syscall.c revision 20eca8a1c5913043fcf4a67ff6cdc6293985831f
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/param.h> 36 37/* for struct iovec */ 38#include <sys/uio.h> 39 40#include "regs.h" 41#include "ptrace.h" 42 43#if defined(SPARC64) 44# undef PTRACE_GETREGS 45# define PTRACE_GETREGS PTRACE_GETREGS64 46# undef PTRACE_SETREGS 47# define PTRACE_SETREGS PTRACE_SETREGS64 48#endif 49 50#if defined SPARC64 51# include <asm/psrcompat.h> 52#elif defined SPARC 53# include <asm/psr.h> 54#endif 55 56#ifndef NT_PRSTATUS 57# define NT_PRSTATUS 1 58#endif 59 60#ifndef NSIG 61# warning: NSIG is not defined, using 32 62# define NSIG 32 63#endif 64 65#include "syscall.h" 66 67/* Define these shorthand notations to simplify the syscallent files. */ 68#define TD TRACE_DESC 69#define TF TRACE_FILE 70#define TI TRACE_IPC 71#define TN TRACE_NETWORK 72#define TP TRACE_PROCESS 73#define TS TRACE_SIGNAL 74#define TM TRACE_MEMORY 75#define NF SYSCALL_NEVER_FAILS 76#define MA MAX_ARGS 77#define SI STACKTRACE_INVALIDATE_CACHE 78#define SE STACKTRACE_CAPTURE_ON_ENTER 79 80const struct_sysent sysent0[] = { 81#include "syscallent.h" 82}; 83 84#if SUPPORTED_PERSONALITIES > 1 85static const struct_sysent sysent1[] = { 86# include "syscallent1.h" 87}; 88#endif 89 90#if SUPPORTED_PERSONALITIES > 2 91static const struct_sysent sysent2[] = { 92# include "syscallent2.h" 93}; 94#endif 95 96/* Now undef them since short defines cause wicked namespace pollution. */ 97#undef TD 98#undef TF 99#undef TI 100#undef TN 101#undef TP 102#undef TS 103#undef TM 104#undef NF 105#undef MA 106#undef SI 107#undef SE 108 109/* 110 * `ioctlent[012].h' files are automatically generated by the auxiliary 111 * program `ioctlsort', such that the list is sorted by the `code' field. 112 * This has the side-effect of resolving the _IO.. macros into 113 * plain integers, eliminating the need to include here everything 114 * in "/usr/include". 115 */ 116 117const char *const errnoent0[] = { 118#include "errnoent.h" 119}; 120const char *const signalent0[] = { 121#include "signalent.h" 122}; 123const struct_ioctlent ioctlent0[] = { 124#include "ioctlent0.h" 125}; 126 127#if SUPPORTED_PERSONALITIES > 1 128static const char *const errnoent1[] = { 129# include "errnoent1.h" 130}; 131static const char *const signalent1[] = { 132# include "signalent1.h" 133}; 134static const struct_ioctlent ioctlent1[] = { 135# include "ioctlent1.h" 136}; 137#endif 138 139#if SUPPORTED_PERSONALITIES > 2 140static const char *const errnoent2[] = { 141# include "errnoent2.h" 142}; 143static const char *const signalent2[] = { 144# include "signalent2.h" 145}; 146static const struct_ioctlent ioctlent2[] = { 147# include "ioctlent2.h" 148}; 149#endif 150 151enum { 152 nsyscalls0 = ARRAY_SIZE(sysent0) 153#if SUPPORTED_PERSONALITIES > 1 154 , nsyscalls1 = ARRAY_SIZE(sysent1) 155# if SUPPORTED_PERSONALITIES > 2 156 , nsyscalls2 = ARRAY_SIZE(sysent2) 157# endif 158#endif 159}; 160 161enum { 162 nerrnos0 = ARRAY_SIZE(errnoent0) 163#if SUPPORTED_PERSONALITIES > 1 164 , nerrnos1 = ARRAY_SIZE(errnoent1) 165# if SUPPORTED_PERSONALITIES > 2 166 , nerrnos2 = ARRAY_SIZE(errnoent2) 167# endif 168#endif 169}; 170 171enum { 172 nsignals0 = ARRAY_SIZE(signalent0) 173#if SUPPORTED_PERSONALITIES > 1 174 , nsignals1 = ARRAY_SIZE(signalent1) 175# if SUPPORTED_PERSONALITIES > 2 176 , nsignals2 = ARRAY_SIZE(signalent2) 177# endif 178#endif 179}; 180 181enum { 182 nioctlents0 = ARRAY_SIZE(ioctlent0) 183#if SUPPORTED_PERSONALITIES > 1 184 , nioctlents1 = ARRAY_SIZE(ioctlent1) 185# if SUPPORTED_PERSONALITIES > 2 186 , nioctlents2 = ARRAY_SIZE(ioctlent2) 187# endif 188#endif 189}; 190 191#if SUPPORTED_PERSONALITIES > 1 192const struct_sysent *sysent = sysent0; 193const char *const *errnoent = errnoent0; 194const char *const *signalent = signalent0; 195const struct_ioctlent *ioctlent = ioctlent0; 196#endif 197unsigned nsyscalls = nsyscalls0; 198unsigned nerrnos = nerrnos0; 199unsigned nsignals = nsignals0; 200unsigned nioctlents = nioctlents0; 201 202unsigned num_quals; 203qualbits_t *qual_vec[SUPPORTED_PERSONALITIES]; 204 205static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = { 206 nsyscalls0, 207#if SUPPORTED_PERSONALITIES > 1 208 nsyscalls1, 209#endif 210#if SUPPORTED_PERSONALITIES > 2 211 nsyscalls2, 212#endif 213}; 214static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = { 215 sysent0, 216#if SUPPORTED_PERSONALITIES > 1 217 sysent1, 218#endif 219#if SUPPORTED_PERSONALITIES > 2 220 sysent2, 221#endif 222}; 223 224enum { 225 MAX_NSYSCALLS1 = (nsyscalls0 226#if SUPPORTED_PERSONALITIES > 1 227 > nsyscalls1 ? nsyscalls0 : nsyscalls1 228#endif 229 ), 230 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1 231#if SUPPORTED_PERSONALITIES > 2 232 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2 233#endif 234 ), 235 MAX_NSYSCALLS = MAX_NSYSCALLS2, 236 /* We are ready for arches with up to 255 signals, 237 * even though the largest known signo is on MIPS and it is 128. 238 * The number of existing syscalls on all arches is 239 * larger that 255 anyway, so it is just a pedantic matter. 240 */ 241 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255 242}; 243 244#if SUPPORTED_PERSONALITIES > 1 245unsigned current_personality; 246 247# ifndef current_wordsize 248unsigned current_wordsize; 249static const int personality_wordsize[SUPPORTED_PERSONALITIES] = { 250 PERSONALITY0_WORDSIZE, 251 PERSONALITY1_WORDSIZE, 252# if SUPPORTED_PERSONALITIES > 2 253 PERSONALITY2_WORDSIZE, 254# endif 255}; 256# endif 257 258void 259set_personality(int personality) 260{ 261 nsyscalls = nsyscall_vec[personality]; 262 sysent = sysent_vec[personality]; 263 264 switch (personality) { 265 case 0: 266 errnoent = errnoent0; 267 nerrnos = nerrnos0; 268 ioctlent = ioctlent0; 269 nioctlents = nioctlents0; 270 signalent = signalent0; 271 nsignals = nsignals0; 272 break; 273 274 case 1: 275 errnoent = errnoent1; 276 nerrnos = nerrnos1; 277 ioctlent = ioctlent1; 278 nioctlents = nioctlents1; 279 signalent = signalent1; 280 nsignals = nsignals1; 281 break; 282 283# if SUPPORTED_PERSONALITIES > 2 284 case 2: 285 errnoent = errnoent2; 286 nerrnos = nerrnos2; 287 ioctlent = ioctlent2; 288 nioctlents = nioctlents2; 289 signalent = signalent2; 290 nsignals = nsignals2; 291 break; 292# endif 293 } 294 295 current_personality = personality; 296# ifndef current_wordsize 297 current_wordsize = personality_wordsize[personality]; 298# endif 299} 300 301static void 302update_personality(struct tcb *tcp, unsigned int personality) 303{ 304 if (personality == current_personality) 305 return; 306 set_personality(personality); 307 308 if (personality == tcp->currpers) 309 return; 310 tcp->currpers = personality; 311 312# if defined(POWERPC64) 313 if (!qflag) { 314 static const char *const names[] = {"64 bit", "32 bit"}; 315 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 316 tcp->pid, names[personality]); 317 } 318# elif defined(X86_64) 319 if (!qflag) { 320 static const char *const names[] = {"64 bit", "32 bit", "x32"}; 321 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 322 tcp->pid, names[personality]); 323 } 324# elif defined(X32) 325 if (!qflag) { 326 static const char *const names[] = {"x32", "32 bit"}; 327 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 328 tcp->pid, names[personality]); 329 } 330# elif defined(AARCH64) 331 if (!qflag) { 332 static const char *const names[] = {"32-bit", "AArch64"}; 333 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 334 tcp->pid, names[personality]); 335 } 336# elif defined(TILE) 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# endif 343} 344#endif 345 346static int qual_syscall(), qual_signal(), qual_desc(); 347 348static const struct qual_options { 349 unsigned int bitflag; 350 const char *option_name; 351 int (*qualify)(const char *, int, int); 352 const char *argument_name; 353} qual_options[] = { 354 { QUAL_TRACE, "trace", qual_syscall, "system call" }, 355 { QUAL_TRACE, "t", qual_syscall, "system call" }, 356 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" }, 357 { QUAL_ABBREV, "a", qual_syscall, "system call" }, 358 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" }, 359 { QUAL_VERBOSE, "v", qual_syscall, "system call" }, 360 { QUAL_RAW, "raw", qual_syscall, "system call" }, 361 { QUAL_RAW, "x", qual_syscall, "system call" }, 362 { QUAL_SIGNAL, "signal", qual_signal, "signal" }, 