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 #include <asm/reg.h>
  47 #endif
  48
  49 #if HAVE_LINUX_PTRACE_H
  50 #undef PTRACE_SYSCALL
  51 #include <linux/ptrace.h>
  52 #endif
  53
  54 #ifdef HAVE_SYS_REG_H
  55 #include <sys/reg.h>
  56 #ifndef PTRACE_PEEKUSR
  57 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  58 #endif
  59 #endif
  60
  61 #ifndef SYS_ERRLIST_DECLARED
  62 extern int sys_nerr;
  63 extern char *sys_errlist[];
  64 #endif /* SYS_ERRLIST_DECLARED */
  65
  66 #ifdef LINUX
  67 #ifndef ERESTARTSYS
  68 #define ERESTARTSYS     512
  69 #endif
  70 #ifndef ERESTARTNOINTR
  71 #define ERESTARTNOINTR  513
  72 #endif
  73 #ifndef ERESTARTNOHAND
  74 #define ERESTARTNOHAND  514     /* restart if no handler.. */
  75 #endif
  76 #ifndef ENOIOCTLCMD
  77 #define ENOIOCTLCMD     515     /* No ioctl command */
  78 #endif
  79 #ifndef NSIG
  80 #define NSIG 32
  81 #endif
  82 #ifdef ARM
  83 #undef NSIG
  84 #define NSIG 32
  85 #endif
  86 #endif /* LINUX */
  87
  88 #include "syscall.h"
  89
  90 /* Define these shorthand notations to simplify the syscallent files. */
  91 #define TF TRACE_FILE
  92 #define TI TRACE_IPC
  93 #define TN TRACE_NETWORK
  94 #define TP TRACE_PROCESS
  95 #define TS TRACE_SIGNAL
  96
  97 struct sysent sysent0[] = {
  98 #include "syscallent.h"
  99 };
 100 int nsyscalls0 = sizeof sysent0 / sizeof sysent0[0];
 101
 102 #if SUPPORTED_PERSONALITIES >= 2
 103 struct sysent sysent1[] = {
 104 #include "syscallent1.h"
 105 };
 106 int nsyscalls1 = sizeof sysent1 / sizeof sysent1[0];
 107 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 108
 109 #if SUPPORTED_PERSONALITIES >= 3
 110 struct sysent sysent2[] = {
 111 #include "syscallent2.h"
 112 };
 113 int nsyscalls2 = sizeof sysent2 / sizeof sysent2[0];
 114 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 115
 116 struct sysent *sysent;
 117 int nsyscalls;
 118
 119 /* Now undef them since short defines cause wicked namespace pollution. */
 120 #undef TF
 121 #undef TI
 122 #undef TN
 123 #undef TP
 124 #undef TS
 125
 126 char *errnoent0[] = {
 127 #include "errnoent.h"
 128 };
 129 int nerrnos0 = sizeof errnoent0 / sizeof errnoent0[0];
 130
 131 #if SUPPORTED_PERSONALITIES >= 2
 132 char *errnoent1[] = {
 133 #include "errnoent1.h"
 134 };
 135 int nerrnos1 = sizeof errnoent1 / sizeof errnoent1[0];
 136 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 137
 138 #if SUPPORTED_PERSONALITIES >= 3
 139 char *errnoent2[] = {
 140 #include "errnoent2.h"
 141 };
 142 int nerrnos2 = sizeof errnoent2 / sizeof errnoent2[0];
 143 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 144
 145 char **errnoent;
 146 int nerrnos;
 147
 148 int current_personality;
 149
 150 int
 151 set_personality(personality)
 152 int personality;
 153 {
 154         switch (personality) {
 155         case 0:
 156                 errnoent = errnoent0;
 157                 nerrnos = nerrnos0;
 158                 sysent = sysent0;
 159                 nsyscalls = nsyscalls0;
 160                 ioctlent = ioctlent0;
 161                 nioctlents = nioctlents0;
 162                 signalent = signalent0;
 163                 nsignals = nsignals0;
 164                 break;
 165
 166 #if SUPPORTED_PERSONALITIES >= 2
 167         case 1:
 168                 errnoent = errnoent1;
 169                 nerrnos = nerrnos1;
 170                 sysent = sysent1;
 171                 nsyscalls = nsyscalls1;
 172                 ioctlent = ioctlent1;
 173                 nioctlents = nioctlents1;
 174                 signalent = signalent1;
 175                 nsignals = nsignals1;
 176                 break;
 177 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 178
 179 #if SUPPORTED_PERSONALITIES >= 3
 180         case 2:
 181                 errnoent = errnoent2;
 182                 nerrnos = nerrnos2;
 183                 sysent = sysent2;
 184                 nsyscalls = nsyscalls2;
 185                 ioctlent = ioctlent2;
 186                 nioctlents = nioctlents2;
 187                 signalent = signalent2;
 188                 nsignals = nsignals2;
 189                 break;
 190 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 191
 192         default:
 193                 return -1;
 194         }
 195
 196         current_personality = personality;
 197         return 0;
 198 }
 199
 200 int qual_flags[MAX_QUALS];
 201
 202 static int call_count[MAX_QUALS];
 203 static int error_count[MAX_QUALS];
 204 static struct timeval tv_count[MAX_QUALS];
 205 static int sorted_count[MAX_QUALS];
 206
 207 static struct timeval shortest = { 1000000, 0 };
 208
 209 static int lookup_syscall(), lookup_signal(), lookup_fault(), lookup_desc();
 210
 211 static struct qual_options {
 212         int bitflag;
 213         char *option_name;
 214         int (*lookup)();
 215         char *argument_name;
 216 } qual_options[] = {
 217         { QUAL_TRACE,   "trace",        lookup_syscall, "system call"   },
 218         { QUAL_TRACE,   "t",            lookup_syscall, "system call"   },
 219         { QUAL_ABBREV,  "abbrev",       lookup_syscall, "system call"   },
 220         { QUAL_ABBREV,  "a",            lookup_syscall, "system call"   },
 221         { QUAL_VERBOSE, "verbose",      lookup_syscall, "system call"   },
 222         { QUAL_VERBOSE, "v",            lookup_syscall, "system call"   },
 223         { QUAL_RAW,     "raw",          lookup_syscall, "system call"   },
 224         { QUAL_RAW,     "x",            lookup_syscall, "system call"   },
 225         { QUAL_SIGNAL,  "signal",       lookup_signal,  "signal"        },
 226         { QUAL_SIGNAL,  "signals",      lookup_signal,  "signal"        },
 227         { QUAL_SIGNAL,  "s",            lookup_signal,  "signal"        },
 228         { QUAL_FAULT,   "fault",        lookup_fault,   "fault"         },
 229         { QUAL_FAULT,   "faults",       lookup_fault,   "fault"         },
 230         { QUAL_FAULT,   "m",            lookup_fault,   "fault"         },
 231         { QUAL_READ,    "read",         lookup_desc,    "descriptor"    },
 232         { QUAL_READ,    "reads",        lookup_desc,    "descriptor"    },
 233         { QUAL_READ,    "r",            lookup_desc,    "descriptor"    },
 234         { QUAL_WRITE,   "write",        lookup_desc,    "descriptor"    },
 235         { QUAL_WRITE,   "writes",       lookup_desc,    "descriptor"    },
 236         { QUAL_WRITE,   "w",            lookup_desc,    "descriptor"    },
