syscall.c revision 7211dbcb2f8a43eb5d36bd15c7ba1267ba21e223
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; 698static struct iovec x86_io = { 699 .iov_base = &x86_regs_union 700}; 701# define ARCH_REGS_FOR_GETREGSET x86_regs_union 702# define ARCH_IOVEC_FOR_GETREGSET x86_io 703#elif defined(IA64) 704static bool ia64_ia32mode; 705static long ia64_r8, ia64_r10; 706#elif defined(POWERPC) 707struct pt_regs ppc_regs; /* not static */ 708# define ARCH_REGS_FOR_GETREGS ppc_regs 709#elif defined(M68K) 710static long m68k_d0; 711#elif defined(BFIN) 712static long bfin_r0; 713#elif defined(ARM) 714struct pt_regs arm_regs; /* not static */ 715# define ARCH_REGS_FOR_GETREGS arm_regs 716#elif defined(AARCH64) 717struct arm_pt_regs { 718 int uregs[18]; 719}; 720# define ARM_cpsr uregs[16] 721# define ARM_pc uregs[15] 722# define ARM_lr uregs[14] 723# define ARM_sp uregs[13] 724# define ARM_ip uregs[12] 725# define ARM_fp uregs[11] 726# define ARM_r10 uregs[10] 727# define ARM_r9 uregs[9] 728# define ARM_r8 uregs[8] 729# define ARM_r7 uregs[7] 730# define ARM_r6 uregs[6] 731# define ARM_r5 uregs[5] 732# define ARM_r4 uregs[4] 733# define ARM_r3 uregs[3] 734# define ARM_r2 uregs[2] 735# define ARM_r1 uregs[1] 736# define ARM_r0 uregs[0] 737# define ARM_ORIG_r0 uregs[17] 738static union { 739 struct user_pt_regs aarch64_r; 740 struct arm_pt_regs arm_r; 741} arm_regs_union; 742# define aarch64_regs arm_regs_union.aarch64_r 743# define arm_regs arm_regs_union.arm_r 744static struct iovec aarch64_io = { 745 .iov_base = &arm_regs_union 746}; 747# define ARCH_REGS_FOR_GETREGSET arm_regs_union 748# define ARCH_IOVEC_FOR_GETREGSET aarch64_io 749#elif defined(ALPHA) 750static long alpha_r0; 751static long alpha_a3; 752#elif defined(AVR32) 753static struct pt_regs avr32_regs; 754# define ARCH_REGS_FOR_GETREGS avr32_regs 755#elif defined(SPARC) || defined(SPARC64) 756struct pt_regs sparc_regs; /* not static */ 757# define ARCH_REGS_FOR_GETREGS sparc_regs 758#elif defined(MIPS) 759struct mips_regs mips_regs; /* not static */ 760/* PTRACE_GETREGS on MIPS is available since linux v2.6.15. */ 761# define ARCH_REGS_FOR_GETREGS mips_regs 762#elif defined(S390) || defined(S390X) 763static long s390_gpr2; 764#elif defined(HPPA) 765static long hppa_r28; 766#elif defined(SH) 767static long sh_r0; 768#elif defined(SH64) 769static long sh64_r9; 770#elif defined(CRISV10) || defined(CRISV32) 771static long cris_r10; 772#elif defined(TILE) 773struct pt_regs tile_regs; /* not static */ 774# define ARCH_REGS_FOR_GETREGS tile_regs 775#elif defined(MICROBLAZE) 776static long microblaze_r3; 777#elif defined(OR1K) 778static struct user_regs_struct or1k_regs; 779# define ARCH_REGS_FOR_GETREGSET or1k_regs 780#elif defined(METAG) 781static struct user_gp_regs metag_regs; 782# define ARCH_REGS_FOR_GETREGSET metag_regs 783#elif defined(XTENSA) 784static long xtensa_a2; 785# elif defined(ARC) 786static struct user_regs_struct arc_regs; 787# define ARCH_REGS_FOR_GETREGSET arc_regs 788#endif 789 790static long get_regs_error; 791 792void 793print_pc(struct tcb *tcp) 794{ 795 const char *fmt; 796 const char *bad; 797 798#ifdef current_wordsize 799# define pc_wordsize current_wordsize 800#else 801# define pc_wordsize personality_wordsize[tcp->currpers] 802#endif 803 804 if (pc_wordsize == 4) { 805 fmt = "[%08lx] "; 806 bad = "[????????] "; 807 } else { 808 fmt = "[%016lx] "; 809 bad = "[????????????????] "; 810 } 811 812#undef pc_wordsize 813#define PRINTBADPC tprints(bad) 814 815 if (get_regs_error) { 816 PRINTBADPC; 817 return; 818 } 819 820#if defined(I386) 821 tprintf(fmt, i386_regs.eip); 822#elif defined(X86_64) || defined(X32) 823 if (x86_io.iov_len == sizeof(i386_regs)) 824 tprintf(fmt, (unsigned long) i386_regs.eip); 825 else 826 tprintf(fmt, (unsigned long) x86_64_regs.rip); 827#elif defined(S390) || defined(S390X) 828 long psw; 829 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) { 830 PRINTBADPC; 831 return; 832 } 833 tprintf(fmt, psw); 834#elif defined(IA64) 835 long ip; 836 if (upeek(tcp->pid, PT_B0, &ip) < 0) { 837 PRINTBADPC; 838 return; 839 } 840 tprintf(fmt, ip); 841#elif defined(POWERPC) 842 tprintf(fmt, ppc_regs.nip); 843#elif defined(M68K) 844 long pc; 845 if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) { 846 PRINTBADPC; 847 return; 848 } 849 tprintf(fmt, pc); 850#elif defined(ALPHA) 851 long pc; 852 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 853 PRINTBADPC; 854 return; 855 } 856 tprintf(fmt, pc); 857#elif defined(SPARC) 858 tprintf(fmt, sparc_regs.pc); 859#elif defined(SPARC64) 860 tprintf(fmt, sparc_regs.tpc); 861#elif defined(HPPA) 862 long pc; 863 if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) { 864 PRINTBADPC; 865 return; 866 } 867 tprintf(fmt, pc); 868#elif defined MIPS 869 tprintf(fmt, (unsigned long) mips_REG_EPC); 870#elif defined(SH) 871 long pc; 872 if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) { 873 PRINTBADPC; 874 return; 875 } 876 tprintf(fmt, pc); 877#elif defined(SH64) 878 long pc; 879 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 880 PRINTBADPC; 881 return; 882 } 883 tprintf(fmt, pc); 884#elif defined(ARM) 885 tprintf(fmt, arm_regs.ARM_pc); 886#elif defined(AVR32) 887 tprintf(fmt, avr32_regs.pc); 888#elif defined(BFIN) 889 long pc; 890 if (upeek(tcp->pid, PT_PC, &pc) < 0) { 891 PRINTBADPC; 892 return; 893 } 894 tprintf(fmt, pc); 895#elif defined(CRISV10) 896 long pc; 897 if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) { 898 PRINTBADPC; 899 return; 900 } 901 tprintf(fmt, pc); 902#elif defined(CRISV32) 903 long pc; 904 if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) { 905 PRINTBADPC; 906 return; 907 } 908 tprintf(fmt, pc); 909#elif defined(TILE) 910 tprintf(fmt, (unsigned long) tile_regs.pc); 911#elif defined(OR1K) 912 tprintf(fmt, or1k_regs.pc); 913#elif defined(METAG) 914 tprintf(fmt, metag_regs.pc); 915#elif defined(XTENSA) 916 long pc; 917 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 918 PRINTBADPC; 919 return; 920 } 921 tprintf(fmt, pc); 922#elif defined(ARC) 923 tprintf(fmt, arc_regs.efa); 924#else 925# warning print_pc is not implemented for this architecture 926 PRINTBADPC; 927#endif /* architecture */ 928} 929 930/* 931 * Shuffle syscall numbers so that we don't have huge gaps in syscall table. 932 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n. 933 */ 934#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */ 935static long 936shuffle_scno(unsigned long scno) 937{ 938 if (scno < ARM_FIRST_SHUFFLED_SYSCALL) 939 return scno; 940 941 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */ 942 if (scno == ARM_FIRST_SHUFFLED_SYSCALL) 943 return 0x000ffff0; 944 if (scno == 0x000ffff0) 945 return ARM_FIRST_SHUFFLED_SYSCALL; 946 947#define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1) 948 /* 949 * Is it ARM specific syscall? 