granicus.if.org Git - strace/blob - syscall.c

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *      $Id$
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <signal.h>
  39 #include <time.h>
  40 #include <errno.h>
  41 #include <sys/user.h>
  42 #include <sys/syscall.h>
  43 #include <sys/param.h>
  44
  45 #if HAVE_ASM_REG_H
  46 #ifdef SPARC
  47 #  define fpq kernel_fpq
  48 #  define fq kernel_fq
  49 #  define fpu kernel_fpu
  50 #endif
  51 #include <asm/reg.h>
  52 #ifdef SPARC
  53 #  undef fpq
  54 #  undef fq
  55 #  undef fpu
  56 #endif
  57 #endif
  58
  59 #ifdef HAVE_SYS_REG_H
  60 #include <sys/reg.h>
  61 #ifndef PTRACE_PEEKUSR
  62 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  63 #endif
  64 #elif defined(HAVE_LINUX_PTRACE_H)
  65 #undef PTRACE_SYSCALL
  66 #include <linux/ptrace.h>
  67 #endif
  68
  69 #if defined(LINUX) && defined(IA64)
  70 # include <asm/ptrace_offsets.h>
  71 # include <asm/rse.h>
  72 #endif
  73
  74 #define NR_SYSCALL_BASE 0
  75 #ifdef LINUX
  76 #ifndef ERESTARTSYS
  77 #define ERESTARTSYS     512
  78 #endif
  79 #ifndef ERESTARTNOINTR
  80 #define ERESTARTNOINTR  513
  81 #endif
  82 #ifndef ERESTARTNOHAND
  83 #define ERESTARTNOHAND  514     /* restart if no handler.. */
  84 #endif
  85 #ifndef ENOIOCTLCMD
  86 #define ENOIOCTLCMD     515     /* No ioctl command */
  87 #endif
  88 #ifndef NSIG
  89 #define NSIG 32
  90 #endif
  91 #ifdef ARM
  92 #undef NSIG
  93 #define NSIG 32
  94 #undef NR_SYSCALL_BASE
  95 #define NR_SYSCALL_BASE __NR_SYSCALL_BASE
  96 #endif
  97 #endif /* LINUX */
  98
  99 #include "syscall.h"
 100
 101 /* Define these shorthand notations to simplify the syscallent files. */
 102 #define TF TRACE_FILE
 103 #define TI TRACE_IPC
 104 #define TN TRACE_NETWORK
 105 #define TP TRACE_PROCESS
 106 #define TS TRACE_SIGNAL
 107
 108 struct sysent sysent0[] = {
 109 #include "syscallent.h"
 110 };
 111 int nsyscalls0 = sizeof sysent0 / sizeof sysent0[0];
 112
 113 #if SUPPORTED_PERSONALITIES >= 2
 114 struct sysent sysent1[] = {
 115 #include "syscallent1.h"
 116 };
 117 int nsyscalls1 = sizeof sysent1 / sizeof sysent1[0];
 118 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 119
 120 #if SUPPORTED_PERSONALITIES >= 3
 121 struct sysent sysent2[] = {
 122 #include "syscallent2.h"
 123 };
 124 int nsyscalls2 = sizeof sysent2 / sizeof sysent2[0];
 125 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 126
 127 struct sysent *sysent;
 128 int nsyscalls;
 129
 130 /* Now undef them since short defines cause wicked namespace pollution. */
 131 #undef TF
 132 #undef TI
 133 #undef TN
 134 #undef TP
 135 #undef TS
 136
 137 char *errnoent0[] = {
 138 #include "errnoent.h"
 139 };
 140 int nerrnos0 = sizeof errnoent0 / sizeof errnoent0[0];
 141
 142 #if SUPPORTED_PERSONALITIES >= 2
 143 char *errnoent1[] = {
 144 #include "errnoent1.h"
 145 };
 146 int nerrnos1 = sizeof errnoent1 / sizeof errnoent1[0];
 147 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 148
 149 #if SUPPORTED_PERSONALITIES >= 3
 150 char *errnoent2[] = {
 151 #include "errnoent2.h"
 152 };
 153 int nerrnos2 = sizeof errnoent2 / sizeof errnoent2[0];
 154 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 155
 156 char **errnoent;
 157 int nerrnos;
 158
 159 int current_personality;
 160
 161 int
 162 set_personality(personality)
 163 int personality;
 164 {
 165         switch (personality) {
 166         case 0:
 167                 errnoent = errnoent0;
 168                 nerrnos = nerrnos0;
 169                 sysent = sysent0;
 170                 nsyscalls = nsyscalls0;
 171                 ioctlent = ioctlent0;
 172                 nioctlents = nioctlents0;
 173                 signalent = signalent0;
 174                 nsignals = nsignals0;
 175                 break;
 176
 177 #if SUPPORTED_PERSONALITIES >= 2
 178         case 1:
 179                 errnoent = errnoent1;
 180                 nerrnos = nerrnos1;
 181                 sysent = sysent1;
 182                 nsyscalls = nsyscalls1;
 183                 ioctlent = ioctlent1;
 184                 nioctlents = nioctlents1;
 185                 signalent = signalent1;
 186                 nsignals = nsignals1;
 187                 break;
 188 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 189
 190 #if SUPPORTED_PERSONALITIES >= 3
 191         case 2:
 192                 errnoent = errnoent2;
 193                 nerrnos = nerrnos2;
 194                 sysent = sysent2;
 195                 nsyscalls = nsyscalls2;
 196                 ioctlent = ioctlent2;
 197                 nioctlents = nioctlents2;
 198                 signalent = signalent2;
 199                 nsignals = nsignals2;
 200                 break;
 201 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 202
 203         default:
 204                 return -1;
 205         }
 206
 207         current_personality = personality;
 208         return 0;
 209 }
 210
 211 int qual_flags[MAX_QUALS];
 212
 213 static int call_count[MAX_QUALS];
 214 static int error_count[MAX_QUALS];
 215 static struct timeval tv_count[MAX_QUALS];
 216 static int sorted_count[MAX_QUALS];
 217
 218 static struct timeval shortest = { 1000000, 0 };
 219
 220 static int qual_syscall(), qual_signal(), qual_fault(), qual_desc();
 221
 222 static struct qual_options {
 223         int bitflag;
 224         char *option_name;
 225         int (*qualify)();
 226         char *argument_name;
 227 } qual_options[] = {
 228         { QUAL_TRACE,   "trace",        qual_syscall,   "system call"   },
 229         { QUAL_TRACE,   "t",            qual_syscall,   "system call"   },
 230         { QUAL_ABBREV,  "abbrev",       qual_syscall,   "system call"   },
 231         { QUAL_ABBREV,  "a",            qual_syscall,   "system call"   },
 232         { QUAL_VERBOSE, "verbose",      qual_syscall,   "system call"   },
 233         { QUAL_VERBOSE, "v",            qual_syscall,   "system call"   },
 234         { QUAL_RAW,     "raw",          qual_syscall,   "system call"   },
 235         { QUAL_RAW,     "x",            qual_syscall,   "system call"   },
 236         { QUAL_SIGNAL,  "signal",       qual_signal,    "signal"        },
 237         { QUAL_SIGNAL,  "signals",      qual_signal,    "signal"        },
 238         { QUAL_SIGNAL,  "s",            qual_signal,    "signal"        },
 239         { QUAL_FAULT,   "fault",        qual_fault,     "fault"         },
 240         { QUAL_FAULT,   "faults",       qual_fault,     "fault"         },
 241         { QUAL_FAULT,   "m",            qual_fault,     "fault"         },
 242         { QUAL_READ,    "read",         qual_desc,      "descriptor"    },
 243         { QUAL_READ,    "reads",        qual_desc,      "descriptor"    },
 244         { QUAL_READ,    "r",            qual_desc,      "descriptor"    },
 245         { QUAL_WRITE,   "write",        qual_desc,      "descriptor"    },
 246         { QUAL_WRITE,   "writes",       qual_desc,      "descriptor"    },
 247         { QUAL_WRITE,   "w",            qual_desc,      "descriptor"    },
 248         { 0,            NULL,           NULL,           NULL            },
 249 };
 250
 251 static void
 252 qualify_one(n, opt, not)
 253         int n;
 254         struct qual_options *opt;
 255         int not;
 256 {
 257         if (not)
 258                 qual_flags[n] &= ~opt->bitflag;
 259         else
 260                 qual_flags[n] |= opt->bitflag;
 261 }
 262
 263 static int
 264 qual_syscall(s, opt, not)
 265         char *s;
 266         struct qual_options *opt;
 267         int not;
 268 {
 269         int i;
 270         int any = 0;
 271
 272         for (i = 0; i < nsyscalls; i++) {
 273                 if (strcmp(s, sysent[i].sys_name) == 0) {
 274                         qualify_one(i, opt, not);
 275                         any = 1;
 276                 }
 277         }
 278         return !any;
 279 }
 280
 281 static int
 282 qual_signal(s, opt, not)
 283         char *s;
 284         struct qual_options *opt;
 285         int not;
 286 {
 287         int i;
 288         char buf[32];
 289
 290         if (s && *s && isdigit((unsigned char)*s)) {
 291                 qualify_one(atoi(s), opt, not);
 292                 return 1;
 293         }
 294         strcpy(buf, s);
 295         s = buf;
 296         for (i = 0; s[i]; i++)
 297                 s[i] = toupper((unsigned char)(s[i]));
 298         if (strncmp(s, "SIG", 3) == 0)
 299                 s += 3;
 300         for (i = 0; i <= NSIG; i++)
 301                 if (strcmp(s, signame(i) + 3) == 0) {
 302                         qualify_one(atoi(s), opt, not);
 303                         return 1;
 304                 }
 305         return 0;
 306 }
 307
 308 static int
 309 qual_fault(s, opt, not)
 310         char *s;
 311         struct qual_options *opt;
 312         int not;
 313 {
 314         return -1;
 315 }
 316
 317 static int
 318 qual_desc(s, opt, not)
 319         char *s;
 320         struct qual_options *opt;
 321         int not;
 322 {
 323         if (s && *s && isdigit((unsigned char)*s)) {
 324                 qualify_one(atoi(s), opt, not);
 325                 return 0;
 326         }
 327         return -1;
 328 }
 329
 330 static int
 331 lookup_class(s)
 332         char *s;
 333 {
 334         if (strcmp(s, "file") == 0)
 335                 return TRACE_FILE;
 336         if (strcmp(s, "ipc") == 0)
 337                 return TRACE_IPC;
 338         if (strcmp(s, "network") == 0)
 339                 return TRACE_NETWORK;
 340         if (strcmp(s, "process") == 0)
 341                 return TRACE_PROCESS;
 342         if (strcmp(s, "signal") == 0)
 343                 return TRACE_SIGNAL;
 344         return -1;
 345 }
 346
 347 void
 348 qualify(s)
 349 char *s;
 350 {
 351         struct qual_options *opt;
 352         int not;
 353         char *p;
 354         int i, n;
 355
 356         opt = &qual_options[0];
 357         for (i = 0; (p = qual_options[i].option_name); i++) {
 358                 n = strlen(p);
 359                 if (strncmp(s, p, n) == 0 && s[n] == '=') {
 360                         opt = &qual_options[i];
 361                         s += n + 1;
 362                         break;
 363                 }
 364         }
 365         not = 0;
 366         if (*s == '!') {
 367                 not = 1;
 368                 s++;
 369         }
 370         if (strcmp(s, "none") == 0) {
 371                 not = 1 - not;
 372                 s = "all";
 373         }
 374         if (strcmp(s, "all") == 0) {
 375                 for (i = 0; i < MAX_QUALS; i++) {
 376                         if (not)
 377                                 qual_flags[i] &= ~opt->bitflag;
 378                         else
 379                                 qual_flags[i] |= opt->bitflag;
 380                 }
 381                 return;
 382         }
 383         for (i = 0; i < MAX_QUALS; i++) {
 384                 if (not)
 385                         qual_flags[i] |= opt->bitflag;
 386                 else
 387                         qual_flags[i] &= ~opt->bitflag;
 388         }
 389         for (p = strtok(s, ","); p; p = strtok(NULL, ",")) {
 390                 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
 391                         for (i = 0; i < MAX_QUALS; i++) {
 392                                 if (sysent[i].sys_flags & n) {
 393                                         if (not)
