syscall.c revision 6141392856a170c9297783e6bfbd9fd970f76fdf
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#elif defined(HAVE_LINUX_PTRACE_H) 41# undef PTRACE_SYSCALL 42# ifdef HAVE_STRUCT_IA64_FPREG 43# define ia64_fpreg XXX_ia64_fpreg 44# endif 45# ifdef HAVE_STRUCT_PT_ALL_USER_REGS 46# define pt_all_user_regs XXX_pt_all_user_regs 47# endif 48# ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS 49# define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args 50# endif 51# include <linux/ptrace.h> 52# undef ptrace_peeksiginfo_args 53# undef ia64_fpreg 54# undef pt_all_user_regs 55#endif 56 57#if defined(SPARC64) 58# undef PTRACE_GETREGS 59# define PTRACE_GETREGS PTRACE_GETREGS64 60# undef PTRACE_SETREGS 61# define PTRACE_SETREGS PTRACE_SETREGS64 62#endif 63 64#if defined(IA64) 65# include <asm/ptrace_offsets.h> 66# include <asm/rse.h> 67#endif 68 69/* for struct iovec */ 70#include <sys/uio.h> 71/* for NT_PRSTATUS */ 72#ifdef HAVE_ELF_H 73# include <elf.h> 74#endif 75 76#if defined(AARCH64) 77# include <asm/ptrace.h> 78#endif 79 80#if defined(XTENSA) 81# include <asm/ptrace.h> 82#endif 83 84#ifndef NSIG 85# warning: NSIG is not defined, using 32 86# define NSIG 32 87#endif 88 89#include "syscall.h" 90 91/* Define these shorthand notations to simplify the syscallent files. */ 92#define TD TRACE_DESC 93#define TF TRACE_FILE 94#define TI TRACE_IPC 95#define TN TRACE_NETWORK 96#define TP TRACE_PROCESS 97#define TS TRACE_SIGNAL 98#define TM TRACE_MEMORY 99#define NF SYSCALL_NEVER_FAILS 100#define MA MAX_ARGS 101 102const struct_sysent sysent0[] = { 103#include "syscallent.h" 104}; 105 106#if SUPPORTED_PERSONALITIES > 1 107static const struct_sysent sysent1[] = { 108# include "syscallent1.h" 109}; 110#endif 111 112#if SUPPORTED_PERSONALITIES > 2 113static const struct_sysent sysent2[] = { 114# include "syscallent2.h" 115}; 116#endif 117 118/* Now undef them since short defines cause wicked namespace pollution. */ 119#undef TD 120#undef TF 121#undef TI 122#undef TN 123#undef TP 124#undef TS 125#undef TM 126#undef NF 127#undef MA 128 129/* 130 * `ioctlent.h' may be generated from `ioctlent.raw' by the auxiliary 131 * program `ioctlsort', such that the list is sorted by the `code' field. 132 * This has the side-effect of resolving the _IO.. macros into 133 * plain integers, eliminating the need to include here everything 134 * in "/usr/include". 135 */ 136 137const char *const errnoent0[] = { 138#include "errnoent.h" 139}; 140const char *const signalent0[] = { 141#include "signalent.h" 142}; 143const struct_ioctlent ioctlent0[] = { 144#include "ioctlent.h" 145}; 146 147#if SUPPORTED_PERSONALITIES > 1 148static const char *const errnoent1[] = { 149# include "errnoent1.h" 150}; 151static const char *const signalent1[] = { 152# include "signalent1.h" 153}; 154static const struct_ioctlent ioctlent1[] = { 155# include "ioctlent1.h" 156}; 157#endif 158 159#if SUPPORTED_PERSONALITIES > 2 160static const char *const errnoent2[] = { 161# include "errnoent2.h" 162}; 163static const char *const signalent2[] = { 164# include "signalent2.h" 165}; 166static const struct_ioctlent ioctlent2[] = { 167# include "ioctlent2.h" 168}; 169#endif 170 171enum { 172 nsyscalls0 = ARRAY_SIZE(sysent0) 173#if SUPPORTED_PERSONALITIES > 1 174 , nsyscalls1 = ARRAY_SIZE(sysent1) 175# if SUPPORTED_PERSONALITIES > 2 176 , nsyscalls2 = ARRAY_SIZE(sysent2) 177# endif 178#endif 179}; 180 181enum { 182 nerrnos0 = ARRAY_SIZE(errnoent0) 183#if SUPPORTED_PERSONALITIES > 1 184 , nerrnos1 = ARRAY_SIZE(errnoent1) 185# if SUPPORTED_PERSONALITIES > 2 186 , nerrnos2 = ARRAY_SIZE(errnoent2) 187# endif 188#endif 189}; 190 191enum { 192 nsignals0 = ARRAY_SIZE(signalent0) 193#if SUPPORTED_PERSONALITIES > 1 194 , nsignals1 = ARRAY_SIZE(signalent1) 195# if SUPPORTED_PERSONALITIES > 2 196 , nsignals2 = ARRAY_SIZE(signalent2) 197# endif 198#endif 199}; 200 201enum { 202 nioctlents0 = ARRAY_SIZE(ioctlent0) 203#if SUPPORTED_PERSONALITIES > 1 204 , nioctlents1 = ARRAY_SIZE(ioctlent1) 205# if SUPPORTED_PERSONALITIES > 2 206 , nioctlents2 = ARRAY_SIZE(ioctlent2) 207# endif 208#endif 209}; 210 211#if SUPPORTED_PERSONALITIES > 1 212const struct_sysent *sysent = sysent0; 213const char *const *errnoent = errnoent0; 214const char *const *signalent = signalent0; 215const struct_ioctlent *ioctlent = ioctlent0; 216#endif 217unsigned nsyscalls = nsyscalls0; 218unsigned nerrnos = nerrnos0; 219unsigned nsignals = nsignals0; 220unsigned nioctlents = nioctlents0; 221 222unsigned num_quals; 223qualbits_t *qual_vec[SUPPORTED_PERSONALITIES]; 224 225static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = { 226 nsyscalls0, 227#if SUPPORTED_PERSONALITIES > 1 228 nsyscalls1, 229#endif 230#if SUPPORTED_PERSONALITIES > 2 231 nsyscalls2, 232#endif 233}; 234static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = { 235 sysent0, 236#if SUPPORTED_PERSONALITIES > 1 237 sysent1, 238#endif 239#if SUPPORTED_PERSONALITIES > 2 240 sysent2, 241#endif 242}; 243 244enum { 245 MAX_NSYSCALLS1 = (nsyscalls0 246#if SUPPORTED_PERSONALITIES > 1 247 > nsyscalls1 ? nsyscalls0 : nsyscalls1 248#endif 249 ), 250 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1 251#if SUPPORTED_PERSONALITIES > 2 252 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2 253#endif 254 ), 255 MAX_NSYSCALLS = MAX_NSYSCALLS2, 256 /* We are ready for arches with up to 255 signals, 257 * even though the largest known signo is on MIPS and it is 128. 258 * The number of existing syscalls on all arches is 259 * larger that 255 anyway, so it is just a pedantic matter. 260 */ 261 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255 262}; 263 264#if SUPPORTED_PERSONALITIES > 1 265unsigned current_personality; 266 267# ifndef current_wordsize 268unsigned current_wordsize; 269static const int personality_wordsize[SUPPORTED_PERSONALITIES] = { 270 PERSONALITY0_WORDSIZE, 271 PERSONALITY1_WORDSIZE, 272# if SUPPORTED_PERSONALITIES > 2 273 PERSONALITY2_WORDSIZE, 274# endif 275}; 276# endif 277 278void 279set_personality(int personality) 280{ 281 nsyscalls = nsyscall_vec[personality]; 282 sysent = sysent_vec[personality]; 283 284 switch (personality) { 285 case 0: 286 errnoent = errnoent0; 287 nerrnos = nerrnos0; 288 ioctlent = ioctlent0; 289 nioctlents = nioctlents0; 290 signalent = signalent0; 291 nsignals = nsignals0; 292 break; 293 294 case 1: 295 errnoent = errnoent1; 296 nerrnos = nerrnos1; 297 ioctlent = ioctlent1; 298 nioctlents = nioctlents1; 299 signalent = signalent1; 300 nsignals = nsignals1; 301 break; 302 303# if SUPPORTED_PERSONALITIES > 2 304 case 2: 305 errnoent = errnoent2; 306 nerrnos = nerrnos2; 307 ioctlent = ioctlent2; 308 nioctlents = nioctlents2; 309 signalent = signalent2; 310 nsignals = nsignals2; 311 break; 312# endif 313 } 314 315 current_personality = personality; 316# ifndef current_wordsize 317 current_wordsize = personality_wordsize[personality]; 318# endif 319} 320 321static void 322update_personality(struct tcb *tcp, int personality) 323{ 324 if (personality == current_personality) 325 return; 326 set_personality(personality); 327 328 if (personality == tcp->currpers) 329 return; 330 tcp->currpers = personality; 331 332# if defined(POWERPC64) 333 if (!qflag) { 334 static const char *const names[] = {"64 bit", "32 bit"}; 335 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 336 tcp->pid, names[personality]); 337 } 338# elif defined(X86_64) 339 if (!qflag) { 340 static const char *const names[] = {"64 bit", "32 bit", "x32"}; 341 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 342 tcp->pid, names[personality]); 343 } 344# elif defined(X32) 345 if (!qflag) { 346 static const char *const names[] = {"x32", "32 bit"}; 347 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 348 tcp->pid, names[personality]); 349 } 350# elif defined(AARCH64) 351 if (!qflag) { 352 static const char *const names[] = {"32-bit", "AArch64"}; 353 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 354 tcp->pid, names[personality]); 355 } 356# elif defined(TILE) 357 if (!qflag) { 358 static const char *const names[] = {"64-bit", "32-bit"}; 359 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 360 tcp->pid, names[personality]); 361 } 362# endif 363} 364#endif 365 366static int qual_syscall(), qual_signal(), qual_desc(); 367 368static const struct qual_options { 369 int bitflag; 370 const char *option_name; 371 int (*qualify)(const char *, int, int); 372 const char *argument_name; 373} qual_options[] = { 374 { QUAL_TRACE, "trace", qual_syscall, "system call" }, 375 { QUAL_TRACE, "t", qual_syscall, "system call" }, 376 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" }, 377 { QUAL_ABBREV, "a", qual_syscall, "system call" }, 378 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" }, 379 { QUAL_VERBOSE, "v", qual_syscall, "system call" }, 380 { QUAL_RAW, "raw", qual_syscall, "system call" }, 381 { QUAL_RAW, "x", qual_syscall, "system call" }, 382 { QUAL_SIGNAL, "signal", qual_signal, "signal" }, 383 { QUAL_SIGNAL, "signals", qual_signal, "signal" }, 384 { QUAL_SIGNAL, "s", qual_signal, "signal" }, 385 { QUAL_READ, "read", qual_desc, "descriptor" }, 386 { QUAL_READ, "reads", qual_desc, "descriptor" }, 387 { QUAL_READ, "r", qual_desc, "descriptor" }, 388 { QUAL_WRITE, "write", qual_desc, "descriptor" }, 389 { QUAL_WRITE, "writes", qual_desc, "descriptor" }, 390 { QUAL_WRITE, "w", qual_desc, "descriptor" }, 391 { 0, NULL, NULL, NULL }, 392}; 393 394static void 395reallocate_qual(int n) 396{ 397 unsigned p; 398 qualbits_t *qp; 399 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 400 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t)); 401 if (!qp) 402 die_out_of_memory(); 403 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t)); 404 } 405 num_quals = n; 406} 407 408static void 409qualify_one(int n, int bitflag, int not, int pers) 410{ 411 unsigned p; 412 413 if (num_quals <= n) 414 reallocate_qual(n + 1); 415 416 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 417 if (pers == p || pers < 0) { 418 if (not) 419 qual_vec[p][n] &= ~bitflag; 420 else 421 qual_vec[p][n] |= bitflag; 422 } 423 } 424} 425 426static int 427qual_syscall(const char *s, int bitflag, int not) 428{ 429 unsigned p; 430 unsigned i; 431 int rc = -1; 432 433 if (*s >= '0' && *s <= '9') { 434 i = string_to_uint(s); 435 if (i >= MAX_NSYSCALLS) 436 return -1; 437 qualify_one(i, bitflag, not, -1); 438 return 0; 439 } 440 441 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 442 for (i = 0; i < nsyscall_vec[p]; i++) { 443 if (sysent_vec[p][i].sys_name 444 && strcmp(s, sysent_vec[p][i].sys_name) == 0 445 ) { 446 qualify_one(i, bitflag, not, p); 447 rc = 0; 448 } 449 } 450 } 451 452 return rc; 453} 454 455static int 456qual_signal(const char *s, int bitflag, int not) 457{ 458 int i; 459 460 if (*s >= '0' && *s <= '9') { 461 int signo = string_to_uint(s); 462 if (signo < 0 || signo > 255) 463 return -1; 464 qualify_one(signo, bitflag, not, -1); 465 return 0; 466 } 467 if (strncasecmp(s, "SIG", 3) == 0) 468 s += 3; 469 for (i = 0; i <= NSIG; i++) { 470 if (strcasecmp(s, signame(i) + 3) == 0) { 471 qualify_one(i, bitflag, not, -1); 472 return 0; 473 } 474 } 475 return -1; 476} 477 478static int 479qual_desc(const char *s, int bitflag, int not) 480{ 481 if (*s >= '0' && *s <= '9') { 482 int desc = string_to_uint(s); 483 if (desc < 0 || desc > 0x7fff) /* paranoia */ 484 return -1; 485 qualify_one(desc, bitflag, not, -1); 486 return 0; 487 } 488 return -1; 489} 490 491static int 492lookup_class(const char *s) 493{ 494 if (strcmp(s, "file") == 0) 495 return TRACE_FILE; 496 if (strcmp(s, "ipc") == 0) 497 return TRACE_IPC; 498 if (strcmp(s, "network") == 0) 499 return TRACE_NETWORK; 500 if (strcmp(s, "process") == 0) 501 return TRACE_PROCESS; 502 if (strcmp(s, "signal") == 0) 503 return TRACE_SIGNAL; 504 if (strcmp(s, "desc") == 0) 505 return TRACE_DESC; 506 if (strcmp(s, "memory") == 0) 507 return TRACE_MEMORY; 508 return -1; 509} 510 511void 512qualify(const char *s) 513{ 514 const struct qual_options *opt; 515 int not; 516 char *copy; 517 const char *p; 518 int i, n; 519 520 if (num_quals == 0) 521 reallocate_qual(MIN_QUALS); 522 523 opt = &qual_options[0]; 524 for (i = 0; (p = qual_options[i].option_name); i++) { 525 n = strlen(p); 526 if (strncmp(s, p, n) == 0 && s[n] == '=') { 527 opt = &qual_options[i]; 528 s += n + 1; 529 break; 530 } 531 } 532 not = 0; 533 if (*s == '!') { 534 not = 1; 535 s++; 536 } 537 if (strcmp(s, "none") == 0) { 538 not = 1 - not; 539 s = "all"; 540 } 541 if (strcmp(s, "all") == 0) { 542 for (i = 0; i < num_quals; i++) { 543 qualify_one(i, opt->bitflag, not, -1); 544 } 545 return; 546 } 547 for (i = 0; i < num_quals; i++) { 548 qualify_one(i, opt->bitflag, !not, -1); 549 } 550 copy = strdup(s); 551 if (!copy) 552 die_out_of_memory(); 553 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) { 554 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) { 555 unsigned pers; 556 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) { 557 for (i = 0; i < nsyscall_vec[pers]; i++) 558 if (sysent_vec[pers][i].sys_flags & n) 559 qualify_one(i, opt->bitflag, not, pers); 560 } 561 continue; 562 } 563 if (opt->qualify(p, opt->bitflag, not)) { 564 error_msg_and_die("invalid %s '%s'", 565 opt->argument_name, p); 566 } 567 } 568 free(copy); 569 return; 570} 571 572#ifdef SYS_socket_subcall 573static void 574decode_socket_subcall(struct tcb *tcp) 575{ 576 unsigned long addr; 577 unsigned int i, n, size; 578 579 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls) 580 return; 581 582 tcp->scno = SYS_socket_subcall + tcp->u_arg[0]; 583 tcp->qual_flg = qual_flags[tcp->scno]; 584 tcp->s_ent = &sysent[tcp->scno]; 585 addr = tcp->u_arg[1]; 586 size = current_wordsize; 587 n = tcp->s_ent->nargs; 588 for (i = 0; i < n; ++i) { 589 if (size == sizeof(int)) { 590 unsigned int arg; 591 if (umove(tcp, addr, &arg) < 0) 592 arg = 0; 593 tcp->u_arg[i] = arg; 594 } 595 else { 596 unsigned long arg; 597 if (umove(tcp, addr, &arg) < 0) 598 arg = 0; 599 tcp->u_arg[i] = arg; 600 } 601 addr += size; 602 } 603} 604#endif 605 606#ifdef SYS_ipc_subcall 607static void 608decode_ipc_subcall(struct tcb *tcp) 609{ 610 unsigned int i, n; 611 612 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls) 613 return; 614 615 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0]; 616 tcp->qual_flg = qual_flags[tcp->scno]; 617 tcp->s_ent = &sysent[tcp->scno]; 618 n = tcp->s_ent->nargs; 619 for (i = 0; i < n; i++) 620 tcp->u_arg[i] = tcp->u_arg[i + 1]; 621} 622#endif 623 624int 625printargs(struct tcb *tcp) 626{ 627 if (entering(tcp)) { 628 int i; 629 int n = tcp->s_ent->nargs; 630 for (i = 0; i < n; i++) 631 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]); 632 } 633 return 0; 634} 635 636int 637printargs_lu(struct tcb *tcp) 638{ 639 if (entering(tcp)) { 640 int i; 641 int n = tcp->s_ent->nargs; 642 for (i = 0; i < n; i++) 643 tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]); 644 } 645 return 0; 646} 647 648int 649printargs_ld(struct tcb *tcp) 650{ 651 if (entering(tcp)) { 652 int i; 653 int n = tcp->s_ent->nargs; 654 for (i = 0; i < n; i++) 655 tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]); 656 } 657 return 0; 658} 659 660#if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH) 661long 662getrval2(struct tcb *tcp) 663{ 664 long val; 665 666# if defined(SPARC) || defined(SPARC64) 667 val = sparc_regs.u_regs[U_REG_O1]; 668# elif defined(SH) 669 if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0) 670 return -1; 671# elif defined(IA64) 672 if (upeek(tcp->pid, PT_R9, &val) < 0) 673 return -1; 674# endif 675 676 return val; 677} 678#endif 679 680#if defined(I386) 681static struct user_regs_struct i386_regs; 682/* Cast suppresses signedness warning (.esp is long, not unsigned long) */ 683uint32_t *const i386_esp_ptr = (uint32_t*)&i386_regs.esp; 684# define ARCH_REGS_FOR_GETREGSET i386_regs 685#elif defined(X86_64) || defined(X32) 686/* 687 * On i386, pt_regs and user_regs_struct are the same, 688 * but on 64 bit x86, user_regs_struct has six more fields: 689 * fs_base, gs_base, ds, es, fs, gs. 690 * PTRACE_GETREGS fills them too, so struct pt_regs would overflow. 691 */ 692struct i386_user_regs_struct { 693 uint32_t ebx; 694 uint32_t ecx; 695 uint32_t edx; 696 uint32_t esi; 697 uint32_t edi; 698 uint32_t ebp; 699 uint32_t eax; 700 uint32_t xds; 701 uint32_t xes; 702 uint32_t xfs; 703 uint32_t xgs; 704 uint32_t orig_eax; 705 uint32_t eip; 706 uint32_t xcs; 707 uint32_t eflags; 708 uint32_t esp; 709 uint32_t xss; 710}; 711static union { 712 struct user_regs_struct x86_64_r; 713 struct i386_user_regs_struct i386_r; 714} x86_regs_union; 715# define x86_64_regs x86_regs_union.x86_64_r 716# define i386_regs x86_regs_union.i386_r 717uint32_t *const i386_esp_ptr = &i386_regs.esp; 718static struct iovec x86_io = { 719 .iov_base = &x86_regs_union 720}; 721#elif defined(IA64) 722bool ia64_ia32mode = 0; /* not static */ 723static long ia64_r8, ia64_r10; 724#elif defined(POWERPC) 725struct pt_regs ppc_regs; 726#elif defined(M68K) 727static long m68k_d0; 728#elif defined(BFIN) 729static long bfin_r0; 730#elif defined(ARM) 731struct pt_regs arm_regs; /* not static */ 732# define ARCH_REGS_FOR_GETREGSET arm_regs 733#elif defined(AARCH64) 734static union { 735 struct user_pt_regs aarch64_r; 736 struct arm_pt_regs arm_r; 737} arm_regs_union; 738# define aarch64_regs arm_regs_union.aarch64_r 739# define arm_regs arm_regs_union.arm_r 740static struct iovec aarch64_io = { 741 .iov_base = &arm_regs_union 742}; 743#elif defined(ALPHA) 744static long alpha_r0; 745static long alpha_a3; 746#elif defined(AVR32) 747static struct pt_regs avr32_regs; 748#elif defined(SPARC) || defined(SPARC64) 749struct pt_regs sparc_regs; /* not static */ 750#elif defined(LINUX_MIPSN32) 751static long long mips_a3; 752static long long mips_r2; 753#elif defined(MIPS) 754static long mips_a3; 755static long mips_r2; 756#elif defined(S390) || defined(S390X) 757static long s390_gpr2; 758#elif defined(HPPA) 759static long hppa_r28; 760#elif defined(SH) 761static long sh_r0; 762#elif defined(SH64) 763static long sh64_r9; 764#elif defined(CRISV10) || defined(CRISV32) 765static long cris_r10; 766#elif defined(TILE) 767struct pt_regs tile_regs; 768#elif defined(MICROBLAZE) 769static long microblaze_r3; 770#elif defined(OR1K) 771static struct user_regs_struct or1k_regs; 772# define ARCH_REGS_FOR_GETREGSET or1k_regs 773#elif defined(METAG) 774static struct user_gp_regs metag_regs; 775# define ARCH_REGS_FOR_GETREGSET metag_regs 776#elif defined(XTENSA) 777static long xtensa_a2; 778# elif defined(ARC) 779static struct user_regs_struct arc_regs; 780# define ARCH_REGS_FOR_GETREGSET arc_regs 781#endif 782 783void 