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   { SYS_semsys, 4, { SYS___semctl, SYS_semget, SYS_semop, SYS_semconfig } },
 427   { SYS_msgsys, 4, { SYS_msgctl, SYS_msgget, SYS_msgsnd, SYS_msgrcv } },
 428 };
 429 #endif /* FREEBSD */
 430
 431 #if !(defined(LINUX) && ( defined(ALPHA) || defined(IA64) || defined(MIPS) ))
 432
 433 const int socket_map [] = {
 434                /* SYS_SOCKET      */ 97,
 435                /* SYS_BIND        */ 104,
 436                /* SYS_CONNECT     */ 98,
 437                /* SYS_LISTEN      */ 106,
 438                /* SYS_ACCEPT      */ 99,
 439                /* SYS_GETSOCKNAME */ 150,
 440                /* SYS_GETPEERNAME */ 141,
 441                /* SYS_SOCKETPAIR  */ 135,
 442                /* SYS_SEND        */ 101,
 443                /* SYS_RECV        */ 102,
 444                /* SYS_SENDTO      */ 133,
 445                /* SYS_RECVFROM    */ 125,
 446                /* SYS_SHUTDOWN    */ 134,
 447                /* SYS_SETSOCKOPT  */ 105,
 448                /* SYS_GETSOCKOPT  */ 118,
 449                /* SYS_SENDMSG     */ 114,
 450                /* SYS_RECVMSG     */ 113
 451 };
 452
 453 void
 454 sparc_socket_decode (tcp)
 455 struct tcb *tcp;
 456 {
 457         volatile long addr;
 458         volatile int i, n;
 459
 460         if (tcp->u_arg [0] < 1 || tcp->u_arg [0] > sizeof(socket_map)/sizeof(int)+1){
 461                 return;
 462         }
 463         tcp->scno = socket_map [tcp->u_arg [0]-1];
 464         n = tcp->u_nargs = sysent [tcp->scno].nargs;
 465         addr = tcp->u_arg [1];
 466         for (i = 0; i < n; i++){
 467                 int arg;
 468                 if (umoven (tcp, addr, sizeof (arg), (void *) &arg) < 0)
 469                         arg = 0;
 470                 tcp->u_arg [i] = arg;
 471                 addr += sizeof (arg);
 472         }
 473 }
 474
 475 static void
 476 decode_subcall(tcp, subcall, nsubcalls, style)
 477 struct tcb *tcp;
 478 int subcall;
 479 int nsubcalls;
 480 enum subcall_style style;
 481 {
 482         int i, addr, mask, arg;
 483
 484 #ifndef FREEBSD
 485         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 486                 return;
 487 #endif
 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 #endif
 637 #endif /* LINUX */
 638 #ifdef FREEBSD
 639         struct reg regs;
 640 #endif /* FREEBSD */
 641
 642 int
 643 get_scno(tcp)
 644 struct tcb *tcp;
 645 {
 646         long scno = 0;
 647 #ifndef USE_PROCFS
 648         int pid = tcp->pid;
 649 #endif /* !PROCFS */
 650
 651 #ifdef LINUX
 652 #if defined(S390)
 653         if (upeek(tcp->pid,PT_PSWADDR,&pc) < 0)
 654                 return -1;
 655         scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(pc-4),0);
 656         if (errno)
 657                 return -1;
 658         scno&=0xFF;
 659 #elif defined (POWERPC)
 660         if (upeek(pid, 4*PT_R0, &scno) < 0)
 661                 return -1;
 662         if (!(tcp->flags & TCB_INSYSCALL)) {
 663                 /* Check if we return from execve. */
 664                 if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 665                         tcp->flags &= ~TCB_WAITEXECVE;
 666                         return 0;
 667                 }
 668         }
 669 #elif defined (I386)
 670         if (upeek(pid, 4*ORIG_EAX, &scno) < 0)
 671                 return -1;
 672 #elif defined(IA64)
 673 #define IA64_PSR_IS     ((long)1 << 34)
 674         if (upeek (pid, PT_CR_IPSR, &psr) >= 0)
 675                 ia32 = (psr & IA64_PSR_IS);
 676         if (!(tcp->flags & TCB_INSYSCALL)) {
 677                 if (ia32) {
 678                         if (upeek(pid, PT_R8, &scno) < 0)
 679                                 return -1;
 680                 } else {
 681                         if (upeek (pid, PT_R15, &scno) < 0)
 682                                 return -1;
 683                 }
 684         } else {
 685                 /* syscall in progress */
 686                 if (upeek (pid, PT_R8, &r8) < 0)
 687                         return -1;
 688                 if (upeek (pid, PT_R10, &r10) < 0)
 689                         return -1;
 690         }
 691 #elif defined (ARM)
 692         {
 693             long pc;
 694             upeek(pid, 4*15, &pc);
 695             umoven(tcp, pc-4, 4, (char *)&scno);
 696             scno &= 0x000fffff;
 697         }
 698 #elif defined (M68K)
 699         if (upeek(pid, 4*PT_ORIG_D0, &scno) < 0)
 700                 return -1;
 701 #elif defined (MIPS)
 702         if (upeek(pid, REG_A3, &a3) < 0)
 703                 return -1;
 704
 705         if(!(tcp->flags & TCB_INSYSCALL)) {
 706                 if (upeek(pid, REG_V0, &scno) < 0)
 707                         return -1;
 708
 709                 if (scno < 0 || scno > nsyscalls) {
 710                         if(a3 == 0 || a3 == -1) {
 711                                 if(debug)
 712                                         fprintf (stderr, "stray syscall exit: v0 = %ld\n", scno);
 713                                 return 0;
 714                         }
 715                 }
 716         } else {
 717                 if (upeek(pid, REG_V0, &r2) < 0)
 718                         return -1;
 719         }
 720 #elif defined (ALPHA)
 721         if (upeek(pid, REG_A3, &a3) < 0)
 722                 return -1;
 723
 724         if (!(tcp->flags & TCB_INSYSCALL)) {
 725                 if (upeek(pid, REG_R0, &scno) < 0)
 726                         return -1;
 727
 728                 /* Check if we return from execve. */
 729                 if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
 730                         tcp->flags &= ~TCB_WAITEXECVE;
 731                         return 0;
 732                 }
 733
 734                 /*
 735                  * Do some sanity checks to figure out if it's
 736                  * really a syscall entry
 737                  */
 738                 if (scno < 0 || scno > nsyscalls) {
 739                         if (a3 == 0 || a3 == -1) {
 740                                 if (debug)
 741                                         fprintf (stderr, "stray syscall exit: r0 = %ld\n", scno);