 394                                                 qual_flags[i] &= ~opt->bitflag;
 395                                         else
 396                                                 qual_flags[i] |= opt->bitflag;
 397                                 }
 398                         }
 399                         continue;
 400                 }
 401                 if (opt->qualify(p, opt, not)) {
 402                         fprintf(stderr, "strace: invalid %s `%s'\n",
 403                                 opt->argument_name, p);
 404                         exit(1);
 405                 }
 406         }
 407         return;
 408 }
 409
 410 static void
 411 dumpio(tcp)
 412 struct tcb *tcp;
 413 {
 414         if (syserror(tcp))
 415                 return;
 416         if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= MAX_QUALS)
 417                 return;
 418         switch (tcp->scno + NR_SYSCALL_BASE) {
 419         case SYS_read:
 420 #ifdef SYS_recv
 421         case SYS_recv:
 422 #endif
 423 #ifdef SYS_recvfrom
 424         case SYS_recvfrom:
 425 #endif
 426                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 427                         dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
 428                 break;
 429         case SYS_write:
 430 #ifdef SYS_send
 431         case SYS_send:
 432 #endif
 433 #ifdef SYS_sendto
 434         case SYS_sendto:
 435 #endif
 436                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 437                         dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 438                 break;
 439 #ifdef SYS_readv
 440         case SYS_readv:
 441                 if (qual_flags[tcp->u_arg[0]] & QUAL_READ)
 442                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 443                 break;
 444 #endif
 445 #ifdef SYS_writev
 446         case SYS_writev:
 447
 448                 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE)
 449                         dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
 450                 break;
 451 #endif
 452         }
 453 }
 454
 455 #ifndef FREEBSD
 456 enum subcall_style { shift_style, deref_style, mask_style, door_style };
 457 #else /* FREEBSD */
 458 enum subcall_style { shift_style, deref_style, mask_style, door_style, table_style };
 459
 460 struct subcall {
 461   int call;
 462   int nsubcalls;
 463   int subcalls[5];
 464 };
 465
 466 const struct subcall subcalls_table[] = {
 467   { SYS_shmsys, 5, { SYS_shmat, SYS_shmctl, SYS_shmdt, SYS_shmget, SYS_shmctl } },
 468 #ifdef SYS_semconfig
 469   { SYS_semsys, 4, { SYS___semctl, SYS_semget, SYS_semop, SYS_semconfig } },
 470 #else
 471   { SYS_semsys, 3, { SYS___semctl, SYS_semget, SYS_semop } },
 472 #endif
 473   { SYS_msgsys, 4, { SYS_msgctl, SYS_msgget, SYS_msgsnd, SYS_msgrcv } },
 474 };
 475 #endif /* FREEBSD */
 476
 477 #if !(defined(LINUX) && ( defined(ALPHA) || defined(MIPS) ))
 478
 479 const int socket_map [] = {
 480                /* SYS_SOCKET      */ 97,
 481                /* SYS_BIND        */ 104,
 482                /* SYS_CONNECT     */ 98,
 483                /* SYS_LISTEN      */ 106,
 484                /* SYS_ACCEPT      */ 99,
 485                /* SYS_GETSOCKNAME */ 150,
 486                /* SYS_GETPEERNAME */ 141,
 487                /* SYS_SOCKETPAIR  */ 135,
 488                /* SYS_SEND        */ 101,
 489                /* SYS_RECV        */ 102,
 490                /* SYS_SENDTO      */ 133,
 491                /* SYS_RECVFROM    */ 125,
 492                /* SYS_SHUTDOWN    */ 134,
 493                /* SYS_SETSOCKOPT  */ 105,
 494                /* SYS_GETSOCKOPT  */ 118,
 495                /* SYS_SENDMSG     */ 114,
 496                /* SYS_RECVMSG     */ 113
 497 };
 498
 499 void
 500 sparc_socket_decode (tcp)
 501 struct tcb *tcp;
 502 {
 503         volatile long addr;
 504         volatile int i, n;
 505
 506         if (tcp->u_arg [0] < 1 || tcp->u_arg [0] > sizeof(socket_map)/sizeof(int)+1){
 507                 return;
 508         }
 509         tcp->scno = socket_map [tcp->u_arg [0]-1];
 510         n = tcp->u_nargs = sysent [tcp->scno].nargs;
 511         addr = tcp->u_arg [1];
 512         for (i = 0; i < n; i++){
 513                 int arg;
 514                 if (umoven (tcp, addr, sizeof (arg), (void *) &arg) < 0)
 515                         arg = 0;
 516                 tcp->u_arg [i] = arg;
 517                 addr += sizeof (arg);
 518         }
 519 }
 520
 521 void
 522 decode_subcall(tcp, subcall, nsubcalls, style)
 523 struct tcb *tcp;
 524 int subcall;
 525 int nsubcalls;
 526 enum subcall_style style;
 527 {
 528         long addr, mask, arg;
 529         int i;
 530
 531         switch (style) {
 532         case shift_style:
 533                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 534                         return;
 535                 tcp->scno = subcall + tcp->u_arg[0];
 536                 if (sysent[tcp->scno].nargs != -1)
 537                         tcp->u_nargs = sysent[tcp->scno].nargs;
 538                 else
 539                         tcp->u_nargs--;
 540                 for (i = 0; i < tcp->u_nargs; i++)
 541                         tcp->u_arg[i] = tcp->u_arg[i + 1];
 542                 break;
 543         case deref_style:
 544                 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= nsubcalls)
 545                         return;
 546                 tcp->scno = subcall + tcp->u_arg[0];
 547                 addr = tcp->u_arg[1];
 548                 for (i = 0; i < sysent[tcp->scno].nargs; i++) {
 549                         if (umove(tcp, addr, &arg) < 0)
 550                                 arg = 0;
 551                         tcp->u_arg[i] = arg;
 552                         addr += sizeof(arg);
 553                 }
 554                 tcp->u_nargs = sysent[tcp->scno].nargs;
 555                 break;
 556         case mask_style:
 557                 mask = (tcp->u_arg[0] >> 8) & 0xff;
 558                 for (i = 0; mask; i++)
 559                         mask >>= 1;
 560                 if (i >= nsubcalls)
 561                         return;
 562                 tcp->u_arg[0] &= 0xff;
 563                 tcp->scno = subcall + i;
 564                 if (sysent[tcp->scno].nargs != -1)
 565                         tcp->u_nargs = sysent[tcp->scno].nargs;
 566                 break;
 567         case door_style:
 568                 /*
 569                  * Oh, yuck.  The call code is the *sixth* argument.
 570                  * (don't you mean the *last* argument? - JH)
 571                  */
 572                 if (tcp->u_arg[5] < 0 || tcp->u_arg[5] >= nsubcalls)
 573                         return;
 574                 tcp->scno = subcall + tcp->u_arg[5];
 575                 if (sysent[tcp->scno].nargs != -1)
 576                         tcp->u_nargs = sysent[tcp->scno].nargs;
 577                 else
 578                         tcp->u_nargs--;
 579                 break;
 580 #ifdef FREEBSD
 581         case table_style:
 582                 for (i = 0; i < sizeof(subcalls_table) / sizeof(struct subcall); i++)
 583                         if (subcalls_table[i].call == tcp->scno) break;
 584                 if (i < sizeof(subcalls_table) / sizeof(struct subcall) &&
 585                     tcp->u_arg[0] >= 0 && tcp->u_arg[0] < subcalls_table[i].nsubcalls) {
 586                         tcp->scno = subcalls_table[i].subcalls[tcp->u_arg[0]];
 587                         for (i = 0; i < tcp->u_nargs; i++)
 588                                 tcp->u_arg[i] = tcp->u_arg[i + 1];
 589                 }
 590                 break;
 591 #endif /* FREEBSD */
 592         }
 593 }
 594 #endif
 595
 596 struct tcb *tcp_last = NULL;
 597
 598 static int
 599 internal_syscall(tcp)
 600 struct tcb *tcp;
 601 {
 602         /*
 603          * We must always trace a few critical system calls in order to
 604          * correctly support following forks in the presence of tracing
 605          * qualifiers.
 606          */
 607         switch (tcp->scno + NR_SYSCALL_BASE) {
 608 #ifdef SYS_fork
 609         case SYS_fork:
 610 #endif
 611 #ifdef SYS_vfork
 612         case SYS_vfork:
 613 #endif
 614 #ifdef SYS_fork1
 615         case SYS_fork1:
 616 #endif
 617 #ifdef SYS_forkall
 618         case SYS_forkall:
 619 #endif
 620 #ifdef SYS_rfork1
 621         case SYS_rfork1:
 622 #endif
 623 #ifdef SYS_rforkall
 624         case SYS_rforkall:
 625 #endif
 626 #ifdef SYS_rfork
 627         case SYS_rfork:
 628 #endif
 629                 internal_fork(tcp);
 630                 break;
 631 #ifdef SYS_clone
 632         case SYS_clone:
 633                 internal_clone(tcp);
 634                 break;
 635 #endif
 636 #ifdef SYS_clone2
 637         case SYS_clone2:
 638                 internal_clone(tcp);
 639                 break;
 640 #endif
 641 #ifdef SYS_execv
 642         case SYS_execv:
 643 #endif
 644 #ifdef SYS_execve
 645         case SYS_execve:
 646 #endif
 647 #ifdef SYS_rexecve
 648         case SYS_rexecve:
 649 #endif
 650                 internal_exec(tcp);
 651                 break;
 652
 653 #ifdef SYS_wait
 654         case SYS_wait:
 655 #endif
 656 #ifdef SYS_wait4
 657         case SYS_wait4:
 658 #endif
 659 #ifdef SYS32_wait4
 660         case SYS32_wait4:
 661 #endif
 662 #ifdef SYS_waitpid
 663         case SYS_waitpid:
 664 #endif
 665 #ifdef SYS_waitsys
 666         case SYS_waitsys:
 667 #endif
 668                 internal_wait(tcp);
 669                 break;
 670
 671 #ifdef SYS_exit
 672         case SYS_exit:
 673 #endif
 674 #ifdef SYS32_exit
 675         case SYS32_exit:
 676 #endif
 677 #ifdef __NR_exit_group
 678         case __NR_exit_group:
 679 #endif
 680                 internal_exit(tcp);
 681                 break;
 682         }
 683         return 0;
 684 }
 685
 686
 687 #ifdef LINUX
 688 #if defined (I386)
 689         static long eax;
 690 #elif defined (IA64)
 691         long r8, r10, psr;
 692         long ia32 = 0;
 693 #elif defined (POWERPC)
 694         static long result,flags;
 695 #elif defined (M68K)
 696         static int d0;
 697 #elif defined (ARM)
 698         static struct pt_regs regs;
 699 #elif defined (ALPHA)
 700         static long r0;
 701         static long a3;
 702 #elif defined (SPARC)
 703         static struct regs regs;
 704         static unsigned long trap;
 705 #elif defined(MIPS)
 706         static long a3;
 707         static long r2;
 708 #elif defined(S390) || defined(S390X)
 709         static long gpr2;
 710         static long pc;
 711         static long syscall_mode;
 712 #elif defined(HPPA)
 713         static long r28;
 714 #elif defined(SH)
 715        static long r0;
 716 #elif defined(SHMEDIA)
 717        static long r9;
 718 #elif defined(X86_64)
 719        static long rax;
 720 #endif
 721 #endif /* LINUX */
 722 #ifdef FREEBSD
 723         struct reg regs;
 724 #endif /* FREEBSD */
 725
 726 int
 727 get_scno(tcp)
 728 struct tcb *tcp;
 729 {
 730         long scno = 0;
 731 #ifndef USE_PROCFS
 732         int pid = tcp->pid;
 733 #endif /* !PROCFS */
 734
 735 #ifdef LINUX
 736 #if defined(S390) || defined(S390X)
 737         if (upeek(pid, PT_GPR2, &syscall_mode) < 0)
 738                 return -1;
 739         if (syscall_mode != -ENOSYS) {
 740                 /*
 741                  * Since kernel version 2.5.44 the scno gets passed in gpr2.
