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  *      $Id$
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <signal.h>
  39 #include <time.h>
  40 #include <errno.h>
  41 #include <sys/user.h>
  42 #include <sys/syscall.h>
  43 #include <sys/param.h>
  44
  45 #if HAVE_ASM_REG_H
  46 #if defined (SPARC) || defined (SPARC64)
  47 #  define fpq kernel_fpq
  48 #  define fq kernel_fq
  49 #  define fpu kernel_fpu
  50 #endif
  51 #include <asm/reg.h>
  52 #if defined (SPARC) || defined (SPARC64)
  53 #  undef fpq
  54 #  undef fq
  55 #  undef fpu
  56 #endif
  57 #endif
  58
  59 #ifdef HAVE_SYS_REG_H
  60 #include <sys/reg.h>
  61 #ifndef PTRACE_PEEKUSR
  62 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  63 #endif
  64 #elif defined(HAVE_LINUX_PTRACE_H)
  65 #undef PTRACE_SYSCALL
  66 # ifdef HAVE_STRUCT_IA64_FPREG
  67 #  define ia64_fpreg XXX_ia64_fpreg
  68 # endif
  69 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
  70 #  define pt_all_user_regs XXX_pt_all_user_regs
  71 # endif
  72 #include <linux/ptrace.h>
  73 # undef ia64_fpreg
  74 # undef pt_all_user_regs
  75 #endif
  76
  77 #if defined (LINUX) && defined (SPARC64)
  78 # define r_pc r_tpc
  79 # undef PTRACE_GETREGS
  80 # define PTRACE_GETREGS PTRACE_GETREGS64
  81 # undef PTRACE_SETREGS
  82 # define PTRACE_SETREGS PTRACE_SETREGS64
  83 #endif /* LINUX && SPARC64 */
  84
  85 #if defined(LINUX) && defined(IA64)
  86 # include <asm/ptrace_offsets.h>
  87 # include <asm/rse.h>
  88 #endif
  89
  90 #define NR_SYSCALL_BASE 0
  91 #ifdef LINUX
  92 #ifndef ERESTARTSYS
  93 #define ERESTARTSYS     512
  94 #endif
  95 #ifndef ERESTARTNOINTR
  96 #define ERESTARTNOINTR  513
  97 #endif
  98 #ifndef ERESTARTNOHAND
  99 #define ERESTARTNOHAND  514     /* restart if no handler.. */
 100 #endif
 101 #ifndef ENOIOCTLCMD
 102 #define ENOIOCTLCMD     515     /* No ioctl command */
 103 #endif
 104 #ifndef ERESTART_RESTARTBLOCK
 105 #define ERESTART_RESTARTBLOCK 516       /* restart by calling sys_restart_syscall */
 106 #endif
 107 #ifndef NSIG
 108 #define NSIG 32
 109 #endif
 110 #ifdef ARM
 111 #undef NSIG
 112 #define NSIG 32
 113 #undef NR_SYSCALL_BASE
 114 #define NR_SYSCALL_BASE __NR_SYSCALL_BASE
 115 #endif
 116 #endif /* LINUX */
 117
 118 #include "syscall.h"
 119
 120 /* Define these shorthand notations to simplify the syscallent files. */
 121 #define TF TRACE_FILE
 122 #define TI TRACE_IPC
 123 #define TN TRACE_NETWORK
 124 #define TP TRACE_PROCESS
 125 #define TS TRACE_SIGNAL
 126
 127 static const struct sysent sysent0[] = {
 128 #include "syscallent.h"
 129 };
 130 static const int nsyscalls0 = sizeof sysent0 / sizeof sysent0[0];
 131
 132 #if SUPPORTED_PERSONALITIES >= 2
 133 static const struct sysent sysent1[] = {
 134 #include "syscallent1.h"
 135 };
 136 static const int nsyscalls1 = sizeof sysent1 / sizeof sysent1[0];
 137 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 138
 139 #if SUPPORTED_PERSONALITIES >= 3
 140 static const struct sysent sysent2[] = {
 141 #include "syscallent2.h"
 142 };
 143 static const int nsyscalls2 = sizeof sysent2 / sizeof sysent2[0];
 144 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 145
 146 const struct sysent *sysent;
 147 int nsyscalls;
 148
 149 /* Now undef them since short defines cause wicked namespace pollution. */
 150 #undef TF
 151 #undef TI
 152 #undef TN
 153 #undef TP
 154 #undef TS
 155
 156 static const char *const errnoent0[] = {
 157 #include "errnoent.h"
 158 };
 159 static const int nerrnos0 = sizeof errnoent0 / sizeof errnoent0[0];
 160
 161 #if SUPPORTED_PERSONALITIES >= 2
 162 static const char *const errnoent1[] = {
 163 #include "errnoent1.h"
 164 };
 165 static const int nerrnos1 = sizeof errnoent1 / sizeof errnoent1[0];
 166 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 167
 168 #if SUPPORTED_PERSONALITIES >= 3
 169 static const char *const errnoent2[] = {
 170 #include "errnoent2.h"
 171 };
 172 static const int nerrnos2 = sizeof errnoent2 / sizeof errnoent2[0];
 173 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 174
 175 const char *const *errnoent;
 176 int nerrnos;
 177
 178 int current_personality;
 179
 180 int
 181 set_personality(personality)
 182 int personality;
 183 {
 184         switch (personality) {
 185         case 0:
 186                 errnoent = errnoent0;
 187                 nerrnos = nerrnos0;
 188                 sysent = sysent0;
 189                 nsyscalls = nsyscalls0;
 190                 ioctlent = ioctlent0;
 191                 nioctlents = nioctlents0;
 192                 signalent = signalent0;
 193                 nsignals = nsignals0;
 194                 break;
 195
 196 #if SUPPORTED_PERSONALITIES >= 2
 197         case 1:
 198                 errnoent = errnoent1;
 199                 nerrnos = nerrnos1;
 200                 sysent = sysent1;
 201                 nsyscalls = nsyscalls1;
 202                 ioctlent = ioctlent1;
 203                 nioctlents = nioctlents1;
 204                 signalent = signalent1;
 205                 nsignals = nsignals1;
 206                 break;
 207 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 208
 209 #if SUPPORTED_PERSONALITIES >= 3
 210         case 2:
 211                 errnoent = errnoent2;
 212                 nerrnos = nerrnos2;
 213                 sysent = sysent2;
 214                 nsyscalls = nsyscalls2;
 215                 ioctlent = ioctlent2;
 216                 nioctlents = nioctlents2;
 217                 signalent = signalent2;
 218                 nsignals = nsignals2;
 219                 break;
 220 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 221
 222         default:
 223                 return -1;
 224         }
 225
 226         current_personality = personality;
 227         return 0;
 228 }
 229
 230 int qual_flags[MAX_QUALS];
 231
 232
 233 struct call_counts {
 234         struct timeval time;
 235         int calls, errors;
 236 };
 237
 238 static struct call_counts *counts;
 239
 240 static struct timeval shortest = { 1000000, 0 };
 241
 242 static int qual_syscall(), qual_signal(), qual_fault(), qual_desc();
 243
 244 static const struct qual_options {
 245         int bitflag;
 246         char *option_name;
 247         int (*qualify)();
 248         char *argument_name;
 249 } qual_options[] = {
 250         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 251         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 252         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 253         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 254         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 255         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 256         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 257         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 258         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 259         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 260         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 261         { QUAL_FAULT,   "fault",        qual_fault,     "fault"         },
 262         { QUAL_FAULT,   "faults",       qual_fault,     "fault"         },
 263         { QUAL_FAULT,   "m",            qual_fault,     "fault"         },
 264         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 265         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 266         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 267         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 268         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 269         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 270         { 0,            NULL,           NULL,           NULL            },
 271 };
 272
 273 static void
 274 qualify_one(n, opt, not)
 275         int n;
 276         const struct qual_options *opt;
 277         int not;
 278 {
 279         if (not)
 280                 qual_flags[n] &= ~opt->bitflag;
 281         else
 282                 qual_flags[n] |= opt->bitflag;
 283 }
 284
 285 static int
 286 qual_syscall(s, opt, not)
 287         char *s;
 288         const struct qual_options *opt;
 289         int not;
 290 {
 291         int i;
 292         int rc = -1;
 293
 294         for (i = 0; i < nsyscalls; i++) {
 295                 if (strcmp(s, sysent[i].sys_name) == 0) {
 296                         qualify_one(i, opt, not);
 297                         rc = 0;
 298                 }
 299         }
 300         return rc;
 301 }
 302
 303 static int
 304 qual_signal(s, opt, not)
 305         char *s;
 306         const struct qual_options *opt;
 307         int not;
 308 {
 309         int i;
 310         char buf[32];
 311
 312         if (s && *s && isdigit((unsigned char)*s)) {
 313                 int signo = atoi(s);
 314                 if (signo < 0 || signo >= MAX_QUALS)
 315                         return -1;
 316                 qualify_one(signo, opt, not);
 317                 return 0;
 318         }
 319         if (strlen(s) >= sizeof buf)
 320                 return -1;
 321         strcpy(buf, s);
 322         s = buf;
 323         for (i = 0; s[i]; i++)
 324                 s[i] = toupper((unsigned char)(s[i]));
 325         if (strncmp(s, "SIG", 3) == 0)
 326                 s += 3;
 327         for (i = 0; i <= NSIG; i++)
 328                 if (strcmp(s, signame(i) + 3) == 0) {
 329                         qualify_one(i, opt, not);
 330                         return 0;
 331                 }
 332         return -1;
 333 }
 334
 335 static int
 336 qual_fault(s, opt, not)
 337         char *s;
 338         const struct qual_options *opt;
 339         int not;
 340 {
 341         return -1;
 342 }
 343
 344 static int
 345 qual_desc(s, opt, not)
 346         char *s;
 347         const struct qual_options *opt;
 348         int not;
 349 {
 350         if (s && *s && isdigit((unsigned char)*s)) {
 351                 int desc = atoi(s);
 352                 if (desc < 0 || desc >= MAX_QUALS)
 353                         return -1;
 354                 qualify_one(desc, opt, not);
 355                 return 0;
 356         }
 357         return -1;
 358 }
 359
 360 static int
 361 lookup_class(s)
 362         char *s;
 363 {
 364         if (strcmp(s, "file") == 0)
 365                 return TRACE_FILE;
 366         if (strcmp(s, "ipc") == 0)
 367                 return TRACE_IPC;
 368         if (strcmp(s, "network") == 0)
 369                 return TRACE_NETWORK;
 370         if (strcmp(s, "process") == 0)
 371                 return TRACE_PROCESS;
 372         if (strcmp(s, "signal") == 0)
 373                 return TRACE_SIGNAL;
 374         return -1;
 375 }
 376
 377 void
 378 qualify(s)
 379 char *s;
 380 {
 381         const struct qual_options *opt;
 382         int not;
 383         char *p;
 384         int i, n;
 385
 386         opt = &qual_options[0];
 387         for (i = 0; (p = qual_options[i].option_name); i++) {
 388                 n = strlen(p);
 389                 if (strncmp(s, p, n) == 0 && s[n] == '=') {
 390                         opt = &qual_options[i];
 391                         s += n + 1;
 392                         break;
 393                 }
 394         }
 395         not = 0;
 396         if (*s == '!') {
 397                 not = 1;
 398                 s++;
 399         }
 400         if (strcmp(s, "none") == 0) {
 401                 not = 1 - not;
 402                 s = "all";
 403         }
 404         if (strcmp(s, "all") == 0) {
 405                 for (i = 0; i < MAX_QUALS; i++) {
 406                         if (not)
 407                                 qual_flags[i] &= ~opt->bitflag;
 408                         else
 409                                 qual_flags[i] |= opt->bitflag;
 410                 }
 411                 return;
 412         }
 413         for (i = 0; i < MAX_QUALS; i++) {
 414                 if (not)
 415                         qual_flags[i] |= opt->bitflag;
 416                 else
 417                         qual_flags[i] &= ~opt->bitflag;
 418         }
 419         for (p = strtok(s, ","); p; p = strtok(NULL, ",")) {
 420                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 421                         for (i = 0; i < MAX_QUALS; i++) {
 422                                 if (sysent[i].sys_flags & n) {