 237         { 0,            NULL,           NULL,           NULL            },
 238 };
 239
 240 static int
 241 lookup_syscall(s)
 242 char *s;
 243 {
 244         int i;
 245
 246         for (i = 0; i < nsyscalls; i++) {
 247                 if (strcmp(s, sysent[i].sys_name) == 0)
 248                         return i;
 249         }
 250         return -1;
 251 }
 252
 253 static int
 254 lookup_signal(s)
 255 char *s;
 256 {
 257         int i;
 258         char buf[32];
 259
 260         if (s && *s && isdigit(*s))
 261                 return atoi(s);
 262         strcpy(buf, s);
 263         s = buf;
 264         for (i = 0; s[i]; i++)
 265                 s[i] = toupper(s[i]);
 266         if (strncmp(s, "SIG", 3) == 0)
 267                 s += 3;
 268         for (i = 0; i <= NSIG; i++) {
 269                 if (strcmp(s, signame(i) + 3) == 0)
 270                         return i;
 271         }
 272         return -1;
 273 }
 274
 275 static int
 276 lookup_fault(s)
 277 char *s;
 278 {
 279         return -1;
 280 }
 281
 282 static int
 283 lookup_desc(s)
 284 char *s;
 285 {
 286         if (s && *s && isdigit(*s))
 287                 return atoi(s);
 288         return -1;
 289 }
 290
 291 static int
 292 lookup_class(s)
 293 char *s;
 294 {
 295         if (strcmp(s, "file") == 0)
 296                 return TRACE_FILE;
 297         if (strcmp(s, "ipc") == 0)
 298                 return TRACE_IPC;
 299         if (strcmp(s, "network") == 0)
 300                 return TRACE_NETWORK;
 301         if (strcmp(s, "process") == 0)
 302                 return TRACE_PROCESS;
 303         if (strcmp(s, "signal") == 0)
 304                 return TRACE_SIGNAL;
 305         return -1;
 306 }
 307
 308 void
 309 qualify(s)
 310 char *s;
 311 {
 312         struct qual_options *opt;
 313         int not;
 314         char *p;
 315         int i, n;
 316
 317         opt = &qual_options[0];
 318         for (i = 0; (p = qual_options[i].option_name); i++) {
 319                 n = strlen(p);
 320                 if (strncmp(s, p, n) == 0 && s[n] == '=') {
 321                         opt = &qual_options[i];
 322                         s += n + 1;
 323                         break;
 324                 }
 325         }
 326         not = 0;
 327         if (*s == '!') {
 328                 not = 1;
 329                 s++;
 330         }
 331         if (strcmp(s, "none") == 0) {
 332                 not = 1 - not;
 333                 s = "all";
 334         }
 335         if (strcmp(s, "all") == 0) {
 336                 for (i = 0; i < MAX_QUALS; i++) {
 337                         if (not)
 338                                 qual_flags[i] &= ~opt->bitflag;
 339                         else
 340                                 qual_flags[i] |= opt->bitflag;
 341                 }
 342                 return;
 343         }
 344         for (i = 0; i < MAX_QUALS; i++) {
 345                 if (not)
 346                         qual_flags[i] |= opt->bitflag;
 347                 else
 348                         qual_flags[i] &= ~opt->bitflag;
 349         }
 350         for (p = strtok(s, ","); p; p = strtok(NULL, ",")) {
 351                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 352                         for (i = 0; i < MAX_QUALS; i++) {
 353                                 if (sysent[i].sys_flags & n) {
 354                                         if (not)
 355                                                 qual_flags[i] &= ~opt->bitflag;
 356                                         else
 357                                                 qual_flags[i] |= opt->bitflag;
 358                                 }
 359                         }
 360                         continue;
 361                 }
 362                 if ((n = (*opt->lookup)(p)) < 0) {
 363                         fprintf(stderr, "strace: invalid %s `%s'\n",
 364                                 opt->argument_name, p);
 365                         exit(1);
 366                 }
 367                 if (not)
 368                         qual_flags[n] &= ~opt->bitflag;
 369                 else
 370                         qual_flags[n] |= opt->bitflag;
 371         }
 372         return;
 373 }
 374
 375 static void
 376 dumpio(tcp)
 377 struct tcb *tcp;
 378 {
 379         if (syserror(tcp))
 380                 return;
 381         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= MAX_QUALS)
 382                 return;
 383 #ifdef __arm__
 384         switch (tcp->scno + __NR_SYSCALL_BASE) {
 385 #else
 386         switch (tcp->scno) {
 387 #endif
 388         case SYS_read:
 389 #ifdef SYS_recv
 390         case SYS_recv:
 391 #endif
 392 #ifdef SYS_recvfrom
 393         case SYS_recvfrom:
 394 #endif
 395                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 396                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 397                 break;
 398         case SYS_write:
 399 #ifdef SYS_send
 400         case SYS_send:
 401 #endif
 402 #ifdef SYS_sendto
 403         case SYS_sendto:
 404 #endif
 405                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 406                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 407                 break;
 408         }
 409 }
 410
 411 enum subcall_style { shift_style, deref_style, mask_style, door_style };
 412
 413 #if !(defined(LINUX) && ( defined(ALPHA) || defined(MIPS) ))
 414
 415 const int socket_map [] = {
 416                /* SYS_SOCKET      */ 97,
 417                /* SYS_BIND        */ 104,
 418                /* SYS_CONNECT     */ 98,
 419                /* SYS_LISTEN      */ 106,
 420                /* SYS_ACCEPT      */ 99,
 421                /* SYS_GETSOCKNAME */ 150,
 422                /* SYS_GETPEERNAME */ 141,
 423                /* SYS_SOCKETPAIR  */ 135,
 424                /* SYS_SEND        */ 101,
 425                /* SYS_RECV        */ 102,
 426                /* SYS_SENDTO      */ 133,
 427                /* SYS_RECVFROM    */ 125,
 428                /* SYS_SHUTDOWN    */ 134,
 429                /* SYS_SETSOCKOPT  */ 105,
 430                /* SYS_GETSOCKOPT  */ 118,
 431                /* SYS_SENDMSG     */ 114,
 432                /* SYS_RECVMSG     */ 113
 433 };
 434
 435 void
 436 sparc_socket_decode (tcp)
 437 struct tcb *tcp;
 438 {
 439         volatile long addr;
 440         volatile int i, n;
 441
 442         if (tcp->u_arg [0] < 1 || tcp->u_arg [0] > sizeof(socket_map)/sizeof(int)+1){
 443                 return;
 444         }
