syscall.c revision 9459dfb891af6ef376a2a78d4a272b9a396ea484
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 34#include "defs.h" 35#include <sys/user.h> 36#include <sys/param.h> 37 38#ifdef HAVE_SYS_REG_H 39# include <sys/reg.h> 40# ifndef PTRACE_PEEKUSR 41# define PTRACE_PEEKUSR PTRACE_PEEKUSER 42# endif 43#elif defined(HAVE_LINUX_PTRACE_H) 44# undef PTRACE_SYSCALL 45# ifdef HAVE_STRUCT_IA64_FPREG 46# define ia64_fpreg XXX_ia64_fpreg 47# endif 48# ifdef HAVE_STRUCT_PT_ALL_USER_REGS 49# define pt_all_user_regs XXX_pt_all_user_regs 50# endif 51# include <linux/ptrace.h> 52# undef ia64_fpreg 53# undef pt_all_user_regs 54#endif 55 56#if defined(SPARC64) 57# undef PTRACE_GETREGS 58# define PTRACE_GETREGS PTRACE_GETREGS64 59# undef PTRACE_SETREGS 60# define PTRACE_SETREGS PTRACE_SETREGS64 61#endif 62 63#if defined(IA64) 64# include <asm/ptrace_offsets.h> 65# include <asm/rse.h> 66#endif 67 68/* for struct iovec */ 69#include <sys/uio.h> 70/* for NT_PRSTATUS */ 71#ifdef HAVE_ELF_H 72# include <elf.h> 73#endif 74 75#if defined(AARCH64) 76# include <asm/ptrace.h> 77#endif 78 79#if defined(XTENSA) 80# include <asm/ptrace.h> 81#endif 82 83#ifndef NSIG 84# warning: NSIG is not defined, using 32 85# define NSIG 32 86#endif 87#ifdef ARM 88/* Ugh. Is this really correct? ARM has no RT signals?! */ 89# undef NSIG 90# define NSIG 32 91#endif 92 93#include "syscall.h" 94 95/* Define these shorthand notations to simplify the syscallent files. */ 96#define TD TRACE_DESC 97#define TF TRACE_FILE 98#define TI TRACE_IPC 99#define TN TRACE_NETWORK 100#define TP TRACE_PROCESS 101#define TS TRACE_SIGNAL 102#define TM TRACE_MEMORY 103#define NF SYSCALL_NEVER_FAILS 104#define MA MAX_ARGS 105 106const struct_sysent sysent0[] = { 107#include "syscallent.h" 108}; 109 110#if SUPPORTED_PERSONALITIES > 1 111static const struct_sysent sysent1[] = { 112# include "syscallent1.h" 113}; 114#endif 115 116#if SUPPORTED_PERSONALITIES > 2 117static const struct_sysent sysent2[] = { 118# include "syscallent2.h" 119}; 120#endif 121 122/* Now undef them since short defines cause wicked namespace pollution. */ 123#undef TD 124#undef TF 125#undef TI 126#undef TN 127#undef TP 128#undef TS 129#undef TM 130#undef NF 131#undef MA 132 133/* 134 * `ioctlent.h' may be generated from `ioctlent.raw' by the auxiliary 135 * program `ioctlsort', such that the list is sorted by the `code' field. 136 * This has the side-effect of resolving the _IO.. macros into 137 * plain integers, eliminating the need to include here everything 138 * in "/usr/include". 139 */ 140 141const char *const errnoent0[] = { 142#include "errnoent.h" 143}; 144const char *const signalent0[] = { 145#include "signalent.h" 146}; 147const struct_ioctlent ioctlent0[] = { 148#include "ioctlent.h" 149}; 150 151#if SUPPORTED_PERSONALITIES > 1 152static const char *const errnoent1[] = { 153# include "errnoent1.h" 154}; 155static const char *const signalent1[] = { 156# include "signalent1.h" 157}; 158static const struct_ioctlent ioctlent1[] = { 159# include "ioctlent1.h" 160}; 161#endif 162 163#if SUPPORTED_PERSONALITIES > 2 164static const char *const errnoent2[] = { 165# include "errnoent2.h" 166}; 167static const char *const signalent2[] = { 168# include "signalent2.h" 169}; 170static const struct_ioctlent ioctlent2[] = { 171# include "ioctlent2.h" 172}; 173#endif 174 175enum { 176 nsyscalls0 = ARRAY_SIZE(sysent0) 177#if SUPPORTED_PERSONALITIES > 1 178 , nsyscalls1 = ARRAY_SIZE(sysent1) 179# if SUPPORTED_PERSONALITIES > 2 180 , nsyscalls2 = ARRAY_SIZE(sysent2) 181# endif 182#endif 183}; 184 185enum { 186 nerrnos0 = ARRAY_SIZE(errnoent0) 187#if SUPPORTED_PERSONALITIES > 1 188 , nerrnos1 = ARRAY_SIZE(errnoent1) 189# if SUPPORTED_PERSONALITIES > 2 190 , nerrnos2 = ARRAY_SIZE(errnoent2) 191# endif 192#endif 193}; 194 195enum { 196 nsignals0 = ARRAY_SIZE(signalent0) 197#if SUPPORTED_PERSONALITIES > 1 198 , nsignals1 = ARRAY_SIZE(signalent1) 199# if SUPPORTED_PERSONALITIES > 2 200 , nsignals2 = ARRAY_SIZE(signalent2) 201# endif 202#endif 203}; 204 205enum { 206 nioctlents0 = ARRAY_SIZE(ioctlent0) 207#if SUPPORTED_PERSONALITIES > 1 208 , nioctlents1 = ARRAY_SIZE(ioctlent1) 209# if SUPPORTED_PERSONALITIES > 2 210 , nioctlents2 = ARRAY_SIZE(ioctlent2) 211# endif 212#endif 213}; 214 215#if SUPPORTED_PERSONALITIES > 1 216const struct_sysent *sysent = sysent0; 217const char *const *errnoent = errnoent0; 218const char *const *signalent = signalent0; 219const struct_ioctlent *ioctlent = ioctlent0; 220#endif 221unsigned nsyscalls = nsyscalls0; 222unsigned nerrnos = nerrnos0; 223unsigned nsignals = nsignals0; 224unsigned nioctlents = nioctlents0; 225 226unsigned num_quals; 227qualbits_t *qual_vec[SUPPORTED_PERSONALITIES]; 228 229static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = { 230 nsyscalls0, 231#if SUPPORTED_PERSONALITIES > 1 232 nsyscalls1, 233#endif 234#if SUPPORTED_PERSONALITIES > 2 235 nsyscalls2, 236#endif 237}; 238static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = { 239 sysent0, 240#if SUPPORTED_PERSONALITIES > 1 241 sysent1, 242#endif 243#if SUPPORTED_PERSONALITIES > 2 244 sysent2, 245#endif 246}; 247 248enum { 249 MAX_NSYSCALLS1 = (nsyscalls0 250#if SUPPORTED_PERSONALITIES > 1 251 > nsyscalls1 ? nsyscalls0 : nsyscalls1 252#endif 253 ), 254 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1 255#if SUPPORTED_PERSONALITIES > 2 256 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2 257#endif 258 ), 259 MAX_NSYSCALLS = MAX_NSYSCALLS2, 260 /* We are ready for arches with up to 255 signals, 261 * even though the largest known signo is on MIPS and it is 128. 262 * The number of existing syscalls on all arches is 263 * larger that 255 anyway, so it is just a pedantic matter. 264 */ 265 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255 266}; 267 268#if SUPPORTED_PERSONALITIES > 1 269unsigned current_personality; 270 271# ifndef current_wordsize 272unsigned current_wordsize; 273static const int personality_wordsize[SUPPORTED_PERSONALITIES] = { 274 PERSONALITY0_WORDSIZE, 275 PERSONALITY1_WORDSIZE, 276# if SUPPORTED_PERSONALITIES > 2 277 PERSONALITY2_WORDSIZE, 278# endif 279}; 280# endif 281 282void 283set_personality(int personality) 284{ 285 nsyscalls = nsyscall_vec[personality]; 286 sysent = sysent_vec[personality]; 287 288 switch (personality) { 289 case 0: 290 errnoent = errnoent0; 291 nerrnos = nerrnos0; 292 ioctlent = ioctlent0; 293 nioctlents = nioctlents0; 294 signalent = signalent0; 295 nsignals = nsignals0; 296 break; 297 298 case 1: 299 errnoent = errnoent1; 300 nerrnos = nerrnos1; 301 ioctlent = ioctlent1; 302 nioctlents = nioctlents1; 303 signalent = signalent1; 304 nsignals = nsignals1; 305 break; 306 307# if SUPPORTED_PERSONALITIES > 2 308 case 2: 309 errnoent = errnoent2; 310 nerrnos = nerrnos2; 311 ioctlent = ioctlent2; 312 nioctlents = nioctlents2; 313 signalent = signalent2; 314 nsignals = nsignals2; 315 break; 316# endif 317 } 318 319 current_personality = personality; 320# ifndef current_wordsize 321 current_wordsize = personality_wordsize[personality]; 322# endif 323} 324 325static void 326update_personality(struct tcb *tcp, int personality) 327{ 328 if (personality == current_personality) 329 return; 330 set_personality(personality); 331 332 if (personality == tcp->currpers) 333 return; 334 tcp->currpers = personality; 335 336# if defined(POWERPC64) 337 if (!qflag) { 338 static const char *const names[] = {"64 bit", "32 bit"}; 339 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 340 tcp->pid, names[personality]); 341 } 342# elif defined(X86_64) 343 if (!qflag) { 344 static const char *const names[] = {"64 bit", "32 bit", "x32"}; 345 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 346 tcp->pid, names[personality]); 347 } 348# elif defined(X32) 349 if (!qflag) { 350 static const char *const names[] = {"x32", "32 bit"}; 351 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 352 tcp->pid, names[personality]); 353 } 354# elif defined(AARCH64) 355 if (!qflag) { 356 static const char *const names[] = {"32-bit", "AArch64"}; 357 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 358 tcp->pid, names[personality]); 359 } 360# elif defined(TILE) 361 if (!qflag) { 362 static const char *const names[] = {"64-bit", "32-bit"}; 363 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 364 tcp->pid, names[personality]); 365 } 366# endif 367} 368#endif 369 370static int qual_syscall(), qual_signal(), qual_desc(); 371 372static const struct qual_options { 373 int bitflag; 374 const char *option_name; 375 int (*qualify)(const char *, int, int); 376 const char *argument_name; 377} qual_options[] = { 378 { QUAL_TRACE, "trace", qual_syscall, "system call" }, 379 { QUAL_TRACE, "t", qual_syscall, "system call" }, 380 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" }, 381 { QUAL_ABBREV, "a", qual_syscall, "system call" }, 382 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" }, 383 { QUAL_VERBOSE, "v", qual_syscall, "system call" }, 384 { QUAL_RAW, "raw", qual_syscall, "system call" }, 385 { QUAL_RAW, "x", qual_syscall, "system call" }, 386 { QUAL_SIGNAL, "signal", qual_signal, "signal" }, 387 { QUAL_SIGNAL, "signals", qual_signal, "signal" }, 388 { QUAL_SIGNAL, "s", qual_signal, "signal" }, 389 { QUAL_READ, "read", qual_desc, "descriptor" }, 390 { QUAL_READ, "reads", qual_desc, "descriptor" }, 391 { QUAL_READ, "r", qual_desc, "descriptor" }, 392 { QUAL_WRITE, "write", qual_desc, "descriptor" }, 393 { QUAL_WRITE, "writes", qual_desc, "descriptor" }, 394 { QUAL_WRITE, "w", qual_desc, "descriptor" }, 395 { 0, NULL, NULL, NULL }, 396}; 397 398static void 399reallocate_qual(int n) 400{ 401 unsigned p; 402 qualbits_t *qp; 403 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 404 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t)); 405 if (!qp) 406 die_out_of_memory(); 407 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t)); 408 } 409 num_quals = n; 410} 411 412static void 413qualify_one(int n, int bitflag, int not, int pers) 414{ 415 unsigned p; 416 417 if (num_quals <= n) 418 reallocate_qual(n + 1); 419 420 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 421 if (pers == p || pers < 0) { 422 if (not) 423 qual_vec[p][n] &= ~bitflag; 424 else 425 qual_vec[p][n] |= bitflag; 426 } 427 } 428} 429 430static int 431qual_syscall(const char *s, int bitflag, int not) 432{ 433 unsigned p; 434 unsigned i; 435 int rc = -1; 436 437 if (*s >= '0' && *s <= '9') { 438 i = string_to_uint(s); 439 if (i >= MAX_NSYSCALLS) 440 return -1; 441 qualify_one(i, bitflag, not, -1); 442 return 0; 443 } 444 445 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 446 for (i = 0; i < nsyscall_vec[p]; i++) { 447 if (sysent_vec[p][i].sys_name 448 && strcmp(s, sysent_vec[p][i].sys_name) == 0 449 ) { 450 qualify_one(i, bitflag, not, p); 451 rc = 0; 452 } 453 } 454 } 455 456 return rc; 457} 458 459static int 460qual_signal(const char *s, int bitflag, int not) 461{ 462 int i; 463 464 if (*s >= '0' && *s <= '9') { 465 int signo = string_to_uint(s); 466 if (signo < 0 || signo > 255) 467 return -1; 468 qualify_one(signo, bitflag, not, -1); 469 return 0; 470 } 471 if (strncasecmp(s, "SIG", 3) == 0) 472 s += 3; 473 for (i = 0; i <= NSIG; i++) { 474 if (strcasecmp(s, signame(i) + 3) == 0) { 475 qualify_one(i, bitflag, not, -1); 476 return 0; 477 } 478 } 479 return -1; 480} 481 482static int 483qual_desc(const char *s, int bitflag, int not) 484{ 485 if (*s >= '0' && *s <= '9') { 486 int desc = string_to_uint(s); 487 if (desc < 0 || desc > 0x7fff) /* paranoia */ 488 return -1; 489 qualify_one(desc, bitflag, not, -1); 490 return 0; 491 } 492 return -1; 493} 494 495static int 496lookup_class(const char *s) 497{ 498 if (strcmp(s, "file") == 0) 499 return TRACE_FILE; 500 if (strcmp(s, "ipc") == 0) 501 return TRACE_IPC; 502 if (strcmp(s, "network") == 0) 503 return TRACE_NETWORK; 504 if (strcmp(s, "process") == 0) 505 return TRACE_PROCESS; 506 if (strcmp(s, "signal") == 0) 507 return TRACE_SIGNAL; 508 if (strcmp(s, "desc") == 0) 509 return TRACE_DESC; 510 if (strcmp(s, "memory") == 0) 511 return TRACE_MEMORY; 512 return -1; 513} 514 515void 516qualify(const char *s) 517{ 518 const struct qual_options *opt; 519 int not; 520 char *copy; 521 const char *p; 522 int i, n; 523 524 if (num_quals == 0) 525 reallocate_qual(MIN_QUALS); 526 527 opt = &qual_options[0]; 528 for (i = 0; (p = qual_options[i].option_name); i++) { 529 n = strlen(p); 530 if (strncmp(s, p, n) == 0 && s[n] == '=') { 531 opt = &qual_options[i]; 532 s += n + 1; 533 break; 534 } 535 } 536 not = 0; 537 if (*s == '!') { 538 not = 1; 539 s++; 540 } 541 if (strcmp(s, "none") == 0) { 542 not = 1 - not; 543 s = "all"; 544 } 545 if (strcmp(s, "all") == 0) { 546 for (i = 0; i < num_quals; i++) { 547 qualify_one(i, opt->bitflag, not, -1); 548 } 549 return; 550 } 551 for (i = 0; i < num_quals; i++) { 552 qualify_one(i, opt->bitflag, !not, -1); 553 } 554 copy = strdup(s); 555 if (!copy) 556 die_out_of_memory(); 557 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) { 558 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) { 559 unsigned pers; 560 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) { 561 for (i = 0; i < nsyscall_vec[pers]; i++) 562 if (sysent_vec[pers][i].sys_flags & n) 563 qualify_one(i, opt->bitflag, not, pers); 564 } 565 continue; 566 } 567 if (opt->qualify(p, opt->bitflag, not)) { 568 error_msg_and_die("invalid %s '%s'", 569 opt->argument_name, p); 570 } 571 } 572 free(copy); 573 return; 574} 575 576#ifdef SYS_socket_subcall 577static void 578decode_socket_subcall(struct tcb *tcp) 579{ 580 unsigned long addr; 581 unsigned int i, n, size; 582 583 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls) 584 return; 585 586 tcp->scno = SYS_socket_subcall + tcp->u_arg[0]; 587 tcp->qual_flg = qual_flags[tcp->scno]; 588 tcp->s_ent = &sysent[tcp->scno]; 589 addr = tcp->u_arg[1]; 590 size = current_wordsize; 591 n = tcp->s_ent->nargs; 592 for (i = 0; i < n; ++i) { 593 if (size == sizeof(int)) { 594 unsigned int arg; 595 if (umove(tcp, addr, &arg) < 0) 596 arg = 0; 597 tcp->u_arg[i] = arg; 598 } 599 else { 600 unsigned long arg; 601 if (umove(tcp, addr, &arg) < 0) 602 arg = 0; 603 tcp->u_arg[i] = arg; 604 } 605 addr += size; 606 } 607} 608#endif 609 610#ifdef SYS_ipc_subcall 611static void 612decode_ipc_subcall(struct tcb *tcp) 613{ 614 unsigned int i, n; 615 616 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls) 617 return; 618 619 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0]; 620 tcp->qual_flg = qual_flags[tcp->scno]; 621 tcp->s_ent = &sysent[tcp->scno]; 622 n = tcp->s_ent->nargs; 623 for (i = 0; i < n; i++) 624 tcp->u_arg[i] = tcp->u_arg[i + 1]; 625} 626#endif 627 628int 629printargs(struct tcb *tcp) 630{ 631 if (entering(tcp)) { 632 int i; 633 int n = tcp->s_ent->nargs; 634 for (i = 0; i < n; i++) 635 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]); 636 } 637 return 0; 638} 639 640int 641printargs_lu(struct tcb *tcp) 642{ 643 if (entering(tcp)) { 644 int i; 645 int n = tcp->s_ent->nargs; 646 for (i = 0; i < n; i++) 647 tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]); 648 } 649 return 0; 650} 651 652int 653printargs_ld(struct tcb *tcp) 654{ 655 if (entering(tcp)) { 656 int i; 657 int n = tcp->s_ent->nargs; 658 for (i = 0; i < n; i++) 659 tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]); 660 } 661 return 0; 662} 663 664#if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH) 665long 666getrval2(struct tcb *tcp) 667{ 668 long val; 669 670# if defined(SPARC) || defined(SPARC64) 671 val = sparc_regs.u_regs[U_REG_O1]; 672# elif defined(SH) 673 if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0) 674 return -1; 675# elif defined(IA64) 676 if (upeek(tcp->pid, PT_R9, &val) < 0) 677 return -1; 678# endif 679 680 return val; 681} 682#endif 683 684#if defined(I386) 685struct user_regs_struct i386_regs; 686# define ARCH_REGS_FOR_GETREGSET i386_regs 687#elif defined(X86_64) || defined(X32) 688/* 689 * On i386, pt_regs and user_regs_struct are the same, 690 * but on 64 bit x86, user_regs_struct has six more fields: 691 * fs_base, gs_base, ds, es, fs, gs. 692 * PTRACE_GETREGS fills them too, so struct pt_regs would overflow. 693 */ 694struct i386_user_regs_struct { 695 uint32_t ebx; 696 uint32_t ecx; 697 uint32_t edx; 698 uint32_t esi; 699 uint32_t edi; 700 uint32_t ebp; 701 uint32_t eax; 702 uint32_t xds; 703 uint32_t xes; 704 uint32_t xfs; 705 uint32_t xgs; 706 uint32_t orig_eax; 707 uint32_t eip; 708 uint32_t xcs; 709 uint32_t eflags; 710 uint32_t esp; 711 uint32_t xss; 712}; 713static union { 714 struct user_regs_struct x86_64_r; 715 struct i386_user_regs_struct i386_r; 716} x86_regs_union; 717# define x86_64_regs x86_regs_union.x86_64_r 718# define i386_regs x86_regs_union.i386_r 719static struct iovec x86_io = { 720 .iov_base = &x86_regs_union 721}; 722#elif defined(IA64) 723bool ia64_ia32mode = 0; /* not static */ 724static long ia64_r8, ia64_r10; 725#elif defined(POWERPC) 726struct pt_regs ppc_regs; 727#elif defined(M68K) 728static long m68k_d0; 729#elif defined(BFIN) 730static long bfin_r0; 731#elif defined(ARM) 732struct pt_regs arm_regs; /* not static */ 733# define ARCH_REGS_FOR_GETREGSET arm_regs 734#elif defined(AARCH64) 735static union { 736 struct user_pt_regs aarch64_r; 737 struct arm_pt_regs arm_r; 738} arm_regs_union; 739# define aarch64_regs arm_regs_union.aarch64_r 740# define arm_regs arm_regs_union.arm_r 741static struct iovec aarch64_io = { 742 .iov_base = &arm_regs_union 743}; 744#elif defined(ALPHA) 745static long alpha_r0; 746static long alpha_a3; 747#elif defined(AVR32) 748static struct pt_regs avr32_regs; 749#elif defined(SPARC) || defined(SPARC64) 750struct pt_regs sparc_regs; /* not static */ 751#elif defined(LINUX_MIPSN32) 752static long long mips_a3; 753static long long mips_r2; 754#elif defined(MIPS) 755static long mips_a3; 756static long mips_r2; 757#elif defined(S390) || defined(S390X) 758static long s390_gpr2; 759#elif defined(HPPA) 760static long hppa_r28; 761#elif defined(SH) 762static long sh_r0; 763#elif defined(SH64) 764static long sh64_r9; 765#elif defined(CRISV10) || defined(CRISV32) 766static long cris_r10; 767#elif defined(TILE) 768struct pt_regs tile_regs; 769#elif defined(MICROBLAZE) 770static long microblaze_r3; 771#elif defined(OR1K) 772static struct user_regs_struct or1k_regs; 773# define ARCH_REGS_FOR_GETREGSET or1k_regs 774#elif defined(METAG) 775static struct user_gp_regs metag_regs; 776# define ARCH_REGS_FOR_GETREGSET metag_regs 777#elif