 423                                         if (not)
 424                                                 qual_flags[i] &= ~opt->bitflag;
 425                                         else
 426                                                 qual_flags[i] |= opt->bitflag;
 427                                 }
 428                         }
 429                         continue;
 430                 }
 431                 if (opt->qualify(p, opt, not)) {
 432                         fprintf(stderr, "strace: invalid %s `%s'\n",
 433                                 opt->argument_name, p);
 434                         exit(1);
 435                 }
 436         }
 437         return;
 438 }
 439
 440 static void
 441 dumpio(tcp)
 442 struct tcb *tcp;
 443 {
 444         if (syserror(tcp))
 445                 return;
 446         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= MAX_QUALS)
 447                 return;
 448         switch (tcp->scno + NR_SYSCALL_BASE) {
 449         case SYS_read:
 450 #ifdef SYS_pread64
 451         case SYS_pread64:
 452 #endif
 453 #if defined SYS_pread && SYS_pread64 != SYS_pread
 454         case SYS_pread:
 455 #endif
 456 #ifdef SYS_recv
 457         case SYS_recv:
 458 #endif
 459 #ifdef SYS_recvfrom
 460         case SYS_recvfrom:
 461 #endif
 462                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 463                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 464                 break;
 465         case SYS_write:
 466 #ifdef SYS_pwrite64
 467         case SYS_pwrite64:
 468 #endif
 469 #if defined SYS_pwrite && SYS_pwrite64 != SYS_pwrite
 470         case SYS_pwrite:
 471 #endif
 472 #ifdef SYS_send
 473         case SYS_send:
 474 #endif
 475 #ifdef SYS_sendto
 476         case SYS_sendto:
 477 #endif
 478                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 479                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 480                 break;
 481 #ifdef SYS_readv
 482         case SYS_readv:
 483                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 484                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 485                 break;
 486 #endif
 487 #ifdef SYS_writev
 488         case SYS_writev:
 489
 490                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 491                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 492                 break;
 493 #endif
 494         }
 495 }
 496
 497 #ifndef FREEBSD
 498 enum subcall_style { shift_style, deref_style, mask_style, door_style };
 499 #else /* FREEBSD */
 500 enum subcall_style { shift_style, deref_style, mask_style, door_style, table_style };
 501
 502 struct subcall {
 503   int call;
 504   int nsubcalls;
 505   int subcalls[5];
 506 };
 507
 508 const struct subcall subcalls_table[] = {
 509   { SYS_shmsys, 5, { SYS_shmat, SYS_shmctl, SYS_shmdt, SYS_shmget, SYS_shmctl } },
 510 #ifdef SYS_semconfig
 511   { SYS_semsys, 4, { SYS___semctl, SYS_semget, SYS_semop, SYS_semconfig } },
 512 #else
 513   { SYS_semsys, 3, { SYS___semctl, SYS_semget, SYS_semop } },
 514 #endif
 515   { SYS_msgsys, 4, { SYS_msgctl, SYS_msgget, SYS_msgsnd, SYS_msgrcv } },
 516 };
 517 #endif /* FREEBSD */
 518
 519 #if !(defined(LINUX) && ( defined(ALPHA) || defined(MIPS) ))
 520
 521 const int socket_map [] = {
 522                /* SYS_SOCKET      */ 97,
 523                /* SYS_BIND        */ 104,
 524                /* SYS_CONNECT     */ 98,
 525                /* SYS_LISTEN      */ 106,
 526                /* SYS_ACCEPT      */ 99,
 527                /* SYS_GETSOCKNAME */ 150,
 528                /* SYS_GETPEERNAME */ 141,
 529                /* SYS_SOCKETPAIR  */ 135,
 530                /* SYS_SEND        */ 101,
 531                /* SYS_RECV        */ 102,
 532                /* SYS_SENDTO      */ 133,
 533                /* SYS_RECVFROM    */ 125,
 534                /* SYS_SHUTDOWN    */ 134,
 535                /* SYS_SETSOCKOPT  */ 105,
 536                /* SYS_GETSOCKOPT  */ 118,
 537                /* SYS_SENDMSG     */ 114,
 538                /* SYS_RECVMSG     */ 113
 539 };
 540
 541 void
 542 sparc_socket_decode (tcp)
 543 struct tcb *tcp;
 544 {
 545         volatile long addr;
 546         volatile int i, n;
 547
 548         if (tcp->u_arg [0] < 1 || tcp->u_arg [0] > sizeof(socket_map)/sizeof(int)+1){
 549                 return;
 550         }
 551         tcp->scno = socket_map [tcp->u_arg [0]-1];
 552         n = tcp->u_nargs = sysent [tcp->scno].nargs;
 553         addr = tcp->u_arg [1];
 554         for (i = 0; i < n; i++){
 555                 int arg;
 556                 if (umoven (tcp, addr, sizeof (arg), (void *) &arg) < 0)
 557                         arg = 0;
 558                 tcp->u_arg [i] = arg;
 559                 addr += sizeof (arg);
 560         }
 561 }
 562
 563 void
 564 decode_subcall(tcp, subcall, nsubcalls, style)
 565 struct tcb *tcp;
 566 int subcall;
 567 int nsubcalls;
 568 enum subcall_style style;
 569 {
 570         long addr, mask, arg;
 571         int i;
 572
 573         switch (style) {
 574         case shift_style:
 575                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 576                         return;
 577                 tcp->scno = subcall + tcp->u_arg[0];
 578                 if (sysent[tcp->scno].nargs != -1)
 579                         tcp->u_nargs = sysent[tcp->scno].nargs;
 580                 else
 581                         tcp->u_nargs--;
 582                 for (i = 0; i < tcp->u_nargs; i++)
 583                         tcp->u_arg[i] = tcp->u_arg[i + 1];
 584                 break;
 585         case deref_style:
 586                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 587                         return;
 588                 tcp->scno = subcall + tcp->u_arg[0];
 589                 addr = tcp->u_arg[1];
 590                 for (i = 0; i < sysent[tcp->scno].nargs; i++) {
 591                         if (umove(tcp, addr, &arg) < 0)
 592                                 arg = 0;
 593                         tcp->u_arg[i] = arg;
 594                         addr += sizeof(arg);
 595                 }
 596                 tcp->u_nargs = sysent[tcp->scno].nargs;
 597                 break;
 598         case mask_style:
 599                 mask = (tcp->u_arg[0] >> 8) & 0xff;
 600                 for (i = 0; mask; i++)
 601                         mask >>= 1;
 602                 if (i >= nsubcalls)
 603                         return;
 604                 tcp->u_arg[0] &= 0xff;
 605                 tcp->scno = subcall + i;
 606                 if (sysent[tcp->scno].nargs != -1)
 607                         tcp->u_nargs = sysent[tcp->scno].nargs;
 608                 break;
 609         case door_style:
 610                 /*
 611                  * Oh, yuck.  The call code is the *sixth* argument.
 612                  * (don't you mean the *last* argument? - JH)
 613                  */
 614                 if (tcp->u_arg[5] < 0 || tcp->u_arg[5] >= nsubcalls)
 615                         return;
 616                 tcp->scno = subcall + tcp->u_arg[5];
 617                 if (sysent[tcp->scno].nargs != -1)
 618                         tcp->u_nargs = sysent[tcp->scno].nargs;
 619                 else
 620                         tcp->u_nargs--;
 621                 break;
 622 #ifdef FREEBSD
 623         case table_style:
 624                 for (i = 0; i < sizeof(subcalls_table) / sizeof(struct subcall); i++)
 625                         if (subcalls_table[i].call == tcp->scno) break;
 626                 if (i < sizeof(subcalls_table) / sizeof(struct subcall) &&
 627                     tcp->u_arg[0] >= 0 && tcp->u_arg[0] < subcalls_table[i].nsubcalls) {
 628                         tcp->scno = subcalls_table[i].subcalls[tcp->u_arg[0]];
 629                         for (i = 0; i < tcp->u_nargs; i++)
 630                                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 631                 }
 632                 break;
 633 #endif /* FREEBSD */
 634         }
 635 }
 636 #endif
 637
 638 struct tcb *tcp_last = NULL;
 639
 640 static int
 641 internal_syscall(tcp)
 642 struct tcb *tcp;
 643 {
 644         /*
 645          * We must always trace a few critical system calls in order to
 646          * correctly support following forks in the presence of tracing
 647          * qualifiers.
 648          */
 649         switch (tcp->scno + NR_SYSCALL_BASE) {
 650 #ifdef SYS_fork
 651         case SYS_fork:
 652 #endif
 653 #ifdef SYS_vfork
 654         case SYS_vfork:
 655 #endif
 656 #ifdef SYS_fork1
 657         case SYS_fork1:
 658 #endif
 659 #ifdef SYS_forkall
 660         case SYS_forkall:
 661 #endif
 662 #ifdef SYS_rfork1
 663         case SYS_rfork1:
 664 #endif
 665 #ifdef SYS_rforkall
 666         case SYS_rforkall:
 667 #endif
 668 #ifdef SYS_rfork
 669         case SYS_rfork:
 670 #endif
 671                 internal_fork(tcp);
 672                 break;
 673 #ifdef SYS_clone
 674         case SYS_clone:
 675                 internal_clone(tcp);
 676                 break;
 677 #endif
 678 #ifdef SYS_clone2
 679         case SYS_clone2:
 680                 internal_clone(tcp);
 681                 break;
 682 #endif
 683 #ifdef SYS_execv
 684         case SYS_execv:
 685 #endif
 686 #ifdef SYS_execve
 687         case SYS_execve:
 688 #endif
 689 #ifdef SYS_rexecve
 690         case SYS_rexecve:
 691 #endif
 692                 internal_exec(tcp);
 693                 break;
 694
 695 #ifdef SYS_wait
 696         case SYS_wait:
 697 #endif
 698 #ifdef SYS_wait4
 699         case SYS_wait4:
 700 #endif
 701 #ifdef SYS32_wait4
 702         case SYS32_wait4:
 703 #endif
 704 #ifdef SYS_waitpid
 705         case SYS_waitpid:
 706 #endif
 707 #ifdef SYS_waitsys
 708         case SYS_waitsys:
 709 #endif
 710                 internal_wait(tcp, 2);
 711                 break;
 712 #ifdef SYS_waitid
 713         case SYS_waitid:
 714                 internal_wait(tcp, 3);
 715                 break;
 716 #endif
 717
 718 #ifdef SYS_exit
 719         case SYS_exit:
 720 #endif
 721 #ifdef SYS32_exit
 722         case SYS32_exit:
 723 #endif
 724 #ifdef __NR_exit_group
 725         case __NR_exit_group:
 726 #endif
 727 #ifdef IA64
 728         case 252: /* IA-32 __NR_exit_group */
 729 #endif
 730                 internal_exit(tcp);
 731                 break;
 732         }
 733         return 0;
 734 }
 735
 736
 737 #ifdef LINUX
 738 #if defined (I386)
 739         static long eax;
 740 #elif defined (IA64)
 741         long r8, r10, psr;
 742         long ia32 = 0;
 743 #elif defined (POWERPC)
 744         static long result,flags;
 745 #elif defined (M68K)
 746         static int d0;
 747 #elif defined (ARM)
 748         static struct pt_regs regs;
 749 #elif defined (ALPHA)
 750         static long r0;
 751         static long a3;
 752 #elif defined (SPARC) || defined (SPARC64)
 753         static struct regs regs;
 754         static unsigned long trap;
 755 #elif defined(MIPS)
 756         static long a3;
 757         static long r2;
 758 #elif defined(S390) || defined(S390X)
 759         static long gpr2;
 760         static long pc;
 761         static long syscall_mode;
 762 #elif defined(HPPA)
 763         static long r28;
 764 #elif defined(SH)
 765        static long r0;
 766 #elif defined(SH64)
 767        static long r9;
 768 #elif defined(X86_64)
 769        static long rax;
 770 #endif
 771 #endif /* LINUX */
 772 #ifdef FREEBSD
 773         struct reg regs;
 774 #endif /* FREEBSD */
 775
 776 int
 777 get_scno(tcp)
 778 struct tcb *tcp;
 779 {
 780         long scno = 0;
 781 #ifndef USE_PROCFS
 782         int pid = tcp->pid;
 783 #endif /* !PROCFS */
 784
 785 #ifdef LINUX
 786 #if defined(S390) || defined(S390X)
 787         if (tcp->flags & TCB_WAITEXECVE) {
 788                 /*
 789                  * When the execve system call completes successfully, the
 790                  * new process still has -ENOSYS (old style) or __NR_execve
 791                  * (new style) in gpr2.  We cannot recover the scno again
 792                  * by disassembly, because the image that executed the
 793                  * syscall is gone now.  Fortunately, we don't want it.  We
 794                  * leave the flag set so that syscall_fixup can fake the
 795                  * result.