784print_pc(struct tcb *tcp) 785{ 786#define PRINTBADPC tprintf(sizeof(long) == 4 ? "[????????] " : \ 787 sizeof(long) == 8 ? "[????????????????] " : \ 788 NULL /* crash */) 789 if (get_regs_error) { 790 PRINTBADPC; 791 return; 792 } 793#if defined(I386) 794 tprintf("[%08lx] ", i386_regs.eip); 795#elif defined(S390) || defined(S390X) 796 long psw; 797 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) { 798 PRINTBADPC; 799 return; 800 } 801# ifdef S390 802 tprintf("[%08lx] ", psw); 803# elif S390X 804 tprintf("[%016lx] ", psw); 805# endif 806#elif defined(X86_64) || defined(X32) 807 if (x86_io.iov_len == sizeof(i386_regs)) { 808 tprintf("[%08x] ", (unsigned) i386_regs.eip); 809 } else { 810# if defined(X86_64) 811 tprintf("[%016lx] ", (unsigned long) x86_64_regs.rip); 812# elif defined(X32) 813 /* Note: this truncates 64-bit rip to 32 bits */ 814 tprintf("[%08lx] ", (unsigned long) x86_64_regs.rip); 815# endif 816 } 817#elif defined(IA64) 818 long ip; 819 if (upeek(tcp->pid, PT_B0, &ip) < 0) { 820 PRINTBADPC; 821 return; 822 } 823 tprintf("[%08lx] ", ip); 824#elif defined(POWERPC) 825 long pc = ppc_regs.nip; 826# ifdef POWERPC64 827 tprintf("[%016lx] ", pc); 828# else 829 tprintf("[%08lx] ", pc); 830# endif 831#elif defined(M68K) 832 long pc; 833 if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) { 834 tprints("[????????] "); 835 return; 836 } 837 tprintf("[%08lx] ", pc); 838#elif defined(ALPHA) 839 long pc; 840 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 841 tprints("[????????????????] "); 842 return; 843 } 844 tprintf("[%08lx] ", pc); 845#elif defined(SPARC) 846 tprintf("[%08lx] ", sparc_regs.pc); 847#elif defined(SPARC64) 848 tprintf("[%08lx] ", sparc_regs.tpc); 849#elif defined(HPPA) 850 long pc; 851 if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) { 852 tprints("[????????] "); 853 return; 854 } 855 tprintf("[%08lx] ", pc); 856#elif defined(MIPS) 857 long pc; 858 if (upeek(tcp->pid, REG_EPC, &pc) < 0) { 859 tprints("[????????] "); 860 return; 861 } 862 tprintf("[%08lx] ", pc); 863#elif defined(SH) 864 long pc; 865 if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) { 866 tprints("[????????] "); 867 return; 868 } 869 tprintf("[%08lx] ", pc); 870#elif defined(SH64) 871 long pc; 872 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 873 tprints("[????????????????] "); 874 return; 875 } 876 tprintf("[%08lx] ", pc); 877#elif defined(ARM) 878 tprintf("[%08lx] ", arm_regs.ARM_pc); 879#elif defined(AARCH64) 880 /* tprintf("[%016lx] ", aarch64_regs.regs[???]); */ 881#elif defined(AVR32) 882 tprintf("[%08lx] ", avr32_regs.pc); 883#elif defined(BFIN) 884 long pc; 885 if (upeek(tcp->pid, PT_PC, &pc) < 0) { 886 PRINTBADPC; 887 return; 888 } 889 tprintf("[%08lx] ", pc); 890#elif defined(CRISV10) 891 long pc; 892 if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) { 893 PRINTBADPC; 894 return; 895 } 896 tprintf("[%08lx] ", pc); 897#elif defined(CRISV32) 898 long pc; 899 if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) { 900 PRINTBADPC; 901 return; 902 } 903 tprintf("[%08lx] ", pc); 904#elif defined(TILE) 905# ifdef _LP64 906 tprintf("[%016lx] ", (unsigned long) tile_regs.pc); 907# else 908 tprintf("[%08lx] ", (unsigned long) tile_regs.pc); 909# endif 910#elif defined(OR1K) 911 tprintf("[%08lx] ", or1k_regs.pc); 912#elif defined(METAG) 913 tprintf("[%08lx] ", metag_regs.pc); 914#elif defined(XTENSA) 915 long pc; 916 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 917 PRINTBADPC; 918 return; 919 } 920 tprintf("[%08lx] ", pc); 921#elif defined(ARC) 922 tprintf("[%08lx] ", arc_regs.efa); 923#endif /* architecture */ 924} 925 926/* Shuffle syscall numbers so that we don't have huge gaps in syscall table. 927 * The shuffling should be reversible: shuffle_scno(shuffle_scno(n)) == n. 928 */ 929#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */ 930static long 931shuffle_scno(unsigned long scno) 932{ 933 if (scno <= ARM_LAST_ORDINARY_SYSCALL) 934 return scno; 935 936 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */ 937 if (scno == 0x000ffff0) 938 return ARM_LAST_ORDINARY_SYSCALL+1; 939 if (scno == ARM_LAST_ORDINARY_SYSCALL+1) 940 return 0x000ffff0; 941 942 /* Is it ARM specific syscall? 943 * Swap with [LAST_ORDINARY+2, LAST_ORDINARY+2 + LAST_SPECIAL] range. 944 */ 945 if (scno >= 0x000f0000 946 && scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL 947 ) { 948 return scno - 0x000f0000 + (ARM_LAST_ORDINARY_SYSCALL+2); 949 } 950 if (/* scno >= ARM_LAST_ORDINARY_SYSCALL+2 - always true */ 1 951 && scno <= (ARM_LAST_ORDINARY_SYSCALL+2) + ARM_LAST_SPECIAL_SYSCALL 952 ) { 953 return scno + 0x000f0000 - (ARM_LAST_ORDINARY_SYSCALL+2); 954 } 955 956 return scno; 957} 958#else 959# define shuffle_scno(scno) ((long)(scno)) 960#endif 961 962static char* 963undefined_scno_name(struct tcb *tcp) 964{ 965 static char buf[sizeof("syscall_%lu") + sizeof(long)*3]; 966 967 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno)); 968 return buf; 969} 970 971#ifdef POWERPC 972/* 973 * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23, 974 * we provide a slow fallback for old kernels. 975 */ 976static int powerpc_getregs_old(pid_t pid) 977{ 978 int i; 979 long r; 980 981 if (iflag) { 982 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip); 983 if (r) 984 goto out; 985 } 986#ifdef POWERPC64 /* else we never use it */ 987 r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr); 988 if (r) 989 goto out; 990#endif 991 r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr); 992 if (r) 993 goto out; 994 r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3); 995 if (r) 996 goto out; 997 for (i = 0; i <= 8; i++) { 998 r = upeek(pid, sizeof(long) * (PT_R0 + i), 999 (long *)&ppc_regs.gpr[i]); 1000 if (r) 1001 goto out; 1002 } 1003 out: 1004 return r; 1005} 1006#endif 1007 1008#ifndef get_regs 1009long get_regs_error; 1010 1011#if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS) 1012static void get_regset(pid_t pid) 1013{ 1014/* constant iovec */ 1015# if defined(ARM) \ 1016 || defined(I386) \ 1017 || defined(METAG) \ 1018 || defined(OR1K) \ 1019 || defined(ARC) 1020 static struct iovec io = { 1021 .iov_base = &ARCH_REGS_FOR_GETREGSET, 1022 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET) 1023 }; 1024 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io); 1025 1026/* variable iovec */ 1027# elif defined(X86_64) || defined(X32) 1028 /* x86_io.iov_base = &x86_regs_union; - already is */ 1029 x86_io.iov_len = sizeof(x86_regs_union); 1030 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &x86_io); 1031# elif defined(AARCH64) 1032 /* aarch64_io.iov_base = &arm_regs_union; - already is */ 1033 aarch64_io.iov_len = sizeof(arm_regs_union); 1034 get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &aarch64_io); 1035# else 1036# warning both PTRACE_GETREGSET and NT_PRSTATUS are available but not yet used 1037# endif 1038} 1039#endif /* PTRACE_GETREGSET && NT_PRSTATUS */ 1040 1041void 1042get_regs(pid_t pid) 1043{ 1044/* PTRACE_GETREGSET only */ 1045# if defined(METAG) || defined(OR1K) || defined(X32) || defined(AARCH64) || defined(ARC) 1046 get_regset(pid); 1047 1048/* PTRACE_GETREGS only */ 1049# elif defined(AVR32) 1050 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &avr32_regs); 1051# elif defined(TILE) 1052 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &tile_regs); 1053# elif defined(SPARC) || defined(SPARC64) 1054 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&sparc_regs, 0); 1055# elif defined(POWERPC) 1056 static bool old_kernel = 0; 1057 if (old_kernel) 1058 goto old; 1059 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, (long) &ppc_regs); 1060 if (get_regs_error && errno == EIO) { 1061 old_kernel = 1; 1062 old: 1063 get_regs_error = powerpc_getregs_old(pid); 1064 } 1065 1066/* try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS */ 1067# else 1068# if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS) 1069 static int getregset_support; 1070 1071 if (getregset_support >= 0) { 1072 get_regset(pid); 1073 if (getregset_support > 0) 1074 return; 1075 if (get_regs_error >= 0) { 1076 getregset_support = 1; 1077 return; 1078 } 1079 if (errno == EPERM || errno == ESRCH) 1080 return; 1081 getregset_support = -1; 1082 } 1083# endif /* PTRACE_GETREGSET && NT_PRSTATUS */ 1084# if defined(ARM) 1085 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &arm_regs); 1086# elif defined(I386) 1087 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &i386_regs); 1088# elif defined(X86_64) 1089 /* Use old method, with unreliable heuristical detection of 32-bitness. */ 1090 x86_io.iov_len = sizeof(x86_64_regs); 1091 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs); 1092 if (!get_regs_error && x86_64_regs.cs == 0x23) { 1093 x86_io.iov_len = sizeof(i386_regs); 1094 /* 1095 * The order is important: i386_regs and x86_64_regs 1096 * are overlaid in memory! 