return -1;
1938 #elif defined(OR1K)
1939         (void)nargs;
1940         for (i = 0; i < 6; ++i)
1941                 tcp->u_arg[i] = or1k_regs.gpr[3 + i];
1942 #elif defined(METAG)
1943         for (i = 0; i < nargs; i++)
1944                 /* arguments go backwards from D1Ar1 (D1.3) */
1945                 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i];
1946 #elif defined(XTENSA)
1947         /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */
1948         static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 };
1949         for (i = 0; i < nargs; ++i)
1950                 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0)
1951                         return -1;
1952 # elif defined(ARC)
1953         long *arc_args = &arc_regs.scratch.r0;
1954         for (i = 0; i < nargs; ++i)
1955                 tcp->u_arg[i] = *arc_args--;
1956
1957 #else /* Other architecture (32bits specific) */
1958         for (i = 0; i < nargs; ++i)
1959                 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0)
1960                         return -1;
1961 #endif
1962         return 1;
1963 }
1964
1965 static int
1966 trace_syscall_entering(struct tcb *tcp)
1967 {
1968         int res, scno_good;
1969
1970 #if defined TCB_WAITEXECVE
1971         if (tcp->flags & TCB_WAITEXECVE) {
1972                 /* This is the post-execve SIGTRAP. */
1973                 tcp->flags &= ~TCB_WAITEXECVE;
1974                 return 0;
1975         }
1976 #endif
1977
1978         scno_good = res = (get_regs_error ? -1 : get_scno(tcp));
1979         if (res == 0)
1980                 return res;
1981         if (res == 1) {
1982                 res = syscall_fixup_on_sysenter(tcp);
1983                 if (res == 0)
1984                         return res;
1985                 if (res == 1)
1986                         res = get_syscall_args(tcp);
1987         }
1988
1989         if (res != 1) {
1990                 printleader(tcp);
1991                 if (scno_good != 1)
1992                         tprints("????" /* anti-trigraph gap */ "(");
1993                 else if (tcp->qual_flg & UNDEFINED_SCNO)
1994                         tprintf("%s(", undefined_scno_name(tcp));
1995                 else
1996                         tprintf("%s(", tcp->s_ent->sys_name);
1997                 /*
1998                  * " <unavailable>" will be added later by the code which
1999                  * detects ptrace errors.
2000                  */
2001                 goto ret;
2002         }
2003
2004         if (   sys_execve == tcp->s_ent->sys_func
2005 # if defined(SPARC) || defined(SPARC64)
2006             || sys_execv == tcp->s_ent->sys_func
2007 # endif
2008            ) {
2009                 hide_log_until_execve = 0;
2010         }
2011
2012 #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
2013         while (1) {
2014 # ifdef SYS_socket_subcall
2015                 if (tcp->s_ent->sys_func == sys_socketcall) {
2016                         decode_socket_subcall(tcp);
2017                         break;
2018                 }
2019 # endif
2020 # ifdef SYS_ipc_subcall
2021                 if (tcp->s_ent->sys_func == sys_ipc) {
2022                         decode_ipc_subcall(tcp);
2023                         break;
2024                 }
2025 # endif
2026                 break;
2027         }
2028 #endif
2029
2030         if (need_fork_exec_workarounds)
2031                 syscall_fixup_for_fork_exec(tcp);
2032
2033         if (!(tcp->qual_flg & QUAL_TRACE)
2034          || (tracing_paths && !pathtrace_match(tcp))
2035         ) {
2036                 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
2037                 return 0;
2038         }
2039
2040         tcp->flags &= ~TCB_FILTERED;
2041
2042         if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
2043                 res = 0;
2044                 goto ret;
2045         }
2046
2047 #ifdef USE_LIBUNWIND
2048         if (stack_trace_enabled) {
2049                 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
2050                         unwind_capture_stacktrace(tcp);
2051         }
2052 #endif
2053
2054         printleader(tcp);
2055         if (tcp->qual_flg & UNDEFINED_SCNO)
2056                 tprintf("%s(", undefined_scno_name(tcp));
2057         else
2058                 tprintf("%s(", tcp->s_ent->sys_name);
2059         if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
2060                 res = printargs(tcp);
2061         else
2062                 res = tcp->s_ent->sys_func(tcp);
2063
2064         fflush(tcp->outf);
2065  ret:
2066         tcp->flags |= TCB_INSYSCALL;
2067         /* Measure the entrance time as late as possible to avoid errors. */
2068         if (Tflag || cflag)
2069                 gettimeofday(&tcp->etime, NULL);
2070         return res;
2071 }
2072
2073 /* Returns:
2074  * 1: ok, continue in trace_syscall_exiting().
