syscall.c revision b2d9ff29d038525e684d1cae571d398dc1a24ee7
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 "ptrace.h" 41 42#if defined(SPARC64) 43# undef PTRACE_GETREGS 44# define PTRACE_GETREGS PTRACE_GETREGS64 45# undef PTRACE_SETREGS 46# define PTRACE_SETREGS PTRACE_SETREGS64 47#endif 48 49#include "regs.h" 50 51#if defined SPARC64 52# include <asm/psrcompat.h> 53#elif defined SPARC 54# include <asm/psr.h> 55#endif 56 57#ifndef NT_PRSTATUS 58# define NT_PRSTATUS 1 59#endif 60 61#ifndef NSIG 62# warning: NSIG is not defined, using 32 63# define NSIG 32 64#endif 65 66#include "syscall.h" 67 68/* Define these shorthand notations to simplify the syscallent files. */ 69#define TD TRACE_DESC 70#define TF TRACE_FILE 71#define TI TRACE_IPC 72#define TN TRACE_NETWORK 73#define TP TRACE_PROCESS 74#define TS TRACE_SIGNAL 75#define TM TRACE_MEMORY 76#define NF SYSCALL_NEVER_FAILS 77#define MA MAX_ARGS 78#define SI STACKTRACE_INVALIDATE_CACHE 79#define SE STACKTRACE_CAPTURE_ON_ENTER 80 81const struct_sysent sysent0[] = { 82#include "syscallent.h" 83}; 84 85#if SUPPORTED_PERSONALITIES > 1 86static const struct_sysent sysent1[] = { 87# include "syscallent1.h" 88}; 89#endif 90 91#if SUPPORTED_PERSONALITIES > 2 92static const struct_sysent sysent2[] = { 93# include "syscallent2.h" 94}; 95#endif 96 97/* Now undef them since short defines cause wicked namespace pollution. */ 98#undef TD 99#undef TF 100#undef TI 101#undef TN 102#undef TP 103#undef TS 104#undef TM 105#undef NF 106#undef MA 107#undef SI 108#undef SE 109 110/* 111 * `ioctlent[012].h' files are automatically generated by the auxiliary 112 * program `ioctlsort', such that the list is sorted by the `code' field. 113 * This has the side-effect of resolving the _IO.. macros into 114 * plain integers, eliminating the need to include here everything 115 * in "/usr/include". 116 */ 117 118const char *const errnoent0[] = { 119#include "errnoent.h" 120}; 121const char *const signalent0[] = { 122#include "signalent.h" 123}; 124const struct_ioctlent ioctlent0[] = { 125#include "ioctlent0.h" 126}; 127 128#if SUPPORTED_PERSONALITIES > 1 129static const char *const errnoent1[] = { 130# include "errnoent1.h" 131}; 132static const char *const signalent1[] = { 133# include "signalent1.h" 134}; 135static const struct_ioctlent ioctlent1[] = { 136# include "ioctlent1.h" 137}; 138#endif 139 140#if SUPPORTED_PERSONALITIES > 2 141static const char *const errnoent2[] = { 142# include "errnoent2.h" 143}; 144static const char *const signalent2[] = { 145# include "signalent2.h" 146}; 147static const struct_ioctlent ioctlent2[] = { 148# include "ioctlent2.h" 149}; 150#endif 151 152enum { 153 nsyscalls0 = ARRAY_SIZE(sysent0) 154#if SUPPORTED_PERSONALITIES > 1 155 , nsyscalls1 = ARRAY_SIZE(sysent1) 156# if SUPPORTED_PERSONALITIES > 2 157 , nsyscalls2 = ARRAY_SIZE(sysent2) 158# endif 159#endif 160}; 161 162enum { 163 nerrnos0 = ARRAY_SIZE(errnoent0) 164#if SUPPORTED_PERSONALITIES > 1 165 , nerrnos1 = ARRAY_SIZE(errnoent1) 166# if SUPPORTED_PERSONALITIES > 2 167 , nerrnos2 = ARRAY_SIZE(errnoent2) 168# endif 169#endif 170}; 171 172enum { 173 nsignals0 = ARRAY_SIZE(signalent0) 174#if SUPPORTED_PERSONALITIES > 1 175 , nsignals1 = ARRAY_SIZE(signalent1) 176# if SUPPORTED_PERSONALITIES > 2 177 , nsignals2 = ARRAY_SIZE(signalent2) 178# endif 179#endif 180}; 181 182enum { 183 nioctlents0 = ARRAY_SIZE(ioctlent0) 184#if SUPPORTED_PERSONALITIES > 1 185 , nioctlents1 = ARRAY_SIZE(ioctlent1) 186# if SUPPORTED_PERSONALITIES > 2 187 , nioctlents2 = ARRAY_SIZE(ioctlent2) 188# endif 189#endif 190}; 191 192#if SUPPORTED_PERSONALITIES > 1 193const struct_sysent *sysent = sysent0; 194const char *const *errnoent = errnoent0; 195const char *const *signalent = signalent0; 196const struct_ioctlent *ioctlent = ioctlent0; 197#endif 198unsigned nsyscalls = nsyscalls0; 199unsigned nerrnos = nerrnos0; 200unsigned nsignals = nsignals0; 201unsigned nioctlents = nioctlents0; 202 203unsigned num_quals; 204qualbits_t *qual_vec[SUPPORTED_PERSONALITIES]; 205 206static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = { 207 nsyscalls0, 208#if SUPPORTED_PERSONALITIES > 1 209 nsyscalls1, 210#endif 211#if SUPPORTED_PERSONALITIES > 2 212 nsyscalls2, 213#endif 214}; 215static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = { 216 sysent0, 217#if SUPPORTED_PERSONALITIES > 1 218 sysent1, 219#endif 220#if SUPPORTED_PERSONALITIES > 2 221 sysent2, 222#endif 223}; 224 225enum { 226 MAX_NSYSCALLS1 = (nsyscalls0 227#if SUPPORTED_PERSONALITIES > 1 228 > nsyscalls1 ? nsyscalls0 : nsyscalls1 229#endif 230 ), 231 MAX_NSYSCALLS2 = (MAX_NSYSCALLS1 232#if SUPPORTED_PERSONALITIES > 2 233 > nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2 234#endif 235 ), 236 MAX_NSYSCALLS = MAX_NSYSCALLS2, 237 /* We are ready for arches with up to 255 signals, 238 * even though the largest known signo is on MIPS and it is 128. 239 * The number of existing syscalls on all arches is 240 * larger that 255 anyway, so it is just a pedantic matter. 241 */ 242 MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255 243}; 244 245#if SUPPORTED_PERSONALITIES > 1 246unsigned current_personality; 247 248# ifndef current_wordsize 249unsigned current_wordsize; 250static const int personality_wordsize[SUPPORTED_PERSONALITIES] = { 251 PERSONALITY0_WORDSIZE, 252 PERSONALITY1_WORDSIZE, 253# if SUPPORTED_PERSONALITIES > 2 254 PERSONALITY2_WORDSIZE, 255# endif 256}; 257# endif 258 259void 260set_personality(int personality) 261{ 262 nsyscalls = nsyscall_vec[personality]; 263 sysent = sysent_vec[personality]; 264 265 switch (personality) { 266 case 0: 267 errnoent = errnoent0; 268 nerrnos = nerrnos0; 269 ioctlent = ioctlent0; 270 nioctlents = nioctlents0; 271 signalent = signalent0; 272 nsignals = nsignals0; 273 break; 274 275 case 1: 276 errnoent = errnoent1; 277 nerrnos = nerrnos1; 278 ioctlent = ioctlent1; 279 nioctlents = nioctlents1; 280 signalent = signalent1; 281 nsignals = nsignals1; 282 break; 283 284# if SUPPORTED_PERSONALITIES > 2 285 case 2: 286 errnoent = errnoent2; 287 nerrnos = nerrnos2; 288 ioctlent = ioctlent2; 289 nioctlents = nioctlents2; 290 signalent = signalent2; 291 nsignals = nsignals2; 292 break; 293# endif 294 } 295 296 current_personality = personality; 297# ifndef current_wordsize 298 current_wordsize = personality_wordsize[personality]; 299# endif 300} 301 302static void 303update_personality(struct tcb *tcp, unsigned int personality) 304{ 305 if (personality == current_personality) 306 return; 307 set_personality(personality); 308 309 if (personality == tcp->currpers) 310 return; 311 tcp->currpers = personality; 312 313# if defined(POWERPC64) 314 if (!qflag) { 315 static const char *const names[] = {"64 bit", "32 bit"}; 316 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 317 tcp->pid, names[personality]); 318 } 319# elif defined(X86_64) 320 if (!qflag) { 321 static const char *const names[] = {"64 bit", "32 bit", "x32"}; 322 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 323 tcp->pid, names[personality]); 324 } 325# elif defined(X32) 326 if (!qflag) { 327 static const char *const names[] = {"x32", "32 bit"}; 328 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 329 tcp->pid, names[personality]); 330 } 331# elif defined(AARCH64) 332 if (!qflag) { 333 static const char *const names[] = {"32-bit", "AArch64"}; 334 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 335 tcp->pid, names[personality]); 336 } 337# elif defined(TILE) 338 if (!qflag) { 339 static const char *const names[] = {"64-bit", "32-bit"}; 340 fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n", 341 tcp->pid, names[personality]); 342 } 343# endif 344} 345#endif 346 347static int qual_syscall(), qual_signal(), qual_desc(); 348 349static const struct qual_options { 350 unsigned int bitflag; 351 const char *option_name; 352 int (*qualify)(const char *, int, int); 353 const char *argument_name; 354} qual_options[] = { 355 { QUAL_TRACE, "trace", qual_syscall, "system call" }, 356 { QUAL_TRACE, "t", qual_syscall, "system call" }, 357 { QUAL_ABBREV, "abbrev", qual_syscall, "system call" }, 358 { QUAL_ABBREV, "a", qual_syscall, "system call" }, 359 { QUAL_VERBOSE, "verbose", qual_syscall, "system call" }, 360 { QUAL_VERBOSE, "v", qual_syscall, "system call" }, 361 { QUAL_RAW, "raw", qual_syscall, "system call" }, 362 { QUAL_RAW, "x", qual_syscall, "system call" }, 363 { QUAL_SIGNAL, "signal", qual_signal, "signal" }, 364 { QUAL_SIGNAL, "signals", qual_signal, "signal" }, 365 { QUAL_SIGNAL, "s", qual_signal, "signal" }, 366 { QUAL_READ, "read", qual_desc, "descriptor" }, 367 { QUAL_READ, "reads", qual_desc, "descriptor" }, 368 { QUAL_READ, "r", qual_desc, "descriptor" }, 369 { QUAL_WRITE, "write", qual_desc, "descriptor" }, 370 { QUAL_WRITE, "writes", qual_desc, "descriptor" }, 371 { QUAL_WRITE, "w", qual_desc, "descriptor" }, 372 { 0, NULL, NULL, NULL }, 373}; 374 375static void 376reallocate_qual(const unsigned int n) 377{ 378 unsigned p; 379 qualbits_t *qp; 380 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 381 qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t)); 382 if (!qp) 383 die_out_of_memory(); 384 memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t)); 385 } 386 num_quals = n; 387} 388 389static void 390qualify_one(const