1097 */ 1098 i386_regs.ebx = x86_64_regs.rbx; 1099 i386_regs.ecx = x86_64_regs.rcx; 1100 i386_regs.edx = x86_64_regs.rdx; 1101 i386_regs.esi = x86_64_regs.rsi; 1102 i386_regs.edi = x86_64_regs.rdi; 1103 i386_regs.ebp = x86_64_regs.rbp; 1104 i386_regs.eax = x86_64_regs.rax; 1105 /* i386_regs.xds = x86_64_regs.ds; unused by strace */ 1106 /* i386_regs.xes = x86_64_regs.es; ditto... */ 1107 /* i386_regs.xfs = x86_64_regs.fs; */ 1108 /* i386_regs.xgs = x86_64_regs.gs; */ 1109 i386_regs.orig_eax = x86_64_regs.orig_rax; 1110 i386_regs.eip = x86_64_regs.rip; 1111 /* i386_regs.xcs = x86_64_regs.cs; */ 1112 /* i386_regs.eflags = x86_64_regs.eflags; */ 1113 i386_regs.esp = x86_64_regs.rsp; 1114 /* i386_regs.xss = x86_64_regs.ss; */ 1115 } 1116# else 1117# error unhandled architecture 1118# endif /* ARM || I386 || X86_64 */ 1119# endif 1120} 1121#endif /* !get_regs */ 1122 1123/* Returns: 1124 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1125 * 1: ok, continue in trace_syscall_entering(). 1126 * other: error, trace_syscall_entering() should print error indicator 1127 * ("????" etc) and bail out. 1128 */ 1129static int 1130get_scno(struct tcb *tcp) 1131{ 1132 long scno = 0; 1133 1134#if defined(S390) || defined(S390X) 1135 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1136 return -1; 1137 1138 if (s390_gpr2 != -ENOSYS) { 1139 /* 1140 * Since kernel version 2.5.44 the scno gets passed in gpr2. 1141 */ 1142 scno = s390_gpr2; 1143 } else { 1144 /* 1145 * Old style of "passing" the scno via the SVC instruction. 1146 */ 1147 long psw; 1148 long opcode, offset_reg, tmp; 1149 void *svc_addr; 1150 static const int gpr_offset[16] = { 1151 PT_GPR0, PT_GPR1, PT_ORIGGPR2, PT_GPR3, 1152 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, 1153 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, 1154 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15 1155 }; 1156 1157 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) 1158 return -1; 1159 errno = 0; 1160 opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0); 1161 if (errno) { 1162 perror_msg("peektext(psw-oneword)"); 1163 return -1; 1164 } 1165 1166 /* 1167 * We have to check if the SVC got executed directly or via an 1168 * EXECUTE instruction. In case of EXECUTE it is necessary to do 1169 * instruction decoding to derive the system call number. 1170 * Unfortunately the opcode sizes of EXECUTE and SVC are differently, 1171 * so that this doesn't work if a SVC opcode is part of an EXECUTE 1172 * opcode. Since there is no way to find out the opcode size this 1173 * is the best we can do... 1174 */ 1175 if ((opcode & 0xff00) == 0x0a00) { 1176 /* SVC opcode */ 1177 scno = opcode & 0xff; 1178 } 1179 else { 1180 /* SVC got executed by EXECUTE instruction */ 1181 1182 /* 1183 * Do instruction decoding of EXECUTE. If you really want to 1184 * understand this, read the Principles of Operations. 1185 */ 1186 svc_addr = (void *) (opcode & 0xfff); 1187 1188 tmp = 0; 1189 offset_reg = (opcode & 0x000f0000) >> 16; 1190 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1191 return -1; 1192 svc_addr += tmp; 1193 1194 tmp = 0; 1195 offset_reg = (opcode & 0x0000f000) >> 12; 1196 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1197 return -1; 1198 svc_addr += tmp; 1199 1200 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0); 1201 if (errno) 1202 return -1; 1203# if defined(S390X) 1204 scno >>= 48; 1205# else 1206 scno >>= 16; 1207# endif 1208 tmp = 0; 1209 offset_reg = (opcode & 0x00f00000) >> 20; 1210 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1211 return -1; 1212 1213 scno = (scno | tmp) & 0xff; 1214 } 1215 } 1216#elif defined(POWERPC) 1217 scno = ppc_regs.gpr[0]; 1218# ifdef POWERPC64 1219 int currpers; 1220 1221 /* 1222 * Check for 64/32 bit mode. 1223 * Embedded implementations covered by Book E extension of PPC use 1224 * bit 0 (CM) of 32-bit Machine state register (MSR). 1225 * Other implementations use bit 0 (SF) of 64-bit MSR. 1226 */ 1227 currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1; 1228 update_personality(tcp, currpers); 1229# endif 1230#elif defined(AVR32) 1231 scno = avr32_regs.r8; 1232#elif defined(BFIN) 1233 if (upeek(tcp->pid, PT_ORIG_P0, &scno)) 1234 return -1; 1235#elif defined(I386) 1236 scno = i386_regs.orig_eax; 1237#elif defined(X86_64) || defined(X32) 1238# ifndef __X32_SYSCALL_BIT 1239# define __X32_SYSCALL_BIT 0x40000000 1240# endif 1241 int currpers; 1242# if 1 1243 /* GETREGSET of NT_PRSTATUS tells us regset size, 1244 * which unambiguously detects i386. 1245 * 1246 * Linux kernel distinguishes x86-64 and x32 processes 1247 * solely by looking at __X32_SYSCALL_BIT: 1248 * arch/x86/include/asm/compat.h::is_x32_task(): 1249 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 1250 * return true; 1251 */ 1252 if (x86_io.iov_len == sizeof(i386_regs)) { 1253 scno = i386_regs.orig_eax; 1254 currpers = 1; 1255 } else { 1256 scno = x86_64_regs.orig_rax; 1257 currpers = 0; 1258 if (scno & __X32_SYSCALL_BIT) { 1259 scno -= __X32_SYSCALL_BIT; 1260 currpers = 2; 1261 } 1262 } 1263# elif 0 1264 /* cs = 0x33 for long mode (native 64 bit and x32) 1265 * cs = 0x23 for compatibility mode (32 bit) 1266 * ds = 0x2b for x32 mode (x86-64 in 32 bit) 1267 */ 1268 scno = x86_64_regs.orig_rax; 1269 switch (x86_64_regs.cs) { 1270 case 0x23: currpers = 1; break; 1271 case 0x33: 1272 if (x86_64_regs.ds == 0x2b) { 1273 currpers = 2; 1274 scno &= ~__X32_SYSCALL_BIT; 1275 } else 1276 currpers = 0; 1277 break; 1278 default: 1279 fprintf(stderr, "Unknown value CS=0x%08X while " 1280 "detecting personality of process " 1281 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid); 1282 currpers = current_personality; 1283 break; 1284 } 1285# elif 0 1286 /* This version analyzes the opcode of a syscall instruction. 1287 * (int 0x80 on i386 vs. syscall on x86-64) 1288 * It works, but is too complicated, and strictly speaking, unreliable. 1289 */ 1290 unsigned long call, rip = x86_64_regs.rip; 1291 /* sizeof(syscall) == sizeof(int 0x80) == 2 */ 1292 rip -= 2; 1293 errno = 0; 1294 call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0); 1295 if (errno) 1296 fprintf(stderr, "ptrace_peektext failed: %s\n", 1297 strerror(errno)); 1298 switch (call & 0xffff) { 1299 /* x86-64: syscall = 0x0f 0x05 */ 1300 case 0x050f: currpers = 0; break; 1301 /* i386: int 0x80 = 0xcd 0x80 */ 1302 case 0x80cd: currpers = 1; break; 1303 default: 1304 currpers = current_personality; 1305 fprintf(stderr, 1306 "Unknown syscall opcode (0x%04X) while " 1307 "detecting personality of process " 1308 "PID=%d\n", (int)call, tcp->pid); 1309 break; 1310 } 1311# endif 1312 1313# ifdef X32 1314 /* If we are built for a x32 system, then personality 0 is x32 1315 * (not x86_64), and stracing of x86_64 apps is not supported. 1316 * Stracing of i386 apps is still supported. 1317 */ 1318 if (currpers == 0) { 1319 fprintf(stderr, "syscall_%lu(...) in unsupported " 1320 "64-bit mode of process PID=%d\n", 1321 scno, tcp->pid); 1322 return 0; 1323 } 1324 currpers &= ~2; /* map 2,1 to 0,1 */ 1325# endif 1326 update_personality(tcp, currpers); 1327#elif defined(IA64) 1328# define IA64_PSR_IS ((long)1 << 34) 1329 long psr; 1330 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1331 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1332 if (ia64_ia32mode) { 1333 if (upeek(tcp->pid, PT_R1, &scno) < 0) 1334 return -1; 1335 } else { 1336 if (upeek(tcp->pid, PT_R15, &scno) < 0) 1337 return -1; 1338 } 1339#elif defined(AARCH64) 1340 switch (aarch64_io.iov_len) { 1341 case sizeof(aarch64_regs): 1342 /* We are in 64-bit mode */ 1343 scno = aarch64_regs.regs[8]; 1344 update_personality(tcp, 1); 1345 break; 1346 case sizeof(arm_regs): 1347 /* We are in 32-bit mode */ 1348 /* Note: we don't support OABI, unlike 32-bit ARM build */ 1349 scno = arm_regs.ARM_r7; 1350 scno = shuffle_scno(scno); 1351 update_personality(tcp, 0); 1352 break; 1353 } 1354#elif defined(ARM) 1355 if (arm_regs.ARM_ip != 0) { 1356 /* It is not a syscall entry */ 1357 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid); 1358 tcp->flags |= TCB_INSYSCALL; 1359 return 0; 1360 } 1361 /* Note: we support only 32-bit CPUs, not 26-bit */ 1362 1363# if !defined(__ARM_EABI__) || ENABLE_ARM_OABI 1364 if (arm_regs.ARM_cpsr & 0x20) 1365 /* Thumb mode */ 1366 goto scno_in_r7; 1367 /* ARM mode */ 1368 /* Check EABI/OABI by examining SVC insn's low 24 bits */ 1369 errno = 0; 1370 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); 1371 if (errno) 1372 return -1; 1373 /* EABI syscall convention? */ 1374 if (scno != 0xef000000) { 1375 /* No, it's OABI */ 1376 if ((scno & 0x0ff00000) != 0x0f900000) { 1377 fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n", 1378 tcp->pid, scno); 1379 return -1; 1380 } 1381 /* Fixup the syscall number */ 1382 scno &= 0x000fffff; 1383 } else { 1384 scno_in_r7: 1385 scno = arm_regs.ARM_r7; 1386 } 1387# else /* __ARM_EABI__ || !ENABLE_ARM_OABI */ 1388 scno = arm_regs.ARM_r7; 1389# endif 1390 scno = shuffle_scno(scno); 1391#elif defined(M68K) 1392 if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0) 1393 return -1; 1394#elif defined(LINUX_MIPSN32) 1395 unsigned long long regs[38]; 1396 1397 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 1398 return -1; 1399 mips_a3 = regs[REG_A3]; 1400 mips_r2 = regs[REG_V0]; 1401 1402 scno = mips_r2; 1403 if (!SCNO_IN_RANGE(scno)) { 1404 if (mips_a3 == 0 || mips_a3 == -1) { 1405 if (debug_flag) 1406 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1407 return 0; 1408 } 1409 } 1410#elif defined(MIPS) 1411 if (upeek(tcp->pid, REG_A3, &mips_a3) < 0) 1412 return -1; 1413 if (upeek(tcp->pid, REG_V0, &scno) < 0) 1414 return -1; 1415 1416 if (!SCNO_IN_RANGE(scno)) { 1417 if (mips_a3 == 0 || mips_a3 == -1) { 1418 if (debug_flag) 1419 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1420 