 742                  */
 743                 scno = syscall_mode;
 744         }
 745         if (tcp->flags & TCB_WAITEXECVE) {
 746                 /*
 747                  * When the execve system call completes successfully, the
 748                  * new process still has -ENOSYS (old style) or __NR_execve
 749                  * (new style) in gpr2.  We cannot recover the scno again
 750                  * by disassembly, because the image that executed the
 751                  * syscall is gone now.  Fortunately, we don't want it.  We
 752                  * leave the flag set so that syscall_fixup can fake the
 753                  * result.
 754                  */
 755                 if (tcp->flags & TCB_INSYSCALL)
 756                         return 1;
 757                 /*
 758                  * This is the SIGTRAP after execve.  We cannot try to read
 759                  * the system call here either.
 760                  */
 761                 tcp->flags &= ~TCB_WAITEXECVE;
 762                 return 0;
 763         }
 764         else {
 765                 /*
 766                  * Old style of "passing" the scno via the SVC instruction.
 767                  */
 768
 769                 long opcode, offset_reg, tmp;
 770                 void * svc_addr;
 771                 int gpr_offset[16] = {PT_GPR0,  PT_GPR1,  PT_ORIGGPR2, PT_GPR3,
 772                                       PT_GPR4,  PT_GPR5,  PT_GPR6,     PT_GPR7,
 773                                       PT_GPR8,  PT_GPR9,  PT_GPR10,    PT_GPR11,
 774                                       PT_GPR12, PT_GPR13, PT_GPR14,    PT_GPR15};
 775
 776                 if (upeek(pid, PT_PSWADDR, &pc) < 0)
 777                         return -1;
 778                 errno = 0;
 779                 opcode = ptrace(PTRACE_PEEKTEXT, pid, (char *)(pc-sizeof(long)), 0);
 780                 if (errno) {
 781                         perror("peektext(pc-oneword)");
 782                         return -1;
 783                 }
 784
 785                 /*
 786                  *  We have to check if the SVC got executed directly or via an
 787                  *  EXECUTE instruction. In case of EXECUTE it is necessary to do
 788                  *  instruction decoding to derive the system call number.
 789                  *  Unfortunately the opcode sizes of EXECUTE and SVC are differently,
 790                  *  so that this doesn't work if a SVC opcode is part of an EXECUTE
 791                  *  opcode. Since there is no way to find out the opcode size this
 792                  *  is the best we can do...
 793                  */
 794
 795                 if ((opcode & 0xff00) == 0x0a00) {
 796                         /* SVC opcode */
 797                         scno = opcode & 0xff;
 798                 }
 799                 else {
 800                         /* SVC got executed by EXECUTE instruction */
 801
 802                         /*
 803                          *  Do instruction decoding of EXECUTE. If you really want to
 804                          *  understand this, read the Principles of Operations.
 805                          */
 806                         svc_addr = (void *) (opcode & 0xfff);
 807
 808                         tmp = 0;
 809                         offset_reg = (opcode & 0x000f0000) >> 16;
 810                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 811                                 return -1;
 812                         svc_addr += tmp;
 813
 814                         tmp = 0;
 815                         offset_reg = (opcode & 0x0000f000) >> 12;
 816                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 817                                 return -1;
 818                         svc_addr += tmp;
 819
 820                         scno = ptrace(PTRACE_PEEKTEXT, pid, svc_addr, 0);
 821                         if (errno)
 822                                 return -1;
 823 #if defined(S390X)
 824                         scno >>= 48;
 825 #else
 826                         scno >>= 16;
 827 #endif
 828                         tmp = 0;
 829                         offset_reg = (opcode & 0x00f00000) >> 20;
 830                         if (offset_reg && (upeek(pid, gpr_offset[offset_reg], &tmp) < 0))
 831                                 return -1;
 832
 833                         scno = (scno | tmp) & 0xff;
 834                 }
 835         }
 836 #elif defined (POWERPC)
 837         if (upeek(pid, sizeof(unsigned long)*PT_R0, &scno) < 0)
 838                 return -1;
 839         if (!(tcp->flags & TCB_INSYSCALL)) {
 840                 /* Check if we return from execve. */
 841                 if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 842                         tcp->flags &= ~TCB_WAITEXECVE;
 843                         return 0;
 844                 }
 845         }
 846 #elif defined (I386)
 847         if (upeek(pid, 4*ORIG_EAX, &scno) < 0)
 848                 return -1;
 849 #elif defined (X86_64)
 850         if (upeek(pid, 8*ORIG_RAX, &scno) < 0)
 851                 return -1;
 852
 853         if (!(tcp->flags & TCB_INSYSCALL)) {
 854                 static int currpers=-1;
 855                 long val;
 856
 857                 /* Check CS register value. On x86-64 linux it is:
 858                  *      0x33    for long mode (64 bit)
 859                  *      0x23    for compatibility mode (32 bit)
 860                  * It takes only one ptrace and thus doesn't need
 861                  * to be cached.
 862                  */
 863                 if (upeek(pid, 8*CS, &val) < 0)
 864                         return -1;
 865                 switch(val)
 866                 {
 867                         case 0x23: currpers = 1; break;
 868                         case 0x33: currpers = 0; break;
 869                         default:
 870                                 fprintf(stderr, "Unknown value CS=0x%02X while "
 871                                          "detecting personality of process "
 872                                          "PID=%d\n", (int)val, pid);
 873                                 currpers = current_personality;
 874                                 break;
 875                 }
 876 #if 0
 877                 /* This version analyzes the opcode of a syscall instruction.
 878                  * (int 0x80 on i386 vs. syscall on x86-64)
 879                  * It works, but is too complicated.
 880                  */
 881                 unsigned long val, rip, i;
 882
 883                 if(upeek(pid, 8*RIP, &rip)<0)
 884                         perror("upeek(RIP)");
 885
 886                 /* sizeof(syscall) == sizeof(int 0x80) == 2 */
 887                 rip-=2;
 888                 errno = 0;
 889
 890                 call = ptrace(PTRACE_PEEKTEXT,pid,(char *)rip,0);
 891                 if (errno)
 892                         printf("ptrace_peektext failed: %s\n",
 893                                         strerror(errno));
 894                 switch (call & 0xffff)
 895                 {
 896                         /* x86-64: syscall = 0x0f 0x05 */
 897                         case 0x050f: currpers = 0; break;
 898                         /* i386: int 0x80 = 0xcd 0x80 */
 899                         case 0x80cd: currpers = 1; break;
 900                         default:
 901                                 currpers = current_personality;
 902                                 fprintf(stderr,
 903                                         "Unknown syscall opcode (0x%04X) while "
 904                                         "detecting personality of process "
 905                                         "PID=%d\n", (int)call, pid);
 906                                 break;
 907                 }
 908 #endif
 909                 if(currpers != current_personality)
 910                 {
 911                         char *names[]={"64 bit", "32 bit"};
 912                         set_personality(currpers);
 913                         printf("[ Process PID=%d runs in %s mode. ]\n",
 914                                         pid, names[current_personality]);
 915                 }
 916         }
 917 #elif defined(IA64)
 918 #       define IA64_PSR_IS      ((long)1 << 34)
 919         if (upeek (pid, PT_CR_IPSR, &psr) >= 0)
 920                 ia32 = (psr & IA64_PSR_IS) != 0;
 921         if (!(tcp->flags & TCB_INSYSCALL)) {
 922                 if (ia32) {
 923                         if (upeek(pid, PT_R1, &scno) < 0)       /* orig eax */
 924                                 return -1;
 925                 } else {
 926                         if (upeek (pid, PT_R15, &scno) < 0)
 927                                 return -1;
 928                 }
 929                 /* Check if we return from execve. */
 930                 if (tcp->flags & TCB_WAITEXECVE) {
 931                         tcp->flags &= ~TCB_WAITEXECVE;
 932                         return 0;
 933                 }
 934         } else {
 935                 /* syscall in progress */
 936                 if (upeek (pid, PT_R8, &r8) < 0)
 937                         return -1;
 938                 if (upeek (pid, PT_R10, &r10) < 0)
 939                         return -1;
 940         }
 941 #elif defined (ARM)
 942         /*
 943          * Read complete register set in one go.
 944          */
 945         if (ptrace(PTRACE_GETREGS, pid, NULL, (void *)&regs) == -1)
 946                 return -1;
 947
 948         /*
 949          * We only need to grab the syscall number on syscall entry.
 950          */
 951         if (regs.ARM_ip == 0) {
 952                 /*
 953                  * Note: we only deal with only 32-bit CPUs here.