2075  * -1: error, trace_syscall_exiting() should print error indicator
2076  *    ("????" etc) and bail out.
2077  */
2078 static int
2079 get_syscall_result(struct tcb *tcp)
2080 {
2081 #if defined(S390) || defined(S390X)
2082         if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0)
2083                 return -1;
2084 #elif defined(POWERPC)
2085         /* already done by get_regs */
2086 #elif defined(AVR32)
2087         /* already done by get_regs */
2088 #elif defined(BFIN)
2089         if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0)
2090                 return -1;
2091 #elif defined(I386)
2092         /* already done by get_regs */
2093 #elif defined(X86_64) || defined(X32)
2094         /* already done by get_regs */
2095 #elif defined(IA64)
2096 #       define IA64_PSR_IS      ((long)1 << 34)
2097         long psr;
2098         if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0)
2099                 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0);
2100         if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0)
2101                 return -1;
2102         if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0)
2103                 return -1;
2104 #elif defined(ARM)
2105         /* already done by get_regs */
2106 #elif defined(AARCH64)
2107         /* register reading already done by get_regs */
2108
2109         /* Used to do this, but we did it on syscall entry already: */
2110         /* We are in 64-bit mode (personality 1) if register struct is aarch64_regs,
2111          * else it's personality 0.
2112          */
2113         /*update_personality(tcp, aarch64_io.iov_len == sizeof(aarch64_regs));*/
2114 #elif defined(M68K)
2115         if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0)
2116                 return -1;
2117 #elif defined(LINUX_MIPSN32)
2118         unsigned long long regs[38];
2119
2120         if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
2121                 return -1;
2122         mips_a3 = regs[REG_A3];
2123         mips_r2 = regs[REG_V0];
2124 #elif defined(MIPS)
2125         if (upeek(tcp->pid, REG_A3, &mips_a3) < 0)
2126                 return -1;
2127         if (upeek(tcp->pid, REG_V0, &mips_r2) < 0)
2128                 return -1;
2129 #elif defined(ALPHA)
2130         if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0)
2131                 return -1;
2132         if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0)
2133                 return -1;
2134 #elif defined(SPARC) || defined(SPARC64)
2135         /* already done by get_regs */
2136 #elif defined(HPPA)
2137         if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0)
2138                 return -1;
2139 #elif defined(SH)
2140         /* new syscall ABI returns result in R0 */
2141         if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0)
2142                 return -1;
2143 #elif defined(SH64)
2144         /* ABI defines result returned in r9 */
2145         if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0)
2146                 return -1;
2147 #elif defined(CRISV10) || defined(CRISV32)
2148         if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0)
2149                 return -1;
2150 #elif defined(TILE)
2151         /* already done by get_regs */
2152 #elif defined(MICROBLAZE)
2153         if (upeek(tcp->pid, 3 * 4, &microblaze_r3) < 0)
2154                 return -1;
2155 #elif defined(OR1K)
2156         /* already done by get_regs */
2157 #elif defined(METAG)
2158         /* already done by get_regs */
2159 #elif defined(XTENSA)
2160         if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0)
2161                 return -1;
2162 #elif defined(ARC)
2163         /* already done by get_regs */
2164 #endif
2165         return 1;
2166 }
2167
2168 /* Called at each syscall exit */
2169 static void
2170 syscall_fixup_on_sysexit(struct tcb *tcp)
2171 {
2172 #if defined(S390) || defined(S390X)
2173         if ((tcp->flags & TCB_WAITEXECVE)
2174                  && (s390_gpr2 == -ENOSYS || s390_gpr2 == tcp->scno)) {
2175                 /*
2176                  * Return from execve.
2177                  * Fake a return value of zero.  We leave the TCB_WAITEXECVE
2178                  * flag set for the post-execve SIGTRAP to see and reset.