return 0; 1421 } 1422 } 1423#elif defined(ALPHA) 1424 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1425 return -1; 1426 if (upeek(tcp->pid, REG_R0, &scno) < 0) 1427 return -1; 1428 1429 /* 1430 * Do some sanity checks to figure out if it's 1431 * really a syscall entry 1432 */ 1433 if (!SCNO_IN_RANGE(scno)) { 1434 if (alpha_a3 == 0 || alpha_a3 == -1) { 1435 if (debug_flag) 1436 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno); 1437 return 0; 1438 } 1439 } 1440#elif defined(SPARC) || defined(SPARC64) 1441 /* Disassemble the syscall trap. */ 1442 /* Retrieve the syscall trap instruction. */ 1443 unsigned long trap; 1444 errno = 0; 1445# if defined(SPARC64) 1446 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0); 1447 trap >>= 32; 1448# else 1449 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0); 1450# endif 1451 if (errno) 1452 return -1; 1453 1454 /* Disassemble the trap to see what personality to use. */ 1455 switch (trap) { 1456 case 0x91d02010: 1457 /* Linux/SPARC syscall trap. */ 1458 update_personality(tcp, 0); 1459 break; 1460 case 0x91d0206d: 1461 /* Linux/SPARC64 syscall trap. */ 1462 update_personality(tcp, 2); 1463 break; 1464 case 0x91d02000: 1465 /* SunOS syscall trap. (pers 1) */ 1466 fprintf(stderr, "syscall: SunOS no support\n"); 1467 return -1; 1468 case 0x91d02008: 1469 /* Solaris 2.x syscall trap. (per 2) */ 1470 update_personality(tcp, 1); 1471 break; 1472 case 0x91d02009: 1473 /* NetBSD/FreeBSD syscall trap. */ 1474 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n"); 1475 return -1; 1476 case 0x91d02027: 1477 /* Solaris 2.x gettimeofday */ 1478 update_personality(tcp, 1); 1479 break; 1480 default: 1481# if defined(SPARC64) 1482 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc); 1483# else 1484 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc); 1485# endif 1486 return -1; 1487 } 1488 1489 /* Extract the system call number from the registers. */ 1490 if (trap == 0x91d02027) 1491 scno = 156; 1492 else 1493 scno = sparc_regs.u_regs[U_REG_G1]; 1494 if (scno == 0) { 1495 scno = sparc_regs.u_regs[U_REG_O0]; 1496 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0])); 1497 } 1498#elif defined(HPPA) 1499 if (upeek(tcp->pid, PT_GR20, &scno) < 0) 1500 return -1; 1501#elif defined(SH) 1502 /* 1503 * In the new syscall ABI, the system call number is in R3. 1504 */ 1505 if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0) 1506 return -1; 1507 1508 if (scno < 0) { 1509 /* Odd as it may seem, a glibc bug has been known to cause 1510 glibc to issue bogus negative syscall numbers. So for 1511 our purposes, make strace print what it *should* have been */ 1512 long correct_scno = (scno & 0xff); 1513 if (debug_flag) 1514 fprintf(stderr, 1515 "Detected glibc bug: bogus system call" 1516 " number = %ld, correcting to %ld\n", 1517 scno, 1518 correct_scno); 1519 scno = correct_scno; 1520 } 1521#elif defined(SH64) 1522 if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0) 1523 return -1; 1524 scno &= 0xFFFF; 1525#elif defined(CRISV10) || defined(CRISV32) 1526 if (upeek(tcp->pid, 4*PT_R9, &scno) < 0) 1527 return -1; 1528#elif defined(TILE) 1529 int currpers; 1530 scno = tile_regs.regs[10]; 1531# ifdef __tilepro__ 1532 currpers = 1; 1533# else 1534# ifndef PT_FLAGS_COMPAT 1535# define PT_FLAGS_COMPAT 0x10000 /* from Linux 3.8 on */ 1536# endif 1537 if (tile_regs.flags & PT_FLAGS_COMPAT) 1538 currpers = 1; 1539 else 1540 currpers = 0; 1541# endif 1542 update_personality(tcp, currpers); 1543#elif defined(MICROBLAZE) 1544 if (upeek(tcp->pid, 0, &scno) < 0) 1545 return -1; 1546#elif defined(OR1K) 1547 scno = or1k_regs.gpr[11]; 1548#elif defined(METAG) 1549 scno = metag_regs.dx[0][1]; /* syscall number in D1Re0 (D1.0) */ 1550#elif defined(XTENSA) 1551 if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0) 1552 return -1; 1553# elif defined(ARC) 1554 scno = arc_regs.scratch.r8; 1555#endif 1556 1557 tcp->scno = scno; 1558 if (SCNO_IS_VALID(tcp->scno)) { 1559 tcp->s_ent = &sysent[scno]; 1560 tcp->qual_flg = qual_flags[scno]; 1561 } else { 1562 static const struct_sysent unknown = { 1563 .nargs = MAX_ARGS, 1564 .sys_flags = 0, 1565 .sys_func = printargs, 1566 .sys_name = "unknown", /* not used */ 1567 }; 1568 tcp->s_ent = &unknown; 1569 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS; 1570 } 1571 return 1; 1572} 1573 1574/* Called at each syscall entry. 1575 * Returns: 1576 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1577 * 1: ok, continue in trace_syscall_entering(). 1578 * other: error, trace_syscall_entering() should print error indicator 1579 * ("????" etc) and bail out. 1580 */ 1581static int 1582syscall_fixup_on_sysenter(struct tcb *tcp) 1583{ 1584 /* A common case of "not a syscall entry" is post-execve SIGTRAP */ 1585#if defined(I386) 1586 if (i386_regs.eax != -ENOSYS) { 1587 if (debug_flag) 1588 fprintf(stderr, "not a syscall entry (eax = %ld)\n", i386_regs.eax); 1589 return 0; 1590 } 1591#elif defined(X86_64) || defined(X32) 1592 { 1593 long rax; 1594 if (x86_io.iov_len == sizeof(i386_regs)) { 1595 /* Sign extend from 32 bits */ 1596 rax = (int32_t)i386_regs.eax; 1597 } else { 1598 /* Note: in X32 build, this truncates 64 to 32 bits */ 1599 rax = x86_64_regs.rax; 1600 } 1601 if (rax != -ENOSYS) { 1602 if (debug_flag) 1603 fprintf(stderr, "not a syscall entry (rax = %ld)\n", rax); 1604 return 0; 1605 } 1606 } 1607#elif defined(M68K) 1608 /* TODO? Eliminate upeek's in arches below like we did in x86 */ 1609 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1610 return -1; 1611 if (m68k_d0 != -ENOSYS) { 1612 if (debug_flag) 1613 fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0); 1614 return 0; 1615 } 1616#elif defined(IA64) 1617 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1618 return -1; 1619 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1620 return -1; 1621 if (ia64_ia32mode && ia64_r8 != -ENOSYS) { 1622 if (debug_flag) 1623 fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8); 1624 return 0; 1625 } 1626#elif defined(CRISV10) || defined(CRISV32) 1627 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1628 return -1; 1629 if (cris_r10 != -ENOSYS) { 1630 if (debug_flag) 1631 fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10); 1632 return 0; 1633 } 1634#elif defined(MICROBLAZE) 1635 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1636 return -1; 1637 if (microblaze_r3 != -ENOSYS) { 1638 if (debug_flag) 1639 fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3); 1640 return 0; 1641 } 1642#endif 1643 return 1; 1644} 1645 1646static void 1647internal_fork(struct tcb *tcp) 1648{ 1649#if defined S390 || defined S390X || defined CRISV10 || defined CRISV32 1650# define ARG_FLAGS 1 1651#else 1652# define ARG_FLAGS 0 1653#endif 1654#ifndef CLONE_UNTRACED 1655# define CLONE_UNTRACED 0x00800000 1656#endif 1657 if ((ptrace_setoptions 1658 & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1659 == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1660 return; 1661 1662 if (!followfork) 1663 return; 1664 1665 if (entering(tcp)) { 1666 /* 1667 * We won't see the new child if clone is called with 1668 * CLONE_UNTRACED, so we keep the same logic with that option 1669 * and don't trace it. 1670 */ 1671 if ((tcp->s_ent->sys_func == sys_clone) 1672 && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED) 1673 ) 1674 return; 1675 setbpt(tcp); 1676 } else { 1677 if (tcp->flags & TCB_BPTSET) 1678 clearbpt(tcp); 1679 } 1680} 1681 1682#if defined(TCB_WAITEXECVE) 1683static void 1684internal_exec(struct tcb *tcp) 1685{ 1686 /* Maybe we have post-execve SIGTRAP suppressed? */ 1687 if (ptrace_setoptions & PTRACE_O_TRACEEXEC) 1688 return; /* yes, no need to do anything */ 1689 1690 if (exiting(tcp) && syserror(tcp)) 1691 /* Error in execve, no post-execve SIGTRAP expected */ 1692 tcp->flags &= ~TCB_WAITEXECVE; 1693 else 1694 tcp->flags |= TCB_WAITEXECVE; 1695} 1696#endif 1697 1698static void 1699syscall_fixup_for_fork_exec(struct tcb *tcp) 1700{ 1701 /* 1702 * We must always trace a few critical system calls in order to 1703 * correctly support following forks in the presence of tracing 1704 * qualifiers. 