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 #ifdef SPARC
  47 #  define fpq kernel_fpq
  48 #  define fq kernel_fq
  49 #  define fpu kernel_fpu
  50 #endif
  51 #include <asm/reg.h>
  52 #ifdef SPARC
  53 #  undef fpq
  54 #  undef fq
  55 #  undef fpu
  56 #endif
  57 #endif
  58
  59 #ifdef HAVE_SYS_REG_H
  60 #include <sys/reg.h>
  61 #ifndef PTRACE_PEEKUSR
  62 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  63 #endif
  64 #elif defined(HAVE_LINUX_PTRACE_H)
  65 #undef PTRACE_SYSCALL
  66 #include <linux/ptrace.h>
  67 #endif
  68
  69 #if defined(LINUX) && defined(IA64)
  70 # include <asm/ptrace_offsets.h>
  71 # include <asm/rse.h>
  72 #endif
  73
  74 #ifndef SYS_ERRLIST_DECLARED
  75 extern int sys_nerr;
  76 extern char *sys_errlist[];
  77 #endif /* SYS_ERRLIST_DECLARED */
  78
  79 #define NR_SYSCALL_BASE 0
  80 #ifdef LINUX
  81 #ifndef ERESTARTSYS
  82 #define ERESTARTSYS     512
  83 #endif
  84 #ifndef ERESTARTNOINTR
  85 #define ERESTARTNOINTR  513
  86 #endif
  87 #ifndef ERESTARTNOHAND
  88 #define ERESTARTNOHAND  514     /* restart if no handler.. */
  89 #endif
  90 #ifndef ENOIOCTLCMD
  91 #define ENOIOCTLCMD     515     /* No ioctl command */
  92 #endif
  93 #ifndef NSIG
  94 #define NSIG 32
  95 #endif
  96 #ifdef ARM
  97 #undef NSIG
  98 #define NSIG 32
  99 #undef NR_SYSCALL_BASE
 100 #define NR_SYSCALL_BASE __NR_SYSCALL_BASE
 101 #endif
 102 #endif /* LINUX */
 103
 104 #include "syscall.h"
 105
 106 /* Define these shorthand notations to simplify the syscallent files. */
 107 #define TF TRACE_FILE
 108 #define TI TRACE_IPC
 109 #define TN TRACE_NETWORK
 110 #define TP TRACE_PROCESS
 111 #define TS TRACE_SIGNAL
 112
 113 struct sysent sysent0[] = {
 114 #include "syscallent.h"
 115 };
 116 int nsyscalls0 = sizeof sysent0 / sizeof sysent0[0];
 117
 118 #if SUPPORTED_PERSONALITIES >= 2
 119 struct sysent sysent1[] = {
 120 #include "syscallent1.h"
 121 };
 122 int nsyscalls1 = sizeof sysent1 / sizeof sysent1[0];
 123 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 124
 125 #if SUPPORTED_PERSONALITIES >= 3
 126 struct sysent sysent2[] = {
 127 #include "syscallent2.h"
 128 };
 129 int nsyscalls2 = sizeof sysent2 / sizeof sysent2[0];
 130 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 131
 132 struct sysent *sysent;
 133 int nsyscalls;
 134
 135 /* Now undef them since short defines cause wicked namespace pollution. */
 136 #undef TF
 137 #undef TI
 138 #undef TN
 139 #undef TP
 140 #undef TS
 141
 142 char *errnoent0[] = {
 143 #include "errnoent.h"
 144 };
 145 int nerrnos0 = sizeof errnoent0 / sizeof errnoent0[0];
 146
 147 #if SUPPORTED_PERSONALITIES >= 2
 148 char *errnoent1[] = {
 149 #include "errnoent1.h"
 150 };
 151 int nerrnos1 = sizeof errnoent1 / sizeof errnoent1[0];
 152 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 153
 154 #if SUPPORTED_PERSONALITIES >= 3
 155 char *errnoent2[] = {
 156 #include "errnoent2.h"
 157 };
 158 int nerrnos2 = sizeof errnoent2 / sizeof errnoent2[0];
 159 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 160
 161 char **errnoent;
 162 int nerrnos;
 163
 164 int current_personality;
 165
 166 int
 167 set_personality(personality)
 168 int personality;
 169 {
 170         switch (personality) {
 171         case 0:
 172                 errnoent = errnoent0;
 173                 nerrnos = nerrnos0;
 174                 sysent = sysent0;
 175                 nsyscalls = nsyscalls0;
 176                 ioctlent = ioctlent0;
 177                 nioctlents = nioctlents0;
 178                 signalent = signalent0;
 179                 nsignals = nsignals0;
 180                 break;
 181
 182 #if SUPPORTED_PERSONALITIES >= 2
 183         case 1:
 184                 errnoent = errnoent1;
 185                 nerrnos = nerrnos1;
 186                 sysent = sysent1;
 187                 nsyscalls = nsyscalls1;
 188                 ioctlent = ioctlent1;
 189                 nioctlents = nioctlents1;
 190                 signalent = signalent1;
 191                 nsignals = nsignals1;
 192                 break;
 193 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 194
 195 #if SUPPORTED_PERSONALITIES >= 3
 196         case 2:
 197                 errnoent = errnoent2;
 198                 nerrnos = nerrnos2;
 199                 sysent = sysent2;
 200                 nsyscalls = nsyscalls2;
 201                 ioctlent = ioctlent2;
 202                 nioctlents = nioctlents2;
 203                 signalent = signalent2;
 204                 nsignals = nsignals2;
 205                 break;
 206 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 207
 208         default:
 209                 return -1;
 210         }
 211
 212         current_personality = personality;
 213         return 0;
 214 }
 215
 216 int qual_flags[MAX_QUALS];
 217
 218 static int call_count[MAX_QUALS];
 219 static int error_count[MAX_QUALS];
 220 static struct timeval tv_count[MAX_QUALS];
 221 static int sorted_count[MAX_QUALS];
 222
 223 static struct timeval shortest = { 1000000, 0 };
 224
 225 static int lookup_syscall(), lookup_signal(), lookup_fault(), lookup_desc();
 226
 227 static struct qual_options {
 228         int bitflag;
 229         char *option_name;
 230         int (*lookup)();
 231         char *argument_name;
 232 } qual_options[] = {
 233         { QUAL_TRACE,   "trace",        lookup_syscall, "system call"   },
 234         { QUAL_TRACE,   "t",            lookup_syscall, "system call"   },
 235         { QUAL_ABBREV,  "abbrev",       lookup_syscall, "system call"   },
 236         { QUAL_ABBREV,  "a",            lookup_syscall, "system call"   },
 237         { QUAL_VERBOSE, "verbose",      lookup_syscall, "system call"   },
 238         { QUAL_VERBOSE, "v",            lookup_syscall, "system call"   },
 239         { QUAL_RAW,     "raw",          lookup_syscall, "system call"   },
 240         { QUAL_RAW,     "x",            lookup_syscall, "system call"   },
 241         { QUAL_SIGNAL,  "signal",       lookup_signal,  "signal"        },
 242         { QUAL_SIGNAL,  "signals",      lookup_signal,  "signal"        },
 243         { QUAL_SIGNAL,  "s",            lookup_signal,  "signal"        },
 244         { QUAL_FAULT,   "fault",        lookup_fault,   "fault"         },
 245         { QUAL_FAULT,   "faults",       lookup_fault,   "fault"         },
 246         { QUAL_FAULT,   "m",            lookup_fault,   "fault"         },
 247         { QUAL_READ,    "read",         lookup_desc,    "descriptor"    },
 248         { QUAL_READ,    "reads",        lookup_desc,    "descriptor"    },
 249         { QUAL_READ,    "r",            lookup_desc,    "descriptor"    },
 250         { QUAL_WRITE,   "write",        lookup_desc,    "descriptor"    },
 251         { QUAL_WRITE,   "writes",       lookup_desc,    "descriptor"    },
 252         { QUAL_WRITE,   "w",            lookup_desc,    "descriptor"    },
 253         { 0,            NULL,           NULL,           NULL            },
 254 };
 255
 256 static int
 257 lookup_syscall(s)
 258 char *s;
 259 {
 260         int i;
 261
 262         for (i = 0; i < nsyscalls; i++) {
 263                 if (strcmp(s, sysent[i].sys_name) == 0)
 264                         return i;
 265         }
 266         return -1;
 267 }
 268
 269 static int
 270 lookup_signal(s)
 271 char *s;
 272 {
 273         int i;
 274         char buf[32];
 275
 276         if (s && *s && isdigit((unsigned char)*s))
 277                 return atoi(s);
 278         strcpy(buf, s);
 279         s = buf;
 280         for (i = 0; s[i]; i++)
 281                 s[i] = toupper((unsigned char)(s[i]));
 282         if (strncmp(s, "SIG", 3) == 0)
 283                 s += 3;
 284         for (i = 0; i <= NSIG; i++) {
 285                 if (strcmp(s, signame(i) + 3) == 0)
 286                         return i;
 287         }
 288         return -1;
 289 }
 290
 291 static int
 292 lookup_fault(s)
 293 char *s;
 294 {
 295         return -1;
 296 }
 297
 298 static int
 299 lookup_desc(s)
 300 char *s;
 301 {
 302         if (s && *s && isdigit((unsigned char)*s))
 303                 return atoi(s);
 304         return -1;
 305 }
 306
 307 static int
 308 lookup_class(s)
 309 char *s;
 310 {
 311         if (strcmp(s, "file") == 0)
 312                 return TRACE_FILE;
 313         if (strcmp(s, "ipc") == 0)
 314                 return TRACE_IPC;
 315         if (strcmp(s, "network") == 0)
 316                 return TRACE_NETWORK;
 317         if (strcmp(s, "process") == 0)
 318                 return TRACE_PROCESS;
 319         if (strcmp(s, "signal") == 0)
 320                 return TRACE_SIGNAL;
 321         return -1;
 322 }
 323
 324 void
 325 qualify(s)
 326 char *s;
 327 {
 328         struct qual_options *opt;
 329         int not;
 330         char *p;
 331         int i, n;
 332
 333         opt = &qual_options[0];
 334         for (i = 0; (p = qual_options[i].option_name); i++) {
 335                 n = strlen(p);
 336                 if (strncmp(s, p, n) == 0 && s[n] == '=') {
 337                         opt = &qual_options[i];
 338                         s += n + 1;
 339                         break;
 340                 }
 341         }
 342         not = 0;
 343         if (*s == '!') {
 344                 not = 1;