 742                                 return 0;
 743                         }
 744                 }
 745         }
 746         else {
 747                 if (upeek(pid, REG_R0, &r0) < 0)
 748                         return -1;
 749         }
 750 #elif defined (SPARC)
 751         /* Everything we need is in the current register set. */
 752         if (ptrace(PTRACE_GETREGS,pid,(char *)&regs,0) < 0)
 753                 return -1;
 754
 755         /* If we are entering, then disassemble the syscall trap. */
 756         if (!(tcp->flags & TCB_INSYSCALL)) {
 757                 /* Retrieve the syscall trap instruction. */
 758                 errno = 0;
 759                 trap = ptrace(PTRACE_PEEKTEXT,pid,(char *)regs.r_pc,0);
 760                 if (errno)
 761                         return -1;
 762
 763                 /* Disassemble the trap to see what personality to use. */
 764                 switch (trap) {
 765                 case 0x91d02010:
 766                         /* Linux/SPARC syscall trap. */
 767                         set_personality(0);
 768                         break;
 769                 case 0x91d0206d:
 770                         /* Linux/SPARC64 syscall trap. */
 771                         fprintf(stderr,"syscall: Linux/SPARC64 not supported yet\n");
 772                         return -1;
 773                 case 0x91d02000:
 774                         /* SunOS syscall trap. (pers 1) */
 775                         fprintf(stderr,"syscall: SunOS no support\n");
 776                         return -1;
 777                 case 0x91d02008:
 778                         /* Solaris 2.x syscall trap. (per 2) */
 779                         set_personality(1);
 780                         break;
 781                 case 0x91d02009:
 782                         /* NetBSD/FreeBSD syscall trap. */
 783                         fprintf(stderr,"syscall: NetBSD/FreeBSD not supported\n");
 784                         return -1;
 785                 case 0x91d02027:
 786                         /* Solaris 2.x gettimeofday */
 787                         set_personality(1);
 788                         break;
 789                 default:
 790                         /* Unknown syscall trap. */
 791                         if(tcp->flags & TCB_WAITEXECVE) {
 792                                 tcp->flags &= ~TCB_WAITEXECVE;
 793                                 return 0;
 794                         }
 795                         fprintf(stderr,"syscall: unknown syscall trap %08x %08x\n", trap, regs.r_pc);
 796                         return -1;
 797                 }
 798
 799                 /* Extract the system call number from the registers. */
 800                 if (trap == 0x91d02027)
 801                         scno = 156;
 802                 else
 803                         scno = regs.r_g1;
 804                 if (scno == 0) {
 805                         scno = regs.r_o0;
 806                         memmove (&regs.r_o0, &regs.r_o1, 7*sizeof(regs.r_o0));
 807                 }
 808         }
 809 #endif
 810 #endif /* LINUX */
 811 #ifdef SUNOS4
 812         if (upeek(pid, uoff(u_arg[7]), &scno) < 0)
 813                 return -1;
 814 #endif
 815 #ifdef USE_PROCFS
 816 #ifdef HAVE_PR_SYSCALL
 817         scno = tcp->status.PR_SYSCALL;
 818 #else /* !HAVE_PR_SYSCALL */
 819 #ifndef FREEBSD
 820         scno = tcp->status.PR_WHAT;
 821 #else /* FREEBSD */
 822         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
 823                 perror("pread");
 824                 return -1;
 825         }
 826         switch (regs.r_eax) {
 827         case SYS_syscall:
 828         case SYS___syscall:
 829                 pread(tcp->pfd, &scno, sizeof(scno), regs.r_esp + sizeof(int));
 830                 break;
 831         default:
 832                 scno = regs.r_eax;
 833                 break;
 834         }
 835 #endif /* FREEBSD */
 836 #endif /* !HAVE_PR_SYSCALL */
 837 #endif /* USE_PROCFS */
 838         if (!(tcp->flags & TCB_INSYSCALL))
 839                 tcp->scno = scno;
 840         return 1;
 841 }
 842
 843
 844 int
 845 syscall_fixup(tcp)
 846 struct tcb *tcp;
 847 {
 848 #ifndef USE_PROCFS
 849         int pid = tcp->pid;
 850 #else /* USE_PROCFS */
 851         int scno = tcp->scno;
 852
 853         if (!(tcp->flags & TCB_INSYSCALL)) {
 854                 if (tcp->status.PR_WHY != PR_SYSENTRY) {
 855                         if (
 856                             scno == SYS_fork
 857 #ifdef SYS_vfork
 858                             || scno == SYS_vfork
 859 #endif /* SYS_vfork */
 860                             ) {
 861                                 /* We are returning in the child, fake it. */
 862                                 tcp->status.PR_WHY = PR_SYSENTRY;
 863                                 trace_syscall(tcp);
 864                                 tcp->status.PR_WHY = PR_SYSEXIT;
 865                         }
 866                         else {
 867                                 fprintf(stderr, "syscall: missing entry\n");
 868                                 tcp->flags |= TCB_INSYSCALL;
 869                         }
 870                 }
 871         }
 872         else {
 873                 if (tcp->status.PR_WHY != PR_SYSEXIT) {
 874                         fprintf(stderr, "syscall: missing exit\n");
 875                         tcp->flags &= ~TCB_INSYSCALL;
 876                 }
 877         }
 878 #endif /* USE_PROCFS */
 879 #ifdef SUNOS4
 880         if (!(tcp->flags & TCB_INSYSCALL)) {
 881                 if (scno == 0) {
 882                         fprintf(stderr, "syscall: missing entry\n");
 883                         tcp->flags |= TCB_INSYSCALL;
 884                 }
 885         }
 886         else {
 887                 if (scno != 0) {
 888                         if (debug) {
 889                                 /*
 890                                  * This happens when a signal handler
 891                                  * for a signal which interrupted a
 892                                  * a system call makes another system call.