defined(XTENSA) 778static long xtensa_a2; 779#endif 780 781void 782print_pc(struct tcb *tcp) 783{ 784#define PRINTBADPC tprintf(sizeof(long) == 4 ? "[????????] " : \ 785 sizeof(long) == 8 ? "[????????????????] " : \ 786 NULL /* crash */) 787 if (get_regs_error) { 788 PRINTBADPC; 789 return; 790 } 791#if defined(I386) 792 tprintf("[%08lx] ", i386_regs.eip); 793#elif defined(S390) || defined(S390X) 794 long psw; 795 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) { 796 PRINTBADPC; 797 return; 798 } 799# ifdef S390 800 tprintf("[%08lx] ", psw); 801# elif S390X 802 tprintf("[%016lx] ", psw); 803# endif 804#elif defined(X86_64) || defined(X32) 805 if (x86_io.iov_len == sizeof(i386_regs)) { 806 tprintf("[%08x] ", (unsigned) i386_regs.eip); 807 } else { 808# if defined(X86_64) 809 tprintf("[%016lx] ", (unsigned long) x86_64_regs.rip); 810# elif defined(X32) 811 /* Note: this truncates 64-bit rip to 32 bits */ 812 tprintf("[%08lx] ", (unsigned long) x86_64_regs.rip); 813# endif 814 } 815#elif defined(IA64) 816 long ip; 817 if (upeek(tcp->pid, PT_B0, &ip) < 0) { 818 PRINTBADPC; 819 return; 820 } 821 tprintf("[%08lx] ", ip); 822#elif defined(POWERPC) 823 long pc = ppc_regs.nip; 824# ifdef POWERPC64 825 tprintf("[%016lx] ", pc); 826# else 827 tprintf("[%08lx] ", pc); 828# endif 829#elif defined(M68K) 830 long pc; 831 if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) { 832 tprints("[????????] "); 833 return; 834 } 835 tprintf("[%08lx] ", pc); 836#elif defined(ALPHA) 837 long pc; 838 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 839 tprints("[????????????????] "); 840 return; 841 } 842 tprintf("[%08lx] ", pc); 843#elif defined(SPARC) 844 tprintf("[%08lx] ", sparc_regs.pc); 845#elif defined(SPARC64) 846 tprintf("[%08lx] ", sparc_regs.tpc); 847#elif defined(HPPA) 848 long pc; 849 if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) { 850 tprints("[????????] "); 851 return; 852 } 853 tprintf("[%08lx] ", pc); 854#elif defined(MIPS) 855 long pc; 856 if (upeek(tcp->pid, REG_EPC, &pc) < 0) { 857 tprints("[????????] "); 858 return; 859 } 860 tprintf("[%08lx] ", pc); 861#elif defined(SH) 862 long pc; 863 if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) { 864 tprints("[????????] "); 865 return; 866 } 867 tprintf("[%08lx] ", pc); 868#elif defined(SH64) 869 long pc; 870 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 871 tprints("[????????????????] "); 872 return; 873 } 874 tprintf("[%08lx] ", pc); 875#elif defined(ARM) 876 tprintf("[%08lx] ", arm_regs.ARM_pc); 877#elif defined(AARCH64) 878 /* tprintf("[%016lx] ", aarch64_regs.regs[???]); */ 879#elif defined(AVR32) 880 tprintf("[%08lx] ", avr32_regs.pc); 881#elif defined(BFIN) 882 long pc; 883 if (upeek(tcp->pid, PT_PC, &pc) < 0) { 884 PRINTBADPC; 885 return; 886 } 887 tprintf("[%08lx] ", pc); 888#elif defined(CRISV10) 889 long pc; 890 if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) { 891 PRINTBADPC; 892 return; 893 } 894 tprintf("[%08lx] ", pc); 895#elif defined(CRISV32) 896 long pc; 897 if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) { 898 PRINTBADPC; 899 return; 900 } 901 tprintf("[%08lx] ", pc); 902#elif defined(TILE) 903# ifdef _LP64 904 tprintf("[%016lx] ", (unsigned long) tile_regs.pc); 905# else 906 tprintf("[%08lx] ", (unsigned long) tile_regs.pc); 907# endif 908#elif defined(OR1K) 909 tprintf("[%08lx] ", or1k_regs.pc); 910#elif defined(METAG) 911 tprintf("[%08lx] ", metag_regs.pc); 912#elif defined(XTENSA) 913 long pc; 914 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 915 PRINTBADPC; 916 return; 917 } 918 tprintf("[%08lx] ", pc); 919#endif /* architecture */ 920} 921 922/* Shuffle syscall numbers so that we don't have huge gaps in syscall table. 923 * The shuffling should be reversible: shuffle_scno(shuffle_scno(n)) == n. 924 */ 925#if defined(ARM) /* So far only ARM needs this */ 926static long 927shuffle_scno(unsigned long scno) 928{ 929 if (scno <= ARM_LAST_ORDINARY_SYSCALL) 930 return scno; 931 932 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */ 933 if (scno == 0x000ffff0) 934 return ARM_LAST_ORDINARY_SYSCALL+1; 935 if (scno == ARM_LAST_ORDINARY_SYSCALL+1) 936 return 0x000ffff0; 937 938 /* Is it ARM specific syscall? 939 * Swap with [LAST_ORDINARY+2, LAST_ORDINARY+2 + LAST_SPECIAL] range. 940 */ 941 if (scno >= 0x000f0000 942 && scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL 943 ) { 944 return scno - 0x000f0000 + (ARM_LAST_ORDINARY_SYSCALL+2); 945 } 946 if (/* scno >= ARM_LAST_ORDINARY_SYSCALL+2 - always true */ 1 947 && scno <= (ARM_LAST_ORDINARY_SYSCALL+2) + ARM_LAST_SPECIAL_SYSCALL 948 ) { 949 return scno + 0x000f0000 - (ARM_LAST_ORDINARY_SYSCALL+2); 950 } 951 952 return scno; 953} 954#else 955# define shuffle_scno(scno) ((long)(scno)) 956#endif 957 958static char* 959undefined_scno_name(struct tcb *tcp) 960{ 961 static char buf[sizeof("syscall_%lu") + sizeof(long)*3]; 962 963 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno)); 964 return buf; 965} 966 967#ifdef POWERPC 968/* 969 * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23, 970 * we provide a slow fallback for old kernels. 971 */ 972static int powerpc_getregs_old(pid_t pid) 973{ 974 int i; 975 long r; 976 977 if (iflag) { 978 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip); 979 if (r) 980 goto out; 981 } 982#ifdef POWERPC64 /* else we never use it */ 983 r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr); 984 if (r) 985 goto out; 986#endif 987 r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr); 988 if (r) 989 goto out; 990 r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3); 991 if (r) 992 goto out; 993 for (i = 0; i <= 8; i++) { 994 r = upeek(pid, sizeof(long) * (PT_R0 + i), 995 (long *)&ppc_regs.gpr[i]); 996 if (r) 997 goto out; 998 } 999 out: 1000 return r; 1001} 1002#endif 1003 1004#ifndef get_regs 1005long get_regs_error; 1006 1007#if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS) 1008static void get_regset(pid_t pid) 1009{ 1010/* constant iovec */ 1011# if defined(ARM) \ 1012 || defined(I386) \ 1013 || defined(METAG) \ 1014 || defined(OR1K) 1015 static struct iovec io = { 1016 .iov_base = &ARCH_REGS_FOR_GETREGSET, 1017 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET) 1018 }; 1019 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io); 1020 1021/* variable iovec */ 1022# elif defined(X86_64) || defined(X32) 1023 /* x86_io.iov_base = &x86_regs_union; - already is */ 1024 x86_io.iov_len = sizeof(x86_regs_union); 1025 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &x86_io); 1026# elif defined(AARCH64) 1027 /* aarch64_io.iov_base = &arm_regs_union; - already is */ 1028 aarch64_io.iov_len = sizeof(arm_regs_union); 1029 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &aarch64_io); 1030# else 1031# warning both PTRACE_GETREGSET and NT_PRSTATUS are available but not yet used 1032# endif 1033} 1034#endif /* PTRACE_GETREGSET && NT_PRSTATUS */ 1035 1036void 1037get_regs(pid_t pid) 1038{ 1039/* PTRACE_GETREGSET only */ 1040# if defined(METAG) || defined(OR1K) || defined(X32) || defined(AARCH64) 1041 get_regset(pid); 1042 1043/* PTRACE_GETREGS only */ 1044# elif defined(AVR32) 1045 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &avr32_regs); 1046# elif defined(TILE) 1047 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &tile_regs); 1048# elif defined(SPARC) || defined(SPARC64) 1049 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&sparc_regs, 0); 1050# elif defined(POWERPC) 1051 static bool old_kernel = 0; 1052 if (old_kernel) 1053 goto old; 1054 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, (long) &ppc_regs); 1055 if (get_regs_error && errno == EIO) { 1056 old_kernel = 1; 1057 old: 1058 get_regs_error = powerpc_getregs_old(pid); 1059 } 1060 1061/* try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS */ 1062# else 1063# if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS) 1064 static int getregset_support; 1065 1066 if (getregset_support >= 0) { 1067 get_regset(pid); 1068 if (getregset_support > 0) 1069 return; 1070 if (get_regs_error >= 0) { 1071 getregset_support = 1; 1072 return; 1073 } 1074 if (errno == EPERM || errno == ESRCH) 1075 return; 1076 getregset_support = -1; 1077 } 1078# endif /* PTRACE_GETREGSET && NT_PRSTATUS */ 1079# if defined(ARM) 1080 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &arm_regs); 1081# elif defined(I386) 1082 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &i386_regs); 1083# elif defined(X86_64) 1084 /* Use old method, with unreliable heuristical detection of 32-bitness. */ 1085 x86_io.iov_len = sizeof(x86_64_regs); 1086 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs); 1087 if (!get_regs_error && x86_64_regs.cs == 0x23) { 1088 x86_io.iov_len = sizeof(i386_regs); 1089 /* 1090 * The order is important: i386_regs and x86_64_regs 1091 * are overlaid in memory! 