 345                 s++;
 346         }
 347         if (strcmp(s, "none") == 0) {
 348                 not = 1 - not;
 349                 s = "all";
 350         }
 351         if (strcmp(s, "all") == 0) {
 352                 for (i = 0; i < MAX_QUALS; i++) {
 353                         if (not)
 354                                 qual_flags[i] &= ~opt->bitflag;
 355                         else
 356                                 qual_flags[i] |= opt->bitflag;
 357                 }
 358                 return;
 359         }
 360         for (i = 0; i < MAX_QUALS; i++) {
 361                 if (not)
 362                         qual_flags[i] |= opt->bitflag;
 363                 else
 364                         qual_flags[i] &= ~opt->bitflag;
 365         }
 366         for (p = strtok(s, ","); p; p = strtok(NULL, ",")) {
 367                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 368                         for (i = 0; i < MAX_QUALS; i++) {
 369                                 if (sysent[i].sys_flags & n) {
 370                                         if (not)
 371                                                 qual_flags[i] &= ~opt->bitflag;
 372                                         else
 373                                                 qual_flags[i] |= opt->bitflag;
 374                                 }
 375                         }
 376                         continue;
 377                 }
 378                 if ((n = (*opt->lookup)(p)) < 0) {
 379                         fprintf(stderr, "strace: invalid %s `%s'\n",
 380                                 opt->argument_name, p);
 381                         exit(1);
 382                 }
 383                 if (not)
 384                         qual_flags[n] &= ~opt->bitflag;
 385                 else
 386                         qual_flags[n] |= opt->bitflag;
 387         }
 388         return;
 389 }
 390
 391 static void
 392 dumpio(tcp)
 393 struct tcb *tcp;
 394 {
 395         if (syserror(tcp))
 396                 return;
 397         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= MAX_QUALS)
 398                 return;
 399         switch (tcp->scno + NR_SYSCALL_BASE) {
 400         case SYS_read:
 401 #ifdef SYS_recv
 402         case SYS_recv:
 403 #endif
 404 #ifdef SYS_recvfrom
 405         case SYS_recvfrom:
 406 #endif
 407                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 408                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 409                 break;
 410         case SYS_write:
 411 #ifdef SYS_send
 412         case SYS_send:
 413 #endif
 414 #ifdef SYS_sendto
 415         case SYS_sendto:
 416 #endif
 417                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 418                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 419                 break;
 420 #ifdef SYS_readv
 421         case SYS_readv:
 422                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 423                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 424                 break;
 425 #endif
 426 #ifdef SYS_writev
 427         case SYS_writev:
 428
 429                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 430                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 431                 break;
 432 #endif
 433         }
 434 }
 435
 436 #ifndef FREEBSD
 437 enum subcall_style { shift_style, deref_style, mask_style, door_style };
 438 #else /* FREEBSD */
 439 enum subcall_style { shift_style, deref_style, mask_style, door_style, table_style };
 440
 441 struct subcall {
 442   int call;
 443   int nsubcalls;
 444   int subcalls[5];
 445 };
 446
 447 const struct subcall subcalls_table[] = {
 448   { SYS_shmsys, 5, { SYS_shmat, SYS_shmctl, SYS_shmdt, SYS_shmget, SYS_shmctl } },
 449 #ifdef SYS_semconfig
 450   { SYS_semsys, 4, { SYS___semctl, SYS_semget, SYS_semop, SYS_semconfig } },
 451 #else
 452   { SYS_semsys, 3, { SYS___semctl, SYS_semget, SYS_semop } },
 453 #endif
 454   { SYS_msgsys, 4, { SYS_msgctl, SYS_msgget, SYS_msgsnd, SYS_msgrcv } },
 455 };
 456 #endif /* FREEBSD */
 457
 458 #if !(defined(LINUX) && ( defined(ALPHA) || defined(MIPS) ))
 459
 460 const int socket_map [] = {
 461                /* SYS_SOCKET      */ 97,
 462                /* SYS_BIND        */ 104,
 463                /* SYS_CONNECT     */ 98,
 464                /* SYS_LISTEN      */ 106,
 465                /* SYS_ACCEPT      */ 99,
 466                /* SYS_GETSOCKNAME */ 150,
 467                /* SYS_GETPEERNAME */ 141,
 468                /* SYS_SOCKETPAIR  */ 135,
 469                /* SYS_SEND        */ 101,
 470                /* SYS_RECV        */ 102,
 471                /* SYS_SENDTO      */ 133,
 472                /* SYS_RECVFROM    */ 125,
 473                /* SYS_SHUTDOWN    */ 134,
 474                /* SYS_SETSOCKOPT  */ 105,
 475                /* SYS_GETSOCKOPT  */ 118,
 476                /* SYS_SENDMSG     */ 114,
 477                /* SYS_RECVMSG     */ 113
 478 };
 479
 480 void
 481 sparc_socket_decode (tcp)
 482 struct tcb *tcp;
 483 {
 484         volatile long addr;
 485         volatile int i, n;
 486
 487         if (tcp->u_arg [0] < 1 || tcp->u_arg [0] > sizeof(socket_map)/sizeof(int)+1){
 488                 return;
 489         }
 490         tcp->scno = socket_map [tcp->u_arg [0]-1];
 491         n = tcp->u_nargs = sysent [tcp->scno].nargs;
 492         addr = tcp->u_arg [1];
 493         for (i = 0; i < n; i++){
 494                 int arg;
 495                 if (umoven (tcp, addr, sizeof (arg), (void *) &arg) < 0)
 496                         arg = 0;
 497                 tcp->u_arg [i] = arg;
 498                 addr += sizeof (arg);
 499         }
 500 }
 501
 502 void
 503 decode_subcall(tcp, subcall, nsubcalls, style)
 504 struct tcb *tcp;
 505 int subcall;
 506 int nsubcalls;
 507 enum subcall_style style;
 508 {
 509         int i, addr, mask, arg;
 510
 511         switch (style) {
 512         case shift_style:
 513                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 514                         return;
 515                 tcp->scno = subcall + tcp->u_arg[0];
 516                 if (sysent[tcp->scno].nargs != -1)
 517                         tcp->u_nargs = sysent[tcp->scno].nargs;
 518                 else
 519                         tcp->u_nargs--;
 520                 for (i = 0; i < tcp->u_nargs; i++)
 521                         tcp->u_arg[i] = tcp->u_arg[i + 1];
 522                 break;
 523         case deref_style:
 524                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 525                         return;
 526                 tcp->scno = subcall + tcp->u_arg[0];
 527                 addr = tcp->u_arg[1];
 528                 for (i = 0; i < sysent[tcp->scno].nargs; i++) {
 529                         if (umove(tcp, addr, &arg) < 0)
 530                                 arg = 0;
 531                         tcp->u_arg[i] = arg;
 532                         addr += sizeof(arg);
 533                 }
 534                 tcp->u_nargs = sysent[tcp->scno].nargs;
 535                 break;
 536         case mask_style:
 537                 mask = (tcp->u_arg[0] >> 8) & 0xff;
 538                 for (i = 0; mask; i++)
 539                         mask >>= 1;
 540                 if (i >= nsubcalls)
 541                         return;
 542                 tcp->u_arg[0] &= 0xff;
 543                 tcp->scno = subcall + i;
 544                 if (sysent[tcp->scno].nargs != -1)
 545                         tcp->u_nargs = sysent[tcp->scno].nargs;
 546                 break;
 547         case door_style:
 548                 /*
 549                  * Oh, yuck.  The call code is the *sixth* argument.
 550                  * (don't you mean the *last* argument? - JH)
 551                  */
 552                 if (tcp->u_arg[5] < 0 || tcp->u_arg[5] >= nsubcalls)
 553                         return;
 554                 tcp->scno = subcall + tcp->u_arg[5];
 555                 if (sysent[tcp->scno].nargs != -1)
 556                         tcp->u_nargs = sysent[tcp->scno].nargs;
 557                 else
 558                         tcp->u_nargs--;
 559                 break;
 560 #ifdef FREEBSD
 561         case table_style:
 562                 for (i = 0; i < sizeof(subcalls_table) / sizeof(struct subcall); i++)
 563                         if (subcalls_table[i].call == tcp->scno) break;
 564                 if (i < sizeof(subcalls_table) / sizeof(struct subcall) &&
 565                     tcp->u_arg[0] >= 0 && tcp->u_arg[0] < subcalls_table[i].nsubcalls) {
 566                         tcp->scno = subcalls_table[i].subcalls[tcp->u_arg[0]];
 567                         for (i = 0; i < tcp->u_nargs; i++)
 568                                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 569                 }
 570                 break;
 571 #endif /* FREEBSD */
 572         }
 573 }
 574 #endif
 575
 576 struct tcb *tcp_last = NULL;
 577
 578 static int
 579 internal_syscall(tcp)
 580 struct tcb *tcp;
 581 {
 582         /*
 583          * We must always trace a few critical system calls in order to
 584          * correctly support following forks in the presence of tracing
 585          * qualifiers.