 796                  */
 797                 if (tcp->flags & TCB_INSYSCALL)
 798                         return 1;
 799                 /*
 800                  * This is the SIGTRAP after execve.  We cannot try to read
 801                  * the system call here either.
 802                  */
 803                 tcp->flags &= ~TCB_WAITEXECVE;
 804                 return 0;
 805         }
 806
 807         if (upeek(pid, PT_GPR2, &syscall_mode) < 0)
 808                         return -1;
 809
 810         if (syscall_mode != -ENOSYS) {
 811                 /*
 812                  * Since kernel version 2.5.44 the scno gets passed in gpr2.
 813                  */
 814                 scno = syscall_mode;
 815         } else {
 816                 /*
 817                  * Old style of "passing" the scno via the SVC instruction.
 818                  */
 819
 820                 long opcode, offset_reg, tmp;
 821                 void * svc_addr;
 822                 int gpr_offset[16] = {PT_GPR0,  PT_GPR1,  PT_ORIGGPR2, PT_GPR3,
 823                                       PT_GPR4,  PT_GPR5,  PT_GPR6,     PT_GPR7,
 824                                       PT_GPR8,  PT_GPR9,  PT_GPR10,    PT_GPR11,
 825                                       PT_GPR12, PT_GPR13, PT_GPR14,    PT_GPR15};
 826
 827                 if (upeek(pid, PT_PSWADDR, &pc) < 0)
 828                         return -1;
 829                 errno = 0;
 830                 opcode = ptrace(PTRACE_PEEKTEXT, pid, (char *)(pc-sizeof(long)), 0);
 831                 if (errno) {
 832                         perror("peektext(pc-oneword)");
 833                         return -1;
 834                 }
 835
 836                 /*
 837                  *  We have to check if the SVC got executed directly or via an
 838                  *  EXECUTE instruction. In case of EXECUTE it is necessary to do
 839                  *  instruction decoding to derive the system call number.
 840                  *  Unfortunately the opcode sizes of EXECUTE and SVC are differently,
 841                  *  so that this doesn't work if a SVC opcode is part of an EXECUTE
 842                  *  opcode. Since there is no way to find out the opcode size this
 843                  *  is the best we can do...
 844                  */
 845
 846                 if ((opcode & 0xff00) == 0x0a00) {
 847                         /* SVC opcode */
 848                         scno = opcode & 0xff;
 849                 }
 850                 else {
 851                         /* SVC got executed by EXECUTE instruction */
 852
 853                         /*
 854                          *  Do instruction decoding of EXECUTE. If you really want to
 855                          *  understand this, read the Principles of Operations.
 856                          */
 857                         svc_addr = (void *) (opcode & 0xfff);
 858
 859                         tmp = 0;
 860                         offset_reg = (opcode & 0x000f0000) >> 16;
 861                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 862                                 return -1;
 863                         svc_addr += tmp;
 864
 865                         tmp = 0;
 866                         offset_reg = (opcode & 0x0000f000) >> 12;
 867                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 868                                 return -1;
 869                         svc_addr += tmp;
 870
 871                         scno = ptrace(PTRACE_PEEKTEXT, pid, svc_addr, 0);
 872                         if (errno)
 873                                 return -1;
 874 #if defined(S390X)
 875                         scno >>= 48;
 876 #else
 877                         scno >>= 16;
 878 #endif
 879                         tmp = 0;
 880                         offset_reg = (opcode & 0x00f00000) >> 20;
 881                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 882                                 return -1;
 883
 884                         scno = (scno | tmp) & 0xff;
 885                 }
 886         }
 887 #elif defined (POWERPC)
 888         if (upeek(pid, sizeof(unsigned long)*PT_R0, &scno) < 0)
 889                 return -1;
 890         if (!(tcp->flags & TCB_INSYSCALL)) {
 891                 /* Check if we return from execve. */
 892                 if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 893                         tcp->flags &= ~TCB_WAITEXECVE;
 894                         return 0;
 895                 }
 896         }
 897 #elif defined (I386)
 898         if (upeek(pid, 4*ORIG_EAX, &scno) < 0)
 899                 return -1;
 900 #elif defined (X86_64)
 901         if (upeek(pid, 8*ORIG_RAX, &scno) < 0)
 902                 return -1;
 903
 904         if (!(tcp->flags & TCB_INSYSCALL)) {
 905                 static int currpers=-1;
 906                 long val;
 907
 908                 /* Check CS register value. On x86-64 linux it is:
 909                  *      0x33    for long mode (64 bit)
 910                  *      0x23    for compatibility mode (32 bit)
 911                  * It takes only one ptrace and thus doesn't need
 912                  * to be cached.
 913                  */
 914                 if (upeek(pid, 8*CS, &val) < 0)
 915                         return -1;
 916                 switch(val)
 917                 {
 918                         case 0x23: currpers = 1; break;
 919                         case 0x33: currpers = 0; break;
 920                         default:
 921                                 fprintf(stderr, "Unknown value CS=0x%02X while "
 922                                          "detecting personality of process "
 923                                          "PID=%d\n", (int)val, pid);
 924                                 currpers = current_personality;
 925                                 break;
 926                 }
 927 #if 0
 928                 /* This version analyzes the opcode of a syscall instruction.
 929                  * (int 0x80 on i386 vs. syscall on x86-64)
 930                  * It works, but is too complicated.
 931                  */
 932                 unsigned long val, rip, i;
 933
 934                 if(upeek(pid, 8*RIP, &rip)<0)
 935                         perror("upeek(RIP)");
 936
 937                 /* sizeof(syscall) == sizeof(int 0x80) == 2 */
 938                 rip-=2;
 939                 errno = 0;
 940
 941                 call = ptrace(PTRACE_PEEKTEXT,pid,(char *)rip,0);
 942                 if (errno)
 943                         printf("ptrace_peektext failed: %s\n",
 944                                         strerror(errno));
 945                 switch (call & 0xffff)
 946                 {
 947                         /* x86-64: syscall = 0x0f 0x05 */
 948                         case 0x050f: currpers = 0; break;
 949                         /* i386: int 0x80 = 0xcd 0x80 */
 950                         case 0x80cd: currpers = 1; break;
 951                         default:
 952                                 currpers = current_personality;
 953                                 fprintf(stderr,
 954                                         "Unknown syscall opcode (0x%04X) while "
 955                                         "detecting personality of process "
 956                                         "PID=%d\n", (int)call, pid);
 957                                 break;
 958                 }
 959 #endif
 960                 if(currpers != current_personality)
 961                 {
 962                         char *names[]={"64 bit", "32 bit"};
 963                         set_personality(currpers);
 964                         printf("[ Process PID=%d runs in %s mode. ]\n",
 965                                         pid, names[current_personality]);
 966                 }
 967         }
 968 #elif defined(IA64)
 969 #       define IA64_PSR_IS      ((long)1 << 34)
 970         if (upeek (pid, PT_CR_IPSR, &psr) >= 0)
 971                 ia32 = (psr & IA64_PSR_IS) != 0;
 972         if (!(tcp->flags & TCB_INSYSCALL)) {
 973                 if (ia32) {
 974                         if (upeek(pid, PT_R1, &scno) < 0)       /* orig eax */
 975                                 return -1;
 976                 } else {
 977                         if (upeek (pid, PT_R15, &scno) < 0)
 978                                 return -1;
 979                 }
 980                 /* Check if we return from execve. */
 981                 if (tcp->flags & TCB_WAITEXECVE) {
 982                         tcp->flags &= ~TCB_WAITEXECVE;
 983                         return 0;
 984                 }
 985         } else {
 986                 /* syscall in progress */
 987                 if (upeek (pid, PT_R8, &r8) < 0)
 988                         return -1;
 989                 if (upeek (pid, PT_R10, &r10) < 0)
 990                         return -1;
 991         }
 992 #elif defined (ARM)
 993         /*
 994          * Read complete register set in one go.
 995          */
 996         if (ptrace(PTRACE_GETREGS, pid, NULL, (void *)&regs) == -1)
 997                 return -1;
 998
 999         /*
1000          * We only need to grab the syscall number on syscall entry.
1001          */
1002         if (regs.ARM_ip == 0) {
1003                 /*
1004                  * Note: we only deal with only 32-bit CPUs here.