363 { QUAL_SIGNAL, "signals", qual_signal, "signal" }, 364 { QUAL_SIGNAL, "s", qual_signal, "signal" }, 365 { QUAL_READ, "read", qual_desc, "descriptor" }, 366 { QUAL_READ, "reads", qual_desc, "descriptor" }, 367 { QUAL_READ, "r", qual_desc, "descriptor" }, 368 { QUAL_WRITE, "write", qual_desc, "descriptor" }, 369 { QUAL_WRITE, "writes", qual_desc, "descriptor" }, 370 { QUAL_WRITE, "w", qual_desc, "descriptor" }, 371 { 0, NULL, NULL, NULL }, 372}; 373 374static void 375reallocate_qual(const unsigned int n) 376{ 377 unsigned p; 378 qualbits_t *qp; 379 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 380 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t)); 381 if (!qp) 382 die_out_of_memory(); 383 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t)); 384 } 385 num_quals = n; 386} 387 388static void 389qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers) 390{ 391 int p; 392 393 if (num_quals <= n) 394 reallocate_qual(n + 1); 395 396 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 397 if (pers == p || pers < 0) { 398 if (not) 399 qual_vec[p][n] &= ~bitflag; 400 else 401 qual_vec[p][n] |= bitflag; 402 } 403 } 404} 405 406static int 407qual_syscall(const char *s, const unsigned int bitflag, const int not) 408{ 409 int p; 410 unsigned int i; 411 int rc = -1; 412 413 if (*s >= '0' && *s <= '9') { 414 i = string_to_uint(s); 415 if (i >= MAX_NSYSCALLS) 416 return -1; 417 qualify_one(i, bitflag, not, -1); 418 return 0; 419 } 420 421 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 422 for (i = 0; i < nsyscall_vec[p]; i++) { 423 if (sysent_vec[p][i].sys_name 424 && strcmp(s, sysent_vec[p][i].sys_name) == 0 425 ) { 426 qualify_one(i, bitflag, not, p); 427 rc = 0; 428 } 429 } 430 } 431 432 return rc; 433} 434 435static int 436qual_signal(const char *s, const unsigned int bitflag, const int not) 437{ 438 unsigned int i; 439 440 if (*s >= '0' && *s <= '9') { 441 int signo = string_to_uint(s); 442 if (signo < 0 || signo > 255) 443 return -1; 444 qualify_one(signo, bitflag, not, -1); 445 return 0; 446 } 447 if (strncasecmp(s, "SIG", 3) == 0) 448 s += 3; 449 for (i = 0; i <= NSIG; i++) { 450 if (strcasecmp(s, signame(i) + 3) == 0) { 451 qualify_one(i, bitflag, not, -1); 452 return 0; 453 } 454 } 455 return -1; 456} 457 458static int 459qual_desc(const char *s, const unsigned int bitflag, const int not) 460{ 461 if (*s >= '0' && *s <= '9') { 462 int desc = string_to_uint(s); 463 if (desc < 0 || desc > 0x7fff) /* paranoia */ 464 return -1; 465 qualify_one(desc, bitflag, not, -1); 466 return 0; 467 } 468 return -1; 469} 470 471static int 472lookup_class(const char *s) 473{ 474 if (strcmp(s, "file") == 0) 475 return TRACE_FILE; 476 if (strcmp(s, "ipc") == 0) 477 return TRACE_IPC; 478 if (strcmp(s, "network") == 0) 479 return TRACE_NETWORK; 480 if (strcmp(s, "process") == 0) 481 return TRACE_PROCESS; 482 if (strcmp(s, "signal") == 0) 483 return TRACE_SIGNAL; 484 if (strcmp(s, "desc") == 0) 485 return TRACE_DESC; 486 if (strcmp(s, "memory") == 0) 487 return TRACE_MEMORY; 488 return -1; 489} 490 491void 492qualify(const char *s) 493{ 494 const struct qual_options *opt; 495 char *copy; 496 const char *p; 497 int not; 498 unsigned int i; 499 500 if (num_quals == 0) 501 reallocate_qual(MIN_QUALS); 502 503 opt = &qual_options[0]; 504 for (i = 0; (p = qual_options[i].option_name); i++) { 505 unsigned int len = strlen(p); 506 if (strncmp(s, p, len) == 0 && s[len] == '=') { 507 opt = &qual_options[i]; 508 s += len + 1; 509 break; 510 } 511 } 512 not = 0; 513 if (*s == '!') { 514 not = 1; 515 s++; 516 } 517 if (strcmp(s, "none") == 0) { 518 not = 1 - not; 519 s = "all"; 520 } 521 if (strcmp(s, "all") == 0) { 522 for (i = 0; i < num_quals; i++) { 523 qualify_one(i, opt->bitflag, not, -1); 524 } 525 return; 526 } 527 for (i = 0; i < num_quals; i++) { 528 qualify_one(i, opt->bitflag, !not, -1); 529 } 530 copy = strdup(s); 531 if (!copy) 532 die_out_of_memory(); 533 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) { 534 int n; 535 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) { 536 unsigned pers; 537 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) { 538 for (i = 0; i < nsyscall_vec[pers]; i++) 539 if (sysent_vec[pers][i].sys_flags & n) 540 qualify_one(i, opt->bitflag, not, pers); 541 } 542 continue; 543 } 544 if (opt->qualify(p, opt->bitflag, not)) { 545 error_msg_and_die("invalid %s '%s'", 546 opt->argument_name, p); 547 } 548 } 549 free(copy); 550 return; 551} 552 553#ifdef SYS_socket_subcall 554static void 555decode_socket_subcall(struct tcb *tcp) 556{ 557 unsigned long addr; 558 unsigned int i, n, size; 559 560 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls) 561 return; 562 563 tcp->scno = SYS_socket_subcall + tcp->u_arg[0]; 564 tcp->qual_flg = qual_flags[tcp->scno]; 565 tcp->s_ent = &sysent[tcp->scno]; 566 addr = tcp->u_arg[1]; 567 size = current_wordsize; 568 n = tcp->s_ent->nargs; 569 for (i = 0; i < n; ++i) { 570 if (size == sizeof(int)) { 571 unsigned int arg; 572 if (umove(tcp, addr, &arg) < 0) 573 arg = 0; 574 tcp->u_arg[i] = arg; 575 } 576 else { 577 unsigned long arg; 578 if (umove(tcp, addr, &arg) < 0) 579 arg = 0; 580 tcp->u_arg[i] = arg; 581 } 582 addr += size; 583 } 584} 585#endif 586 587#ifdef SYS_ipc_subcall 588static void 589decode_ipc_subcall(struct tcb *tcp) 590{ 591 unsigned int i, n; 592 593 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls) 594 return; 595 596 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0]; 597 tcp->qual_flg = qual_flags[tcp->scno]; 598 tcp->s_ent = &sysent[tcp->scno]; 599 n = tcp->s_ent->nargs; 600 for (i = 0; i < n; i++) 601 tcp->u_arg[i] = tcp->u_arg[i + 1]; 602} 603#endif 604 605int 606printargs(struct tcb *tcp) 607{ 608 if (entering(tcp)) { 609 int i; 610 int n = tcp->s_ent->nargs; 611 for (i = 0; i < n; i++) 612 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]); 613 } 614 return 0; 615} 616 617int 618printargs_lu(struct tcb *tcp) 619{ 620 if (entering(tcp)) { 621 int i; 622 int n = tcp->s_ent->nargs; 623 for (i = 0; i < n; i++) 624 tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]); 625 } 626 return 0; 627} 628 629int 630printargs_ld(struct tcb *tcp) 631{ 632 if (entering(tcp)) { 633 int i; 634 int n = tcp->s_ent->nargs; 635 for (i = 0; i < n; i++) 636 tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]); 637 } 638 return 0; 639} 640 641#if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH) 642long 643getrval2(struct tcb *tcp) 644{ 645 long val; 646 647# if defined(SPARC) || defined(SPARC64) 648 val = sparc_regs.u_regs[U_REG_O1]; 649# elif defined(SH) 650 if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0) 651 return -1; 652# elif defined(IA64) 653 if (upeek(tcp->pid, PT_R9, &val) < 0) 654 return -1; 655# endif 656 657 return val; 658} 659#endif 660 661#if defined(I386) 662static struct user_regs_struct i386_regs; 663long *const i386_esp_ptr = &i386_regs.esp; 664# define ARCH_REGS_FOR_GETREGS i386_regs 665#elif defined(X86_64) || defined(X32) 666/* 667 * On i386, pt_regs and user_regs_struct are the same, 668 * but on 64 bit x86, user_regs_struct has six more fields: 669 * fs_base, gs_base, ds, es, fs, gs. 670 * PTRACE_GETREGS fills them too, so struct pt_regs would overflow. 