1705 */ 1706 int (*func)(); 1707 1708 func = tcp->s_ent->sys_func; 1709 1710 if ( sys_fork == func 1711 || sys_clone == func 1712 ) { 1713 internal_fork(tcp); 1714 return; 1715 } 1716 1717#if defined(TCB_WAITEXECVE) 1718 if ( sys_execve == func 1719# if defined(SPARC) || defined(SPARC64) 1720 || sys_execv == func 1721# endif 1722 ) { 1723 internal_exec(tcp); 1724 return; 1725 } 1726#endif 1727} 1728 1729/* Return -1 on error or 1 on success (never 0!) */ 1730static int 1731get_syscall_args(struct tcb *tcp) 1732{ 1733 int i, nargs; 1734 1735 nargs = tcp->s_ent->nargs; 1736 1737#if defined(S390) || defined(S390X) 1738 for (i = 0; i < nargs; ++i) 1739 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0) 1740 return -1; 1741#elif defined(ALPHA) 1742 for (i = 0; i < nargs; ++i) 1743 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1744 return -1; 1745#elif defined(IA64) 1746 if (!ia64_ia32mode) { 1747 unsigned long *out0, cfm, sof, sol; 1748 long rbs_end; 1749 /* be backwards compatible with kernel < 2.4.4... */ 1750# ifndef PT_RBS_END 1751# define PT_RBS_END PT_AR_BSP 1752# endif 1753 1754 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1755 return -1; 1756 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1757 return -1; 1758 1759 sof = (cfm >> 0) & 0x7f; 1760 sol = (cfm >> 7) & 0x7f; 1761 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1762 1763 for (i = 0; i < nargs; ++i) { 1764 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1765 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1766 return -1; 1767 } 1768 } else { 1769 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1770 PT_R9 /* ECX = out1 */, 1771 PT_R10 /* EDX = out2 */, 1772 PT_R14 /* ESI = out3 */, 1773 PT_R15 /* EDI = out4 */, 1774 PT_R13 /* EBP = out5 */}; 1775 1776 for (i = 0; i < nargs; ++i) { 1777 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1778 return -1; 1779 /* truncate away IVE sign-extension */ 1780 tcp->u_arg[i] &= 0xffffffff; 1781 } 1782 } 1783#elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64) 1784 /* N32 and N64 both use up to six registers. */ 1785 unsigned long long regs[38]; 1786 1787 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 1788 return -1; 1789 1790 for (i = 0; i < nargs; ++i) { 1791 tcp->u_arg[i] = regs[REG_A0 + i]; 1792# if defined(LINUX_MIPSN32) 1793 tcp->ext_arg[i] = regs[REG_A0 + i]; 1794# endif 1795 } 1796#elif defined(MIPS) 1797 if (nargs > 4) { 1798 long sp; 1799 1800 if (upeek(tcp->pid, REG_SP, &sp) < 0) 1801 return -1; 1802 for (i = 0; i < 4; ++i) 1803 if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0) 1804 return -1; 1805 umoven(tcp, sp + 16, (nargs - 4) * sizeof(tcp->u_arg[0]), 1806 (char *)(tcp->u_arg + 4)); 1807 } else { 1808 for (i = 0; i < nargs; ++i) 1809 if (upeek(tcp->pid, REG_A0 + i, &tcp->u_arg[i]) < 0) 1810 return -1; 1811 } 1812#elif defined(POWERPC) 1813 (void)i; 1814 (void)nargs; 1815 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1816 tcp->u_arg[1] = ppc_regs.gpr[4]; 1817 tcp->u_arg[2] = ppc_regs.gpr[5]; 1818 tcp->u_arg[3] = ppc_regs.gpr[6]; 1819 tcp->u_arg[4] = ppc_regs.gpr[7]; 1820 tcp->u_arg[5] = ppc_regs.gpr[8]; 1821#elif defined(SPARC) || defined(SPARC64) 1822 for (i = 0; i < nargs; ++i) 1823 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1824#elif defined(HPPA) 1825 for (i = 0; i < nargs; ++i) 1826 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1827 return -1; 1828#elif defined(ARM) || defined(AARCH64) 1829# if defined(AARCH64) 1830 if (tcp->currpers == 1) 1831 for (i = 0; i < nargs; ++i) 1832 tcp->u_arg[i] = aarch64_regs.regs[i]; 1833 else 1834# endif 1835 for (i = 0; i < nargs; ++i) 1836 tcp->u_arg[i] = arm_regs.uregs[i]; 1837#elif defined(AVR32) 1838 (void)i; 1839 (void)nargs; 1840 tcp->u_arg[0] = avr32_regs.r12; 1841 tcp->u_arg[1] = avr32_regs.r11; 1842 tcp->u_arg[2] = avr32_regs.r10; 1843 tcp->u_arg[3] = avr32_regs.r9; 1844 tcp->u_arg[4] = avr32_regs.r5; 1845 tcp->u_arg[5] = avr32_regs.r3; 1846#elif defined(BFIN) 1847 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1848 1849 for (i = 0; i < nargs; ++i) 1850 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1851 return -1; 1852#elif defined(SH) 1853 static const int syscall_regs[MAX_ARGS] = { 1854 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1855 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1856 }; 1857 1858 for (i = 0; i < nargs; ++i) 1859 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1860 return -1; 1861#elif defined(SH64) 1862 int i; 1863 /* Registers used by SH5 Linux system calls for parameters */ 1864 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1865 1866 for (i = 0; i < nargs; ++i) 1867 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1868 return -1; 1869#elif defined(I386) 1870 (void)i; 1871 (void)nargs; 1872 tcp->u_arg[0] = i386_regs.ebx; 1873 tcp->u_arg[1] = i386_regs.ecx; 1874 tcp->u_arg[2] = i386_regs.edx; 1875 tcp->u_arg[3] = i386_regs.esi; 1876 tcp->u_arg[4] = i386_regs.edi; 1877 tcp->u_arg[5] = i386_regs.ebp; 1878#elif defined(X86_64) || defined(X32) 1879 (void)i; 1880 (void)nargs; 1881 if (x86_io.iov_len != sizeof(i386_regs)) { 1882 /* x86-64 or x32 ABI */ 1883 tcp->u_arg[0] = x86_64_regs.rdi; 1884 tcp->u_arg[1] = x86_64_regs.rsi; 1885 tcp->u_arg[2] = x86_64_regs.rdx; 1886 tcp->u_arg[3] = x86_64_regs.r10; 1887 tcp->u_arg[4] = x86_64_regs.r8; 1888 tcp->u_arg[5] = x86_64_regs.r9; 1889# ifdef X32 1890 tcp->ext_arg[0] = x86_64_regs.rdi; 1891 tcp->ext_arg[1] = x86_64_regs.rsi; 1892 tcp->ext_arg[2] = x86_64_regs.rdx; 1893 tcp->ext_arg[3] = x86_64_regs.r10; 1894 tcp->ext_arg[4] = x86_64_regs.r8; 1895 tcp->ext_arg[5] = x86_64_regs.r9; 1896# endif 1897 } else { 1898 /* i386 ABI */ 1899 /* Zero-extend from 32 bits */ 1900 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1901 * if you need to use *sign-extended* parameter. 1902 */ 1903 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1904 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1905 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1906 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1907 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1908 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1909 } 1910#elif defined(MICROBLAZE) 1911 for (i = 0; i < nargs; ++i) 1912 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1913 return -1; 1914#elif defined(CRISV10) || defined(CRISV32) 1915 static const int crisregs[MAX_ARGS] = { 1916 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1917 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1918 }; 1919 1920 for (i = 0; i < nargs; ++i) 1921 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1922 return -1; 1923#elif defined(TILE) 1924 for (i = 0; i < nargs; ++i) 1925 tcp->u_arg[i] = tile_regs.regs[i]; 1926#elif defined(M68K) 1927 for (i = 0; i < nargs; ++i) 1928 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1929 return -1; 1930#elif defined(OR1K) 1931 (void)nargs; 1932 for (i = 0; i < 6; ++i) 1933 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1934#elif defined(METAG) 1935 for (i = 0; i < nargs; i++) 1936 /* arguments go backwards from D1Ar1 (D1.3) */ 1937 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1938#elif defined(XTENSA) 1939 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1940 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1941 for (i = 0; i < nargs; ++i) 1942 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1943 return -1; 1944# elif defined(ARC) 1945 long *arc_args = &arc_regs.scratch.r0; 1946 for (i = 0; i < nargs; ++i) 1947 tcp->u_arg[i] = *arc_args--; 1948 1949#else /* Other architecture (32bits specific) */ 1950 for (i = 0; i < nargs; ++i) 1951 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 1952 return -1; 1953#endif 1954 return 1; 1955} 1956 1957static int 1958trace_syscall_entering(struct tcb *tcp) 1959{ 1960 int res, scno_good; 1961 1962#if defined TCB_WAITEXECVE 1963 if (tcp->flags & TCB_WAITEXECVE) { 1964 /* This is the post-execve SIGTRAP. */ 1965 tcp->flags &= ~TCB_WAITEXECVE; 1966 return 0; 1967 } 1968#endif 1969 1970 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 1971 if (res == 0) 1972 return res; 1973 if (res == 1) { 1974 res = syscall_fixup_on_sysenter(tcp); 1975 if (res == 0) 1976 return res; 1977 if (res == 1) 1978 res = get_syscall_args(tcp); 1979 } 1980 1981 if (res != 1) { 1982 printleader(tcp); 1983 if (scno_good != 1) 1984 tprints("????" /* anti-trigraph gap */ "("); 1985 else if (tcp->qual_flg & UNDEFINED_SCNO) 1986 tprintf("%s(", undefined_scno_name(tcp)); 1987 else 1988 tprintf("%s(", tcp->s_ent->sys_name); 1989 /* 1990 * " <unavailable>" will be added later by the code which 1991 * detects ptrace errors. 1992 */ 1993 goto ret; 1994 } 1995 1996 if ( sys_execve == tcp->s_ent->sys_func 1997# if defined(SPARC) || defined(SPARC64) 1998 || sys_execv == tcp->s_ent->sys_func 1999# endif 2000 ) { 2001 hide_log_until_execve = 0; 2002 } 2003 2004#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 2005 while (1) { 2006# ifdef SYS_socket_subcall 2007 if (tcp->s_ent->sys_func == sys_socketcall) { 2008 decode_socket_subcall(tcp); 2009 break; 2010 } 2011# endif 2012# ifdef SYS_ipc_subcall 2013 if (tcp->s_ent->sys_func == sys_ipc) { 2014 decode_ipc_subcall(tcp); 2015 break; 2016 } 2017# endif 2018 break; 2019 } 2020#endif 2021 2022 if (need_fork_exec_workarounds) 2023 syscall_fixup_for_fork_exec(tcp); 2024 2025 if (!(tcp->qual_flg & QUAL_TRACE) 2026 || (tracing_paths && !pathtrace_match(tcp)) 2027 ) { 2028 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 2029 return 0; 2030 } 2031 2032 tcp->flags &= ~TCB_FILTERED; 2033 2034 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 2035 res = 0; 2036 goto ret; 2037 } 2038 2039 printleader(tcp); 2040 if (tcp->qual_flg & UNDEFINED_SCNO) 2041 tprintf("%s(", undefined_scno_name(tcp)); 2042 else 2043 tprintf("%s(", tcp->s_ent->sys_name); 2044 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 2045 res = printargs(tcp); 2046 else 2047 res = tcp->s_ent->sys_func(tcp); 2048 2049 fflush(tcp->outf); 2050 ret: 2051 tcp->flags |= TCB_INSYSCALL; 2052 /* Measure the entrance time as late as possible to avoid errors. */ 2053 if (Tflag || cflag) 2054 gettimeofday(&tcp->etime, NULL); 2055 return res; 2056} 2057 2058/* Returns: 2059 * 1: ok, continue in trace_syscall_exiting(). 