 445         tcp->scno = socket_map [tcp->u_arg [0]-1];
 446         n = tcp->u_nargs = sysent [tcp->scno].nargs;
 447         addr = tcp->u_arg [1];
 448         for (i = 0; i < n; i++){
 449                 int arg;
 450                 if (umoven (tcp, addr, sizeof (arg), (void *) &arg) < 0)
 451                         arg = 0;
 452                 tcp->u_arg [i] = arg;
 453                 addr += sizeof (arg);
 454         }
 455 }
 456
 457 static void
 458 decode_subcall(tcp, subcall, nsubcalls, style)
 459 struct tcb *tcp;
 460 int subcall;
 461 int nsubcalls;
 462 enum subcall_style style;
 463 {
 464         int i, addr, mask, arg;
 465
 466         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 467                 return;
 468         switch (style) {
 469         case shift_style:
 470                 tcp->scno = subcall + tcp->u_arg[0];
 471                 if (sysent[tcp->scno].nargs != -1)
 472                         tcp->u_nargs = sysent[tcp->scno].nargs;
 473                 else
 474                         tcp->u_nargs--;
 475                 for (i = 0; i < tcp->u_nargs; i++)
 476                         tcp->u_arg[i] = tcp->u_arg[i + 1];
 477                 break;
 478         case deref_style:
 479                 tcp->scno = subcall + tcp->u_arg[0];
 480                 addr = tcp->u_arg[1];
 481                 for (i = 0; i < sysent[tcp->scno].nargs; i++) {
 482                         if (umove(tcp, addr, &arg) < 0)
 483                                 arg = 0;
 484                         tcp->u_arg[i] = arg;
 485                         addr += sizeof(arg);
 486                 }
 487                 tcp->u_nargs = sysent[tcp->scno].nargs;
 488                 break;
 489         case mask_style:
 490                 mask = (tcp->u_arg[0] >> 8) & 0xff;
 491                 tcp->u_arg[0] &= 0xff;
 492                 for (i = 0; mask; i++)
 493                         mask >>= 1;
 494                 tcp->scno = subcall + i;
 495                 if (sysent[tcp->scno].nargs != -1)
 496                         tcp->u_nargs = sysent[tcp->scno].nargs;
 497                 break;
 498         case door_style:
 499                 /*
 500                  * Oh, yuck.  The call code is the *sixth* argument.
 501                  */
 502                 tcp->scno = subcall + tcp->u_arg[5];
 503                 if (sysent[tcp->scno].nargs != -1)
 504                         tcp->u_nargs = sysent[tcp->scno].nargs;
 505                 else
 506                         tcp->u_nargs--;
 507                 break;
 508         }
 509 }
 510 #endif
 511
 512 struct tcb *tcp_last = NULL;
 513
 514 static int
 515 internal_syscall(tcp)
 516 struct tcb *tcp;
 517 {
 518         /*
 519          * We must always trace a few critical system calls in order to
 520          * correctly support following forks in the presence of tracing
 521          * qualifiers.
 522          */
 523 #ifdef __arm__
 524         switch (tcp->scno + __NR_SYSCALL_BASE) {
 525 #else
 526         switch (tcp->scno) {
 527 #endif
 528 #ifdef SYS_fork
 529         case SYS_fork:
 530 #endif
 531 #ifdef SYS_vfork
 532         case SYS_vfork:
 533 #endif
 534 #ifdef SYS_clone
 535         case SYS_clone:
 536 #endif
 537                 internal_fork(tcp);
 538                 break;
 539
 540 #ifdef SYS_execv
 541         case SYS_execv:
 542 #endif
 543 #ifdef SYS_execve
 544         case SYS_execve:
 545 #endif
 546                 internal_exec(tcp);
 547                 break;
 548
 549 #ifdef SYS_wait
 550         case SYS_wait:
 551 #endif
 552 #ifdef SYS_wait4
 553         case SYS_wait4:
 554 #endif
 555 #ifdef SYS_waitpid
 556         case SYS_waitpid:
 557 #endif
 558 #ifdef SYS_waitsys
 559         case SYS_waitsys:
 560 #endif
 561                 internal_wait(tcp);
 562                 break;
 563
 564 #ifdef SYS_exit
 565         case SYS_exit:
 566 #endif
 567                 internal_exit(tcp);
 568                 break;
 569         }
 570         return 0;
 571 }
 572
 573 int
 574 trace_syscall(tcp)
 575 struct tcb *tcp;
 576 {
 577         int sys_res;
 578         struct timeval tv;
 579         long scno = 0;
 580 #ifdef LINUX
 581 #if defined (I386)
 582         long eax;
 583 #elif defined (POWERPC)
 584         long result,flags;
 585 #elif defined (M68K)
 586         int d0;
 587 #elif defined (ARM)
 588         int r0;
 589 #elif defined (ALPHA)
 590         long r0;
 591         long a3;
 592 #elif defined(MIPS)
 593         long r2,a3;
 594 #elif defined (SPARC)
 595         struct regs regs;
 596         unsigned long trap;
 597 #elif defined(S390)
 598         long gpr2;
 599         long pc;
 600 #endif
 601 #endif /* LINUX */
 602
 603 #ifndef SVR4
 604         int pid = tcp->pid;
 605 #endif /* !SVR4 */
 606
 607         /* Measure the exit time as early as possible to avoid errors. */
 608         if (dtime && (tcp->flags & TCB_INSYSCALL))
 609                 gettimeofday(&tv, NULL);
 610 #ifdef LINUX
 611 #if defined(S390)
 612         if (upeek(tcp->pid,PT_PSWADDR,&pc) < 0)
 613                 return -1;
 614         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(pc-4),0);
 615         if (errno)
 616                 return -1;
 617         scno&=0xFF;
 618 #elif defined (POWERPC)
 619         if (upeek(pid, 4*PT_R0, &scno) < 0)
 620                 return -1;
 621         if (!(tcp->flags & TCB_INSYSCALL)) {
 622                 /* Check if we return from execve. */
 623                 if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 624                         tcp->flags &= ~TCB_WAITEXECVE;
 625                         return 0;
 626                 }
 627         }
 628 #elif defined (I386)
 629         if (upeek(pid, 4*ORIG_EAX, &scno) < 0)
 630                 return -1;
 631 #elif defined (ARM)
 632         {
 633             long pc;
 634             upeek(pid, 4*15, &pc);
 635             umoven(tcp, pc-4, 4, (char *)&scno);
 636             scno &= 0x000fffff;
 637         }
 638 #elif defined (M68K)
 639         if (upeek(pid, 4*PT_ORIG_D0, &scno) < 0)
 640                 return -1;
 641 #elif defined (MIPS)
 642         if (upeek(pid, REG_A3, &a3) < 0)
 643                 return -1;
 644
 645         if(!(tcp->flags & TCB_INSYSCALL)) {
 646                 if (upeek(pid, REG_V0, &scno) < 0)
 647                         return -1;
 648
 649                 if (scno < 0 || scno > nsyscalls) {
 650                         if(a3 == 0 || a3 == -1) {
 651                                 if(debug)