 893                                  */
 894                                 fprintf(stderr, "syscall: missing exit\n");
 895                         }
 896                         tcp->flags &= ~TCB_INSYSCALL;
 897                 }
 898         }
 899 #endif /* SUNOS4 */
 900 #ifdef LINUX
 901 #if defined (I386)
 902         if (upeek(pid, 4*EAX, &eax) < 0)
 903                 return -1;
 904         if (eax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 905                 if (debug)
 906                         fprintf(stderr, "stray syscall exit: eax = %ld\n", eax);
 907                 return 0;
 908         }
 909 #elif defined (S390)
 910         if (upeek(pid, PT_GPR2, &gpr2) < 0)
 911                 return -1;
 912         if (gpr2 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 913                 if (debug)
 914                         fprintf(stderr, "stray syscall exit: gpr2 = %ld\n", gpr2);
 915                 return 0;
 916         }
 917 #elif defined (POWERPC)
 918 # define SO_MASK 0x10000000
 919         if (upeek(pid, 4*PT_CCR, &flags) < 0)
 920                 return -1;
 921         if (upeek(pid, 4*PT_R3, &result) < 0)
 922                 return -1;
 923         if (flags & SO_MASK)
 924                 result = -result;
 925 #elif defined (M68K)
 926         if (upeek(pid, 4*PT_D0, &d0) < 0)
 927                 return -1;
 928         if (d0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 929                 if (debug)
 930                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", d0);
 931                 return 0;
 932         }
 933 #elif defined (ARM)
 934         if (upeek(pid, 4*0, (long *)&r0) < 0)
 935                 return -1;
 936         if ( 0 && r0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
 937                 if (debug)
 938                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", r0);
 939                 return 0;
 940         }
 941 #else
 942 #endif
 943 #endif /* LINUX */
 944         return 1;
 945 }
 946
 947 int
 948 get_error(tcp)
 949 struct tcb *tcp;
 950 {
 951         int u_error = 0;
 952 #ifdef LINUX
 953 #ifdef S390
 954                 if (gpr2 && (unsigned) -gpr2 < nerrnos) {
 955                         tcp->u_rval = -1;
 956                         u_error = -gpr2;
 957                 }
 958                 else {
 959                         tcp->u_rval = gpr2;
 960                         u_error = 0;
 961                 }
 962 #else /* !S390 */
 963 #ifdef I386
 964                 if (eax < 0 && -eax < nerrnos) {
 965                         tcp->u_rval = -1;
 966                         u_error = -eax;
 967                 }
 968                 else {
 969                         tcp->u_rval = eax;
 970                         u_error = 0;
 971                 }
 972 #else /* !I386 */
 973 #ifdef IA64
 974                 if (ia32) {
 975                         int err;
 976
 977                         err = (int)r8;
 978                         if (err < 0 && -err < nerrnos) {
 979                                 tcp->u_rval = -1;
 980                                 u_error = -err;
 981                         }
 982                         else {
 983                                 tcp->u_rval = err;
 984                                 u_error = 0;
 985                         }
 986                 } else {
 987                         if (r10) {
 988                                 tcp->u_rval = -1;
 989                                 u_error = r8;
 990                         } else {
 991                                 tcp->u_rval = r8;
 992                                 u_error = 0;
 993                         }
 994                 }
 995 #else /* !IA64 */
 996 #ifdef MIPS
 997                 if (a3) {
 998                         tcp->u_rval = -1;
 999                         u_error = r2;
1000                 } else {
1001                         tcp->u_rval = r2;
1002                         u_error = 0;
1003                 }
1004 #else
1005 #ifdef POWERPC
1006                 if (result && (unsigned) -result < nerrnos) {
1007                         tcp->u_rval = -1;
1008                         u_error = -result;
1009                 }
1010                 else {
1011                         tcp->u_rval = result;
1012                         u_error = 0;
1013                 }
1014 #else /* !POWERPC */
1015 #ifdef M68K
1016                 if (d0 && (unsigned) -d0 < nerrnos) {
1017                         tcp->u_rval = -1;
1018                         u_error = -d0;
1019                 }
1020                 else {
1021                         tcp->u_rval = d0;
1022                         u_error = 0;
1023                 }
1024 #else /* !M68K */
1025 #ifdef ARM
1026                 if (r0 && (unsigned) -r0 < nerrnos) {
1027                         tcp->u_rval = -1;
1028                         u_error = -r0;
1029                 }
1030                 else {
1031                         tcp->u_rval = r0;
1032                         u_error = 0;
1033                 }
1034 #else /* !ARM */
1035 #ifdef ALPHA
1036                 if (a3) {
1037                         tcp->u_rval = -1;
1038                         u_error = r0;
1039                 }
1040                 else {
1041                         tcp->u_rval = r0;
1042                         u_error = 0;
1043                 }
1044 #else /* !ALPHA */
1045 #ifdef SPARC
1046                 if (regs.r_psr & PSR_C) {
1047                         tcp->u_rval = -1;
1048                         u_error = regs.r_o0;
1049                 }
1050                 else {
1051                         tcp->u_rval = regs.r_o0;
1052                         u_error = 0;
1053                 }
1054 #endif /* SPARC */
1055 #endif /* ALPHA */
1056 #endif /* ARM */
1057 #endif /* M68K */
1058 #endif /* POWERPC */
1059 #endif /* MIPS */
1060 #endif /* IA64 */
1061 #endif /* I386 */
1062 #endif /* S390 */
1063 #endif /* LINUX */
1064 #ifdef SUNOS4
1065                 /* get error code from user struct */
1066                 if (upeek(pid, uoff(u_error), &u_error) < 0)
1067                         return -1;
1068                 u_error >>= 24; /* u_error is a char */
1069
1070                 /* get system call return value */
1071                 if (upeek(pid, uoff(u_rval1), &tcp->u_rval) < 0)
1072                         return -1;
1073 #endif /* SUNOS4 */
1074 #ifdef SVR4
1075 #ifdef SPARC
1076                 /* Judicious guessing goes a long way. */