2060 * -1: error, trace_syscall_exiting() should print error indicator 2061 * ("????" etc) and bail out. 2062 */ 2063static int 2064get_syscall_result(struct tcb *tcp) 2065{ 2066#if defined(S390) || defined(S390X) 2067 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 2068 return -1; 2069#elif defined(POWERPC) 2070 /* already done by get_regs */ 2071#elif defined(AVR32) 2072 /* already done by get_regs */ 2073#elif defined(BFIN) 2074 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 2075 return -1; 2076#elif defined(I386) 2077 /* already done by get_regs */ 2078#elif defined(X86_64) || defined(X32) 2079 /* already done by get_regs */ 2080#elif defined(IA64) 2081# define IA64_PSR_IS ((long)1 << 34) 2082 long psr; 2083 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 2084 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 2085 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 2086 return -1; 2087 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 2088 return -1; 2089#elif defined(ARM) 2090 /* already done by get_regs */ 2091#elif defined(AARCH64) 2092 /* register reading already done by get_regs */ 2093 2094 /* Used to do this, but we did it on syscall entry already: */ 2095 /* We are in 64-bit mode (personality 1) if register struct is aarch64_regs, 2096 * else it's personality 0. 2097 */ 2098 /*update_personality(tcp, aarch64_io.iov_len == sizeof(aarch64_regs));*/ 2099#elif defined(M68K) 2100 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 2101 return -1; 2102#elif defined(LINUX_MIPSN32) 2103 unsigned long long regs[38]; 2104 2105 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) ®s) < 0) 2106 return -1; 2107 mips_a3 = regs[REG_A3]; 2108 mips_r2 = regs[REG_V0]; 2109#elif defined(MIPS) 2110 if (upeek(tcp->pid, REG_A3, &mips_a3) < 0) 2111 return -1; 2112 if (upeek(tcp->pid, REG_V0, &mips_r2) < 0) 2113 return -1; 2114#elif defined(ALPHA) 2115 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 2116 return -1; 2117 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 2118 return -1; 2119#elif defined(SPARC) || defined(SPARC64) 2120 /* already done by get_regs */ 2121#elif defined(HPPA) 2122 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 2123 return -1; 2124#elif defined(SH) 2125 /* new syscall ABI returns result in R0 */ 2126 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 2127 return -1; 2128#elif defined(SH64) 2129 /* ABI defines result returned in r9 */ 2130 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 2131 return -1; 2132#elif defined(CRISV10) || defined(CRISV32) 2133 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 2134 return -1; 2135#elif defined(TILE) 2136 /* already done by get_regs */ 2137#elif defined(MICROBLAZE) 2138 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 2139 return -1; 2140#elif defined(OR1K) 2141 /* already done by get_regs */ 2142#elif defined(METAG) 2143 /* already done by get_regs */ 2144#elif defined(XTENSA) 2145 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 2146 return -1; 2147#elif defined(ARC) 2148 /* already done by get_regs */ 2149#endif 2150 return 1; 2151} 2152 2153/* Called at each syscall exit */ 2154static void 2155syscall_fixup_on_sysexit(struct tcb *tcp) 2156{ 2157#if defined(S390) || defined(S390X) 2158 if ((tcp->flags & TCB_WAITEXECVE) 2159 && (s390_gpr2 == -ENOSYS || s390_gpr2 == tcp->scno)) { 2160 /* 2161 * Return from execve. 2162 * Fake a return value of zero. We leave the TCB_WAITEXECVE 2163 * flag set for the post-execve SIGTRAP to see and reset. 2164 */ 2165 s390_gpr2 = 0; 2166 } 2167#endif 2168} 2169 2170/* 2171 * Check the syscall return value register value for whether it is 2172 * a negated errno code indicating an error, or a success return value. 2173 */ 2174static inline int 2175is_negated_errno(unsigned long int val) 2176{ 2177 unsigned long int max = -(long int) nerrnos; 2178#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 2179 if (current_wordsize < sizeof(val)) { 2180 val = (unsigned int) val; 2181 max = (unsigned int) max; 2182 } 2183#endif 2184 return val > max; 2185} 2186 2187#if defined(X32) 2188static inline int 2189is_negated_errno_x32(unsigned long long val) 2190{ 2191 unsigned long long max = -(long long) nerrnos; 2192 /* 2193 * current_wordsize is 4 even in personality 0 (native X32) 2194 * but truncation _must not_ be done in it. 2195 * can't check current_wordsize here! 2196 */ 2197 if (current_personality != 0) { 2198 val = (uint32_t) val; 2199 max = (uint32_t) max; 2200 } 2201 return val > max; 2202} 2203#endif 2204 2205/* Returns: 2206 * 1: ok, continue in trace_syscall_exiting(). 2207 * -1: error, trace_syscall_exiting() should print error indicator 2208 * ("????" etc) and bail out. 2209 */ 2210static void 2211get_error(struct tcb *tcp) 2212{ 2213 int u_error = 0; 2214 int check_errno = 1; 2215 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 2216 check_errno = 0; 2217 } 2218#if defined(S390) || defined(S390X) 2219 if (check_errno && is_negated_errno(s390_gpr2)) { 2220 tcp->u_rval = -1; 2221 u_error = -s390_gpr2; 2222 } 2223 else { 2224 tcp->u_rval = s390_gpr2; 2225 } 2226#elif defined(I386) 2227 if (check_errno && is_negated_errno(i386_regs.eax)) { 2228 tcp->u_rval = -1; 2229 u_error = -i386_regs.eax; 2230 } 2231 else { 2232 tcp->u_rval = i386_regs.eax; 2233 } 2234#elif defined(X86_64) 2235 long rax; 2236 if (x86_io.iov_len == sizeof(i386_regs)) { 2237 /* Sign extend from 32 bits */ 2238 rax = (int32_t)i386_regs.eax; 2239 } else { 2240 rax = x86_64_regs.rax; 2241 } 2242 if (check_errno && is_negated_errno(rax)) { 2243 tcp->u_rval = -1; 2244 u_error = -rax; 2245 } 2246 else { 2247 tcp->u_rval = rax; 2248 } 2249#elif defined(X32) 2250 /* In X32, return value is 64-bit (llseek uses one). 2251 * Using merely "long rax" would not work. 2252 */ 2253 long long rax; 2254 if (x86_io.iov_len == sizeof(i386_regs)) { 2255 /* Sign extend from 32 bits */ 2256 rax = (int32_t)i386_regs.eax; 2257 } else { 2258 rax = x86_64_regs.rax; 2259 } 2260 /* Careful: is_negated_errno() works only on longs */ 2261 if (check_errno && is_negated_errno_x32(rax)) { 2262 tcp->u_rval = -1; 2263 u_error = -rax; 2264 } 2265 else { 2266 tcp->u_rval = rax; /* truncating */ 2267 tcp->u_lrval = rax; 2268 } 2269#elif defined(IA64) 2270 if (ia64_ia32mode) { 2271 int err; 2272 2273 err = (int)ia64_r8; 2274 if (check_errno && is_negated_errno(err)) { 2275 tcp->u_rval = -1; 2276 u_error = -err; 2277 } 2278 else { 2279 tcp->u_rval = err; 2280 } 2281 } else { 2282 if (check_errno && ia64_r10) { 2283 tcp->u_rval = -1; 2284 u_error = ia64_r8; 2285 } else { 2286 tcp->u_rval = ia64_r8; 2287 } 2288 } 2289#elif defined(MIPS) 2290 if (check_errno && mips_a3) { 2291 tcp->u_rval = -1; 2292 u_error = mips_r2; 2293 } else { 2294 tcp->u_rval = mips_r2; 2295# if defined(LINUX_MIPSN32) 2296 tcp->u_lrval = mips_r2; 2297# endif 2298 } 2299#elif defined(POWERPC) 2300 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2301 tcp->u_rval = -1; 2302 u_error = ppc_regs.gpr[3]; 2303 } 2304 else { 2305 tcp->u_rval = ppc_regs.gpr[3]; 2306 } 2307#elif defined(M68K) 2308 if (check_errno && is_negated_errno(m68k_d0)) { 2309 tcp->u_rval = -1; 2310 u_error = -m68k_d0; 2311 } 2312 else { 2313 tcp->u_rval = m68k_d0; 2314 } 2315#elif defined(ARM) || defined(AARCH64) 2316# if defined(AARCH64) 2317 if (tcp->currpers == 1) { 2318 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2319 tcp->u_rval = -1; 2320 u_error = -aarch64_regs.regs[0]; 2321 } 2322 else { 2323 tcp->u_rval = aarch64_regs.regs[0]; 2324 } 2325 } 2326 else 2327# endif 2328 { 2329 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2330 tcp->u_rval = -1; 2331 u_error = -arm_regs.ARM_r0; 2332 } 2333 else { 2334 tcp->u_rval = arm_regs.ARM_r0; 2335 } 2336 } 2337#elif defined(AVR32) 2338 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2339 tcp->u_rval = -1; 2340 u_error = -avr32_regs.r12; 2341 } 2342 else { 2343 tcp->u_rval = avr32_regs.r12; 2344 } 2345#elif defined(BFIN) 2346 if (check_errno && is_negated_errno(bfin_r0)) { 2347 tcp->u_rval = -1; 2348 u_error = -bfin_r0; 2349 } else { 2350 tcp->u_rval = bfin_r0; 2351 } 2352#elif defined(ALPHA) 2353 if (check_errno && alpha_a3) { 2354 tcp->u_rval = -1; 2355 u_error = alpha_r0; 2356 } 2357 else { 2358 tcp->u_rval = alpha_r0; 2359 } 2360#elif defined(SPARC) 2361 if (check_errno && sparc_regs.psr & PSR_C) { 2362 tcp->u_rval = -1; 2363 u_error = sparc_regs.u_regs[U_REG_O0]; 2364 } 2365 else { 2366 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2367 } 2368#elif defined(SPARC64) 2369 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2370 tcp->u_rval = -1; 2371 u_error = sparc_regs.u_regs[U_REG_O0]; 2372 } 2373 else { 2374 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2375 } 2376#elif defined(HPPA) 2377 if (check_errno && is_negated_errno(hppa_r28)) { 2378 tcp->u_rval = -1; 2379 u_error = -hppa_r28; 2380 } 2381 else { 2382 tcp->u_rval = hppa_r28; 2383 } 2384#elif defined(SH) 2385 if (check_errno && is_negated_errno(sh_r0)) { 2386 tcp->u_rval = -1; 2387 u_error = -sh_r0; 2388 } 2389 else { 2390 tcp->u_rval = sh_r0; 2391 } 2392#elif defined(SH64) 2393 if (check_errno && is_negated_errno(sh64_r9)) { 2394 tcp->u_rval = -1; 2395 u_error = -sh64_r9; 2396 } 2397 else { 2398 tcp->u_rval = sh64_r9; 2399 } 2400#elif defined(METAG) 2401 /* result pointer in D0Re0 (D0.0) */ 2402 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2403 tcp->u_rval = -1; 2404 u_error = -metag_regs.dx[0][0]; 2405 } 2406 else { 2407 tcp->u_rval = metag_regs.dx[0][0]; 2408 } 2409#elif defined(CRISV10) || defined(CRISV32) 2410 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2411 tcp->u_rval = -1; 2412 u_error = -cris_r10; 2413 } 2414 else { 2415 tcp->u_rval = cris_r10; 2416 } 2417#elif defined(TILE) 2418 /* 2419 * The standard tile calling convention returns the value (or negative 2420 * errno) in r0, and zero (or positive errno) in r1. 