 954                  */
 955                 if (regs.ARM_cpsr & 0x20) {
 956                         /*
 957                          * Get the Thumb-mode system call number
 958                          */
 959                         scno = regs.ARM_r7;
 960                 } else {
 961                         /*
 962                          * Get the ARM-mode system call number
 963                          */
 964                         errno = 0;
 965                         scno = ptrace(PTRACE_PEEKTEXT, pid, (void *)(regs.ARM_pc - 4), NULL);
 966                         if (errno)
 967                                 return -1;
 968
 969                         if (scno == 0 && (tcp->flags & TCB_WAITEXECVE)) {
 970                                 tcp->flags &= ~TCB_WAITEXECVE;
 971                                 return 0;
 972                         }
 973
 974                         if ((scno & 0x0ff00000) != 0x0f900000) {
 975                                 fprintf(stderr, "syscall: unknown syscall trap 0x%08lx\n",
 976                                         scno);
 977                                 return -1;
 978                         }
 979
 980                         /*
 981                          * Fixup the syscall number
 982                          */
 983                         scno &= 0x000fffff;
 984                 }
 985
 986                 if (tcp->flags & TCB_INSYSCALL) {
 987                         fprintf(stderr, "pid %d stray syscall entry\n", tcp->pid);
 988                         tcp->flags &= ~TCB_INSYSCALL;
 989                 }
 990         } else {
 991                 if (!(tcp->flags & TCB_INSYSCALL)) {
 992                         fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
 993                         tcp->flags |= TCB_INSYSCALL;
 994                 }
 995         }
 996 #elif defined (M68K)
 997         if (upeek(pid, 4*PT_ORIG_D0, &scno) < 0)
 998                 return -1;
 999 #elif defined (MIPS)
1000         if (upeek(pid, REG_A3, &a3) < 0)
1001                 return -1;
1002
1003         if(!(tcp->flags & TCB_INSYSCALL)) {
1004                 if (upeek(pid, REG_V0, &scno) < 0)
1005                         return -1;
1006
1007                 if (scno < 0 || scno > nsyscalls) {
1008                         if(a3 == 0 || a3 == -1) {
1009                                 if(debug)
1010                                         fprintf (stderr, "stray syscall exit: v0 = %ld\n", scno);
1011                                 return 0;
1012                         }
1013                 }
1014         } else {
1015                 if (upeek(pid, REG_V0, &r2) < 0)
1016                         return -1;
1017         }
1018 #elif defined (ALPHA)
1019         if (upeek(pid, REG_A3, &a3) < 0)
1020                 return -1;
1021
1022         if (!(tcp->flags & TCB_INSYSCALL)) {
1023                 if (upeek(pid, REG_R0, &scno) < 0)
1024                         return -1;
1025
1026                 /* Check if we return from execve. */
1027                 if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
1028                         tcp->flags &= ~TCB_WAITEXECVE;
1029                         return 0;
1030                 }
1031
1032                 /*
1033                  * Do some sanity checks to figure out if it's
1034                  * really a syscall entry
1035                  */
1036                 if (scno < 0 || scno > nsyscalls) {
1037                         if (a3 == 0 || a3 == -1) {
1038                                 if (debug)
1039                                         fprintf (stderr, "stray syscall exit: r0 = %ld\n", scno);
1040                                 return 0;
1041                         }
1042                 }
1043         }
1044         else {
1045                 if (upeek(pid, REG_R0, &r0) < 0)
1046                         return -1;
1047         }
1048 #elif defined (SPARC)
1049         /* Everything we need is in the current register set. */
1050         if (ptrace(PTRACE_GETREGS,pid,(char *)&regs,0) < 0)
1051                 return -1;
1052
1053         /* If we are entering, then disassemble the syscall trap. */
1054         if (!(tcp->flags & TCB_INSYSCALL)) {
1055                 /* Retrieve the syscall trap instruction. */
1056                 errno = 0;
1057                 trap = ptrace(PTRACE_PEEKTEXT,pid,(char *)regs.r_pc,0);
1058                 if (errno)
1059                         return -1;
1060
1061                 /* Disassemble the trap to see what personality to use. */
1062                 switch (trap) {
1063                 case 0x91d02010:
1064                         /* Linux/SPARC syscall trap. */
1065                         set_personality(0);
1066                         break;
1067                 case 0x91d0206d:
1068                         /* Linux/SPARC64 syscall trap. */
1069                         fprintf(stderr,"syscall: Linux/SPARC64 not supported yet\n");
1070                         return -1;
1071                 case 0x91d02000:
1072                         /* SunOS syscall trap. (pers 1) */
1073                         fprintf(stderr,"syscall: SunOS no support\n");
1074                         return -1;
1075                 case 0x91d02008:
1076                         /* Solaris 2.x syscall trap. (per 2) */
1077                         set_personality(1);
1078                         break;
1079                 case 0x91d02009:
1080                         /* NetBSD/FreeBSD syscall trap. */
1081                         fprintf(stderr,"syscall: NetBSD/FreeBSD not supported\n");
1082                         return -1;
1083                 case 0x91d02027:
1084                         /* Solaris 2.x gettimeofday */
1085                         set_personality(1);
1086                         break;
1087                 default:
1088                         /* Unknown syscall trap. */
1089                         if(tcp->flags & TCB_WAITEXECVE) {
1090                                 tcp->flags &= ~TCB_WAITEXECVE;
1091                                 return 0;
1092                         }
1093                         fprintf(stderr,"syscall: unknown syscall trap %08x %08x\n", trap, regs.r_pc);
1094                         return -1;
1095                 }
1096
1097                 /* Extract the system call number from the registers. */
1098                 if (trap == 0x91d02027)
1099                         scno = 156;
1100                 else
1101                         scno = regs.r_g1;
1102                 if (scno == 0) {
1103                         scno = regs.r_o0;
1104                         memmove (&regs.r_o0, &regs.r_o1, 7*sizeof(regs.r_o0));
1105                 }
1106         }
1107 #elif defined(HPPA)
1108         if (upeek(pid, PT_GR20, &scno) < 0)
1109                 return -1;
1110         if (!(tcp->flags & TCB_INSYSCALL)) {
1111                 /* Check if we return from execve. */
1112                 if ((tcp->flags & TCB_WAITEXECVE)) {
1113                         tcp->flags &= ~TCB_WAITEXECVE;
1114                         return 0;
1115                 }
1116         }
1117 #elif defined(SH)
1118        /*
1119         * In the new syscall ABI, the system call number is in R3.
1120         */
1121        if (upeek(pid, 4*(REG_REG0+3), &scno) < 0)
1122                return -1;
1123
1124        if (scno < 0) {
1125            /* Odd as it may seem, a glibc bug has been known to cause
1126               glibc to issue bogus negative syscall numbers.  So for
1127               our purposes, make strace print what it *should* have been */
1128            long correct_scno = (scno & 0xff);
1129            if (debug)
1130                fprintf(stderr,
1131                    "Detected glibc bug: bogus system call number = %ld, "
1132                    "correcting to %ld\n",
1133                    scno,
1134                    correct_scno);
1135            scno = correct_scno;
1136        }
1137
1138
1139        if (!(tcp->flags & TCB_INSYSCALL)) {
1140                /* Check if we return from execve. */
1141                if (scno == 0 && tcp->flags & TCB_WAITEXECVE) {
1142                        tcp->flags &= ~TCB_WAITEXECVE;
1143                        return 0;
1144                }
1145        }
1146 #elif defined(SHMEDIA)
1147         if (upeek(pid, REG_SYSCALL, &scno) < 0)
1148                 return -1;
1149         scno &= 0xFFFF;
1150
1151         if (!(tcp->flags & TCB_INSYSCALL)) {
1152                 /* Check if we return from execve. */
1153                 if (tcp->flags & TCB_WAITEXECVE) {
1154                         tcp->flags &= ~TCB_WAITEXECVE;
1155                         return 0;
1156                 }
1157         }
1158 #endif /* SHMEDIA */
1159 #endif /* LINUX */
1160 #ifdef SUNOS4
1161         if (upeek(pid, uoff(u_arg[7]), &scno) < 0)
1162                 return -1;
1163 #elif defined(SH)
1164         /* new syscall ABI returns result in R0 */
1165         if (upeek(pid, 4*REG_REG0, (long *)&r0) < 0)
1166                 return -1;
1167 #elif defined(SHMEDIA)
1168         /* ABI defines result returned in r9 */
1169         if (upeek(pid, REG_GENERAL(9), (long *)&r9) < 0)
1170                 return -1;
1171
1172 #endif
1173 #ifdef USE_PROCFS
1174 #ifdef HAVE_PR_SYSCALL
1175         scno = tcp->status.PR_SYSCALL;
1176 #else /* !HAVE_PR_SYSCALL */
1177 #ifndef FREEBSD
1178         scno = tcp->status.PR_WHAT;
1179 #else /* FREEBSD */
1180         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1181                 perror("pread");
1182                 return -1;
1183         }
1184         switch (regs.r_eax) {
1185         case SYS_syscall:
1186         case SYS___syscall:
1187                 pread(tcp->pfd, &scno, sizeof(scno), regs.r_esp + sizeof(int));
1188                 break;
1189         default:
1190                 scno = regs.r_eax;
1191                 break;
1192         }
1193 #endif /* FREEBSD */
1194 #endif /* !HAVE_PR_SYSCALL */
1195 #endif /* USE_PROCFS */
1196         if (!(tcp->flags & TCB_INSYSCALL))
1197                 tcp->scno = scno;
1198         return 1;
1199 }
1200
1201
1202 int
1203 syscall_fixup(tcp)
1204 struct tcb *tcp;
1205 {
1206 #ifndef USE_PROCFS
1207         int pid = tcp->pid;
1208 #else /* USE_PROCFS */
1209         int scno = tcp->scno;
1210
1211         if (!(tcp->flags & TCB_INSYSCALL)) {
1212                 if (tcp->status.PR_WHY != PR_SYSENTRY) {
1213                         if (
1214                             scno == SYS_fork
1215 #ifdef SYS_vfork
1216                             || scno == SYS_vfork
1217 #endif /* SYS_vfork */
1218 #ifdef SYS_fork1
1219                             || scno == SYS_fork1
1220 #endif /* SYS_fork1 */
1221 #ifdef SYS_forkall
1222                             || scno == SYS_forkall
1223 #endif /* SYS_forkall */
1224 #ifdef SYS_rfork1
1225                             || scno == SYS_rfork1
1226 #endif /* SYS_fork1 */
1227 #ifdef SYS_rforkall
1228                             || scno == SYS_rforkall
1229 #endif /* SYS_rforkall */
1230                             ) {
1231                                 /* We are returning in the child, fake it. */
1232                                 tcp->status.PR_WHY = PR_SYSENTRY;
1233                                 trace_syscall(tcp);
1234                                 tcp->status.PR_WHY = PR_SYSEXIT;
1235                         }
1236                         else {
1237                                 fprintf(stderr, "syscall: missing entry\n");
1238                                 tcp->flags |= TCB_INSYSCALL;
1239                         }
1240                 }
1241         }
1242         else {
1243                 if (tcp->status.PR_WHY != PR_SYSEXIT) {
1244                         fprintf(stderr, "syscall: missing exit\n");
1245                         tcp->flags &= ~TCB_INSYSCALL;
1246                 }
1247         }
1248 #endif /* USE_PROCFS */
1249 #ifdef SUNOS4
1250         if (!(tcp->flags & TCB_INSYSCALL)) {
1251                 if (scno == 0) {
1252                         fprintf(stderr, "syscall: missing entry\n");
1253                         tcp->flags |= TCB_INSYSCALL;
1254                 }
1255         }
1256         else {
1257                 if (scno != 0) {
1258                         if (debug) {
1259                                 /*
1260                                  * This happens when a signal handler
1261                                  * for a signal which interrupted a
1262                                  * a system call makes another system call.
1263                                  */
1264                                 fprintf(stderr, "syscall: missing exit\n");
1265                         }
1266                         tcp->flags &= ~TCB_INSYSCALL;
1267                 }
1268         }
1269 #endif /* SUNOS4 */
1270 #ifdef LINUX
1271 #if defined (I386)
1272         if (upeek(pid, 4*EAX, &eax) < 0)
1273                 return -1;
1274         if (eax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1275                 if (debug)
1276                         fprintf(stderr, "stray syscall exit: eax = %ld\n", eax);
1277                 return 0;
1278         }
1279 #elif defined (X86_64)
1280         if (upeek(pid, 8*RAX, &rax) < 0)
1281                 return -1;
1282         if (rax != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1283                 if (debug)
1284                         fprintf(stderr, "stray syscall exit: rax = %ld\n", rax);
1285                 return 0;
1286         }
1287 #elif defined (S390) || defined (S390X)
1288         if (upeek(pid, PT_GPR2, &gpr2) < 0)
1289                 return -1;
1290         if (syscall_mode != -ENOSYS)
1291                 syscall_mode = tcp->scno;
1292         if (gpr2 != syscall_mode && !(tcp->flags & TCB_INSYSCALL)) {
1293                 if (debug)
1294                         fprintf(stderr, "stray syscall exit: gpr2 = %ld\n", gpr2);
1295                 return 0;
1296         }
1297         else if (((tcp->flags & (TCB_INSYSCALL|TCB_WAITEXECVE))
1298                   == (TCB_INSYSCALL|TCB_WAITEXECVE))
1299                  && (gpr2 == -ENOSYS || gpr2 == tcp->scno)) {
1300                 /*
1301                  * Fake a return value of zero.  We leave the TCB_WAITEXECVE
1302                  * flag set for the post-execve SIGTRAP to see and reset.