 652                                         fprintf (stderr, "stray syscall exit: v0 = %ld\n", scno);
 653                                 return 0;
 654                         }
 655                 }
 656         } else {
 657                 if (upeek(pid, REG_V0, &r2) < 0)
 658                         return -1;
 659         }
 660 #elif defined (ALPHA)
 661         if (upeek(pid, REG_A3, &a3) < 0)
 662                 return -1;
 663
 664         if (!(tcp->flags & TCB_INSYSCALL)) {
 665                 if (upeek(pid, REG_R0, &scno) < 0)
 666                         return -1;
 667
 668                 /* Check if we return from execve. */
 669                 if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
 670                         tcp->flags &= ~TCB_WAITEXECVE;
 671                         return 0;
 672                 }
 673
 674                 /*
 675                  * Do some sanity checks to figure out if it's
 676                  * really a syscall entry
 677                  */
 678                 if (scno < 0 || scno > nsyscalls) {
 679                         if (a3 == 0 || a3 == -1) {
 680                                 if (debug)
 681                                         fprintf (stderr, "stray syscall exit: r0 = %ld\n", scno);
 682                                 return 0;
 683                         }
 684                 }
 685         }
 686         else {
 687                 if (upeek(pid, REG_R0, &r0) < 0)
 688                         return -1;
 689         }
 690 #elif defined (SPARC)
 691         /* Everything we need is in the current register set. */
 692         if (ptrace(PTRACE_GETREGS,pid,(char *)&regs,0) < 0)
 693                 return -1;
 694
 695         /* If we are entering, then disassemble the syscall trap. */
 696         if (!(tcp->flags & TCB_INSYSCALL)) {
 697                 /* Retrieve the syscall trap instruction. */
 698                 errno = 0;
 699                 trap = ptrace(PTRACE_PEEKTEXT,pid,(char *)regs.r_pc,0);
 700                 if (errno)
 701                         return -1;
 702
 703                 /* Disassemble the trap to see what personality to use. */
 704                 switch (trap) {
 705                 case 0x91d02010:
 706                         /* Linux/SPARC syscall trap. */
 707                         set_personality(0);
 708                         break;
 709                 case 0x91d0206d:
 710                         /* Linux/SPARC64 syscall trap. */
 711                         fprintf(stderr,"syscall: Linux/SPARC64 not supported yet\n");
 712                         return -1;
 713                 case 0x91d02000:
 714                         /* SunOS syscall trap. (pers 1) */
 715                         fprintf(stderr,"syscall: SunOS no support\n");
 716                         return -1;
 717                 case 0x91d02008:
 718                         /* Solaris 2.x syscall trap. (per 2) */
 719                         set_personality(1);
 720                         break;
 721                 case 0x91d02009:
 722                         /* NetBSD/FreeBSD syscall trap. */
 723                         fprintf(stderr,"syscall: NetBSD/FreeBSD not supported\n");
 724                         return -1;
 725                 case 0x91d02027:
 726                         /* Solaris 2.x gettimeofday */
 727                         set_personality(1);
 728                         break;
 729                 default:
 730                         /* Unknown syscall trap. */
 731                         if(tcp->flags & TCB_WAITEXECVE) {
 732                                 tcp->flags &= ~TCB_WAITEXECVE;
 733                                 return 0;
 734                         }
 735                         fprintf(stderr,"syscall: unknown syscall trap %08x %08x\n", trap, regs.r_pc);
 736                         return -1;
 737                 }
 738
 739                 /* Extract the system call number from the registers. */
 740                 if (trap == 0x91d02027)
 741                         scno = 156;
 742                 else
 743                         scno = regs.r_g1;
 744                 if (scno == 0) {
 745                         scno = regs.r_o0;
 746                         memmove (&regs.r_o0, &regs.r_o1, 7*sizeof(regs.r_o0));
 747                 }
 748         }
 749 #endif
 750 #endif /* LINUX */
 751 #ifdef SUNOS4
 752         if (upeek(pid, uoff(u_arg[7]), &scno) < 0)
 753                 return -1;
 754 #endif
 755 #ifdef SVR4
 756 #ifdef HAVE_PR_SYSCALL
 757         scno = tcp->status.pr_syscall;
 758 #else /* !HAVE_PR_SYSCALL */
 759         scno = tcp->status.PR_WHAT;
 760 #endif /* !HAVE_PR_SYSCALL */
 761         if (!(tcp->flags & TCB_INSYSCALL)) {
 762                 if (tcp->status.PR_WHY != PR_SYSENTRY) {
 763                         if (
 764                             scno == SYS_fork
 765 #ifdef SYS_vfork
 766                             || scno == SYS_vfork
 767 #endif /* SYS_vfork */
 768                             ) {
 769                                 /* We are returning in the child, fake it. */
 770                                 tcp->status.PR_WHY = PR_SYSENTRY;
 771                                 trace_syscall(tcp);
 772                                 tcp->status.PR_WHY = PR_SYSEXIT;
 773                         }
 774                         else {
 775                                 fprintf(stderr, "syscall: missing entry\n");
 776                                 tcp->flags |= TCB_INSYSCALL;
 777                         }
 778                 }
 779         }
 780         else {
 781                 if (tcp->status.PR_WHY != PR_SYSEXIT) {
 782                         fprintf(stderr, "syscall: missing exit\n");
 783                         tcp->flags &= ~TCB_INSYSCALL;
 784                 }
 785         }
 786 #endif /* SVR4 */
 787 #ifdef SUNOS4
 788         if (!(tcp->flags & TCB_INSYSCALL)) {
 789                 if (scno == 0) {
 790                         fprintf(stderr, "syscall: missing entry\n");
 791                         tcp->flags |= TCB_INSYSCALL;
 792                 }
 793         }
 794         else {
 795                 if (scno != 0) {
 796                         if (debug) {
 797                                 /*
 798                                  * This happens when a signal handler
 799                                  * for a signal which interrupted a
 800                                  * a system call makes another system call.