1092 */ 1093 i386_regs.ebx = x86_64_regs.rbx; 1094 i386_regs.ecx = x86_64_regs.rcx; 1095 i386_regs.edx = x86_64_regs.rdx; 1096 i386_regs.esi = x86_64_regs.rsi; 1097 i386_regs.edi = x86_64_regs.rdi; 1098 i386_regs.ebp = x86_64_regs.rbp; 1099 i386_regs.eax = x86_64_regs.rax; 1100 /* i386_regs.xds = x86_64_regs.ds; unused by strace */ 1101 /* i386_regs.xes = x86_64_regs.es; ditto... */ 1102 /* i386_regs.xfs = x86_64_regs.fs; */ 1103 /* i386_regs.xgs = x86_64_regs.gs; */ 1104 i386_regs.orig_eax = x86_64_regs.orig_rax; 1105 i386_regs.eip = x86_64_regs.rip; 1106 /* i386_regs.xcs = x86_64_regs.cs; */ 1107 /* i386_regs.eflags = x86_64_regs.eflags; */ 1108 i386_regs.esp = x86_64_regs.rsp; 1109 /* i386_regs.xss = x86_64_regs.ss; */ 1110 } 1111# else 1112# error unhandled architecture 1113# endif /* ARM || I386 || X86_64 */ 1114# endif 1115} 1116#endif /* !get_regs */ 1117 1118/* Returns: 1119 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1120 * 1: ok, continue in trace_syscall_entering(). 1121 * other: error, trace_syscall_entering() should print error indicator 1122 * ("????" etc) and bail out. 1123 */ 1124static int 1125get_scno(struct tcb *tcp) 1126{ 1127 long scno = 0; 1128 1129#if defined(S390) || defined(S390X) 1130 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1131 return -1; 1132 1133 if (s390_gpr2 != -ENOSYS) { 1134 /* 1135 * Since kernel version 2.5.44 the scno gets passed in gpr2. 1136 */ 1137 scno = s390_gpr2; 1138 } else { 1139 /* 1140 * Old style of "passing" the scno via the SVC instruction. 1141 */ 1142 long psw; 1143 long opcode, offset_reg, tmp; 1144 void *svc_addr; 1145 static const int gpr_offset[16] = { 1146 PT_GPR0, PT_GPR1, PT_ORIGGPR2, PT_GPR3, 1147 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, 1148 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, 1149 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15 1150 }; 1151 1152 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) 1153 return -1; 1154 errno = 0; 1155 opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0); 1156 if (errno) { 1157 perror_msg("peektext(psw-oneword)"); 1158 return -1; 1159 } 1160 1161 /* 1162 * We have to check if the SVC got executed directly or via an 1163 * EXECUTE instruction. In case of EXECUTE it is necessary to do 1164 * instruction decoding to derive the system call number. 1165 * Unfortunately the opcode sizes of EXECUTE and SVC are differently, 1166 * so that this doesn't work if a SVC opcode is part of an EXECUTE 1167 * opcode. Since there is no way to find out the opcode size this 1168 * is the best we can do... 1169 */ 1170 if ((opcode & 0xff00) == 0x0a00) { 1171 /* SVC opcode */ 1172 scno = opcode & 0xff; 1173 } 1174 else { 1175 /* SVC got executed by EXECUTE instruction */ 1176 1177 /* 1178 * Do instruction decoding of EXECUTE. If you really want to 1179 * understand this, read the Principles of Operations. 1180 */ 1181 svc_addr = (void *) (opcode & 0xfff); 1182 1183 tmp = 0; 1184 offset_reg = (opcode & 0x000f0000) >> 16; 1185 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1186 return -1; 1187 svc_addr += tmp; 1188 1189 tmp = 0; 1190 offset_reg = (opcode & 0x0000f000) >> 12; 1191 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1192 return -1; 1193 svc_addr += tmp; 1194 1195 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0); 1196 if (errno) 1197 return -1; 1198# if defined(S390X) 1199 scno >>= 48; 1200# else 1201 scno >>= 16; 1202# endif 1203 tmp = 0; 1204 offset_reg = (opcode & 0x00f00000) >> 20; 1205 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1206 return -1; 1207 1208 scno = (scno | tmp) & 0xff; 1209 } 1210 } 1211#elif defined(POWERPC) 1212 scno = ppc_regs.gpr[0]; 1213# ifdef POWERPC64 1214 int currpers; 1215 1216 /* Check for 64/32 bit mode. */ 1217 /* SF is bit 0 of MSR */ 1218 if ((ppc_regs.msr >> 63) & 1) 1219 currpers = 0; 1220 else 1221 currpers = 1; 1222 update_personality(tcp, currpers); 1223# endif 1224#elif defined(AVR32) 1225 scno = avr32_regs.r8; 1226#elif defined(BFIN) 1227 if (upeek(tcp->pid, PT_ORIG_P0, &scno)) 1228 return -1; 1229#elif defined(I386) 1230 scno = i386_regs.orig_eax; 1231#elif defined(X86_64) || defined(X32) 1232# ifndef __X32_SYSCALL_BIT 1233# define __X32_SYSCALL_BIT 0x40000000 1234# endif 1235 int currpers; 1236# if 1 1237 /* GETREGSET of NT_PRSTATUS tells us regset size, 1238 * which unambiguously detects i386. 1239 * 1240 * Linux kernel distinguishes x86-64 and x32 processes 1241 * solely by looking at __X32_SYSCALL_BIT: 1242 * arch/x86/include/asm/compat.h::is_x32_task(): 1243 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 1244 * return true; 1245 */ 1246 if (x86_io.iov_len == sizeof(i386_regs)) { 1247 scno = i386_regs.orig_eax; 1248 currpers = 1; 1249 } else { 1250 scno = x86_64_regs.orig_rax; 1251 currpers = 0; 1252 if (scno & __X32_SYSCALL_BIT) { 1253 scno -= __X32_SYSCALL_BIT; 1254 currpers = 2; 1255 } 1256 } 1257# elif 0 1258 /* cs = 0x33 for long mode (native 64 bit and x32) 1259 * cs = 0x23 for compatibility mode (32 bit) 1260 * ds = 0x2b for x32 mode (x86-64 in 32 bit) 1261 */ 1262 scno = x86_64_regs.orig_rax; 1263 switch (x86_64_regs.cs) { 1264 case 0x23: currpers = 1; break; 1265 case 0x33: 1266 if (x86_64_regs.ds == 0x2b) { 1267 currpers = 2; 1268 scno &= ~__X32_SYSCALL_BIT; 1269 } else 1270 currpers = 0; 1271 break; 1272 default: 1273 fprintf(stderr, "Unknown value CS=0x%08X while " 1274 "detecting personality of process " 1275 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid); 1276 currpers = current_personality; 1277 break; 1278 } 1279# elif 0 1280 /* This version analyzes the opcode of a syscall instruction. 1281 * (int 0x80 on i386 vs. syscall on x86-64) 1282 * It works, but is too complicated, and strictly speaking, unreliable. 1283 */ 1284 unsigned long call, rip = x86_64_regs.rip; 1285 /* sizeof(syscall) == sizeof(int 0x80) == 2 */ 1286 rip -= 2; 1287 errno = 0; 1288 call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0); 1289 if (errno) 1290 fprintf(stderr, "ptrace_peektext failed: %s\n", 1291 strerror(errno)); 1292 switch (call & 0xffff) { 1293 /* x86-64: syscall = 0x0f 0x05 */ 1294 case 0x050f: currpers = 0; break; 1295 /* i386: int 0x80 = 0xcd 0x80 */ 1296 case 0x80cd: currpers = 1; break; 1297 default: 1298 currpers = current_personality; 1299 fprintf(stderr, 1300 "Unknown syscall opcode (0x%04X) while " 1301 "detecting personality of process " 1302 "PID=%d\n", (int)call, tcp->pid); 1303 break; 1304 } 1305# endif 1306 1307# ifdef X32 1308 /* If we are built for a x32 system, then personality 0 is x32 1309 * (not x86_64), and stracing of x86_64 apps is not supported. 1310 * Stracing of i386 apps is still supported. 1311 */ 1312 if (currpers == 0) { 1313 fprintf(stderr, "syscall_%lu(...) in unsupported " 1314 "64-bit mode of process PID=%d\n", 1315 scno, tcp->pid); 1316 return 0; 1317 } 1318 currpers &= ~2; /* map 2,1 to 0,1 */ 1319# endif 1320 update_personality(tcp, currpers); 1321#elif defined(IA64) 1322# define IA64_PSR_IS ((long)1 << 34) 1323 long psr; 1324 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1325 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1326 if (ia64_ia32mode) { 1327 if (upeek(tcp->pid, PT_R1, &scno) < 0) 1328 return -1; 1329 } else { 1330 if (upeek(tcp->pid, PT_R15, &scno) < 0) 1331 return -1; 1332 } 1333#elif defined(AARCH64) 1334 switch (aarch64_io.iov_len) { 1335 case sizeof(aarch64_regs): 1336 /* We are in 64-bit mode */ 1337 scno = aarch64_regs.regs[8]; 1338 update_personality(tcp, 1); 1339 break; 1340 case sizeof(arm_regs): 1341 /* We are in 32-bit mode */ 1342 /* Note: we don't support OABI, unlike 32-bit ARM build */ 1343 scno = arm_regs.ARM_r7; 1344 update_personality(tcp, 0); 1345 break; 1346 } 1347#elif defined(ARM) 1348 if (arm_regs.ARM_ip != 0) { 1349 /* It is not a syscall entry */ 1350 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid); 1351 tcp->flags |= TCB_INSYSCALL; 1352 return 0; 1353 } 1354 /* Note: we support only 32-bit CPUs, not 26-bit */ 1355 1356# ifndef STRACE_KNOWS_ONLY_EABI 1357# warning STRACE_KNOWS_ONLY_EABI not set, will PTRACE_PEEKTEXT on every syscall (slower tracing) 1358 if (arm_regs.ARM_cpsr & 0x20) 1359 /* Thumb mode */ 1360 goto scno_in_r7; 1361 /* ARM mode */ 1362 /* Check EABI/OABI by examining SVC insn's low 24 bits */ 1363 errno = 0; 1364 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); 1365 if (errno) 1366 return -1; 1367 /* EABI syscall convention? */ 1368 if (scno != 0xef000000) { 1369 /* No, it's OABI */ 1370 if ((scno & 0x0ff00000) != 0x0f900000) { 1371 fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n", 1372 tcp->pid, scno); 1373 return -1; 1374 } 1375 /* Fixup the syscall number */ 1376 scno &= 0x000fffff; 1377 } else { 1378 scno_in_r7: 1379 scno = arm_regs.ARM_r7; 1380 } 1381# else 1382 scno = arm_regs.ARM_r7; 1383# endif 1384 scno = shuffle_scno(scno); 1385#elif defined(M68K) 1386 if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0) 1387 return -1; 1388#elif defined(LINUX_MIPSN32) 1389 unsigned long long regs[38]; 1390 1391 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 1392 return -1; 1393 mips_a3 = regs[REG_A3]; 1394 mips_r2 = regs[REG_V0]; 1395 1396 scno = mips_r2; 1397 if (!SCNO_IN_RANGE(scno)) { 1398 if (mips_a3 == 0 || mips_a3 == -1) { 1399 if (debug_flag) 1400 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1401 return 0; 1402 } 1403 } 1404#elif defined(MIPS) 1405 if (upeek(tcp->pid, REG_A3, &mips_a3) < 0) 1406 return -1; 1407 if (upeek(tcp->pid, REG_V0, &scno) < 0) 1408 return -1; 1409 1410 if (!SCNO_IN_RANGE(scno)) { 1411 if (mips_a3 == 0 || mips_a3 == -1) { 1412 if (debug_flag) 1413 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1414 return 0; 1415 } 1416 } 1417#elif defined(ALPHA) 1418 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1419 return -1; 1420 if (upeek(tcp->pid, REG_R0, &scno) < 0) 1421 return -1; 1422 1423 /* 1424 * Do some sanity checks to figure out if it's 1425 * really a syscall entry 1426 */ 1427 if (!SCNO_IN_RANGE(scno)) { 1428 if (alpha_a3 == 0 || alpha_a3 == -1) { 1429 if (debug_flag) 1430 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno); 1431 return 0; 1432 } 1433 } 1434#elif defined(SPARC) || defined(SPARC64) 1435 /* Disassemble the syscall trap. */ 1436 /* Retrieve the syscall trap instruction. */ 1437 unsigned long trap; 1438 errno = 0; 1439# if defined(SPARC64) 1440 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0); 1441 trap >>= 32; 1442# else 1443 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0); 1444# endif 1445 if (errno) 1446 return -1; 1447 1448 /* Disassemble the trap to see what personality to use. */ 1449 switch (trap) { 1450 case 0x91d02010: 1451 /* Linux/SPARC syscall trap. */ 1452 update_personality(tcp, 0); 1453 break; 1454 case 0x91d0206d: 1455 /* Linux/SPARC64 syscall trap. */ 1456 update_personality(tcp, 2); 1457 break; 1458 case 0x91d02000: 1459 /* SunOS syscall trap. (pers 1) */ 1460 fprintf(stderr, "syscall: SunOS no support\n"); 1461 return -1; 1462 case 0x91d02008: 1463 /* Solaris 2.x syscall trap. (per 2) */ 1464 update_personality(tcp, 1); 1465 break; 1466 case 0x91d02009: 1467 /* NetBSD/FreeBSD syscall trap. */ 1468 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n"); 1469 return -1; 1470 case 0x91d02027: 1471 /* Solaris 2.x gettimeofday */ 1472 update_personality(tcp, 1); 1473 break; 1474 default: 1475# if defined(SPARC64) 1476 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc); 1477# else 1478 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc); 1479# endif 1480 return -1; 1481 } 1482 1483 /* Extract the system call number from the registers. */ 1484 if (trap == 0x91d02027) 1485 scno = 156; 1486 else 1487 scno = sparc_regs.u_regs[U_REG_G1]; 1488 if (scno == 0) { 1489 scno = sparc_regs.u_regs[U_REG_O0]; 1490 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0])); 1491 } 1492#elif defined(HPPA) 1493 if (upeek(tcp->pid, PT_GR20, &scno) < 0) 1494 return -1; 1495#elif defined(SH) 1496 /* 1497 * In the new syscall ABI, the system call number is in R3. 1498 */ 1499 if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0) 1500 return -1; 1501 1502 if (scno < 0) { 1503 /* Odd as it may seem, a glibc bug has been known to cause 1504 glibc to issue bogus negative syscall numbers. So for 1505 our purposes, make strace print what it *should* have been */ 1506 long correct_scno = (scno & 0xff); 1507 if (debug_flag) 1508 fprintf(stderr, 1509 "Detected glibc bug: bogus system call" 1510 " number = %ld, correcting to %ld\n", 1511 scno, 1512 correct_scno); 1513 scno = correct_scno; 1514 } 1515#elif defined(SH64) 1516 if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0) 1517 return -1; 1518 scno &= 0xFFFF; 1519#elif defined(CRISV10) || defined(CRISV32) 1520 if (upeek(tcp->pid, 4*PT_R9, &scno) < 0) 1521 return -1; 1522#elif defined(TILE) 1523 int currpers; 1524 scno = tile_regs.regs[10]; 1525# ifdef __tilepro__ 1526 currpers = 1; 1527# else 1528# ifndef PT_FLAGS_COMPAT 1529# define PT_FLAGS_COMPAT 0x10000 /* from Linux 3.8 on */ 1530# endif 1531 if (tile_regs.flags & PT_FLAGS_COMPAT) 1532 currpers = 1; 1533 else 1534 currpers = 0; 1535# endif 1536 update_personality(tcp, currpers); 1537#elif defined(MICROBLAZE) 1538 if (upeek(tcp->pid, 0, &scno) < 0) 1539 return -1; 1540#elif defined(OR1K) 1541 scno = or1k_regs.gpr[11]; 1542#elif defined(METAG) 1543 scno = metag_regs.dx[0][1]; /* syscall number in D1Re0 (D1.0) */ 1544#elif defined(XTENSA) 1545 if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0) 1546 return -1; 1547#endif 1548 1549 tcp->scno = scno; 1550 if (SCNO_IS_VALID(tcp->scno)) { 1551 tcp->s_ent = &sysent[scno]; 1552 tcp->qual_flg = qual_flags[scno]; 1553 } else { 1554 static const struct_sysent unknown = { 1555 .nargs = MAX_ARGS, 1556 .sys_flags = 0, 1557 .sys_func = printargs, 1558 .sys_name = "unknown", /* not used */ 1559 }; 1560 tcp->s_ent = &unknown; 1561 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS; 1562 } 1563 return 1; 1564} 1565 1566/* Called at each syscall entry. 1567 * Returns: 1568 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1569 * 1: ok, continue in trace_syscall_entering(). 1570 * other: error, trace_syscall_entering() should print error indicator 1571 * ("????" etc) and bail out. 1572 */ 1573static int 1574syscall_fixup_on_sysenter(struct tcb *tcp) 1575{ 1576 /* A common case of "not a syscall entry" is post-execve SIGTRAP */ 1577#if defined(I386) 1578 if (i386_regs.eax != -ENOSYS) { 1579 if (debug_flag) 1580 fprintf(stderr, "not a syscall entry (eax = %ld)\n", i386_regs.eax); 1581 return 0; 1582 } 1583#elif defined(X86_64) || defined(X32) 1584 { 1585 long rax; 1586 if (x86_io.iov_len == sizeof(i386_regs)) { 1587 /* Sign extend from 32 bits */ 1588 rax = (int32_t)i386_regs.eax; 1589 } else { 1590 /* Note: in X32 build, this truncates 64 to 32 bits */ 1591 rax = x86_64_regs.rax; 1592 } 1593 if (rax != -ENOSYS) { 1594 if (debug_flag) 1595 fprintf(stderr, "not a syscall entry (rax = %ld)\n", rax); 1596 return 0; 1597 } 1598 } 1599#elif defined(M68K) 1600 /* TODO? Eliminate upeek's in arches below like we did in x86 */ 1601 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1602 return -1; 1603 if (m68k_d0 != -ENOSYS) { 1604 if (debug_flag) 1605 fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0); 1606 return 0; 1607 } 1608#elif defined(IA64) 1609 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1610 return -1; 1611 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1612 return -1; 1613 if (ia64_ia32mode && ia64_r8 != -ENOSYS) { 1614 if (debug_flag) 1615 fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8); 1616 return 0; 1617 } 1618#elif defined(CRISV10) || defined(CRISV32) 1619 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1620 return -1; 1621 if (cris_r10 != -ENOSYS) { 1622 if (debug_flag) 1623 fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10); 1624 return 0; 1625 } 1626#elif defined(MICROBLAZE) 1627 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1628 return -1; 1629 if (microblaze_r3 != -ENOSYS) { 1630 if (debug_flag) 1631 fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3); 1632 return 0; 1633 } 1634#endif 1635 return 1; 1636} 1637 1638static void 1639internal_fork(struct tcb *tcp) 1640{ 1641#if defined S390 || defined S390X || defined CRISV10 || defined CRISV32 1642# define ARG_FLAGS 1 1643#else 1644# define ARG_FLAGS 0 1645#endif 1646#ifndef CLONE_UNTRACED 1647# define CLONE_UNTRACED 0x00800000 1648#endif 1649 if ((ptrace_setoptions 1650 & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1651 == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1652 return; 1653 1654 if (!followfork) 1655 return; 1656 1657 if (entering(tcp)) { 1658 /* 1659 * We won't see the new child if clone is called with 1660 * CLONE_UNTRACED, so we keep the same logic with that option 1661 * and don't trace it. 1662 */ 1663 if ((tcp->s_ent->sys_func == sys_clone) 1664 && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED) 1665 ) 1666 return; 1667 setbpt(tcp); 1668 } else { 1669 if (tcp->flags & TCB_BPTSET) 1670 clearbpt(tcp); 1671 } 1672} 1673 1674#if defined(TCB_WAITEXECVE) 1675static void 1676internal_exec(struct tcb *tcp) 1677{ 1678 /* Maybe we have post-execve SIGTRAP suppressed? */ 1679 if (ptrace_setoptions & PTRACE_O_TRACEEXEC) 1680 return; /* yes, no need to do anything */ 1681 1682 if (exiting(tcp) && syserror(tcp)) 1683 /* Error in execve, no post-execve SIGTRAP expected */ 1684 tcp->flags &= ~TCB_WAITEXECVE; 1685 else 1686 tcp->flags |= TCB_WAITEXECVE; 1687} 1688#endif 1689 1690static void 1691syscall_fixup_for_fork_exec(struct tcb *tcp) 1692{ 1693 /* 1694 * We must always trace a few critical system calls in order to 1695 * correctly support following forks in the presence of tracing 1696 * qualifiers. 