1005                  */
1006                 if (regs.ARM_cpsr & 0x20) {
1007                         /*
1008                          * Get the Thumb-mode system call number
1009                          */
1010                         scno = regs.ARM_r7;
1011                 } else {
1012                         /*
1013                          * Get the ARM-mode system call number
1014                          */
1015                         errno = 0;
1016                         scno = ptrace(PTRACE_PEEKTEXT, pid, (void *)(regs.ARM_pc - 4), NULL);
1017                         if (errno)
1018                                 return -1;
1019
1020                         if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
1021                                 tcp->flags &= ~TCB_WAITEXECVE;
1022                                 return 0;
1023                         }
1024
1025                         if ((scno & 0x0ff00000) != 0x0f900000) {
1026                                 fprintf(stderr, "syscall: unknown syscall trap 0x%08lx\n",
1027                                         scno);
1028                                 return -1;
1029                         }
1030
1031                         /*
1032                          * Fixup the syscall number
1033                          */
1034                         scno &= 0x000fffff;
1035                 }
1036
1037                 if (tcp->flags & TCB_INSYSCALL) {
1038                         fprintf(stderr, "pid %d stray syscall entry\n", tcp->pid);
1039                         tcp->flags &= ~TCB_INSYSCALL;
1040                 }
1041         } else {
1042                 if (!(tcp->flags & TCB_INSYSCALL)) {
1043                         fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
1044                         tcp->flags |= TCB_INSYSCALL;
1045                 }
1046         }
1047 #elif defined (M68K)
1048         if (upeek(pid, 4*PT_ORIG_D0, &scno) < 0)
1049                 return -1;
1050 #elif defined (MIPS)
1051         if (upeek(pid, REG_A3, &a3) < 0)
1052                 return -1;
1053
1054         if(!(tcp->flags & TCB_INSYSCALL)) {
1055                 if (upeek(pid, REG_V0, &scno) < 0)
1056                         return -1;
1057
1058                 if (scno < 0 || scno > nsyscalls) {
1059                         if(a3 == 0 || a3 == -1) {
1060                                 if(debug)
1061                                         fprintf (stderr, "stray syscall exit: v0 = %ld\n", scno);
1062                                 return 0;
1063                         }
1064                 }
1065         } else {
1066                 if (upeek(pid, REG_V0, &r2) < 0)
1067                         return -1;
1068         }
1069 #elif defined (ALPHA)
1070         if (upeek(pid, REG_A3, &a3) < 0)
1071                 return -1;
1072
1073         if (!(tcp->flags & TCB_INSYSCALL)) {
1074                 if (upeek(pid, REG_R0, &scno) < 0)
1075                         return -1;
1076
1077                 /* Check if we return from execve. */
1078                 if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
1079                         tcp->flags &= ~TCB_WAITEXECVE;
1080                         return 0;
1081                 }
1082
1083                 /*
1084                  * Do some sanity checks to figure out if it's
1085                  * really a syscall entry
1086                  */
1087                 if (scno < 0 || scno > nsyscalls) {
1088                         if (a3 == 0 || a3 == -1) {
1089                                 if (debug)
1090                                         fprintf (stderr, "stray syscall exit: r0 = %ld\n", scno);
1091                                 return 0;
1092                         }
1093                 }
1094         }
1095         else {
1096                 if (upeek(pid, REG_R0, &r0) < 0)
1097                         return -1;
1098         }
1099 #elif defined (SPARC) || defined (SPARC64)
1100         /* Everything we need is in the current register set. */
1101         if (ptrace(PTRACE_GETREGS,pid,(char *)&regs,0) < 0)
1102                 return -1;
1103
1104         /* If we are entering, then disassemble the syscall trap. */
1105         if (!(tcp->flags & TCB_INSYSCALL)) {
1106                 /* Retrieve the syscall trap instruction. */
1107                 errno = 0;
1108                 trap = ptrace(PTRACE_PEEKTEXT,pid,(char *)regs.r_pc,0);
1109 #if defined(SPARC64)
1110                 trap >>= 32;
1111 #endif
1112                 if (errno)
1113                         return -1;
1114
1115                 /* Disassemble the trap to see what personality to use. */
1116                 switch (trap) {
1117                 case 0x91d02010:
1118                         /* Linux/SPARC syscall trap. */
1119                         set_personality(0);
1120                         break;
1121                 case 0x91d0206d:
1122                         /* Linux/SPARC64 syscall trap. */
1123                         set_personality(2);
1124                         break;
1125                 case 0x91d02000:
1126                         /* SunOS syscall trap. (pers 1) */
1127                         fprintf(stderr,"syscall: SunOS no support\n");
1128                         return -1;
1129                 case 0x91d02008:
1130                         /* Solaris 2.x syscall trap. (per 2) */
1131                         set_personality(1);
1132                         break;
1133                 case 0x91d02009:
1134                         /* NetBSD/FreeBSD syscall trap. */
1135                         fprintf(stderr,"syscall: NetBSD/FreeBSD not supported\n");
1136                         return -1;
1137                 case 0x91d02027:
1138                         /* Solaris 2.x gettimeofday */
1139                         set_personality(1);
1140                         break;
1141                 default:
1142                         /* Unknown syscall trap. */
1143                         if(tcp->flags & TCB_WAITEXECVE) {
1144                                 tcp->flags &= ~TCB_WAITEXECVE;
1145                                 return 0;
1146                         }
1147 #if defined (SPARC64)
1148                         fprintf(stderr,"syscall: unknown syscall trap %08lx %016lx\n", trap, regs.r_tpc);
1149 #else
1150                         fprintf(stderr,"syscall: unknown syscall trap %08x %08x\n", trap, regs.r_pc);
1151 #endif
1152                         return -1;
1153                 }
1154
1155                 /* Extract the system call number from the registers. */
1156                 if (trap == 0x91d02027)
1157                         scno = 156;
1158                 else
1159                         scno = regs.r_g1;
1160                 if (scno == 0) {
1161                         scno = regs.r_o0;
1162                         memmove (&regs.r_o0, &regs.r_o1, 7*sizeof(regs.r_o0));
1163                 }
1164         }
1165 #elif defined(HPPA)
1166         if (upeek(pid, PT_GR20, &scno) < 0)
1167                 return -1;
1168         if (!(tcp->flags & TCB_INSYSCALL)) {
1169                 /* Check if we return from execve. */
1170                 if ((tcp->flags & TCB_WAITEXECVE)) {
1171                         tcp->flags &= ~TCB_WAITEXECVE;
1172                         return 0;
1173                 }
1174         }
1175 #elif defined(SH)
1176        /*
1177         * In the new syscall ABI, the system call number is in R3.
1178         */
1179        if (upeek(pid, 4*(REG_REG0+3), &scno) < 0)
1180                return -1;
1181
1182        if (scno < 0) {
1183            /* Odd as it may seem, a glibc bug has been known to cause
1184               glibc to issue bogus negative syscall numbers.  So for
1185               our purposes, make strace print what it *should* have been */
1186            long correct_scno = (scno & 0xff);
1187            if (debug)
1188                fprintf(stderr,
1189                    "Detected glibc bug: bogus system call number = %ld, "
1190                    "correcting to %ld\n",
1191                    scno,
1192                    correct_scno);
1193            scno = correct_scno;
1194        }
1195
1196
1197        if (!(tcp->flags & TCB_INSYSCALL)) {
1198                /* Check if we return from execve. */
1199                if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
1200                        tcp->flags &= ~TCB_WAITEXECVE;
1201                        return 0;
1202                }
1203        }
1204 #elif defined(SH64)
1205         if (upeek(pid, REG_SYSCALL, &scno) < 0)
1206                 return -1;
1207         scno &= 0xFFFF;
1208
1209         if (!(tcp->flags & TCB_INSYSCALL)) {
1210                 /* Check if we return from execve. */
1211                 if (tcp->flags & TCB_WAITEXECVE) {
1212                         tcp->flags &= ~TCB_WAITEXECVE;
1213                         return 0;
1214                 }
1215         }
1216 #endif /* SH64 */
1217 #endif /* LINUX */
1218 #ifdef SUNOS4
1219         if (upeek(pid, uoff(u_arg[7]), &scno) < 0)
1220                 return -1;
1221 #elif defined(SH)
1222         /* new syscall ABI returns result in R0 */
1223         if (upeek(pid, 4*REG_REG0, (long *)&r0) < 0)
1224                 return -1;
1225 #elif defined(SH64)
1226         /* ABI defines result returned in r9 */
1227         if (upeek(pid, REG_GENERAL(9), (long *)&r9) < 0)
1228                 return -1;
1229
1230 #endif
1231 #ifdef USE_PROCFS
1232 #ifdef HAVE_PR_SYSCALL
1233         scno = tcp->status.PR_SYSCALL;
1234 #else /* !HAVE_PR_SYSCALL */
1235 #ifndef FREEBSD
1236         scno = tcp->status.PR_WHAT;
1237 #else /* FREEBSD */
1238         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1239                 perror("pread");
1240                 return -1;
1241         }
1242         switch (regs.r_eax) {
1243         case SYS_syscall:
1244         case SYS___syscall:
1245                 pread(tcp->pfd, &scno, sizeof(scno), regs.r_esp + sizeof(int));
1246                 break;
1247         default:
1248                 scno = regs.r_eax;
1249                 break;
1250         }
1251 #endif /* FREEBSD */
1252 #endif /* !HAVE_PR_SYSCALL */
1253 #endif /* USE_PROCFS */
1254         if (!(tcp->flags & TCB_INSYSCALL))
1255                 tcp->scno = scno;
1256         return 1;
1257 }
1258
1259
1260 int
1261 syscall_fixup(tcp)
1262 struct tcb *tcp;
1263 {
1264 #ifndef USE_PROCFS
1265         int pid = tcp->pid;
1266 #else /* USE_PROCFS */
1267         int scno = tcp->scno;
1268
1269         if (!(tcp->flags & TCB_INSYSCALL)) {
1270                 if (tcp->status.PR_WHY != PR_SYSENTRY) {
1271                         if (
1272                             scno == SYS_fork
1273 #ifdef SYS_vfork
1274                             || scno == SYS_vfork
1275 #endif /* SYS_vfork */
1276 #ifdef SYS_fork1
1277                             || scno == SYS_fork1
1278 #endif /* SYS_fork1 */
1279 #ifdef SYS_forkall
1280                             || scno == SYS_forkall
1281 #endif /* SYS_forkall */
1282 #ifdef SYS_rfork1
1283                             || scno == SYS_rfork1
1284 #endif /* SYS_fork1 */
1285 #ifdef SYS_rforkall
1286                             || scno == SYS_rforkall
1287 #endif /* SYS_rforkall */
1288                             ) {
1289                                 /* We are returning in the child, fake it. */
1290                                 tcp->status.PR_WHY = PR_SYSENTRY;
1291                                 trace_syscall(tcp);
1292                                 tcp->status.PR_WHY = PR_SYSEXIT;
1293                         }
1294                         else {
1295                                 fprintf(stderr, "syscall: missing entry\n");
1296                                 tcp->flags |= TCB_INSYSCALL;
1297                         }
1298                 }
1299         }
1300         else {
1301                 if (tcp->status.PR_WHY != PR_SYSEXIT) {
1302                         fprintf(stderr, "syscall: missing exit\n");
1303                         tcp->flags &= ~TCB_INSYSCALL;
1304                 }
1305         }
1306 #endif /* USE_PROCFS */
1307 #ifdef SUNOS4
1308         if (!(tcp->flags & TCB_INSYSCALL)) {
1309                 if (scno == 0) {
1310                         fprintf(stderr, "syscall: missing entry\n");
1311                         tcp->flags |= TCB_INSYSCALL;
1312                 }
1313         }
1314         else {
1315                 if (scno != 0) {
1316                         if (debug) {
1317                                 /*
1318                                  * This happens when a signal handler
1319                                  * for a signal which interrupted a
1320                                  * a system call makes another system call.
1321                                  */
1322                                 fprintf(stderr, "syscall: missing exit\n");
1323                         }
1324                         tcp->flags &= ~TCB_INSYSCALL;
1325                 }
1326         }
1327 #endif /* SUNOS4 */
1328 #ifdef LINUX
1329 #if defined (I386)
1330         if (upeek(pid, 4*EAX, &eax) < 0)
1331                 return -1;
1332         if (eax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1333                 if (debug)
1334                         fprintf(stderr, "stray syscall exit: eax = %ld\n", eax);
1335                 return 0;
1336         }
1337 #elif defined (X86_64)
1338         if (upeek(pid, 8*RAX, &rax) < 0)
1339                 return -1;
1340         if (current_personality == 1)
1341                 rax = (long int)(int)rax; /* sign extend from 32 bits */
1342         if (rax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1343                 if (debug)
1344                         fprintf(stderr, "stray syscall exit: rax = %ld\n", rax);
1345                 return 0;
1346         }
1347 #elif defined (S390) || defined (S390X)
1348         if (upeek(pid, PT_GPR2, &gpr2) < 0)
1349                 return -1;
1350         if (syscall_mode != -ENOSYS)
1351                 syscall_mode = tcp->scno;
1352         if (gpr2 != syscall_mode && !(tcp->flags & TCB_INSYSCALL)) {
1353                 if (debug)
1354                         fprintf(stderr, "stray syscall exit: gpr2 = %ld\n", gpr2);
1355                 return 0;
1356         }
1357         else if (((tcp->flags & (TCB_INSYSCALL|TCB_WAITEXECVE))
1358                   == (TCB_INSYSCALL|TCB_WAITEXECVE))
1359                  && (gpr2 == -ENOSYS || gpr2 == tcp->scno)) {
1360                 /*
1361                  * Fake a return value of zero.  We leave the TCB_WAITEXECVE
1362                  * flag set for the post-execve SIGTRAP to see and reset.