 801                                  */
 802                                 fprintf(stderr, "syscall: missing exit\n");
 803                         }
 804                         tcp->flags &= ~TCB_INSYSCALL;
 805                 }
 806         }
 807 #endif /* SUNOS4 */
 808 #ifdef LINUX
 809 #if defined (I386)
 810         if (upeek(pid, 4*EAX, &eax) < 0)
 811                 return -1;
 812         if (eax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 813                 if (debug)
 814                         fprintf(stderr, "stray syscall exit: eax = %ld\n", eax);
 815                 return 0;
 816         }
 817 #elif defined (POWERPC)
 818 # define SO_MASK 0x10000000
 819         if (upeek(pid, 4*PT_CCR, &flags) < 0)
 820                 return -1;
 821         if (upeek(pid, 4*PT_R3, &result) < 0)
 822                 return -1;
 823         if (flags & SO_MASK)
 824                 result = -result;
 825 #elif defined (M68K)
 826         if (upeek(pid, 4*PT_D0, &d0) < 0)
 827                 return -1;
 828         if (d0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 829                 if (debug)
 830                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", d0);
 831                 return 0;
 832         }
 833 #elif defined (ARM)
 834         if (upeek(pid, 4*0, (long *)&r0) < 0)
 835                 return -1;
 836         if ( 0 && r0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 837                 if (debug)
 838                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", r0);
 839                 return 0;
 840         }
 841 #else
 842 #endif
 843 #endif /* LINUX */
 844
 845         if (tcp->flags & TCB_INSYSCALL) {
 846                 long u_error;
 847
 848 #ifdef LINUX
 849 #ifdef I386
 850                 if (eax < 0 && -eax < nerrnos) {
 851                         tcp->u_rval = -1;
 852                         u_error = -eax;
 853                 }
 854                 else {
 855                         tcp->u_rval = eax;
 856                         u_error = 0;
 857                 }
 858 #else /* !I386 */
 859 #ifdef MIPS
 860                 if (a3) {
 861                         tcp->u_rval = -1;
 862                         u_error = r2;
 863                 } else {
 864                         tcp->u_rval = r2;
 865                         u_error = 0;
 866                 }
 867 #else
 868 #ifdef POWERPC
 869                 if (result && (unsigned) -result < nerrnos) {
 870                         tcp->u_rval = -1;
 871                         u_error = -result;
 872                 }
 873                 else {
 874                         tcp->u_rval = result;
 875                         u_error = 0;
 876                 }
 877 #else /* !POWERPC */
 878 #ifdef M68K
 879                 if (d0 && (unsigned) -d0 < nerrnos) {
 880                         tcp->u_rval = -1;
 881                         u_error = -d0;
 882                 }
 883                 else {
 884                         tcp->u_rval = d0;
 885                         u_error = 0;
 886                 }
 887 #else /* !M68K */
 888 #ifdef ARM
 889                 if (r0 && (unsigned) -r0 < nerrnos) {
 890                         tcp->u_rval = -1;
 891                         u_error = -r0;
 892                 }
 893                 else {
 894                         tcp->u_rval = r0;
 895                         u_error = 0;
 896                 }
 897 #else /* !ARM */
 898 #ifdef ALPHA
 899                 if (a3) {
 900                         tcp->u_rval = -1;
 901                         u_error = r0;
 902                 }
 903                 else {
 904                         tcp->u_rval = r0;
 905                         u_error = 0;
 906                 }
 907 #else /* !ALPHA */
 908 #ifdef SPARC
 909                 if (regs.r_psr & PSR_C) {
 910                         tcp->u_rval = -1;
 911                         u_error = regs.r_o0;
 912                 }
 913                 else {
 914                         tcp->u_rval = regs.r_o0;
 915                         u_error = 0;
 916                 }
 917 #endif /* SPARC */
 918 #endif /* ALPHA */
 919 #endif /* ARM */
 920 #endif /* M68K */
 921 #endif /* POWERPC */
 922 #endif /* MIPS */
 923 #endif /* I386 */
 924 #endif /* LINUX */
 925 #ifdef SUNOS4
 926                 /* get error code from user struct */
 927                 if (upeek(pid, uoff(u_error), &u_error) < 0)
 928                         return -1;
 929                 u_error >>= 24; /* u_error is a char */
 930
 931                 /* get system call return value */
 932                 if (upeek(pid, uoff(u_rval1), &tcp->u_rval) < 0)
 933                         return -1;
 934 #endif /* SUNOS4 */
 935 #ifdef SVR4
 936 #ifdef SPARC
 937                 /* Judicious guessing goes a long way. */
 938                 if (tcp->status.pr_reg[R_PSR] & 0x100000) {
 939                         tcp->u_rval = -1;
 940                         u_error = tcp->status.pr_reg[R_O0];
 941                 }
 942                 else {
 943                         tcp->u_rval = tcp->status.pr_reg[R_O0];
 944                         u_error = 0;
 945                 }
 946 #endif /* SPARC */
 947 #ifdef I386
 948                 /* Wanna know how to kill an hour single-stepping? */
 949                 if (tcp->status.PR_REG[EFL] & 0x1) {
 950                         tcp->u_rval = -1;
 951                         u_error = tcp->status.PR_REG[EAX];
 952                 }
 953                 else {
 954                         tcp->u_rval = tcp->status.PR_REG[EAX];
 955                         u_error = 0;
 956                 }
 957 #endif /* I386 */
 958 #ifdef MIPS
 959                 if (tcp->status.pr_reg[CTX_A3]) {
 960                         tcp->u_rval = -1;
 961                         u_error = tcp->status.pr_reg[CTX_V0];
 962                 }
 963                 else {
 964                         tcp->u_rval = tcp->status.pr_reg[CTX_V0];
 965                         u_error = 0;
 966                 }
 967 #endif /* MIPS */
 968 #endif /* SVR4 */
 969                 tcp->u_error = u_error;
 970
 971                 internal_syscall(tcp);
 972                 if (!(qual_flags[tcp->scno] & QUAL_TRACE)) {
 973                         tcp->flags &= ~TCB_INSYSCALL;
 974                         return 0;
 975                 }
 976
 977                 if (tcp->flags & TCB_REPRINT) {
 978                         printleader(tcp);
 979                         tprintf("<... ");
 980                         if (tcp->scno >= nsyscalls)
 981                                 tprintf("syscall_%lu", tcp->scno);
 982                         else
 983                                 tprintf("%s", sysent[tcp->scno].sys_name);
 984                         tprintf(" resumed> ");
 985                 }
 986
 987                 if (cflag) {
 988                         call_count[tcp->scno]++;
 989                         if (u_error)
 990                                 error_count[tcp->scno]++;
 991                         tv_sub(&tv, &tv, &tcp->etime);
 992 #ifdef LINUX
 993                         if (tv_cmp(&tv, &tcp->dtime) > 0) {
 994                                 static struct timeval one_tick =
 995                                         { 0, 1000000 / HZ };
 996
 997                                 if (tv_nz(&tcp->dtime))
 998                                         tv = tcp->dtime;
 999                                 else if (tv_cmp(&tv, &one_tick) > 0) {
1000                                         if (tv_cmp(&shortest, &one_tick) < 0)
1001                                                 tv = shortest;
1002                                         else
1003                                                 tv = one_tick;
1004                                 }
1005                         }
1006 #endif /* LINUX */
1007                         if (tv_cmp(&tv, &shortest) < 0)
1008                                 shortest = tv;
1009                         tv_add(&tv_count[tcp->scno],
1010                                 &tv_count[tcp->scno], &tv);