 586          */
 587         switch (tcp->scno + NR_SYSCALL_BASE) {
 588 #ifdef SYS_fork
 589         case SYS_fork:
 590 #endif
 591 #ifdef SYS_vfork
 592         case SYS_vfork:
 593 #endif
 594 #ifdef SYS_fork1
 595         case SYS_fork1:
 596 #endif
 597 #ifdef SYS_forkall
 598         case SYS_forkall:
 599 #endif
 600 #ifdef SYS_rfork1
 601         case SYS_rfork1:
 602 #endif
 603 #ifdef SYS_rforkall
 604         case SYS_rforkall:
 605 #endif
 606                 internal_fork(tcp);
 607                 break;
 608 #ifdef SYS_clone
 609         case SYS_clone:
 610                 internal_clone(tcp);
 611                 break;
 612 #endif
 613 #ifdef SYS_clone2
 614         case SYS_clone2:
 615                 internal_clone(tcp);
 616                 break;
 617 #endif
 618 #ifdef SYS_execv
 619         case SYS_execv:
 620 #endif
 621 #ifdef SYS_execve
 622         case SYS_execve:
 623 #endif
 624 #ifdef SYS_rexecve
 625         case SYS_rexecve:
 626 #endif
 627                 internal_exec(tcp);
 628                 break;
 629
 630 #ifdef SYS_wait
 631         case SYS_wait:
 632 #endif
 633 #ifdef SYS_wait4
 634         case SYS_wait4:
 635 #endif
 636 #ifdef SYS32_wait4
 637         case SYS32_wait4:
 638 #endif
 639 #ifdef SYS_waitpid
 640         case SYS_waitpid:
 641 #endif
 642 #ifdef SYS_waitsys
 643         case SYS_waitsys:
 644 #endif
 645                 internal_wait(tcp);
 646                 break;
 647
 648 #ifdef SYS_exit
 649         case SYS_exit:
 650 #endif
 651 #ifdef SYS32_exit
 652         case SYS32_exit:
 653 #endif
 654                 internal_exit(tcp);
 655                 break;
 656         }
 657         return 0;
 658 }
 659
 660
 661 #ifdef LINUX
 662 #if defined (I386)
 663         static long eax;
 664 #elif defined (IA64)
 665         long r8, r10, psr;
 666         long ia32 = 0;
 667 #elif defined (POWERPC)
 668         static long result,flags;
 669 #elif defined (M68K)
 670         static int d0;
 671 #elif defined (ARM)
 672         static int r0;
 673 #elif defined (ALPHA)
 674         static long r0;
 675         static long a3;
 676 #elif defined (SPARC)
 677         static struct regs regs;
 678         static unsigned long trap;
 679 #elif defined(MIPS)
 680         static long a3;
 681         static long r2;
 682 #elif defined(S390)
 683         static long gpr2;
 684         static long pc;
 685 #elif defined(HPPA)
 686         static long r28;
 687 #elif defined(SH)
 688        static long r0;
 689 #elif defined(X86_64)
 690        static long rax;
 691 #endif
 692 #endif /* LINUX */
 693 #ifdef FREEBSD
 694         struct reg regs;
 695 #endif /* FREEBSD */
 696
 697 int
 698 get_scno(tcp)
 699 struct tcb *tcp;
 700 {
 701         long scno = 0;
 702         static int currpers=-1;
 703 #ifndef USE_PROCFS
 704         int pid = tcp->pid;
 705 #endif /* !PROCFS */
 706
 707 #ifdef LINUX
 708 #if defined(S390)
 709         if (upeek(tcp->pid,PT_PSWADDR,&pc) < 0)
 710                 return -1;
 711         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(pc-4),0);
 712         if (errno)
 713                 return -1;
 714         scno&=0xFF;
 715 #elif defined (POWERPC)
 716         if (upeek(pid, 4*PT_R0, &scno) < 0)
 717                 return -1;
 718         if (!(tcp->flags & TCB_INSYSCALL)) {
 719                 /* Check if we return from execve. */
 720                 if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 721                         tcp->flags &= ~TCB_WAITEXECVE;
 722                         return 0;
 723                 }
 724         }
 725 #elif defined (I386)
 726         if (upeek(pid, 4*ORIG_EAX, &scno) < 0)
 727                 return -1;
 728 #elif defined (X86_64)
 729         if (upeek(pid, 8*ORIG_RAX, &scno) < 0)
 730                 return -1;
 731
 732         if (!(tcp->flags & TCB_INSYSCALL)) {
 733                 long val;
 734
 735                 /* Check CS register value. On x86-64 linux it is:
 736                  *      0x33    for long mode (64 bit)
 737                  *      0x23    for compatibility mode (32 bit)
 738                  * It takes only one ptrace and thus doesn't need
 739                  * to be cached.
 740                  */
 741                 if (upeek(pid, 8*CS, &val) < 0)
 742                         return -1;
 743                 switch(val)
 744                 {
 745                         case 0x23: currpers = 1; break;
 746                         case 0x33: currpers = 0; break;
 747                         default:
 748                                 fprintf(stderr, "Unknown value CS=0x%02X while "
 749                                          "detecting personality of process "
 750                                          "PID=%d\n", (int)val, pid);
 751                                 currpers = current_personality;
 752                                 break;
 753                 }
 754 #if 0
 755                 /* This version analyzes the opcode of a syscall instruction.
 756                  * (int 0x80 on i386 vs. syscall on x86-64)
 757                  * It works, but is too complicated.
 758                  */
 759                 unsigned long val, rip, i;
 760
 761                 if(upeek(pid, 8*RIP, &rip)<0)
 762                         perror("upeek(RIP)");
 763
 764                 /* sizeof(syscall) == sizeof(int 0x80) == 2 */
 765                 rip-=2;
 766                 errno = 0;
 767
 768                 call = ptrace(PTRACE_PEEKTEXT,pid,(char *)rip,0);
 769                 if (errno)
 770                         printf("ptrace_peektext failed: %s\n",
 771                                         strerror(errno));
 772                 switch (call & 0xffff)
 773                 {
 774                         /* x86-64: syscall = 0x0f 0x05 */
 775                         case 0x050f: currpers = 0; break;
 776                         /* i386: int 0x80 = 0xcd 0x80 */
 777                         case 0x80cd: currpers = 1; break;
 778                         default:
 779                                 currpers = current_personality;
 780                                 fprintf(stderr,
 781                                         "Unknown syscall opcode (0x%04X) while "
 782                                         "detecting personality of process "
 783                                         "PID=%d\n", (int)call, pid);
 784                                 break;
 785                 }
 786 #endif
 787                 if(currpers != current_personality)
 788                 {
 789                         char *names[]={"64 bit", "32 bit"};
 790                         set_personality(currpers);
 791                         printf("[ Process PID=%d runs in %s mode. ]\n",
 792                                         pid, names[current_personality]);
 793                 }
 794         }
 795 #elif defined(IA64)
 796 #       define IA64_PSR_IS      ((long)1 << 34)
 797         if (upeek (pid, PT_CR_IPSR, &psr) >= 0)
 798                 ia32 = (psr & IA64_PSR_IS) != 0;
 799         if (!(tcp->flags & TCB_INSYSCALL)) {
 800                 if (ia32) {
 801                         if (upeek(pid, PT_R1, &scno) < 0)       /* orig eax */
 802                                 return -1;
 803                         /* Check if we return from execve. */
 804                 } else {
 805                         if (upeek (pid, PT_R15, &scno) < 0)
 806                                 return -1;
 807                 }
 808         } else {
 809                 /* syscall in progress */
 810                 if (upeek (pid, PT_R8, &r8) < 0)
 811                         return -1;
 812                 if (upeek (pid, PT_R10, &r10) < 0)
 813                         return -1;
 814         }
 815         if (tcp->flags & TCB_WAITEXECVE) {
 816                 tcp->flags &= ~TCB_WAITEXECVE;
 817                 return 0;
 818         }
 819
 820 #elif defined (ARM)
 821         {
 822             long pc;
 823             upeek(pid, 4*15, &pc);
 824             umoven(tcp, pc-4, 4, (char *)&scno);
 825             scno &= 0x000fffff;
 826         }
 827 #elif defined (M68K)
 828         if (upeek(pid, 4*PT_ORIG_D0, &scno) < 0)
 829                 return -1;
 830 #elif defined (MIPS)
 831         if (upeek(pid, REG_A3, &a3) < 0)
 832                 return -1;
 833
 834         if(!(tcp->flags & TCB_INSYSCALL)) {
 835                 if (upeek(pid, REG_V0, &scno) < 0)
 836                         return -1;
 837
 838                 if (scno < 0 || scno > nsyscalls) {
 839                         if(a3 == 0 || a3 == -1) {
 840                                 if(debug)
 841                                         fprintf (stderr, "stray syscall exit: v0 = %ld\n", scno);
 842                                 return 0;
 843                         }
 844                 }
 845         } else {
 846                 if (upeek(pid, REG_V0, &r2) < 0)
 847                         return -1;
 848         }
 849 #elif defined (ALPHA)
 850         if (upeek(pid, REG_A3, &a3) < 0)
 851                 return -1;
 852
