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