1011                         tcp->flags &= ~TCB_INSYSCALL;
1012                         return 0;
1013                 }
1014
1015                 if (tcp->scno >= nsyscalls
1016                     || (qual_flags[tcp->scno] & QUAL_RAW))
1017                         sys_res = printargs(tcp);
1018                 else
1019                         sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1020                 u_error = tcp->u_error;
1021                 tprintf(") ");
1022                 tabto(acolumn);
1023                 if (qual_flags[tcp->scno] & QUAL_RAW) {
1024                         if (u_error)
1025                                 tprintf("= -1 (errno %ld)", u_error);
1026                         else
1027                                 tprintf("= %#lx", tcp->u_rval);
1028                 }
1029                 else if (!(sys_res & RVAL_NONE) && u_error) {
1030 #ifdef LINUX
1031                         switch (u_error) {
1032                         case ERESTARTSYS:
1033                                 tprintf("= ? ERESTARTSYS (To be restarted)");
1034                                 break;
1035                         case ERESTARTNOINTR:
1036                                 tprintf("= ? ERESTARTNOINTR (To be restarted)");
1037                                 break;
1038                         case ERESTARTNOHAND:
1039                                 tprintf("= ? ERESTARTNOHAND (To be restarted)");
1040                                 break;
1041                         default:
1042 #endif /* LINUX */
1043                                 tprintf("= -1 ");
1044                                 if (u_error < nerrnos && u_error < sys_nerr)
1045                                         tprintf("%s (%s)", errnoent[u_error],
1046                                                 sys_errlist[u_error]);
1047                                 else if (u_error < nerrnos)
1048                                         tprintf("%s (errno %ld)",
1049                                                 errnoent[u_error], u_error);
1050                                 else if (u_error < sys_nerr)
1051                                         tprintf("ERRNO_%ld (%s)", u_error,
1052                                                 sys_errlist[u_error]);
1053                                 else
1054                                         tprintf("E??? (errno %ld)", u_error);
1055 #ifdef LINUX
1056                                 break;
1057                         }
1058 #endif /* LINUX */
1059                 }
1060                 else {
1061                         if (sys_res & RVAL_NONE)
1062                                 tprintf("= ?");
1063                         else {
1064                                 switch (sys_res & RVAL_MASK) {
1065                                 case RVAL_HEX:
1066                                         tprintf("= %#lx", tcp->u_rval);
1067                                         break;
1068                                 case RVAL_OCTAL:
1069                                         tprintf("= %#lo", tcp->u_rval);
1070                                         break;
1071                                 case RVAL_UDECIMAL:
1072                                         tprintf("= %lu", tcp->u_rval);
1073                                         break;
1074                                 case RVAL_DECIMAL:
1075                                         tprintf("= %ld", tcp->u_rval);
1076                                         break;
1077                                 default:
1078                                         fprintf(stderr,
1079                                                 "invalid rval format\n");
1080                                         break;
1081                                 }
1082                         }
1083                         if ((sys_res & RVAL_STR) && tcp->auxstr)
1084                                 tprintf(" (%s)", tcp->auxstr);
1085                 }
1086                 if (dtime) {
1087                         tv_sub(&tv, &tv, &tcp->etime);
1088                         tprintf(" <%ld.%06ld>",
1089                                 (long) tv.tv_sec, (long) tv.tv_usec);
1090                 }
1091                 printtrailer(tcp);
1092
1093                 dumpio(tcp);
1094                 if (fflush(tcp->outf) == EOF)
1095                         return -1;
1096                 tcp->flags &= ~TCB_INSYSCALL;
1097                 return 0;
1098         }
1099
1100         /* Entering system call */
1101         tcp->scno = scno;
1102 #ifdef LINUX
1103 #if defined(S390)
1104         {
1105                 int i;
1106                 tcp->u_nargs = sysent[tcp->scno].nargs;
1107                 for (i = 0; i < tcp->u_nargs; i++) {
1108                         if (upeek(pid,i==0 ? PT_ORIGGPR2:PT_GPR2+(i<<2), &tcp->u_arg[i]) < 0)
1109                                 return -1;
1110                 }
1111         }
1112 #elif defined (ALPHA)
1113         {
1114                 int i;
1115                 tcp->u_nargs = sysent[tcp->scno].nargs;
1116                 for (i = 0; i < tcp->u_nargs; i++) {
1117                         /* WTA: if scno is out-of-bounds this will bomb. Add range-check
1118                          * for scno somewhere above here!
1119                          */
1120                         if (upeek(pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1121                                 return -1;
1122                 }
1123         }
1124 #elif defined (MIPS)
1125         {
1126                 long sp;
1127                 int i, nargs;
1128
1129                 nargs = tcp->u_nargs = sysent[tcp->scno].nargs;
1130                 if(nargs > 4) {
1131                         if(upeek(pid, REG_SP, &sp) < 0)
1132                                 return -1;
1133                         for(i = 0; i < 4; i++) {
1134                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i])<0)
1135                                         return -1;
1136                         }
1137                         umoven(tcp, sp+16, (nargs-4) * sizeof(tcp->u_arg[0]),
1138                                (char *)(tcp->u_arg + 4));
1139                 } else {
1140                         for(i = 0; i < nargs; i++) {
1141                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1142                                         return -1;
1143                         }
1144                 }
1145         }
1146 #elif defined (POWERPC)
1147         {
1148                 int i;
1149                 tcp->u_nargs = sysent[tcp->scno].nargs;
1150                 for (i = 0; i < tcp->u_nargs; i++) {
1151                         if (upeek(pid, (i==0) ? (4*PT_ORIG_R3) : ((i+PT_R3)*4), &tcp->u_arg[i]) < 0)
1152                                 return -1;
1153                 }
1154         }
1155 #elif defined (SPARC)
1156         {
1157                 int i;
1158
1159                 tcp->u_nargs = sysent[tcp->scno].nargs;
1160                 for (i = 0; i < tcp->u_nargs; i++)
1161                         tcp->u_arg[i] = *((&regs.r_o0) + i);
1162         }
1163 #else
1164         {
1165                 int i;
1166                 tcp->u_nargs = sysent[tcp->scno].nargs;
1167                 for (i = 0; i < tcp->u_nargs; i++) {
1168                         if (upeek(pid, i*4, &tcp->u_arg[i]) < 0)
1169                                 return -1;
1170                 }
1171         }
1172 #endif
1173 #endif /* LINUX */
1174 #ifdef SUNOS4
1175         {
1176                 int i;
1177                 tcp->u_nargs = sysent[tcp->scno].nargs;
1178                 for (i = 0; i < tcp->u_nargs; i++) {
1179                         struct user *u;
1180
1181                         if (upeek(pid, uoff(u_arg[0]) +
1182                             (i*sizeof(u->u_arg[0])), &tcp->u_arg[i]) < 0)
1183                                 return -1;
1184                 }
1185         }
1186 #endif /* SUNOS4 */
1187 #ifdef SVR4
1188 #ifdef MIPS
1189         /*
1190          * SGI is broken: even though it has pr_sysarg, it doesn't
1191          * set them on system call entry.  Get a clue.