1303                  */
1304                 gpr2 = 0;
1305         }
1306 #elif defined (POWERPC)
1307 # define SO_MASK 0x10000000
1308         if (upeek(pid, sizeof(unsigned long)*PT_CCR, &flags) < 0)
1309                 return -1;
1310         if (upeek(pid, sizeof(unsigned long)*PT_R3, &result) < 0)
1311                 return -1;
1312         if (flags & SO_MASK)
1313                 result = -result;
1314 #elif defined (M68K)
1315         if (upeek(pid, 4*PT_D0, &d0) < 0)
1316                 return -1;
1317         if (d0 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1318                 if (debug)
1319                         fprintf(stderr, "stray syscall exit: d0 = %ld\n", d0);
1320                 return 0;
1321         }
1322 #elif defined (ARM)
1323         /*
1324          * Nothing required
1325          */
1326 #elif defined (HPPA)
1327         if (upeek(pid, PT_GR28, &r28) < 0)
1328                 return -1;
1329 #elif defined(IA64)
1330         if (upeek(pid, PT_R10, &r10) < 0)
1331                 return -1;
1332         if (upeek(pid, PT_R8, &r8) < 0)
1333                 return -1;
1334         if (ia32 && r8 != -ENOSYS && !(tcp->flags & TCB_INSYSCALL)) {
1335                 if (debug)
1336                         fprintf(stderr, "stray syscall exit: r8 = %ld\n", r8);
1337                 return 0;
1338         }
1339 #endif
1340 #endif /* LINUX */
1341         return 1;
1342 }
1343
1344 int
1345 get_error(tcp)
1346 struct tcb *tcp;
1347 {
1348         int u_error = 0;
1349 #ifdef LINUX
1350 #if defined(S390) || defined(S390X)
1351                 if (gpr2 && (unsigned) -gpr2 < nerrnos) {
1352                         tcp->u_rval = -1;
1353                         u_error = -gpr2;
1354                 }
1355                 else {
1356                         tcp->u_rval = gpr2;
1357                         u_error = 0;
1358                 }
1359 #else /* !S390 && !S390X */
1360 #ifdef I386
1361                 if (eax < 0 && -eax < nerrnos) {
1362                         tcp->u_rval = -1;
1363                         u_error = -eax;
1364                 }
1365                 else {
1366                         tcp->u_rval = eax;
1367                         u_error = 0;
1368                 }
1369 #else /* !I386 */
1370 #ifdef X86_64
1371                 if (rax < 0 && -rax < nerrnos) {
1372                         tcp->u_rval = -1;
1373                         u_error = -rax;
1374                 }
1375                 else {
1376                         tcp->u_rval = rax;
1377                         u_error = 0;
1378                 }
1379 #else
1380 #ifdef IA64
1381                 if (ia32) {
1382                         int err;
1383
1384                         err = (int)r8;
1385                         if (err < 0 && -err < nerrnos) {
1386                                 tcp->u_rval = -1;
1387                                 u_error = -err;
1388                         }
1389                         else {
1390                                 tcp->u_rval = err;
1391                                 u_error = 0;
1392                         }
1393                 } else {
1394                         if (r10) {
1395                                 tcp->u_rval = -1;
1396                                 u_error = r8;
1397                         } else {
1398                                 tcp->u_rval = r8;
1399                                 u_error = 0;
1400                         }
1401                 }
1402 #else /* !IA64 */
1403 #ifdef MIPS
1404                 if (a3) {
1405                         tcp->u_rval = -1;
1406                         u_error = r2;
1407                 } else {
1408                         tcp->u_rval = r2;
1409                         u_error = 0;
1410                 }
1411 #else
1412 #ifdef POWERPC
1413                 if (result && (unsigned) -result < nerrnos) {
1414                         tcp->u_rval = -1;
1415                         u_error = -result;
1416                 }
1417                 else {
1418                         tcp->u_rval = result;
1419                         u_error = 0;
1420                 }
1421 #else /* !POWERPC */
1422 #ifdef M68K
1423                 if (d0 && (unsigned) -d0 < nerrnos) {
1424                         tcp->u_rval = -1;
1425                         u_error = -d0;
1426                 }
1427                 else {
1428                         tcp->u_rval = d0;
1429                         u_error = 0;
1430                 }
1431 #else /* !M68K */
1432 #ifdef ARM
1433                 if (regs.ARM_r0 && (unsigned) -regs.ARM_r0 < nerrnos) {
1434                         tcp->u_rval = -1;
1435                         u_error = -regs.ARM_r0;
1436                 }
1437                 else {
1438                         tcp->u_rval = regs.ARM_r0;
1439                         u_error = 0;
1440                 }
1441 #else /* !ARM */
1442 #ifdef ALPHA
1443                 if (a3) {
1444                         tcp->u_rval = -1;
1445                         u_error = r0;
1446                 }
1447                 else {
1448                         tcp->u_rval = r0;
1449                         u_error = 0;
1450                 }
1451 #else /* !ALPHA */
1452 #ifdef SPARC
1453                 if (regs.r_psr & PSR_C) {
1454                         tcp->u_rval = -1;
1455                         u_error = regs.r_o0;
1456                 }
1457                 else {
1458                         tcp->u_rval = regs.r_o0;
1459                         u_error = 0;
1460                 }
1461 #else /* !SPARC */
1462 #ifdef HPPA
1463                 if (r28 && (unsigned) -r28 < nerrnos) {
1464                         tcp->u_rval = -1;
1465                         u_error = -r28;
1466                 }
1467                 else {
1468                         tcp->u_rval = r28;
1469                         u_error = 0;
1470                 }
1471 #else
1472 #ifdef SH
1473                /* interpret R0 as return value or error number */
1474                if (r0 && (unsigned) -r0 < nerrnos) {
1475                        tcp->u_rval = -1;
1476                        u_error = -r0;
1477                }
1478                else {
1479                        tcp->u_rval = r0;
1480                        u_error = 0;
1481                }
1482 #else
1483 #ifdef SHMEDIA
1484                 /* interpret result as return value or error number */
1485                 if (r9 && (unsigned) -r9 < nerrnos) {
1486                         tcp->u_rval = -1;
1487                         u_error = -r9;
1488                 }
1489                 else {
1490                         tcp->u_rval = r9;
1491                         u_error = 0;
1492                 }
1493 #endif /* SHMEDIA */
1494 #endif /* SH */
1495 #endif /* HPPA */
1496 #endif /* SPARC */
1497 #endif /* ALPHA */
1498 #endif /* ARM */
1499 #endif /* M68K */
1500 #endif /* POWERPC */
1501 #endif /* MIPS */
1502 #endif /* IA64 */
1503 #endif /* X86_64 */
1504 #endif /* I386 */
1505 #endif /* S390 || S390X */
1506 #endif /* LINUX */
1507 #ifdef SUNOS4
1508                 /* get error code from user struct */
1509                 if (upeek(pid, uoff(u_error), &u_error) < 0)
1510                         return -1;
1511                 u_error >>= 24; /* u_error is a char */
1512
1513                 /* get system call return value */
1514                 if (upeek(pid, uoff(u_rval1), &tcp->u_rval) < 0)
1515                         return -1;
1516 #endif /* SUNOS4 */
1517 #ifdef SVR4
1518 #ifdef SPARC
1519                 /* Judicious guessing goes a long way. */
1520                 if (tcp->status.pr_reg[R_PSR] & 0x100000) {
1521                         tcp->u_rval = -1;
1522                         u_error = tcp->status.pr_reg[R_O0];
1523                 }
1524                 else {
1525                         tcp->u_rval = tcp->status.pr_reg[R_O0];
1526                         u_error = 0;
1527                 }
1528 #endif /* SPARC */
1529 #ifdef I386
1530                 /* Wanna know how to kill an hour single-stepping? */
1531                 if (tcp->status.PR_REG[EFL] & 0x1) {
1532                         tcp->u_rval = -1;
1533                         u_error = tcp->status.PR_REG[EAX];
1534                 }
1535                 else {
1536                         tcp->u_rval = tcp->status.PR_REG[EAX];
1537 #ifdef HAVE_LONG_LONG
1538                         tcp->u_lrval =
1539                                 ((unsigned long long) tcp->status.PR_REG[EDX] << 32) +
1540                                 tcp->status.PR_REG[EAX];
1541 #endif
1542                         u_error = 0;
1543                 }
1544 #endif /* I386 */
1545 #ifdef X86_64
1546                 /* Wanna know how to kill an hour single-stepping? */
1547                 if (tcp->status.PR_REG[EFLAGS] & 0x1) {
1548                         tcp->u_rval = -1;
1549                         u_error = tcp->status.PR_REG[RAX];
1550                 }
1551                 else {
1552                         tcp->u_rval = tcp->status.PR_REG[RAX];
1553                         u_error = 0;
1554                 }
1555 #endif /* X86_64 */
1556 #ifdef MIPS
1557                 if (tcp->status.pr_reg[CTX_A3]) {
1558                         tcp->u_rval = -1;
1559                         u_error = tcp->status.pr_reg[CTX_V0];
1560                 }
1561                 else {
1562                         tcp->u_rval = tcp->status.pr_reg[CTX_V0];
1563                         u_error = 0;
1564                 }
1565 #endif /* MIPS */
1566 #endif /* SVR4 */
1567 #ifdef FREEBSD
1568                 if (regs.r_eflags & PSL_C) {
1569                         tcp->u_rval = -1;
1570                         u_error = regs.r_eax;
1571                 } else {
1572                         tcp->u_rval = regs.r_eax;
1573                         tcp->u_lrval =
1574                           ((unsigned long long) regs.r_edx << 32) +  regs.r_eax;
1575                         u_error = 0;
1576                 }
1577 #endif /* FREEBSD */
1578         tcp->u_error = u_error;
1579         return 1;
1580 }
1581
1582 int
1583 force_result(tcp, error, rval)
1584         struct tcb *tcp;
1585         int error;
1586         long rval;
1587 {
1588 #ifdef LINUX
1589 #if defined(S390) || defined(S390X)
1590         gpr2 = error ? -error : rval;
1591         if (upeek(tcp->pid, PT_GPR2, &gpr2) < 0)
1592                 return -1;
1593         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)PT_GPR2, gpr2) < 0)
1594                 return -1;
1595 #else /* !S390 && !S390X */
1596 #ifdef I386
1597         eax = error ? -error : rval;
1598         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(EAX * 4), eax) < 0)
1599                 return -1;
1600 #else /* !I386 */
1601 #ifdef X86_64
1602         rax = error ? -error : rval;
1603         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(RAX * 4), rax) < 0)
1604                 return -1;
1605 #else
1606 #ifdef IA64
1607         if (ia32) {
1608                 r8 = error ? -error : rval;
1609                 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R8), r8) < 0)
1610                         return -1;
1611         }
1612         else {
1613                 if (error) {
1614                         r8 = error;
1615                         r10 = -1;
1616                 }
1617                 else {
1618                         r8 = rval;
1619                         r10 = 0;
1620                 }
1621                 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R8), r8) < 0 ||
1622                     ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R10), r10) < 0)
1623                         return -1;
1624         }
1625 #else /* !IA64 */
1626 #ifdef MIPS
1627         if (error) {
1628                 r2 = error;
1629                 a3 = -1;
1630         }
1631         else {
1632                 r2 = rval;
1633                 a3 = 0;
1634         }
1635         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), a3) < 0 ||
1636             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_V0), r2) < 0)
1637                 return -1;
1638 #else
1639 #ifdef POWERPC
1640         if (upeek(tcp->pid, sizeof(unsigned long)*PT_CCR, &flags) < 0)
1641                 return -1;
1642         if (error) {
1643                 flags |= SO_MASK;
1644                 result = error;
1645         }
1646         else {
1647                 flags &= ~SO_MASK;
1648                 result = rval;
1649         }
1650         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(sizeof(unsigned long)*PT_CCR), flags) < 0 ||
1651             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(sizeof(unsigned long)*PT_R3), result) < 0)
1652                 return -1;
1653 #else /* !POWERPC */
1654 #ifdef M68K
1655         d0 = error ? -error : rval;
1656         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_D0), d0) < 0)
1657                 return -1;
1658 #else /* !M68K */
1659 #ifdef ARM
1660         r0 = error ? -error : rval;
1661         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*0), r0) < 0)
1662                 return -1;
1663 #else /* !ARM */
1664 #ifdef ALPHA
1665         if (error) {
1666                 a3 = -1;
1667                 r0 = error;
1668         }
1669         else {
1670                 a3 = 0;
1671                 r0 = rval;
1672         }
1673         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), a3) < 0 ||
1674             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_R0), r0) < 0)
1675                 return -1;
1676 #else /* !ALPHA */
1677 #ifdef SPARC
1678         if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0)
1679                 return -1;