1077                 if (tcp->status.pr_reg[R_PSR] & 0x100000) {
1078                         tcp->u_rval = -1;
1079                         u_error = tcp->status.pr_reg[R_O0];
1080                 }
1081                 else {
1082                         tcp->u_rval = tcp->status.pr_reg[R_O0];
1083                         u_error = 0;
1084                 }
1085 #endif /* SPARC */
1086 #ifdef I386
1087                 /* Wanna know how to kill an hour single-stepping? */
1088                 if (tcp->status.PR_REG[EFL] & 0x1) {
1089                         tcp->u_rval = -1;
1090                         u_error = tcp->status.PR_REG[EAX];
1091                 }
1092                 else {
1093                         tcp->u_rval = tcp->status.PR_REG[EAX];
1094 #ifdef HAVE_LONG_LONG
1095                         tcp->u_lrval =
1096                                 ((unsigned long long) tcp->status.PR_REG[EDX] << 32) +
1097                                 tcp->status.PR_REG[EAX];
1098 #endif
1099                         u_error = 0;
1100                 }
1101 #endif /* I386 */
1102 #ifdef MIPS
1103                 if (tcp->status.pr_reg[CTX_A3]) {
1104                         tcp->u_rval = -1;
1105                         u_error = tcp->status.pr_reg[CTX_V0];
1106                 }
1107                 else {
1108                         tcp->u_rval = tcp->status.pr_reg[CTX_V0];
1109                         u_error = 0;
1110                 }
1111 #endif /* MIPS */
1112 #endif /* SVR4 */
1113 #ifdef FREEBSD
1114                 if (regs.r_eflags & PSL_C) {
1115                         tcp->u_rval = -1;
1116                         u_error = regs.r_eax;
1117                 } else {
1118                         tcp->u_rval = regs.r_eax;
1119                         tcp->u_lrval =
1120                           ((unsigned long long) regs.r_edx << 32) +  regs.r_eax;
1121                         u_error = 0;
1122                 }
1123 #endif /* FREEBSD */
1124         tcp->u_error = u_error;
1125         return 1;
1126 }
1127
1128 int syscall_enter(tcp)
1129 struct tcb *tcp;
1130 {
1131 #ifndef USE_PROCFS
1132         int pid = tcp->pid;
1133 #endif /* !USE_PROCFS */
1134 #ifdef LINUX
1135 #if defined(S390)
1136         {
1137                 int i;
1138                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1139                         tcp->u_nargs = sysent[tcp->scno].nargs;
1140                 else
1141                         tcp->u_nargs = MAX_ARGS;
1142                 for (i = 0; i < tcp->u_nargs; i++) {
1143                         if (upeek(pid,i==0 ? PT_ORIGGPR2:PT_GPR2+(i<<2), &tcp->u_arg[i]) < 0)
1144                                 return -1;
1145                 }
1146         }
1147 #elif defined (ALPHA)
1148         {
1149                 int i;
1150                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1151                         tcp->u_nargs = sysent[tcp->scno].nargs;
1152                 else
1153                         tcp->u_nargs = MAX_ARGS;
1154                 for (i = 0; i < tcp->u_nargs; i++) {
1155                         /* WTA: if scno is out-of-bounds this will bomb. Add range-check
1156                          * for scno somewhere above here!
1157                          */
1158                         if (upeek(pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1159                                 return -1;
1160                 }
1161         }
1162 #elif defined (IA64)
1163         {
1164                 unsigned long *bsp, cfm, i;
1165
1166                 if (upeek(pid, PT_AR_BSP, (long *) &bsp) < 0)
1167                         return -1;
1168                 if (upeek(pid, PT_CFM, (long *) &cfm) < 0)
1169                         return -1;
1170
1171                 bsp = ia64_rse_skip_regs(bsp, -(cfm & 0x7f));
1172
1173                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1174                         tcp->u_nargs = sysent[tcp->scno].nargs;
1175                 else
1176                         tcp->u_nargs = MAX_ARGS;
1177                 for (i = 0; i < tcp->u_nargs; ++i) {
1178                         if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(bsp, i), sizeof(long),
1179                                    (char *) &tcp->u_arg[i])
1180                             < 0)
1181                                 return -1;
1182                 }
1183         }
1184 #elif defined (MIPS)
1185         {
1186                 long sp;
1187                 int i, nargs;
1188
1189                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1190                         nargs = tcp->u_nargs = sysent[tcp->scno].nargs;
1191                 else
1192                         nargs = tcp->u_nargs = MAX_ARGS;
1193                 if(nargs > 4) {
1194                         if(upeek(pid, REG_SP, &sp) < 0)
1195                                 return -1;
1196                         for(i = 0; i < 4; i++) {
1197                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i])<0)
1198                                         return -1;
1199                         }
1200                         umoven(tcp, sp+16, (nargs-4) * sizeof(tcp->u_arg[0]),
1201                                (char *)(tcp->u_arg + 4));
1202                 } else {
1203                         for(i = 0; i < nargs; i++) {
1204                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1205                                         return -1;
1206                         }
1207                 }
1208         }
1209 #elif defined (POWERPC)
1210         {
1211                 int i;
1212                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1213                         tcp->u_nargs = sysent[tcp->scno].nargs;
1214                 else
1215                         tcp->u_nargs = MAX_ARGS;
1216                 for (i = 0; i < tcp->u_nargs; i++) {
1217                         if (upeek(pid, (i==0) ? (4*PT_ORIG_R3) : ((i+PT_R3)*4), &tcp->u_arg[i]) < 0)
1218                                 return -1;
1219                 }
1220         }
1221 #elif defined (SPARC)
1222         {
1223                 int i;
1224
1225                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1226                         tcp->u_nargs = sysent[tcp->scno].nargs;
1227                 else
1228                         tcp->u_nargs = MAX_ARGS;
1229                 for (i = 0; i < tcp->u_nargs; i++)
1230                         tcp->u_arg[i] = *((&regs.r_o0) + i);
1231         }