1192          */
1193         if (sysent[tcp->scno].nargs != -1)
1194                 tcp->u_nargs = sysent[tcp->scno].nargs;
1195         else
1196                 tcp->u_nargs = tcp->status.pr_nsysarg;
1197         if (tcp->u_nargs > 4) {
1198                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1199                         4*sizeof(tcp->u_arg[0]));
1200                 umoven(tcp, tcp->status.pr_reg[CTX_SP] + 16,
1201                         (tcp->u_nargs - 4)*sizeof(tcp->u_arg[0]), (char *) (tcp->u_arg + 4));
1202         }
1203         else {
1204                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1205                         tcp->u_nargs*sizeof(tcp->u_arg[0]));
1206         }
1207 #else /* !MIPS */
1208 #ifdef HAVE_PR_SYSCALL
1209         if (sysent[tcp->scno].nargs != -1)
1210                 tcp->u_nargs = sysent[tcp->scno].nargs;
1211         else
1212                 tcp->u_nargs = tcp->status.pr_nsysarg;
1213         {
1214                 int i;
1215                 for (i = 0; i < tcp->u_nargs; i++)
1216                         tcp->u_arg[i] = tcp->status.pr_sysarg[i];
1217         }
1218 #else /* !HAVE_PR_SYSCALL */
1219 #ifdef I386
1220         if (sysent[tcp->scno].nargs != -1)
1221                 tcp->u_nargs = sysent[tcp->scno].nargs;
1222         else
1223 #if UNIXWARE >= 2
1224                 tcp->u_nargs = tcp->status.pr_lwp.pr_nsysarg;
1225 #else
1226                 tcp->u_nargs = 5;
1227 #endif
1228         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
1229                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
1230 #endif /* I386 */
1231 #endif /* !HAVE_PR_SYSCALL */
1232 #endif /* !MIPS */
1233 #endif /* SVR4 */
1234 #ifdef __arm__
1235         switch (tcp->scno + __NR_SYSCALL_BASE) {
1236 #else
1237         switch (tcp->scno) {
1238 #endif
1239 #ifdef LINUX
1240 #if !defined (ALPHA) && !defined(SPARC) && !defined(MIPS)
1241         case SYS_socketcall:
1242                 decode_subcall(tcp, SYS_socket_subcall,
1243                         SYS_socket_nsubcalls, deref_style);
1244                 break;
1245         case SYS_ipc:
1246                 decode_subcall(tcp, SYS_ipc_subcall,
1247                         SYS_ipc_nsubcalls, shift_style);
1248                 break;
1249 #endif /* !ALPHA && !SPARC */
1250 #ifdef SPARC
1251         case SYS_socketcall:
1252                 sparc_socket_decode (tcp);
1253                 break;
1254 #endif
1255 #endif /* LINUX */
1256 #ifdef SVR4
1257 #ifdef SYS_pgrpsys_subcall
1258         case SYS_pgrpsys:
1259                 decode_subcall(tcp, SYS_pgrpsys_subcall,
1260                         SYS_pgrpsys_nsubcalls, shift_style);
1261                 break;
1262 #endif /* SYS_pgrpsys_subcall */
1263 #ifdef SYS_sigcall_subcall
1264         case SYS_sigcall:
1265                 decode_subcall(tcp, SYS_sigcall_subcall,
1266                         SYS_sigcall_nsubcalls, mask_style);
1267                 break;
1268 #endif /* SYS_sigcall_subcall */
1269         case SYS_msgsys:
1270                 decode_subcall(tcp, SYS_msgsys_subcall,
1271                         SYS_msgsys_nsubcalls, shift_style);
1272                 break;
1273         case SYS_shmsys:
1274                 decode_subcall(tcp, SYS_shmsys_subcall,
1275                         SYS_shmsys_nsubcalls, shift_style);
1276                 break;
1277         case SYS_semsys:
1278                 decode_subcall(tcp, SYS_semsys_subcall,
1279                         SYS_semsys_nsubcalls, shift_style);
1280                 break;
1281 #if 0 /* broken */
1282         case SYS_utssys:
1283                 decode_subcall(tcp, SYS_utssys_subcall,
1284                         SYS_utssys_nsubcalls, shift_style);
1285                 break;
1286 #endif
1287         case SYS_sysfs:
1288                 decode_subcall(tcp, SYS_sysfs_subcall,
1289                         SYS_sysfs_nsubcalls, shift_style);
1290                 break;
1291         case SYS_spcall:
1292                 decode_subcall(tcp, SYS_spcall_subcall,
1293                         SYS_spcall_nsubcalls, shift_style);
1294                 break;
1295 #ifdef SYS_context_subcall
1296         case SYS_context:
1297                 decode_subcall(tcp, SYS_context_subcall,
1298                         SYS_context_nsubcalls, shift_style);
1299                 break;
1300 #endif /* SYS_context_subcall */
1301 #ifdef SYS_door_subcall
1302         case SYS_door:
1303                 decode_subcall(tcp, SYS_door_subcall,
1304                         SYS_door_nsubcalls, door_style);
1305                 break;
1306 #endif /* SYS_door_subcall */
1307 #endif /* SVR4 */
1308 #ifdef SUNOS4
1309         case SYS_semsys:
1310                 decode_subcall(tcp, SYS_semsys_subcall,
1311                         SYS_semsys_nsubcalls, shift_style);
1312                 break;
1313         case SYS_msgsys:
1314                 decode_subcall(tcp, SYS_msgsys_subcall,
1315                         SYS_msgsys_nsubcalls, shift_style);
1316                 break;
1317         case SYS_shmsys:
1318                 decode_subcall(tcp, SYS_shmsys_subcall,
1319                         SYS_shmsys_nsubcalls, shift_style);
1320                 break;
1321 #endif
1322         }
1323
1324         internal_syscall(tcp);
1325         if (!(qual_flags[tcp->scno] & QUAL_TRACE)) {
1326                 tcp->flags |= TCB_INSYSCALL;
1327                 return 0;
1328         }
1329
1330         if (cflag) {
1331                 gettimeofday(&tcp->etime, NULL);
1332                 tcp->flags |= TCB_INSYSCALL;
1333                 return 0;
1334         }
1335
1336         printleader(tcp);
1337         tcp->flags &= ~TCB_REPRINT;
1338         tcp_last = tcp;
1339         if (tcp->scno >= nsyscalls)
1340                 tprintf("syscall_%lu(", tcp->scno);
1341         else
1342                 tprintf("%s(", sysent[tcp->scno].sys_name);
1343         if (tcp->scno >= nsyscalls ||
1344             ((qual_flags[tcp->scno] & QUAL_RAW) && tcp->scno != SYS_exit))
1345                 sys_res = printargs(tcp);
1346         else
1347                 sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1348         if (fflush(tcp->outf) == EOF)
1349                 return -1;