1680         if (error) {
1681                 regs.r_psr |= PSR_C;
1682                 regs.r_o0 = error;
1683         }
1684         else {
1685                 regs.r_psr &= ~PSR_C;
1686                 regs.r_o0 = rval;
1687         }
1688         if (ptrace(PTRACE_SETREGS, tcp->pid, (char *)&regs, 0) < 0)
1689                 return -1;
1690 #else /* !SPARC */
1691 #ifdef HPPA
1692         r28 = error ? -error : rval;
1693         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GR28), r28) < 0)
1694                 return -1;
1695 #else
1696 #ifdef SH
1697         r0 = error ? -error : rval;
1698         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*REG_REG0), r0) < 0)
1699                 return -1;
1700 #else
1701 #ifdef SHMEDIA
1702         r9 = error ? -error : rval;
1703         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)REG_GENERAL(9), r9) < 0)
1704                 return -1;
1705 #endif /* SHMEDIA */
1706 #endif /* SH */
1707 #endif /* HPPA */
1708 #endif /* SPARC */
1709 #endif /* ALPHA */
1710 #endif /* ARM */
1711 #endif /* M68K */
1712 #endif /* POWERPC */
1713 #endif /* MIPS */
1714 #endif /* IA64 */
1715 #endif /* X86_64 */
1716 #endif /* I386 */
1717 #endif /* S390 || S390X */
1718 #endif /* LINUX */
1719 #ifdef SUNOS4
1720         if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)uoff(u_error),
1721                    error << 24) < 0 ||
1722             ptrace(PTRACE_POKEUSER, tcp->pid, (char*)uoff(u_rval1), rval) < 0)
1723                 return -1;
1724 #endif /* SUNOS4 */
1725 #ifdef SVR4
1726         /* XXX no clue */
1727         return -1;
1728 #endif /* SVR4 */
1729 #ifdef FREEBSD
1730         if (pread(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1731                 perror("pread");
1732                 return -1;
1733         }
1734         if (error) {
1735                 regs.r_eflags |= PSL_C;
1736                 regs.r_eax = error;
1737         }
1738         else {
1739                 regs.r_eflags &= ~PSL_C;
1740                 regs.r_eax = rval;
1741         }
1742         if (pwrite(tcp->pfd_reg, &regs, sizeof(regs), 0) < 0) {
1743                 perror("pwrite");
1744                 return -1;
1745         }
1746 #endif /* FREEBSD */
1747
1748         /* All branches reach here on success (only).  */
1749         tcp->u_error = error;
1750         tcp->u_rval = rval;
1751         return 0;
1752 }
1753
1754 int syscall_enter(tcp)
1755 struct tcb *tcp;
1756 {
1757 #ifndef USE_PROCFS
1758         int pid = tcp->pid;
1759 #endif /* !USE_PROCFS */
1760 #ifdef LINUX
1761 #if defined(S390) || defined(S390X)
1762         {
1763                 int i;
1764                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1765                         tcp->u_nargs = sysent[tcp->scno].nargs;
1766                 else
1767                         tcp->u_nargs = MAX_ARGS;
1768                 for (i = 0; i < tcp->u_nargs; i++) {
1769                         if (upeek(pid,i==0 ? PT_ORIGGPR2:PT_GPR2+i*sizeof(long), &tcp->u_arg[i]) < 0)
1770                                 return -1;
1771                 }
1772         }
1773 #elif defined (ALPHA)
1774         {
1775                 int i;
1776                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1777                         tcp->u_nargs = sysent[tcp->scno].nargs;
1778                 else
1779                         tcp->u_nargs = MAX_ARGS;
1780                 for (i = 0; i < tcp->u_nargs; i++) {
1781                         /* WTA: if scno is out-of-bounds this will bomb. Add range-check
1782                          * for scno somewhere above here!
1783                          */
1784                         if (upeek(pid, REG_A0+i, &tcp->u_arg[i]) < 0)
1785                                 return -1;
1786                 }
1787         }
1788 #elif defined (IA64)
1789         {
1790                 if (!ia32) {
1791                         unsigned long *out0, *rbs_end, cfm, sof, sol, i;
1792                         /* be backwards compatible with kernel < 2.4.4... */
1793 #                       ifndef PT_RBS_END
1794 #                         define PT_RBS_END     PT_AR_BSP
1795 #                       endif
1796
1797                         if (upeek(pid, PT_RBS_END, (long *) &rbs_end) < 0)
1798                                 return -1;
1799                         if (upeek(pid, PT_CFM, (long *) &cfm) < 0)
1800                                 return -1;
1801
1802                         sof = (cfm >> 0) & 0x7f;
1803                         sol = (cfm >> 7) & 0x7f;
1804                         out0 = ia64_rse_skip_regs(rbs_end, -sof + sol);
1805
1806                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1807                             && sysent[tcp->scno].nargs != -1)
1808                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1809                         else
1810                                 tcp->u_nargs = MAX_ARGS;
1811                         for (i = 0; i < tcp->u_nargs; ++i) {
1812                                 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
1813                                            sizeof(long), (char *) &tcp->u_arg[i]) < 0)
1814                                         return -1;
1815                         }
1816                 } else {
1817                         int i;
1818
1819                         if (/* EBX = out0 */
1820                             upeek(pid, PT_R11, (long *) &tcp->u_arg[0]) < 0
1821                             /* ECX = out1 */
1822                             || upeek(pid, PT_R9,  (long *) &tcp->u_arg[1]) < 0
1823                             /* EDX = out2 */
1824                             || upeek(pid, PT_R10, (long *) &tcp->u_arg[2]) < 0
1825                             /* ESI = out3 */
1826                             || upeek(pid, PT_R14, (long *) &tcp->u_arg[3]) < 0
1827                             /* EDI = out4 */
1828                             || upeek(pid, PT_R15, (long *) &tcp->u_arg[4]) < 0
1829                             /* EBP = out5 */
1830                             || upeek(pid, PT_R13, (long *) &tcp->u_arg[5]) < 0)
1831                                 return -1;
1832
1833                         for (i = 0; i < 6; ++i)
1834                                 /* truncate away IVE sign-extension */
1835                                 tcp->u_arg[i] &= 0xffffffff;
1836
1837                         if (tcp->scno >= 0 && tcp->scno < nsyscalls
1838                             && sysent[tcp->scno].nargs != -1)
1839                                 tcp->u_nargs = sysent[tcp->scno].nargs;
1840                         else
1841                                 tcp->u_nargs = 5;
1842                 }
1843         }
1844 #elif defined (MIPS)
1845         {
1846                 long sp;
1847                 int i, nargs;
1848
1849                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1850                         nargs = tcp->u_nargs = sysent[tcp->scno].nargs;
1851                 else
1852                         nargs = tcp->u_nargs = MAX_ARGS;
1853                 if(nargs > 4) {
1854                         if(upeek(pid, REG_SP, &sp) < 0)
1855                                 return -1;
1856                         for(i = 0; i < 4; i++) {
1857                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i])<0)
1858                                         return -1;
1859                         }
1860                         umoven(tcp, sp+16, (nargs-4) * sizeof(tcp->u_arg[0]),
1861                                (char *)(tcp->u_arg + 4));
1862                 } else {
1863                         for(i = 0; i < nargs; i++) {
1864                                 if (upeek(pid, REG_A0 + i, &tcp->u_arg[i]) < 0)
1865                                         return -1;
1866                         }
1867                 }
1868         }
1869 #elif defined (POWERPC)
1870 #ifndef PT_ORIG_R3
1871 #define PT_ORIG_R3 34
1872 #endif
1873         {
1874                 int i;
1875                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1876                         tcp->u_nargs = sysent[tcp->scno].nargs;
1877                 else
1878                         tcp->u_nargs = MAX_ARGS;
1879                 for (i = 0; i < tcp->u_nargs; i++) {
1880                         if (upeek(pid, (i==0) ?
1881                                 (sizeof(unsigned long)*PT_ORIG_R3) :
1882                                 ((i+PT_R3)*sizeof(unsigned long)),
1883                                         &tcp->u_arg[i]) < 0)
1884                                 return -1;
1885                 }
1886         }
1887 #elif defined (SPARC)
1888         {
1889                 int i;
1890
1891                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1892                         tcp->u_nargs = sysent[tcp->scno].nargs;
1893                 else
1894                         tcp->u_nargs = MAX_ARGS;
1895                 for (i = 0; i < tcp->u_nargs; i++)
1896                         tcp->u_arg[i] = *((&regs.r_o0) + i);
1897         }
1898 #elif defined (HPPA)
1899         {
1900                 int i;
1901
1902                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1903                         tcp->u_nargs = sysent[tcp->scno].nargs;
1904                 else
1905                         tcp->u_nargs = MAX_ARGS;
1906                 for (i = 0; i < tcp->u_nargs; i++) {
1907                         if (upeek(pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
1908                                 return -1;
1909                 }
1910         }
1911 #elif defined(ARM)
1912         {
1913                 int i;
1914
1915                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1916                         tcp->u_nargs = sysent[tcp->scno].nargs;
1917                 else
1918                         tcp->u_nargs = MAX_ARGS;
1919                 for (i = 0; i < tcp->u_nargs; i++)
1920                         tcp->u_arg[i] = regs.uregs[i];
1921         }
1922 #elif defined(SH)
1923        {
1924                int i;
1925                static int syscall_regs[] = {
1926                    REG_REG0+4, REG_REG0+5, REG_REG0+6, REG_REG0+7,
1927                    REG_REG0, REG_REG0+1, REG_REG0+2
1928                    };
1929
1930                tcp->u_nargs = sysent[tcp->scno].nargs;
1931                for (i = 0; i < tcp->u_nargs; i++) {
1932                        if (upeek(pid, 4*syscall_regs[i], &tcp->u_arg[i]) < 0)
1933                                return -1;
1934                }
1935         }
1936 #elif defined(SHMEDIA)
1937         {
1938                 int i;
1939                 /* Registers used by SH5 Linux system calls for parameters */
1940                 static int syscall_regs[] = { 2, 3, 4, 5, 6, 7 };
1941
1942                 /*
1943                  * TODO: should also check that the number of arguments encoded
1944                  *       in the trap number matches the number strace expects.
1945                  */
1946                 /*
1947                     assert(sysent[tcp->scno].nargs <
1948                         sizeof(syscall_regs)/sizeof(syscall_regs[0]));
1949                  */
1950
1951                 tcp->u_nargs = sysent[tcp->scno].nargs;
1952                 for (i = 0; i < tcp->u_nargs; i++) {
1953                         if (upeek(pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
1954                                 return -1;
1955                 }
1956         }
1957
1958 #elif defined(X86_64)
1959         {
1960                 int i;
1961                 static int argreg[SUPPORTED_PERSONALITIES][MAX_ARGS] = {
1962                         {RDI,RSI,RDX,R10,R8,R9},        /* x86-64 ABI */
1963                         {RBX,RCX,RDX,RDX,RSI,RDI,RBP}   /* i386 ABI */
1964                 };
1965
1966                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1967                         tcp->u_nargs = sysent[tcp->scno].nargs;
1968                 else
1969                         tcp->u_nargs = MAX_ARGS;
1970                 for (i = 0; i < tcp->u_nargs; i++) {
1971                         if (upeek(pid, argreg[current_personality][i]*8, &tcp->u_arg[i]) < 0)
1972                                 return -1;
1973                 }
1974         }
1975 #else /* Other architecture (like i386) (32bits specific) */
1976         {
1977                 int i;
1978                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1979                         tcp->u_nargs = sysent[tcp->scno].nargs;
1980                 else
1981                         tcp->u_nargs = MAX_ARGS;
1982                 for (i = 0; i < tcp->u_nargs; i++) {
1983                         if (upeek(pid, i*4, &tcp->u_arg[i]) < 0)
1984                                 return -1;
1985                 }
1986         }
1987 #endif
1988 #endif /* LINUX */
1989 #ifdef SUNOS4
1990         {
1991                 int i;
1992                 if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
1993                         tcp->u_nargs = sysent[tcp->scno].nargs;
1994                 else
1995                         tcp->u_nargs = MAX_ARGS;
1996                 for (i = 0; i < tcp->u_nargs; i++) {
1997                         struct user *u;
1998
1999                         if (upeek(pid, uoff(u_arg[0]) +
2000                             (i*sizeof(u->u_arg[0])), &tcp->u_arg[i]) < 0)
2001                                 return -1;
2002                 }
2003         }
2004 #endif /* SUNOS4 */
2005 #ifdef SVR4
2006 #ifdef MIPS
2007         /*
2008          * SGI is broken: even though it has pr_sysarg, it doesn't
2009          * set them on system call entry.  Get a clue.