950 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range 951 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range. 952 */ 953 if (scno >= 0x000f0000 && 954 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) { 955 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL; 956 } 957 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) { 958 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL; 959 } 960 961 return scno; 962} 963#else 964# define shuffle_scno(scno) ((long)(scno)) 965#endif 966 967static char* 968undefined_scno_name(struct tcb *tcp) 969{ 970 static char buf[sizeof("syscall_%lu") + sizeof(long)*3]; 971 972 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno)); 973 return buf; 974} 975 976#ifdef POWERPC 977/* 978 * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23, 979 * we provide a slow fallback for old kernels. 980 */ 981static int powerpc_getregs_old(pid_t pid) 982{ 983 int i; 984 long r; 985 986 if (iflag) { 987 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip); 988 if (r) 989 goto out; 990 } 991#ifdef POWERPC64 /* else we never use it */ 992 r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr); 993 if (r) 994 goto out; 995#endif 996 r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr); 997 if (r) 998 goto out; 999 r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3); 1000 if (r) 1001 goto out; 1002 for (i = 0; i <= 8; i++) { 1003 r = upeek(pid, sizeof(long) * (PT_R0 + i), 1004 (long *)&ppc_regs.gpr[i]); 1005 if (r) 1006 goto out; 1007 } 1008 out: 1009 return r; 1010} 1011#endif 1012 1013void 1014clear_regs(void) 1015{ 1016 get_regs_error = -1; 1017} 1018 1019#if defined ARCH_REGS_FOR_GETREGSET 1020static long 1021get_regset(pid_t pid) 1022{ 1023# ifdef ARCH_IOVEC_FOR_GETREGSET 1024 /* variable iovec */ 1025 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET); 1026 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, 1027 &ARCH_IOVEC_FOR_GETREGSET); 1028# else 1029 /* constant iovec */ 1030 static struct iovec io = { 1031 .iov_base = &ARCH_REGS_FOR_GETREGSET, 1032 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET) 1033 }; 1034 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io); 1035 1036# endif 1037} 1038#endif /* ARCH_REGS_FOR_GETREGSET */ 1039 1040void 1041get_regs(pid_t pid) 1042{ 1043#ifdef ARCH_REGS_FOR_GETREGSET 1044# ifdef X86_64 1045 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */ 1046 static int getregset_support; 1047 1048 if (getregset_support >= 0) { 1049 get_regs_error = get_regset(pid); 1050 if (getregset_support > 0) 1051 return; 1052 if (get_regs_error >= 0) { 1053 getregset_support = 1; 1054 return; 1055 } 1056 if (errno == EPERM || errno == ESRCH) 1057 return; 1058 getregset_support = -1; 1059 } 1060 /* Use old method, with unreliable heuristical detection of 32-bitness. */ 1061 x86_io.iov_len = sizeof(x86_64_regs); 1062 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs); 1063 if (!get_regs_error && x86_64_regs.cs == 0x23) { 1064 x86_io.iov_len = sizeof(i386_regs); 1065 /* 1066 * The order is important: i386_regs and x86_64_regs 1067 * are overlaid in memory! 1068 */ 1069 i386_regs.ebx = x86_64_regs.rbx; 1070 i386_regs.ecx = x86_64_regs.rcx; 1071 i386_regs.edx = x86_64_regs.rdx; 1072 i386_regs.esi = x86_64_regs.rsi; 1073 i386_regs.edi = x86_64_regs.rdi; 1074 i386_regs.ebp = x86_64_regs.rbp; 1075 i386_regs.eax = x86_64_regs.rax; 1076 /* i386_regs.xds = x86_64_regs.ds; unused by strace */ 1077 /* i386_regs.xes = x86_64_regs.es; ditto... */ 1078 /* i386_regs.xfs = x86_64_regs.fs; */ 1079 /* i386_regs.xgs = x86_64_regs.gs; */ 1080 i386_regs.orig_eax = x86_64_regs.orig_rax; 1081 i386_regs.eip = x86_64_regs.rip; 1082 /* i386_regs.xcs = x86_64_regs.cs; */ 1083 /* i386_regs.eflags = x86_64_regs.eflags; */ 1084 i386_regs.esp = x86_64_regs.rsp; 1085 /* i386_regs.xss = x86_64_regs.ss; */ 1086 } 1087# else /* !X86_64 */ 1088 /* Assume that PTRACE_GETREGSET works. */ 1089 get_regs_error = get_regset(pid); 1090# endif 1091#elif defined ARCH_REGS_FOR_GETREGS 1092# if defined SPARC || defined SPARC64 1093 /* SPARC systems have the meaning of data and addr reversed */ 1094 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0); 1095# elif defined POWERPC 1096 static bool old_kernel = 0; 1097 if (old_kernel) 1098 goto old; 1099 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1100 if (get_regs_error && errno == EIO) { 1101 old_kernel = 1; 1102 old: 1103 get_regs_error = powerpc_getregs_old(pid); 1104 } 1105# else 1106 /* Assume that PTRACE_GETREGS works. */ 1107 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1108# endif 1109 1110#else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */ 1111# warning get_regs is not implemented for this architecture yet 1112 get_regs_error = 0; 1113#endif 1114} 1115 1116/* Returns: 1117 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1118 * 1: ok, continue in trace_syscall_entering(). 1119 * other: error, trace_syscall_entering() should print error indicator 1120 * ("????" etc) and bail out. 1121 */ 1122static int 1123get_scno(struct tcb *tcp) 1124{ 1125 long scno = 0; 1126 1127#if defined(S390) || defined(S390X) 1128 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1129 return -1; 1130 1131 if (s390_gpr2 != -ENOSYS) { 1132 /* 1133 * Since kernel version 2.5.44 the scno gets passed in gpr2. 1134 */ 1135 scno = s390_gpr2; 1136 } else { 1137 /* 1138 * Old style of "passing" the scno via the SVC instruction. 1139 */ 1140 long psw; 1141 long opcode, offset_reg, tmp; 1142 void *svc_addr; 1143 static const int gpr_offset[16] = { 1144 PT_GPR0, PT_GPR1, PT_ORIGGPR2, PT_GPR3, 1145 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, 1146 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, 1147 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15 1148 }; 1149 1150 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) 1151 return -1; 1152 errno = 0; 1153 opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0); 1154 if (errno) { 1155 perror_msg("peektext(psw-oneword)"); 1156 return -1; 1157 } 1158 1159 /* 1160 * We have to check if the SVC got executed directly or via an 1161 * EXECUTE instruction. In case of EXECUTE it is necessary to do 1162 * instruction decoding to derive the system call number. 