2421 * Until at least kernel 3.8, however, the r1 value is not reflected 2422 * in ptregs at this point, so we use r0 here. 2423 */ 2424 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2425 tcp->u_rval = -1; 2426 u_error = -tile_regs.regs[0]; 2427 } else { 2428 tcp->u_rval = tile_regs.regs[0]; 2429 } 2430#elif defined(MICROBLAZE) 2431 if (check_errno && is_negated_errno(microblaze_r3)) { 2432 tcp->u_rval = -1; 2433 u_error = -microblaze_r3; 2434 } 2435 else { 2436 tcp->u_rval = microblaze_r3; 2437 } 2438#elif defined(OR1K) 2439 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2440 tcp->u_rval = -1; 2441 u_error = -or1k_regs.gpr[11]; 2442 } 2443 else { 2444 tcp->u_rval = or1k_regs.gpr[11]; 2445 } 2446#elif defined(XTENSA) 2447 if (check_errno && is_negated_errno(xtensa_a2)) { 2448 tcp->u_rval = -1; 2449 u_error = -xtensa_a2; 2450 } 2451 else { 2452 tcp->u_rval = xtensa_a2; 2453 } 2454#elif defined(ARC) 2455 if (check_errno && is_negated_errno(arc_regs.scratch.r0)) { 2456 tcp->u_rval = -1; 2457 u_error = -arc_regs.scratch.r0; 2458 } 2459 else { 2460 tcp->u_rval = arc_regs.scratch.r0; 2461 } 2462#endif 2463 tcp->u_error = u_error; 2464} 2465 2466static void 2467dumpio(struct tcb *tcp) 2468{ 2469 int (*func)(); 2470 2471 if (syserror(tcp)) 2472 return; 2473 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2474 return; 2475 func = tcp->s_ent->sys_func; 2476 if (func == printargs) 2477 return; 2478 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2479 if (func == sys_read || 2480 func == sys_pread || 2481 func == sys_recv || 2482 func == sys_recvfrom) 2483 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2484 else if (func == sys_readv) 2485 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2486 return; 2487 } 2488 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2489 if (func == sys_write || 2490 func == sys_pwrite || 2491 func == sys_send || 2492 func == sys_sendto) 2493 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2494 else if (func == sys_writev) 2495 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2496 return; 2497 } 2498} 2499 2500static int 2501trace_syscall_exiting(struct tcb *tcp) 2502{ 2503 int sys_res; 2504 struct timeval tv; 2505 int res; 2506 long u_error; 2507 2508 /* Measure the exit time as early as possible to avoid errors. */ 2509 if (Tflag || cflag) 2510 gettimeofday(&tv, NULL); 2511 2512#if SUPPORTED_PERSONALITIES > 1 2513 update_personality(tcp, tcp->currpers); 2514#endif 2515 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2516 if (res == 1) { 2517 syscall_fixup_on_sysexit(tcp); /* never fails */ 2518 get_error(tcp); /* never fails */ 2519 if (need_fork_exec_workarounds) 2520 syscall_fixup_for_fork_exec(tcp); 2521 if (filtered(tcp) || hide_log_until_execve) 2522 goto ret; 2523 } 2524 2525 if (cflag) { 2526 count_syscall(tcp, &tv); 2527 if (cflag == CFLAG_ONLY_STATS) { 2528 goto ret; 2529 } 2530 } 2531 2532 /* If not in -ff mode, and printing_tcp != tcp, 2533 * then the log currently does not end with output 2534 * of _our syscall entry_, but with something else. 2535 * We need to say which syscall's return is this. 2536 * 2537 * Forced reprinting via TCB_REPRINT is used only by 2538 * "strace -ff -oLOG test/threaded_execve" corner case. 2539 * It's the only case when -ff mode needs reprinting. 2540 */ 2541 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2542 tcp->flags &= ~TCB_REPRINT; 2543 printleader(tcp); 2544 if (tcp->qual_flg & UNDEFINED_SCNO) 2545 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2546 else 2547 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2548 } 2549 printing_tcp = tcp; 2550 2551 if (res != 1) { 2552 /* There was error in one of prior ptrace ops */ 2553 tprints(") "); 2554 tabto(); 2555 tprints("= ? <unavailable>\n"); 2556 line_ended(); 2557 tcp->flags &= ~TCB_INSYSCALL; 2558 return res; 2559 } 2560 2561 sys_res = 0; 2562 if (tcp->qual_flg & QUAL_RAW) { 2563 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2564 } else { 2565 /* FIXME: not_failing_only (IOW, option -z) is broken: 2566 * failure of syscall is known only after syscall return. 2567 * Thus we end up with something like this on, say, ENOENT: 2568 * open("doesnt_exist", O_RDONLY <unfinished ...> 2569 * {next syscall decode} 2570 * whereas the intended result is that open(...) line 2571 * is not shown at all. 2572 */ 2573 if (not_failing_only && tcp->u_error) 2574 goto ret; /* ignore failed syscalls */ 2575 sys_res = tcp->s_ent->sys_func(tcp); 2576 } 2577 2578 tprints(") "); 2579 tabto(); 2580 u_error = tcp->u_error; 2581 if (tcp->qual_flg & QUAL_RAW) { 2582 if (u_error) 2583 tprintf("= -1 (errno %ld)", u_error); 2584 else 2585 tprintf("= %#lx", tcp->u_rval); 2586 } 2587 else if (!(sys_res & RVAL_NONE) && u_error) { 2588 switch (u_error) { 2589 /* Blocked signals do not interrupt any syscalls. 2590 * In this case syscalls don't return ERESTARTfoo codes. 2591 * 2592 * Deadly signals set to SIG_DFL interrupt syscalls 2593 * and kill the process regardless of which of the codes below 2594 * is returned by the interrupted syscall. 2595 * In some cases, kernel forces a kernel-generated deadly 2596 * signal to be unblocked and set to SIG_DFL (and thus cause 2597 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2598 * or SIGILL. (The alternative is to leave process spinning 2599 * forever on the faulty instruction - not useful). 2600 * 2601 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2602 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2603 * but kernel will always restart them. 2604 */ 2605 case ERESTARTSYS: 2606 /* Most common type of signal-interrupted syscall exit code. 2607 * The system call will be restarted with the same arguments 2608 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2609 */ 2610 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2611 break; 2612 case ERESTARTNOINTR: 2613 /* Rare. For example, fork() returns this if interrupted. 2614 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2615 */ 2616 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2617 break; 2618 case ERESTARTNOHAND: 2619 /* pause(), rt_sigsuspend() etc use this code. 2620 * SA_RESTART is ignored (assumed not set): 2621 * syscall won't restart (will return EINTR instead) 2622 * even after signal with SA_RESTART set. However, 2623 * after SIG_IGN or SIG_DFL signal it will restart 2624 * (thus the name "restart only if has no handler"). 2625 */ 2626 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2627 break; 2628 case ERESTART_RESTARTBLOCK: 2629 /* Syscalls like nanosleep(), poll() which can't be 2630 * restarted with their original arguments use this 2631 * code. Kernel will execute restart_syscall() instead, 2632 * which changes arguments before restarting syscall. 2633 * SA_RESTART is ignored (assumed not set) similarly 2634 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2635 * since restart data is saved in "restart block" 2636 * in task struct, and if signal handler uses a syscall 2637 * which in turn saves another such restart block, 2638 * old data is lost and restart becomes impossible) 2639 */ 2640 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2641 break; 2642 default: 2643 if (u_error < 0) 2644 tprintf("= -1 E??? (errno %ld)", u_error); 2645 else if (u_error < nerrnos) 2646 tprintf("= -1 %s (%s)", errnoent[u_error], 2647 strerror(u_error)); 2648 else 2649 tprintf("= -1 ERRNO_%ld (%s)", u_error, 2650 strerror(u_error)); 2651 break; 2652 } 2653 if ((sys_res & RVAL_STR) && tcp->auxstr) 2654 tprintf(" (%s)", tcp->auxstr); 2655 } 2656 else { 2657 if (sys_res & RVAL_NONE) 2658 tprints("= ?"); 2659 else { 2660 switch (sys_res & RVAL_MASK) { 2661 case RVAL_HEX: 2662 tprintf("= %#lx", tcp->u_rval); 2663 break; 2664 case RVAL_OCTAL: 2665 tprintf("= %#lo", tcp->u_rval); 2666 break; 2667 case RVAL_UDECIMAL: 2668 tprintf("= %lu", tcp->u_rval); 2669 break; 2670 case RVAL_DECIMAL: 2671 tprintf("= %ld", tcp->u_rval); 2672 break; 2673#if defined(LINUX_MIPSN32) || defined(X32) 2674 /* 2675 case RVAL_LHEX: 2676 tprintf("= %#llx", tcp->u_lrval); 2677 break; 2678 case RVAL_LOCTAL: 2679 tprintf("= %#llo", tcp->u_lrval); 2680 break; 2681 */ 2682 case RVAL_LUDECIMAL: 2683 tprintf("= %llu", tcp->u_lrval); 2684 break; 2685 /* 2686 case RVAL_LDECIMAL: 2687 tprintf("= %lld", tcp->u_lrval); 2688 break; 2689 */ 2690#endif 2691 default: 2692 fprintf(stderr, 2693 "invalid rval format\n"); 2694 break; 2695 } 2696 } 2697 if ((sys_res & RVAL_STR) && tcp->auxstr) 2698 tprintf(" (%s)", tcp->auxstr); 2699 } 2700 if (Tflag) { 2701 tv_sub(&tv, &tv, &tcp->etime); 2702 tprintf(" <%ld.%06ld>", 2703 (long) tv.tv_sec, (long) tv.tv_usec); 2704 } 2705 tprints("\n"); 2706 dumpio(tcp); 2707 line_ended(); 2708 2709#ifdef USE_LIBUNWIND 2710 if (stack_trace_enabled) 2711 unwind_print_stacktrace(tcp); 2712#endif 2713 2714 ret: 2715 tcp->flags &= ~TCB_INSYSCALL; 2716 return 0; 2717} 2718 2719int 2720trace_syscall(struct tcb *tcp) 2721{ 2722 return exiting(tcp) ? 2723 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2724} 2725