2179                  */
2180                 s390_gpr2 = 0;
2181         }
2182 #endif
2183 }
2184
2185 /*
2186  * Check the syscall return value register value for whether it is
2187  * a negated errno code indicating an error, or a success return value.
2188  */
2189 static inline int
2190 is_negated_errno(unsigned long int val)
2191 {
2192         unsigned long int max = -(long int) nerrnos;
2193 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
2194         if (current_wordsize < sizeof(val)) {
2195                 val = (unsigned int) val;
2196                 max = (unsigned int) max;
2197         }
2198 #endif
2199         return val > max;
2200 }
2201
2202 #if defined(X32)
2203 static inline int
2204 is_negated_errno_x32(unsigned long long val)
2205 {
2206         unsigned long long max = -(long long) nerrnos;
2207         /*
2208          * current_wordsize is 4 even in personality 0 (native X32)
2209          * but truncation _must not_ be done in it.
2210          * can't check current_wordsize here!
2211          */
2212         if (current_personality != 0) {
2213                 val = (uint32_t) val;
2214                 max = (uint32_t) max;
2215         }
2216         return val > max;
2217 }
2218 #endif
2219
2220 /* Returns:
2221  * 1: ok, continue in trace_syscall_exiting().
2222  * -1: error, trace_syscall_exiting() should print error indicator
2223  *    ("????" etc) and bail out.
2224  */
2225 static void
2226 get_error(struct tcb *tcp)
2227 {
2228         int u_error = 0;
2229         int check_errno = 1;
2230         if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) {
2231                 check_errno = 0;
2232         }
2233 #if defined(S390) || defined(S390X)
2234         if (check_errno && is_negated_errno(s390_gpr2)) {
2235                 tcp->u_rval = -1;
2236                 u_error = -s390_gpr2;
2237         }
2238         else {
2239                 tcp->u_rval = s390_gpr2;
2240         }
2241 #elif defined(I386)
2242         if (check_errno && is_negated_errno(i386_regs.eax)) {
2243                 tcp->u_rval = -1;
2244                 u_error = -i386_regs.eax;
2245         }
2246         else {
2247                 tcp->u_rval = i386_regs.eax;
2248         }
2249 #elif defined(X86_64)
2250         long rax;
2251         if (x86_io.iov_len == sizeof(i386_regs)) {
2252                 /* Sign extend from 32 bits */
2253                 rax = (int32_t)i386_regs.eax;
2254         } else {
2255                 rax = x86_64_regs.rax;
2256         }
2257         if (check_errno && is_negated_errno(rax)) {
2258                 tcp->u_rval = -1;
2259                 u_error = -rax;
2260         }
2261         else {
2262                 tcp->u_rval = rax;
2263         }
2264 #elif defined(X32)
2265         /* In X32, return value is 64-bit (llseek uses one).
2266          * Using merely "long rax" would not work.
2267          */
2268         long long rax;
2269         if (x86_io.iov_len == sizeof(i386_regs)) {
2270                 /* Sign extend from 32 bits */
2271                 rax = (int32_t)i386_regs.eax;
2272         } else {
2273                 rax = x86_64_regs.rax;
2274         }
2275         /* Careful: is_negated_errno() works only on longs */
2276         if (check_errno && is_negated_errno_x32(rax)) {
2277                 tcp->u_rval = -1;
2278                 u_error = -rax;
2279         }
2280         else {
2281                 tcp->u_rval = rax; /* truncating */
2282                 tcp->u_lrval = rax;
2283         }
2284 #elif defined(IA64)
2285         if (ia64_ia32mode) {
2286                 int err;
2287
2288                 err = (int)ia64_r8;
2289                 if (check_errno && is_negated_errno(err)) {
2290                         tcp->u_rval = -1;
2291                         u_error = -err;
2292                 }
2293                 else {
2294                         tcp->u_rval = err;
2295                 }
2296         } else {
2297                 if (check_errno && ia64_r10) {
2298                         tcp->u_rval = -1;
2299                         u_error = ia64_r8;
2300                 } else {
2301                         tcp->u_rval = ia64_r8;
2302                 }
2303         }
2304 #elif defined(MIPS)
2305         if (check_errno && mips_a3) {
2306                 tcp->u_rval = -1;
2307                 u_error = mips_r2;
2308         } else {
2309                 tcp->u_rval = mips_r2;
2310 # if defined(LINUX_MIPSN32)