1697 */ 1698 int (*func)(); 1699 1700 func = tcp->s_ent->sys_func; 1701 1702 if ( sys_fork == func 1703 || sys_vfork == func 1704 || sys_clone == func 1705 ) { 1706 internal_fork(tcp); 1707 return; 1708 } 1709 1710#if defined(TCB_WAITEXECVE) 1711 if ( sys_execve == func 1712# if defined(SPARC) || defined(SPARC64) 1713 || sys_execv == func 1714# endif 1715 ) { 1716 internal_exec(tcp); 1717 return; 1718 } 1719#endif 1720} 1721 1722/* Return -1 on error or 1 on success (never 0!) */ 1723static int 1724get_syscall_args(struct tcb *tcp) 1725{ 1726 int i, nargs; 1727 1728 nargs = tcp->s_ent->nargs; 1729 1730#if defined(S390) || defined(S390X) 1731 for (i = 0; i < nargs; ++i) 1732 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0) 1733 return -1; 1734#elif defined(ALPHA) 1735 for (i = 0; i < nargs; ++i) 1736 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1737 return -1; 1738#elif defined(IA64) 1739 if (!ia64_ia32mode) { 1740 unsigned long *out0, cfm, sof, sol; 1741 long rbs_end; 1742 /* be backwards compatible with kernel < 2.4.4... */ 1743# ifndef PT_RBS_END 1744# define PT_RBS_END PT_AR_BSP 1745# endif 1746 1747 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1748 return -1; 1749 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1750 return -1; 1751 1752 sof = (cfm >> 0) & 0x7f; 1753 sol = (cfm >> 7) & 0x7f; 1754 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1755 1756 for (i = 0; i < nargs; ++i) { 1757 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1758 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1759 return -1; 1760 } 1761 } else { 1762 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1763 PT_R9 /* ECX = out1 */, 1764 PT_R10 /* EDX = out2 */, 1765 PT_R14 /* ESI = out3 */, 1766 PT_R15 /* EDI = out4 */, 1767 PT_R13 /* EBP = out5 */}; 1768 1769 for (i = 0; i < nargs; ++i) { 1770 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1771 return -1; 1772 /* truncate away IVE sign-extension */ 1773 tcp->u_arg[i] &= 0xffffffff; 1774 } 1775 } 1776#elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64) 1777 /* N32 and N64 both use up to six registers. */ 1778 unsigned long long regs[38]; 1779 1780 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 1781 return -1; 1782 1783 for (i = 0; i < nargs; ++i) { 1784 tcp->u_arg[i] = regs[REG_A0 + i]; 1785# if defined(LINUX_MIPSN32) 1786 tcp->ext_arg[i] = regs[REG_A0 + i]; 1787# endif 1788 } 1789#elif defined(MIPS) 1790 if (nargs > 4) { 1791 long sp; 1792 1793 if (upeek(tcp->pid, REG_SP, &sp) < 0) 1794 return -1; 1795 for (i = 0; i < 4; ++i) 1796 if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0) 1797 return -1; 1798 umoven(tcp, sp + 16, (nargs - 4) * sizeof(tcp->u_arg[0]), 1799 (char *)(tcp->u_arg + 4)); 1800 } else { 1801 for (i = 0; i < nargs; ++i) 1802 if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0) 1803 return -1; 1804 } 1805#elif defined(POWERPC) 1806 (void)i; 1807 (void)nargs; 1808 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1809 tcp->u_arg[1] = ppc_regs.gpr[4]; 1810 tcp->u_arg[2] = ppc_regs.gpr[5]; 1811 tcp->u_arg[3] = ppc_regs.gpr[6]; 1812 tcp->u_arg[4] = ppc_regs.gpr[7]; 1813 tcp->u_arg[5] = ppc_regs.gpr[8]; 1814#elif defined(SPARC) || defined(SPARC64) 1815 for (i = 0; i < nargs; ++i) 1816 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1817#elif defined(HPPA) 1818 for (i = 0; i < nargs; ++i) 1819 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1820 return -1; 1821#elif defined(ARM) || defined(AARCH64) 1822# if defined(AARCH64) 1823 if (tcp->currpers == 1) 1824 for (i = 0; i < nargs; ++i) 1825 tcp->u_arg[i] = aarch64_regs.regs[i]; 1826 else 1827# endif 1828 for (i = 0; i < nargs; ++i) 1829 tcp->u_arg[i] = arm_regs.uregs[i]; 1830#elif defined(AVR32) 1831 (void)i; 1832 (void)nargs; 1833 tcp->u_arg[0] = avr32_regs.r12; 1834 tcp->u_arg[1] = avr32_regs.r11; 1835 tcp->u_arg[2] = avr32_regs.r10; 1836 tcp->u_arg[3] = avr32_regs.r9; 1837 tcp->u_arg[4] = avr32_regs.r5; 1838 tcp->u_arg[5] = avr32_regs.r3; 1839#elif defined(BFIN) 1840 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1841 1842 for (i = 0; i < nargs; ++i) 1843 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1844 return -1; 1845#elif defined(SH) 1846 static const int syscall_regs[MAX_ARGS] = { 1847 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1848 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1849 }; 1850 1851 for (i = 0; i < nargs; ++i) 1852 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1853 return -1; 1854#elif defined(SH64) 1855 int i; 1856 /* Registers used by SH5 Linux system calls for parameters */ 1857 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1858 1859 for (i = 0; i < nargs; ++i) 1860 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1861 return -1; 1862#elif defined(I386) 1863 (void)i; 1864 (void)nargs; 1865 tcp->u_arg[0] = i386_regs.ebx; 1866 tcp->u_arg[1] = i386_regs.ecx; 1867 tcp->u_arg[2] = i386_regs.edx; 1868 tcp->u_arg[3] = i386_regs.esi; 1869 tcp->u_arg[4] = i386_regs.edi; 1870 tcp->u_arg[5] = i386_regs.ebp; 1871#elif defined(X86_64) || defined(X32) 1872 (void)i; 1873 (void)nargs; 1874 if (x86_io.iov_len != sizeof(i386_regs)) { 1875 /* x86-64 or x32 ABI */ 1876 tcp->u_arg[0] = x86_64_regs.rdi; 1877 tcp->u_arg[1] = x86_64_regs.rsi; 1878 tcp->u_arg[2] = x86_64_regs.rdx; 1879 tcp->u_arg[3] = x86_64_regs.r10; 1880 tcp->u_arg[4] = x86_64_regs.r8; 1881 tcp->u_arg[5] = x86_64_regs.r9; 1882# ifdef X32 1883 tcp->ext_arg[0] = x86_64_regs.rdi; 1884 tcp->ext_arg[1] = x86_64_regs.rsi; 1885 tcp->ext_arg[2] = x86_64_regs.rdx; 1886 tcp->ext_arg[3] = x86_64_regs.r10; 1887 tcp->ext_arg[4] = x86_64_regs.r8; 1888 tcp->ext_arg[5] = x86_64_regs.r9; 1889# endif 1890 } else { 1891 /* i386 ABI */ 1892 /* Zero-extend from 32 bits */ 1893 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1894 * if you need to use *sign-extended* parameter. 1895 */ 1896 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1897 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1898 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1899 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1900 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1901 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1902 } 1903#elif defined(MICROBLAZE) 1904 for (i = 0; i < nargs; ++i) 1905 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1906 return -1; 1907#elif defined(CRISV10) || defined(CRISV32) 1908 static const int crisregs[MAX_ARGS] = { 1909 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1910 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1911 }; 1912 1913 for (i = 0; i < nargs; ++i) 1914 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1915 return -1; 1916#elif defined(TILE) 1917 for (i = 0; i < nargs; ++i) 1918 tcp->u_arg[i] = tile_regs.regs[i]; 1919#elif defined(M68K) 1920 for (i = 0; i < nargs; ++i) 1921 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1922 return -1; 1923#elif defined(OR1K) 1924 (void)nargs; 1925 for (i = 0; i < 6; ++i) 1926 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1927#elif defined(METAG) 1928 for (i = 0; i < nargs; i++) 1929 /* arguments go backwards from D1Ar1 (D1.3) */ 1930 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1931#elif defined(XTENSA) 1932 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1933 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1934 for (i = 0; i < nargs; ++i) 1935 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1936 return -1; 1937#else /* Other architecture (32bits specific) */ 1938 for (i = 0; i < nargs; ++i) 1939 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 1940 return -1; 1941#endif 1942 return 1; 1943} 1944 1945static int 1946trace_syscall_entering(struct tcb *tcp) 1947{ 1948 int res, scno_good; 1949 1950#if defined TCB_WAITEXECVE 1951 if (tcp->flags & TCB_WAITEXECVE) { 1952 /* This is the post-execve SIGTRAP. */ 1953 tcp->flags &= ~TCB_WAITEXECVE; 1954 return 0; 1955 } 1956#endif 1957 1958 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 1959 if (res == 0) 1960 return res; 1961 if (res == 1) { 1962 res = syscall_fixup_on_sysenter(tcp); 1963 if (res == 0) 1964 return res; 1965 if (res == 1) 1966 res = get_syscall_args(tcp); 1967 } 1968 1969 if (res != 1) { 1970 printleader(tcp); 1971 if (scno_good != 1) 1972 tprints("????" /* anti-trigraph gap */ "("); 1973 else if (tcp->qual_flg & UNDEFINED_SCNO) 1974 tprintf("%s(", undefined_scno_name(tcp)); 1975 else 1976 tprintf("%s(", tcp->s_ent->sys_name); 1977 /* 1978 * " <unavailable>" will be added later by the code which 1979 * detects ptrace errors. 1980 */ 1981 goto ret; 1982 } 1983 1984 if ( sys_execve == tcp->s_ent->sys_func 1985# if defined(SPARC) || defined(SPARC64) 1986 || sys_execv == tcp->s_ent->sys_func 1987# endif 1988 ) { 1989 hide_log_until_execve = 0; 1990 } 1991 1992#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 1993 while (1) { 1994# ifdef SYS_socket_subcall 1995 if (tcp->s_ent->sys_func == sys_socketcall) { 1996 decode_socket_subcall(tcp); 1997 break; 1998 } 1999# endif 2000# ifdef SYS_ipc_subcall 2001 if (tcp->s_ent->sys_func == sys_ipc) { 2002 decode_ipc_subcall(tcp); 2003 break; 2004 } 2005# endif 2006 break; 2007 } 2008#endif 2009 2010 if (need_fork_exec_workarounds) 2011 syscall_fixup_for_fork_exec(tcp); 2012 2013 if (!(tcp->qual_flg & QUAL_TRACE) 2014 || (tracing_paths && !pathtrace_match(tcp)) 2015 ) { 2016 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 2017 return 0; 2018 } 2019 2020 tcp->flags &= ~TCB_FILTERED; 2021 2022 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 2023 res = 0; 2024 goto ret; 2025 } 2026 2027 printleader(tcp); 2028 if (tcp->qual_flg & UNDEFINED_SCNO) 2029 tprintf("%s(", undefined_scno_name(tcp)); 2030 else 2031 tprintf("%s(", tcp->s_ent->sys_name); 2032 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 2033 res = printargs(tcp); 2034 else 2035 res = tcp->s_ent->sys_func(tcp); 2036 2037 fflush(tcp->outf); 2038 ret: 2039 tcp->flags |= TCB_INSYSCALL; 2040 /* Measure the entrance time as late as possible to avoid errors. */ 2041 if (Tflag || cflag) 2042 gettimeofday(&tcp->etime, NULL); 2043 return res; 2044} 2045 2046/* Returns: 2047 * 1: ok, continue in trace_syscall_exiting(). 