671 */ 672struct i386_user_regs_struct { 673 uint32_t ebx; 674 uint32_t ecx; 675 uint32_t edx; 676 uint32_t esi; 677 uint32_t edi; 678 uint32_t ebp; 679 uint32_t eax; 680 uint32_t xds; 681 uint32_t xes; 682 uint32_t xfs; 683 uint32_t xgs; 684 uint32_t orig_eax; 685 uint32_t eip; 686 uint32_t xcs; 687 uint32_t eflags; 688 uint32_t esp; 689 uint32_t xss; 690}; 691static union { 692 struct user_regs_struct x86_64_r; 693 struct i386_user_regs_struct i386_r; 694} x86_regs_union; 695# define x86_64_regs x86_regs_union.x86_64_r 696# define i386_regs x86_regs_union.i386_r 697uint32_t *const i386_esp_ptr = &i386_regs.esp; 698uint64_t *const x86_64_rsp_ptr = (uint64_t *) &x86_64_regs.rsp; 699static struct iovec x86_io = { 700 .iov_base = &x86_regs_union 701}; 702# define ARCH_REGS_FOR_GETREGSET x86_regs_union 703# define ARCH_IOVEC_FOR_GETREGSET x86_io 704#elif defined(IA64) 705static bool ia64_ia32mode; 706static long ia64_r8, ia64_r10; 707#elif defined(POWERPC) 708struct pt_regs ppc_regs; /* not static */ 709# define ARCH_REGS_FOR_GETREGS ppc_regs 710#elif defined(M68K) 711static long m68k_d0; 712#elif defined(BFIN) 713static long bfin_r0; 714#elif defined(ARM) 715static struct pt_regs arm_regs; 716long *const arm_sp_ptr = &arm_regs.ARM_sp; 717# define ARCH_REGS_FOR_GETREGS arm_regs 718#elif defined(AARCH64) 719struct arm_pt_regs { 720 int uregs[18]; 721}; 722# define ARM_cpsr uregs[16] 723# define ARM_pc uregs[15] 724# define ARM_lr uregs[14] 725# define ARM_sp uregs[13] 726# define ARM_ip uregs[12] 727# define ARM_fp uregs[11] 728# define ARM_r10 uregs[10] 729# define ARM_r9 uregs[9] 730# define ARM_r8 uregs[8] 731# define ARM_r7 uregs[7] 732# define ARM_r6 uregs[6] 733# define ARM_r5 uregs[5] 734# define ARM_r4 uregs[4] 735# define ARM_r3 uregs[3] 736# define ARM_r2 uregs[2] 737# define ARM_r1 uregs[1] 738# define ARM_r0 uregs[0] 739# define ARM_ORIG_r0 uregs[17] 740static union { 741 struct user_pt_regs aarch64_r; 742 struct arm_pt_regs arm_r; 743} arm_regs_union; 744# define aarch64_regs arm_regs_union.aarch64_r 745# define arm_regs arm_regs_union.arm_r 746uint64_t *const aarch64_sp_ptr = (uint64_t *) &aarch64_regs.sp; 747uint32_t *const arm_sp_ptr = (uint32_t *) &arm_regs.ARM_sp; 748static struct iovec aarch64_io = { 749 .iov_base = &arm_regs_union 750}; 751# define ARCH_REGS_FOR_GETREGSET arm_regs_union 752# define ARCH_IOVEC_FOR_GETREGSET aarch64_io 753#elif defined(ALPHA) 754static long alpha_r0; 755static long alpha_a3; 756#elif defined(AVR32) 757static struct pt_regs avr32_regs; 758# define ARCH_REGS_FOR_GETREGS avr32_regs 759#elif defined(SPARC) || defined(SPARC64) 760struct pt_regs sparc_regs; /* not static */ 761# define ARCH_REGS_FOR_GETREGS sparc_regs 762#elif defined(MIPS) 763struct mips_regs mips_regs; /* not static */ 764/* PTRACE_GETREGS on MIPS is available since linux v2.6.15. */ 765# define ARCH_REGS_FOR_GETREGS mips_regs 766#elif defined(S390) || defined(S390X) 767/* PTRACE_GETREGSET on S390 is available since linux v2.6.27. */ 768static struct user_regs_struct s390_regset; 769unsigned long *const s390_frame_ptr = &s390_regset.gprs[15]; 770# define ARCH_REGS_FOR_GETREGSET s390_regset 771#elif defined(HPPA) 772static long hppa_r28; 773#elif defined(SH) 774static long sh_r0; 775#elif defined(SH64) 776static long sh64_r9; 777#elif defined(CRISV10) || defined(CRISV32) 778static long cris_r10; 779#elif defined(TILE) 780struct pt_regs tile_regs; /* not static */ 781# define ARCH_REGS_FOR_GETREGS tile_regs 782#elif defined(MICROBLAZE) 783static long microblaze_r3; 784#elif defined(OR1K) 785static struct user_regs_struct or1k_regs; 786# define ARCH_REGS_FOR_GETREGSET or1k_regs 787#elif defined(METAG) 788static struct user_gp_regs metag_regs; 789# define ARCH_REGS_FOR_GETREGSET metag_regs 790#elif defined(XTENSA) 791static long xtensa_a2; 792# elif defined(ARC) 793static struct user_regs_struct arc_regs; 794# define ARCH_REGS_FOR_GETREGSET arc_regs 795#endif 796 797static long get_regs_error; 798 799void 800print_pc(struct tcb *tcp) 801{ 802 const char *fmt; 803 const char *bad; 804 805#ifdef current_wordsize 806# define pc_wordsize current_wordsize 807#else 808# define pc_wordsize personality_wordsize[tcp->currpers] 809#endif 810 811 if (pc_wordsize == 4) { 812 fmt = "[%08lx] "; 813 bad = "[????????] "; 814 } else { 815 fmt = "[%016lx] "; 816 bad = "[????????????????] "; 817 } 818 819#undef pc_wordsize 820#define PRINTBADPC tprints(bad) 821 822 if (get_regs_error) { 823 PRINTBADPC; 824 return; 825 } 826 827#if defined(I386) 828 tprintf(fmt, i386_regs.eip); 829#elif defined(X86_64) || defined(X32) 830 if (x86_io.iov_len == sizeof(i386_regs)) 831 tprintf(fmt, (unsigned long) i386_regs.eip); 832 else 833 tprintf(fmt, (unsigned long) x86_64_regs.rip); 834#elif defined(S390) || defined(S390X) 835 tprintf(fmt, s390_regset.psw.addr); 836#elif defined(IA64) 837 long ip; 838 if (upeek(tcp->pid, PT_B0, &ip) < 0) { 839 PRINTBADPC; 840 return; 841 } 842 tprintf(fmt, ip); 843#elif defined(POWERPC) 844 tprintf(fmt, ppc_regs.nip); 845#elif defined(M68K) 846 long pc; 847 if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) { 848 PRINTBADPC; 849 return; 850 } 851 tprintf(fmt, pc); 852#elif defined(ALPHA) 853 long pc; 854 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 855 PRINTBADPC; 856 return; 857 } 858 tprintf(fmt, pc); 859#elif defined(SPARC) 860 tprintf(fmt, sparc_regs.pc); 861#elif defined(SPARC64) 862 tprintf(fmt, sparc_regs.tpc); 863#elif defined(HPPA) 864 long pc; 865 if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) { 866 PRINTBADPC; 867 return; 868 } 869 tprintf(fmt, pc); 870#elif defined MIPS 871 tprintf(fmt, (unsigned long) mips_REG_EPC); 872#elif defined(SH) 873 long pc; 874 if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) { 875 PRINTBADPC; 876 return; 877 } 878 tprintf(fmt, pc); 879#elif defined(SH64) 880 long pc; 881 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 882 PRINTBADPC; 883 return; 884 } 885 tprintf(fmt, pc); 886#elif defined(AARCH64) 887 if (aarch64_io.iov_len == sizeof(arm_regs)) 888 tprintf(fmt, (unsigned long) arm_regs.ARM_pc); 889 else 890 tprintf(fmt, (unsigned long) aarch64_regs.pc); 891#elif defined(ARM) 892 tprintf(fmt, arm_regs.ARM_pc); 893#elif defined(AVR32) 894 tprintf(fmt, avr32_regs.pc); 895#elif defined(BFIN) 896 long pc; 897 if (upeek(tcp->pid, PT_PC, &pc) < 0) { 898 PRINTBADPC; 899 return; 900 } 901 tprintf(fmt, pc); 902#elif defined(CRISV10) 903 long pc; 904 if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) { 905 PRINTBADPC; 906 return; 907 } 908 tprintf(fmt, pc); 909#elif defined(CRISV32) 910 long pc; 911 if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) { 912 PRINTBADPC; 913 return; 914 } 915 tprintf(fmt, pc); 916#elif defined(TILE) 917 tprintf(fmt, (unsigned long) tile_regs.pc); 918#elif defined(OR1K) 919 tprintf(fmt, or1k_regs.pc); 920#elif defined(METAG) 921 tprintf(fmt, metag_regs.pc); 922#elif defined(XTENSA) 923 long pc; 924 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 925 PRINTBADPC; 926 return; 927 } 928 tprintf(fmt, pc); 929#elif defined(ARC) 930 tprintf(fmt, arc_regs.efa); 931#else 932# warning print_pc is not implemented for this architecture 933 PRINTBADPC; 934#endif /* architecture */ 935} 936 937/* 938 * Shuffle syscall numbers so that we don't have huge gaps in syscall table. 939 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n. 940 */ 941#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */ 942static long 943shuffle_scno(unsigned long scno) 944{ 945 if (scno < ARM_FIRST_SHUFFLED_SYSCALL) 946 return scno; 947 948 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */ 949 if (scno == ARM_FIRST_SHUFFLED_SYSCALL) 950 return 0x000ffff0; 951 if (scno == 0x000ffff0) 952 return ARM_FIRST_SHUFFLED_SYSCALL; 953 954#define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1) 955 /* 956 * Is it ARM specific syscall? 957 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range 958 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range. 959 */ 960 if (scno >= 0x000f0000 && 961 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) { 962 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL; 963 } 964 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) { 965 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL; 966 } 967 968 return scno; 969} 970#else 971# define shuffle_scno(scno) ((long)(scno)) 972#endif 973 974static char* 975undefined_scno_name(struct tcb *tcp) 976{ 977 static char buf[sizeof("syscall_%lu") + sizeof(long)*3]; 978 979 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno)); 980 return buf; 981} 982 983#ifdef POWERPC 984/* 985 * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23, 986 * we provide a slow fallback for old kernels. 