1163 * Unfortunately the opcode sizes of EXECUTE and SVC are differently, 1164 * so that this doesn't work if a SVC opcode is part of an EXECUTE 1165 * opcode. Since there is no way to find out the opcode size this 1166 * is the best we can do... 1167 */ 1168 if ((opcode & 0xff00) == 0x0a00) { 1169 /* SVC opcode */ 1170 scno = opcode & 0xff; 1171 } 1172 else { 1173 /* SVC got executed by EXECUTE instruction */ 1174 1175 /* 1176 * Do instruction decoding of EXECUTE. If you really want to 1177 * understand this, read the Principles of Operations. 1178 */ 1179 svc_addr = (void *) (opcode & 0xfff); 1180 1181 tmp = 0; 1182 offset_reg = (opcode & 0x000f0000) >> 16; 1183 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1184 return -1; 1185 svc_addr += tmp; 1186 1187 tmp = 0; 1188 offset_reg = (opcode & 0x0000f000) >> 12; 1189 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1190 return -1; 1191 svc_addr += tmp; 1192 1193 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0); 1194 if (errno) 1195 return -1; 1196# if defined(S390X) 1197 scno >>= 48; 1198# else 1199 scno >>= 16; 1200# endif 1201 tmp = 0; 1202 offset_reg = (opcode & 0x00f00000) >> 20; 1203 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1204 return -1; 1205 1206 scno = (scno | tmp) & 0xff; 1207 } 1208 } 1209#elif defined(POWERPC) 1210 scno = ppc_regs.gpr[0]; 1211# ifdef POWERPC64 1212 unsigned int currpers; 1213 1214 /* 1215 * Check for 64/32 bit mode. 1216 * Embedded implementations covered by Book E extension of PPC use 1217 * bit 0 (CM) of 32-bit Machine state register (MSR). 1218 * Other implementations use bit 0 (SF) of 64-bit MSR. 1219 */ 1220 currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1; 1221 update_personality(tcp, currpers); 1222# endif 1223#elif defined(AVR32) 1224 scno = avr32_regs.r8; 1225#elif defined(BFIN) 1226 if (upeek(tcp->pid, PT_ORIG_P0, &scno)) 1227 return -1; 1228#elif defined(I386) 1229 scno = i386_regs.orig_eax; 1230#elif defined(X86_64) || defined(X32) 1231# ifndef __X32_SYSCALL_BIT 1232# define __X32_SYSCALL_BIT 0x40000000 1233# endif 1234 unsigned int currpers; 1235# if 1 1236 /* GETREGSET of NT_PRSTATUS tells us regset size, 1237 * which unambiguously detects i386. 1238 * 1239 * Linux kernel distinguishes x86-64 and x32 processes 1240 * solely by looking at __X32_SYSCALL_BIT: 1241 * arch/x86/include/asm/compat.h::is_x32_task(): 1242 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 1243 * return true; 1244 */ 1245 if (x86_io.iov_len == sizeof(i386_regs)) { 1246 scno = i386_regs.orig_eax; 1247 currpers = 1; 1248 } else { 1249 scno = x86_64_regs.orig_rax; 1250 currpers = 0; 1251 if (scno & __X32_SYSCALL_BIT) { 1252 /* 1253 * Syscall number -1 requires special treatment: 1254 * it might be a side effect of SECCOMP_RET_ERRNO 1255 * filtering that sets orig_rax to -1 1256 * in some versions of linux kernel. 1257 * If that is the case, then 1258 * __X32_SYSCALL_BIT logic does not apply. 1259 */ 1260 if ((long long) x86_64_regs.orig_rax != -1) { 1261 scno -= __X32_SYSCALL_BIT; 1262 currpers = 2; 1263 } else { 1264# ifdef X32 1265 currpers = 2; 1266# endif 1267 } 1268 } 1269 } 1270# elif 0 1271 /* cs = 0x33 for long mode (native 64 bit and x32) 1272 * cs = 0x23 for compatibility mode (32 bit) 1273 * ds = 0x2b for x32 mode (x86-64 in 32 bit) 1274 */ 1275 scno = x86_64_regs.orig_rax; 1276 switch (x86_64_regs.cs) { 1277 case 0x23: currpers = 1; break; 1278 case 0x33: 1279 if (x86_64_regs.ds == 0x2b) { 1280 currpers = 2; 1281 scno &= ~__X32_SYSCALL_BIT; 1282 } else 1283 currpers = 0; 1284 break; 1285 default: 1286 fprintf(stderr, "Unknown value CS=0x%08X while " 1287 "detecting personality of process " 1288 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid); 1289 currpers = current_personality; 1290 break; 1291 } 1292# elif 0 1293 /* This version analyzes the opcode of a syscall instruction. 1294 * (int 0x80 on i386 vs. syscall on x86-64) 1295 * It works, but is too complicated, and strictly speaking, unreliable. 1296 */ 1297 unsigned long call, rip = x86_64_regs.rip; 1298 /* sizeof(syscall) == sizeof(int 0x80) == 2 */ 1299 rip -= 2; 1300 errno = 0; 1301 call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0); 1302 if (errno) 1303 fprintf(stderr, "ptrace_peektext failed: %s\n", 1304 strerror(errno)); 1305 switch (call & 0xffff) { 1306 /* x86-64: syscall = 0x0f 0x05 */ 1307 case 0x050f: currpers = 0; break; 1308 /* i386: int 0x80 = 0xcd 0x80 */ 1309 case 0x80cd: currpers = 1; break; 1310 default: 1311 currpers = current_personality; 1312 fprintf(stderr, 1313 "Unknown syscall opcode (0x%04X) while " 1314 "detecting personality of process " 1315 "PID=%d\n", (int)call, tcp->pid); 1316 break; 1317 } 1318# endif 1319 1320# ifdef X32 1321 /* If we are built for a x32 system, then personality 0 is x32 1322 * (not x86_64), and stracing of x86_64 apps is not supported. 1323 * Stracing of i386 apps is still supported. 1324 */ 1325 if (currpers == 0) { 1326 fprintf(stderr, "syscall_%lu(...) in unsupported " 1327 "64-bit mode of process PID=%d\n", 1328 scno, tcp->pid); 1329 return 0; 1330 } 1331 currpers &= ~2; /* map 2,1 to 0,1 */ 1332# endif 1333 update_personality(tcp, currpers); 1334#elif defined(IA64) 1335# define IA64_PSR_IS ((long)1 << 34) 1336 long psr; 1337 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1338 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1339 if (ia64_ia32mode) { 1340 if (upeek(tcp->pid, PT_R1, &scno) < 0) 1341 return -1; 1342 } else { 1343 if (upeek(tcp->pid, PT_R15, &scno) < 0) 1344 return -1; 1345 } 1346#elif defined(AARCH64) 1347 switch (aarch64_io.iov_len) { 1348 case sizeof(aarch64_regs): 1349 /* We are in 64-bit mode */ 1350 scno = aarch64_regs.regs[8]; 1351 update_personality(tcp, 1); 1352 break; 1353 case sizeof(arm_regs): 1354 /* We are in 32-bit mode */ 1355 /* Note: we don't support OABI, unlike 32-bit ARM build */ 1356 scno = arm_regs.ARM_r7; 1357 scno = shuffle_scno(scno); 1358 update_personality(tcp, 0); 1359 break; 1360 } 1361#elif defined(ARM) 1362 if (arm_regs.ARM_ip != 0) { 1363 /* It is not a syscall entry */ 1364 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid); 1365 tcp->flags |= TCB_INSYSCALL; 1366 return 0; 1367 } 1368 /* Note: we support only 32-bit CPUs, not 26-bit */ 1369 1370# if !defined(__ARM_EABI__) || ENABLE_ARM_OABI 1371 if (arm_regs.ARM_cpsr & 0x20) 1372 /* Thumb mode */ 1373 goto scno_in_r7; 1374 /* ARM mode */ 1375 /* Check EABI/OABI by examining SVC insn's low 24 bits */ 1376 errno = 0; 1377 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); 1378 if (errno) 1379 return -1; 1380 /* EABI syscall convention? */ 1381 if ((unsigned long) scno != 0xef000000) { 