 853         if (!(tcp->flags & TCB_INSYSCALL)) {
 854                 if (upeek(pid, REG_R0, &scno) < 0)
 855                         return -1;
 856
 857                 /* Check if we return from execve. */
 858                 if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
 859                         tcp->flags &= ~TCB_WAITEXECVE;
 860                         return 0;
 861                 }
 862
 863                 /*
 864                  * Do some sanity checks to figure out if it's
 865                  * really a syscall entry
 866                  */
 867                 if (scno < 0 || scno > nsyscalls) {
 868                         if (a3 == 0 || a3 == -1) {
 869                                 if (debug)
 870                                         fprintf (stderr, "stray syscall exit: r0 = %ld\n", scno);
 871                                 return 0;
 872                         }
 873                 }
 874         }
 875         else {
 876                 if (upeek(pid, REG_R0, &r0) < 0)
 877                         return -1;
 878         }
 879 #elif defined (SPARC)
 880         /* Everything we need is in the current register set. */
 881         if (ptrace(PTRACE_GETREGS,pid,(char *)&regs,0) < 0)
 882                 return -1;
 883
 884         /* If we are entering, then disassemble the syscall trap. */
 885         if (!(tcp->flags & TCB_INSYSCALL)) {
 886                 /* Retrieve the syscall trap instruction. */
 887                 errno = 0;
 888                 trap = ptrace(PTRACE_PEEKTEXT,pid,(char *)regs.r_pc,0);
 889                 if (errno)
 890                         return -1;
 891
 892                 /* Disassemble the trap to see what personality to use. */
 893                 switch (trap) {
 894                 case 0x91d02010:
 895                         /* Linux/SPARC syscall trap. */
 896                         set_personality(0);
 897                         break;
 898                 case 0x91d0206d:
 899                         /* Linux/SPARC64 syscall trap. */
 900                         fprintf(stderr,"syscall: Linux/SPARC64 not supported yet\n");
 901                         return -1;
 902                 case 0x91d02000:
 903                         /* SunOS syscall trap. (pers 1) */
 904                         fprintf(stderr,"syscall: SunOS no support\n");
 905                         return -1;
 906                 case 0x91d02008:
 907                         /* Solaris 2.x syscall trap. (per 2) */
 908                         set_personality(1);
 909                         break;
 910                 case 0x91d02009:
 911                         /* NetBSD/FreeBSD syscall trap. */
 912                         fprintf(stderr,"syscall: NetBSD/FreeBSD not supported\n");
 913                         return -1;
 914                 case 0x91d02027:
 915                         /* Solaris 2.x gettimeofday */
 916                         set_personality(1);
 917                         break;
 918                 default:
 919                         /* Unknown syscall trap. */
 920                         if(tcp->flags & TCB_WAITEXECVE) {
 921                                 tcp->flags &= ~TCB_WAITEXECVE;
 922                                 return 0;
 923                         }
 924                         fprintf(stderr,"syscall: unknown syscall trap %08x %08x\n", trap, regs.r_pc);
 925                         return -1;
 926                 }
 927
 928                 /* Extract the system call number from the registers. */
 929                 if (trap == 0x91d02027)
 930                         scno = 156;
 931                 else
 932                         scno = regs.r_g1;
 933                 if (scno == 0) {
 934                         scno = regs.r_o0;
 935                         memmove (&regs.r_o0, &regs.r_o1, 7*sizeof(regs.r_o0));
 936                 }
 937         }
 938 #elif defined(HPPA)
 939         if (upeek(pid, PT_GR20, &scno) < 0)
 940                 return -1;
 941         if (!(tcp->flags & TCB_INSYSCALL)) {
 942                 /* Check if we return from execve. */
 943                 if ((tcp->flags & TCB_WAITEXECVE)) {
 944                         tcp->flags &= ~TCB_WAITEXECVE;
 945                         return 0;
 946                 }
 947         }
 948 #elif defined(SH)
 949        /*
 950         * In the new syscall ABI, the system call number is in R3.
 951         */
 952        if (upeek(pid, 4*(REG_REG0+3), &scno) < 0)
 953                return -1;
 954
 955        if (scno < 0) {
 956            /* Odd as it may seem, a glibc bug has been known to cause
 957               glibc to issue bogus negative syscall numbers.  So for
 958               our purposes, make strace print what it *should* have been */
 959            long correct_scno = (scno & 0xff);
 960            if (debug)
 961                fprintf(stderr,
 962                    "Detected glibc bug: bogus system call number = %ld, "
 963                    "correcting to %ld\n",
 964                    scno,
 965                    correct_scno);
 966            scno = correct_scno;
 967        }
 968
 969
 970        if (!(tcp->flags & TCB_INSYSCALL)) {
 971                /* Check if we return from execve. */
 972                if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
 973                        tcp->flags &= ~TCB_WAITEXECVE;
 974                        return 0;
 975                }
 976        }
 977 #endif /* SH */
 978 #endif /* LINUX */
 979 #ifdef SUNOS4
 980         if (upeek(pid, uoff(u_arg[7]), &scno) < 0)
 981                 return -1;
 982 #elif defined(SH)
 983        /* new syscall ABI returns result in R0 */
 984        if (upeek(pid, 4*REG_REG0, (long *)&r0) < 0)
 985                return -1;
 986 #endif
 987 #ifdef USE_PROCFS
 988 #ifdef HAVE_PR_SYSCALL
 989         scno = tcp->status.PR_SYSCALL;
 990 #else /* !HAVE_PR_SYSCALL */
 991 #ifndef FREEBSD
 992         scno = tcp->status.PR_WHAT;
 993 #else /* FREEBSD */
 994         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
 995                 perror("pread");
 996                 return -1;
 997         }
 998         switch (regs.r_eax) {
 999         case SYS_syscall:
1000         case SYS___syscall:
1001                 pread(tcp->pfd, &scno, sizeof(scno), regs.r_esp + sizeof(int));
1002                 break;
1003         default:
1004                 scno = regs.r_eax;
1005                 break;
1006         }
1007 #endif /* FREEBSD */
1008 #endif /* !HAVE_PR_SYSCALL */
1009 #endif /* USE_PROCFS */
1010         if (!(tcp->flags & TCB_INSYSCALL))
1011                 tcp->scno = scno;
1012         return 1;
1013 }
1014
1015
1016 int
1017 syscall_fixup(tcp)
1018 struct tcb *tcp;
1019 {
1020 #ifndef USE_PROCFS
1021         int pid = tcp->pid;
1022 #else /* USE_PROCFS */
1023         int scno = tcp->scno;
1024
1025         if (!(tcp->flags & TCB_INSYSCALL)) {
1026                 if (tcp->status.PR_WHY != PR_SYSENTRY) {
1027                         if (
1028                             scno == SYS_fork
1029 #ifdef SYS_vfork
1030                             || scno == SYS_vfork
1031 #endif /* SYS_vfork */
1032 #ifdef SYS_fork1
1033                             || scno == SYS_fork1
1034 #endif /* SYS_fork1 */
1035 #ifdef SYS_forkall
1036                             || scno == SYS_forkall
1037 #endif /* SYS_forkall */
1038 #ifdef SYS_rfork1
1039                             || scno == SYS_rfork1
1040 #endif /* SYS_fork1 */
1041 #ifdef SYS_rforkall
1042                             || scno == SYS_rforkall
1043 #endif /* SYS_rforkall */
1044                             ) {
1045                                 /* We are returning in the child, fake it. */
1046                                 tcp->status.PR_WHY = PR_SYSENTRY;
1047                                 trace_syscall(tcp);
1048                                 tcp->status.PR_WHY = PR_SYSEXIT;
1049                         }
1050                         else {
1051                                 fprintf(stderr, "syscall: missing entry\n");
1052                                 tcp->flags |= TCB_INSYSCALL;
1053                         }
1054                 }
1055         }
1056         else {
1057                 if (tcp->status.PR_WHY != PR_SYSEXIT) {
1058                         fprintf(stderr, "syscall: missing exit\n");
1059                         tcp->flags &= ~TCB_INSYSCALL;
1060                 }
1061         }
1062 #endif /* USE_PROCFS */
1063 #ifdef SUNOS4
1064         if (!(tcp->flags & TCB_INSYSCALL)) {
1065                 if (scno == 0) {
1066                         fprintf(stderr, "syscall: missing entry\n");
1067                         tcp->flags |= TCB_INSYSCALL;
1068                 }
1069         }
1070         else {
1071                 if (scno != 0) {
1072                         if (debug) {
1073                                 /*
1074                                  * This happens when a signal handler
1075                                  * for a signal which interrupted a
1076                                  * a system call makes another system call.