2048 * -1: error, trace_syscall_exiting() should print error indicator 2049 * ("????" etc) and bail out. 2050 */ 2051static int 2052get_syscall_result(struct tcb *tcp) 2053{ 2054#if defined(S390) || defined(S390X) 2055 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 2056 return -1; 2057#elif defined(POWERPC) 2058 /* already done by get_regs */ 2059#elif defined(AVR32) 2060 /* already done by get_regs */ 2061#elif defined(BFIN) 2062 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 2063 return -1; 2064#elif defined(I386) 2065 /* already done by get_regs */ 2066#elif defined(X86_64) || defined(X32) 2067 /* already done by get_regs */ 2068#elif defined(IA64) 2069# define IA64_PSR_IS ((long)1 << 34) 2070 long psr; 2071 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 2072 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 2073 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 2074 return -1; 2075 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 2076 return -1; 2077#elif defined(ARM) 2078 /* already done by get_regs */ 2079#elif defined(AARCH64) 2080 /* register reading already done by get_regs */ 2081 2082 /* Used to do this, but we did it on syscall entry already: */ 2083 /* We are in 64-bit mode (personality 1) if register struct is aarch64_regs, 2084 * else it's personality 0. 2085 */ 2086 /*update_personality(tcp, aarch64_io.iov_len == sizeof(aarch64_regs));*/ 2087#elif defined(M68K) 2088 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 2089 return -1; 2090#elif defined(LINUX_MIPSN32) 2091 unsigned long long regs[38]; 2092 2093 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 2094 return -1; 2095 mips_a3 = regs[REG_A3]; 2096 mips_r2 = regs[REG_V0]; 2097#elif defined(MIPS) 2098 if (upeek(tcp->pid, REG_A3, &mips_a3) < 0) 2099 return -1; 2100 if (upeek(tcp->pid, REG_V0, &mips_r2) < 0) 2101 return -1; 2102#elif defined(ALPHA) 2103 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 2104 return -1; 2105 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 2106 return -1; 2107#elif defined(SPARC) || defined(SPARC64) 2108 /* already done by get_regs */ 2109#elif defined(HPPA) 2110 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 2111 return -1; 2112#elif defined(SH) 2113 /* new syscall ABI returns result in R0 */ 2114 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 2115 return -1; 2116#elif defined(SH64) 2117 /* ABI defines result returned in r9 */ 2118 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 2119 return -1; 2120#elif defined(CRISV10) || defined(CRISV32) 2121 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 2122 return -1; 2123#elif defined(TILE) 2124 /* already done by get_regs */ 2125#elif defined(MICROBLAZE) 2126 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 2127 return -1; 2128#elif defined(OR1K) 2129 /* already done by get_regs */ 2130#elif defined(METAG) 2131 /* already done by get_regs */ 2132#elif defined(XTENSA) 2133 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 2134 return -1; 2135#endif 2136 return 1; 2137} 2138 2139/* Called at each syscall exit */ 2140static void 2141syscall_fixup_on_sysexit(struct tcb *tcp) 2142{ 2143#if defined(S390) || defined(S390X) 2144 if ((tcp->flags & TCB_WAITEXECVE) 2145 && (s390_gpr2 == -ENOSYS || s390_gpr2 == tcp->scno)) { 2146 /* 2147 * Return from execve. 2148 * Fake a return value of zero. We leave the TCB_WAITEXECVE 2149 * flag set for the post-execve SIGTRAP to see and reset. 2150 */ 2151 s390_gpr2 = 0; 2152 } 2153#endif 2154} 2155 2156/* 2157 * Check the syscall return value register value for whether it is 2158 * a negated errno code indicating an error, or a success return value. 2159 */ 2160static inline int 2161is_negated_errno(unsigned long int val) 2162{ 2163 unsigned long int max = -(long int) nerrnos; 2164#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 2165 if (current_wordsize < sizeof(val)) { 2166 val = (unsigned int) val; 2167 max = (unsigned int) max; 2168 } 2169#endif 2170 return val > max; 2171} 2172 2173#if defined(X32) 2174static inline int 2175is_negated_errno_x32(unsigned long long val) 2176{ 2177 unsigned long long max = -(long long) nerrnos; 2178 /* 2179 * current_wordsize is 4 even in personality 0 (native X32) 2180 * but truncation _must not_ be done in it. 2181 * can't check current_wordsize here! 2182 */ 2183 if (current_personality != 0) { 2184 val = (uint32_t) val; 2185 max = (uint32_t) max; 2186 } 2187 return val > max; 2188} 2189#endif 2190 2191/* Returns: 2192 * 1: ok, continue in trace_syscall_exiting(). 2193 * -1: error, trace_syscall_exiting() should print error indicator 2194 * ("????" etc) and bail out. 2195 */ 2196static void 2197get_error(struct tcb *tcp) 2198{ 2199 int u_error = 0; 2200 int check_errno = 1; 2201 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 2202 check_errno = 0; 2203 } 2204#if defined(S390) || defined(S390X) 2205 if (check_errno && is_negated_errno(s390_gpr2)) { 2206 tcp->u_rval = -1; 2207 u_error = -s390_gpr2; 2208 } 2209 else { 2210 tcp->u_rval = s390_gpr2; 2211 } 2212#elif defined(I386) 2213 if (check_errno && is_negated_errno(i386_regs.eax)) { 2214 tcp->u_rval = -1; 2215 u_error = -i386_regs.eax; 2216 } 2217 else { 2218 tcp->u_rval = i386_regs.eax; 2219 } 2220#elif defined(X86_64) 2221 long rax; 2222 if (x86_io.iov_len == sizeof(i386_regs)) { 2223 /* Sign extend from 32 bits */ 2224 rax = (int32_t)i386_regs.eax; 2225 } else { 2226 rax = x86_64_regs.rax; 2227 } 2228 if (check_errno && is_negated_errno(rax)) { 2229 tcp->u_rval = -1; 2230 u_error = -rax; 2231 } 2232 else { 2233 tcp->u_rval = rax; 2234 } 2235#elif defined(X32) 2236 /* In X32, return value is 64-bit (llseek uses one). 2237 * Using merely "long rax" would not work. 2238 */ 2239 long long rax; 2240 if (x86_io.iov_len == sizeof(i386_regs)) { 2241 /* Sign extend from 32 bits */ 2242 rax = (int32_t)i386_regs.eax; 2243 } else { 2244 rax = x86_64_regs.rax; 2245 } 2246 /* Careful: is_negated_errno() works only on longs */ 2247 if (check_errno && is_negated_errno_x32(rax)) { 2248 tcp->u_rval = -1; 2249 u_error = -rax; 2250 } 2251 else { 2252 tcp->u_rval = rax; /* truncating */ 2253 tcp->u_lrval = rax; 2254 } 2255#elif defined(IA64) 2256 if (ia64_ia32mode) { 2257 int err; 2258 2259 err = (int)ia64_r8; 2260 if (check_errno && is_negated_errno(err)) { 2261 tcp->u_rval = -1; 2262 u_error = -err; 2263 } 2264 else { 2265 tcp->u_rval = err; 2266 } 2267 } else { 2268 if (check_errno && ia64_r10) { 2269 tcp->u_rval = -1; 2270 u_error = ia64_r8; 2271 } else { 2272 tcp->u_rval = ia64_r8; 2273 } 2274 } 2275#elif defined(MIPS) 2276 if (check_errno && mips_a3) { 2277 tcp->u_rval = -1; 2278 u_error = mips_r2; 2279 } else { 2280 tcp->u_rval = mips_r2; 2281# if defined(LINUX_MIPSN32) 2282 tcp->u_lrval = mips_r2; 2283# endif 2284 } 2285#elif defined(POWERPC) 2286 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2287 tcp->u_rval = -1; 2288 u_error = ppc_regs.gpr[3]; 2289 } 2290 else { 2291 tcp->u_rval = ppc_regs.gpr[3]; 2292 } 2293#elif defined(M68K) 2294 if (check_errno && is_negated_errno(m68k_d0)) { 2295 tcp->u_rval = -1; 2296 u_error = -m68k_d0; 2297 } 2298 else { 2299 tcp->u_rval = m68k_d0; 2300 } 2301#elif defined(ARM) || defined(AARCH64) 2302# if defined(AARCH64) 2303 if (tcp->currpers == 1) { 2304 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2305 tcp->u_rval = -1; 2306 u_error = -aarch64_regs.regs[0]; 2307 } 2308 else { 2309 tcp->u_rval = aarch64_regs.regs[0]; 2310 } 2311 } 2312 else 2313# endif 2314 { 2315 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2316 tcp->u_rval = -1; 2317 u_error = -arm_regs.ARM_r0; 2318 } 2319 else { 2320 tcp->u_rval = arm_regs.ARM_r0; 2321 } 2322 } 2323#elif defined(AVR32) 2324 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2325 tcp->u_rval = -1; 2326 u_error = -avr32_regs.r12; 2327 } 2328 else { 2329 tcp->u_rval = avr32_regs.r12; 2330 } 2331#elif defined(BFIN) 2332 if (check_errno && is_negated_errno(bfin_r0)) { 2333 tcp->u_rval = -1; 2334 u_error = -bfin_r0; 2335 } else { 2336 tcp->u_rval = bfin_r0; 2337 } 2338#elif defined(ALPHA) 2339 if (check_errno && alpha_a3) { 2340 tcp->u_rval = -1; 2341 u_error = alpha_r0; 2342 } 2343 else { 2344 tcp->u_rval = alpha_r0; 2345 } 2346#elif defined(SPARC) 2347 if (check_errno && sparc_regs.psr & PSR_C) { 2348 tcp->u_rval = -1; 2349 u_error = sparc_regs.u_regs[U_REG_O0]; 2350 } 2351 else { 2352 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2353 } 2354#elif defined(SPARC64) 2355 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2356 tcp->u_rval = -1; 2357 u_error = sparc_regs.u_regs[U_REG_O0]; 2358 } 2359 else { 2360 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2361 } 2362#elif defined(HPPA) 2363 if (check_errno && is_negated_errno(hppa_r28)) { 2364 tcp->u_rval = -1; 2365 u_error = -hppa_r28; 2366 } 2367 else { 2368 tcp->u_rval = hppa_r28; 2369 } 2370#elif defined(SH) 2371 if (check_errno && is_negated_errno(sh_r0)) { 2372 tcp->u_rval = -1; 2373 u_error = -sh_r0; 2374 } 2375 else { 2376 tcp->u_rval = sh_r0; 2377 } 2378#elif defined(SH64) 2379 if (check_errno && is_negated_errno(sh64_r9)) { 2380 tcp->u_rval = -1; 2381 u_error = -sh64_r9; 2382 } 2383 else { 2384 tcp->u_rval = sh64_r9; 2385 } 2386#elif defined(METAG) 2387 /* result pointer in D0Re0 (D0.0) */ 2388 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2389 tcp->u_rval = -1; 2390 u_error = -metag_regs.dx[0][0]; 2391 } 2392 else { 2393 tcp->u_rval = metag_regs.dx[0][0]; 2394 } 2395#elif defined(CRISV10) || defined(CRISV32) 2396 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2397 tcp->u_rval = -1; 2398 u_error = -cris_r10; 2399 } 2400 else { 2401 tcp->u_rval = cris_r10; 2402 } 2403#elif defined(TILE) 2404 /* 2405 * The standard tile calling convention returns the value (or negative 2406 * errno) in r0, and zero (or positive errno) in r1. 