1232 #else /* Other architecture (like i386) (32bits specific) */
1233         {
1234                 int i;
1235                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1236                         tcp->u_nargs = sysent[tcp->scno].nargs;
1237                 else
1238                         tcp->u_nargs = MAX_ARGS;
1239                 for (i = 0; i < tcp->u_nargs; i++) {
1240                         if (upeek(pid, i*4, &tcp->u_arg[i]) < 0)
1241                                 return -1;
1242                 }
1243         }
1244 #endif
1245 #endif /* LINUX */
1246 #ifdef SUNOS4
1247         {
1248                 int i;
1249                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1250                         tcp->u_nargs = sysent[tcp->scno].nargs;
1251                 else
1252                         tcp->u_nargs = MAX_ARGS;
1253                 for (i = 0; i < tcp->u_nargs; i++) {
1254                         struct user *u;
1255
1256                         if (upeek(pid, uoff(u_arg[0]) +
1257                             (i*sizeof(u->u_arg[0])), &tcp->u_arg[i]) < 0)
1258                                 return -1;
1259                 }
1260         }
1261 #endif /* SUNOS4 */
1262 #ifdef SVR4
1263 #ifdef MIPS
1264         /*
1265          * SGI is broken: even though it has pr_sysarg, it doesn't
1266          * set them on system call entry.  Get a clue.
1267          */
1268         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1269                 tcp->u_nargs = sysent[tcp->scno].nargs;
1270         else
1271                 tcp->u_nargs = tcp->status.pr_nsysarg;
1272         if (tcp->u_nargs > 4) {
1273                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1274                         4*sizeof(tcp->u_arg[0]));
1275                 umoven(tcp, tcp->status.pr_reg[CTX_SP] + 16,
1276                         (tcp->u_nargs - 4)*sizeof(tcp->u_arg[0]), (char *) (tcp->u_arg + 4));
1277         }
1278         else {
1279                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
1280                         tcp->u_nargs*sizeof(tcp->u_arg[0]));
1281         }
1282 #elif UNIXWARE >= 2
1283         /*
1284          * Like SGI, UnixWare doesn't set pr_sysarg until system call exit
1285          */
1286         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1287                 tcp->u_nargs = sysent[tcp->scno].nargs;
1288         else
1289                 tcp->u_nargs = tcp->status.pr_lwp.pr_nsysarg;
1290         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
1291                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
1292 #elif defined (HAVE_PR_SYSCALL)
1293         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1294                 tcp->u_nargs = sysent[tcp->scno].nargs;
1295         else
1296                 tcp->u_nargs = tcp->status.pr_nsysarg;
1297         {
1298                 int i;
1299                 for (i = 0; i < tcp->u_nargs; i++)
1300                         tcp->u_arg[i] = tcp->status.pr_sysarg[i];
1301         }
1302 #elif defined (I386)
1303         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1304                 tcp->u_nargs = sysent[tcp->scno].nargs;
1305         else
1306                 tcp->u_nargs = 5;
1307         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
1308                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
1309 #else
1310         I DONT KNOW WHAT TO DO
1311 #endif /* !HAVE_PR_SYSCALL */
1312 #endif /* SVR4 */
1313 #ifdef FREEBSD
1314         if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
1315             sysent[tcp->scno].nargs > tcp->status.val)
1316                 tcp->u_nargs = sysent[tcp->scno].nargs;
1317         else
1318                 tcp->u_nargs = tcp->status.val;
1319         if (tcp->u_nargs < 0)
1320                 tcp->u_nargs = 0;
1321         if (tcp->u_nargs > MAX_ARGS)
1322                 tcp->u_nargs = MAX_ARGS;
1323         switch(regs.r_eax) {
1324         case SYS___syscall:
1325                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1326                       regs.r_esp + sizeof(int) + sizeof(quad_t));
1327           break;
1328         case SYS_syscall:
1329                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1330                       regs.r_esp + 2 * sizeof(int));
1331           break;
1332         default:
1333                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
1334                       regs.r_esp + sizeof(int));
1335           break;
1336         }
1337 #endif /* FREEBSD */
1338         return 1;
1339 }
1340
1341 int
1342 trace_syscall(tcp)
1343 struct tcb *tcp;
1344 {
1345         int sys_res;
1346         struct timeval tv;
1347         int res;
1348
1349         /* Measure the exit time as early as possible to avoid errors. */
1350         if (dtime && (tcp->flags & TCB_INSYSCALL))
1351                 gettimeofday(&tv, NULL);
1352
1353         res = get_scno(tcp);
1354         if (res != 1)
1355                 return res;
1356
1357         res = syscall_fixup(tcp);
1358         if (res != 1)
1359                 return res;
1360
1361         if (tcp->flags & TCB_INSYSCALL) {
1362                 long u_error;
1363                 res = get_error(tcp);
1364                 if (res != 1)
1365                         return res;
1366                 u_error = tcp->u_error;
1367
1368
1369                 internal_syscall(tcp);
1370                 if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
1371                     !(qual_flags[tcp->scno] & QUAL_TRACE)) {
1372                         tcp->flags &= ~TCB_INSYSCALL;
1373                         return 0;
1374                 }
1375
1376                 if (tcp->flags & TCB_REPRINT) {
1377                         printleader(tcp);
1378                         tprintf("<... ");
1379                         if (tcp->scno >= nsyscalls || tcp->scno < 0)
1380                                 tprintf("syscall_%lu", tcp->scno);
1381                         else
1382                                 tprintf("%s", sysent[tcp->scno].sys_name);
1383                         tprintf(" resumed> ");
1384                 }
1385
1386                 if (cflag && tcp->scno < nsyscalls && tcp->scno >= 0) {
1387                         call_count[tcp->scno]++;
1388                         if (tcp->u_error)
1389                                 error_count[tcp->scno]++;
1390                         tv_sub(&tv, &tv, &tcp->etime);
1391 #ifdef LINUX
1392                         if (tv_cmp(&tv, &tcp->dtime) > 0) {