1363                  */
1364                 gpr2 = 0;
1365         }
1366 #elif defined (POWERPC)
1367 # define SO_MASK 0x10000000
1368         if (upeek(pid, sizeof(unsigned long)*PT_CCR, &flags) < 0)
1369                 return -1;
1370         if (upeek(pid, sizeof(unsigned long)*PT_R3, &result) < 0)
1371                 return -1;
1372         if (flags & SO_MASK)
1373                 result = -result;
1374 #elif defined (M68K)
1375         if (upeek(pid, 4*PT_D0, &d0) < 0)
1376                 return -1;
1377         if (d0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1378                 if (debug)
1379                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", d0);
1380                 return 0;
1381         }
1382 #elif defined (ARM)
1383         /*
1384          * Nothing required
1385          */
1386 #elif defined (HPPA)
1387         if (upeek(pid, PT_GR28, &r28) < 0)
1388                 return -1;
1389 #elif defined(IA64)
1390         if (upeek(pid, PT_R10, &r10) < 0)
1391                 return -1;
1392         if (upeek(pid, PT_R8, &r8) < 0)
1393                 return -1;
1394         if (ia32 && r8 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1395                 if (debug)
1396                         fprintf(stderr, "stray syscall exit: r8 = %ld\n", r8);
1397                 return 0;
1398         }
1399 #endif
1400 #endif /* LINUX */
1401         return 1;
1402 }
1403
1404 int
1405 get_error(tcp)
1406 struct tcb *tcp;
1407 {
1408         int u_error = 0;
1409 #ifdef LINUX
1410 #if defined(S390) || defined(S390X)
1411                 if (gpr2 && (unsigned) -gpr2 < nerrnos) {
1412                         tcp->u_rval = -1;
1413                         u_error = -gpr2;
1414                 }
1415                 else {
1416                         tcp->u_rval = gpr2;
1417                         u_error = 0;
1418                 }
1419 #else /* !S390 && !S390X */
1420 #ifdef I386
1421                 if (eax < 0 && -eax < nerrnos) {
1422                         tcp->u_rval = -1;
1423                         u_error = -eax;
1424                 }
1425                 else {
1426                         tcp->u_rval = eax;
1427                         u_error = 0;
1428                 }
1429 #else /* !I386 */
1430 #ifdef X86_64
1431                 if (rax < 0 && -rax < nerrnos) {
1432                         tcp->u_rval = -1;
1433                         u_error = -rax;
1434                 }
1435                 else {
1436                         tcp->u_rval = rax;
1437                         u_error = 0;
1438                 }
1439 #else
1440 #ifdef IA64
1441                 if (ia32) {
1442                         int err;
1443
1444                         err = (int)r8;
1445                         if (err < 0 && -err < nerrnos) {
1446                                 tcp->u_rval = -1;
1447                                 u_error = -err;
1448                         }
1449                         else {
1450                                 tcp->u_rval = err;
1451                                 u_error = 0;
1452                         }
1453                 } else {
1454                         if (r10) {
1455                                 tcp->u_rval = -1;
1456                                 u_error = r8;
1457                         } else {
1458                                 tcp->u_rval = r8;
1459                                 u_error = 0;
1460                         }
1461                 }
1462 #else /* !IA64 */
1463 #ifdef MIPS
1464                 if (a3) {
1465                         tcp->u_rval = -1;
1466                         u_error = r2;
1467                 } else {
1468                         tcp->u_rval = r2;
1469                         u_error = 0;
1470                 }
1471 #else
1472 #ifdef POWERPC
1473                 if (result && (unsigned long) -result < nerrnos) {
1474                         tcp->u_rval = -1;
1475                         u_error = -result;
1476                 }
1477                 else {
1478                         tcp->u_rval = result;
1479                         u_error = 0;
1480                 }
1481 #else /* !POWERPC */
1482 #ifdef M68K
1483                 if (d0 && (unsigned) -d0 < nerrnos) {
1484                         tcp->u_rval = -1;
1485                         u_error = -d0;
1486                 }
1487                 else {
1488                         tcp->u_rval = d0;
1489                         u_error = 0;
1490                 }
1491 #else /* !M68K */
1492 #ifdef ARM
1493                 if (regs.ARM_r0 && (unsigned) -regs.ARM_r0 < nerrnos) {
1494                         tcp->u_rval = -1;
1495                         u_error = -regs.ARM_r0;
1496                 }
1497                 else {
1498                         tcp->u_rval = regs.ARM_r0;
1499                         u_error = 0;
1500                 }
1501 #else /* !ARM */
1502 #ifdef ALPHA
1503                 if (a3) {
1504                         tcp->u_rval = -1;
1505                         u_error = r0;
1506                 }
1507                 else {
1508                         tcp->u_rval = r0;
1509                         u_error = 0;
1510                 }
1511 #else /* !ALPHA */
1512 #ifdef SPARC
1513                 if (regs.r_psr & PSR_C) {
1514                         tcp->u_rval = -1;
1515                         u_error = regs.r_o0;
1516                 }
1517                 else {
1518                         tcp->u_rval = regs.r_o0;
1519                         u_error = 0;
1520                 }
1521 #else /* !SPARC */
1522 #ifdef SPARC64
1523                 if (regs.r_tstate & 0x1100000000UL) {
1524                         tcp->u_rval = -1;
1525                         u_error = regs.r_o0;
1526                 }
1527                 else {
1528                         tcp->u_rval = regs.r_o0;
1529                         u_error = 0;
1530                 }
1531 #else /* !SPARC64 */
1532 #ifdef HPPA
1533                 if (r28 && (unsigned) -r28 < nerrnos) {
1534                         tcp->u_rval = -1;
1535                         u_error = -r28;
1536                 }
1537                 else {
1538                         tcp->u_rval = r28;
1539                         u_error = 0;
1540                 }
1541 #else
1542 #ifdef SH
1543                /* interpret R0 as return value or error number */
1544                if (r0 && (unsigned) -r0 < nerrnos) {
1545                        tcp->u_rval = -1;
1546                        u_error = -r0;
1547                }
1548                else {
1549                        tcp->u_rval = r0;
1550                        u_error = 0;
1551                }
1552 #else
1553 #ifdef SH64
1554                 /* interpret result as return value or error number */
1555                 if (r9 && (unsigned) -r9 < nerrnos) {
1556                         tcp->u_rval = -1;
1557                         u_error = -r9;
1558                 }
1559                 else {
1560                         tcp->u_rval = r9;
1561                         u_error = 0;
1562                 }
1563 #endif /* SH64 */
1564 #endif /* SH */
1565 #endif /* HPPA */
1566 #endif /* SPARC */
1567 #endif /* SPARC64 */
1568 #endif /* ALPHA */
1569 #endif /* ARM */
1570 #endif /* M68K */
1571 #endif /* POWERPC */
1572 #endif /* MIPS */
1573 #endif /* IA64 */
1574 #endif /* X86_64 */
1575 #endif /* I386 */
1576 #endif /* S390 || S390X */
1577 #endif /* LINUX */
1578 #ifdef SUNOS4
1579                 /* get error code from user struct */
1580                 if (upeek(pid, uoff(u_error), &u_error) < 0)
1581                         return -1;
1582                 u_error >>= 24; /* u_error is a char */
1583
1584                 /* get system call return value */
1585                 if (upeek(pid, uoff(u_rval1), &tcp->u_rval) < 0)
1586                         return -1;
1587 #endif /* SUNOS4 */
1588 #ifdef SVR4
1589 #ifdef SPARC
1590                 /* Judicious guessing goes a long way. */
1591                 if (tcp->status.pr_reg[R_PSR] & 0x100000) {
1592                         tcp->u_rval = -1;
1593                         u_error = tcp->status.pr_reg[R_O0];
1594                 }
1595                 else {
1596                         tcp->u_rval = tcp->status.pr_reg[R_O0];
1597                         u_error = 0;
1598                 }
1599 #endif /* SPARC */
1600 #ifdef I386
1601                 /* Wanna know how to kill an hour single-stepping? */
1602                 if (tcp->status.PR_REG[EFL] & 0x1) {
1603                         tcp->u_rval = -1;
1604                         u_error = tcp->status.PR_REG[EAX];
1605                 }
1606                 else {
1607                         tcp->u_rval = tcp->status.PR_REG[EAX];
1608 #ifdef HAVE_LONG_LONG
1609                         tcp->u_lrval =
1610                                 ((unsigned long long) tcp->status.PR_REG[EDX] << 32) +
1611                                 tcp->status.PR_REG[EAX];
1612 #endif
1613                         u_error = 0;
1614                 }
1615 #endif /* I386 */
1616 #ifdef X86_64
1617                 /* Wanna know how to kill an hour single-stepping? */
1618                 if (tcp->status.PR_REG[EFLAGS] & 0x1) {
1619                         tcp->u_rval = -1;
1620                         u_error = tcp->status.PR_REG[RAX];
1621                 }
1622                 else {
1623                         tcp->u_rval = tcp->status.PR_REG[RAX];
1624                         u_error = 0;
1625                 }
1626 #endif /* X86_64 */
1627 #ifdef MIPS
1628                 if (tcp->status.pr_reg[CTX_A3]) {
1629                         tcp->u_rval = -1;
1630                         u_error = tcp->status.pr_reg[CTX_V0];
1631                 }
1632                 else {
1633                         tcp->u_rval = tcp->status.pr_reg[CTX_V0];
1634                         u_error = 0;
1635                 }
1636 #endif /* MIPS */
1637 #endif /* SVR4 */
1638 #ifdef FREEBSD
1639                 if (regs.r_eflags & PSL_C) {
1640                         tcp->u_rval = -1;
1641                         u_error = regs.r_eax;
1642                 } else {
1643                         tcp->u_rval = regs.r_eax;
1644                         tcp->u_lrval =
1645                           ((unsigned long long) regs.r_edx << 32) +  regs.r_eax;
1646                         u_error = 0;
1647                 }
1648 #endif /* FREEBSD */
1649         tcp->u_error = u_error;
1650         return 1;
1651 }
1652
1653 int
1654 force_result(tcp, error, rval)
1655         struct tcb *tcp;
1656         int error;
1657         long rval;
1658 {
1659 #ifdef LINUX
1660 #if defined(S390) || defined(S390X)
1661         gpr2 = error ? -error : rval;
1662         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)PT_GPR2, gpr2) < 0)
1663                 return -1;
1664 #else /* !S390 && !S390X */
1665 #ifdef I386
1666         eax = error ? -error : rval;
1667         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(EAX * 4), eax) < 0)
1668                 return -1;
1669 #else /* !I386 */
1670 #ifdef X86_64
1671         rax = error ? -error : rval;
1672         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(RAX * 8), rax) < 0)
1673                 return -1;
1674 #else
1675 #ifdef IA64
1676         if (ia32) {
1677                 r8 = error ? -error : rval;
1678                 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R8), r8) < 0)
1679                         return -1;
1680         }
1681         else {
1682                 if (error) {
1683                         r8 = error;
1684                         r10 = -1;
1685                 }
1686                 else {
1687                         r8 = rval;
1688                         r10 = 0;
1689                 }
1690                 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R8), r8) < 0 ||
1691                     ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R10), r10) < 0)
1692                         return -1;
1693         }
1694 #else /* !IA64 */
1695 #ifdef MIPS
1696         if (error) {
1697                 r2 = error;
1698                 a3 = -1;
1699         }
1700         else {
1701                 r2 = rval;
1702                 a3 = 0;
1703         }
1704         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), a3) < 0 ||
1705             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_V0), r2) < 0)
1706                 return -1;
1707 #else
1708 #ifdef POWERPC
1709         if (upeek(tcp->pid, sizeof(unsigned long)*PT_CCR, &flags) < 0)
1710                 return -1;
1711         if (error) {
1712                 flags |= SO_MASK;
1713                 result = error;
1714         }
1715         else {
1716                 flags &= ~SO_MASK;
1717                 result = rval;
1718         }
1719         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(sizeof(unsigned long)*PT_CCR), flags) < 0 ||
1720             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(sizeof(unsigned long)*PT_R3), result) < 0)
1721                 return -1;
1722 #else /* !POWERPC */
1723 #ifdef M68K
1724         d0 = error ? -error : rval;
1725         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_D0), d0) < 0)
1726                 return -1;
1727 #else /* !M68K */
1728 #ifdef ARM
1729        regs.ARM_r0 = error ? -error : rval;
1730        if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*0), regs.ARM_r0) < 0)
1731                 return -1;
1732 #else /* !ARM */
1733 #ifdef ALPHA
1734         if (error) {
1735                 a3 = -1;
1736                 r0 = error;
1737         }
1738         else {
1739                 a3 = 0;
1740                 r0 = rval;
1741         }
1742         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), a3) < 0 ||
1743             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_R0), r0) < 0)
1744                 return -1;
1745 #else /* !ALPHA */
1746 #ifdef SPARC
1747         if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0)
1748                 return -1;
1749         if (error) {
1750                 regs.r_psr |= PSR_C;
1751                 regs.r_o0 = error;