unsigned int n, unsigned int bitflag, const int not, const int pers) 391{ 392 int p; 393 394 if (num_quals <= n) 395 reallocate_qual(n + 1); 396 397 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 398 if (pers == p || pers < 0) { 399 if (not) 400 qual_vec[p][n] &= ~bitflag; 401 else 402 qual_vec[p][n] |= bitflag; 403 } 404 } 405} 406 407static int 408qual_syscall(const char *s, const unsigned int bitflag, const int not) 409{ 410 int p; 411 unsigned int i; 412 int rc = -1; 413 414 if (*s >= '0' && *s <= '9') { 415 i = string_to_uint(s); 416 if (i >= MAX_NSYSCALLS) 417 return -1; 418 qualify_one(i, bitflag, not, -1); 419 return 0; 420 } 421 422 for (p = 0; p < SUPPORTED_PERSONALITIES; p++) { 423 for (i = 0; i < nsyscall_vec[p]; i++) { 424 if (sysent_vec[p][i].sys_name 425 && strcmp(s, sysent_vec[p][i].sys_name) == 0 426 ) { 427 qualify_one(i, bitflag, not, p); 428 rc = 0; 429 } 430 } 431 } 432 433 return rc; 434} 435 436static int 437qual_signal(const char *s, const unsigned int bitflag, const int not) 438{ 439 unsigned int i; 440 441 if (*s >= '0' && *s <= '9') { 442 int signo = string_to_uint(s); 443 if (signo < 0 || signo > 255) 444 return -1; 445 qualify_one(signo, bitflag, not, -1); 446 return 0; 447 } 448 if (strncasecmp(s, "SIG", 3) == 0) 449 s += 3; 450 for (i = 0; i <= NSIG; i++) { 451 if (strcasecmp(s, signame(i) + 3) == 0) { 452 qualify_one(i, bitflag, not, -1); 453 return 0; 454 } 455 } 456 return -1; 457} 458 459static int 460qual_desc(const char *s, const unsigned int bitflag, const int not) 461{ 462 if (*s >= '0' && *s <= '9') { 463 int desc = string_to_uint(s); 464 if (desc < 0 || desc > 0x7fff) /* paranoia */ 465 return -1; 466 qualify_one(desc, bitflag, not, -1); 467 return 0; 468 } 469 return -1; 470} 471 472static int 473lookup_class(const char *s) 474{ 475 if (strcmp(s, "file") == 0) 476 return TRACE_FILE; 477 if (strcmp(s, "ipc") == 0) 478 return TRACE_IPC; 479 if (strcmp(s, "network") == 0) 480 return TRACE_NETWORK; 481 if (strcmp(s, "process") == 0) 482 return TRACE_PROCESS; 483 if (strcmp(s, "signal") == 0) 484 return TRACE_SIGNAL; 485 if (strcmp(s, "desc") == 0) 486 return TRACE_DESC; 487 if (strcmp(s, "memory") == 0) 488 return TRACE_MEMORY; 489 return -1; 490} 491 492void 493qualify(const char *s) 494{ 495 const struct qual_options *opt; 496 char *copy; 497 const char *p; 498 int not; 499 unsigned int i; 500 501 if (num_quals == 0) 502 reallocate_qual(MIN_QUALS); 503 504 opt = &qual_options[0]; 505 for (i = 0; (p = qual_options[i].option_name); i++) { 506 unsigned int len = strlen(p); 507 if (strncmp(s, p, len) == 0 && s[len] == '=') { 508 opt = &qual_options[i]; 509 s += len + 1; 510 break; 511 } 512 } 513 not = 0; 514 if (*s == '!') { 515 not = 1; 516 s++; 517 } 518 if (strcmp(s, "none") == 0) { 519 not = 1 - not; 520 s = "all"; 521 } 522 if (strcmp(s, "all") == 0) { 523 for (i = 0; i < num_quals; i++) { 524 qualify_one(i, opt->bitflag, not, -1); 525 } 526 return; 527 } 528 for (i = 0; i < num_quals; i++) { 529 qualify_one(i, opt->bitflag, !not, -1); 530 } 531 copy = strdup(s); 532 if (!copy) 533 die_out_of_memory(); 534 for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) { 535 int n; 536 if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) { 537 unsigned pers; 538 for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) { 539 for (i = 0; i < nsyscall_vec[pers]; i++) 540 if (sysent_vec[pers][i].sys_flags & n) 541 qualify_one(i, opt->bitflag, not, pers); 542 } 543 continue; 544 } 545 if (opt->qualify(p, opt->bitflag, not)) { 546 error_msg_and_die("invalid %s '%s'", 547 opt->argument_name, p); 548 } 549 } 550 free(copy); 551 return; 552} 553 554#ifdef SYS_socket_subcall 555static void 556decode_socket_subcall(struct tcb *tcp) 557{ 558 unsigned long addr; 559 unsigned int i, n, size; 560 561 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls) 562 return; 563 564 tcp->scno = SYS_socket_subcall + tcp->u_arg[0]; 565 tcp->qual_flg = qual_flags[tcp->scno]; 566 tcp->s_ent = &sysent[tcp->scno]; 567 addr = tcp->u_arg[1]; 568 size = current_wordsize; 569 n = tcp->s_ent->nargs; 570 for (i = 0; i < n; ++i) { 571 if (size == sizeof(int)) { 572 unsigned int arg; 573 if (umove(tcp, addr, &arg) < 0) 574 arg = 0; 575 tcp->u_arg[i] = arg; 576 } 577 else { 578 unsigned long arg; 579 if (umove(tcp, addr, &arg) < 0) 580 arg = 0; 581 tcp->u_arg[i] = arg; 582 } 583 addr += size; 584 } 585} 586#endif 587 588#ifdef SYS_ipc_subcall 589static void 590decode_ipc_subcall(struct tcb *tcp) 591{ 592 unsigned int i, n; 593 594 if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls) 595 return; 596 597 tcp->scno = SYS_ipc_subcall + tcp->u_arg[0]; 598 tcp->qual_flg = qual_flags[tcp->scno]; 599 tcp->s_ent = &sysent[tcp->scno]; 600 n = tcp->s_ent->nargs; 601 for (i = 0; i < n; i++) 602 tcp->u_arg[i] = tcp->u_arg[i + 1]; 603} 604#endif 605 606int 607printargs(struct tcb *tcp) 608{ 609 if (entering(tcp)) { 610 int i; 611 int n = tcp->s_ent->nargs; 612 for (i = 0; i < n; i++) 613 tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]); 614 } 615 return 0; 616} 617 618int 619printargs_lu(struct tcb *tcp) 620{ 621 if (entering(tcp)) { 622 int i; 623 int n = tcp->s_ent->nargs; 624 for (i = 0; i < n; i++) 625 tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]); 626 } 627 return 0; 628} 629 630int 631printargs_ld(struct tcb *tcp) 632{ 633 if (entering(tcp)) { 634 int i; 635 int n = tcp->s_ent->nargs; 636 for (i = 0; i < n; i++) 637 tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]); 638 } 639 return 0; 640} 641 642#if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH) 643long 644getrval2(struct tcb *tcp) 645{ 646 long val; 647 648# if defined(SPARC) || defined(SPARC64) 649 val = sparc_regs.u_regs[U_REG_O1]; 650# elif defined(SH) 651 if (upeek(tcp->pid, 4*(REG_REG0+1), &val) < 0) 652 return -1; 653# elif defined(IA64) 654 if (upeek(tcp->pid, PT_R9, &val) < 0) 655 return -1; 656# endif 657 658 return val; 659} 660#endif 661 662#if defined(I386) 663static struct user_regs_struct i386_regs; 664long *const i386_esp_ptr = &i386_regs.esp; 665# define ARCH_REGS_FOR_GETREGS i386_regs 666#elif defined(X86_64) || defined(X32) 667/* 668 * On i386, pt_regs and user_regs_struct are the same, 669 * but on 64 bit x86, user_regs_struct has six more fields: 670 * fs_base, gs_base, ds, es, fs, gs. 671 * PTRACE_GETREGS fills them too, so struct pt_regs would overflow. 672 */ 673struct i386_user_regs_struct { 674 uint32_t ebx; 675 uint32_t ecx; 676 uint32_t edx; 677 uint32_t esi; 678 uint32_t edi; 679 uint32_t ebp; 680 uint32_t eax; 681 uint32_t xds; 682 uint32_t xes; 683 uint32_t xfs; 684 uint32_t xgs; 685 uint32_t orig_eax; 686 uint32_t eip; 687 uint32_t xcs; 688 uint32_t eflags; 689 uint32_t esp; 690 uint32_t xss; 691}; 692static union { 693 struct user_regs_struct x86_64_r; 694 struct i386_user_regs_struct i386_r; 695} x86_regs_union; 696# define x86_64_regs x86_regs_union.x86_64_r 697# define i386_regs x86_regs_union.i386_r 698uint32_t *const i386_esp_ptr = &i386_regs.esp; 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) 705bool ia64_ia32mode = 0; /* not static */ 706static long ia64_r8, ia64_r10; 707#elif defined(POWERPC) 708struct pt_regs ppc_regs; 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) 715struct pt_regs arm_regs; /* not static */ 716# define ARCH_REGS_FOR_GETREGS arm_regs 717#elif defined(AARCH64) 718struct arm_pt_regs { 719 int uregs[18]; 720}; 721# define ARM_cpsr uregs[16] 722# define ARM_pc uregs[15] 723# define ARM_lr uregs[14] 724# define ARM_sp uregs[13] 725# define ARM_ip uregs[12] 726# define ARM_fp uregs[11] 727# define ARM_r10 uregs[10] 728# define ARM_r9 uregs[9] 729# define ARM_r8 uregs[8] 730# define ARM_r7 uregs[7] 731# define ARM_r6 uregs[6] 732# define ARM_r5 uregs[5] 733# define ARM_r4 uregs[4] 734# define ARM_r3 uregs[3] 735# define ARM_r2 uregs[2] 736# define ARM_r1 uregs[1] 737# define ARM_r0 uregs[0] 738# define ARM_ORIG_r0 uregs[17] 739static union { 740 struct user_pt_regs aarch64_r; 741 struct arm_pt_regs arm_r; 742} arm_regs_union; 743# define aarch64_regs arm_regs_union.aarch64_r 744# define arm_regs arm_regs_union.arm_r 745static struct iovec aarch64_io = { 746 .iov_base = &arm_regs_union 747}; 748# define ARCH_REGS_FOR_GETREGSET arm_regs_union 749# define ARCH_IOVEC_FOR_GETREGSET aarch64_io 750#elif defined(ALPHA) 751static long alpha_r0; 752static long alpha_a3; 753#elif defined(AVR32) 754static struct pt_regs avr32_regs; 755# define ARCH_REGS_FOR_GETREGS avr32_regs 756#elif defined(SPARC) || defined(SPARC64) 757struct pt_regs sparc_regs; /* not static */ 758# define ARCH_REGS_FOR_GETREGS sparc_regs 759#elif defined(MIPS) 760struct mips_regs mips_regs; /* not static */ 761/* PTRACE_GETREGS on MIPS is available since linux v2.6.15. */ 762# define ARCH_REGS_FOR_GETREGS mips_regs 763#elif defined(S390) || defined(S390X) 764static long s390_gpr2; 765#elif defined(HPPA) 766static long hppa_r28; 767#elif defined(SH) 768static long sh_r0; 769#elif defined(SH64) 770static long sh64_r9; 771#elif defined(CRISV10) || defined(CRISV32) 772static long cris_r10; 773#elif defined(TILE) 774struct pt_regs tile_regs; 775# define ARCH_REGS_FOR_GETREGS tile_regs 776#elif defined(MICROBLAZE) 777static long microblaze_r3; 778#elif defined(OR1K) 