2010          */
2011         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2012                 tcp->u_nargs = sysent[tcp->scno].nargs;
2013         else
2014                 tcp->u_nargs = tcp->status.pr_nsysarg;
2015         if (tcp->u_nargs > 4) {
2016                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
2017                         4*sizeof(tcp->u_arg[0]));
2018                 umoven(tcp, tcp->status.pr_reg[CTX_SP] + 16,
2019                         (tcp->u_nargs - 4)*sizeof(tcp->u_arg[0]), (char *) (tcp->u_arg + 4));
2020         }
2021         else {
2022                 memcpy(tcp->u_arg, &tcp->status.pr_reg[CTX_A0],
2023                         tcp->u_nargs*sizeof(tcp->u_arg[0]));
2024         }
2025 #elif UNIXWARE >= 2
2026         /*
2027          * Like SGI, UnixWare doesn't set pr_sysarg until system call exit
2028          */
2029         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2030                 tcp->u_nargs = sysent[tcp->scno].nargs;
2031         else
2032                 tcp->u_nargs = tcp->status.pr_lwp.pr_nsysarg;
2033         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
2034                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
2035 #elif defined (HAVE_PR_SYSCALL)
2036         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2037                 tcp->u_nargs = sysent[tcp->scno].nargs;
2038         else
2039                 tcp->u_nargs = tcp->status.pr_nsysarg;
2040         {
2041                 int i;
2042                 for (i = 0; i < tcp->u_nargs; i++)
2043                         tcp->u_arg[i] = tcp->status.pr_sysarg[i];
2044         }
2045 #elif defined (I386)
2046         if (tcp->scno >= 0 && tcp->scno < nsyscalls && sysent[tcp->scno].nargs != -1)
2047                 tcp->u_nargs = sysent[tcp->scno].nargs;
2048         else
2049                 tcp->u_nargs = 5;
2050         umoven(tcp, tcp->status.PR_REG[UESP] + 4,
2051                 tcp->u_nargs*sizeof(tcp->u_arg[0]), (char *) tcp->u_arg);
2052 #else
2053         I DONT KNOW WHAT TO DO
2054 #endif /* !HAVE_PR_SYSCALL */
2055 #endif /* SVR4 */
2056 #ifdef FREEBSD
2057         if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
2058             sysent[tcp->scno].nargs > tcp->status.val)
2059                 tcp->u_nargs = sysent[tcp->scno].nargs;
2060         else
2061                 tcp->u_nargs = tcp->status.val;
2062         if (tcp->u_nargs < 0)
2063                 tcp->u_nargs = 0;
2064         if (tcp->u_nargs > MAX_ARGS)
2065                 tcp->u_nargs = MAX_ARGS;
2066         switch(regs.r_eax) {
2067         case SYS___syscall:
2068                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2069                       regs.r_esp + sizeof(int) + sizeof(quad_t));
2070           break;
2071         case SYS_syscall:
2072                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2073                       regs.r_esp + 2 * sizeof(int));
2074           break;
2075         default:
2076                 pread(tcp->pfd, &tcp->u_arg, tcp->u_nargs * sizeof(unsigned long),
2077                       regs.r_esp + sizeof(int));
2078           break;
2079         }
2080 #endif /* FREEBSD */
2081         return 1;
2082 }
2083
2084 int
2085 trace_syscall(tcp)
2086 struct tcb *tcp;
2087 {
2088         int sys_res;
2089         struct timeval tv;
2090         int res;
2091
2092         /* Measure the exit time as early as possible to avoid errors. */
2093         if (dtime && (tcp->flags & TCB_INSYSCALL))
2094                 gettimeofday(&tv, NULL);
2095
2096         res = get_scno(tcp);
2097         if (res != 1)
2098                 return res;
2099
2100         res = syscall_fixup(tcp);
2101         if (res != 1)
2102                 return res;
2103
2104         if (tcp->flags & TCB_INSYSCALL) {
2105                 long u_error;
2106                 res = get_error(tcp);
2107                 if (res != 1)
2108                         return res;
2109
2110                 internal_syscall(tcp);
2111                 if (tcp->scno >= 0 && tcp->scno < nsyscalls &&
2112                     !(qual_flags[tcp->scno] & QUAL_TRACE)) {
2113                         tcp->flags &= ~TCB_INSYSCALL;
2114                         return 0;
2115                 }
2116
2117                 if (tcp->flags & TCB_REPRINT) {
2118                         printleader(tcp);
2119                         tprintf("<... ");
2120                         if (tcp->scno >= nsyscalls || tcp->scno < 0)
2121                                 tprintf("syscall_%lu", tcp->scno);
2122                         else
2123                                 tprintf("%s", sysent[tcp->scno].sys_name);
2124                         tprintf(" resumed> ");
2125                 }
2126
2127                 if (cflag && tcp->scno < nsyscalls && tcp->scno >= 0) {
2128                         call_count[tcp->scno]++;
2129                         if (tcp->u_error)
2130                                 error_count[tcp->scno]++;
2131                         tv_sub(&tv, &tv, &tcp->etime);
2132 #ifdef LINUX
2133                         if (tv_cmp(&tv, &tcp->dtime) > 0) {
2134                                 static struct timeval one_tick =
2135                                         { 0, 1000000 / HZ };
2136
2137                                 if (tv_nz(&tcp->dtime))
2138                                         tv = tcp->dtime;
2139                                 else if (tv_cmp(&tv, &one_tick) > 0) {
2140                                         if (tv_cmp(&shortest, &one_tick) < 0)
2141                                                 tv = shortest;
2142                                         else
2143                                                 tv = one_tick;
2144                                 }
2145                         }
2146 #endif /* LINUX */
2147                         if (tv_cmp(&tv, &shortest) < 0)
2148                                 shortest = tv;
2149                         tv_add(&tv_count[tcp->scno],
2150                                 &tv_count[tcp->scno], &tv);
2151                         tcp->flags &= ~TCB_INSYSCALL;
2152                         return 0;
2153                 }
2154
2155                 if (tcp->scno >= nsyscalls || tcp->scno < 0
2156                     || (qual_flags[tcp->scno] & QUAL_RAW))
2157                         sys_res = printargs(tcp);
2158                 else {
2159                         if (not_failing_only && tcp->u_error)
2160                                 return 0;       /* ignore failed syscalls */
2161                         sys_res = (*sysent[tcp->scno].sys_func)(tcp);
2162                 }
2163                 u_error = tcp->u_error;
2164                 tprintf(") ");
2165                 tabto(acolumn);
2166                 if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
2167                     qual_flags[tcp->scno] & QUAL_RAW) {
2168                         if (u_error)
2169                                 tprintf("= -1 (errno %ld)", u_error);
2170                         else
2171                                 tprintf("= %#lx", tcp->u_rval);
2172                 }
2173                 else if (!(sys_res & RVAL_NONE) && u_error) {
2174                         switch (u_error) {
2175 #ifdef LINUX
2176                         case ERESTARTSYS:
2177                                 tprintf("= ? ERESTARTSYS (To be restarted)");
2178                                 break;
2179                         case ERESTARTNOINTR:
2180                                 tprintf("= ? ERESTARTNOINTR (To be restarted)");
2181                                 break;
2182                         case ERESTARTNOHAND:
2183                                 tprintf("= ? ERESTARTNOHAND (To be restarted)");
2184                                 break;
2185 #endif /* LINUX */
2186                         default:
2187                                 tprintf("= -1 ");
2188                                 if (u_error < 0)
2189                                         tprintf("E??? (errno %ld)", u_error);
2190                                 else if (u_error < nerrnos)
2191                                         tprintf("%s (%s)", errnoent[u_error],
2192                                                 strerror(u_error));
2193                                 else
2194                                         tprintf("ERRNO_%ld (%s)", u_error,
2195                                                 strerror(u_error));
2196                                 break;
2197                         }
2198                 }
2199                 else {
2200                         if (sys_res & RVAL_NONE)
2201                                 tprintf("= ?");
2202                         else {
2203                                 switch (sys_res & RVAL_MASK) {
2204                                 case RVAL_HEX:
2205                                         tprintf("= %#lx", tcp->u_rval);
2206                                         break;
2207                                 case RVAL_OCTAL:
2208                                         tprintf("= %#lo", tcp->u_rval);
2209                                         break;
2210                                 case RVAL_UDECIMAL:
2211                                         tprintf("= %lu", tcp->u_rval);
2212                                         break;
2213                                 case RVAL_DECIMAL:
2214                                         tprintf("= %ld", tcp->u_rval);
2215                                         break;
2216 #ifdef HAVE_LONG_LONG
2217                                 case RVAL_LHEX:
2218                                         tprintf("= %#llx", tcp->u_lrval);
2219                                         break;
2220                                 case RVAL_LOCTAL:
2221                                         tprintf("= %#llo", tcp->u_lrval);
2222                                         break;
2223                                 case RVAL_LUDECIMAL:
2224                                         tprintf("= %llu", tcp->u_lrval);
2225                                         break;
2226                                 case RVAL_LDECIMAL:
2227                                         tprintf("= %lld", tcp->u_lrval);
2228                                         break;
2229 #endif
2230                                 default:
2231                                         fprintf(stderr,
2232                                                 "invalid rval format\n");
2233                                         break;
2234                                 }
2235                         }
2236                         if ((sys_res & RVAL_STR) && tcp->auxstr)
2237                                 tprintf(" (%s)", tcp->auxstr);
2238                 }
2239                 if (dtime) {
2240                         tv_sub(&tv, &tv, &tcp->etime);
2241                         tprintf(" <%ld.%06ld>",
2242                                 (long) tv.tv_sec, (long) tv.tv_usec);
2243                 }
2244                 printtrailer(tcp);
2245
2246                 dumpio(tcp);
2247                 if (fflush(tcp->outf) == EOF)
2248                         return -1;
2249                 tcp->flags &= ~TCB_INSYSCALL;
2250                 return 0;
2251         }
2252
2253         /* Entering system call */
2254         res = syscall_enter(tcp);
2255         if (res != 1)
2256                 return res;
2257
2258         switch (tcp->scno + NR_SYSCALL_BASE) {
2259 #ifdef LINUX
