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