2311                 tcp->u_lrval = mips_r2;
2312 # endif
2313         }
2314 #elif defined(POWERPC)
2315         if (check_errno && (ppc_regs.ccr & 0x10000000)) {
2316                 tcp->u_rval = -1;
2317                 u_error = ppc_regs.gpr[3];
2318         }
2319         else {
2320                 tcp->u_rval = ppc_regs.gpr[3];
2321         }
2322 #elif defined(M68K)
2323         if (check_errno && is_negated_errno(m68k_d0)) {
2324                 tcp->u_rval = -1;
2325                 u_error = -m68k_d0;
2326         }
2327         else {
2328                 tcp->u_rval = m68k_d0;
2329         }
2330 #elif defined(ARM) || defined(AARCH64)
2331 # if defined(AARCH64)
2332         if (tcp->currpers == 1) {
2333                 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) {
2334                         tcp->u_rval = -1;
2335                         u_error = -aarch64_regs.regs[0];
2336                 }
2337                 else {
2338                         tcp->u_rval = aarch64_regs.regs[0];
2339                 }
2340         }
2341         else
2342 # endif
2343         {
2344                 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) {
2345                         tcp->u_rval = -1;
2346                         u_error = -arm_regs.ARM_r0;
2347                 }
2348                 else {
2349                         tcp->u_rval = arm_regs.ARM_r0;
2350                 }
2351         }
2352 #elif defined(AVR32)
2353         if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) {
2354                 tcp->u_rval = -1;
2355                 u_error = -avr32_regs.r12;
2356         }
2357         else {
2358                 tcp->u_rval = avr32_regs.r12;
2359         }
2360 #elif defined(BFIN)
2361         if (check_errno && is_negated_errno(bfin_r0)) {
2362                 tcp->u_rval = -1;
2363                 u_error = -bfin_r0;
2364         } else {
2365                 tcp->u_rval = bfin_r0;
2366         }
2367 #elif defined(ALPHA)
2368         if (check_errno && alpha_a3) {
2369                 tcp->u_rval = -1;
2370                 u_error = alpha_r0;
2371         }
2372         else {
2373                 tcp->u_rval = alpha_r0;
2374         }
2375 #elif defined(SPARC)
2376         if (check_errno && sparc_regs.psr & PSR_C) {
2377                 tcp->u_rval = -1;
2378                 u_error = sparc_regs.u_regs[U_REG_O0];
2379         }
2380         else {
2381                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2382         }
2383 #elif defined(SPARC64)
2384         if (check_errno && sparc_regs.tstate & 0x1100000000UL) {
2385                 tcp->u_rval = -1;
2386                 u_error = sparc_regs.u_regs[U_REG_O0];
2387         }
2388         else {
2389                 tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
2390         }
2391 #elif defined(HPPA)
2392         if (check_errno && is_negated_errno(hppa_r28)) {
2393                 tcp->u_rval = -1;
2394                 u_error = -hppa_r28;
2395         }
2396         else {
2397                 tcp->u_rval = hppa_r28;
2398         }
2399 #elif defined(SH)
2400         if (check_errno && is_negated_errno(sh_r0)) {
2401                 tcp->u_rval = -1;
2402                 u_error = -sh_r0;
2403         }
2404         else {
2405                 tcp->u_rval = sh_r0;
2406         }
2407 #elif defined(SH64)
2408         if (check_errno && is_negated_errno(sh64_r9)) {
2409                 tcp->u_rval = -1;
2410                 u_error = -sh64_r9;
2411         }
2412         else {
2413                 tcp->u_rval = sh64_r9;
2414         }
2415 #elif defined(METAG)
2416         /* result pointer in D0Re0 (D0.0) */
2417         if (check_errno && is_negated_errno(metag_regs.dx[0][0])) {
2418                 tcp->u_rval = -1;
2419                 u_error = -metag_regs.dx[0][0];
2420         }
2421         else {
2422                 tcp->u_rval = metag_regs.dx[0][0];
2423         }
2424 #elif defined(CRISV10) || defined(CRISV32)
2425         if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) {
2426                 tcp->u_rval = -1;
2427                 u_error = -cris_r10;
2428         }
2429         else {
2430                 tcp->u_rval = cris_r10;
2431         }
2432 #elif defined(TILE)
2433         /*
2434          * The standard tile calling convention returns the value (or negative
2435          * errno) in r0, and zero (or positive errno) in r1.