1752         }
1753         else {
1754                 regs.r_psr &= ~PSR_C;
1755                 regs.r_o0 = rval;
1756         }
1757         if (ptrace(PTRACE_SETREGS, tcp->pid, (char *)&regs, 0) < 0)
1758                 return -1;
1759 #else /* !SPARC */
1760 #ifdef SPARC64
1761         if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0)
1762                 return -1;
1763         if (error) {
1764                 regs.r_tstate |= 0x1100000000UL;
1765                 regs.r_o0 = error;
1766         }
1767         else {
1768                 regs.r_tstate &= ~0x1100000000UL;
1769                 regs.r_o0 = rval;
1770         }
1771         if (ptrace(PTRACE_SETREGS, tcp->pid, (char *)&regs, 0) < 0)
1772                 return -1;
1773 #else /* !SPARC64 */
1774 #ifdef HPPA
1775         r28 = error ? -error : rval;
1776         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GR28), r28) < 0)
1777                 return -1;
1778 #else
1779 #ifdef SH
1780         r0 = error ? -error : rval;
1781         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*REG_REG0), r0) < 0)
1782                 return -1;
1783 #else
1784 #ifdef SH64
1785         r9 = error ? -error : rval;
1786         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)REG_GENERAL(9), r9) < 0)
1787                 return -1;
1788 #endif /* SH64 */
1789 #endif /* SH */
1790 #endif /* HPPA */
1791 #endif /* SPARC */
1792 #endif /* SPARC64 */
1793 #endif /* ALPHA */
1794 #endif /* ARM */
1795 #endif /* M68K */
1796 #endif /* POWERPC */
1797 #endif /* MIPS */
1798 #endif /* IA64 */
1799 #endif /* X86_64 */
1800 #endif /* I386 */
1801 #endif /* S390 || S390X */
1802 #endif /* LINUX */
1803 #ifdef SUNOS4
1804         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)uoff(u_error),
1805                    error << 24) < 0 ||
1806             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)uoff(u_rval1), rval) < 0)
1807                 return -1;
1808 #endif /* SUNOS4 */
1809 #ifdef SVR4
1810         /* XXX no clue */
1811         return -1;
1812 #endif /* SVR4 */
1813 #ifdef FREEBSD
1814         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1815                 perror("pread");
1816                 return -1;
1817         }
1818         if (error) {
1819                 regs.r_eflags |= PSL_C;
1820                 regs.r_eax = error;
1821         }
1822         else {
1823                 regs.r_eflags &= ~PSL_C;
1824                 regs.r_eax = rval;
1825         }
1826         if (pwrite(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1827                 perror("pwrite");
1828                 return -1;
1829         }
1830 #endif /* FREEBSD */
1831
1832         /* All branches reach here on success (only).  */
1833         tcp->u_error = error;
1834         tcp->u_rval = rval;
1835         return 0;
1836 }
1837
1838 int syscall_enter(tcp)
1839 struct tcb *tcp;
1840 {
1841 #ifndef USE_PROCFS
1842         int pid = tcp->pid;
1843 #endif /* !USE_PROCFS */
1844 #ifdef LINUX
1845 #if defined(S390) || defined(S390X)
1846         {
1847                 int i;
1848                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1849                         tcp->u_nargs = sysent[tcp->scno].nargs;
1850                 else
1851                         tcp->u_nargs = MAX_ARGS;
1852                 for (i = 0; i < tcp->u_nargs; i++) {
1853                         if (upeek(pid,i==0 ? PT_ORIGGPR2:PT_GPR2+i*sizeof(long), &tcp->u_arg[i]) < 0)
1854                                 return -1;
1855                 }
1856         }
1857 #elif defined (ALPHA)
1858         {
1859                 int i;
1860                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1861                         tcp->u_nargs = sysent[tcp->scno].nargs;
1862                 else
1863                         tcp->u_nargs = MAX_ARGS;
1864                 for (i = 0; i < tcp->u_nargs; i++) {
1865                         /* WTA: if scno is out-of-bounds this will bomb. Add range-check
1866                          * for scno somewhere above here!
1867                          */
1868                         if (upeek(pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1869                                 return -1;
1870                 }
1871         }
1872 #elif defined (IA64)
1873         {
1874                 if (!ia32) {
1875                         unsigned long *out0, *rbs_end, cfm, sof, sol, i;
1876                         /* be backwards compatible with kernel < 2.4.4... */
1877 #                       ifndef PT_RBS_END
1878 #                         define PT_RBS_END     PT_AR_BSP
1879 #                       endif
1880
1881                         if (upeek(pid, PT_RBS_END, (long *) &rbs_end) < 0)
1882                                 return -1;
1883                         if (upeek(pid, PT_CFM, (long *) &cfm) < 0)
1884                                 return -1;
1885
1886                         sof = (cfm >> 0) & 0x7f;
1887                         sol = (cfm >> 7) & 0x7f;
1888                         out0 = ia64_rse_skip_regs(rbs_end, -sof + sol);
1889
1890                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1891                             && sysent[tcp->scno].nargs != -1)
1892                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1893                         else
1894                                 tcp->u_nargs = MAX_ARGS;
1895                         for (i = 0; i < tcp->u_nargs; ++i) {
1896                                 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1897                                            sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1898                                         return -1;
1899                         }
1900                 } else {
1901                         int i;
1902
1903                         if (/* EBX = out0 */
1904                             upeek(pid, PT_R11, (long *) &tcp->u_arg[0]) < 0
1905                             /* ECX = out1 */
1906                             || upeek(pid, PT_R9,  (long *) &tcp->u_arg[1]) < 0
1907                             /* EDX = out2 */
1908                             || upeek(pid, PT_R10, (long *) &tcp->u_arg[2]) < 0
1909                             /* ESI = out3 */
1910                             || upeek(pid, PT_R14, (long *) &tcp->u_arg[3]) < 0
1911                             /* EDI = out4 */
1912                             || upeek(pid, PT_R15, (long *) &tcp->u_arg[4]) < 0
1913                             /* EBP = out5 */
1914                             || upeek(pid, PT_R13, (long *) &tcp->u_arg[5]) < 0)
1915                                 return -1;
1916
1917                         for (i = 0; i < 6; ++i)
1918                                 /* truncate away IVE sign-extension */
1919                                 tcp->u_arg[i] &= 0xffffffff;
1920
1921                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1922                             && sysent[tcp->scno].nargs != -1)
1923                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1924                         else
1925                                 tcp->u_nargs = 5;
1926                 }
1927         }
1928 #elif defined (MIPS)
1929         {
1930                 long sp;
1931                 int i, nargs;
1932
1933                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1934                         nargs = tcp->u_nargs = sysent[tcp->scno].nargs;
1935                 else
1936                         nargs = tcp->u_nargs = MAX_ARGS;
1937                 if(nargs > 4) {
1938                         if(upeek(pid, REG_SP, &sp) < 0)
1939                                 return -1;
1940                         for(i = 0; i < 4; i++) {
1941                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i])<0)
1942                                         return -1;
1943                         }
1944                         umoven(tcp, sp+16, (nargs-4) * sizeof(tcp->u_arg[0]),
1945                                (char *)(tcp->u_arg + 4));
1946                 } else {
1947                         for(i = 0; i < nargs; i++) {
1948                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1949                                         return -1;
1950                         }
1951                 }
1952         }
1953 #elif defined (POWERPC)
1954 #ifndef PT_ORIG_R3
1955 #define PT_ORIG_R3 34
1956 #endif
1957         {
1958                 int i;
1959                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1960                         tcp->u_nargs = sysent[tcp->scno].nargs;
1961                 else
1962                         tcp->u_nargs = MAX_ARGS;
1963                 for (i = 0; i < tcp->u_nargs; i++) {
1964                         if (upeek(pid, (i==0) ?
1965                                 (sizeof(unsigned long)*PT_ORIG_R3) :
1966                                 ((i+PT_R3)*sizeof(unsigned long)),
1967                                         &tcp->u_arg[i]) < 0)
1968                                 return -1;
1969                 }
1970         }
1971 #elif defined (SPARC) || defined (SPARC64)
1972         {
1973                 int i;
1974
1975                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1976                         tcp->u_nargs = sysent[tcp->scno].nargs;
1977                 else
1978                         tcp->u_nargs = MAX_ARGS;
1979                 for (i = 0; i < tcp->u_nargs; i++)
1980                         tcp->u_arg[i] = *((&regs.r_o0) + i);
1981         }
1982 #elif defined (HPPA)
1983         {
1984                 int i;
1985
1986                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1987                         tcp->u_nargs = sysent[tcp->scno].nargs;
1988                 else
1989                         tcp->u_nargs = MAX_ARGS;
1990                 for (i = 0; i < tcp->u_nargs; i++) {
1991                         if (upeek(pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1992                                 return -1;
1993                 }
1994         }
1995 #elif defined(ARM)
1996         {
1997                 int i;
1998
1999                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2000                         tcp->u_nargs = sysent[tcp->scno].nargs;
2001                 else
2002                         tcp->u_nargs = MAX_ARGS;
2003                 for (i = 0; i < tcp->u_nargs; i++)
2004                         tcp->u_arg[i] = regs.uregs[i];
2005         }
2006 #elif defined(SH)
2007        {
2008                int i;
2009                static int syscall_regs[] = {
2010                    REG_REG0+4, REG_REG0+5, REG_REG0+6, REG_REG0+7,
2011                    REG_REG0, REG_REG0+1, REG_REG0+2
2012                    };
2013
2014                tcp->u_nargs = sysent[tcp->scno].nargs;
2015                for (i = 0; i < tcp->u_nargs; i++) {
2016                        if (upeek(pid, 4*syscall_regs[i], &tcp->u_arg[i]) < 0)
2017                                return -1;
2018                }
2019         }
2020 #elif defined(SH64)
2021         {
2022                 int i;
2023                 /* Registers used by SH5 Linux system calls for parameters */
2024                 static int syscall_regs[] = { 2, 3, 4, 5, 6, 7 };
2025
2026                 /*
2027                  * TODO: should also check that the number of arguments encoded
2028                  *       in the trap number matches the number strace expects.
2029                  */
2030                 /*
2031                     assert(sysent[tcp->scno].nargs <
2032                         sizeof(syscall_regs)/sizeof(syscall_regs[0]));
2033                  */
2034
2035                 tcp->u_nargs = sysent[tcp->scno].nargs;
2036                 for (i = 0; i < tcp->u_nargs; i++) {
2037                         if (upeek(pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
2038                                 return -1;
2039                 }
2040         }
2041
2042 #elif defined(X86_64)
2043         {
2044                 int i;
2045                 static int argreg[SUPPORTED_PERSONALITIES][MAX_ARGS] = {
2046                         {RDI,RSI,RDX,R10,R8,R9},        /* x86-64 ABI */
2047                         {RBX,RCX,RDX,RSI,RDI,RBP}       /* i386 ABI */
2048                 };
2049
2050                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2051                         tcp->u_nargs = sysent[tcp->scno].nargs;
2052                 else
2053                         tcp->u_nargs = MAX_ARGS;
2054                 for (i = 0; i < tcp->u_nargs; i++) {
2055                         if (upeek(pid, argreg[current_personality][i]*8, &tcp->u_arg[i]) < 0)
2056                                 return -1;
2057                 }
2058         }
2059 #else /* Other architecture (like i386) (32bits specific) */
2060         {
2061                 int i;
2062                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2063                         tcp->u_nargs = sysent[tcp->scno].nargs;
2064                 else
2065                         tcp->u_nargs = MAX_ARGS;
2066                 for (i = 0; i < tcp->u_nargs; i++) {
2067                         if (upeek(pid, i*4, &tcp->u_arg[i]) < 0)
2068                                 return -1;
2069                 }
2070         }
2071 #endif
2072 #endif /* LINUX */
2073 #ifdef SUNOS4
2074         {
2075                 int i;
2076                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2077                         tcp->u_nargs = sysent[tcp->scno].nargs;
2078                 else
2079                         tcp->u_nargs = MAX_ARGS;
2080                 for (i = 0; i < tcp->u_nargs; i++) {
2081                         struct user *u;
2082
2083                         if (upeek(pid, uoff(u_arg[0]) +
2084                             (i*sizeof(u->u_arg[0])), &tcp->u_arg[i]) < 0)
2085                                 return -1;
2086                 }
2087         }
2088 #endif /* SUNOS4 */
2089 #ifdef SVR4
2090 #ifdef MIPS
2091         /*
2092          * SGI is broken: even though it has pr_sysarg, it doesn't
2093          * set them on system call entry.  Get a clue.