2407 * Until at least kernel 3.8, however, the r1 value is not reflected 2408 * in ptregs at this point, so we use r0 here. 2409 */ 2410 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2411 tcp->u_rval = -1; 2412 u_error = -tile_regs.regs[0]; 2413 } else { 2414 tcp->u_rval = tile_regs.regs[0]; 2415 } 2416#elif defined(MICROBLAZE) 2417 if (check_errno && is_negated_errno(microblaze_r3)) { 2418 tcp->u_rval = -1; 2419 u_error = -microblaze_r3; 2420 } 2421 else { 2422 tcp->u_rval = microblaze_r3; 2423 } 2424#elif defined(OR1K) 2425 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2426 tcp->u_rval = -1; 2427 u_error = -or1k_regs.gpr[11]; 2428 } 2429 else { 2430 tcp->u_rval = or1k_regs.gpr[11]; 2431 } 2432#elif defined(XTENSA) 2433 if (check_errno && is_negated_errno(xtensa_a2)) { 2434 tcp->u_rval = -1; 2435 u_error = -xtensa_a2; 2436 } 2437 else { 2438 tcp->u_rval = xtensa_a2; 2439 } 2440#endif 2441 tcp->u_error = u_error; 2442} 2443 2444static void 2445dumpio(struct tcb *tcp) 2446{ 2447 int (*func)(); 2448 2449 if (syserror(tcp)) 2450 return; 2451 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2452 return; 2453 func = tcp->s_ent->sys_func; 2454 if (func == printargs) 2455 return; 2456 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2457 if (func == sys_read || 2458 func == sys_pread || 2459 func == sys_recv || 2460 func == sys_recvfrom) 2461 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2462 else if (func == sys_readv) 2463 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2464 return; 2465 } 2466 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2467 if (func == sys_write || 2468 func == sys_pwrite || 2469 func == sys_send || 2470 func == sys_sendto) 2471 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2472 else if (func == sys_writev) 2473 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2474 return; 2475 } 2476} 2477 2478static int 2479trace_syscall_exiting(struct tcb *tcp) 2480{ 2481 int sys_res; 2482 struct timeval tv; 2483 int res; 2484 long u_error; 2485 2486 /* Measure the exit time as early as possible to avoid errors. */ 2487 if (Tflag || cflag) 2488 gettimeofday(&tv, NULL); 2489 2490#if SUPPORTED_PERSONALITIES > 1 2491 update_personality(tcp, tcp->currpers); 2492#endif 2493 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2494 if (res == 1) { 2495 syscall_fixup_on_sysexit(tcp); /* never fails */ 2496 get_error(tcp); /* never fails */ 2497 if (need_fork_exec_workarounds) 2498 syscall_fixup_for_fork_exec(tcp); 2499 if (filtered(tcp) || hide_log_until_execve) 2500 goto ret; 2501 } 2502 2503 if (cflag) { 2504 struct timeval t = tv; 2505 count_syscall(tcp, &t); 2506 if (cflag == CFLAG_ONLY_STATS) { 2507 goto ret; 2508 } 2509 } 2510 2511 /* If not in -ff mode, and printing_tcp != tcp, 2512 * then the log currently does not end with output 2513 * of _our syscall entry_, but with something else. 2514 * We need to say which syscall's return is this. 2515 * 2516 * Forced reprinting via TCB_REPRINT is used only by 2517 * "strace -ff -oLOG test/threaded_execve" corner case. 2518 * It's the only case when -ff mode needs reprinting. 2519 */ 2520 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2521 tcp->flags &= ~TCB_REPRINT; 2522 printleader(tcp); 2523 if (tcp->qual_flg & UNDEFINED_SCNO) 2524 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2525 else 2526 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2527 } 2528 printing_tcp = tcp; 2529 2530 if (res != 1) { 2531 /* There was error in one of prior ptrace ops */ 2532 tprints(") "); 2533 tabto(); 2534 tprints("= ? <unavailable>\n"); 2535 line_ended(); 2536 tcp->flags &= ~TCB_INSYSCALL; 2537 return res; 2538 } 2539 2540 sys_res = 0; 2541 if (tcp->qual_flg & QUAL_RAW) { 2542 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2543 } else { 2544 /* FIXME: not_failing_only (IOW, option -z) is broken: 2545 * failure of syscall is known only after syscall return. 2546 * Thus we end up with something like this on, say, ENOENT: 2547 * open("doesnt_exist", O_RDONLY <unfinished ...> 2548 * {next syscall decode} 2549 * whereas the intended result is that open(...) line 2550 * is not shown at all. 2551 */ 2552 if (not_failing_only && tcp->u_error) 2553 goto ret; /* ignore failed syscalls */ 2554 sys_res = tcp->s_ent->sys_func(tcp); 2555 } 2556 2557 tprints(") "); 2558 tabto(); 2559 u_error = tcp->u_error; 2560 if (tcp->qual_flg & QUAL_RAW) { 2561 if (u_error) 2562 tprintf("= -1 (errno %ld)", u_error); 2563 else 2564 tprintf("= %#lx", tcp->u_rval); 2565 } 2566 else if (!(sys_res & RVAL_NONE) && u_error) { 2567 switch (u_error) { 2568 /* Blocked signals do not interrupt any syscalls. 2569 * In this case syscalls don't return ERESTARTfoo codes. 2570 * 2571 * Deadly signals set to SIG_DFL interrupt syscalls 2572 * and kill the process regardless of which of the codes below 2573 * is returned by the interrupted syscall. 2574 * In some cases, kernel forces a kernel-generated deadly 2575 * signal to be unblocked and set to SIG_DFL (and thus cause 2576 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2577 * or SIGILL. (The alternative is to leave process spinning 2578 * forever on the faulty instruction - not useful). 2579 * 2580 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2581 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2582 * but kernel will always restart them. 2583 */ 2584 case ERESTARTSYS: 2585 /* Most common type of signal-interrupted syscall exit code. 2586 * The system call will be restarted with the same arguments 2587 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2588 */ 2589 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2590 break; 2591 case ERESTARTNOINTR: 2592 /* Rare. For example, fork() returns this if interrupted. 2593 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2594 */ 2595 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2596 break; 2597 case ERESTARTNOHAND: 2598 /* pause(), rt_sigsuspend() etc use this code. 2599 * SA_RESTART is ignored (assumed not set): 2600 * syscall won't restart (will return EINTR instead) 2601 * even after signal with SA_RESTART set. However, 2602 * after SIG_IGN or SIG_DFL signal it will restart 2603 * (thus the name "restart only if has no handler"). 2604 */ 2605 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2606 break; 2607 case ERESTART_RESTARTBLOCK: 2608 /* Syscalls like nanosleep(), poll() which can't be 2609 * restarted with their original arguments use this 2610 * code. Kernel will execute restart_syscall() instead, 2611 * which changes arguments before restarting syscall. 2612 * SA_RESTART is ignored (assumed not set) similarly 2613 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2614 * since restart data is saved in "restart block" 2615 * in task struct, and if signal handler uses a syscall 2616 * which in turn saves another such restart block, 2617 * old data is lost and restart becomes impossible) 2618 */ 2619 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2620 break; 2621 default: 2622 if (u_error < 0) 2623 tprintf("= -1 E??? (errno %ld)", u_error); 2624 else if (u_error < nerrnos) 2625 tprintf("= -1 %s (%s)", errnoent[u_error], 2626 strerror(u_error)); 2627 else 2628 tprintf("= -1 ERRNO_%ld (%s)", u_error, 2629 strerror(u_error)); 2630 break; 2631 } 2632 if ((sys_res & RVAL_STR) && tcp->auxstr) 2633 tprintf(" (%s)", tcp->auxstr); 2634 } 2635 else { 2636 if (sys_res & RVAL_NONE) 2637 tprints("= ?"); 2638 else { 2639 switch (sys_res & RVAL_MASK) { 2640 case RVAL_HEX: 2641 tprintf("= %#lx", tcp->u_rval); 2642 break; 2643 case RVAL_OCTAL: 2644 tprintf("= %#lo", tcp->u_rval); 2645 break; 2646 case RVAL_UDECIMAL: 2647 tprintf("= %lu", tcp->u_rval); 2648 break; 2649 case RVAL_DECIMAL: 2650 tprintf("= %ld", tcp->u_rval); 2651 break; 2652#if defined(LINUX_MIPSN32) || defined(X32) 2653 /* 2654 case RVAL_LHEX: 2655 tprintf("= %#llx", tcp->u_lrval); 2656 break; 2657 case RVAL_LOCTAL: 2658 tprintf("= %#llo", tcp->u_lrval); 2659 break; 2660 */ 2661 case RVAL_LUDECIMAL: 2662 tprintf("= %llu", tcp->u_lrval); 2663 break; 2664 /* 2665 case RVAL_LDECIMAL: 2666 tprintf("= %lld", tcp->u_lrval); 2667 break; 2668 */ 2669#endif 2670 default: 2671 fprintf(stderr, 2672 "invalid rval format\n"); 2673 break; 2674 } 2675 } 2676 if ((sys_res & RVAL_STR) && tcp->auxstr) 2677 tprintf(" (%s)", tcp->auxstr); 2678 } 2679 if (Tflag) { 2680 tv_sub(&tv, &tv, &tcp->etime); 2681 tprintf(" <%ld.%06ld>", 2682 (long) tv.tv_sec, (long) tv.tv_usec); 2683 } 2684 tprints("\n"); 2685 dumpio(tcp); 2686 line_ended(); 2687 2688 ret: 2689 tcp->flags &= ~TCB_INSYSCALL; 2690 return 0; 2691} 2692 2693int 2694trace_syscall(struct tcb *tcp) 2695{ 2696 return exiting(tcp) ? 2697 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2698} 2699