779static struct user_regs_struct or1k_regs; 780# define ARCH_REGS_FOR_GETREGSET or1k_regs 781#elif defined(METAG) 782static struct user_gp_regs metag_regs; 783# define ARCH_REGS_FOR_GETREGSET metag_regs 784#elif defined(XTENSA) 785static long xtensa_a2; 786# elif defined(ARC) 787static struct user_regs_struct arc_regs; 788# define ARCH_REGS_FOR_GETREGSET arc_regs 789#endif 790 791static long get_regs_error; 792 793void 794print_pc(struct tcb *tcp) 795{ 796 const char *fmt; 797 const char *bad; 798 799#ifdef current_wordsize 800# define pc_wordsize current_wordsize 801#else 802# define pc_wordsize personality_wordsize[tcp->currpers] 803#endif 804 805 if (pc_wordsize == 4) { 806 fmt = "[%08lx] "; 807 bad = "[????????] "; 808 } else { 809 fmt = "[%016lx] "; 810 bad = "[????????????????] "; 811 } 812 813#undef pc_wordsize 814#define PRINTBADPC tprints(bad) 815 816 if (get_regs_error) { 817 PRINTBADPC; 818 return; 819 } 820 821#if defined(I386) 822 tprintf(fmt, i386_regs.eip); 823#elif defined(X86_64) || defined(X32) 824 if (x86_io.iov_len == sizeof(i386_regs)) 825 tprintf(fmt, (unsigned long) i386_regs.eip); 826 else 827 tprintf(fmt, (unsigned long) x86_64_regs.rip); 828#elif defined(S390) || defined(S390X) 829 long psw; 830 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) { 831 PRINTBADPC; 832 return; 833 } 834 tprintf(fmt, psw); 835#elif defined(IA64) 836 long ip; 837 if (upeek(tcp->pid, PT_B0, &ip) < 0) { 838 PRINTBADPC; 839 return; 840 } 841 tprintf(fmt, ip); 842#elif defined(POWERPC) 843 tprintf(fmt, ppc_regs.nip); 844#elif defined(M68K) 845 long pc; 846 if (upeek(tcp->pid, 4*PT_PC, &pc) < 0) { 847 PRINTBADPC; 848 return; 849 } 850 tprintf(fmt, pc); 851#elif defined(ALPHA) 852 long pc; 853 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 854 PRINTBADPC; 855 return; 856 } 857 tprintf(fmt, pc); 858#elif defined(SPARC) 859 tprintf(fmt, sparc_regs.pc); 860#elif defined(SPARC64) 861 tprintf(fmt, sparc_regs.tpc); 862#elif defined(HPPA) 863 long pc; 864 if (upeek(tcp->pid, PT_IAOQ0, &pc) < 0) { 865 PRINTBADPC; 866 return; 867 } 868 tprintf(fmt, pc); 869#elif defined MIPS 870 tprintf(fmt, (unsigned long) mips_REG_EPC); 871#elif defined(SH) 872 long pc; 873 if (upeek(tcp->pid, 4*REG_PC, &pc) < 0) { 874 PRINTBADPC; 875 return; 876 } 877 tprintf(fmt, pc); 878#elif defined(SH64) 879 long pc; 880 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 881 PRINTBADPC; 882 return; 883 } 884 tprintf(fmt, pc); 885#elif defined(ARM) 886 tprintf(fmt, arm_regs.ARM_pc); 887#elif defined(AVR32) 888 tprintf(fmt, avr32_regs.pc); 889#elif defined(BFIN) 890 long pc; 891 if (upeek(tcp->pid, PT_PC, &pc) < 0) { 892 PRINTBADPC; 893 return; 894 } 895 tprintf(fmt, pc); 896#elif defined(CRISV10) 897 long pc; 898 if (upeek(tcp->pid, 4*PT_IRP, &pc) < 0) { 899 PRINTBADPC; 900 return; 901 } 902 tprintf(fmt, pc); 903#elif defined(CRISV32) 904 long pc; 905 if (upeek(tcp->pid, 4*PT_ERP, &pc) < 0) { 906 PRINTBADPC; 907 return; 908 } 909 tprintf(fmt, pc); 910#elif defined(TILE) 911 tprintf(fmt, (unsigned long) tile_regs.pc); 912#elif defined(OR1K) 913 tprintf(fmt, or1k_regs.pc); 914#elif defined(METAG) 915 tprintf(fmt, metag_regs.pc); 916#elif defined(XTENSA) 917 long pc; 918 if (upeek(tcp->pid, REG_PC, &pc) < 0) { 919 PRINTBADPC; 920 return; 921 } 922 tprintf(fmt, pc); 923#elif defined(ARC) 924 tprintf(fmt, arc_regs.efa); 925#else 926# warning print_pc is not implemented for this architecture 927 PRINTBADPC; 928#endif /* architecture */ 929} 930 931/* 932 * Shuffle syscall numbers so that we don't have huge gaps in syscall table. 933 * The shuffling should be an involution: shuffle_scno(shuffle_scno(n)) == n. 934 */ 935#if defined(ARM) || defined(AARCH64) /* So far only 32-bit ARM needs this */ 936static long 937shuffle_scno(unsigned long scno) 938{ 939 if (scno < ARM_FIRST_SHUFFLED_SYSCALL) 940 return scno; 941 942 /* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */ 943 if (scno == ARM_FIRST_SHUFFLED_SYSCALL) 944 return 0x000ffff0; 945 if (scno == 0x000ffff0) 946 return ARM_FIRST_SHUFFLED_SYSCALL; 947 948#define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1) 949 /* 950 * Is it ARM specific syscall? 951 * Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range 952 * with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range. 953 */ 954 if (scno >= 0x000f0000 && 955 scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) { 956 return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL; 957 } 958 if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) { 959 return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL; 960 } 961 962 return scno; 963} 964#else 965# define shuffle_scno(scno) ((long)(scno)) 966#endif 967 968static char* 969undefined_scno_name(struct tcb *tcp) 970{ 971 static char buf[sizeof("syscall_%lu") + sizeof(long)*3]; 972 973 sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno)); 974 return buf; 975} 976 977#ifdef POWERPC 978/* 979 * PTRACE_GETREGS was added to the PowerPC kernel in v2.6.23, 980 * we provide a slow fallback for old kernels. 981 */ 982static int powerpc_getregs_old(pid_t pid) 983{ 984 int i; 985 long r; 986 987 if (iflag) { 988 r = upeek(pid, sizeof(long) * PT_NIP, (long *)&ppc_regs.nip); 989 if (r) 990 goto out; 991 } 992#ifdef POWERPC64 /* else we never use it */ 993 r = upeek(pid, sizeof(long) * PT_MSR, (long *)&ppc_regs.msr); 994 if (r) 995 goto out; 996#endif 997 r = upeek(pid, sizeof(long) * PT_CCR, (long *)&ppc_regs.ccr); 998 if (r) 999 goto out; 1000 r = upeek(pid, sizeof(long) * PT_ORIG_R3, (long *)&ppc_regs.orig_gpr3); 1001 if (r) 1002 goto out; 1003 for (i = 0; i <= 8; i++) { 1004 r = upeek(pid, sizeof(long) * (PT_R0 + i), 1005 (long *)&ppc_regs.gpr[i]); 1006 if (r) 1007 goto out; 1008 } 1009 out: 1010 return r; 1011} 1012#endif 1013 1014void 1015clear_regs(void) 1016{ 1017 get_regs_error = -1; 1018} 1019 1020#if defined ARCH_REGS_FOR_GETREGSET 1021static long 1022get_regset(pid_t pid) 1023{ 1024# ifdef ARCH_IOVEC_FOR_GETREGSET 1025 /* variable iovec */ 1026 ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET); 1027 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, 1028 &ARCH_IOVEC_FOR_GETREGSET); 1029# else 1030 /* constant iovec */ 1031 static struct iovec io = { 1032 .iov_base = &ARCH_REGS_FOR_GETREGSET, 1033 .iov_len = sizeof(ARCH_REGS_FOR_GETREGSET) 1034 }; 1035 return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io); 1036 1037# endif 1038} 1039#endif /* ARCH_REGS_FOR_GETREGSET */ 1040 1041void 1042get_regs(pid_t pid) 1043{ 1044#ifdef ARCH_REGS_FOR_GETREGSET 1045# ifdef X86_64 1046 /* Try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS. */ 1047 static int getregset_support; 1048 1049 if (getregset_support >= 0) { 1050 get_regs_error = get_regset(pid); 1051 if (getregset_support > 0) 1052 return; 1053 if (get_regs_error >= 0) { 1054 getregset_support = 1; 1055 return; 1056 } 1057 if (errno == EPERM || errno == ESRCH) 1058 return; 1059 getregset_support = -1; 1060 } 1061 /* Use old method, with unreliable heuristical detection of 32-bitness. */ 1062 x86_io.iov_len = sizeof(x86_64_regs); 1063 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs); 1064 if (!get_regs_error && x86_64_regs.cs == 0x23) { 1065 x86_io.iov_len = sizeof(i386_regs); 1066 /* 1067 * The order is important: i386_regs and x86_64_regs 1068 * are overlaid in memory! 1069 */ 1070 i386_regs.ebx = x86_64_regs.rbx; 1071 i386_regs.ecx = x86_64_regs.rcx; 1072 i386_regs.edx = x86_64_regs.rdx; 1073 i386_regs.esi = x86_64_regs.rsi; 1074 i386_regs.edi = x86_64_regs.rdi; 1075 i386_regs.ebp = x86_64_regs.rbp; 1076 i386_regs.eax = x86_64_regs.rax; 1077 /* i386_regs.xds = x86_64_regs.ds; unused by strace */ 1078 /* i386_regs.xes = x86_64_regs.es; ditto... */ 1079 /* i386_regs.xfs = x86_64_regs.fs; */ 1080 /* i386_regs.xgs = x86_64_regs.gs; */ 1081 i386_regs.orig_eax = x86_64_regs.orig_rax; 1082 i386_regs.eip = x86_64_regs.rip; 1083 /* i386_regs.xcs = x86_64_regs.cs; */ 1084 /* i386_regs.eflags = x86_64_regs.eflags; */ 1085 i386_regs.esp = x86_64_regs.rsp; 1086 /* i386_regs.xss = x86_64_regs.ss; */ 1087 } 1088# else /* !X86_64 */ 1089 /* Assume that PTRACE_GETREGSET works. */ 1090 get_regs_error = get_regset(pid); 1091# endif 1092#elif defined ARCH_REGS_FOR_GETREGS 1093# if defined SPARC || defined SPARC64 1094 /* SPARC systems have the meaning of data and addr reversed */ 1095 get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&ARCH_REGS_FOR_GETREGS, 0); 1096# elif defined POWERPC 1097 static bool old_kernel = 0; 1098 if (old_kernel) 1099 goto old; 1100 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1101 if (get_regs_error && errno == EIO) { 1102 old_kernel = 1; 1103 old: 1104 get_regs_error = powerpc_getregs_old(pid); 1105 } 1106# else 1107 /* Assume that PTRACE_GETREGS works. */ 1108 get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS); 1109# endif 1110 1111#else /* !ARCH_REGS_FOR_GETREGSET && !ARCH_REGS_FOR_GETREGS */ 1112# warning get_regs is not implemented for this architecture yet 1113 get_regs_error = 0; 1114#endif 1115} 1116 1117/* Returns: 1118 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1119 * 1: ok, continue in trace_syscall_entering(). 