1077                                  */
1078                                 fprintf(stderr, "syscall: missing exit\n");
1079                         }
1080                         tcp->flags &= ~TCB_INSYSCALL;
1081                 }
1082         }
1083 #endif /* SUNOS4 */
1084 #ifdef LINUX
1085 #if defined (I386)
1086         if (upeek(pid, 4*EAX, &eax) < 0)
1087                 return -1;
1088         if (eax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1089                 if (debug)
1090                         fprintf(stderr, "stray syscall exit: eax = %ld\n", eax);
1091                 return 0;
1092         }
1093 #elif defined (X86_64)
1094         if (upeek(pid, 8*RAX, &rax) < 0)
1095                 return -1;
1096         if (rax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1097                 if (debug)
1098                         fprintf(stderr, "stray syscall exit: rax = %ld\n", rax);
1099                 return 0;
1100         }
1101 #elif defined (S390)
1102         if (upeek(pid, PT_GPR2, &gpr2) < 0)
1103                 return -1;
1104         if (gpr2 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1105                 if (debug)
1106                         fprintf(stderr, "stray syscall exit: gpr2 = %ld\n", gpr2);
1107                 return 0;
1108         }
1109 #elif defined (POWERPC)
1110 # define SO_MASK 0x10000000
1111         if (upeek(pid, 4*PT_CCR, &flags) < 0)
1112                 return -1;
1113         if (upeek(pid, 4*PT_R3, &result) < 0)
1114                 return -1;
1115         if (flags & SO_MASK)
1116                 result = -result;
1117 #elif defined (M68K)
1118         if (upeek(pid, 4*PT_D0, &d0) < 0)
1119                 return -1;
1120         if (d0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1121                 if (debug)
1122                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", d0);
1123                 return 0;
1124         }
1125 #elif defined (ARM)
1126         if (upeek(pid, 4*0, (long *)&r0) < 0)
1127                 return -1;
1128         if ( 0 && r0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1129                 if (debug)
1130                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", r0);
1131                 return 0;
1132         }
1133 #elif defined (HPPA)
1134         if (upeek(pid, PT_GR28, &r28) < 0)
1135                 return -1;
1136 #elif defined(IA64)
1137         if (upeek(pid, PT_R10, &r10) < 0)
1138                 return -1;
1139         if (upeek(pid, PT_R8, &r8) < 0)
1140                 return -1;
1141         if (ia32 && r8 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1142                 if (debug)
1143                         fprintf(stderr, "stray syscall exit: r8 = %ld\n", r8);
1144                 return 0;
1145         }
1146 #endif
1147 #endif /* LINUX */
1148         return 1;
1149 }
1150
1151 int
1152 get_error(tcp)
1153 struct tcb *tcp;
1154 {
1155         int u_error = 0;
1156 #ifdef LINUX
1157 #ifdef S390
1158                 if (gpr2 && (unsigned) -gpr2 < nerrnos) {
1159                         tcp->u_rval = -1;
1160                         u_error = -gpr2;
1161                 }
1162                 else {
1163                         tcp->u_rval = gpr2;
1164                         u_error = 0;
1165                 }
1166 #else /* !S390 */
1167 #ifdef I386
1168                 if (eax < 0 && -eax < nerrnos) {
1169                         tcp->u_rval = -1;
1170                         u_error = -eax;
1171                 }
1172                 else {
1173                         tcp->u_rval = eax;
1174                         u_error = 0;
1175                 }
1176 #else /* !I386 */
1177 #ifdef X86_64
1178                 if (rax < 0 && -rax < nerrnos) {
1179                         tcp->u_rval = -1;
1180                         u_error = -rax;
1181                 }
1182                 else {
1183                         tcp->u_rval = rax;
1184                         u_error = 0;
1185                 }
1186 #else
1187 #ifdef IA64
1188                 if (ia32) {
1189                         int err;
1190
1191                         err = (int)r8;
1192                         if (err < 0 && -err < nerrnos) {
1193                                 tcp->u_rval = -1;
1194                                 u_error = -err;
1195                         }
1196                         else {
1197                                 tcp->u_rval = err;
1198                                 u_error = 0;
1199                         }
1200                 } else {
1201                         if (r10) {
1202                                 tcp->u_rval = -1;
1203                                 u_error = r8;
1204                         } else {
1205                                 tcp->u_rval = r8;
1206                                 u_error = 0;
1207                         }
1208                 }
1209 #else /* !IA64 */
1210 #ifdef MIPS
1211                 if (a3) {
1212                         tcp->u_rval = -1;
1213                         u_error = r2;
1214                 } else {
1215                         tcp->u_rval = r2;
1216                         u_error = 0;
1217                 }
1218 #else
1219 #ifdef POWERPC
1220                 if (result && (unsigned) -result < nerrnos) {
1221                         tcp->u_rval = -1;
1222                         u_error = -result;
1223                 }
1224                 else {
1225                         tcp->u_rval = result;
1226                         u_error = 0;
1227                 }
1228 #else /* !POWERPC */
1229 #ifdef M68K
1230                 if (d0 && (unsigned) -d0 < nerrnos) {
1231                         tcp->u_rval = -1;
1232                         u_error = -d0;
1233                 }
1234                 else {
1235                         tcp->u_rval = d0;
1236                         u_error = 0;
1237                 }
1238 #else /* !M68K */
1239 #ifdef ARM
1240                 if (r0 && (unsigned) -r0 < nerrnos) {
1241                         tcp->u_rval = -1;
1242                         u_error = -r0;
1243                 }
1244                 else {
1245                         tcp->u_rval = r0;
1246                         u_error = 0;
1247                 }
1248 #else /* !ARM */
1249 #ifdef ALPHA
1250                 if (a3) {
1251                         tcp->u_rval = -1;
1252                         u_error = r0;
1253                 }
1254                 else {
1255                         tcp->u_rval = r0;
1256                         u_error = 0;
1257                 }
1258 #else /* !ALPHA */
1259 #ifdef SPARC
1260                 if (regs.r_psr & PSR_C) {
1261                         tcp->u_rval = -1;
1262                         u_error = regs.r_o0;
1263                 }
1264                 else {
1265                         tcp->u_rval = regs.r_o0;
1266                         u_error = 0;
1267                 }
1268 #else /* !SPARC */
1269 #ifdef HPPA
1270                 if (r28 && (unsigned) -r28 < nerrnos) {
1271                         tcp->u_rval = -1;
1272                         u_error = -r28;
1273                 }
1274                 else {
1275                         tcp->u_rval = r28;
1276                         u_error = 0;
1277                 }
1278 #else
1279 #ifdef SH
1280                /* interpret R0 as return value or error number */
1281                if (r0 && (unsigned) -r0 < nerrnos) {
1282                        tcp->u_rval = -1;
1283                        u_error = -r0;
1284                }
1285                else {
1286                        tcp->u_rval = r0;
1287                        u_error = 0;
1288                }
1289 #endif /* SH */
1290 #endif /* HPPA */
1291 #endif /* SPARC */
1292 #endif /* ALPHA */
1293 #endif /* ARM */
1294 #endif /* M68K */
1295 #endif /* POWERPC */
1296 #endif /* MIPS */
1297 #endif /* IA64 */
1298 #endif /* X86_64 */
1299 #endif /* I386 */
1300 #endif /* S390 */
1301 #endif /* LINUX */
1302 #ifdef SUNOS4
1303                 /* get error code from user struct */
1304                 if (upeek(pid, uoff(u_error), &u_error) < 0)
1305                         return -1;
1306                 u_error >>= 24; /* u_error is a char */
1307
1308                 /* get system call return value */
1309                 if (upeek(pid, uoff(u_rval1), &tcp->u_rval) < 0)
1310                         return -1;
1311 #endif /* SUNOS4 */
1312 #ifdef SVR4
1313 #ifdef SPARC
1314                 /* Judicious guessing goes a long way. */
1315                 if (tcp->status.pr_reg[R_PSR] & 0x100000) {
1316                         tcp->u_rval = -1;
1317                         u_error = tcp->status.pr_reg[R_O0];
1318                 }
1319                 else {
1320                         tcp->u_rval = tcp->status.pr_reg[R_O0];
1321                         u_error = 0;
1322                 }
1323 #endif /* SPARC */
1324 #ifdef I386
1325                 /* Wanna know how to kill an hour single-stepping? */
1326                 if (tcp->status.PR_REG[EFL] & 0x1) {
1327                         tcp->u_rval = -1;
1328                         u_error = tcp->status.PR_REG[EAX];
1329                 }
1330                 else {
1331                         tcp->u_rval = tcp->status.PR_REG[EAX];
1332 #ifdef HAVE_LONG_LONG
1333                         tcp->u_lrval =
1334                                 ((unsigned long long) tcp->status.PR_REG[EDX] << 32) +
1335                                 tcp->status.PR_REG[EAX];
1336 #endif
1337                         u_error = 0;
1338                 }
1339 #endif /* I386 */
1340 #ifdef X86_64
1341                 /* Wanna know how to kill an hour single-stepping? */
1342                 if (tcp->status.PR_REG[EFLAGS] & 0x1) {
1343                         tcp->u_rval = -1;
1344                         u_error = tcp->status.PR_REG[RAX];
1345                 }
1346                 else {
1347                         tcp->u_rval = tcp->status.PR_REG[RAX];
1348                         u_error = 0;
1349                 }
1350 #endif /* X86_64 */
1351 #ifdef MIPS
1352                 if (tcp->status.pr_reg[CTX_A3]) {
1353                         tcp->u_rval = -1;
1354                         u_error = tcp->status.pr_reg[CTX_V0];
1355                 }
1356                 else {
1357                         tcp->u_rval = tcp->status.pr_reg[CTX_V0];
1358                         u_error = 0;
1359                 }
1360 #endif /* MIPS */
1361 #endif /* SVR4 */
1362 #ifdef FREEBSD
1363                 if (regs.r_eflags & PSL_C) {
1364                         tcp->u_rval = -1;
1365                         u_error = regs.r_eax;
1366                 } else {
1367                         tcp->u_rval = regs.r_eax;
1368                         tcp->u_lrval =
1369                           ((unsigned long long) regs.r_edx << 32) +  regs.r_eax;
1370                         u_error = 0;
1371                 }
1372 #endif /* FREEBSD */
1373         tcp->u_error = u_error;
1374         return 1;
1375 }
1376
1377 int syscall_enter(tcp)
1378 struct tcb *tcp;
1379 {
1380 #ifndef USE_PROCFS
1381         int pid = tcp->pid;
1382 #endif /* !USE_PROCFS */
1383 #ifdef LINUX
1384 #if defined(S390)
1385         {
1386                 int i;
1387                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1388                         tcp->u_nargs = sysent[tcp->scno].nargs;
1389                 else
1390                         tcp->u_nargs = MAX_ARGS;
1391                 for (i = 0; i < tcp->u_nargs; i++) {
1392                         if (upeek(pid,i==0 ? PT_ORIGGPR2:PT_GPR2+(i<<2), &tcp->u_arg[i]) < 0)
1393                                 return -1;
1394                 }
1395         }
1396 #elif defined (ALPHA)
1397         {
1398                 int i;
1399                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1400                         tcp->u_nargs = sysent[tcp->scno].nargs;
1401                 else
1402                         tcp->u_nargs = MAX_ARGS;
1403                 for (i = 0; i < tcp->u_nargs; i++) {
1404                         /* WTA: if scno is out-of-bounds this will bomb. Add range-check
1405                          * for scno somewhere above here!