2436          * Until at least kernel 3.8, however, the r1 value is not reflected
2437          * in ptregs at this point, so we use r0 here.
2438          */
2439         if (check_errno && is_negated_errno(tile_regs.regs[0])) {
2440                 tcp->u_rval = -1;
2441                 u_error = -tile_regs.regs[0];
2442         } else {
2443                 tcp->u_rval = tile_regs.regs[0];
2444         }
2445 #elif defined(MICROBLAZE)
2446         if (check_errno && is_negated_errno(microblaze_r3)) {
2447                 tcp->u_rval = -1;
2448                 u_error = -microblaze_r3;
2449         }
2450         else {
2451                 tcp->u_rval = microblaze_r3;
2452         }
2453 #elif defined(OR1K)
2454         if (check_errno && is_negated_errno(or1k_regs.gpr[11])) {
2455                 tcp->u_rval = -1;
2456                 u_error = -or1k_regs.gpr[11];
2457         }
2458         else {
2459                 tcp->u_rval = or1k_regs.gpr[11];
2460         }
2461 #elif defined(XTENSA)
2462         if (check_errno && is_negated_errno(xtensa_a2)) {
2463                 tcp->u_rval = -1;
2464                 u_error = -xtensa_a2;
2465         }
2466         else {
2467                 tcp->u_rval = xtensa_a2;
2468         }
2469 #elif defined(ARC)
2470         if (check_errno && is_negated_errno(arc_regs.scratch.r0)) {
2471                 tcp->u_rval = -1;
2472                 u_error = -arc_regs.scratch.r0;
2473         }
2474         else {
2475                 tcp->u_rval = arc_regs.scratch.r0;
2476         }
2477 #endif
2478         tcp->u_error = u_error;
2479 }
2480
2481 static void
2482 dumpio(struct tcb *tcp)
2483 {
2484         int (*func)();
2485
2486         if (syserror(tcp))
2487                 return;
2488         if ((unsigned long) tcp->u_arg[0] >= num_quals)
2489                 return;
2490         func = tcp->s_ent->sys_func;
2491         if (func == printargs)
2492                 return;
2493         if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
2494                 if (func == sys_read ||
2495                     func == sys_pread ||
2496                     func == sys_recv ||
2497                     func == sys_recvfrom)
2498                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
2499                 else if (func == sys_readv)
2500                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2501 #if HAVE_SENDMSG
2502                 else if (func == sys_recvmsg)
2503                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2504                 else if (func == sys_recvmmsg)
2505                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2506 #endif
2507                 return;
2508         }
2509         if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
2510                 if (func == sys_write ||
2511                     func == sys_pwrite ||
2512                     func == sys_send ||
2513                     func == sys_sendto)
2514                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
2515                 else if (func == sys_writev)
2516                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
2517 #if HAVE_SENDMSG
2518                 else if (func == sys_sendmsg)
2519                         dumpiov_in_msghdr(tcp, tcp->u_arg[1]);
2520                 else if (func == sys_sendmmsg)
2521                         dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
2522 #endif
2523                 return;
2524         }
2525 }
2526
2527 static int
2528 trace_syscall_exiting(struct tcb *tcp)
2529 {
2530         int sys_res;
2531         struct timeval tv;
2532         int res;
2533         long u_error;
2534
2535         /* Measure the exit time as early as possible to avoid errors. */
2536         if (Tflag || cflag)
2537                 gettimeofday(&tv, NULL);
2538
2539 #ifdef USE_LIBUNWIND
2540         if (stack_trace_enabled) {
2541                 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE)
2542                         unwind_cache_invalidate(tcp);
2543         }
2544 #endif
2545
2546 #if SUPPORTED_PERSONALITIES > 1
2547         update_personality(tcp, tcp->currpers);
2548 #endif
2549         res = (get_regs_error ? -1 : get_syscall_result(tcp));
2550         if (res == 1) {
2551                 syscall_fixup_on_sysexit(tcp); /* never fails */
2552                 get_error(tcp); /* never fails */
2553                 if (need_fork_exec_workarounds)
2554                         syscall_fixup_for_fork_exec(tcp);
2555                 if (filtered(tcp) || hide_log_until_execve)
2556                         goto ret;
2557         }
2558
2559         if (cflag) {
2560                 count_syscall(tcp, &tv);
2561                 if (cflag == CFLAG_ONLY_STATS) {
2562                         goto ret;
2563                 }
2564         }
2565
2566         /* If not in -ff mode, and printing_tcp != tcp,
2567          * then the log currently does not end with output
2568          * of _our syscall entry_, but with something else.