1120 * other: error, trace_syscall_entering() should print error indicator 1121 * ("????" etc) and bail out. 1122 */ 1123static int 1124get_scno(struct tcb *tcp) 1125{ 1126 long scno = 0; 1127 1128#if defined(S390) || defined(S390X) 1129 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1130 return -1; 1131 1132 if (s390_gpr2 != -ENOSYS) { 1133 /* 1134 * Since kernel version 2.5.44 the scno gets passed in gpr2. 1135 */ 1136 scno = s390_gpr2; 1137 } else { 1138 /* 1139 * Old style of "passing" the scno via the SVC instruction. 1140 */ 1141 long psw; 1142 long opcode, offset_reg, tmp; 1143 void *svc_addr; 1144 static const int gpr_offset[16] = { 1145 PT_GPR0, PT_GPR1, PT_ORIGGPR2, PT_GPR3, 1146 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, 1147 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, 1148 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15 1149 }; 1150 1151 if (upeek(tcp->pid, PT_PSWADDR, &psw) < 0) 1152 return -1; 1153 errno = 0; 1154 opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0); 1155 if (errno) { 1156 perror_msg("peektext(psw-oneword)"); 1157 return -1; 1158 } 1159 1160 /* 1161 * We have to check if the SVC got executed directly or via an 1162 * EXECUTE instruction. In case of EXECUTE it is necessary to do 1163 * instruction decoding to derive the system call number. 1164 * Unfortunately the opcode sizes of EXECUTE and SVC are differently, 1165 * so that this doesn't work if a SVC opcode is part of an EXECUTE 1166 * opcode. Since there is no way to find out the opcode size this 1167 * is the best we can do... 1168 */ 1169 if ((opcode & 0xff00) == 0x0a00) { 1170 /* SVC opcode */ 1171 scno = opcode & 0xff; 1172 } 1173 else { 1174 /* SVC got executed by EXECUTE instruction */ 1175 1176 /* 1177 * Do instruction decoding of EXECUTE. If you really want to 1178 * understand this, read the Principles of Operations. 1179 */ 1180 svc_addr = (void *) (opcode & 0xfff); 1181 1182 tmp = 0; 1183 offset_reg = (opcode & 0x000f0000) >> 16; 1184 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1185 return -1; 1186 svc_addr += tmp; 1187 1188 tmp = 0; 1189 offset_reg = (opcode & 0x0000f000) >> 12; 1190 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1191 return -1; 1192 svc_addr += tmp; 1193 1194 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0); 1195 if (errno) 1196 return -1; 1197# if defined(S390X) 1198 scno >>= 48; 1199# else 1200 scno >>= 16; 1201# endif 1202 tmp = 0; 1203 offset_reg = (opcode & 0x00f00000) >> 20; 1204 if (offset_reg && (upeek(tcp->pid, gpr_offset[offset_reg], &tmp) < 0)) 1205 return -1; 1206 1207 scno = (scno | tmp) & 0xff; 1208 } 1209 } 1210#elif defined(POWERPC) 1211 scno = ppc_regs.gpr[0]; 1212# ifdef POWERPC64 1213 unsigned int currpers; 1214 1215 /* 1216 * Check for 64/32 bit mode. 1217 * Embedded implementations covered by Book E extension of PPC use 1218 * bit 0 (CM) of 32-bit Machine state register (MSR). 1219 * Other implementations use bit 0 (SF) of 64-bit MSR. 1220 */ 1221 currpers = (ppc_regs.msr & 0x8000000080000000) ? 0 : 1; 1222 update_personality(tcp, currpers); 1223# endif 1224#elif defined(AVR32) 1225 scno = avr32_regs.r8; 1226#elif defined(BFIN) 1227 if (upeek(tcp->pid, PT_ORIG_P0, &scno)) 1228 return -1; 1229#elif defined(I386) 1230 scno = i386_regs.orig_eax; 1231#elif defined(X86_64) || defined(X32) 1232# ifndef __X32_SYSCALL_BIT 1233# define __X32_SYSCALL_BIT 0x40000000 1234# endif 1235 unsigned int currpers; 1236# if 1 1237 /* GETREGSET of NT_PRSTATUS tells us regset size, 1238 * which unambiguously detects i386. 1239 * 1240 * Linux kernel distinguishes x86-64 and x32 processes 1241 * solely by looking at __X32_SYSCALL_BIT: 1242 * arch/x86/include/asm/compat.h::is_x32_task(): 1243 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT) 1244 * return true; 1245 */ 1246 if (x86_io.iov_len == sizeof(i386_regs)) { 1247 scno = i386_regs.orig_eax; 1248 currpers = 1; 1249 } else { 1250 scno = x86_64_regs.orig_rax; 1251 currpers = 0; 1252 if (scno & __X32_SYSCALL_BIT) { 1253 /* 1254 * Syscall number -1 requires special treatment: 1255 * it might be a side effect of SECCOMP_RET_ERRNO 1256 * filtering that sets orig_rax to -1 1257 * in some versions of linux kernel. 1258 * If that is the case, then 1259 * __X32_SYSCALL_BIT logic does not apply. 1260 */ 1261 if ((long long) x86_64_regs.orig_rax != -1) { 1262 scno -= __X32_SYSCALL_BIT; 1263 currpers = 2; 1264 } else { 1265# ifdef X32 1266 currpers = 2; 1267# endif 1268 } 1269 } 1270 } 1271# elif 0 1272 /* cs = 0x33 for long mode (native 64 bit and x32) 1273 * cs = 0x23 for compatibility mode (32 bit) 1274 * ds = 0x2b for x32 mode (x86-64 in 32 bit) 1275 */ 1276 scno = x86_64_regs.orig_rax; 1277 switch (x86_64_regs.cs) { 1278 case 0x23: currpers = 1; break; 1279 case 0x33: 1280 if (x86_64_regs.ds == 0x2b) { 1281 currpers = 2; 1282 scno &= ~__X32_SYSCALL_BIT; 1283 } else 1284 currpers = 0; 1285 break; 1286 default: 1287 fprintf(stderr, "Unknown value CS=0x%08X while " 1288 "detecting personality of process " 1289 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid); 1290 currpers = current_personality; 1291 break; 1292 } 1293# elif 0 1294 /* This version analyzes the opcode of a syscall instruction. 1295 * (int 0x80 on i386 vs. syscall on x86-64) 1296 * It works, but is too complicated, and strictly speaking, unreliable. 1297 */ 1298 unsigned long call, rip = x86_64_regs.rip; 1299 /* sizeof(syscall) == sizeof(int 0x80) == 2 */ 1300 rip -= 2; 1301 errno = 0; 1302 call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0); 1303 if (errno) 1304 fprintf(stderr, "ptrace_peektext failed: %s\n", 1305 strerror(errno)); 1306 switch (call & 0xffff) { 1307 /* x86-64: syscall = 0x0f 0x05 */ 1308 case 0x050f: currpers = 0; break; 1309 /* i386: int 0x80 = 0xcd 0x80 */ 1310 case 0x80cd: currpers = 1; break; 1311 default: 1312 currpers = current_personality; 1313 fprintf(stderr, 1314 "Unknown syscall opcode (0x%04X) while " 1315 "detecting personality of process " 1316 "PID=%d\n", (int)call, tcp->pid); 1317 break; 1318 } 1319# endif 1320 1321# ifdef X32 1322 /* If we are built for a x32 system, then personality 0 is x32 1323 * (not x86_64), and stracing of x86_64 apps is not supported. 1324 * Stracing of i386 apps is still supported. 1325 */ 1326 if (currpers == 0) { 1327 fprintf(stderr, "syscall_%lu(...) in unsupported " 1328 "64-bit mode of process PID=%d\n", 1329 scno, tcp->pid); 1330 return 0; 1331 } 1332 currpers &= ~2; /* map 2,1 to 0,1 */ 1333# endif 1334 update_personality(tcp, currpers); 1335#elif defined(IA64) 1336# define IA64_PSR_IS ((long)1 << 34) 1337 long psr; 1338 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1339 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1340 if (ia64_ia32mode) { 1341 if (upeek(tcp->pid, PT_R1, &scno) < 0) 1342 return -1; 1343 } else { 1344 if (upeek(tcp->pid, PT_R15, &scno) < 0) 1345 return -1; 1346 } 1347#elif defined(AARCH64) 1348 switch (aarch64_io.iov_len) { 1349 case sizeof(aarch64_regs): 1350 /* We are in 64-bit mode */ 1351 scno = aarch64_regs.regs[8]; 1352 update_personality(tcp, 1); 1353 break; 1354 case sizeof(arm_regs): 1355 /* We are in 32-bit mode */ 1356 /* Note: we don't support OABI, unlike 32-bit ARM build */ 1357 scno = arm_regs.ARM_r7; 1358 scno = shuffle_scno(scno); 1359 update_personality(tcp, 0); 1360 break; 1361 } 1362#elif defined(ARM) 1363 if (arm_regs.ARM_ip != 0) { 1364 /* It is not a syscall entry */ 1365 fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid); 1366 tcp->flags |= TCB_INSYSCALL; 1367 return 0; 1368 } 1369 /* Note: we support only 32-bit CPUs, not 26-bit */ 1370 1371# if !defined(__ARM_EABI__) || ENABLE_ARM_OABI 1372 if (arm_regs.ARM_cpsr & 0x20) 1373 /* Thumb mode */ 1374 goto scno_in_r7; 1375 /* ARM mode */ 1376 /* Check EABI/OABI by examining SVC insn's low 24 bits */ 1377 errno = 0; 1378 scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); 1379 if (errno) 1380 return -1; 1381 /* EABI syscall convention? */ 1382 if ((unsigned long) scno != 0xef000000) { 1383 /* No, it's OABI */ 1384 if ((scno & 0x0ff00000) != 0x0f900000) { 1385 fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n", 1386 tcp->pid, scno); 1387 return -1; 1388 } 1389 /* Fixup the syscall number */ 1390 scno &= 0x000fffff; 1391 } else { 1392 scno_in_r7: 1393 scno = arm_regs.ARM_r7; 1394 } 1395# else /* __ARM_EABI__ || !ENABLE_ARM_OABI */ 1396 scno = arm_regs.ARM_r7; 1397# endif 1398 scno = shuffle_scno(scno); 1399#elif defined(M68K) 1400 if (upeek(tcp->pid, 4*PT_ORIG_D0, &scno) < 0) 1401 return -1; 1402#elif defined(MIPS) 1403 scno = mips_REG_V0; 1404 1405 if (!SCNO_IN_RANGE(scno)) { 1406 if (mips_REG_A3 == 0 || mips_REG_A3 == -1) { 1407 if (debug_flag) 1408 fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno); 1409 return 0; 1410 } 1411 } 1412#elif defined(ALPHA) 1413 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1414 return -1; 1415 if (upeek(tcp->pid, REG_R0, &scno) < 0) 1416 return -1; 1417 1418 /* 1419 * Do some sanity checks to figure out if it's 1420 * really a syscall entry 1421 */ 1422 if (!SCNO_IN_RANGE(scno)) { 1423 if (alpha_a3 == 0 || alpha_a3 == -1) { 1424 if (debug_flag) 1425 fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno); 1426 return 0; 1427 } 1428 } 1429#elif defined(SPARC) || defined(SPARC64) 1430 /* Disassemble the syscall trap. */ 1431 /* Retrieve the syscall trap instruction. */ 