1406                          */
1407                         if (upeek(pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1408                                 return -1;
1409                 }
1410         }
1411 #elif defined (IA64)
1412         {
1413                 if (!ia32) {
1414                         unsigned long *out0, *rbs_end, cfm, sof, sol, i;
1415                         /* be backwards compatible with kernel < 2.4.4... */
1416 #                       ifndef PT_RBS_END
1417 #                         define PT_RBS_END     PT_AR_BSP
1418 #                       endif
1419
1420                         if (upeek(pid, PT_RBS_END, (long *) &rbs_end) < 0)
1421                                 return -1;
1422                         if (upeek(pid, PT_CFM, (long *) &cfm) < 0)
1423                                 return -1;
1424
1425                         sof = (cfm >> 0) & 0x7f;
1426                         sol = (cfm >> 7) & 0x7f;
1427                         out0 = ia64_rse_skip_regs(rbs_end, -sof + sol);
1428
1429                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1430                             && sysent[tcp->scno].nargs != -1)
1431                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1432                         else
1433                                 tcp->u_nargs = MAX_ARGS;
1434                         for (i = 0; i < tcp->u_nargs; ++i) {
1435                                 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1436                                            sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1437                                         return -1;
1438                         }
1439                 } else {
1440                         int i;
1441
1442                         if (/* EBX = out0 */
1443                             upeek(pid, PT_R11, (long *) &tcp->u_arg[0]) < 0
1444                             /* ECX = out1 */
1445                             || upeek(pid, PT_R9,  (long *) &tcp->u_arg[1]) < 0
1446                             /* EDX = out2 */
1447                             || upeek(pid, PT_R10, (long *) &tcp->u_arg[2]) < 0
1448                             /* ESI = out3 */
1449                             || upeek(pid, PT_R14, (long *) &tcp->u_arg[3]) < 0
1450                             /* EDI = out4 */
1451                             || upeek(pid, PT_R15, (long *) &tcp->u_arg[4]) < 0
1452                             /* EBP = out5 */
1453                             || upeek(pid, PT_R13, (long *) &tcp->u_arg[5]) < 0)
1454                                 return -1;
1455
1456                         for (i = 0; i < 6; ++i)
1457                                 /* truncate away IVE sign-extension */
1458                                 tcp->u_arg[i] &= 0xffffffff;
1459
1460                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1461                             && sysent[tcp->scno].nargs != -1)
1462                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1463                         else
1464                                 tcp->u_nargs = 5;
1465                 }
1466         }
1467 #elif defined (MIPS)
1468         {
1469                 long sp;
1470                 int i, nargs;
1471
1472                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1473                         nargs = tcp->u_nargs = sysent[tcp->scno].nargs;
1474                 else
1475                         nargs = tcp->u_nargs = MAX_ARGS;
1476                 if(nargs > 4) {
1477                         if(upeek(pid, REG_SP, &sp) < 0)
1478                                 return -1;
1479                         for(i = 0; i < 4; i++) {
1480                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i])<0)
1481                                         return -1;
1482                         }
1483                         umoven(tcp, sp+16, (nargs-4) * sizeof(tcp->u_arg[0]),
1484                                (char *)(tcp->u_arg + 4));
1485                 } else {
1486                         for(i = 0; i < nargs; i++) {
1487                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1488                                         return -1;
1489                         }
1490                 }
1491         }
1492 #elif defined (POWERPC)
1493         {
1494                 int i;
1495                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1496                         tcp->u_nargs = sysent[tcp->scno].nargs;
1497                 else
1498                         tcp->u_nargs = MAX_ARGS;
1499                 for (i = 0; i < tcp->u_nargs; i++) {
1500                         if (upeek(pid, (i==0) ? (4*PT_ORIG_R3) : ((i+PT_R3)*4), &tcp->u_arg[i]) < 0)
1501                                 return -1;
1502                 }
1503         }
1504 #elif defined (SPARC)
1505         {
1506                 int i;
1507
1508                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1509                         tcp->u_nargs = sysent[tcp->scno].nargs;
1510                 else
1511                         tcp->u_nargs = MAX_ARGS;
1512                 for (i = 0; i < tcp->u_nargs; i++)
1513                         tcp->u_arg[i] = *((&regs.r_o0) + i);
1514         }
1515 #elif defined (HPPA)
1516         {
1517                 int i;
1518
1519                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1520                         tcp->u_nargs = sysent[tcp->scno].nargs;
1521                 else
1522                         tcp->u_nargs = MAX_ARGS;
1523                 for (i = 0; i < tcp->u_nargs; i++) {
1524                         if (upeek(pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1525                                 return -1;
1526                 }
1527         }
1528 #elif defined(SH)
1529        {
1530                int i;
1531                static int syscall_regs[] = {
1532                    REG_REG0+4, REG_REG0+5, REG_REG0+6, REG_REG0+7,
1533                    REG_REG0, REG_REG0+1, REG_REG0+2
1534                    };
1535
1536                tcp->u_nargs = sysent[tcp->scno].nargs;
1537                for (i = 0; i < tcp->u_nargs; i++) {
1538                        if (upeek(pid, 4*syscall_regs[i], &tcp->u_arg[i]) < 0)
1539                                return -1;
1540                }
1541         }
1542 #elif defined(X86_64)
1543         {
1544                 int i;
1545                 static int argreg[SUPPORTED_PERSONALITIES][MAX_ARGS] = {
1546                         {RDI,RSI,RDX,R10,R8,R9},        /* x86-64 ABI */
1547                         {RBX,RCX,RDX,RDX,RSI,RDI,RBP}   /* i386 ABI */
1548                 };
1549
1550                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1551                         tcp->u_nargs = sysent[tcp->scno].nargs;
1552                 else
1553                         tcp->u_nargs = MAX_ARGS;
1554                 for (i = 0; i < tcp->u_nargs; i++) {
1555                         if (upeek(pid, argreg[current_personality][i]*8, &tcp->u_arg[i]) < 0)
1556                                 return -1;
1557                 }
1558         }
1559 #else /* Other architecture (like i386) (32bits specific) */
1560         {
1561                 int i;
1562                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1563                         tcp->u_nargs = sysent[tcp->scno].nargs;
1564                 else
1565                         tcp->u_nargs = MAX_ARGS;
1566                 for (i = 0; i < tcp->u_nargs; i++) {
1567                         if (upeek(pid, i*4, &tcp->u_arg[i]) < 0)
1568                                 return -1;
1569                 }
1570         }
1571 #endif
1572 #endif /* LINUX */
1573 #ifdef SUNOS4
1574         {
1575                 int i;
1576                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1577                         tcp->u_nargs = sysent[tcp->scno].nargs;
1578                 else
1579                         tcp->u_nargs = MAX_ARGS;
1580                 for (i = 0; i < tcp->u_nargs; i++) {
1581                         struct user *u;
1582
1583                         if (upeek(pid, uoff(u_arg[0]) +
1584                             (i*sizeof(u->u_arg[0])), &tcp->u_arg[i]) < 0)
1585                                 return -1;
1586                 }
1587         }
1588 #endif /* SUNOS4 */
1589 #ifdef SVR4
1590 #ifdef MIPS
1591         /*
1592          * SGI is broken: even though it has pr_sysarg, it doesn't
1593          * set them on system call entry.  Get a clue.