1350         tcp->flags |= TCB_INSYSCALL;
1351         /* Measure the entrance time as late as possible to avoid errors. */
1352         if (dtime)
1353                 gettimeofday(&tcp->etime, NULL);
1354         return sys_res;
1355 }
1356
1357 int
1358 printargs(tcp)
1359 struct tcb *tcp;
1360 {
1361         if (entering(tcp)) {
1362                 int i;
1363
1364                 for (i = 0; i < tcp->u_nargs; i++)
1365                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
1366         }
1367         return 0;
1368 }
1369
1370 long
1371 getrval2(tcp)
1372 struct tcb *tcp;
1373 {
1374         long val = -1;
1375
1376 #ifdef LINUX
1377 #ifdef SPARC
1378         struct regs regs;
1379         if (ptrace(PTRACE_GETREGS,tcp->pid,(char *)&regs,0) < 0)
1380                 return -1;
1381         val = regs.r_o1;
1382 #endif /* SPARC */
1383 #endif /* LINUX */
1384
1385 #ifdef SUNOS4
1386         if (upeek(tcp->pid, uoff(u_rval2), &val) < 0)
1387                 return -1;
1388 #endif /* SUNOS4 */
1389
1390 #ifdef SVR4
1391 #ifdef SPARC
1392         val = tcp->status.PR_REG[R_O1];
1393 #endif /* SPARC */
1394 #ifdef I386
1395         val = tcp->status.PR_REG[EDX];
1396 #endif /* I386 */
1397 #ifdef MIPS
1398         val = tcp->status.PR_REG[CTX_V1];
1399 #endif /* MIPS */
1400 #endif /* SVR4 */
1401
1402         return val;
1403 }
1404
1405 /*
1406  * Apparently, indirect system calls have already be converted by ptrace(2),
1407  * so if you see "indir" this program has gone astray.
1408  */
1409 int
1410 sys_indir(tcp)
1411 struct tcb *tcp;
1412 {
1413         int i, scno, nargs;
1414
1415         if (entering(tcp)) {
1416                 if ((scno = tcp->u_arg[0]) > nsyscalls) {
1417                         fprintf(stderr, "Bogus syscall: %u\n", scno);
1418                         return 0;
1419                 }
1420                 nargs = sysent[scno].nargs;
1421                 tprintf("%s", sysent[scno].sys_name);
1422                 for (i = 0; i < nargs; i++)
1423                         tprintf(", %#lx", tcp->u_arg[i+1]);
1424         }
1425         return 0;
1426 }
1427
1428 static int
1429 time_cmp(a, b)
1430 void *a;
1431 void *b;
1432 {
1433         return -tv_cmp(&tv_count[*((int *) a)], &tv_count[*((int *) b)]);
1434 }
1435
1436 static int
1437 syscall_cmp(a, b)
1438 void *a;
1439 void *b;
1440 {
1441         return strcmp(sysent[*((int *) a)].sys_name,
1442                 sysent[*((int *) b)].sys_name);
1443 }
1444
1445 static int
1446 count_cmp(a, b)
1447 void *a;
1448 void *b;
1449 {
1450         int m = call_count[*((int *) a)], n = call_count[*((int *) b)];
1451
1452         return (m < n) ? 1 : (m > n) ? -1 : 0;
1453 }
1454
1455 static int (*sortfun)();
1456 static struct timeval overhead = { -1, -1 };
1457
1458 void
1459 set_sortby(sortby)
1460 char *sortby;
1461 {
1462         if (strcmp(sortby, "time") == 0)
1463                 sortfun = time_cmp;
1464         else if (strcmp(sortby, "calls") == 0)
1465                 sortfun = count_cmp;
1466         else if (strcmp(sortby, "name") == 0)
1467                 sortfun = syscall_cmp;
1468         else if (strcmp(sortby, "nothing") == 0)
1469                 sortfun = NULL;
1470         else {
1471                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
1472                 exit(1);
1473         }
1474 }
1475
1476 void set_overhead(n)
1477 int n;
1478 {
1479         overhead.tv_sec = n / 1000000;
1480         overhead.tv_usec = n % 1000000;
1481 }
1482
1483 void
1484 call_summary(outf)
1485 FILE *outf;
1486 {
1487         int i, j;
1488         int call_cum, error_cum;
1489         struct timeval tv_cum, dtv;
1490         double percent;
1491         char *dashes = "-------------------------";
1492         char error_str[16];
1493
1494         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
1495         if (overhead.tv_sec == -1) {
1496                 tv_mul(&overhead, &shortest, 8);
1497                 tv_div(&overhead, &overhead, 10);
1498         }
1499         for (i = 0; i < nsyscalls; i++) {
1500                 sorted_count[i] = i;
1501                 if (call_count[i] == 0)
1502                         continue;
1503                 tv_mul(&dtv, &overhead, call_count[i]);
1504                 tv_sub(&tv_count[i], &tv_count[i], &dtv);
1505                 call_cum += call_count[i];
1506                 error_cum += error_count[i];
1507                 tv_add(&tv_cum, &tv_cum, &tv_count[i]);
1508         }
1509         if (sortfun)
1510                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
1511         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
1512                 "% time", "seconds", "usecs/call",
1513                 "calls", "errors", "syscall");
1514         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
1515                 dashes, dashes, dashes, dashes, dashes, dashes);
1516         for (i = 0; i < nsyscalls; i++) {
1517                 j = sorted_count[i];
1518                 if (call_count[j] == 0)
1519                         continue;
1520                 tv_div(&dtv, &tv_count[j], call_count[j]);
1521                 if (error_count[j])
1522                         sprintf(error_str, "%d", error_count[j]);
1523                 else
1524                         error_str[0] = '\0';
1525                 percent = 100.0*tv_float(&tv_count[j])/tv_float(&tv_cum);
1526                 fprintf(outf, "%6.2f %4ld.%06ld %11ld %9d %9.9s %s\n",
1527                         percent, (long) tv_count[j].tv_sec,
1528                         (long) tv_count[j].tv_usec,
1529                         (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
1530                         call_count[j], error_str, sysent[j].sys_name);
1531         }
1532         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
1533                 dashes, dashes, dashes, dashes, dashes, dashes);
1534         if (error_cum)
1535                 sprintf(error_str, "%d", error_cum);
1536         else
1537                 error_str[0] = '\0';
1538         fprintf(outf, "%6.6s %4ld.%06ld %11.11s %9d %9.9s %s\n",
1539                 "100.00", (long) tv_cum.tv_sec, (long) tv_cum.tv_usec, "",
1540                 call_cum, error_str, "total");
1541 }