1432 unsigned long trap; 1433 errno = 0; 1434# if defined(SPARC64) 1435 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0); 1436 trap >>= 32; 1437# else 1438 trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0); 1439# endif 1440 if (errno) 1441 return -1; 1442 1443 /* Disassemble the trap to see what personality to use. */ 1444 switch (trap) { 1445 case 0x91d02010: 1446 /* Linux/SPARC syscall trap. */ 1447 update_personality(tcp, 0); 1448 break; 1449 case 0x91d0206d: 1450 /* Linux/SPARC64 syscall trap. */ 1451 update_personality(tcp, 2); 1452 break; 1453 case 0x91d02000: 1454 /* SunOS syscall trap. (pers 1) */ 1455 fprintf(stderr, "syscall: SunOS no support\n"); 1456 return -1; 1457 case 0x91d02008: 1458 /* Solaris 2.x syscall trap. (per 2) */ 1459 update_personality(tcp, 1); 1460 break; 1461 case 0x91d02009: 1462 /* NetBSD/FreeBSD syscall trap. */ 1463 fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n"); 1464 return -1; 1465 case 0x91d02027: 1466 /* Solaris 2.x gettimeofday */ 1467 update_personality(tcp, 1); 1468 break; 1469 default: 1470# if defined(SPARC64) 1471 fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc); 1472# else 1473 fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc); 1474# endif 1475 return -1; 1476 } 1477 1478 /* Extract the system call number from the registers. */ 1479 if (trap == 0x91d02027) 1480 scno = 156; 1481 else 1482 scno = sparc_regs.u_regs[U_REG_G1]; 1483 if (scno == 0) { 1484 scno = sparc_regs.u_regs[U_REG_O0]; 1485 memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0])); 1486 } 1487#elif defined(HPPA) 1488 if (upeek(tcp->pid, PT_GR20, &scno) < 0) 1489 return -1; 1490#elif defined(SH) 1491 /* 1492 * In the new syscall ABI, the system call number is in R3. 1493 */ 1494 if (upeek(tcp->pid, 4*(REG_REG0+3), &scno) < 0) 1495 return -1; 1496 1497 if (scno < 0) { 1498 /* Odd as it may seem, a glibc bug has been known to cause 1499 glibc to issue bogus negative syscall numbers. So for 1500 our purposes, make strace print what it *should* have been */ 1501 long correct_scno = (scno & 0xff); 1502 if (debug_flag) 1503 fprintf(stderr, 1504 "Detected glibc bug: bogus system call" 1505 " number = %ld, correcting to %ld\n", 1506 scno, 1507 correct_scno); 1508 scno = correct_scno; 1509 } 1510#elif defined(SH64) 1511 if (upeek(tcp->pid, REG_SYSCALL, &scno) < 0) 1512 return -1; 1513 scno &= 0xFFFF; 1514#elif defined(CRISV10) || defined(CRISV32) 1515 if (upeek(tcp->pid, 4*PT_R9, &scno) < 0) 1516 return -1; 1517#elif defined(TILE) 1518 unsigned int currpers; 1519 scno = tile_regs.regs[10]; 1520# ifdef __tilepro__ 1521 currpers = 1; 1522# else 1523# ifndef PT_FLAGS_COMPAT 1524# define PT_FLAGS_COMPAT 0x10000 /* from Linux 3.8 on */ 1525# endif 1526 if (tile_regs.flags & PT_FLAGS_COMPAT) 1527 currpers = 1; 1528 else 1529 currpers = 0; 1530# endif 1531 update_personality(tcp, currpers); 1532#elif defined(MICROBLAZE) 1533 if (upeek(tcp->pid, 0, &scno) < 0) 1534 return -1; 1535#elif defined(OR1K) 1536 scno = or1k_regs.gpr[11]; 1537#elif defined(METAG) 1538 scno = metag_regs.dx[0][1]; /* syscall number in D1Re0 (D1.0) */ 1539#elif defined(XTENSA) 1540 if (upeek(tcp->pid, SYSCALL_NR, &scno) < 0) 1541 return -1; 1542# elif defined(ARC) 1543 scno = arc_regs.scratch.r8; 1544#endif 1545 1546 tcp->scno = scno; 1547 if (SCNO_IS_VALID(tcp->scno)) { 1548 tcp->s_ent = &sysent[scno]; 1549 tcp->qual_flg = qual_flags[scno]; 1550 } else { 1551 static const struct_sysent unknown = { 1552 .nargs = MAX_ARGS, 1553 .sys_flags = 0, 1554 .sys_func = printargs, 1555 .sys_name = "unknown", /* not used */ 1556 }; 1557 tcp->s_ent = &unknown; 1558 tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS; 1559 } 1560 return 1; 1561} 1562 1563/* 1564 * Cannot rely on __kernel_[u]long_t being defined, 1565 * it is quite a recent feature of <asm/posix_types.h>. 1566 */ 1567#ifdef __kernel_long_t 1568typedef __kernel_long_t kernel_long_t; 1569typedef __kernel_ulong_t kernel_ulong_t; 1570#else 1571# ifdef X32 1572typedef long long kernel_long_t; 1573typedef unsigned long long kernel_ulong_t; 1574# else 1575typedef long kernel_long_t; 1576typedef unsigned long kernel_ulong_t; 1577# endif 1578#endif 1579 1580/* 1581 * Check the syscall return value register value for whether it is 1582 * a negated errno code indicating an error, or a success return value. 1583 */ 1584static inline bool 1585is_negated_errno(kernel_ulong_t val) 1586{ 1587 /* Linux kernel defines MAX_ERRNO to 4095. */ 1588 kernel_ulong_t max = -(kernel_long_t) 4095; 1589 1590#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 1591 if (current_wordsize < sizeof(val)) { 1592 val = (uint32_t) val; 1593 max = (uint32_t) max; 1594 } 1595#elif defined X32 1596 /* 1597 * current_wordsize is 4 even in personality 0 (native X32) 1598 * but truncation _must not_ be done in it. 1599 * can't check current_wordsize here! 1600 */ 1601 if (current_personality != 0) { 1602 val = (uint32_t) val; 1603 max = (uint32_t) max; 1604 } 1605#endif 1606 1607 return val >= max; 1608} 1609 1610/* Called at each syscall entry. 1611 * Returns: 1612 * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently. 1613 * 1: ok, continue in trace_syscall_entering(). 1614 * other: error, trace_syscall_entering() should print error indicator 1615 * ("????" etc) and bail out. 1616 */ 1617static int 1618syscall_fixup_on_sysenter(struct tcb *tcp) 1619{ 1620 /* Do we have post-execve SIGTRAP suppressed? */ 1621 if (ptrace_setoptions & PTRACE_O_TRACEEXEC) 1622 return 1; 1623 1624 /* 1625 * No, unfortunately. Apply -ENOSYS heuristics. 1626 * We don't have to workaround SECCOMP_RET_ERRNO side effects 1627 * because any kernel with SECCOMP_RET_ERRNO support surely 1628 * implements PTRACE_O_TRACEEXEC. 1629 */ 1630#if defined(I386) 1631 if (i386_regs.eax != -ENOSYS) { 1632 if (debug_flag) 1633 fprintf(stderr, "not a syscall entry (eax = %ld)\n", 1634 i386_regs.eax); 1635 return 0; 1636 } 1637#elif defined(X86_64) || defined(X32) 1638 if (x86_io.iov_len == sizeof(i386_regs)) { 1639 if ((int) i386_regs.eax != -ENOSYS) { 1640 if (debug_flag) 1641 fprintf(stderr, 1642 "not a syscall entry (eax = %d)\n", 1643 (int) i386_regs.eax); 1644 return 0; 1645 } 1646 } else { 1647 if ((long long) x86_64_regs.rax != -ENOSYS) { 1648 if (debug_flag) 1649 fprintf(stderr, 1650 "not a syscall entry (rax = %lld)\n", 1651 (long long) x86_64_regs.rax); 1652 return 0; 1653 } 1654 } 1655#elif defined(M68K) 1656 /* TODO? Eliminate upeek's in arches below like we did in x86 */ 1657 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1658 return -1; 1659 if (m68k_d0 != -ENOSYS) { 1660 if (debug_flag) 1661 fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0); 1662 return 0; 1663 } 1664#elif defined(IA64) 1665 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1666 return -1; 1667 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1668 return -1; 1669 if (ia64_ia32mode && ia64_r8 != -ENOSYS) { 1670 if (debug_flag) 1671 fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8); 1672 return 0; 1673 } 1674#elif defined(CRISV10) || defined(CRISV32) 1675 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1676 return -1; 1677 if (cris_r10 != -ENOSYS) { 1678 if (debug_flag) 1679 fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10); 1680 return 0; 1681 } 1682#elif defined(MICROBLAZE) 1683 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1684 return -1; 1685 if (microblaze_r3 != -ENOSYS) { 1686 if (debug_flag) 1687 fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3); 1688 return 0; 1689 } 1690#endif 1691 return 1; 1692} 1693 1694static void 1695internal_fork(struct tcb *tcp) 1696{ 1697#if defined S390 || defined S390X || defined CRISV10 || defined CRISV32 1698# define ARG_FLAGS 1 1699#else 1700# define ARG_FLAGS 0 1701#endif 1702#ifndef CLONE_UNTRACED 1703# define CLONE_UNTRACED 0x00800000 1704#endif 1705 if ((ptrace_setoptions 1706 & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1707 == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK)) 1708 return; 1709 1710 if (!followfork) 1711 return; 1712 1713 if (entering(tcp)) { 1714 /* 1715 * We won't see the new child if clone is called with 1716 * CLONE_UNTRACED, so we keep the same logic with that option 1717 * and don't trace it. 1718 */ 1719 if ((tcp->s_ent->sys_func == sys_clone) 1720 && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED) 1721 ) 1722 return; 1723 setbpt(tcp); 1724 } else { 1725 if (tcp->flags & TCB_BPTSET) 1726 clearbpt(tcp); 1727 } 1728} 1729 1730#if defined(TCB_WAITEXECVE) 1731static void 1732internal_exec(struct tcb *tcp) 1733{ 1734 /* Maybe we have post-execve SIGTRAP suppressed? */ 1735 if (ptrace_setoptions & PTRACE_O_TRACEEXEC) 1736 return; /* yes, no need to do anything */ 1737 1738 if (exiting(tcp) && syserror(tcp)) 1739 /* Error in execve, no post-execve SIGTRAP expected */ 1740 tcp->flags &= ~TCB_WAITEXECVE; 1741 else 1742 tcp->flags |= TCB_WAITEXECVE; 1743} 1744#endif 1745 1746static void 1747syscall_fixup_for_fork_exec(struct tcb *tcp) 1748{ 1749 /* 1750 * We must always trace a few critical system calls in order to 1751 * correctly support following forks in the presence of tracing 1752 * qualifiers. 