1382 /* No, it's OABI */ 1383 if ((scno & 0x0ff00000) != 0x0f900000) { 1384 fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n", 1385 tcp->pid, scno); 1386 return -1; 1387 } 1388 /* Fixup the syscall number */ 1389 scno &= 0x000fffff; 1390 } else { 1391 scno_in_r7: 1392 scno = arm_regs.ARM_r7; 1393 } 1394# else /* __ARM_EABI__ || !ENABLE_ARM_OABI */ 1395 scno = arm_regs.ARM_r7; 1396# endif 1397 scno = shuffle_scno(scno); 1398#elif defined(M68K) 1399 if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0) 1400 return -1; 1401#elif defined(MIPS) 1402 scno = mips_REG_V0; 1403 1404 if (!SCNO_IN_RANGE(scno)) { 1405 if (mips_REG_A3 == 0 || mips_REG_A3 == -1) { 1406 if (debug_flag) 1407 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1408 return 0; 1409 } 1410 } 1411#elif defined(ALPHA) 1412 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1413 return -1; 1414 if (upeek(tcp->pid, REG_R0, &scno) < 0) 1415 return -1; 1416 1417 /* 1418 * Do some sanity checks to figure out if it's 1419 * really a syscall entry 1420 */ 1421 if (!SCNO_IN_RANGE(scno)) { 1422 if (alpha_a3 == 0 || alpha_a3 == -1) { 1423 if (debug_flag) 1424 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno); 1425 return 0; 1426 } 1427 } 1428#elif defined(SPARC) || defined(SPARC64) 1429 /* Disassemble the syscall trap. */ 1430 /* Retrieve the syscall trap instruction. */ 1431 unsigned long trap; 1432 errno = 0; 1433# if defined(SPARC64) 1434 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0); 1435 trap >>= 32; 1436# else 1437 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0); 1438# endif 1439 if (errno) 1440 return -1; 1441 1442 /* Disassemble the trap to see what personality to use. */ 1443 switch (trap) { 1444 case 0x91d02010: 1445 /* Linux/SPARC syscall trap. */ 1446 update_personality(tcp, 0); 1447 break; 1448 case 0x91d0206d: 1449 /* Linux/SPARC64 syscall trap. */ 1450 update_personality(tcp, 2); 1451 break; 1452 case 0x91d02000: 1453 /* SunOS syscall trap. (pers 1) */ 1454 fprintf(stderr, "syscall: SunOS no support\n"); 1455 return -1; 1456 case 0x91d02008: 1457 /* Solaris 2.x syscall trap. (per 2) */ 1458 update_personality(tcp, 1); 1459 break; 1460 case 0x91d02009: 1461 /* NetBSD/FreeBSD syscall trap. */ 1462 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n"); 1463 return -1; 1464 case 0x91d02027: 1465 /* Solaris 2.x gettimeofday */ 1466 update_personality(tcp, 1); 1467 break; 1468 default: 1469# if defined(SPARC64) 1470 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc); 1471# else 1472 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc); 1473# endif 1474 return -1; 1475 } 1476 1477 /* Extract the system call number from the registers. */ 1478 if (trap == 0x91d02027) 1479 scno = 156; 1480 else 1481 scno = sparc_regs.u_regs[U_REG_G1]; 1482 if (scno == 0) { 1483 scno = sparc_regs.u_regs[U_REG_O0]; 1484 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0])); 1485 } 1486#elif defined(HPPA) 1487 if (upeek(tcp->pid, PT_GR20, &scno) < 0) 1488 return -1; 1489#elif defined(SH) 1490 /* 1491 * In the new syscall ABI, the system call number is in R3. 1492 */ 1493 if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0) 1494 return -1; 1495 1496 if (scno < 0) { 1497 /* Odd as it may seem, a glibc bug has been known to cause 1498 glibc to issue bogus negative syscall numbers. So for 1499 our purposes, make strace print what it *should* have been */ 1500 long correct_scno = (scno & 0xff); 1501 if (debug_flag) 1502 fprintf(stderr, 1503 "Detected glibc bug: bogus system call" 1504 " number = %ld, correcting to %ld\n", 1505 scno, 1506 correct_scno); 1507 scno = correct_scno; 1508 } 1509#elif defined(SH64) 1510 if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0) 1511 return -1; 1512 scno &= 0xFFFF; 1513#elif defined(CRISV10) || defined(CRISV32) 1514 if (upeek(tcp->pid, 4*PT_R9, &scno) < 0) 1515 return -1; 1516#elif defined(TILE) 1517 unsigned int currpers; 1518 scno = tile_regs.regs[10]; 1519# ifdef __tilepro__ 1520 currpers = 1; 1521# else 1522# ifndef PT_FLAGS_COMPAT 1523# define PT_FLAGS_COMPAT 0x10000 /* from Linux 3.8 on */ 1524# endif 1525 if (tile_regs.flags & PT_FLAGS_COMPAT) 1526 currpers = 1; 1527 else 1528 currpers = 0; 1529# endif 1530 update_personality(tcp, currpers); 1531#elif defined(MICROBLAZE) 1532 if (upeek(tcp->pid, 0, &scno) < 0) 1533 return -1; 1534#elif defined(OR1K) 1535 scno = or1k_regs.gpr[11]; 1536#elif defined(METAG) 1537 scno = metag_regs.dx[0][1]; /* syscall number in D1Re0 (D1.0) */ 1538#elif defined(XTENSA) 1539 if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0) 1540 return -1; 1541# elif defined(ARC) 1542 scno = arc_regs.scratch.r8; 1543#endif 1544 1545 tcp->scno = scno; 1546 if (SCNO_IS_VALID(tcp->scno)) { 1547 tcp->s_ent = &sysent[scno]; 1548 tcp->qual_flg = qual_flags[scno]; 1549 } else { 1550 static const struct_sysent unknown = { 1551 .nargs = MAX_ARGS, 1552 .sys_flags = 0, 1553 .sys_func = printargs, 1554 .sys_name = "unknown", /* not used */ 1555 }; 1556 tcp->s_ent = &unknown; 1557 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS; 1558 } 1559 return 1; 1560} 1561 1562/* 1563 * Cannot rely on __kernel_[u]long_t being defined, 1564 * it is quite a recent feature of <asm/posix_types.h>. 1565 */ 1566#ifdef __kernel_long_t 1567typedef __kernel_long_t kernel_long_t; 1568typedef __kernel_ulong_t kernel_ulong_t; 1569#else 1570# ifdef X32 1571typedef long long kernel_long_t; 1572typedef unsigned long long kernel_ulong_t; 1573# else 1574typedef long kernel_long_t; 1575typedef unsigned long kernel_ulong_t; 1576# endif 1577#endif 1578 1579/* 1580 * Check the syscall return value register value for whether it is 1581 * a negated errno code indicating an error, or a success return value. 