2094          */
2095         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2096                 tcp->u_nargs = sysent[tcp->scno].nargs;
2097         else
2098                 tcp->u_nargs = tcp->status.pr_nsysarg;
2099         if (tcp->u_nargs > 4) {
2100                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
2101                         4*sizeof(tcp->u_arg[0]));
2102                 umoven(tcp, tcp->status.pr_reg[CTX_SP] + 16,
2103                         (tcp->u_nargs - 4)*sizeof(tcp->u_arg[0]), (char *) (tcp->u_arg + 4));
2104         }
2105         else {
2106                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
2107                         tcp->u_nargs*sizeof(tcp->u_arg[0]));
2108         }
2109 #elif UNIXWARE >= 2
2110         /*
2111          * Like SGI, UnixWare doesn't set pr_sysarg until system call exit
2112          */
2113         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2114                 tcp->u_nargs = sysent[tcp->scno].nargs;
2115         else
2116                 tcp->u_nargs = tcp->status.pr_lwp.pr_nsysarg;
2117         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
2118                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
2119 #elif defined (HAVE_PR_SYSCALL)
2120         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2121                 tcp->u_nargs = sysent[tcp->scno].nargs;
2122         else
2123                 tcp->u_nargs = tcp->status.pr_nsysarg;
2124         {
2125                 int i;
2126                 for (i = 0; i < tcp->u_nargs; i++)
2127                         tcp->u_arg[i] = tcp->status.pr_sysarg[i];
2128         }
2129 #elif defined (I386)
2130         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2131                 tcp->u_nargs = sysent[tcp->scno].nargs;
2132         else
2133                 tcp->u_nargs = 5;
2134         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
2135                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
2136 #else
2137         I DONT KNOW WHAT TO DO
2138 #endif /* !HAVE_PR_SYSCALL */
2139 #endif /* SVR4 */
2140 #ifdef FREEBSD
2141         if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
2142             sysent[tcp->scno].nargs > tcp->status.val)
2143                 tcp->u_nargs = sysent[tcp->scno].nargs;
2144         else
2145                 tcp->u_nargs = tcp->status.val;
2146         if (tcp->u_nargs < 0)
2147                 tcp->u_nargs = 0;
2148         if (tcp->u_nargs > MAX_ARGS)
2149                 tcp->u_nargs = MAX_ARGS;
2150         switch(regs.r_eax) {
2151         case SYS___syscall:
2152                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2153                       regs.r_esp + sizeof(int) + sizeof(quad_t));
2154           break;
2155         case SYS_syscall:
2156                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2157                       regs.r_esp + 2 * sizeof(int));
2158           break;
2159         default:
2160                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2161                       regs.r_esp + sizeof(int));
2162           break;
2163         }
2164 #endif /* FREEBSD */
2165         return 1;
2166 }
2167
2168 int
2169 trace_syscall(tcp)
2170 struct tcb *tcp;
2171 {
2172         int sys_res;
2173         struct timeval tv;
2174         int res;
2175
2176         /* Measure the exit time as early as possible to avoid errors. */
2177         if (dtime && (tcp->flags & TCB_INSYSCALL))
2178                 gettimeofday(&tv, NULL);
2179
2180         res = get_scno(tcp);
2181         if (res != 1)
2182                 return res;
2183
2184         res = syscall_fixup(tcp);
2185         if (res != 1)
2186                 return res;
2187
2188         if (tcp->flags & TCB_INSYSCALL) {
2189                 long u_error;
2190                 res = get_error(tcp);
2191                 if (res != 1)
2192                         return res;
2193
2194                 internal_syscall(tcp);
2195                 if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
2196                     !(qual_flags[tcp->scno] & QUAL_TRACE)) {
2197                         tcp->flags &= ~TCB_INSYSCALL;
2198                         return 0;
2199                 }
2200
2201                 if (tcp->flags & TCB_REPRINT) {
2202                         printleader(tcp);
2203                         tprintf("<... ");
2204                         if (tcp->scno >= nsyscalls || tcp->scno < 0)
2205                                 tprintf("syscall_%lu", tcp->scno);
2206                         else
2207                                 tprintf("%s", sysent[tcp->scno].sys_name);
2208                         tprintf(" resumed> ");
2209                 }
2210
2211                 if (cflag && tcp->scno < nsyscalls && tcp->scno >= 0) {
2212                         if (counts == NULL) {
2213                                 counts = calloc(sizeof *counts, nsyscalls);
2214                                 if (counts == NULL) {
2215                                         fprintf(stderr, "\
2216 strace: out of memory for call counts\n");
2217                                         exit(1);
2218                                 }
2219                         }
2220
2221                         counts[tcp->scno].calls++;
2222                         if (tcp->u_error)
2223                                 counts[tcp->scno].errors++;
2224                         tv_sub(&tv, &tv, &tcp->etime);
2225 #ifdef LINUX
2226                         if (tv_cmp(&tv, &tcp->dtime) > 0) {
2227                                 static struct timeval one_tick;
2228                                 if (one_tick.tv_usec == 0) {
2229                                         /* Initialize it.  */
2230                                         struct itimerval it;
2231                                         memset(&it, 0, sizeof it);
2232                                         it.it_interval.tv_usec = 1;
2233                                         setitimer(ITIMER_REAL, &it, NULL);
2234                                         getitimer(ITIMER_REAL, &it);
2235                                         one_tick = it.it_interval;
2236                                 }
2237
2238                                 if (tv_nz(&tcp->dtime))
2239                                         tv = tcp->dtime;
2240                                 else if (tv_cmp(&tv, &one_tick) > 0) {
2241                                         if (tv_cmp(&shortest, &one_tick) < 0)
2242                                                 tv = shortest;
2243                                         else
2244                                                 tv = one_tick;
2245                                 }
2246                         }
2247 #endif /* LINUX */
2248                         if (tv_cmp(&tv, &shortest) < 0)
2249                                 shortest = tv;
2250                         tv_add(&counts[tcp->scno].time,
2251                                 &counts[tcp->scno].time, &tv);
2252                         tcp->flags &= ~TCB_INSYSCALL;
2253                         return 0;
2254                 }
2255
2256                 if (tcp->scno >= nsyscalls || tcp->scno < 0
2257                     || (qual_flags[tcp->scno] & QUAL_RAW))
2258                         sys_res = printargs(tcp);
2259                 else {
2260                         if (not_failing_only && tcp->u_error)
2261                                 return 0;       /* ignore failed syscalls */
2262                         sys_res = (*sysent[tcp->scno].sys_func)(tcp);
2263                 }
2264                 u_error = tcp->u_error;
2265                 tprintf(") ");
2266                 tabto(acolumn);
2267                 if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
2268                     qual_flags[tcp->scno] & QUAL_RAW) {
2269                         if (u_error)
2270                                 tprintf("= -1 (errno %ld)", u_error);
2271                         else
2272                                 tprintf("= %#lx", tcp->u_rval);
2273                 }
2274                 else if (!(sys_res & RVAL_NONE) && u_error) {
2275                         switch (u_error) {
2276 #ifdef LINUX
2277                         case ERESTARTSYS:
2278                                 tprintf("= ? ERESTARTSYS (To be restarted)");
2279                                 break;
2280                         case ERESTARTNOINTR:
2281                                 tprintf("= ? ERESTARTNOINTR (To be restarted)");
2282                                 break;
2283                         case ERESTARTNOHAND:
2284                                 tprintf("= ? ERESTARTNOHAND (To be restarted)");
2285                                 break;
2286                         case ERESTART_RESTARTBLOCK:
2287                                 tprintf("= ? ERESTART_RESTARTBLOCK (To be restarted)");
2288                                 break;
2289 #endif /* LINUX */
2290                         default:
2291                                 tprintf("= -1 ");
2292                                 if (u_error < 0)
2293                                         tprintf("E??? (errno %ld)", u_error);
2294                                 else if (u_error < nerrnos)
2295                                         tprintf("%s (%s)", errnoent[u_error],
2296                                                 strerror(u_error));
2297                                 else
2298                                         tprintf("ERRNO_%ld (%s)", u_error,
2299                                                 strerror(u_error));
2300                                 break;
2301                         }
2302                 }
2303                 else {
2304                         if (sys_res & RVAL_NONE)
2305                                 tprintf("= ?");
2306                         else {
2307                                 switch (sys_res & RVAL_MASK) {
2308                                 case RVAL_HEX:
2309                                         tprintf("= %#lx", tcp->u_rval);
2310                                         break;
2311                                 case RVAL_OCTAL:
2312                                         tprintf("= %#lo", tcp->u_rval);
2313                                         break;
2314                                 case RVAL_UDECIMAL:
2315                                         tprintf("= %lu", tcp->u_rval);
2316                                         break;
2317                                 case RVAL_DECIMAL:
2318                                         tprintf("= %ld", tcp->u_rval);
2319                                         break;
2320 #ifdef HAVE_LONG_LONG
2321                                 case RVAL_LHEX:
2322                                         tprintf("= %#llx", tcp->u_lrval);
2323                                         break;
2324                                 case RVAL_LOCTAL:
2325                                         tprintf("= %#llo", tcp->u_lrval);
2326                                         break;
2327                                 case RVAL_LUDECIMAL:
2328                                         tprintf("= %llu", tcp->u_lrval);
2329                                         break;
2330                                 case RVAL_LDECIMAL:
2331                                         tprintf("= %lld", tcp->u_lrval);
2332                                         break;
2333 #endif
2334                                 default:
2335                                         fprintf(stderr,
2336                                                 "invalid rval format\n");
2337                                         break;
2338                                 }
2339                         }
2340                         if ((sys_res & RVAL_STR) && tcp->auxstr)
2341                                 tprintf(" (%s)", tcp->auxstr);
2342                 }
2343                 if (dtime) {
2344                         tv_sub(&tv, &tv, &tcp->etime);
2345                         tprintf(" <%ld.%06ld>",
2346                                 (long) tv.tv_sec, (long) tv.tv_usec);
2347                 }
2348                 printtrailer(tcp);
2349
2350                 dumpio(tcp);
2351                 if (fflush(tcp->outf) == EOF)
2352                         return -1;
2353                 tcp->flags &= ~TCB_INSYSCALL;
2354                 return 0;