987 */ 988static int powerpc_getregs_old(pid_t pid) 989{ 990 int i; 991 long r; 992 993 if (iflag) { 994 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip); 995 if (r) 996 goto out; 997 } 998#ifdef POWERPC64 /* else we never use it */ 999 r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr); 1000 if (r) 1001 goto out; 1002#endif 1003 r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr); 1004 if (r) 1005 goto out; 1006 r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3); 1007 if (r) 1008 goto out; 1009 for (i = 0; i <= 8; i++) { 1010 r = upeek(pid, sizeof(long) * (PT_R0 + i), 1011 (long *)&ppc_regs.gpr[i]); 1012 if (r) 1013 goto out; 1014 } 1015 out: 1016 return r; 1017} 1018#endif 1019 1020void 1021clear_regs(void) 1022{ 1023 get_regs_error = -1; 1024} 1025 1026#if defined ARCH_REGS_FOR_GETREGSET 1027static long 1028get_regset(pid_t pid) 1029{ 1030# ifdef ARCH_IOVEC_FOR_GETREGSET 1031 /* variable iovec */ 1032 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET); 1033 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, 1034 &ARCH_IOVEC_FOR_GETREGSET); 1035# else 1036 /* constant iovec */ 1037 static struct iovec io = { 1038 .iov_base = &ARCH_REGS_FOR_GETREGSET, 1039 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET) 1040 }; 1041 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io); 1042 1043# endif 1044} 1045#endif /* ARCH_REGS_FOR_GETREGSET */ 1046 1047void 1048get_regs(pid_t pid) 1049{ 1050#ifdef ARCH_REGS_FOR_GETREGSET 1051# ifdef X86_64 1052 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */ 1053 static int getregset_support; 1054 1055 if (getregset_support >= 0) { 1056 get_regs_error = get_regset(pid); 1057 if (getregset_support > 0) 1058 return; 1059 if (get_regs_error >= 0) { 1060 getregset_support = 1; 1061 return; 1062 } 1063 if (errno == EPERM || errno == ESRCH) 1064 return; 1065 getregset_support = -1; 1066 } 1067 /* Use old method, with unreliable heuristical detection of 32-bitness. */ 1068 x86_io.iov_len = sizeof(x86_64_regs); 1069 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs); 1070 if (!get_regs_error && x86_64_regs.cs == 0x23) { 1071 x86_io.iov_len = sizeof(i386_regs); 1072 /* 1073 * The order is important: i386_regs and x86_64_regs 1074 * are overlaid in memory! 1075 */ 1076 i386_regs.ebx = x86_64_regs.rbx; 1077 i386_regs.ecx = x86_64_regs.rcx; 1078 i386_regs.edx = x86_64_regs.rdx; 1079 i386_regs.esi = x86_64_regs.rsi; 1080 i386_regs.edi = x86_64_regs.rdi; 1081 i386_regs.ebp = x86_64_regs.rbp; 1082 i386_regs.eax = x86_64_regs.rax; 1083 /* i386_regs.xds = x86_64_regs.ds; unused by strace */ 1084 /* i386_regs.xes = x86_64_regs.es; ditto... */ 1085 /* i386_regs.xfs = x86_64_regs.fs; */ 1086 /* i386_regs.xgs = x86_64_regs.gs; */ 1087 i386_regs.orig_eax = x86_64_regs.orig_rax; 1088 i386_regs.eip = x86_64_regs.rip; 1089 /* i386_regs.xcs = x86_64_regs.cs; */ 1090 /* i386_regs.eflags = x86_64_regs.eflags; */ 1091 i386_regs.esp = x86_64_regs.rsp; 1092 /* i386_regs.xss = x86_64_regs.ss; */ 1093 } 1094# else /* !X86_64 */ 1095 /* Assume that PTRACE_GETREGSET works. */ 1096 get_regs_error = get_regset(pid); 1097# endif 1098#elif defined ARCH_REGS_FOR_GETREGS 1099# if defined SPARC || defined SPARC64 1100 /* SPARC systems have the meaning of data and addr reversed */ 1101 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0); 1102# elif defined POWERPC 1103 static bool old_kernel = 0; 1104 if (old_kernel) 1105 goto old; 1106 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1107 if (get_regs_error && errno == EIO) { 1108 old_kernel = 1; 1109 old: 1110 get_regs_error = powerpc_getregs_old(pid); 1111 } 1112# else 1113 /* Assume that PTRACE_GETREGS works. */ 1114 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1115# endif 1116 1117#else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */ 1118# warning get_regs is not implemented for this architecture yet 1119 get_regs_error = 0; 1120#endif 1121} 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 scno = s390_regset.gprs[2]; 1136#elif defined(POWERPC) 1137 scno = ppc_regs.gpr[0]; 1138# ifdef POWERPC64 1139 unsigned int currpers; 1140 1141 /* 1142 * Check for 64/32 bit mode. 1143 * Embedded implementations covered by Book E extension of PPC use 1144 * bit 0 (CM) of 32-bit Machine state register (MSR). 1145 * Other implementations use bit 0 (SF) of 64-bit MSR. 1146 */ 1147 currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1; 1148 update_personality(tcp, currpers); 1149# endif 1150#elif defined(AVR32) 1151 scno = avr32_regs.r8; 1152#elif defined(BFIN) 1153 if (upeek(tcp->pid, PT_ORIG_P0, &scno)) 1154 return -1; 1155#elif defined(I386) 1156 scno = i386_regs.orig_eax; 1157#elif defined(X86_64) || defined(X32) 1158# ifndef __X32_SYSCALL_BIT 1159# define __X32_SYSCALL_BIT 0x40000000 1160# endif 1161 unsigned int currpers; 1162# if 1 1163 /* GETREGSET of NT_PRSTATUS tells us regset size, 1164 * which unambiguously detects i386. 1165 * 1166 * Linux kernel distinguishes x86-64 and x32 processes 1167 * solely by looking at __X32_SYSCALL_BIT: 1168 * arch/x86/include/asm/compat.h::is_x32_task(): 1169 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 1170 * return true; 1171 */ 1172 if (x86_io.iov_len == sizeof(i386_regs)) { 1173 scno = i386_regs.orig_eax; 1174 currpers = 1; 1175 } else { 1176 scno = x86_64_regs.orig_rax; 1177 currpers = 0; 1178 if (scno & __X32_SYSCALL_BIT) { 1179 /* 1180 * Syscall number -1 requires special treatment: 1181 * it might be a side effect of SECCOMP_RET_ERRNO 1182 * filtering that sets orig_rax to -1 1183 * in some versions of linux kernel. 1184 * If that is the case, then 1185 * __X32_SYSCALL_BIT logic does not apply. 1186 */ 1187 if ((long long) x86_64_regs.orig_rax != -1) { 1188 scno -= __X32_SYSCALL_BIT; 1189 currpers = 2; 1190 } else { 1191# ifdef X32 1192 currpers = 2; 1193# endif 1194 } 1195 } 1196 } 1197# elif 0 1198 /* cs = 0x33 for long mode (native 64 bit and x32) 1199 * cs = 0x23 for compatibility mode (32 bit) 1200 * ds = 0x2b for x32 mode (x86-64 in 32 bit) 1201 */ 1202 scno = x86_64_regs.orig_rax; 1203 switch (x86_64_regs.cs) { 1204 case 0x23: currpers = 1; break; 1205 case 0x33: 1206 if (x86_64_regs.ds == 0x2b) { 1207 currpers = 2; 1208 scno &= ~__X32_SYSCALL_BIT; 1209 } else 1210 currpers = 0; 1211 break; 1212 default: 1213 fprintf(stderr, "Unknown value CS=0x%08X while " 1214 "detecting personality of process " 1215 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid); 1216 currpers = current_personality; 1217 break; 1218 } 1219# elif 0 1220 /* This version analyzes the opcode of a syscall instruction. 1221 * (int 0x80 on i386 vs. syscall on x86-64) 1222 * It works, but is too complicated, and strictly speaking, unreliable. 1223 */ 1224 unsigned long call, rip = x86_64_regs.rip; 1225 /* sizeof(syscall) == sizeof(int 0x80) == 2 */ 1226 rip -= 2; 1227 errno = 0; 1228 call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0); 1229 if (errno) 1230 fprintf(stderr, "ptrace_peektext failed: %s\n", 1231 strerror(errno)); 1232 switch (call & 0xffff) { 1233 /* x86-64: syscall = 0x0f 0x05 */ 1234 case 0x050f: currpers = 0; break; 1235 /* i386: int 0x80 = 0xcd 0x80 */ 1236 case 0x80cd: currpers = 1; break; 1237 default: 1238 currpers = current_personality; 1239 fprintf(stderr, 1240 "Unknown syscall opcode (0x%04X) while " 1241 "detecting personality of process " 1242 "PID=%d\n", (int)call, tcp->pid); 1243 break; 1244 } 1245# endif 1246 1247# ifdef X32 1248 /* If we are built for a x32 system, then personality 0 is x32 1249 * (not x86_64), and stracing of x86_64 apps is not supported. 1250 * Stracing of i386 apps is still supported. 1251 */ 1252 if (currpers == 0) { 1253 fprintf(stderr, "syscall_%lu(...) in unsupported " 1254 "64-bit mode of process PID=%d\n", 1255 scno, tcp->pid); 1256 return 0; 1257 } 1258 currpers &= ~2; /* map 2,1 to 0,1 */ 1259# endif 1260 update_personality(tcp, currpers); 1261#elif defined(IA64) 1262# define IA64_PSR_IS ((long)1 << 34) 1263 long psr; 1264 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1265 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1266 if (ia64_ia32mode) { 1267 if (upeek(tcp->pid, PT_R1, &scno) < 0) 1268 return -1; 1269 } else { 1270 if (upeek(tcp->pid, PT_R15, &scno) < 0) 1271 return -1; 1272 } 1273#elif defined(AARCH64) 1274 switch (aarch64_io.iov_len) { 1275 case sizeof(aarch64_regs): 1276 /* We are in 64-bit mode */ 1277 scno = aarch64_regs.regs[8]; 1278 update_personality(tcp, 1); 1279 break; 1280 case sizeof(arm_regs): 1281 /* We are in 32-bit mode */ 1282 /* Note: we don't support OABI, unlike 32-bit ARM build */ 1283 scno = arm_regs.ARM_r7; 1284 scno = shuffle_scno(scno); 1285 update_personality(tcp, 0); 1286 break; 1287 } 1288#elif defined(ARM) 1289 if (arm_regs.ARM_ip != 0) { 1290 /* It is not a syscall entry */ 1291 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid); 1292 tcp->flags |= TCB_INSYSCALL; 1293 return 0; 1294 } 1295 /* Note: we support only 32-bit CPUs, not 26-bit */ 1296 1297# if !defined(__ARM_EABI__) || ENABLE_ARM_OABI 1298 if (arm_regs.ARM_cpsr & 0x20) 1299 /* Thumb mode */ 1300 goto scno_in_r7; 1301 /* ARM mode */ 1302 /* Check EABI/OABI by examining SVC insn's low 24 bits */ 1303 errno = 0; 1304 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); 1305 if (errno) 1306 return -1; 1307 /* EABI syscall convention? */ 1308 if ((unsigned long) scno != 0xef000000) { 1309 /* No, it's OABI */ 1310 if ((scno & 0x0ff00000) != 0x0f900000) { 1311 fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n", 1312 tcp->pid, scno); 1313 return -1; 1314 } 1315 /* Fixup the syscall number */ 1316 scno &= 0x000fffff; 1317 } else { 1318 scno_in_r7: 1319 scno = arm_regs.ARM_r7; 1320 } 1321# else /* __ARM_EABI__ || !ENABLE_ARM_OABI */ 1322 scno = arm_regs.ARM_r7; 1323# endif 1324 scno = shuffle_scno(scno); 1325#elif defined(M68K) 1326 if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0) 1327 return -1; 1328#elif defined(MIPS) 1329 scno = mips_REG_V0; 1330 1331 if (!SCNO_IN_RANGE(scno)) { 1332 if (mips_REG_A3 == 0 || mips_REG_A3 == (uint64_t) -1) { 1333 if (debug_flag) 1334 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1335 return 0; 1336 } 1337 } 1338#elif defined(ALPHA) 1339 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1340 return -1; 1341 if (upeek(tcp->pid, REG_R0, &scno) < 0) 1342 return -1; 1343 1344 /* 1345 * Do some sanity checks to figure out if it's 1346 * really a syscall entry 1347 */ 1348 if (!SCNO_IN_RANGE(scno)) { 1349 if (alpha_a3 == 0 || alpha_a3 == -1) { 1350 if (debug_flag) 1351 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno); 1352 return 0; 1353 } 1354 } 1355#elif defined(SPARC) || defined(SPARC64) 1356 /* Disassemble the syscall trap. */ 1357 /* Retrieve the syscall trap instruction. */ 1358 unsigned long trap; 1359 errno = 0; 1360# if defined(SPARC64) 1361 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0); 1362 trap >>= 32; 1363# else 1364 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0); 1365# endif 1366 if (errno) 1367 return -1; 1368 1369 /* Disassemble the trap to see what personality to use. */ 1370 switch (trap) { 1371 case 0x91d02010: 1372 /* Linux/SPARC syscall trap. */ 1373 update_personality(tcp, 0); 1374 break; 1375 case 0x91d0206d: 1376 /* Linux/SPARC64 syscall trap. */ 1377 update_personality(tcp, 2); 1378 break; 1379 case 0x91d02000: 1380 /* SunOS syscall trap. (pers 1) */ 1381 fprintf(stderr, "syscall: SunOS no support\n"); 1382 return -1; 1383 case 0x91d02008: 1384 /* Solaris 2.x syscall trap. (per 2) */ 1385 update_personality(tcp, 1); 1386 break; 1387 case 0x91d02009: 1388 /* NetBSD/FreeBSD syscall trap. */ 1389 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n"); 1390 return -1; 1391 case 0x91d02027: 1392 /* Solaris 2.x gettimeofday */ 1393 update_personality(tcp, 1); 1394 break; 1395 default: 1396# if defined(SPARC64) 1397 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc); 1398# else 1399 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc); 1400# endif 1401 return -1; 1402 } 1403 1404 /* Extract the system call number from the registers. */ 1405 if (trap == 0x91d02027) 1406 scno = 156; 1407 else 1408 scno = sparc_regs.u_regs[U_REG_G1]; 1409 if (scno == 0) { 1410 scno = sparc_regs.u_regs[U_REG_O0]; 1411 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0])); 1412 } 1413#elif defined(HPPA) 1414 if (upeek(tcp->pid, PT_GR20, &scno) < 0) 1415 return -1; 1416#elif defined(SH) 1417 /* 1418 * In the new syscall ABI, the system call number is in R3. 1419 */ 1420 if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0) 1421 return -1; 1422 1423 if (scno < 0) { 1424 /* Odd as it may seem, a glibc bug has been known to cause 1425 glibc to issue bogus negative syscall numbers. So for 1426 our purposes, make strace print what it *should* have been */ 1427 long correct_scno = (scno & 0xff); 1428 if (debug_flag) 1429 fprintf(stderr, 1430 "Detected glibc bug: bogus system call" 1431 " number = %ld, correcting to %ld\n", 1432 scno, 1433 correct_scno); 1434 scno = correct_scno; 1435 } 1436#elif defined(SH64) 1437 if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0) 1438 return -1; 1439 scno &= 0xFFFF; 1440#elif defined(CRISV10) || defined(CRISV32) 1441 if (upeek(tcp->pid, 4*PT_R9, &scno) < 0) 1442 return -1; 1443#elif defined(TILE) 1444 unsigned int currpers; 1445 scno = tile_regs.regs[10]; 1446# ifdef __tilepro__ 1447 currpers = 1; 1448# else 1449# ifndef PT_FLAGS_COMPAT 1450# define PT_FLAGS_COMPAT 0x10000 /* from Linux 3.8 on */ 1451# endif 1452 if (tile_regs.flags & PT_FLAGS_COMPAT) 1453 currpers = 1; 1454 else 1455 currpers = 0; 1456# endif 1457 update_personality(tcp, currpers); 1458#elif defined(MICROBLAZE) 1459 if (upeek(tcp->pid, 0, &scno) < 0) 1460 return -1; 1461#elif defined(OR1K) 1462 scno = or1k_regs.gpr[11]; 1463#elif defined(METAG) 1464 scno = metag_regs.dx[0][1]; /* syscall number in D1Re0 (D1.0) */ 1465#elif defined(XTENSA) 1466 if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0) 1467 return -1; 1468# elif defined(ARC) 1469 scno = arc_regs.scratch.r8; 1470#endif 1471 1472 tcp->scno = scno; 1473 if (SCNO_IS_VALID(tcp->scno)) { 1474 tcp->s_ent = &sysent[scno]; 1475 tcp->qual_flg = qual_flags[scno]; 1476 } else { 1477 static const struct_sysent unknown = { 1478 .nargs = MAX_ARGS, 1479 .sys_flags = 0, 1480 .sys_func = printargs, 1481 .sys_name = "unknown", /* not used */ 1482 }; 1483 tcp->s_ent = &unknown; 1484 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS; 1485 } 1486 return 1; 1487} 1488 1489/* 1490 * Cannot rely on __kernel_[u]long_t being defined, 1491 * it is quite a recent feature of <asm/posix_types.h>. 1492 */ 1493#ifdef __kernel_long_t 1494typedef __kernel_long_t kernel_long_t; 1495typedef __kernel_ulong_t kernel_ulong_t; 1496#else 1497# ifdef X32 1498typedef long long kernel_long_t; 1499typedef unsigned long long kernel_ulong_t; 1500# else 1501typedef long kernel_long_t; 1502typedef unsigned long kernel_ulong_t; 1503# endif 1504#endif 1505 1506/* 1507 * Check the syscall return value register value for whether it is 1508 * a negated errno code indicating an error, or a success return value. 1509 */ 1510static inline bool 1511is_negated_errno(kernel_ulong_t val) 1512{ 1513 /* Linux kernel defines MAX_ERRNO to 4095. */ 1514 kernel_ulong_t max = -(kernel_long_t) 4095; 1515 1516#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 1517 if (current_wordsize < sizeof(val)) { 1518 val = (uint32_t) val; 1519 max = (uint32_t) max; 1520 } 1521#elif defined X32 1522 /* 1523 * current_wordsize is 4 even in personality 0 (native X32) 1524 * but truncation _must not_ be done in it. 1525 * can't check current_wordsize here! 1526 */ 1527 if (current_personality != 0) { 1528 val = (uint32_t) val; 1529 max = (uint32_t) max; 1530 } 1531#endif 1532 1533 return val >= max; 1534} 1535 1536/* Return -1 on error or 1 on success (never 0!) */ 1537static int 1538get_syscall_args(struct tcb *tcp) 1539{ 1540 int i, nargs; 1541 1542 nargs = tcp->s_ent->nargs; 1543 1544#if defined(S390) || defined(S390X) 1545 (void)i; 1546 (void)nargs; 1547 tcp->u_arg[0] = s390_regset.orig_gpr2; 1548 tcp->u_arg[1] = s390_regset.gprs[3]; 1549 tcp->u_arg[2] = s390_regset.gprs[4]; 1550 tcp->u_arg[3] = s390_regset.gprs[5]; 1551 tcp->u_arg[4] = s390_regset.gprs[6]; 1552 tcp->u_arg[5] = s390_regset.gprs[7]; 1553#elif defined(ALPHA) 1554 for (i = 0; i < nargs; ++i) 1555 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1556 return -1; 1557#elif defined(IA64) 1558 if (!ia64_ia32mode) { 1559 unsigned long *out0, cfm, sof, sol; 1560 long rbs_end; 1561 /* be backwards compatible with kernel < 2.4.4... */ 1562# ifndef PT_RBS_END 1563# define PT_RBS_END PT_AR_BSP 1564# endif 1565 1566 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1567 return -1; 1568 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1569 return -1; 1570 1571 sof = (cfm >> 0) & 0x7f; 1572 sol = (cfm >> 7) & 0x7f; 1573 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1574 1575 for (i = 0; i < nargs; ++i) { 1576 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1577 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1578 return -1; 1579 } 1580 } else { 1581 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1582 PT_R9 /* ECX = out1 */, 1583 PT_R10 /* EDX = out2 */, 1584 PT_R14 /* ESI = out3 */, 1585 PT_R15 /* EDI = out4 */, 1586 PT_R13 /* EBP = out5 */}; 1587 1588 for (i = 0; i < nargs; ++i) { 1589 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1590 return -1; 1591 /* truncate away IVE sign-extension */ 1592 tcp->u_arg[i] &= 0xffffffff; 1593 } 1594 } 1595#elif defined LINUX_MIPSN64 1596 (void)i; 1597 (void)nargs; 1598 tcp->u_arg[0] = mips_REG_A0; 1599 tcp->u_arg[1] = mips_REG_A1; 1600 tcp->u_arg[2] = mips_REG_A2; 1601 tcp->u_arg[3] = mips_REG_A3; 1602 tcp->u_arg[4] = mips_REG_A4; 1603 tcp->u_arg[5] = mips_REG_A5; 1604#elif defined LINUX_MIPSN32 1605 (void)i; 1606 (void)nargs; 1607 tcp->u_arg[0] = tcp->ext_arg[0] = mips_REG_A0; 1608 tcp->u_arg[1] = tcp->ext_arg[1] = mips_REG_A1; 1609 tcp->u_arg[2] = tcp->ext_arg[2] = mips_REG_A2; 1610 tcp->u_arg[3] = tcp->ext_arg[3] = mips_REG_A3; 1611 tcp->u_arg[4] = tcp->ext_arg[4] = mips_REG_A4; 1612 tcp->u_arg[5] = tcp->ext_arg[5] = mips_REG_A5; 1613#elif defined LINUX_MIPSO32 1614 (void)i; 1615 (void)nargs; 1616 tcp->u_arg[0] = mips_REG_A0; 1617 tcp->u_arg[1] = mips_REG_A1; 1618 tcp->u_arg[2] = mips_REG_A2; 1619 tcp->u_arg[3] = mips_REG_A3; 1620 if (nargs > 4) { 1621 umoven(tcp, mips_REG_SP + 4 * 4, 1622 (nargs - 4) * sizeof(tcp->u_arg[0]), 1623 (char *)(tcp->u_arg + 4)); 1624 } 1625#elif defined(POWERPC) 1626 (void)i; 1627 (void)nargs; 1628 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1629 tcp->u_arg[1] = ppc_regs.gpr[4]; 1630 tcp->u_arg[2] = ppc_regs.gpr[5]; 1631 tcp->u_arg[3] = ppc_regs.gpr[6]; 1632 tcp->u_arg[4] = ppc_regs.gpr[7]; 1633 tcp->u_arg[5] = ppc_regs.gpr[8]; 1634#elif defined(SPARC) || defined(SPARC64) 1635 for (i = 0; i < nargs; ++i) 1636 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1637#elif defined(HPPA) 1638 for (i = 0; i < nargs; ++i) 1639 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1640 return -1; 1641#elif defined(ARM) || defined(AARCH64) 1642# if defined(AARCH64) 1643 if (tcp->currpers == 1) 1644 for (i = 0; i < nargs; ++i) 1645 tcp->u_arg[i] = aarch64_regs.regs[i]; 1646 else 1647# endif 1648 for (i = 0; i < nargs; ++i) 1649 tcp->u_arg[i] = arm_regs.uregs[i]; 1650#elif defined(AVR32) 1651 (void)i; 1652 (void)nargs; 1653 tcp->u_arg[0] = avr32_regs.r12; 1654 tcp->u_arg[1] = avr32_regs.r11; 1655 tcp->u_arg[2] = avr32_regs.r10; 1656 tcp->u_arg[3] = avr32_regs.r9; 1657 tcp->u_arg[4] = avr32_regs.r5; 1658 tcp->u_arg[5] = avr32_regs.r3; 1659#elif defined(BFIN) 1660 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1661 1662 for (i = 0; i < nargs; ++i) 1663 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1664 return -1; 1665#elif defined(SH) 1666 static const int syscall_regs[MAX_ARGS] = { 1667 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1668 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1669 }; 1670 1671 for (i = 0; i < nargs; ++i) 1672 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1673 return -1; 1674#elif defined(SH64) 1675 int i; 1676 /* Registers used by SH5 Linux system calls for parameters */ 1677 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1678 1679 for (i = 0; i < nargs; ++i) 1680 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1681 return -1; 1682#elif defined(I386) 1683 (void)i; 1684 (void)nargs; 1685 tcp->u_arg[0] = i386_regs.ebx; 1686 tcp->u_arg[1] = i386_regs.ecx; 1687 tcp->u_arg[2] = i386_regs.edx; 1688 tcp->u_arg[3] = i386_regs.esi; 1689 tcp->u_arg[4] = i386_regs.edi; 1690 tcp->u_arg[5] = i386_regs.ebp; 1691#elif defined(X86_64) || defined(X32) 1692 (void)i; 1693 (void)nargs; 1694 if (x86_io.iov_len != sizeof(i386_regs)) { 1695 /* x86-64 or x32 ABI */ 1696 tcp->u_arg[0] = x86_64_regs.rdi; 1697 tcp->u_arg[1] = x86_64_regs.rsi; 1698 tcp->u_arg[2] = x86_64_regs.rdx; 1699 tcp->u_arg[3] = x86_64_regs.r10; 1700 tcp->u_arg[4] = x86_64_regs.r8; 1701 tcp->u_arg[5] = x86_64_regs.r9; 1702# ifdef X32 1703 tcp->ext_arg[0] = x86_64_regs.rdi; 1704 tcp->ext_arg[1] = x86_64_regs.rsi; 1705 tcp->ext_arg[2] = x86_64_regs.rdx; 1706 tcp->ext_arg[3] = x86_64_regs.r10; 1707 tcp->ext_arg[4] = x86_64_regs.r8; 1708 tcp->ext_arg[5] = x86_64_regs.r9; 1709# endif 1710 } else { 1711 /* i386 ABI */ 1712 /* Zero-extend from 32 bits */ 1713 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1714 * if you need to use *sign-extended* parameter. 1715 */ 1716 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1717 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1718 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1719 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1720 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1721 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1722 } 1723#elif defined(MICROBLAZE) 1724 for (i = 0; i < nargs; ++i) 1725 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1726 return -1; 1727#elif defined(CRISV10) || defined(CRISV32) 1728 static const int crisregs[MAX_ARGS] = { 1729 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1730 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1731 }; 1732 1733 for (i = 0; i < nargs; ++i) 1734 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1735 return -1; 1736#elif defined(TILE) 1737 for (i = 0; i < nargs; ++i) 1738 tcp->u_arg[i] = tile_regs.regs[i]; 1739#elif defined(M68K) 1740 for (i = 0; i < nargs; ++i) 1741 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1742 return -1; 1743#elif defined(OR1K) 1744 (void)nargs; 1745 for (i = 0; i < 6; ++i) 1746 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1747#elif defined(METAG) 1748 for (i = 0; i < nargs; i++) 1749 /* arguments go backwards from D1Ar1 (D1.3) */ 1750 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1751#elif defined(XTENSA) 1752 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1753 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1754 for (i = 0; i < nargs; ++i) 1755 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1756 return -1; 1757# elif defined(ARC) 1758 long *arc_args = &arc_regs.scratch.r0; 1759 for (i = 0; i < nargs; ++i) 1760 tcp->u_arg[i] = *arc_args--; 1761 1762#else /* Other architecture (32bits specific) */ 1763 for (i = 0; i < nargs; ++i) 1764 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 1765 return -1; 1766#endif 1767 return 1; 1768} 1769 1770static int 1771trace_syscall_entering(struct tcb *tcp) 1772{ 1773 int res, scno_good; 1774 1775 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 1776 if (res == 0) 1777 return res; 1778 if (res == 1) 1779 res = get_syscall_args(tcp); 1780 1781 if (res != 1) { 1782 printleader(tcp); 1783 if (scno_good != 1) 1784 tprints("????" /* anti-trigraph gap */ "("); 1785 else if (tcp->qual_flg & UNDEFINED_SCNO) 1786 tprintf("%s(", undefined_scno_name(tcp)); 1787 else 1788 tprintf("%s(", tcp->s_ent->sys_name); 1789 /* 1790 * " <unavailable>" will be added later by the code which 1791 * detects ptrace errors. 1792 */ 1793 goto ret; 1794 } 1795 1796 if ( sys_execve == tcp->s_ent->sys_func 1797# if defined(SPARC) || defined(SPARC64) 1798 || sys_execv == tcp->s_ent->sys_func 1799# endif 1800 ) { 1801 hide_log_until_execve = 0; 1802 } 1803 1804#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 1805 while (1) { 1806# ifdef SYS_socket_subcall 1807 if (tcp->s_ent->sys_func == sys_socketcall) { 1808 decode_socket_subcall(tcp); 1809 break; 1810 } 1811# endif 1812# ifdef SYS_ipc_subcall 1813 if (tcp->s_ent->sys_func == sys_ipc) { 1814 decode_ipc_subcall(tcp); 1815 break; 1816 } 1817# endif 1818 break; 1819 } 1820#endif 1821 1822 if (!(tcp->qual_flg & QUAL_TRACE) 1823 || (tracing_paths && !pathtrace_match(tcp)) 1824 ) { 1825 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 1826 return 0; 1827 } 1828 1829 tcp->flags &= ~TCB_FILTERED; 1830 1831 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 1832 res = 0; 1833 goto ret; 1834 } 1835 1836#ifdef USE_LIBUNWIND 1837 if (stack_trace_enabled) { 1838 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER) 1839 unwind_capture_stacktrace(tcp); 1840 } 1841#endif 1842 1843 printleader(tcp); 1844 if (tcp->qual_flg & UNDEFINED_SCNO) 1845 tprintf("%s(", undefined_scno_name(tcp)); 1846 else 1847 tprintf("%s(", tcp->s_ent->sys_name); 1848 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 1849 res = printargs(tcp); 1850 else 1851 res = tcp->s_ent->sys_func(tcp); 1852 1853 fflush(tcp->outf); 1854 ret: 1855 tcp->flags |= TCB_INSYSCALL; 1856 /* Measure the entrance time as late as possible to avoid errors. */ 1857 if (Tflag || cflag) 1858 gettimeofday(&tcp->etime, NULL); 1859 return res; 1860} 1861 1862/* Returns: 1863 * 1: ok, continue in trace_syscall_exiting(). 