1594          */
1595         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1596                 tcp->u_nargs = sysent[tcp->scno].nargs;
1597         else
1598                 tcp->u_nargs = tcp->status.pr_nsysarg;
1599         if (tcp->u_nargs > 4) {
1600                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1601                         4*sizeof(tcp->u_arg[0]));
1602                 umoven(tcp, tcp->status.pr_reg[CTX_SP] + 16,
1603                         (tcp->u_nargs - 4)*sizeof(tcp->u_arg[0]), (char *) (tcp->u_arg + 4));
1604         }
1605         else {
1606                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1607                         tcp->u_nargs*sizeof(tcp->u_arg[0]));
1608         }
1609 #elif UNIXWARE >= 2
1610         /*
1611          * Like SGI, UnixWare doesn't set pr_sysarg until system call exit
1612          */
1613         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1614                 tcp->u_nargs = sysent[tcp->scno].nargs;
1615         else
1616                 tcp->u_nargs = tcp->status.pr_lwp.pr_nsysarg;
1617         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
1618                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
1619 #elif defined (HAVE_PR_SYSCALL)
1620         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1621                 tcp->u_nargs = sysent[tcp->scno].nargs;
1622         else
1623                 tcp->u_nargs = tcp->status.pr_nsysarg;
1624         {
1625                 int i;
1626                 for (i = 0; i < tcp->u_nargs; i++)
1627                         tcp->u_arg[i] = tcp->status.pr_sysarg[i];
1628         }
1629 #elif defined (I386)
1630         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1631                 tcp->u_nargs = sysent[tcp->scno].nargs;
1632         else
1633                 tcp->u_nargs = 5;
1634         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
1635                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
1636 #else
1637         I DONT KNOW WHAT TO DO
1638 #endif /* !HAVE_PR_SYSCALL */
1639 #endif /* SVR4 */
1640 #ifdef FREEBSD
1641         if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
1642             sysent[tcp->scno].nargs > tcp->status.val)
1643                 tcp->u_nargs = sysent[tcp->scno].nargs;
1644         else
1645                 tcp->u_nargs = tcp->status.val;
1646         if (tcp->u_nargs < 0)
1647                 tcp->u_nargs = 0;
1648         if (tcp->u_nargs > MAX_ARGS)
1649                 tcp->u_nargs = MAX_ARGS;
1650         switch(regs.r_eax) {
1651         case SYS___syscall:
1652                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1653                       regs.r_esp + sizeof(int) + sizeof(quad_t));
1654           break;
1655         case SYS_syscall:
1656                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1657                       regs.r_esp + 2 * sizeof(int));
1658           break;
1659         default:
1660                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1661                       regs.r_esp + sizeof(int));
1662           break;
1663         }
1664 #endif /* FREEBSD */
1665         return 1;
1666 }
1667
1668 int
1669 trace_syscall(tcp)
1670 struct tcb *tcp;
1671 {
1672         int sys_res;
1673         struct timeval tv;
1674         int res;
1675
1676         /* Measure the exit time as early as possible to avoid errors. */
1677         if (dtime && (tcp->flags & TCB_INSYSCALL))
1678                 gettimeofday(&tv, NULL);
1679
1680         res = get_scno(tcp);
1681         if (res != 1)
1682                 return res;
1683
1684         res = syscall_fixup(tcp);
1685         if (res != 1)
1686                 return res;
1687
1688         if (tcp->flags & TCB_INSYSCALL) {
1689                 long u_error;
1690                 res = get_error(tcp);
1691                 if (res != 1)
1692                         return res;
1693                 u_error = tcp->u_error;
1694
1695
1696                 internal_syscall(tcp);
1697                 if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
1698                     !(qual_flags[tcp->scno] & QUAL_TRACE)) {
1699                         tcp->flags &= ~TCB_INSYSCALL;
1700                         return 0;
1701                 }
1702
1703                 if (tcp->flags & TCB_REPRINT) {
1704                         printleader(tcp);
1705                         tprintf("<... ");
1706                         if (tcp->scno >= nsyscalls || tcp->scno < 0)
1707                                 tprintf("syscall_%lu", tcp->scno);
1708                         else
1709                                 tprintf("%s", sysent[tcp->scno].sys_name);
1710                         tprintf(" resumed> ");
1711                 }
1712
1713                 if (cflag && tcp->scno < nsyscalls && tcp->scno >= 0) {
1714                         call_count[tcp->scno]++;
1715                         if (tcp->u_error)
1716                                 error_count[tcp->scno]++;
1717                         tv_sub(&tv, &tv, &tcp->etime);
1718 #ifdef LINUX
1719                         if (tv_cmp(&tv, &tcp->dtime) > 0) {
1720                                 static struct timeval one_tick =
1721                                         { 0, 1000000 / HZ };
1722
1723                                 if (tv_nz(&tcp->dtime))
1724                                         tv = tcp->dtime;
1725                                 else if (tv_cmp(&tv, &one_tick) > 0) {
1726                                         if (tv_cmp(&shortest, &one_tick) < 0)
1727                                                 tv = shortest;
1728                                         else
1729                                                 tv = one_tick;
1730                                 }
1731                         }
1732 #endif /* LINUX */
1733                         if (tv_cmp(&tv, &shortest) < 0)
1734                                 shortest = tv;
1735                         tv_add(&tv_count[tcp->scno],
1736                                 &tv_count[tcp->scno], &tv);
1737                         tcp->flags &= ~TCB_INSYSCALL;
1738                         return 0;
1739                 }
1740
1741                 if (tcp->scno >= nsyscalls || tcp->scno < 0
1742                     || (qual_flags[tcp->scno] & QUAL_RAW))
1743                         sys_res = printargs(tcp);
1744                 else
1745                         sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1746                 u_error = tcp->u_error;
1747                 tprintf(") ");
1748                 tabto(acolumn);
1749                 if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
1750                     qual_flags[tcp->scno] & QUAL_RAW) {
1751                         if (u_error)
1752                                 tprintf("= -1 (errno %ld)", u_error);
1753                         else
1754                                 tprintf("= %#lx", tcp->u_rval);
1755                 }
1756                 else if (!(sys_res & RVAL_NONE) && u_error) {
1757                         switch (u_error) {
1758 #ifdef LINUX
1759                         case ERESTARTSYS:
1760                                 tprintf("= ? ERESTARTSYS (To be restarted)");
1761                                 break;
1762                         case ERESTARTNOINTR:
1763                                 tprintf("= ? ERESTARTNOINTR (To be restarted)");
1764                                 break;
1765                         case ERESTARTNOHAND:
1766                                 tprintf("= ? ERESTARTNOHAND (To be restarted)");
1767                                 break;
1768 #endif /* LINUX */
1769                         default:
1770                                 tprintf("= -1 ");
1771                                 if (u_error < 0)
1772                                         tprintf("E??? (errno %ld)", u_error);
1773                                 else if (u_error < nerrnos && u_error < sys_nerr)
1774                                         tprintf("%s (%s)", errnoent[u_error],
1775                                                 sys_errlist[u_error]);
1776                                 else if (u_error < nerrnos)
1777                                         tprintf("%s (errno %ld)",
1778                                                 errnoent[u_error], u_error);
1779                                 else if (u_error < sys_nerr)
1780                                         tprintf("ERRNO_%ld (%s)", u_error,
1781                                                 sys_errlist[u_error]);
1782                                 else
1783                                         tprintf("E??? (errno %ld)", u_error);
1784                                 break;
1785                         }
1786                 }
1787                 else {
1788                         if (sys_res & RVAL_NONE)
1789                                 tprintf("= ?");
1790                         else {
1791                                 switch (sys_res & RVAL_MASK) {
1792                                 case RVAL_HEX:
1793                                         tprintf("= %#lx", tcp->u_rval);
1794                                         break;
1795                                 case RVAL_OCTAL:
1796                                         tprintf("= %#lo", tcp->u_rval);
1797                                         break;
1798                                 case RVAL_UDECIMAL:
1799                                         tprintf("= %lu", tcp->u_rval);
1800                                         break;
1801                                 case RVAL_DECIMAL:
1802                                         tprintf("= %ld", tcp->u_rval);
1803                                         break;
1804 #ifdef HAVE_LONG_LONG
1805                                 case RVAL_LHEX:
1806                                         tprintf("= %#llx", tcp->u_lrval);
1807                                         break;
1808                                 case RVAL_LOCTAL:
1809                                         tprintf("= %#llo", tcp->u_lrval);
1810                                         break;
1811                                 case RVAL_LUDECIMAL:
1812                                         tprintf("= %llu", tcp->u_lrval);
1813                                         break;
1814                                 case RVAL_LDECIMAL:
1815                                         tprintf("= %lld", tcp->u_lrval);
1816                                         break;
1817 #endif
1818                                 default:
1819                                         fprintf(stderr,
1820                                                 "invalid rval format\n");
1821                                         break;
1822                                 }
1823                         }
1824                         if ((sys_res & RVAL_STR) && tcp->auxstr)
1825                                 tprintf(" (%s)", tcp->auxstr);
1826                 }
1827                 if (dtime) {
1828                         tv_sub(&tv, &tv, &tcp->etime);
1829                         tprintf(" <%ld.%06ld>",
1830                                 (long) tv.tv_sec, (long) tv.tv_usec);
1831                 }
1832                 printtrailer(tcp);
1833
1834                 dumpio(tcp);
1835                 if (fflush(tcp->outf) == EOF)
1836                         return -1;
1837                 tcp->flags &= ~TCB_INSYSCALL;
1838                 return 0;
1839         }
1840
1841         /* Entering system call */