1393                                 static struct timeval one_tick =
1394                                         { 0, 1000000 / HZ };
1395
1396                                 if (tv_nz(&tcp->dtime))
1397                                         tv = tcp->dtime;
1398                                 else if (tv_cmp(&tv, &one_tick) > 0) {
1399                                         if (tv_cmp(&shortest, &one_tick) < 0)
1400                                                 tv = shortest;
1401                                         else
1402                                                 tv = one_tick;
1403                                 }
1404                         }
1405 #endif /* LINUX */
1406                         if (tv_cmp(&tv, &shortest) < 0)
1407                                 shortest = tv;
1408                         tv_add(&tv_count[tcp->scno],
1409                                 &tv_count[tcp->scno], &tv);
1410                         tcp->flags &= ~TCB_INSYSCALL;
1411                         return 0;
1412                 }
1413
1414                 if (tcp->scno >= nsyscalls || tcp->scno < 0
1415                     || (qual_flags[tcp->scno] & QUAL_RAW))
1416                         sys_res = printargs(tcp);
1417                 else
1418                         sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1419                 u_error = tcp->u_error;
1420                 tprintf(") ");
1421                 tabto(acolumn);
1422                 if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
1423                     qual_flags[tcp->scno] & QUAL_RAW) {
1424                         if (u_error)
1425                                 tprintf("= -1 (errno %ld)", u_error);
1426                         else
1427                                 tprintf("= %#lx", tcp->u_rval);
1428                 }
1429                 else if (!(sys_res & RVAL_NONE) && u_error) {
1430                         switch (u_error) {
1431 #ifdef LINUX
1432                         case ERESTARTSYS:
1433                                 tprintf("= ? ERESTARTSYS (To be restarted)");
1434                                 break;
1435                         case ERESTARTNOINTR:
1436                                 tprintf("= ? ERESTARTNOINTR (To be restarted)");
1437                                 break;
1438                         case ERESTARTNOHAND:
1439                                 tprintf("= ? ERESTARTNOHAND (To be restarted)");
1440                                 break;
1441 #endif /* LINUX */
1442                         default:
1443                                 tprintf("= -1 ");
1444                                 if (u_error < nerrnos && u_error < sys_nerr)
1445                                         tprintf("%s (%s)", errnoent[u_error],
1446                                                 sys_errlist[u_error]);
1447                                 else if (u_error < nerrnos)
1448                                         tprintf("%s (errno %ld)",
1449                                                 errnoent[u_error], u_error);
1450                                 else if (u_error < sys_nerr)
1451                                         tprintf("ERRNO_%ld (%s)", u_error,
1452                                                 sys_errlist[u_error]);
1453                                 else
1454                                         tprintf("E??? (errno %ld)", u_error);
1455                                 break;
1456                         }
1457                 }
1458                 else {
1459                         if (sys_res & RVAL_NONE)
1460                                 tprintf("= ?");
1461                         else {
1462                                 switch (sys_res & RVAL_MASK) {
1463                                 case RVAL_HEX:
1464                                         tprintf("= %#lx", tcp->u_rval);
1465                                         break;
1466                                 case RVAL_OCTAL:
1467                                         tprintf("= %#lo", tcp->u_rval);
1468                                         break;
1469                                 case RVAL_UDECIMAL:
1470                                         tprintf("= %lu", tcp->u_rval);
1471                                         break;
1472                                 case RVAL_DECIMAL:
1473                                         tprintf("= %ld", tcp->u_rval);
1474                                         break;
1475 #ifdef HAVE_LONG_LONG
1476                                 case RVAL_LHEX:
1477                                         tprintf("= %#llx", tcp->u_lrval);
1478                                         break;
1479                                 case RVAL_LOCTAL:
1480                                         tprintf("= %#llo", tcp->u_lrval);
1481                                         break;
1482                                 case RVAL_LUDECIMAL:
1483                                         tprintf("= %llu", tcp->u_lrval);
1484                                         break;
1485                                 case RVAL_LDECIMAL:
1486                                         tprintf("= %lld", tcp->u_lrval);
1487                                         break;
1488 #endif
1489                                 default:
1490                                         fprintf(stderr,
1491                                                 "invalid rval format\n");
1492                                         break;
1493                                 }
1494                         }
1495                         if ((sys_res & RVAL_STR) && tcp->auxstr)
1496                                 tprintf(" (%s)", tcp->auxstr);
1497                 }
1498                 if (dtime) {
1499                         tv_sub(&tv, &tv, &tcp->etime);
1500                         tprintf(" <%ld.%06ld>",
1501                                 (long) tv.tv_sec, (long) tv.tv_usec);
1502                 }
1503                 printtrailer(tcp);
1504
1505                 dumpio(tcp);
1506                 if (fflush(tcp->outf) == EOF)
1507                         return -1;
1508                 tcp->flags &= ~TCB_INSYSCALL;
1509                 return 0;
1510         }
1511
1512         /* Entering system call */
1513         res = syscall_enter(tcp);
1514         if (res != 1)
1515                 return res;
1516
1517         switch (tcp->scno + NR_SYSCALL_BASE) {
1518 #ifdef LINUX
1519 #if !defined (ALPHA) && !defined(IA64) && !defined(SPARC) && !defined(MIPS)