2355         }
2356
2357         /* Entering system call */
2358         res = syscall_enter(tcp);
2359         if (res != 1)
2360                 return res;
2361
2362         switch (tcp->scno + NR_SYSCALL_BASE) {
2363 #ifdef LINUX
2364 #if !defined (ALPHA) && !defined(SPARC) && !defined(SPARC64) && !defined(MIPS) && !defined(HPPA) && !defined(X86_64)
2365         case SYS_socketcall:
2366                 decode_subcall(tcp, SYS_socket_subcall,
2367                         SYS_socket_nsubcalls, deref_style);
2368                 break;
2369         case SYS_ipc:
2370                 decode_subcall(tcp, SYS_ipc_subcall,
2371                         SYS_ipc_nsubcalls, shift_style);
2372                 break;
2373 #endif /* !ALPHA && !MIPS && !SPARC && !SPARC64 && !HPPA && !X86_64 */
2374 #if defined (SPARC) || defined (SPARC64)
2375         case SYS_socketcall:
2376                 sparc_socket_decode (tcp);
2377                 break;
2378 #endif
2379 #endif /* LINUX */
2380 #ifdef SVR4
2381 #ifdef SYS_pgrpsys_subcall
2382         case SYS_pgrpsys:
2383                 decode_subcall(tcp, SYS_pgrpsys_subcall,
2384                         SYS_pgrpsys_nsubcalls, shift_style);
2385                 break;
2386 #endif /* SYS_pgrpsys_subcall */
2387 #ifdef SYS_sigcall_subcall
2388         case SYS_sigcall:
2389                 decode_subcall(tcp, SYS_sigcall_subcall,
2390                         SYS_sigcall_nsubcalls, mask_style);
2391                 break;
2392 #endif /* SYS_sigcall_subcall */
2393         case SYS_msgsys:
2394                 decode_subcall(tcp, SYS_msgsys_subcall,
2395                         SYS_msgsys_nsubcalls, shift_style);
2396                 break;
2397         case SYS_shmsys:
2398                 decode_subcall(tcp, SYS_shmsys_subcall,
2399                         SYS_shmsys_nsubcalls, shift_style);
2400                 break;
2401         case SYS_semsys:
2402                 decode_subcall(tcp, SYS_semsys_subcall,
2403                         SYS_semsys_nsubcalls, shift_style);
2404                 break;
2405 #if 0 /* broken */
2406         case SYS_utssys:
2407                 decode_subcall(tcp, SYS_utssys_subcall,
2408                         SYS_utssys_nsubcalls, shift_style);
2409                 break;
2410 #endif
2411         case SYS_sysfs:
2412                 decode_subcall(tcp, SYS_sysfs_subcall,
2413                         SYS_sysfs_nsubcalls, shift_style);
2414                 break;
2415         case SYS_spcall:
2416                 decode_subcall(tcp, SYS_spcall_subcall,
2417                         SYS_spcall_nsubcalls, shift_style);
2418                 break;
2419 #ifdef SYS_context_subcall
2420         case SYS_context:
2421                 decode_subcall(tcp, SYS_context_subcall,
2422                         SYS_context_nsubcalls, shift_style);
2423                 break;
2424 #endif /* SYS_context_subcall */
2425 #ifdef SYS_door_subcall
2426         case SYS_door:
2427                 decode_subcall(tcp, SYS_door_subcall,
2428                         SYS_door_nsubcalls, door_style);
2429                 break;
2430 #endif /* SYS_door_subcall */
2431 #ifdef SYS_kaio_subcall
2432         case SYS_kaio:
2433                 decode_subcall(tcp, SYS_kaio_subcall,
2434                         SYS_kaio_nsubcalls, shift_style);
2435                 break;
2436 #endif
2437 #endif /* SVR4 */
2438 #ifdef FREEBSD
2439         case SYS_msgsys:
2440         case SYS_shmsys:
2441         case SYS_semsys:
2442                 decode_subcall(tcp, 0, 0, table_style);
2443                 break;
2444 #endif
2445 #ifdef SUNOS4
2446         case SYS_semsys:
2447                 decode_subcall(tcp, SYS_semsys_subcall,
2448                         SYS_semsys_nsubcalls, shift_style);
2449                 break;
2450         case SYS_msgsys:
2451                 decode_subcall(tcp, SYS_msgsys_subcall,
2452                         SYS_msgsys_nsubcalls, shift_style);
2453                 break;
2454         case SYS_shmsys:
2455                 decode_subcall(tcp, SYS_shmsys_subcall,
2456                         SYS_shmsys_nsubcalls, shift_style);
2457                 break;
2458 #endif
2459         }
2460
2461         internal_syscall(tcp);
2462         if (tcp->scno >=0 && tcp->scno < nsyscalls && !(qual_flags[tcp->scno] & QUAL_TRACE)) {
2463                 tcp->flags |= TCB_INSYSCALL;
2464                 return 0;
2465         }
2466
2467         if (cflag) {
2468                 gettimeofday(&tcp->etime, NULL);
2469                 tcp->flags |= TCB_INSYSCALL;
2470                 return 0;
2471         }
2472
2473         printleader(tcp);
2474         tcp->flags &= ~TCB_REPRINT;
2475         tcp_last = tcp;
2476         if (tcp->scno >= nsyscalls || tcp->scno < 0)
2477                 tprintf("syscall_%lu(", tcp->scno);
2478         else
2479                 tprintf("%s(", sysent[tcp->scno].sys_name);
2480         if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
2481             ((qual_flags[tcp->scno] & QUAL_RAW) && tcp->scno != SYS_exit))
2482                 sys_res = printargs(tcp);
2483         else
2484                 sys_res = (*sysent[tcp->scno].sys_func)(tcp);
2485         if (fflush(tcp->outf) == EOF)
2486                 return -1;
2487         tcp->flags |= TCB_INSYSCALL;
2488         /* Measure the entrance time as late as possible to avoid errors. */
2489         if (dtime)
2490                 gettimeofday(&tcp->etime, NULL);
2491         return sys_res;
2492 }
2493
2494 int
2495 printargs(tcp)
2496 struct tcb *tcp;
2497 {
2498         if (entering(tcp)) {
2499                 int i;
2500
2501                 for (i = 0; i < tcp->u_nargs; i++)
2502                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
2503         }
2504         return 0;
2505 }
2506
2507 long
2508 getrval2(tcp)
2509 struct tcb *tcp;
2510 {
2511         long val = -1;
2512
2513 #ifdef LINUX
2514 #if defined (SPARC) || defined (SPARC64)
2515         struct regs regs;
2516         if (ptrace(PTRACE_GETREGS,tcp->pid,(char *)&regs,0) < 0)
2517                 return -1;
2518         val = regs.r_o1;
2519 #elif defined(SH)
2520         if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0)
2521                 return -1;
2522 #endif /* SPARC || SPARC64 */
2523 #elif defined(IA64)
2524         if (upeek(tcp->pid, PT_R9, &val) < 0)
2525                 return -1;
2526 #endif /* LINUX */
2527
2528 #ifdef SUNOS4
2529         if (upeek(tcp->pid, uoff(u_rval2), &val) < 0)
2530                 return -1;
2531 #endif /* SUNOS4 */
2532
2533 #ifdef SVR4
2534 #ifdef SPARC
2535         val = tcp->status.PR_REG[R_O1];
2536 #endif /* SPARC */
2537 #ifdef I386
2538         val = tcp->status.PR_REG[EDX];
2539 #endif /* I386 */
2540 #ifdef X86_64
2541         val = tcp->status.PR_REG[RDX];
2542 #endif /* X86_64 */
2543 #ifdef MIPS
2544         val = tcp->status.PR_REG[CTX_V1];
2545 #endif /* MIPS */
2546 #endif /* SVR4 */
2547 #ifdef FREEBSD
2548         struct reg regs;
2549         pread(tcp->pfd_reg, &regs, sizeof(regs), 0);
2550         val = regs.r_edx;
2551 #endif
2552         return val;
2553 }
2554
2555 /*
2556  * Apparently, indirect system calls have already be converted by ptrace(2),
2557  * so if you see "indir" this program has gone astray.
2558  */
2559 int
2560 sys_indir(tcp)
2561 struct tcb *tcp;
2562 {
2563         int i, scno, nargs;
2564
2565         if (entering(tcp)) {
2566                 if ((scno = tcp->u_arg[0]) > nsyscalls) {
2567                         fprintf(stderr, "Bogus syscall: %u\n", scno);
2568                         return 0;
2569                 }
2570                 nargs = sysent[scno].nargs;
2571                 tprintf("%s", sysent[scno].sys_name);
2572                 for (i = 0; i < nargs; i++)
2573                         tprintf(", %#lx", tcp->u_arg[i+1]);
2574         }
2575         return 0;
2576 }
2577
2578 static int
2579 time_cmp(a, b)
2580 void *a;
2581 void *b;
2582 {
2583         return -tv_cmp(&counts[*((int *) a)].time, &counts[*((int *) b)].time);
2584 }
2585
2586 static int
2587 syscall_cmp(a, b)
2588 void *a;
2589 void *b;
2590 {
2591         return strcmp(sysent[*((int *) a)].sys_name,
2592                 sysent[*((int *) b)].sys_name);
2593 }
2594
2595 static int
2596 count_cmp(a, b)
2597 void *a;
2598 void *b;
2599 {
2600         int m = counts[*((int *) a)].calls, n = counts[*((int *) b)].calls;
2601
2602         return (m < n) ? 1 : (m > n) ? -1 : 0;
2603 }
2604
2605 static int (*sortfun)();
2606 static struct timeval overhead = { -1, -1 };
2607
2608 void
2609 set_sortby(sortby)
2610 char *sortby;
2611 {
2612         if (strcmp(sortby, "time") == 0)
2613                 sortfun = time_cmp;
2614         else if (strcmp(sortby, "calls") == 0)
2615                 sortfun = count_cmp;
2616         else if (strcmp(sortby, "name") == 0)
2617                 sortfun = syscall_cmp;
2618         else if (strcmp(sortby, "nothing") == 0)
2619                 sortfun = NULL;
2620         else {
2621                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
2622                 exit(1);
2623         }
2624 }
2625
2626 void set_overhead(n)
2627 int n;
2628 {
2629         overhead.tv_sec = n / 1000000;
2630         overhead.tv_usec = n % 1000000;
2631 }
2632
2633 void
2634 call_summary(outf)
2635 FILE *outf;
2636 {
2637         int i, j;
2638         int call_cum, error_cum;
2639         struct timeval tv_cum, dtv;
2640         double percent;
2641         char *dashes = "-------------------------";
2642         char error_str[16];
2643
2644         int *sorted_count = malloc(nsyscalls * sizeof(int));
2645
2646         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
2647         if (overhead.tv_sec == -1) {
2648                 tv_mul(&overhead, &shortest, 8);
2649                 tv_div(&overhead, &overhead, 10);
2650         }
2651         for (i = 0; i < nsyscalls; i++) {
2652                 sorted_count[i] = i;
2653                 if (counts == NULL || counts[i].calls == 0)
2654                         continue;
2655                 tv_mul(&dtv, &overhead, counts[i].calls);
2656                 tv_sub(&counts[i].time, &counts[i].time, &dtv);
2657                 call_cum += counts[i].calls;
2658                 error_cum += counts[i].errors;
2659                 tv_add(&tv_cum, &tv_cum, &counts[i].time);
2660         }
2661         if (counts && sortfun)
2662                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
2663         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
2664                 "% time", "seconds", "usecs/call",
2665                 "calls", "errors", "syscall");
2666         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2667                 dashes, dashes, dashes, dashes, dashes, dashes);
2668         if (counts) {
2669                 for (i = 0; i < nsyscalls; i++) {
2670                         j = sorted_count[i];
2671                         if (counts[j].calls == 0)
2672                                 continue;
2673                         tv_div(&dtv, &counts[j].time, counts[j].calls);
2674                         if (counts[j].errors)
2675                                 sprintf(error_str, "%d", counts[j].errors);
2676                         else
2677                                 error_str[0] = '\0';
2678                         percent = (100.0 * tv_float(&counts[j].time)
2679                                    / tv_float(&tv_cum));
2680                         fprintf(outf, "%6.2f %4ld.%06ld %11ld %9d %9.9s %s\n",
2681                                 percent, (long) counts[j].time.tv_sec,
2682                                 (long) counts[j].time.tv_usec,
2683                                 (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
2684                                 counts[j].calls,
2685                                 error_str, sysent[j].sys_name);
2686                 }
2687         }
2688         free(sorted_count);
2689
2690         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2691                 dashes, dashes, dashes, dashes, dashes, dashes);
2692         if (error_cum)
2693                 sprintf(error_str, "%d", error_cum);
2694         else
2695                 error_str[0] = '\0';
2696         fprintf(outf, "%6.6s %4ld.%06ld %11.11s %9d %9.9s %s\n",
2697                 "100.00", (long) tv_cum.tv_sec, (long) tv_cum.tv_usec, "",
2698                 call_cum, error_str, "total");
2699
2700 }