1753 */ 1754 int (*func)(); 1755 1756 func = tcp->s_ent->sys_func; 1757 1758 if ( sys_fork == func 1759 || sys_clone == func 1760 ) { 1761 internal_fork(tcp); 1762 return; 1763 } 1764 1765#if defined(TCB_WAITEXECVE) 1766 if ( sys_execve == func 1767# if defined(SPARC) || defined(SPARC64) 1768 || sys_execv == func 1769# endif 1770 ) { 1771 internal_exec(tcp); 1772 return; 1773 } 1774#endif 1775} 1776 1777/* Return -1 on error or 1 on success (never 0!) */ 1778static int 1779get_syscall_args(struct tcb *tcp) 1780{ 1781 int i, nargs; 1782 1783 nargs = tcp->s_ent->nargs; 1784 1785#if defined(S390) || defined(S390X) 1786 for (i = 0; i < nargs; ++i) 1787 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0) 1788 return -1; 1789#elif defined(ALPHA) 1790 for (i = 0; i < nargs; ++i) 1791 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1792 return -1; 1793#elif defined(IA64) 1794 if (!ia64_ia32mode) { 1795 unsigned long *out0, cfm, sof, sol; 1796 long rbs_end; 1797 /* be backwards compatible with kernel < 2.4.4... */ 1798# ifndef PT_RBS_END 1799# define PT_RBS_END PT_AR_BSP 1800# endif 1801 1802 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1803 return -1; 1804 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1805 return -1; 1806 1807 sof = (cfm >> 0) & 0x7f; 1808 sol = (cfm >> 7) & 0x7f; 1809 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1810 1811 for (i = 0; i < nargs; ++i) { 1812 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1813 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1814 return -1; 1815 } 1816 } else { 1817 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1818 PT_R9 /* ECX = out1 */, 1819 PT_R10 /* EDX = out2 */, 1820 PT_R14 /* ESI = out3 */, 1821 PT_R15 /* EDI = out4 */, 1822 PT_R13 /* EBP = out5 */}; 1823 1824 for (i = 0; i < nargs; ++i) { 1825 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1826 return -1; 1827 /* truncate away IVE sign-extension */ 1828 tcp->u_arg[i] &= 0xffffffff; 1829 } 1830 } 1831#elif defined LINUX_MIPSN64 1832 (void)i; 1833 (void)nargs; 1834 tcp->u_arg[0] = mips_REG_A0; 1835 tcp->u_arg[1] = mips_REG_A1; 1836 tcp->u_arg[2] = mips_REG_A2; 1837 tcp->u_arg[3] = mips_REG_A3; 1838 tcp->u_arg[4] = mips_REG_A4; 1839 tcp->u_arg[5] = mips_REG_A5; 1840#elif defined LINUX_MIPSN32 1841 (void)i; 1842 (void)nargs; 1843 tcp->u_arg[0] = tcp->ext_arg[0] = mips_REG_A0; 1844 tcp->u_arg[1] = tcp->ext_arg[1] = mips_REG_A1; 1845 tcp->u_arg[2] = tcp->ext_arg[2] = mips_REG_A2; 1846 tcp->u_arg[3] = tcp->ext_arg[3] = mips_REG_A3; 1847 tcp->u_arg[4] = tcp->ext_arg[4] = mips_REG_A4; 1848 tcp->u_arg[5] = tcp->ext_arg[5] = mips_REG_A5; 1849#elif defined LINUX_MIPSO32 1850 (void)i; 1851 (void)nargs; 1852 tcp->u_arg[0] = mips_REG_A0; 1853 tcp->u_arg[1] = mips_REG_A1; 1854 tcp->u_arg[2] = mips_REG_A2; 1855 tcp->u_arg[3] = mips_REG_A3; 1856 if (nargs > 4) { 1857 umoven(tcp, mips_REG_SP + 4 * 4, 1858 (nargs - 4) * sizeof(tcp->u_arg[0]), 1859 (char *)(tcp->u_arg + 4)); 1860 } 1861#elif defined(POWERPC) 1862 (void)i; 1863 (void)nargs; 1864 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1865 tcp->u_arg[1] = ppc_regs.gpr[4]; 1866 tcp->u_arg[2] = ppc_regs.gpr[5]; 1867 tcp->u_arg[3] = ppc_regs.gpr[6]; 1868 tcp->u_arg[4] = ppc_regs.gpr[7]; 1869 tcp->u_arg[5] = ppc_regs.gpr[8]; 1870#elif defined(SPARC) || defined(SPARC64) 1871 for (i = 0; i < nargs; ++i) 1872 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1873#elif defined(HPPA) 1874 for (i = 0; i < nargs; ++i) 1875 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1876 return -1; 1877#elif defined(ARM) || defined(AARCH64) 1878# if defined(AARCH64) 1879 if (tcp->currpers == 1) 1880 for (i = 0; i < nargs; ++i) 1881 tcp->u_arg[i] = aarch64_regs.regs[i]; 1882 else 1883# endif 1884 for (i = 0; i < nargs; ++i) 1885 tcp->u_arg[i] = arm_regs.uregs[i]; 1886#elif defined(AVR32) 1887 (void)i; 1888 (void)nargs; 1889 tcp->u_arg[0] = avr32_regs.r12; 1890 tcp->u_arg[1] = avr32_regs.r11; 1891 tcp->u_arg[2] = avr32_regs.r10; 1892 tcp->u_arg[3] = avr32_regs.r9; 1893 tcp->u_arg[4] = avr32_regs.r5; 1894 tcp->u_arg[5] = avr32_regs.r3; 1895#elif defined(BFIN) 1896 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1897 1898 for (i = 0; i < nargs; ++i) 1899 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1900 return -1; 1901#elif defined(SH) 1902 static const int syscall_regs[MAX_ARGS] = { 1903 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1904 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1905 }; 1906 1907 for (i = 0; i < nargs; ++i) 1908 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1909 return -1; 1910#elif defined(SH64) 1911 int i; 1912 /* Registers used by SH5 Linux system calls for parameters */ 1913 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1914 1915 for (i = 0; i < nargs; ++i) 1916 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1917 return -1; 1918#elif defined(I386) 1919 (void)i; 1920 (void)nargs; 1921 tcp->u_arg[0] = i386_regs.ebx; 1922 tcp->u_arg[1] = i386_regs.ecx; 1923 tcp->u_arg[2] = i386_regs.edx; 1924 tcp->u_arg[3] = i386_regs.esi; 1925 tcp->u_arg[4] = i386_regs.edi; 1926 tcp->u_arg[5] = i386_regs.ebp; 1927#elif defined(X86_64) || defined(X32) 1928 (void)i; 1929 (void)nargs; 1930 if (x86_io.iov_len != sizeof(i386_regs)) { 1931 /* x86-64 or x32 ABI */ 1932 tcp->u_arg[0] = x86_64_regs.rdi; 1933 tcp->u_arg[1] = x86_64_regs.rsi; 1934 tcp->u_arg[2] = x86_64_regs.rdx; 1935 tcp->u_arg[3] = x86_64_regs.r10; 1936 tcp->u_arg[4] = x86_64_regs.r8; 1937 tcp->u_arg[5] = x86_64_regs.r9; 1938# ifdef X32 1939 tcp->ext_arg[0] = x86_64_regs.rdi; 1940 tcp->ext_arg[1] = x86_64_regs.rsi; 1941 tcp->ext_arg[2] = x86_64_regs.rdx; 1942 tcp->ext_arg[3] = x86_64_regs.r10; 1943 tcp->ext_arg[4] = x86_64_regs.r8; 1944 tcp->ext_arg[5] = x86_64_regs.r9; 1945# endif 1946 } else { 1947 /* i386 ABI */ 1948 /* Zero-extend from 32 bits */ 1949 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1950 * if you need to use *sign-extended* parameter. 1951 */ 1952 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1953 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1954 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1955 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1956 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1957 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1958 } 1959#elif defined(MICROBLAZE) 1960 for (i = 0; i < nargs; ++i) 1961 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1962 return -1; 1963#elif defined(CRISV10) || defined(CRISV32) 1964 static const int crisregs[MAX_ARGS] = { 1965 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1966 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1967 }; 1968 1969 for (i = 0; i < nargs; ++i) 1970 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1971 return -1; 1972#elif defined(TILE) 1973 for (i = 0; i < nargs; ++i) 1974 tcp->u_arg[i] = tile_regs.regs[i]; 1975#elif defined(M68K) 1976 for (i = 0; i < nargs; ++i) 1977 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1978 return -1; 1979#elif defined(OR1K) 1980 (void)nargs; 1981 for (i = 0; i < 6; ++i) 1982 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1983#elif defined(METAG) 1984 for (i = 0; i < nargs; i++) 1985 /* arguments go backwards from D1Ar1 (D1.3) */ 1986 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1987#elif defined(XTENSA) 1988 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1989 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1990 for (i = 0; i < nargs; ++i) 1991 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1992 return -1; 1993# elif defined(ARC) 1994 long *arc_args = &arc_regs.scratch.r0; 1995 for (i = 0; i < nargs; ++i) 1996 tcp->u_arg[i] = *arc_args--; 1997 1998#else /* Other architecture (32bits specific) */ 1999 for (i = 0; i < nargs; ++i) 2000 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 2001 return -1; 2002#endif 2003 return 1; 2004} 2005 2006static int 2007trace_syscall_entering(struct tcb *tcp) 2008{ 2009 int res, scno_good; 2010 2011#if defined TCB_WAITEXECVE 2012 if (tcp->flags & TCB_WAITEXECVE) { 2013 /* This is the post-execve SIGTRAP. */ 2014 tcp->flags &= ~TCB_WAITEXECVE; 2015 return 0; 2016 } 2017#endif 2018 2019 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 2020 if (res == 0) 2021 return res; 2022 if (res == 1) { 2023 res = syscall_fixup_on_sysenter(tcp); 2024 if (res == 0) 2025 return res; 2026 if (res == 1) 2027 res = get_syscall_args(tcp); 2028 } 2029 2030 if (res != 1) { 2031 printleader(tcp); 2032 if (scno_good != 1) 2033 tprints("????" /* anti-trigraph gap */ "("); 2034 else if (tcp->qual_flg & UNDEFINED_SCNO) 2035 tprintf("%s(", undefined_scno_name(tcp)); 2036 else 2037 tprintf("%s(", tcp->s_ent->sys_name); 2038 /* 2039 * " <unavailable>" will be added later by the code which 2040 * detects ptrace errors. 2041 */ 2042 goto ret; 2043 } 2044 2045 if ( sys_execve == tcp->s_ent->sys_func 2046# if defined(SPARC) || defined(SPARC64) 2047 || sys_execv == tcp->s_ent->sys_func 2048# endif 2049 ) { 2050 hide_log_until_execve = 0; 2051 } 2052 2053#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 2054 while (1) { 2055# ifdef SYS_socket_subcall 2056 if (tcp->s_ent->sys_func == sys_socketcall) { 2057 decode_socket_subcall(tcp); 2058 break; 2059 } 2060# endif 2061# ifdef SYS_ipc_subcall 2062 if (tcp->s_ent->sys_func == sys_ipc) { 2063 decode_ipc_subcall(tcp); 2064 break; 2065 } 2066# endif 2067 break; 2068 } 2069#endif 2070 2071 if (need_fork_exec_workarounds) 2072 syscall_fixup_for_fork_exec(tcp); 2073 2074 if (!