2260 #if !defined (ALPHA) && !defined(SPARC) && !defined(MIPS) && !defined(HPPA) && !defined(X86_64)
2261         case SYS_socketcall:
2262                 decode_subcall(tcp, SYS_socket_subcall,
2263                         SYS_socket_nsubcalls, deref_style);
2264                 break;
2265         case SYS_ipc:
2266                 decode_subcall(tcp, SYS_ipc_subcall,
2267                         SYS_ipc_nsubcalls, shift_style);
2268                 break;
2269 #endif /* !ALPHA && !MIPS && !SPARC && !HPPA && !X86_64 */
2270 #ifdef SPARC
2271         case SYS_socketcall:
2272                 sparc_socket_decode (tcp);
2273                 break;
2274 #endif
2275 #endif /* LINUX */
2276 #ifdef SVR4
2277 #ifdef SYS_pgrpsys_subcall
2278         case SYS_pgrpsys:
2279                 decode_subcall(tcp, SYS_pgrpsys_subcall,
2280                         SYS_pgrpsys_nsubcalls, shift_style);
2281                 break;
2282 #endif /* SYS_pgrpsys_subcall */
2283 #ifdef SYS_sigcall_subcall
2284         case SYS_sigcall:
2285                 decode_subcall(tcp, SYS_sigcall_subcall,
2286                         SYS_sigcall_nsubcalls, mask_style);
2287                 break;
2288 #endif /* SYS_sigcall_subcall */
2289         case SYS_msgsys:
2290                 decode_subcall(tcp, SYS_msgsys_subcall,
2291                         SYS_msgsys_nsubcalls, shift_style);
2292                 break;
2293         case SYS_shmsys:
2294                 decode_subcall(tcp, SYS_shmsys_subcall,
2295                         SYS_shmsys_nsubcalls, shift_style);
2296                 break;
2297         case SYS_semsys:
2298                 decode_subcall(tcp, SYS_semsys_subcall,
2299                         SYS_semsys_nsubcalls, shift_style);
2300                 break;
2301 #if 0 /* broken */
2302         case SYS_utssys:
2303                 decode_subcall(tcp, SYS_utssys_subcall,
2304                         SYS_utssys_nsubcalls, shift_style);
2305                 break;
2306 #endif
2307         case SYS_sysfs:
2308                 decode_subcall(tcp, SYS_sysfs_subcall,
2309                         SYS_sysfs_nsubcalls, shift_style);
2310                 break;
2311         case SYS_spcall:
2312                 decode_subcall(tcp, SYS_spcall_subcall,
2313                         SYS_spcall_nsubcalls, shift_style);
2314                 break;
2315 #ifdef SYS_context_subcall
2316         case SYS_context:
2317                 decode_subcall(tcp, SYS_context_subcall,
2318                         SYS_context_nsubcalls, shift_style);
2319                 break;
2320 #endif /* SYS_context_subcall */
2321 #ifdef SYS_door_subcall
2322         case SYS_door:
2323                 decode_subcall(tcp, SYS_door_subcall,
2324                         SYS_door_nsubcalls, door_style);
2325                 break;
2326 #endif /* SYS_door_subcall */
2327 #ifdef SYS_kaio_subcall
2328         case SYS_kaio:
2329                 decode_subcall(tcp, SYS_kaio_subcall,
2330                         SYS_kaio_nsubcalls, shift_style);
2331                 break;
2332 #endif
2333 #endif /* SVR4 */
2334 #ifdef FREEBSD
2335         case SYS_msgsys:
2336         case SYS_shmsys:
2337         case SYS_semsys:
2338                 decode_subcall(tcp, 0, 0, table_style);
2339                 break;
2340 #endif
2341 #ifdef SUNOS4
2342         case SYS_semsys:
2343                 decode_subcall(tcp, SYS_semsys_subcall,
2344                         SYS_semsys_nsubcalls, shift_style);
2345                 break;
2346         case SYS_msgsys:
2347                 decode_subcall(tcp, SYS_msgsys_subcall,
2348                         SYS_msgsys_nsubcalls, shift_style);
2349                 break;
2350         case SYS_shmsys:
2351                 decode_subcall(tcp, SYS_shmsys_subcall,
2352                         SYS_shmsys_nsubcalls, shift_style);
2353                 break;
2354 #endif
2355         }
2356
2357         internal_syscall(tcp);
2358         if (tcp->scno >=0 && tcp->scno < nsyscalls && !(qual_flags[tcp->scno] & QUAL_TRACE)) {
2359                 tcp->flags |= TCB_INSYSCALL;
2360                 return 0;
2361         }
2362
2363         if (cflag) {
2364                 gettimeofday(&tcp->etime, NULL);
2365                 tcp->flags |= TCB_INSYSCALL;
2366                 return 0;
2367         }
2368
2369         printleader(tcp);
2370         tcp->flags &= ~TCB_REPRINT;
2371         tcp_last = tcp;
2372         if (tcp->scno >= nsyscalls || tcp->scno < 0)
2373                 tprintf("syscall_%lu(", tcp->scno);
2374         else
2375                 tprintf("%s(", sysent[tcp->scno].sys_name);
2376         if (tcp->scno >= nsyscalls || tcp->scno < 0 ||
2377             ((qual_flags[tcp->scno] & QUAL_RAW) && tcp->scno != SYS_exit))
2378                 sys_res = printargs(tcp);
2379         else
2380                 sys_res = (*sysent[tcp->scno].sys_func)(tcp);
2381         if (fflush(tcp->outf) == EOF)
2382                 return -1;
2383         tcp->flags |= TCB_INSYSCALL;
2384         /* Measure the entrance time as late as possible to avoid errors. */
2385         if (dtime)
2386                 gettimeofday(&tcp->etime, NULL);
2387         return sys_res;
2388 }
2389
2390 int
2391 printargs(tcp)
2392 struct tcb *tcp;
2393 {
2394         if (entering(tcp)) {
2395                 int i;
2396
2397                 for (i = 0; i < tcp->u_nargs; i++)
2398                         tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
2399         }
2400         return 0;
2401 }
2402
2403 long
2404 getrval2(tcp)
2405 struct tcb *tcp;
2406 {
2407         long val = -1;
2408
2409 #ifdef LINUX
2410 #ifdef SPARC
2411         struct regs regs;
2412         if (ptrace(PTRACE_GETREGS,tcp->pid,(char *)&regs,0) < 0)
2413                 return -1;
2414         val = regs.r_o1;
2415 #elif defined(SH)
2416         if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0)
2417                 return -1;
2418 #endif /* SPARC */
2419 #endif /* LINUX */
2420
2421 #ifdef SUNOS4
2422         if (upeek(tcp->pid, uoff(u_rval2), &val) < 0)
2423                 return -1;
2424 #endif /* SUNOS4 */
2425
2426 #ifdef SVR4
2427 #ifdef SPARC
2428         val = tcp->status.PR_REG[R_O1];
2429 #endif /* SPARC */
2430 #ifdef I386
2431         val = tcp->status.PR_REG[EDX];
2432 #endif /* I386 */
2433 #ifdef X86_64
2434         val = tcp->status.PR_REG[RDX];
2435 #endif /* X86_64 */
2436 #ifdef MIPS
2437         val = tcp->status.PR_REG[CTX_V1];
2438 #endif /* MIPS */
2439 #endif /* SVR4 */
2440 #ifdef FREEBSD
2441         struct reg regs;
2442         pread(tcp->pfd_reg, &regs, sizeof(regs), 0);
2443         val = regs.r_edx;
2444 #endif
2445         return val;
2446 }
2447
2448 /*
2449  * Apparently, indirect system calls have already be converted by ptrace(2),
2450  * so if you see "indir" this program has gone astray.
2451  */
2452 int
2453 sys_indir(tcp)
2454 struct tcb *tcp;
2455 {
2456         int i, scno, nargs;
2457
2458         if (entering(tcp)) {
2459                 if ((scno = tcp->u_arg[0]) > nsyscalls) {
2460                         fprintf(stderr, "Bogus syscall: %u\n", scno);
2461                         return 0;
2462                 }
2463                 nargs = sysent[scno].nargs;
2464                 tprintf("%s", sysent[scno].sys_name);
2465                 for (i = 0; i < nargs; i++)
2466                         tprintf(", %#lx", tcp->u_arg[i+1]);
2467         }
2468         return 0;
2469 }
2470
2471 static int
2472 time_cmp(a, b)
2473 void *a;
2474 void *b;
2475 {
2476         return -tv_cmp(&tv_count[*((int *) a)], &tv_count[*((int *) b)]);
2477 }
2478
2479 static int
2480 syscall_cmp(a, b)
2481 void *a;
2482 void *b;
2483 {
2484         return strcmp(sysent[*((int *) a)].sys_name,
2485                 sysent[*((int *) b)].sys_name);
2486 }
2487
2488 static int
2489 count_cmp(a, b)
2490 void *a;
2491 void *b;
2492 {
2493         int m = call_count[*((int *) a)], n = call_count[*((int *) b)];
2494
2495         return (m < n) ? 1 : (m > n) ? -1 : 0;
2496 }
2497
2498 static int (*sortfun)();
2499 static struct timeval overhead = { -1, -1 };
2500
2501 void
2502 set_sortby(sortby)
2503 char *sortby;
2504 {
2505         if (strcmp(sortby, "time") == 0)
2506                 sortfun = time_cmp;
2507         else if (strcmp(sortby, "calls") == 0)
2508                 sortfun = count_cmp;
2509         else if (strcmp(sortby, "name") == 0)
2510                 sortfun = syscall_cmp;
2511         else if (strcmp(sortby, "nothing") == 0)
2512                 sortfun = NULL;
2513         else {
2514                 fprintf(stderr, "invalid sortby: `%s'\n", sortby);
2515                 exit(1);
2516         }
2517 }
2518
2519 void set_overhead(n)
2520 int n;
2521 {
2522         overhead.tv_sec = n / 1000000;
2523         overhead.tv_usec = n % 1000000;
2524 }
2525
2526 void
2527 call_summary(outf)
2528 FILE *outf;
2529 {
2530         int i, j;
2531         int call_cum, error_cum;
2532         struct timeval tv_cum, dtv;
2533         double percent;
2534         char *dashes = "-------------------------";
2535         char error_str[16];
2536
2537         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
2538         if (overhead.tv_sec == -1) {
2539                 tv_mul(&overhead, &shortest, 8);
2540                 tv_div(&overhead, &overhead, 10);
2541         }
2542         for (i = 0; i < nsyscalls; i++) {
2543                 sorted_count[i] = i;
2544                 if (call_count[i] == 0)
2545                         continue;
2546                 tv_mul(&dtv, &overhead, call_count[i]);
2547                 tv_sub(&tv_count[i], &tv_count[i], &dtv);
2548                 call_cum += call_count[i];
2549                 error_cum += error_count[i];
2550                 tv_add(&tv_cum, &tv_cum, &tv_count[i]);
2551         }
2552         if (sortfun)
2553                 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
2554         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
2555                 "% time", "seconds", "usecs/call",
2556                 "calls", "errors", "syscall");
2557         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2558                 dashes, dashes, dashes, dashes, dashes, dashes);
2559         for (i = 0; i < nsyscalls; i++) {
2560                 j = sorted_count[i];
2561                 if (call_count[j] == 0)
2562                         continue;
2563                 tv_div(&dtv, &tv_count[j], call_count[j]);
2564                 if (error_count[j])
2565                         sprintf(error_str, "%d", error_count[j]);
2566                 else
2567                         error_str[0] = '\0';
2568                 percent = 100.0*tv_float(&tv_count[j])/tv_float(&tv_cum);
2569                 fprintf(outf, "%6.2f %4ld.%06ld %11ld %9d %9.9s %s\n",
2570                         percent, (long) tv_count[j].tv_sec,
2571                         (long) tv_count[j].tv_usec,
2572                         (long) 1000000 * dtv.tv_sec + dtv.tv_usec,
2573                         call_count[j], error_str, sysent[j].sys_name);
2574         }
2575         fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %-16.16s\n",
2576                 dashes, dashes, dashes, dashes, dashes, dashes);
2577         if (error_cum)
2578                 sprintf(error_str, "%d", error_cum);
2579         else
2580                 error_str[0] = '\0';
2581         fprintf(outf, "%6.6s %4ld.%06ld %11.11s %9d %9.9s %s\n",
2582                 "100.00", (long) tv_cum.tv_sec, (long) tv_cum.tv_usec, "",
2583                 call_cum, error_str, "total");
2584 }