1582 */ 1583static inline bool 1584is_negated_errno(kernel_ulong_t val) 1585{ 1586 /* Linux kernel defines MAX_ERRNO to 4095. */ 1587 kernel_ulong_t max = -(kernel_long_t) 4095; 1588 1589#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 1590 if (current_wordsize < sizeof(val)) { 1591 val = (uint32_t) val; 1592 max = (uint32_t) max; 1593 } 1594#elif defined X32 1595 /* 1596 * current_wordsize is 4 even in personality 0 (native X32) 1597 * but truncation _must not_ be done in it. 1598 * can't check current_wordsize here! 1599 */ 1600 if (current_personality != 0) { 1601 val = (uint32_t) val; 1602 max = (uint32_t) max; 1603 } 1604#endif 1605 1606 return val >= max; 1607} 1608 1609/* Return -1 on error or 1 on success (never 0!) */ 1610static int 1611get_syscall_args(struct tcb *tcp) 1612{ 1613 int i, nargs; 1614 1615 nargs = tcp->s_ent->nargs; 1616 1617#if defined(S390) || defined(S390X) 1618 for (i = 0; i < nargs; ++i) 1619 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0) 1620 return -1; 1621#elif defined(ALPHA) 1622 for (i = 0; i < nargs; ++i) 1623 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1624 return -1; 1625#elif defined(IA64) 1626 if (!ia64_ia32mode) { 1627 unsigned long *out0, cfm, sof, sol; 1628 long rbs_end; 1629 /* be backwards compatible with kernel < 2.4.4... */ 1630# ifndef PT_RBS_END 1631# define PT_RBS_END PT_AR_BSP 1632# endif 1633 1634 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1635 return -1; 1636 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1637 return -1; 1638 1639 sof = (cfm >> 0) & 0x7f; 1640 sol = (cfm >> 7) & 0x7f; 1641 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1642 1643 for (i = 0; i < nargs; ++i) { 1644 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1645 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1646 return -1; 1647 } 1648 } else { 1649 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1650 PT_R9 /* ECX = out1 */, 1651 PT_R10 /* EDX = out2 */, 1652 PT_R14 /* ESI = out3 */, 1653 PT_R15 /* EDI = out4 */, 1654 PT_R13 /* EBP = out5 */}; 1655 1656 for (i = 0; i < nargs; ++i) { 1657 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1658 return -1; 1659 /* truncate away IVE sign-extension */ 1660 tcp->u_arg[i] &= 0xffffffff; 1661 } 1662 } 1663#elif defined LINUX_MIPSN64 1664 (void)i; 1665 (void)nargs; 1666 tcp->u_arg[0] = mips_REG_A0; 1667 tcp->u_arg[1] = mips_REG_A1; 1668 tcp->u_arg[2] = mips_REG_A2; 1669 tcp->u_arg[3] = mips_REG_A3; 1670 tcp->u_arg[4] = mips_REG_A4; 1671 tcp->u_arg[5] = mips_REG_A5; 1672#elif defined LINUX_MIPSN32 1673 (void)i; 1674 (void)nargs; 1675 tcp->u_arg[0] = tcp->ext_arg[0] = mips_REG_A0; 1676 tcp->u_arg[1] = tcp->ext_arg[1] = mips_REG_A1; 1677 tcp->u_arg[2] = tcp->ext_arg[2] = mips_REG_A2; 1678 tcp->u_arg[3] = tcp->ext_arg[3] = mips_REG_A3; 1679 tcp->u_arg[4] = tcp->ext_arg[4] = mips_REG_A4; 1680 tcp->u_arg[5] = tcp->ext_arg[5] = mips_REG_A5; 1681#elif defined LINUX_MIPSO32 1682 (void)i; 1683 (void)nargs; 1684 tcp->u_arg[0] = mips_REG_A0; 1685 tcp->u_arg[1] = mips_REG_A1; 1686 tcp->u_arg[2] = mips_REG_A2; 1687 tcp->u_arg[3] = mips_REG_A3; 1688 if (nargs > 4) { 1689 umoven(tcp, mips_REG_SP + 4 * 4, 1690 (nargs - 4) * sizeof(tcp->u_arg[0]), 1691 (char *)(tcp->u_arg + 4)); 1692 } 1693#elif defined(POWERPC) 1694 (void)i; 1695 (void)nargs; 1696 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1697 tcp->u_arg[1] = ppc_regs.gpr[4]; 1698 tcp->u_arg[2] = ppc_regs.gpr[5]; 1699 tcp->u_arg[3] = ppc_regs.gpr[6]; 1700 tcp->u_arg[4] = ppc_regs.gpr[7]; 1701 tcp->u_arg[5] = ppc_regs.gpr[8]; 1702#elif defined(SPARC) || defined(SPARC64) 1703 for (i = 0; i < nargs; ++i) 1704 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1705#elif defined(HPPA) 1706 for (i = 0; i < nargs; ++i) 1707 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1708 return -1; 1709#elif defined(ARM) || defined(AARCH64) 1710# if defined(AARCH64) 1711 if (tcp->currpers == 1) 1712 for (i = 0; i < nargs; ++i) 1713 tcp->u_arg[i] = aarch64_regs.regs[i]; 1714 else 1715# endif 1716 for (i = 0; i < nargs; ++i) 1717 tcp->u_arg[i] = arm_regs.uregs[i]; 1718#elif defined(AVR32) 1719 (void)i; 1720 (void)nargs; 1721 tcp->u_arg[0] = avr32_regs.r12; 1722 tcp->u_arg[1] = avr32_regs.r11; 1723 tcp->u_arg[2] = avr32_regs.r10; 1724 tcp->u_arg[3] = avr32_regs.r9; 1725 tcp->u_arg[4] = avr32_regs.r5; 1726 tcp->u_arg[5] = avr32_regs.r3; 1727#elif defined(BFIN) 1728 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1729 1730 for (i = 0; i < nargs; ++i) 1731 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1732 return -1; 1733#elif defined(SH) 1734 static const int syscall_regs[MAX_ARGS] = { 1735 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1736 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1737 }; 1738 1739 for (i = 0; i < nargs; ++i) 1740 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1741 return -1; 1742#elif defined(SH64) 1743 int i; 1744 /* Registers used by SH5 Linux system calls for parameters */ 1745 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1746 1747 for (i = 0; i < nargs; ++i) 1748 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1749 return -1; 1750#elif defined(I386) 1751 (void)i; 1752 (void)nargs; 1753 tcp->u_arg[0] = i386_regs.ebx; 1754 tcp->u_arg[1] = i386_regs.ecx; 1755 tcp->u_arg[2] = i386_regs.edx; 1756 tcp->u_arg[3] = i386_regs.esi; 1757 tcp->u_arg[4] = i386_regs.edi; 1758 tcp->u_arg[5] = i386_regs.ebp; 1759#elif defined(X86_64) || defined(X32) 1760 (void)i; 1761 (void)nargs; 1762 if (x86_io.iov_len != sizeof(i386_regs)) { 1763 /* x86-64 or x32 ABI */ 1764 tcp->u_arg[0] = x86_64_regs.rdi; 1765 tcp->u_arg[1] = x86_64_regs.rsi; 1766 tcp->u_arg[2] = x86_64_regs.rdx; 1767 tcp->u_arg[3] = x86_64_regs.r10; 1768 tcp->u_arg[4] = x86_64_regs.r8; 1769 tcp->u_arg[5] = x86_64_regs.r9; 1770# ifdef X32 1771 tcp->ext_arg[0] = x86_64_regs.rdi; 1772 tcp->ext_arg[1] = x86_64_regs.rsi; 1773 tcp->ext_arg[2] = x86_64_regs.rdx; 1774 tcp->ext_arg[3] = x86_64_regs.r10; 1775 tcp->ext_arg[4] = x86_64_regs.r8; 1776 tcp->ext_arg[5] = x86_64_regs.r9; 1777# endif 1778 } else { 1779 /* i386 ABI */ 1780 /* Zero-extend from 32 bits */ 1781 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1782 * if you need to use *sign-extended* parameter. 1783 */ 1784 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1785 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1786 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1787 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1788 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1789 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1790 } 1791#elif defined(MICROBLAZE) 1792 for (i = 0; i < nargs; ++i) 1793 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1794 return -1; 1795#elif defined(CRISV10) || defined(CRISV32) 1796 static const int crisregs[MAX_ARGS] = { 1797 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1798 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1799 }; 1800 1801 for (i = 0; i < nargs; ++i) 1802 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1803 return -1; 1804#elif defined(TILE) 1805 for (i = 0; i < nargs; ++i) 1806 tcp->u_arg[i] = tile_regs.regs[i]; 1807#elif defined(M68K) 1808 for (i = 0; i < nargs; ++i) 1809 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1810 return -1; 1811#elif defined(OR1K) 1812 (void)nargs; 1813 for (i = 0; i < 6; ++i) 1814 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1815#elif