(tcp->qual_flg & QUAL_TRACE) 2075 || (tracing_paths && !pathtrace_match(tcp)) 2076 ) { 2077 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 2078 return 0; 2079 } 2080 2081 tcp->flags &= ~TCB_FILTERED; 2082 2083 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 2084 res = 0; 2085 goto ret; 2086 } 2087 2088#ifdef USE_LIBUNWIND 2089 if (stack_trace_enabled) { 2090 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER) 2091 unwind_capture_stacktrace(tcp); 2092 } 2093#endif 2094 2095 printleader(tcp); 2096 if (tcp->qual_flg & UNDEFINED_SCNO) 2097 tprintf("%s(", undefined_scno_name(tcp)); 2098 else 2099 tprintf("%s(", tcp->s_ent->sys_name); 2100 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 2101 res = printargs(tcp); 2102 else 2103 res = tcp->s_ent->sys_func(tcp); 2104 2105 fflush(tcp->outf); 2106 ret: 2107 tcp->flags |= TCB_INSYSCALL; 2108 /* Measure the entrance time as late as possible to avoid errors. */ 2109 if (Tflag || cflag) 2110 gettimeofday(&tcp->etime, NULL); 2111 return res; 2112} 2113 2114/* Returns: 2115 * 1: ok, continue in trace_syscall_exiting(). 2116 * -1: error, trace_syscall_exiting() should print error indicator 2117 * ("????" etc) and bail out. 2118 */ 2119static int 2120get_syscall_result(struct tcb *tcp) 2121{ 2122#if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS 2123 /* already done by get_regs */ 2124#elif defined(S390) || defined(S390X) 2125 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 2126 return -1; 2127#elif defined(BFIN) 2128 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 2129 return -1; 2130#elif defined(IA64) 2131# define IA64_PSR_IS ((long)1 << 34) 2132 long psr; 2133 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 2134 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 2135 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 2136 return -1; 2137 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 2138 return -1; 2139#elif defined(M68K) 2140 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 2141 return -1; 2142#elif defined(ALPHA) 2143 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 2144 return -1; 2145 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 2146 return -1; 2147#elif defined(HPPA) 2148 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 2149 return -1; 2150#elif defined(SH) 2151 /* new syscall ABI returns result in R0 */ 2152 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 2153 return -1; 2154#elif defined(SH64) 2155 /* ABI defines result returned in r9 */ 2156 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 2157 return -1; 2158#elif defined(CRISV10) || defined(CRISV32) 2159 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 2160 return -1; 2161#elif defined(MICROBLAZE) 2162 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 2163 return -1; 2164#elif defined(XTENSA) 2165 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 2166 return -1; 2167#else 2168# error get_syscall_result is not implemented for this architecture 2169#endif 2170 return 1; 2171} 2172 2173/* Called at each syscall exit */ 2174static void 2175syscall_fixup_on_sysexit(struct tcb *tcp) 2176{ 2177#if defined(S390) || defined(S390X) 2178 if ((tcp->flags & TCB_WAITEXECVE) 2179 && (s390_gpr2 == -ENOSYS || s390_gpr2 == tcp->scno)) { 2180 /* 2181 * Return from execve. 2182 * Fake a return value of zero. We leave the TCB_WAITEXECVE 2183 * flag set for the post-execve SIGTRAP to see and reset. 2184 */ 2185 s390_gpr2 = 0; 2186 } 2187#endif 2188} 2189 2190/* Returns: 2191 * 1: ok, continue in trace_syscall_exiting(). 2192 * -1: error, trace_syscall_exiting() should print error indicator 2193 * ("????" etc) and bail out. 2194 */ 2195static void 2196get_error(struct tcb *tcp) 2197{ 2198 int u_error = 0; 2199 int check_errno = 1; 2200 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 2201 check_errno = 0; 2202 } 2203#if defined(S390) || defined(S390X) 2204 if (check_errno && is_negated_errno(s390_gpr2)) { 2205 tcp->u_rval = -1; 2206 u_error = -s390_gpr2; 2207 } 2208 else { 2209 tcp->u_rval = s390_gpr2; 2210 } 2211#elif defined(I386) 2212 if (check_errno && is_negated_errno(i386_regs.eax)) { 2213 tcp->u_rval = -1; 2214 u_error = -i386_regs.eax; 2215 } 2216 else { 2217 tcp->u_rval = i386_regs.eax; 2218 } 2219#elif defined(X86_64) || defined(X32) 2220 /* 2221 * In X32, return value is 64-bit (llseek uses one). 2222 * Using merely "long rax" would not work. 2223 */ 2224 kernel_long_t rax; 2225 2226 if (x86_io.iov_len == sizeof(i386_regs)) { 2227 /* Sign extend from 32 bits */ 2228 rax = (int32_t) i386_regs.eax; 2229 } else { 2230 rax = x86_64_regs.rax; 2231 } 2232 if (check_errno && is_negated_errno(rax)) { 2233 tcp->u_rval = -1; 2234 u_error = -rax; 2235 } 2236 else { 2237 tcp->u_rval = rax; 2238# ifdef X32 2239 /* tcp->u_rval contains a truncated value */ 2240 tcp->u_lrval = rax; 2241# endif 2242 } 2243#elif defined(IA64) 2244 if (ia64_ia32mode) { 2245 int err; 2246 2247 err = (int)ia64_r8; 2248 if (check_errno && is_negated_errno(err)) { 2249 tcp->u_rval = -1; 2250 u_error = -err; 2251 } 2252 else { 2253 tcp->u_rval = err; 2254 } 2255 } else { 2256 if (check_errno && ia64_r10) { 2257 tcp->u_rval = -1; 2258 u_error = ia64_r8; 2259 } else { 2260 tcp->u_rval = ia64_r8; 2261 } 2262 } 2263#elif defined(MIPS) 2264 if (check_errno && mips_REG_A3) { 2265 tcp->u_rval = -1; 2266 u_error = mips_REG_V0; 2267 } else { 2268# if defined LINUX_MIPSN32 2269 tcp->u_lrval = mips_REG_V0; 2270# endif 2271 tcp->u_rval = mips_REG_V0; 2272 } 2273#elif defined(POWERPC) 2274 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2275 tcp->u_rval = -1; 2276 u_error = ppc_regs.gpr[3]; 2277 } 2278 else { 2279 tcp->u_rval = ppc_regs.gpr[3]; 2280 } 2281#elif defined(M68K) 2282 if (check_errno && is_negated_errno(m68k_d0)) { 2283 tcp->u_rval = -1; 2284 u_error = -m68k_d0; 2285 } 2286 else { 2287 tcp->u_rval = m68k_d0; 2288 } 2289#elif defined(ARM) || defined(AARCH64) 2290# if defined(AARCH64) 2291 if (tcp->currpers == 1) { 2292 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2293 tcp->u_rval = -1; 2294 u_error = -aarch64_regs.regs[0]; 2295 } 2296 else { 2297 tcp->u_rval = aarch64_regs.regs[0]; 2298 } 2299 } 2300 else 2301# endif 2302 { 2303 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2304 tcp->u_rval = -1; 2305 u_error = -arm_regs.ARM_r0; 2306 } 2307 else { 2308 tcp->u_rval = arm_regs.ARM_r0; 2309 } 2310 } 2311#elif defined(AVR32) 2312 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2313 tcp->u_rval = -1; 2314 u_error = -avr32_regs.r12; 2315 } 2316 else { 2317 tcp->u_rval = avr32_regs.r12; 2318 } 2319#elif defined(BFIN) 2320 if (check_errno && is_negated_errno(bfin_r0)) { 2321 tcp->u_rval = -1; 2322 u_error = -bfin_r0; 2323 } else { 2324 tcp->u_rval = bfin_r0; 2325 } 2326#elif defined(ALPHA) 2327 if (check_errno && alpha_a3) { 2328 tcp->u_rval = -1; 2329 u_error = alpha_r0; 2330 } 2331 else { 2332 tcp->u_rval = alpha_r0; 2333 } 2334#elif defined(SPARC) 2335 if (check_errno && sparc_regs.psr & PSR_C) { 2336 tcp->u_rval = -1; 2337 u_error = sparc_regs.u_regs[U_REG_O0]; 2338 } 2339 else { 2340 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2341 } 2342#elif defined(SPARC64) 2343 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2344 tcp->u_rval = -1; 2345 u_error = sparc_regs.u_regs[U_REG_O0]; 2346 } 2347 else { 2348 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2349 } 2350#elif defined(HPPA) 2351 if (check_errno && is_negated_errno(hppa_r28)) { 2352 tcp->u_rval = -1; 2353 u_error = -hppa_r28; 2354 } 2355 else { 2356 tcp->u_rval = hppa_r28; 2357 } 2358#elif defined(SH) 2359 if (check_errno && is_negated_errno(sh_r0)) { 2360 tcp->u_rval = -1; 2361 u_error = -sh_r0; 2362 } 2363 else { 2364 tcp->u_rval = sh_r0; 2365 } 2366#elif defined(SH64) 2367 if (check_errno && is_negated_errno(sh64_r9)) { 2368 tcp->u_rval = -1; 2369 u_error = -sh64_r9; 2370 } 2371 else { 2372 tcp->u_rval = sh64_r9; 2373 } 2374#elif defined(METAG) 2375 /* result pointer in D0Re0 (D0.0) */ 2376 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2377 tcp->u_rval = -1; 2378 u_error = -metag_regs.dx[0][0]; 2379 } 2380 else { 2381 tcp->u_rval = metag_regs.dx[0][0]; 2382 } 2383#elif defined(CRISV10) || defined(CRISV32) 2384 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2385 tcp->u_rval = -1; 2386 u_error = -cris_r10; 2387 } 2388 else { 2389 tcp->u_rval = cris_r10; 2390 } 2391#elif defined(TILE) 2392 /* 2393 * The standard tile calling convention returns the value (or negative 2394 * errno) in r0, and zero (or positive errno) in r1. 