1520         case SYS_socketcall:
1521                 decode_subcall(tcp, SYS_socket_subcall,
1522                         SYS_socket_nsubcalls, deref_style);
1523                 break;
1524         case SYS_ipc:
1525                 decode_subcall(tcp, SYS_ipc_subcall,
1526                         SYS_ipc_nsubcalls, shift_style);
1527                 break;
1528 #endif /* !ALPHA && !IA64 && !MIPS && !SPARC */
1529 #ifdef SPARC
1530         case SYS_socketcall:
1531                 sparc_socket_decode (tcp);
1532                 break;
1533 #endif
1534 #endif /* LINUX */
1535 #ifdef SVR4
1536 #ifdef SYS_pgrpsys_subcall
1537         case SYS_pgrpsys:
1538                 decode_subcall(tcp, SYS_pgrpsys_subcall,
1539                         SYS_pgrpsys_nsubcalls, shift_style);
1540                 break;
1541 #endif /* SYS_pgrpsys_subcall */
1542 #ifdef SYS_sigcall_subcall
1543         case SYS_sigcall:
1544                 decode_subcall(tcp, SYS_sigcall_subcall,
1545                         SYS_sigcall_nsubcalls, mask_style);
1546                 break;
1547 #endif /* SYS_sigcall_subcall */
1548         case SYS_msgsys:
1549                 decode_subcall(tcp, SYS_msgsys_subcall,
1550                         SYS_msgsys_nsubcalls, shift_style);
1551                 break;
1552         case SYS_shmsys:
1553                 decode_subcall(tcp, SYS_shmsys_subcall,
1554                         SYS_shmsys_nsubcalls, shift_style);
1555                 break;
1556         case SYS_semsys:
1557                 decode_subcall(tcp, SYS_semsys_subcall,
1558                         SYS_semsys_nsubcalls, shift_style);
1559                 break;
1560 #if 0 /* broken */
1561         case SYS_utssys:
1562                 decode_subcall(tcp, SYS_utssys_subcall,
1563                         SYS_utssys_nsubcalls, shift_style);
1564                 break;
1565 #endif
1566         case SYS_sysfs:
1567                 decode_subcall(tcp, SYS_sysfs_subcall,
1568                         SYS_sysfs_nsubcalls, shift_style);
1569                 break;
1570         case SYS_spcall:
1571                 decode_subcall(tcp, SYS_spcall_subcall,
1572                         SYS_spcall_nsubcalls, shift_style);
1573                 break;
1574 #ifdef SYS_context_subcall
1575         case SYS_context:
1576                 decode_subcall(tcp, SYS_context_subcall,
1577                         SYS_context_nsubcalls, shift_style);
1578                 break;
1579 #endif /* SYS_context_subcall */
1580 #ifdef SYS_door_subcall
1581         case SYS_door:
1582                 decode_subcall(tcp, SYS_door_subcall,
1583                         SYS_door_nsubcalls, door_style);
1584                 break;
1585 #endif /* SYS_door_subcall */
1586 #ifdef SYS_kaio_subcall
1587         case SYS_kaio:
1588                 decode_subcall(tcp, SYS_kaio_subcall,
1589                         SYS_kaio_nsubcalls, shift_style);
1590                 break;
1591 #endif
1592 #endif /* SVR4 */
1593 #ifdef FREEBSD
1594         case SYS_msgsys:
1595         case SYS_shmsys:
1596         case SYS_semsys:
1597                 decode_subcall(tcp, 0, 0, table_style);
1598                 break;
1599 #endif
1600 #ifdef SUNOS4
1601         case SYS_semsys:
1602                 decode_subcall(tcp, SYS_semsys_subcall,
1603                         SYS_semsys_nsubcalls, shift_style);
1604                 break;
1605         case SYS_msgsys:
1606                 decode_subcall(tcp, SYS_msgsys_subcall,
1607                         SYS_msgsys_nsubcalls, shift_style);
1608                 break;
1609         case SYS_shmsys:
1610                 decode_subcall(tcp, SYS_shmsys_subcall,
1611                         SYS_shmsys_nsubcalls, shift_style);
1612                 break;
1613 #endif
1614         }
1615
1616         internal_syscall(tcp);
1617         if (tcp->scno >=0 && tcp->scno < nsyscalls && !(qual_flags[tcp->scno] & QUAL_TRACE)) {
1618                 tcp->flags |= TCB_INSYSCALL;
1619                 return 0;
1620         }
1621
1622         if (cflag) {
1623                 gettimeofday(&tcp->etime, NULL);
1624                 tcp->flags |= TCB_INSYSCALL;
1625                 return 0;
1626         }
1627
1628         printleader(tcp);
1629         tcp->flags &= ~TCB_REPRINT;
1630         tcp_last = tcp;
1631         if (tcp->scno >= nsyscalls || tcp->scno < 0)
1632                 tprintf("syscall_%lu(", tcp->scno);
1633         else
1634                 tprintf("%s(", sysent[tcp->scno].sys_name);
1635         if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
1636             ((qual_flags[tcp->scno] & QUAL_RAW) && tcp->scno != SYS_exit))
1637                 sys_res = printargs(tcp);
1638         else
1639                 sys_res = (*sysent[tcp->scno].sys_func)(tcp);
1640         if (fflush(tcp->outf) == EOF)
1641                 return -1;
1642         tcp->flags |= TCB_INSYSCALL;
1643         /* Measure the entrance time as late as possible to avoid errors. */
1644         if (dtime)
1645                 gettimeofday(&tcp->etime, NULL);
1646         return sys_res;
1647 }
1648
1649 int
1650 printargs(tcp)
1651 struct tcb *tcp;
1652 {
1653         if (entering(tcp)) {
1654                 int i;
1655
1656                 for (i = 0; i < tcp->u_nargs; i++)
1657                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
1658         }
1659         return 0;
1660 }
1661
1662 long
1663 getrval2(tcp)
1664 struct tcb *tcp;
1665 {
1666         long val = -1;
1667
1668 #ifdef LINUX
1669 #ifdef SPARC
1670         struct regs regs;
1671         if (ptrace(PTRACE_GETREGS,tcp->pid,(char *)&regs,0) < 0)
1672                 return -1;
1673         val = regs.r_o1;
1674 #endif /* SPARC */
1675 #endif /* LINUX */
1676
1677 #ifdef SUNOS4
1678         if (upeek(tcp->pid, uoff(u_rval2), &val) < 0)
1679                 return -1;
1680 #endif /* SUNOS4 */
1681
1682 #ifdef SVR4
1683 #ifdef SPARC
1684         val = tcp->status.PR_REG[R_O1];
1685 #endif /* SPARC */
1686 #ifdef I386
1687         val = tcp->status.PR_REG[EDX];
1688 #endif /* I386 */
1689 #ifdef MIPS
1690         val = tcp->status.PR_REG[CTX_V1];
1691 #endif /* MIPS */
1692 #endif /* SVR4 */
1693 #ifdef FREEBSD
1694         struct reg regs;
1695         pread(tcp->pfd_reg, &regs, sizeof(regs), 0);
1696         val = regs.r_edx;
1697 #endif
1698         return val;
1699 }
1700
1701 /*
1702  * Apparently, indirect system calls have already be converted by ptrace(2),
1703  * so if you see "indir" this program has gone astray.