defined(METAG) 1816 for (i = 0; i < nargs; i++) 1817 /* arguments go backwards from D1Ar1 (D1.3) */ 1818 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1819#elif defined(XTENSA) 1820 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1821 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1822 for (i = 0; i < nargs; ++i) 1823 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1824 return -1; 1825# elif defined(ARC) 1826 long *arc_args = &arc_regs.scratch.r0; 1827 for (i = 0; i < nargs; ++i) 1828 tcp->u_arg[i] = *arc_args--; 1829 1830#else /* Other architecture (32bits specific) */ 1831 for (i = 0; i < nargs; ++i) 1832 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 1833 return -1; 1834#endif 1835 return 1; 1836} 1837 1838static int 1839trace_syscall_entering(struct tcb *tcp) 1840{ 1841 int res, scno_good; 1842 1843 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 1844 if (res == 0) 1845 return res; 1846 if (res == 1) 1847 res = get_syscall_args(tcp); 1848 1849 if (res != 1) { 1850 printleader(tcp); 1851 if (scno_good != 1) 1852 tprints("????" /* anti-trigraph gap */ "("); 1853 else if (tcp->qual_flg & UNDEFINED_SCNO) 1854 tprintf("%s(", undefined_scno_name(tcp)); 1855 else 1856 tprintf("%s(", tcp->s_ent->sys_name); 1857 /* 1858 * " <unavailable>" will be added later by the code which 1859 * detects ptrace errors. 1860 */ 1861 goto ret; 1862 } 1863 1864 if ( sys_execve == tcp->s_ent->sys_func 1865# if defined(SPARC) || defined(SPARC64) 1866 || sys_execv == tcp->s_ent->sys_func 1867# endif 1868 ) { 1869 hide_log_until_execve = 0; 1870 } 1871 1872#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 1873 while (1) { 1874# ifdef SYS_socket_subcall 1875 if (tcp->s_ent->sys_func == sys_socketcall) { 1876 decode_socket_subcall(tcp); 1877 break; 1878 } 1879# endif 1880# ifdef SYS_ipc_subcall 1881 if (tcp->s_ent->sys_func == sys_ipc) { 1882 decode_ipc_subcall(tcp); 1883 break; 1884 } 1885# endif 1886 break; 1887 } 1888#endif 1889 1890 if (!(tcp->qual_flg & QUAL_TRACE) 1891 || (tracing_paths && !pathtrace_match(tcp)) 1892 ) { 1893 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 1894 return 0; 1895 } 1896 1897 tcp->flags &= ~TCB_FILTERED; 1898 1899 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 1900 res = 0; 1901 goto ret; 1902 } 1903 1904#ifdef USE_LIBUNWIND 1905 if (stack_trace_enabled) { 1906 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER) 1907 unwind_capture_stacktrace(tcp); 1908 } 1909#endif 1910 1911 printleader(tcp); 1912 if (tcp->qual_flg & UNDEFINED_SCNO) 1913 tprintf("%s(", undefined_scno_name(tcp)); 1914 else 1915 tprintf("%s(", tcp->s_ent->sys_name); 1916 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 1917 res = printargs(tcp); 1918 else 1919 res = tcp->s_ent->sys_func(tcp); 1920 1921 fflush(tcp->outf); 1922 ret: 1923 tcp->flags |= TCB_INSYSCALL; 1924 /* Measure the entrance time as late as possible to avoid errors. */ 1925 if (Tflag || cflag) 1926 gettimeofday(&tcp->etime, NULL); 1927 return res; 1928} 1929 1930/* Returns: 1931 * 1: ok, continue in trace_syscall_exiting(). 1932 * -1: error, trace_syscall_exiting() should print error indicator 1933 * ("????" etc) and bail out. 1934 */ 1935static int 1936get_syscall_result(struct tcb *tcp) 1937{ 1938#if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS 1939 /* already done by get_regs */ 1940#elif defined(S390) || defined(S390X) 1941 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1942 return -1; 1943#elif defined(BFIN) 1944 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 1945 return -1; 1946#elif defined(IA64) 1947# define IA64_PSR_IS ((long)1 << 34) 1948 long psr; 1949 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1950 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1951 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1952 return -1; 1953 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1954 return -1; 1955#elif defined(M68K) 1956 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1957 return -1; 1958#elif defined(ALPHA) 1959 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1960 return -1; 1961 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 1962 return -1; 1963#elif defined(HPPA) 1964 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 1965 return -1; 1966#elif defined(SH) 1967 /* new syscall ABI returns result in R0 */ 1968 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 1969 return -1; 1970#elif defined(SH64) 1971 /* ABI defines result returned in r9 */ 1972 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 1973 return -1; 1974#elif defined(CRISV10) || defined(CRISV32) 1975 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1976 return -1; 1977#elif defined(MICROBLAZE) 1978 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1979 return -1; 1980#elif defined(XTENSA) 1981 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 1982 return -1; 1983#else 1984# error get_syscall_result is not implemented for this architecture 1985#endif 1986 return 1; 1987} 1988 1989/* Returns: 1990 * 1: ok, continue in trace_syscall_exiting(). 1991 * -1: error, trace_syscall_exiting() should print error indicator 1992 * ("????" etc) and bail out. 1993 */ 1994static void 1995get_error(struct tcb *tcp) 1996{ 1997 int u_error = 0; 1998 int check_errno = 1; 1999 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 2000 check_errno = 0; 2001 } 2002#if defined(S390) || defined(S390X) 2003 if (check_errno && is_negated_errno(s390_gpr2)) { 2004 tcp->u_rval = -1; 2005 u_error = -s390_gpr2; 2006 } 2007 else { 2008 tcp->u_rval = s390_gpr2; 2009 } 2010#elif defined(I386) 2011 if (check_errno && is_negated_errno(i386_regs.eax)) { 2012 tcp->u_rval = -1; 2013 u_error = -i386_regs.eax; 2014 } 2015 else { 2016 tcp->u_rval = i386_regs.eax; 2017 } 2018#elif defined(X86_64) || defined(X32) 2019 /* 2020 * In X32, return value is 64-bit (llseek uses one). 