1842         res = syscall_enter(tcp);
1843         if (res != 1)
1844                 return res;
1845
1846         switch (tcp->scno + NR_SYSCALL_BASE) {
1847 #ifdef LINUX
1848 #if !defined (ALPHA) && !defined(SPARC) && !defined(MIPS) && !defined(HPPA) && !defined(X86_64)
1849         case SYS_socketcall:
1850                 decode_subcall(tcp, SYS_socket_subcall,
1851                         SYS_socket_nsubcalls, deref_style);
1852                 break;
1853         case SYS_ipc:
1854                 decode_subcall(tcp, SYS_ipc_subcall,
1855                         SYS_ipc_nsubcalls, shift_style);
1856                 break;
1857 #endif /* !ALPHA && !MIPS && !SPARC && !HPPA && !X86_64 */
1858 #ifdef SPARC
1859         case SYS_socketcall:
1860                 sparc_socket_decode (tcp);
1861                 break;
1862 #endif
1863 #endif /* LINUX */
1864 #ifdef SVR4
1865 #ifdef SYS_pgrpsys_subcall
1866         case SYS_pgrpsys:
1867                 decode_subcall(tcp, SYS_pgrpsys_subcall,
1868                         SYS_pgrpsys_nsubcalls, shift_style);
1869                 break;
1870 #endif /* SYS_pgrpsys_subcall */
1871 #ifdef SYS_sigcall_subcall
1872         case SYS_sigcall:
1873                 decode_subcall(tcp, SYS_sigcall_subcall,
1874                         SYS_sigcall_nsubcalls, mask_style);
1875                 break;
1876 #endif /* SYS_sigcall_subcall */
1877         case SYS_msgsys:
1878                 decode_subcall(tcp, SYS_msgsys_subcall,
1879                         SYS_msgsys_nsubcalls, shift_style);
1880                 break;
1881         case SYS_shmsys:
1882                 decode_subcall(tcp, SYS_shmsys_subcall,
1883                         SYS_shmsys_nsubcalls, shift_style);
1884                 break;
1885         case SYS_semsys:
1886                 decode_subcall(tcp, SYS_semsys_subcall,
1887                         SYS_semsys_nsubcalls, shift_style);
1888                 break;
1889 #if 0 /* broken */
1890         case SYS_utssys:
1891                 decode_subcall(tcp, SYS_utssys_subcall,
1892                         SYS_utssys_nsubcalls, shift_style);
1893                 break;
1894 #endif
1895         case SYS_sysfs:
1896                 decode_subcall(tcp, SYS_sysfs_subcall,
1897                         SYS_sysfs_nsubcalls, shift_style);
1898                 break;
1899         case SYS_spcall:
1900                 decode_subcall(tcp, SYS_spcall_subcall,
1901                         SYS_spcall_nsubcalls, shift_style);
1902                 break;
1903 #ifdef SYS_context_subcall
1904         case SYS_context:
1905                 decode_subcall(tcp, SYS_context_subcall,
1906                         SYS_context_nsubcalls, shift_style);
1907                 break;
1908 #endif /* SYS_context_subcall */
1909 #ifdef SYS_door_subcall
1910         case SYS_door:
1911                 decode_subcall(tcp, SYS_door_subcall,
1912                         SYS_door_nsubcalls, door_style);
1913                 break;
1914 #endif /* SYS_door_subcall */
1915 #ifdef SYS_kaio_subcall
1916         case SYS_kaio:
1917                 decode_subcall(tcp, SYS_kaio_subcall,
1918                         SYS_kaio_nsubcalls, shift_style);
1919                 break;
1920 #endif
1921 #endif /* SVR4 */
1922 #ifdef FREEBSD
1923         case SYS_msgsys:
1924         case SYS_shmsys:
1925         case SYS_semsys:
1926                 decode_subcall(tcp, 0, 0, table_style);
1927                 break;
1928 #endif
1929 #ifdef SUNOS4
1930         case SYS_semsys:
1931                 decode_subcall(tcp, SYS_semsys_subcall,
1932                         SYS_semsys_nsubcalls, shift_style);
1933                 break;
1934         case SYS_msgsys:
1935                 decode_subcall(tcp, SYS_msgsys_subcall,
1936                         SYS_msgsys_nsubcalls, shift_style);
1937                 break;
1938         case SYS_shmsys:
1939                 decode_subcall(tcp, SYS_shmsys_subcall,
1940                         SYS_shmsys_nsubcalls, shift_style);
1941                 break;
1942 #endif
1943         }
1944
1945         internal_syscall(tcp);
1946         if (tcp->scno >=0 && tcp->scno < nsyscalls && !(qual_flags[tcp->scno] & QUAL_TRACE)) {
1947                 tcp->flags |= TCB_INSYSCALL;
1948                 return 0;
1949         }
1950
1951         if (cflag) {
1952                 gettimeofday(&tcp->etime, NULL);
1953                 tcp->flags |= TCB_INSYSCALL;
1954                 return 0;
1955         }
1956
1957         printleader(tcp);
1958         tcp->flags &= ~TCB_REPRINT;
1959         tcp_last = tcp;
1960         if (tcp->scno >= nsyscalls || tcp->scno < 0)
1961                 tprintf("syscall_%lu(", tcp->scno);
1962         else
1963                 tprintf("%s(", sysent[tcp->scno].sys_name);
1964         if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
1965             ((qual_flags[tcp->scno] & QUAL_RAW) && tcp->scno != SYS_exit))
1966                 sys_res = printargs(tcp);
1967         else
1968                 sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1969         if (fflush(tcp->outf) == EOF)
1970                 return -1;
1971         tcp->flags |= TCB_INSYSCALL;
1972         /* Measure the entrance time as late as possible to avoid errors. */
1973         if (dtime)
1974                 gettimeofday(&tcp->etime, NULL);
1975         return sys_res;
1976 }
1977
1978 int
1979 printargs(tcp)
1980 struct tcb *tcp;
1981 {
1982         if (entering(tcp)) {
1983                 int i;
1984
1985                 for (i = 0; i < tcp->u_nargs; i++)
1986                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
1987         }
1988         return 0;
1989 }
1990
1991 long
1992 getrval2(tcp)
1993 struct tcb *tcp;
1994 {
1995         long val = -1;
1996
1997 #ifdef LINUX
1998 #ifdef SPARC
1999         struct regs regs;
2000         if (ptrace(PTRACE_GETREGS,tcp->pid,(char *)&regs,0) < 0)
2001                 return -1;
2002         val = regs.r_o1;
2003 #endif /* SPARC */
2004 #endif /* LINUX */
2005
2006 #ifdef SUNOS4
2007         if (upeek(tcp->pid, uoff(u_rval2), &val) < 0)
2008                 return -1;
2009 #endif /* SUNOS4 */
2010
2011 #ifdef SVR4
2012 #ifdef SPARC
2013         val = tcp->status.PR_REG[R_O1];
2014 #endif /* SPARC */
2015 #ifdef I386
2016         val = tcp->status.PR_REG[EDX];
2017 #endif /* I386 */
2018 #ifdef X86_64
2019         val = tcp->status.PR_REG[RDX];
2020 #endif /* X86_64 */
2021 #ifdef MIPS
2022         val = tcp->status.PR_REG[CTX_V1];
2023 #endif /* MIPS */
2024 #endif /* SVR4 */
2025 #ifdef FREEBSD
2026         struct reg regs;
2027         pread(tcp->pfd_reg, &regs, sizeof(regs), 0);
2028         val = regs.r_edx;
2029 #endif
2030         return val;
2031 }
2032
2033 /*
2034  * Apparently, indirect system calls have already be converted by ptrace(2),
2035  * so if you see "indir" this program has gone astray.
2036  */
2037 int
2038 sys_indir(tcp)
2039 struct tcb *tcp;
2040 {
2041         int i, scno, nargs;
2042
2043         if (entering(tcp)) {
2044                 if ((scno = tcp->u_arg[0]) > nsyscalls) {
2045                         fprintf(stderr, "Bogus syscall: %u\n", scno);
2046                         return 0;
2047                 }
2048                 nargs = sysent[scno].nargs;
2049                 tprintf("%s", sysent[scno].sys_name);
2050                 for (i = 0; i < nargs; i++)
2051                         tprintf(", %#lx", tcp->u_arg[i+1]);
2052         }
2053         return 0;
2054 }
2055
2056 static int
2057 time_cmp(a, b)
2058 void *a;
2059 void *b;
2060 {
2061         return -tv_cmp(&tv_count[*((int *) a)], &tv_count[*((int *) b)]);
2062 }
2063
2064 static int
2065 syscall_cmp(a, b)
2066 void *a;
2067 void *b;
2068 {
2069         return strcmp(sysent[*((int *) a)].sys_name,
2070                 sysent[*((int *) b)].sys_name);
2071 }
2072
2073 static int
2074 count_cmp(a, b)
2075 void *a;
2076 void *b;
2077 {
2078         int m = call_count[*((int *) a)], n = call_count[*((int *) b)];
2079
2080         return (m < n) ? 1 : (m > n) ? -1 : 0;
2081 }
2082
2083 static int (*sortfun)();
2084 static struct timeval overhead = { -1, -1 };
2085
2086 void
2087 set_sortby(sortby)
2088 char *sortby;
2089 {
2090         if (strcmp(sortby, "time") == 0)
2091                 sortfun = time_cmp;
2092         else if (strcmp(sortby, "calls") == 0)
2093                 sortfun = count_cmp;
2094         else if (strcmp(sortby, "name") == 0)
2095                 sortfun = syscall_cmp;
2096         else if (strcmp(sortby, "nothing") == 0)
2097                 sortfun = NULL;
2098         else {
2099                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
2100                 exit(1);
2101         }
2102 }
2103
2104 void set_overhead(n)
2105 int n;
2106 {
2107         overhead.tv_sec = n / 1000000;
2108         overhead.tv_usec = n % 1000000;
2109 }
2110
2111 void
2112 call_summary(outf)
2113 FILE *outf;
2114 {
2115         int i, j;
2116         int call_cum, error_cum;
2117         struct timeval tv_cum, dtv;
2118         double percent;
2119         char *dashes = "-------------------------";
2120         char error_str[16];
2121
2122         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
2123         if (overhead.tv_sec == -1) {
2124                 tv_mul(&overhead, &shortest, 8);
2125                 tv_div(&overhead, &overhead, 10);
2126         }
2127         for (i = 0; i < nsyscalls; i++) {
2128                 sorted_count[i] = i;
2129                 if (call_count[i] == 0)
2130                         continue;
2131                 tv_mul(&dtv, &overhead, call_count[i]);
2132                 tv_sub(&tv_count[i], &tv_count[i], &dtv);
2133                 call_cum += call_count[i];
2134                 error_cum += error_count[i];
2135                 tv_add(&tv_cum, &tv_cum, &tv_count[i]);
2136         }
2137         if (sortfun)
2138                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
2139         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
2140                 "% time", "seconds", "usecs/call",
2141                 "calls", "errors", "syscall");
2142         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2143                 dashes, dashes, dashes, dashes, dashes, dashes);
2144         for (i = 0; i < nsyscalls; i++) {
2145                 j = sorted_count[i];
2146                 if (call_count[j] == 0)
2147                         continue;
2148                 tv_div(&dtv, &tv_count[j], call_count[j]);
2149                 if (error_count[j])
2150                         sprintf(error_str, "%d", error_count[j]);
2151                 else
2152                         error_str[0] = '\0';
2153                 percent = 100.0*tv_float(&tv_count[j])/tv_float(&tv_cum);
2154                 fprintf(outf, "%6.2f %4ld.%06ld %11ld %9d %9.9s %s\n",
2155                         percent, (long) tv_count[j].tv_sec,
2156                         (long) tv_count[j].tv_usec,
2157                         (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
2158                         call_count[j], error_str, sysent[j].sys_name);
2159         }
2160         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2161                 dashes, dashes, dashes, dashes, dashes, dashes);
2162         if (error_cum)
2163                 sprintf(error_str, "%d", error_cum);
2164         else
2165                 error_str[0] = '\0';
2166         fprintf(outf, "%6.6s %4ld.%06ld %11.11s %9d %9.9s %s\n",
2167                 "100.00", (long) tv_cum.tv_sec, (long) tv_cum.tv_usec, "",
2168                 call_cum, error_str, "total");
2169 }