2569          * We need to say which syscall's return is this.
2570          *
2571          * Forced reprinting via TCB_REPRINT is used only by
2572          * "strace -ff -oLOG test/threaded_execve" corner case.
2573          * It's the only case when -ff mode needs reprinting.
2574          */
2575         if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
2576                 tcp->flags &= ~TCB_REPRINT;
2577                 printleader(tcp);
2578                 if (tcp->qual_flg & UNDEFINED_SCNO)
2579                         tprintf("<... %s resumed> ", undefined_scno_name(tcp));
2580                 else
2581                         tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
2582         }
2583         printing_tcp = tcp;
2584
2585         if (res != 1) {
2586                 /* There was error in one of prior ptrace ops */
2587                 tprints(") ");
2588                 tabto();
2589                 tprints("= ? <unavailable>\n");
2590                 line_ended();
2591                 tcp->flags &= ~TCB_INSYSCALL;
2592                 return res;
2593         }
2594
2595         sys_res = 0;
2596         if (tcp->qual_flg & QUAL_RAW) {
2597                 /* sys_res = printargs(tcp); - but it's nop on sysexit */
2598         } else {
2599         /* FIXME: not_failing_only (IOW, option -z) is broken:
2600          * failure of syscall is known only after syscall return.
2601          * Thus we end up with something like this on, say, ENOENT:
2602          *     open("doesnt_exist", O_RDONLY <unfinished ...>
2603          *     {next syscall decode}
2604          * whereas the intended result is that open(...) line
2605          * is not shown at all.
2606          */
2607                 if (not_failing_only && tcp->u_error)
2608                         goto ret;       /* ignore failed syscalls */
2609                 sys_res = tcp->s_ent->sys_func(tcp);
2610         }
2611
2612         tprints(") ");
2613         tabto();
2614         u_error = tcp->u_error;
2615         if (tcp->qual_flg & QUAL_RAW) {
2616                 if (u_error)
2617                         tprintf("= -1 (errno %ld)", u_error);
2618                 else
2619                         tprintf("= %#lx", tcp->u_rval);
2620         }
2621         else if (!(sys_res & RVAL_NONE) && u_error) {
2622                 switch (u_error) {
2623                 /* Blocked signals do not interrupt any syscalls.
2624                  * In this case syscalls don't return ERESTARTfoo codes.
2625                  *
2626                  * Deadly signals set to SIG_DFL interrupt syscalls
2627                  * and kill the process regardless of which of the codes below
2628                  * is returned by the interrupted syscall.
2629                  * In some cases, kernel forces a kernel-generated deadly
2630                  * signal to be unblocked and set to SIG_DFL (and thus cause
2631                  * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
2632                  * or SIGILL. (The alternative is to leave process spinning
2633                  * forever on the faulty instruction - not useful).
2634                  *
2635                  * SIG_IGNed signals and non-deadly signals set to SIG_DFL
2636                  * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
2637                  * but kernel will always restart them.
2638                  */
2639                 case ERESTARTSYS:
2640                         /* Most common type of signal-interrupted syscall exit code.
2641                          * The system call will be restarted with the same arguments
2642                          * if SA_RESTART is set; otherwise, it will fail with EINTR.
2643                          */
2644                         tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
2645                         break;
2646                 case ERESTARTNOINTR:
2647                         /* Rare. For example, fork() returns this if interrupted.
2648                          * SA_RESTART is ignored (assumed set): the restart is unconditional.
2649                          */
2650                         tprints("= ? ERESTARTNOINTR (To be restarted)");
2651                         break;
2652                 case ERESTARTNOHAND:
2653                         /* pause(), rt_sigsuspend() etc use this code.