1864 * -1: error, trace_syscall_exiting() should print error indicator 1865 * ("????" etc) and bail out. 1866 */ 1867static int 1868get_syscall_result(struct tcb *tcp) 1869{ 1870#if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS 1871 /* already done by get_regs */ 1872#elif defined(BFIN) 1873 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 1874 return -1; 1875#elif defined(IA64) 1876# define IA64_PSR_IS ((long)1 << 34) 1877 long psr; 1878 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1879 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1880 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1881 return -1; 1882 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1883 return -1; 1884#elif defined(M68K) 1885 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1886 return -1; 1887#elif defined(ALPHA) 1888 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1889 return -1; 1890 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 1891 return -1; 1892#elif defined(HPPA) 1893 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 1894 return -1; 1895#elif defined(SH) 1896 /* new syscall ABI returns result in R0 */ 1897 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 1898 return -1; 1899#elif defined(SH64) 1900 /* ABI defines result returned in r9 */ 1901 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 1902 return -1; 1903#elif defined(CRISV10) || defined(CRISV32) 1904 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1905 return -1; 1906#elif defined(MICROBLAZE) 1907 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1908 return -1; 1909#elif defined(XTENSA) 1910 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 1911 return -1; 1912#else 1913# error get_syscall_result is not implemented for this architecture 1914#endif 1915 return 1; 1916} 1917 1918/* Returns: 1919 * 1: ok, continue in trace_syscall_exiting(). 1920 * -1: error, trace_syscall_exiting() should print error indicator 1921 * ("????" etc) and bail out. 1922 */ 1923static void 1924get_error(struct tcb *tcp) 1925{ 1926 int u_error = 0; 1927 int check_errno = 1; 1928 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 1929 check_errno = 0; 1930 } 1931#if defined(S390) || defined(S390X) 1932 if (check_errno && is_negated_errno(s390_regset.gprs[2])) { 1933 tcp->u_rval = -1; 1934 u_error = -s390_regset.gprs[2]; 1935 } 1936 else { 1937 tcp->u_rval = s390_regset.gprs[2]; 1938 } 1939#elif defined(I386) 1940 if (check_errno && is_negated_errno(i386_regs.eax)) { 1941 tcp->u_rval = -1; 1942 u_error = -i386_regs.eax; 1943 } 1944 else { 1945 tcp->u_rval = i386_regs.eax; 1946 } 1947#elif defined(X86_64) || defined(X32) 1948 /* 1949 * In X32, return value is 64-bit (llseek uses one). 1950 * Using merely "long rax" would not work. 1951 */ 1952 kernel_long_t rax; 1953 1954 if (x86_io.iov_len == sizeof(i386_regs)) { 1955 /* Sign extend from 32 bits */ 1956 rax = (int32_t) i386_regs.eax; 1957 } else { 1958 rax = x86_64_regs.rax; 1959 } 1960 if (check_errno && is_negated_errno(rax)) { 1961 tcp->u_rval = -1; 1962 u_error = -rax; 1963 } 1964 else { 1965 tcp->u_rval = rax; 1966# ifdef X32 1967 /* tcp->u_rval contains a truncated value */ 1968 tcp->u_lrval = rax; 1969# endif 1970 } 1971#elif defined(IA64) 1972 if (ia64_ia32mode) { 1973 int err; 1974 1975 err = (int)ia64_r8; 1976 if (check_errno && is_negated_errno(err)) { 1977 tcp->u_rval = -1; 1978 u_error = -err; 1979 } 1980 else { 1981 tcp->u_rval = err; 1982 } 1983 } else { 1984 if (check_errno && ia64_r10) { 1985 tcp->u_rval = -1; 1986 u_error = ia64_r8; 1987 } else { 1988 tcp->u_rval = ia64_r8; 1989 } 1990 } 1991#elif defined(MIPS) 1992 if (check_errno && mips_REG_A3) { 1993 tcp->u_rval = -1; 1994 u_error = mips_REG_V0; 1995 } else { 1996# if defined LINUX_MIPSN32 1997 tcp->u_lrval = mips_REG_V0; 1998# endif 1999 tcp->u_rval = mips_REG_V0; 2000 } 2001#elif defined(POWERPC) 2002 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2003 tcp->u_rval = -1; 2004 u_error = ppc_regs.gpr[3]; 2005 } 2006 else { 2007 tcp->u_rval = ppc_regs.gpr[3]; 2008 } 2009#elif defined(M68K) 2010 if (check_errno && is_negated_errno(m68k_d0)) { 2011 tcp->u_rval = -1; 2012 u_error = -m68k_d0; 2013 } 2014 else { 2015 tcp->u_rval = m68k_d0; 2016 } 2017#elif defined(ARM) || defined(AARCH64) 2018# if defined(AARCH64) 2019 if (tcp->currpers == 1) { 2020 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2021 tcp->u_rval = -1; 2022 u_error = -aarch64_regs.regs[0]; 2023 } 2024 else { 2025 tcp->u_rval = aarch64_regs.regs[0]; 2026 } 2027 } 2028 else 2029# endif 2030 { 2031 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2032 tcp->u_rval = -1; 2033 u_error = -arm_regs.ARM_r0; 2034 } 2035 else { 2036 tcp->u_rval = arm_regs.ARM_r0; 2037 } 2038 } 2039#elif defined(AVR32) 2040 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2041 tcp->u_rval = -1; 2042 u_error = -avr32_regs.r12; 2043 } 2044 else { 2045 tcp->u_rval = avr32_regs.r12; 2046 } 2047#elif defined(BFIN) 2048 if (check_errno && is_negated_errno(bfin_r0)) { 2049 tcp->u_rval = -1; 2050 u_error = -bfin_r0; 2051 } else { 2052 tcp->u_rval = bfin_r0; 2053 } 2054#elif defined(ALPHA) 2055 if (check_errno && alpha_a3) { 2056 tcp->u_rval = -1; 2057 u_error = alpha_r0; 2058 } 2059 else { 2060 tcp->u_rval = alpha_r0; 2061 } 2062#elif defined(SPARC) 2063 if (check_errno && sparc_regs.psr & PSR_C) { 2064 tcp->u_rval = -1; 2065 u_error = sparc_regs.u_regs[U_REG_O0]; 2066 } 2067 else { 2068 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2069 } 2070#elif defined(SPARC64) 2071 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2072 tcp->u_rval = -1; 2073 u_error = sparc_regs.u_regs[U_REG_O0]; 2074 } 2075 else { 2076 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2077 } 2078#elif defined(HPPA) 2079 if (check_errno && is_negated_errno(hppa_r28)) { 2080 tcp->u_rval = -1; 2081 u_error = -hppa_r28; 2082 } 2083 else { 2084 tcp->u_rval = hppa_r28; 2085 } 2086#elif defined(SH) 2087 if (check_errno && is_negated_errno(sh_r0)) { 2088 tcp->u_rval = -1; 2089 u_error = -sh_r0; 2090 } 2091 else { 2092 tcp->u_rval = sh_r0; 2093 } 2094#elif defined(SH64) 2095 if (check_errno && is_negated_errno(sh64_r9)) { 2096 tcp->u_rval = -1; 2097 u_error = -sh64_r9; 2098 } 2099 else { 2100 tcp->u_rval = sh64_r9; 2101 } 2102#elif defined(METAG) 2103 /* result pointer in D0Re0 (D0.0) */ 2104 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2105 tcp->u_rval = -1; 2106 u_error = -metag_regs.dx[0][0]; 2107 } 2108 else { 2109 tcp->u_rval = metag_regs.dx[0][0]; 2110 } 2111#elif defined(CRISV10) || defined(CRISV32) 2112 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2113 tcp->u_rval = -1; 2114 u_error = -cris_r10; 2115 } 2116 else { 2117 tcp->u_rval = cris_r10; 2118 } 2119#elif defined(TILE) 2120 /* 2121 * The standard tile calling convention returns the value (or negative 2122 * errno) in r0, and zero (or positive errno) in r1. 2123 * Until at least kernel 3.8, however, the r1 value is not reflected 2124 * in ptregs at this point, so we use r0 here. 2125 */ 2126 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2127 tcp->u_rval = -1; 2128 u_error = -tile_regs.regs[0]; 2129 } else { 2130 tcp->u_rval = tile_regs.regs[0]; 2131 } 2132#elif defined(MICROBLAZE) 2133 if (check_errno && is_negated_errno(microblaze_r3)) { 2134 tcp->u_rval = -1; 2135 u_error = -microblaze_r3; 2136 } 2137 else { 2138 tcp->u_rval = microblaze_r3; 2139 } 2140#elif defined(OR1K) 2141 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2142 tcp->u_rval = -1; 2143 u_error = -or1k_regs.gpr[11]; 2144 } 2145 else { 2146 tcp->u_rval = or1k_regs.gpr[11]; 2147 } 2148#elif defined(XTENSA) 2149 if (check_errno && is_negated_errno(xtensa_a2)) { 2150 tcp->u_rval = -1; 2151 u_error = -xtensa_a2; 2152 } 2153 else { 2154 tcp->u_rval = xtensa_a2; 2155 } 2156#elif defined(ARC) 2157 if (check_errno && is_negated_errno(arc_regs.scratch.r0)) { 2158 tcp->u_rval = -1; 2159 u_error = -arc_regs.scratch.r0; 2160 } 2161 else { 2162 tcp->u_rval = arc_regs.scratch.r0; 2163 } 2164#endif 2165 tcp->u_error = u_error; 2166} 2167 2168static void 2169dumpio(struct tcb *tcp) 2170{ 2171 int (*func)(); 2172 2173 if (syserror(tcp)) 2174 return; 2175 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2176 return; 2177 func = tcp->s_ent->sys_func; 2178 if (func == printargs) 2179 return; 2180 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2181 if (func == sys_read || 2182 func == sys_pread || 2183 func == sys_recv || 2184 func == sys_recvfrom) { 2185 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2186 return; 2187 } else if (func == sys_readv) { 2188 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2189 return; 2190#if HAVE_SENDMSG 2191 } else if (func == sys_recvmsg) { 2192 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2193 return; 2194 } else if (func == sys_recvmmsg) { 2195 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2196 return; 2197#endif 2198 } 2199 } 2200 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2201 if (func == sys_write || 2202 func == sys_pwrite || 2203 func == sys_send || 2204 func == sys_sendto) 2205 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2206 else if (func == sys_writev) 2207 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2208#if HAVE_SENDMSG 2209 else if (func == sys_sendmsg) 2210 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2211 else if (func == sys_sendmmsg) 2212 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2213#endif 2214 } 2215} 2216 2217static int 2218trace_syscall_exiting(struct tcb *tcp) 2219{ 2220 int sys_res; 2221 struct timeval tv; 2222 int res; 2223 long u_error; 2224 2225 /* Measure the exit time as early as possible to avoid errors. */ 2226 if (Tflag || cflag) 2227 gettimeofday(&tv, NULL); 2228 2229#ifdef USE_LIBUNWIND 2230 if (stack_trace_enabled) { 2231 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE) 2232 unwind_cache_invalidate(tcp); 2233 } 2234#endif 2235 2236#if SUPPORTED_PERSONALITIES > 1 2237 update_personality(tcp, tcp->currpers); 2238#endif 2239 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2240 if (res == 1) { 2241 get_error(tcp); /* never fails */ 2242 if (filtered(tcp) || hide_log_until_execve) 2243 goto ret; 2244 } 2245 2246 if (cflag) { 2247 count_syscall(tcp, &tv); 2248 if (cflag == CFLAG_ONLY_STATS) { 2249 goto ret; 2250 } 2251 } 2252 2253 /* If not in -ff mode, and printing_tcp != tcp, 2254 * then the log currently does not end with output 2255 * of _our syscall entry_, but with something else. 2256 * We need to say which syscall's return is this. 2257 * 2258 * Forced reprinting via TCB_REPRINT is used only by 2259 * "strace -ff -oLOG test/threaded_execve" corner case. 2260 * It's the only case when -ff mode needs reprinting. 2261 */ 2262 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2263 tcp->flags &= ~TCB_REPRINT; 2264 printleader(tcp); 2265 if (tcp->qual_flg & UNDEFINED_SCNO) 2266 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2267 else 2268 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2269 } 2270 printing_tcp = tcp; 2271 2272 if (res != 1) { 2273 /* There was error in one of prior ptrace ops */ 2274 tprints(") "); 2275 tabto(); 2276 tprints("= ? <unavailable>\n"); 2277 line_ended(); 2278 tcp->flags &= ~TCB_INSYSCALL; 2279 return res; 2280 } 2281 2282 sys_res = 0; 2283 if (tcp->qual_flg & QUAL_RAW) { 2284 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2285 } else { 2286 /* FIXME: not_failing_only (IOW, option -z) is broken: 2287 * failure of syscall is known only after syscall return. 2288 * Thus we end up with something like this on, say, ENOENT: 2289 * open("doesnt_exist", O_RDONLY <unfinished ...> 2290 * {next syscall decode} 2291 * whereas the intended result is that open(...) line 2292 * is not shown at all. 2293 */ 2294 if (not_failing_only && tcp->u_error) 2295 goto ret; /* ignore failed syscalls */ 2296 sys_res = tcp->s_ent->sys_func(tcp); 2297 } 2298 2299 tprints(") "); 2300 tabto(); 2301 u_error = tcp->u_error; 2302 if (tcp->qual_flg & QUAL_RAW) { 2303 if (u_error) 2304 tprintf("= -1 (errno %ld)", u_error); 2305 else 2306 tprintf("= %#lx", tcp->u_rval); 2307 } 2308 else if (!(sys_res & RVAL_NONE) && u_error) { 2309 switch (u_error) { 2310 /* Blocked signals do not interrupt any syscalls. 2311 * In this case syscalls don't return ERESTARTfoo codes. 2312 * 2313 * Deadly signals set to SIG_DFL interrupt syscalls 2314 * and kill the process regardless of which of the codes below 2315 * is returned by the interrupted syscall. 2316 * In some cases, kernel forces a kernel-generated deadly 2317 * signal to be unblocked and set to SIG_DFL (and thus cause 2318 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2319 * or SIGILL. (The alternative is to leave process spinning 2320 * forever on the faulty instruction - not useful). 2321 * 2322 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2323 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2324 * but kernel will always restart them. 2325 */ 2326 case ERESTARTSYS: 2327 /* Most common type of signal-interrupted syscall exit code. 2328 * The system call will be restarted with the same arguments 2329 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2330 */ 2331 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2332 break; 2333 case ERESTARTNOINTR: 2334 /* Rare. For example, fork() returns this if interrupted. 2335 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2336 */ 2337 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2338 break; 2339 case ERESTARTNOHAND: 2340 /* pause(), rt_sigsuspend() etc use this code. 2341 * SA_RESTART is ignored (assumed not set): 2342 * syscall won't restart (will return EINTR instead) 2343 * even after signal with SA_RESTART set. However, 2344 * after SIG_IGN or SIG_DFL signal it will restart 2345 * (thus the name "restart only if has no handler"). 2346 */ 2347 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2348 break; 2349 case ERESTART_RESTARTBLOCK: 2350 /* Syscalls like nanosleep(), poll() which can't be 2351 * restarted with their original arguments use this 2352 * code. Kernel will execute restart_syscall() instead, 2353 * which changes arguments before restarting syscall. 2354 * SA_RESTART is ignored (assumed not set) similarly 2355 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2356 * since restart data is saved in "restart block" 2357 * in task struct, and if signal handler uses a syscall 2358 * which in turn saves another such restart block, 2359 * old data is lost and restart becomes impossible) 2360 */ 2361 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2362 break; 2363 default: 2364 if ((unsigned long) u_error < nerrnos 2365 && errnoent[u_error]) 2366 tprintf("= -1 %s (%s)", errnoent[u_error], 2367 strerror(u_error)); 2368 else 2369 tprintf("= -1 ERRNO_%lu (%s)", u_error, 2370 strerror(u_error)); 2371 break; 2372 } 2373 if ((sys_res & RVAL_STR) && tcp->auxstr) 2374 tprintf(" (%s)", tcp->auxstr); 2375 } 2376 else { 2377 if (sys_res & RVAL_NONE) 2378 tprints("= ?"); 2379 else { 2380 switch (sys_res & RVAL_MASK) { 2381 case RVAL_HEX: 2382#if SUPPORTED_PERSONALITIES > 1 2383 if (current_wordsize < sizeof(long)) 2384 tprintf("= %#x", 2385 (unsigned int) tcp->u_rval); 2386 else 2387#endif 2388 tprintf("= %#lx", tcp->u_rval); 2389 break; 2390 case RVAL_OCTAL: 2391 tprintf("= %#lo", tcp->u_rval); 2392 break; 2393 case RVAL_UDECIMAL: 2394 tprintf("= %lu", tcp->u_rval); 2395 break; 2396 case RVAL_DECIMAL: 2397 tprintf("= %ld", tcp->u_rval); 2398 break; 2399 case RVAL_FD: 2400 if (show_fd_path) { 2401 tprints("= "); 2402 printfd(tcp, tcp->u_rval); 2403 } 2404 else 2405 tprintf("= %ld", tcp->u_rval); 2406 break; 2407#if defined(LINUX_MIPSN32) || defined(X32) 2408 /* 2409 case RVAL_LHEX: 2410 tprintf("= %#llx", tcp->u_lrval); 2411 break; 2412 case RVAL_LOCTAL: 2413 tprintf("= %#llo", tcp->u_lrval); 2414 break; 2415 */ 2416 case RVAL_LUDECIMAL: 2417 tprintf("= %llu", tcp->u_lrval); 2418 break; 2419 /* 2420 case RVAL_LDECIMAL: 2421 tprintf("= %lld", tcp->u_lrval); 2422 break; 2423 */ 2424#endif 2425 default: 2426 fprintf(stderr, 2427 "invalid rval format\n"); 2428 break; 2429 } 2430 } 2431 if ((sys_res & RVAL_STR) && tcp->auxstr) 2432 tprintf(" (%s)", tcp->auxstr); 2433 } 2434 if (Tflag) { 2435 tv_sub(&tv, &tv, &tcp->etime); 2436 tprintf(" <%ld.%06ld>", 2437 (long) tv.tv_sec, (long) tv.tv_usec); 2438 } 2439 tprints("\n"); 2440 dumpio(tcp); 2441 line_ended(); 2442 2443#ifdef USE_LIBUNWIND 2444 if (stack_trace_enabled) 2445 unwind_print_stacktrace(tcp); 2446#endif 2447 2448 ret: 2449 tcp->flags &= ~TCB_INSYSCALL; 2450 return 0; 2451} 2452 2453int 2454trace_syscall(struct tcb *tcp) 2455{ 2456 return exiting(tcp) ? 2457 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2458} 2459