2395 * Until at least kernel 3.8, however, the r1 value is not reflected 2396 * in ptregs at this point, so we use r0 here. 2397 */ 2398 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2399 tcp->u_rval = -1; 2400 u_error = -tile_regs.regs[0]; 2401 } else { 2402 tcp->u_rval = tile_regs.regs[0]; 2403 } 2404#elif defined(MICROBLAZE) 2405 if (check_errno && is_negated_errno(microblaze_r3)) { 2406 tcp->u_rval = -1; 2407 u_error = -microblaze_r3; 2408 } 2409 else { 2410 tcp->u_rval = microblaze_r3; 2411 } 2412#elif defined(OR1K) 2413 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2414 tcp->u_rval = -1; 2415 u_error = -or1k_regs.gpr[11]; 2416 } 2417 else { 2418 tcp->u_rval = or1k_regs.gpr[11]; 2419 } 2420#elif defined(XTENSA) 2421 if (check_errno && is_negated_errno(xtensa_a2)) { 2422 tcp->u_rval = -1; 2423 u_error = -xtensa_a2; 2424 } 2425 else { 2426 tcp->u_rval = xtensa_a2; 2427 } 2428#elif defined(ARC) 2429 if (check_errno && is_negated_errno(arc_regs.scratch.r0)) { 2430 tcp->u_rval = -1; 2431 u_error = -arc_regs.scratch.r0; 2432 } 2433 else { 2434 tcp->u_rval = arc_regs.scratch.r0; 2435 } 2436#endif 2437 tcp->u_error = u_error; 2438} 2439 2440static void 2441dumpio(struct tcb *tcp) 2442{ 2443 int (*func)(); 2444 2445 if (syserror(tcp)) 2446 return; 2447 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2448 return; 2449 func = tcp->s_ent->sys_func; 2450 if (func == printargs) 2451 return; 2452 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2453 if (func == sys_read || 2454 func == sys_pread || 2455 func == sys_recv || 2456 func == sys_recvfrom) { 2457 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2458 return; 2459 } else if (func == sys_readv) { 2460 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2461 return; 2462#if HAVE_SENDMSG 2463 } else if (func == sys_recvmsg) { 2464 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2465 return; 2466 } else if (func == sys_recvmmsg) { 2467 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2468 return; 2469#endif 2470 } 2471 } 2472 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2473 if (func == sys_write || 2474 func == sys_pwrite || 2475 func == sys_send || 2476 func == sys_sendto) 2477 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2478 else if (func == sys_writev) 2479 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2480#if HAVE_SENDMSG 2481 else if (func == sys_sendmsg) 2482 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2483 else if (func == sys_sendmmsg) 2484 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2485#endif 2486 } 2487} 2488 2489static int 2490trace_syscall_exiting(struct tcb *tcp) 2491{ 2492 int sys_res; 2493 struct timeval tv; 2494 int res; 2495 long u_error; 2496 2497 /* Measure the exit time as early as possible to avoid errors. */ 2498 if (Tflag || cflag) 2499 gettimeofday(&tv, NULL); 2500 2501#ifdef USE_LIBUNWIND 2502 if (stack_trace_enabled) { 2503 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE) 2504 unwind_cache_invalidate(tcp); 2505 } 2506#endif 2507 2508#if SUPPORTED_PERSONALITIES > 1 2509 update_personality(tcp, tcp->currpers); 2510#endif 2511 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2512 if (res == 1) { 2513 syscall_fixup_on_sysexit(tcp); /* never fails */ 2514 get_error(tcp); /* never fails */ 2515 if (need_fork_exec_workarounds) 2516 syscall_fixup_for_fork_exec(tcp); 2517 if (filtered(tcp) || hide_log_until_execve) 2518 goto ret; 2519 } 2520 2521 if (cflag) { 2522 count_syscall(tcp, &tv); 2523 if (cflag == CFLAG_ONLY_STATS) { 2524 goto ret; 2525 } 2526 } 2527 2528 /* If not in -ff mode, and printing_tcp != tcp, 2529 * then the log currently does not end with output 2530 * of _our syscall entry_, but with something else. 2531 * We need to say which syscall's return is this. 2532 * 2533 * Forced reprinting via TCB_REPRINT is used only by 2534 * "strace -ff -oLOG test/threaded_execve" corner case. 2535 * It's the only case when -ff mode needs reprinting. 2536 */ 2537 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2538 tcp->flags &= ~TCB_REPRINT; 2539 printleader(tcp); 2540 if (tcp->qual_flg & UNDEFINED_SCNO) 2541 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2542 else 2543 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2544 } 2545 printing_tcp = tcp; 2546 2547 if (res != 1) { 2548 /* There was error in one of prior ptrace ops */ 2549 tprints(") "); 2550 tabto(); 2551 tprints("= ? <unavailable>\n"); 2552 line_ended(); 2553 tcp->flags &= ~TCB_INSYSCALL; 2554 return res; 2555 } 2556 2557 sys_res = 0; 2558 if (tcp->qual_flg & QUAL_RAW) { 2559 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2560 } else { 2561 /* FIXME: not_failing_only (IOW, option -z) is broken: 2562 * failure of syscall is known only after syscall return. 2563 * Thus we end up with something like this on, say, ENOENT: 2564 * open("doesnt_exist", O_RDONLY <unfinished ...> 2565 * {next syscall decode} 2566 * whereas the intended result is that open(...) line 2567 * is not shown at all. 2568 */ 2569 if (not_failing_only && tcp->u_error) 2570 goto ret; /* ignore failed syscalls */ 2571 sys_res = tcp->s_ent->sys_func(tcp); 2572 } 2573 2574 tprints(") "); 2575 tabto(); 2576 u_error = tcp->u_error; 2577 if (tcp->qual_flg & QUAL_RAW) { 2578 if (u_error) 2579 tprintf("= -1 (errno %ld)", u_error); 2580 else 2581 tprintf("= %#lx", tcp->u_rval); 2582 } 2583 else if (!(sys_res & RVAL_NONE) && u_error) { 2584 switch (u_error) { 2585 /* Blocked signals do not interrupt any syscalls. 2586 * In this case syscalls don't return ERESTARTfoo codes. 2587 * 2588 * Deadly signals set to SIG_DFL interrupt syscalls 2589 * and kill the process regardless of which of the codes below 2590 * is returned by the interrupted syscall. 2591 * In some cases, kernel forces a kernel-generated deadly 2592 * signal to be unblocked and set to SIG_DFL (and thus cause 2593 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2594 * or SIGILL. (The alternative is to leave process spinning 2595 * forever on the faulty instruction - not useful). 2596 * 2597 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2598 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2599 * but kernel will always restart them. 2600 */ 2601 case ERESTARTSYS: 2602 /* Most common type of signal-interrupted syscall exit code. 2603 * The system call will be restarted with the same arguments 2604 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2605 */ 2606 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2607 break; 2608 case ERESTARTNOINTR: 2609 /* Rare. For example, fork() returns this if interrupted. 2610 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2611 */ 2612 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2613 break; 2614 case ERESTARTNOHAND: 2615 /* pause(), rt_sigsuspend() etc use this code. 2616 * SA_RESTART is ignored (assumed not set): 2617 * syscall won't restart (will return EINTR instead) 2618 * even after signal with SA_RESTART set. However, 2619 * after SIG_IGN or SIG_DFL signal it will restart 2620 * (thus the name "restart only if has no handler"). 2621 */ 2622 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2623 break; 2624 case ERESTART_RESTARTBLOCK: 2625 /* Syscalls like nanosleep(), poll() which can't be 2626 * restarted with their original arguments use this 2627 * code. Kernel will execute restart_syscall() instead, 2628 * which changes arguments before restarting syscall. 2629 * SA_RESTART is ignored (assumed not set) similarly 2630 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2631 * since restart data is saved in "restart block" 2632 * in task struct, and if signal handler uses a syscall 2633 * which in turn saves another such restart block, 2634 * old data is lost and restart becomes impossible) 2635 */ 2636 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2637 break; 2638 default: 2639 if ((unsigned long) u_error < nerrnos 2640 && errnoent[u_error]) 2641 tprintf("= -1 %s (%s)", errnoent[u_error], 2642 strerror(u_error)); 2643 else 2644 tprintf("= -1 ERRNO_%lu (%s)", u_error, 2645 strerror(u_error)); 2646 break; 2647 } 2648 if ((sys_res & RVAL_STR) && tcp->auxstr) 2649 tprintf(" (%s)", tcp->auxstr); 2650 } 2651 else { 2652 if (sys_res & RVAL_NONE) 2653 tprints("= ?"); 2654 else { 2655 switch (sys_res & RVAL_MASK) { 2656 case RVAL_HEX: 2657 tprintf("= %#lx", tcp->u_rval); 2658 break; 2659 case RVAL_OCTAL: 2660 tprintf("= %#lo", tcp->u_rval); 2661 break; 2662 case RVAL_UDECIMAL: 2663 tprintf("= %lu", tcp->u_rval); 2664 break; 2665 case RVAL_DECIMAL: 2666 tprintf("= %ld", tcp->u_rval); 2667 break; 2668 case RVAL_FD: 2669 if (show_fd_path) { 2670 tprints("= "); 2671 printfd(tcp, tcp->u_rval); 2672 } 2673 else 2674 tprintf("= %ld", tcp->u_rval); 2675 break; 2676#if defined(LINUX_MIPSN32) || defined(X32) 2677 /* 2678 case RVAL_LHEX: 2679 tprintf("= %#llx", tcp->u_lrval); 2680 break; 2681 case RVAL_LOCTAL: 2682 tprintf("= %#llo", tcp->u_lrval); 2683 break; 2684 */ 2685 case RVAL_LUDECIMAL: 2686 tprintf("= %llu", tcp->u_lrval); 2687 break; 2688 /* 2689 case RVAL_LDECIMAL: 2690 tprintf("= %lld", tcp->u_lrval); 2691 break; 2692 */ 2693#endif 2694 default: 2695 fprintf(stderr, 2696 "invalid rval format\n"); 2697 break; 2698 } 2699 } 2700 if ((sys_res & RVAL_STR) && tcp->auxstr) 2701 tprintf(" (%s)", tcp->auxstr); 2702 } 2703 if (Tflag) { 2704 tv_sub(&tv, &tv, &tcp->etime); 2705 tprintf(" <%ld.%06ld>", 2706 (long) tv.tv_sec, (long) tv.tv_usec); 2707 } 2708 tprints("\n"); 2709 dumpio(tcp); 2710 line_ended(); 2711 2712#ifdef USE_LIBUNWIND 2713 if (stack_trace_enabled) 2714 unwind_print_stacktrace(tcp); 2715#endif 2716 2717 ret: 2718 tcp->flags &= ~TCB_INSYSCALL; 2719 return 0; 2720} 2721 2722int 2723trace_syscall(struct tcb *tcp) 2724{ 2725 return exiting(tcp) ? 2726 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2727} 2728