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