2021 * Using merely "long rax" would not work. 2022 */ 2023 kernel_long_t rax; 2024 2025 if (x86_io.iov_len == sizeof(i386_regs)) { 2026 /* Sign extend from 32 bits */ 2027 rax = (int32_t) i386_regs.eax; 2028 } else { 2029 rax = x86_64_regs.rax; 2030 } 2031 if (check_errno && is_negated_errno(rax)) { 2032 tcp->u_rval = -1; 2033 u_error = -rax; 2034 } 2035 else { 2036 tcp->u_rval = rax; 2037# ifdef X32 2038 /* tcp->u_rval contains a truncated value */ 2039 tcp->u_lrval = rax; 2040# endif 2041 } 2042#elif defined(IA64) 2043 if (ia64_ia32mode) { 2044 int err; 2045 2046 err = (int)ia64_r8; 2047 if (check_errno && is_negated_errno(err)) { 2048 tcp->u_rval = -1; 2049 u_error = -err; 2050 } 2051 else { 2052 tcp->u_rval = err; 2053 } 2054 } else { 2055 if (check_errno && ia64_r10) { 2056 tcp->u_rval = -1; 2057 u_error = ia64_r8; 2058 } else { 2059 tcp->u_rval = ia64_r8; 2060 } 2061 } 2062#elif defined(MIPS) 2063 if (check_errno && mips_REG_A3) { 2064 tcp->u_rval = -1; 2065 u_error = mips_REG_V0; 2066 } else { 2067# if defined LINUX_MIPSN32 2068 tcp->u_lrval = mips_REG_V0; 2069# endif 2070 tcp->u_rval = mips_REG_V0; 2071 } 2072#elif defined(POWERPC) 2073 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2074 tcp->u_rval = -1; 2075 u_error = ppc_regs.gpr[3]; 2076 } 2077 else { 2078 tcp->u_rval = ppc_regs.gpr[3]; 2079 } 2080#elif defined(M68K) 2081 if (check_errno && is_negated_errno(m68k_d0)) { 2082 tcp->u_rval = -1; 2083 u_error = -m68k_d0; 2084 } 2085 else { 2086 tcp->u_rval = m68k_d0; 2087 } 2088#elif defined(ARM) || defined(AARCH64) 2089# if defined(AARCH64) 2090 if (tcp->currpers == 1) { 2091 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2092 tcp->u_rval = -1; 2093 u_error = -aarch64_regs.regs[0]; 2094 } 2095 else { 2096 tcp->u_rval = aarch64_regs.regs[0]; 2097 } 2098 } 2099 else 2100# endif 2101 { 2102 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2103 tcp->u_rval = -1; 2104 u_error = -arm_regs.ARM_r0; 2105 } 2106 else { 2107 tcp->u_rval = arm_regs.ARM_r0; 2108 } 2109 } 2110#elif defined(AVR32) 2111 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2112 tcp->u_rval = -1; 2113 u_error = -avr32_regs.r12; 2114 } 2115 else { 2116 tcp->u_rval = avr32_regs.r12; 2117 } 2118#elif defined(BFIN) 2119 if (check_errno && is_negated_errno(bfin_r0)) { 2120 tcp->u_rval = -1; 2121 u_error = -bfin_r0; 2122 } else { 2123 tcp->u_rval = bfin_r0; 2124 } 2125#elif defined(ALPHA) 2126 if (check_errno && alpha_a3) { 2127 tcp->u_rval = -1; 2128 u_error = alpha_r0; 2129 } 2130 else { 2131 tcp->u_rval = alpha_r0; 2132 } 2133#elif defined(SPARC) 2134 if (check_errno && sparc_regs.psr & PSR_C) { 2135 tcp->u_rval = -1; 2136 u_error = sparc_regs.u_regs[U_REG_O0]; 2137 } 2138 else { 2139 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2140 } 2141#elif defined(SPARC64) 2142 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2143 tcp->u_rval = -1; 2144 u_error = sparc_regs.u_regs[U_REG_O0]; 2145 } 2146 else { 2147 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2148 } 2149#elif defined(HPPA) 2150 if (check_errno && is_negated_errno(hppa_r28)) { 2151 tcp->u_rval = -1; 2152 u_error = -hppa_r28; 2153 } 2154 else { 2155 tcp->u_rval = hppa_r28; 2156 } 2157#elif defined(SH) 2158 if (check_errno && is_negated_errno(sh_r0)) { 2159 tcp->u_rval = -1; 2160 u_error = -sh_r0; 2161 } 2162 else { 2163 tcp->u_rval = sh_r0; 2164 } 2165#elif defined(SH64) 2166 if (check_errno && is_negated_errno(sh64_r9)) { 2167 tcp->u_rval = -1; 2168 u_error = -sh64_r9; 2169 } 2170 else { 2171 tcp->u_rval = sh64_r9; 2172 } 2173#elif defined(METAG) 2174 /* result pointer in D0Re0 (D0.0) */ 2175 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2176 tcp->u_rval = -1; 2177 u_error = -metag_regs.dx[0][0]; 2178 } 2179 else { 2180 tcp->u_rval = metag_regs.dx[0][0]; 2181 } 2182#elif defined(CRISV10) || defined(CRISV32) 2183 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2184 tcp->u_rval = -1; 2185 u_error = -cris_r10; 2186 } 2187 else { 2188 tcp->u_rval = cris_r10; 2189 } 2190#elif defined(TILE) 2191 /* 2192 * The standard tile calling convention returns the value (or negative 2193 * errno) in r0, and zero (or positive errno) in r1. 2194 * Until at least kernel 3.8, however, the r1 value is not reflected 2195 * in ptregs at this point, so we use r0 here. 2196 */ 2197 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2198 tcp->u_rval = -1; 2199 u_error = -tile_regs.regs[0]; 2200 } else { 2201 tcp->u_rval = tile_regs.regs[0]; 2202 } 2203#elif defined(MICROBLAZE) 2204 if (check_errno && is_negated_errno(microblaze_r3)) { 2205 tcp->u_rval = -1; 2206 u_error = -microblaze_r3; 2207 } 2208 else { 2209 tcp->u_rval = microblaze_r3; 2210 } 2211#elif defined(OR1K) 2212 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2213 tcp->u_rval = -1; 2214 u_error = -or1k_regs.gpr[11]; 2215 } 2216 else { 2217 tcp->u_rval = or1k_regs.gpr[11]; 2218 } 2219#elif defined(XTENSA) 2220 if (check_errno && is_negated_errno(xtensa_a2)) { 2221 tcp->u_rval = -1; 2222 u_error = -xtensa_a2; 2223 } 2224 else { 2225 tcp->u_rval = xtensa_a2; 2226 } 2227#elif defined(ARC) 2228 if (check_errno && is_negated_errno(arc_regs.scratch.r0)) { 2229 tcp->u_rval = -1; 2230 u_error = -arc_regs.scratch.r0; 2231 } 2232 else { 2233 tcp->u_rval = arc_regs.scratch.r0; 2234 } 2235#endif 2236 tcp->u_error = u_error; 2237} 2238 2239static void 2240dumpio(struct tcb *tcp) 2241{ 2242 int (*func)(); 2243 2244 if (syserror(tcp)) 2245 return; 2246 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2247 return; 2248 func = tcp->s_ent->sys_func; 2249 if (func == printargs) 2250 return; 2251 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2252 if (func == sys_read || 2253 func == sys_pread || 2254 func == sys_recv || 2255 func == sys_recvfrom) { 2256 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2257 return; 2258 } else if (func == sys_readv) { 2259 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2260 return; 2261#if HAVE_SENDMSG 2262 } else if (func == sys_recvmsg) { 2263 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2264 return; 2265 } else if (func == sys_recvmmsg) { 2266 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2267 return; 2268#endif 2269 } 2270 } 2271 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2272 if (func == sys_write || 2273 func == sys_pwrite || 2274 func == sys_send || 2275 func == sys_sendto) 2276 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2277 else if (func == sys_writev) 2278 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2279#if HAVE_SENDMSG 2280 else if (func == sys_sendmsg) 2281 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2282 else if (func == sys_sendmmsg) 2283 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2284#endif 2285 } 2286} 2287 2288static int 2289trace_syscall_exiting(struct tcb *tcp) 2290{ 2291 int sys_res; 2292 struct timeval tv; 2293 int res; 2294 long u_error; 2295 2296 /* Measure the exit time as early as possible to avoid errors. */ 2297 if (Tflag || cflag) 2298 gettimeofday(&tv, NULL); 2299 2300#ifdef USE_LIBUNWIND 2301 if (stack_trace_enabled) { 2302 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE) 2303 unwind_cache_invalidate(tcp); 2304 } 2305#endif 2306 2307#if SUPPORTED_PERSONALITIES > 1 2308 update_personality(tcp, tcp->currpers); 2309#endif 2310 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2311 if (res == 1) { 2312 get_error(tcp); /* never fails */ 2313 if (filtered(tcp) || hide_log_until_execve) 2314 goto ret; 2315 } 2316 2317 if (cflag) { 2318 count_syscall(tcp, &tv); 2319 if (cflag == CFLAG_ONLY_STATS) { 2320 goto ret; 2321 } 2322 } 2323 2324 /* If not in -ff mode, and printing_tcp != tcp, 2325 * then the log currently does not end with output 2326 * of _our syscall entry_, but with something else. 2327 * We need to say which syscall's return is this. 2328 * 2329 * Forced reprinting via TCB_REPRINT is used only by 2330 * "strace -ff -oLOG test/threaded_execve" corner case. 2331 * It's the only case when -ff mode needs reprinting. 