2654                          * SA_RESTART is ignored (assumed not set):
2655                          * syscall won't restart (will return EINTR instead)
2656                          * even after signal with SA_RESTART set. However,
2657                          * after SIG_IGN or SIG_DFL signal it will restart
2658                          * (thus the name "restart only if has no handler").
2659                          */
2660                         tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
2661                         break;
2662                 case ERESTART_RESTARTBLOCK:
2663                         /* Syscalls like nanosleep(), poll() which can't be
2664                          * restarted with their original arguments use this
2665                          * code. Kernel will execute restart_syscall() instead,
2666                          * which changes arguments before restarting syscall.
2667                          * SA_RESTART is ignored (assumed not set) similarly
2668                          * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
2669                          * since restart data is saved in "restart block"
2670                          * in task struct, and if signal handler uses a syscall
2671                          * which in turn saves another such restart block,
2672                          * old data is lost and restart becomes impossible)
2673                          */
2674                         tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
2675                         break;
2676                 default:
2677                         if (u_error < 0)
2678                                 tprintf("= -1 E??? (errno %ld)", u_error);
2679                         else if ((unsigned long) u_error < nerrnos)
2680                                 tprintf("= -1 %s (%s)", errnoent[u_error],
2681                                         strerror(u_error));
2682                         else
2683                                 tprintf("= -1 ERRNO_%ld (%s)", u_error,
2684                                         strerror(u_error));
2685                         break;
2686                 }
2687                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2688                         tprintf(" (%s)", tcp->auxstr);
2689         }
2690         else {
2691                 if (sys_res & RVAL_NONE)
2692                         tprints("= ?");
2693                 else {
2694                         switch (sys_res & RVAL_MASK) {
2695                         case RVAL_HEX:
2696                                 tprintf("= %#lx", tcp->u_rval);
2697                                 break;
2698                         case RVAL_OCTAL:
2699                                 tprintf("= %#lo", tcp->u_rval);
2700                                 break;
2701                         case RVAL_UDECIMAL:
2702                                 tprintf("= %lu", tcp->u_rval);
2703                                 break;
2704                         case RVAL_DECIMAL:
2705                                 tprintf("= %ld", tcp->u_rval);
2706                                 break;
2707                         case RVAL_FD:
2708                                 if (show_fd_path) {
2709                                         tprints("= ");
2710                                         printfd(tcp, tcp->u_rval);
2711                                 }
2712                                 else
2713                                         tprintf("= %ld", tcp->u_rval);
2714                                 break;
2715 #if defined(LINUX_MIPSN32) || defined(X32)
2716                         /*
2717                         case RVAL_LHEX:
2718                                 tprintf("= %#llx", tcp->u_lrval);
2719                                 break;
2720                         case RVAL_LOCTAL:
2721                                 tprintf("= %#llo", tcp->u_lrval);
2722                                 break;
2723                         */
2724                         case RVAL_LUDECIMAL:
2725                                 tprintf("= %llu", tcp->u_lrval);
2726                                 break;
2727                         /*
2728                         case RVAL_LDECIMAL:
2729                                 tprintf("= %lld", tcp->u_lrval);
2730                                 break;
2731                         */
2732 #endif
2733                         default:
2734                                 fprintf(stderr,
2735                                         "invalid rval format\n");
2736                                 break;
2737                         }
2738                 }
2739                 if ((sys_res & RVAL_STR) && tcp->auxstr)
2740                         tprintf(" (%s)", tcp->auxstr);
2741         }
2742         if (Tflag) {
2743                 tv_sub(&tv, &tv, &tcp->etime);
2744                 tprintf(" <%ld.%06ld>",
2745                         (long) tv.tv_sec, (long) tv.tv_usec);
2746         }
2747         tprints("\n");
2748         dumpio(tcp);
2749         line_ended();
2750
2751 #ifdef USE_LIBUNWIND
2752         if (stack_trace_enabled)
2753                 unwind_print_stacktrace(tcp);
2754 #endif
2755
2756  ret:
2757         tcp->flags &= ~TCB_INSYSCALL;
2758         return 0;
2759 }
2760
2761 int
2762 trace_syscall(struct tcb *tcp)
2763 {
2764         return exiting(tcp) ?
2765                 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
2766 }