1704  */
1705 int
1706 sys_indir(tcp)
1707 struct tcb *tcp;
1708 {
1709         int i, scno, nargs;
1710
1711         if (entering(tcp)) {
1712                 if ((scno = tcp->u_arg[0]) > nsyscalls) {
1713                         fprintf(stderr, "Bogus syscall: %u\n", scno);
1714                         return 0;
1715                 }
1716                 nargs = sysent[scno].nargs;
1717                 tprintf("%s", sysent[scno].sys_name);
1718                 for (i = 0; i < nargs; i++)
1719                         tprintf(", %#lx", tcp->u_arg[i+1]);
1720         }
1721         return 0;
1722 }
1723
1724 static int
1725 time_cmp(a, b)
1726 void *a;
1727 void *b;
1728 {
1729         return -tv_cmp(&tv_count[*((int *) a)], &tv_count[*((int *) b)]);
1730 }
1731
1732 static int
1733 syscall_cmp(a, b)
1734 void *a;
1735 void *b;
1736 {
1737         return strcmp(sysent[*((int *) a)].sys_name,
1738                 sysent[*((int *) b)].sys_name);
1739 }
1740
1741 static int
1742 count_cmp(a, b)
1743 void *a;
1744 void *b;
1745 {
1746         int m = call_count[*((int *) a)], n = call_count[*((int *) b)];
1747
1748         return (m < n) ? 1 : (m > n) ? -1 : 0;
1749 }
1750
1751 static int (*sortfun)();
1752 static struct timeval overhead = { -1, -1 };
1753
1754 void
1755 set_sortby(sortby)
1756 char *sortby;
1757 {
1758         if (strcmp(sortby, "time") == 0)
1759                 sortfun = time_cmp;
1760         else if (strcmp(sortby, "calls") == 0)
1761                 sortfun = count_cmp;
1762         else if (strcmp(sortby, "name") == 0)
1763                 sortfun = syscall_cmp;
1764         else if (strcmp(sortby, "nothing") == 0)
1765                 sortfun = NULL;
1766         else {
1767                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
1768                 exit(1);
1769         }
1770 }
1771
1772 void set_overhead(n)
1773 int n;
1774 {
1775         overhead.tv_sec = n / 1000000;
1776         overhead.tv_usec = n % 1000000;
1777 }
1778
1779 void
1780 call_summary(outf)
1781 FILE *outf;
1782 {
1783         int i, j;
1784         int call_cum, error_cum;
1785         struct timeval tv_cum, dtv;
1786         double percent;
1787         char *dashes = "-------------------------";
1788         char error_str[16];
1789
1790         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
1791         if (overhead.tv_sec == -1) {
1792                 tv_mul(&overhead, &shortest, 8);
1793                 tv_div(&overhead, &overhead, 10);
1794         }
1795         for (i = 0; i < nsyscalls; i++) {
1796                 sorted_count[i] = i;
1797                 if (call_count[i] == 0)
1798                         continue;
1799                 tv_mul(&dtv, &overhead, call_count[i]);
1800                 tv_sub(&tv_count[i], &tv_count[i], &dtv);
1801                 call_cum += call_count[i];
1802                 error_cum += error_count[i];
1803                 tv_add(&tv_cum, &tv_cum, &tv_count[i]);
1804         }
1805         if (sortfun)
1806                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
1807         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
1808                 "% time", "seconds", "usecs/call",
1809                 "calls", "errors", "syscall");
1810         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
1811                 dashes, dashes, dashes, dashes, dashes, dashes);
1812         for (i = 0; i < nsyscalls; i++) {
1813                 j = sorted_count[i];
1814                 if (call_count[j] == 0)
1815                         continue;
1816                 tv_div(&dtv, &tv_count[j], call_count[j]);
1817                 if (error_count[j])
1818                         sprintf(error_str, "%d", error_count[j]);
1819                 else
1820                         error_str[0] = '\0';
1821                 percent = 100.0*tv_float(&tv_count[j])/tv_float(&tv_cum);
1822                 fprintf(outf, "%6.2f %4ld.%06ld %11ld %9d %9.9s %s\n",
1823                         percent, (long) tv_count[j].tv_sec,
1824                         (long) tv_count[j].tv_usec,
1825                         (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
1826                         call_count[j], error_str, sysent[j].sys_name);
1827         }
1828         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
1829                 dashes, dashes, dashes, dashes, dashes, dashes);
1830         if (error_cum)
1831                 sprintf(error_str, "%d", error_cum);
1832         else
1833                 error_str[0] = '\0';
1834         fprintf(outf, "%6.6s %4ld.%06ld %11.11s %9d %9.9s %s\n",
1835                 "100.00", (long) tv_cum.tv_sec, (long) tv_cum.tv_usec, "",
1836                 call_cum, error_str, "total");
1837 }