2332 */ 2333 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2334 tcp->flags &= ~TCB_REPRINT; 2335 printleader(tcp); 2336 if (tcp->qual_flg & UNDEFINED_SCNO) 2337 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2338 else 2339 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2340 } 2341 printing_tcp = tcp; 2342 2343 if (res != 1) { 2344 /* There was error in one of prior ptrace ops */ 2345 tprints(") "); 2346 tabto(); 2347 tprints("= ? <unavailable>\n"); 2348 line_ended(); 2349 tcp->flags &= ~TCB_INSYSCALL; 2350 return res; 2351 } 2352 2353 sys_res = 0; 2354 if (tcp->qual_flg & QUAL_RAW) { 2355 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2356 } else { 2357 /* FIXME: not_failing_only (IOW, option -z) is broken: 2358 * failure of syscall is known only after syscall return. 2359 * Thus we end up with something like this on, say, ENOENT: 2360 * open("doesnt_exist", O_RDONLY <unfinished ...> 2361 * {next syscall decode} 2362 * whereas the intended result is that open(...) line 2363 * is not shown at all. 2364 */ 2365 if (not_failing_only && tcp->u_error) 2366 goto ret; /* ignore failed syscalls */ 2367 sys_res = tcp->s_ent->sys_func(tcp); 2368 } 2369 2370 tprints(") "); 2371 tabto(); 2372 u_error = tcp->u_error; 2373 if (tcp->qual_flg & QUAL_RAW) { 2374 if (u_error) 2375 tprintf("= -1 (errno %ld)", u_error); 2376 else 2377 tprintf("= %#lx", tcp->u_rval); 2378 } 2379 else if (!(sys_res & RVAL_NONE) && u_error) { 2380 switch (u_error) { 2381 /* Blocked signals do not interrupt any syscalls. 2382 * In this case syscalls don't return ERESTARTfoo codes. 2383 * 2384 * Deadly signals set to SIG_DFL interrupt syscalls 2385 * and kill the process regardless of which of the codes below 2386 * is returned by the interrupted syscall. 2387 * In some cases, kernel forces a kernel-generated deadly 2388 * signal to be unblocked and set to SIG_DFL (and thus cause 2389 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2390 * or SIGILL. (The alternative is to leave process spinning 2391 * forever on the faulty instruction - not useful). 2392 * 2393 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2394 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2395 * but kernel will always restart them. 2396 */ 2397 case ERESTARTSYS: 2398 /* Most common type of signal-interrupted syscall exit code. 2399 * The system call will be restarted with the same arguments 2400 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2401 */ 2402 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2403 break; 2404 case ERESTARTNOINTR: 2405 /* Rare. For example, fork() returns this if interrupted. 2406 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2407 */ 2408 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2409 break; 2410 case ERESTARTNOHAND: 2411 /* pause(), rt_sigsuspend() etc use this code. 2412 * SA_RESTART is ignored (assumed not set): 2413 * syscall won't restart (will return EINTR instead) 2414 * even after signal with SA_RESTART set. However, 2415 * after SIG_IGN or SIG_DFL signal it will restart 2416 * (thus the name "restart only if has no handler"). 2417 */ 2418 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2419 break; 2420 case ERESTART_RESTARTBLOCK: 2421 /* Syscalls like nanosleep(), poll() which can't be 2422 * restarted with their original arguments use this 2423 * code. Kernel will execute restart_syscall() instead, 2424 * which changes arguments before restarting syscall. 2425 * SA_RESTART is ignored (assumed not set) similarly 2426 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2427 * since restart data is saved in "restart block" 2428 * in task struct, and if signal handler uses a syscall 2429 * which in turn saves another such restart block, 2430 * old data is lost and restart becomes impossible) 2431 */ 2432 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2433 break; 2434 default: 2435 if ((unsigned long) u_error < nerrnos 2436 && errnoent[u_error]) 2437 tprintf("= -1 %s (%s)", errnoent[u_error], 2438 strerror(u_error)); 2439 else 2440 tprintf("= -1 ERRNO_%lu (%s)", u_error, 2441 strerror(u_error)); 2442 break; 2443 } 2444 if ((sys_res & RVAL_STR) && tcp->auxstr) 2445 tprintf(" (%s)", tcp->auxstr); 2446 } 2447 else { 2448 if (sys_res & RVAL_NONE) 2449 tprints("= ?"); 2450 else { 2451 switch (sys_res & RVAL_MASK) { 2452 case RVAL_HEX: 2453 tprintf("= %#lx", tcp->u_rval); 2454 break; 2455 case RVAL_OCTAL: 2456 tprintf("= %#lo", tcp->u_rval); 2457 break; 2458 case RVAL_UDECIMAL: 2459 tprintf("= %lu", tcp->u_rval); 2460 break; 2461 case RVAL_DECIMAL: 2462 tprintf("= %ld", tcp->u_rval); 2463 break; 2464 case RVAL_FD: 2465 if (show_fd_path) { 2466 tprints("= "); 2467 printfd(tcp, tcp->u_rval); 2468 } 2469 else 2470 tprintf("= %ld", tcp->u_rval); 2471 break; 2472#if defined(LINUX_MIPSN32) || defined(X32) 2473 /* 2474 case RVAL_LHEX: 2475 tprintf("= %#llx", tcp->u_lrval); 2476 break; 2477 case RVAL_LOCTAL: 2478 tprintf("= %#llo", tcp->u_lrval); 2479 break; 2480 */ 2481 case RVAL_LUDECIMAL: 2482 tprintf("= %llu", tcp->u_lrval); 2483 break; 2484 /* 2485 case RVAL_LDECIMAL: 2486 tprintf("= %lld", tcp->u_lrval); 2487 break; 2488 */ 2489#endif 2490 default: 2491 fprintf(stderr, 2492 "invalid rval format\n"); 2493 break; 2494 } 2495 } 2496 if ((sys_res & RVAL_STR) && tcp->auxstr) 2497 tprintf(" (%s)", tcp->auxstr); 2498 } 2499 if (Tflag) { 2500 tv_sub(&tv, &tv, &tcp->etime); 2501 tprintf(" <%ld.%06ld>", 2502 (long) tv.tv_sec, (long) tv.tv_usec); 2503 } 2504 tprints("\n"); 2505 dumpio(tcp); 2506 line_ended(); 2507 2508#ifdef USE_LIBUNWIND 2509 if (stack_trace_enabled) 2510 unwind_print_stacktrace(tcp); 2511#endif 2512 2513 ret: 2514 tcp->flags &= ~TCB_INSYSCALL; 2515 return 0; 2516} 2517 2518int 2519trace_syscall(struct tcb *tcp) 2520{ 2521 return exiting(tcp) ? 2522 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2523} 2524