syscall.c revision 23ce9e48b54bd8bfec5b8768c85173fe4038ebac
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) 705static bool ia64_ia32mode; 706static long ia64_r8, ia64_r10; 707#elif defined(POWERPC) 708struct pt_regs ppc_regs; /* not static */ 709# define ARCH_REGS_FOR_GETREGS ppc_regs 710#elif defined(M68K) 711static long m68k_d0; 712#elif defined(BFIN) 713static long bfin_r0; 714#elif defined(ARM) 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; /* not static */ 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/* Return -1 on error or 1 on success (never 0!) */ 1611static int 1612get_syscall_args(struct tcb *tcp) 1613{ 1614 int i, nargs; 1615 1616 nargs = tcp->s_ent->nargs; 1617 1618#if defined(S390) || defined(S390X) 1619 for (i = 0; i < nargs; ++i) 1620 if (upeek(tcp->pid, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0) 1621 return -1; 1622#elif defined(ALPHA) 1623 for (i = 0; i < nargs; ++i) 1624 if (upeek(tcp->pid, REG_A0+i, &tcp->u_arg[i]) < 0) 1625 return -1; 1626#elif defined(IA64) 1627 if (!ia64_ia32mode) { 1628 unsigned long *out0, cfm, sof, sol; 1629 long rbs_end; 1630 /* be backwards compatible with kernel < 2.4.4... */ 1631# ifndef PT_RBS_END 1632# define PT_RBS_END PT_AR_BSP 1633# endif 1634 1635 if (upeek(tcp->pid, PT_RBS_END, &rbs_end) < 0) 1636 return -1; 1637 if (upeek(tcp->pid, PT_CFM, (long *) &cfm) < 0) 1638 return -1; 1639 1640 sof = (cfm >> 0) & 0x7f; 1641 sol = (cfm >> 7) & 0x7f; 1642 out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol); 1643 1644 for (i = 0; i < nargs; ++i) { 1645 if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i), 1646 sizeof(long), (char *) &tcp->u_arg[i]) < 0) 1647 return -1; 1648 } 1649 } else { 1650 static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */, 1651 PT_R9 /* ECX = out1 */, 1652 PT_R10 /* EDX = out2 */, 1653 PT_R14 /* ESI = out3 */, 1654 PT_R15 /* EDI = out4 */, 1655 PT_R13 /* EBP = out5 */}; 1656 1657 for (i = 0; i < nargs; ++i) { 1658 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1659 return -1; 1660 /* truncate away IVE sign-extension */ 1661 tcp->u_arg[i] &= 0xffffffff; 1662 } 1663 } 1664#elif defined LINUX_MIPSN64 1665 (void)i; 1666 (void)nargs; 1667 tcp->u_arg[0] = mips_REG_A0; 1668 tcp->u_arg[1] = mips_REG_A1; 1669 tcp->u_arg[2] = mips_REG_A2; 1670 tcp->u_arg[3] = mips_REG_A3; 1671 tcp->u_arg[4] = mips_REG_A4; 1672 tcp->u_arg[5] = mips_REG_A5; 1673#elif defined LINUX_MIPSN32 1674 (void)i; 1675 (void)nargs; 1676 tcp->u_arg[0] = tcp->ext_arg[0] = mips_REG_A0; 1677 tcp->u_arg[1] = tcp->ext_arg[1] = mips_REG_A1; 1678 tcp->u_arg[2] = tcp->ext_arg[2] = mips_REG_A2; 1679 tcp->u_arg[3] = tcp->ext_arg[3] = mips_REG_A3; 1680 tcp->u_arg[4] = tcp->ext_arg[4] = mips_REG_A4; 1681 tcp->u_arg[5] = tcp->ext_arg[5] = mips_REG_A5; 1682#elif defined LINUX_MIPSO32 1683 (void)i; 1684 (void)nargs; 1685 tcp->u_arg[0] = mips_REG_A0; 1686 tcp->u_arg[1] = mips_REG_A1; 1687 tcp->u_arg[2] = mips_REG_A2; 1688 tcp->u_arg[3] = mips_REG_A3; 1689 if (nargs > 4) { 1690 umoven(tcp, mips_REG_SP + 4 * 4, 1691 (nargs - 4) * sizeof(tcp->u_arg[0]), 1692 (char *)(tcp->u_arg + 4)); 1693 } 1694#elif defined(POWERPC) 1695 (void)i; 1696 (void)nargs; 1697 tcp->u_arg[0] = ppc_regs.orig_gpr3; 1698 tcp->u_arg[1] = ppc_regs.gpr[4]; 1699 tcp->u_arg[2] = ppc_regs.gpr[5]; 1700 tcp->u_arg[3] = ppc_regs.gpr[6]; 1701 tcp->u_arg[4] = ppc_regs.gpr[7]; 1702 tcp->u_arg[5] = ppc_regs.gpr[8]; 1703#elif defined(SPARC) || defined(SPARC64) 1704 for (i = 0; i < nargs; ++i) 1705 tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i]; 1706#elif defined(HPPA) 1707 for (i = 0; i < nargs; ++i) 1708 if (upeek(tcp->pid, PT_GR26-4*i, &tcp->u_arg[i]) < 0) 1709 return -1; 1710#elif defined(ARM) || defined(AARCH64) 1711# if defined(AARCH64) 1712 if (tcp->currpers == 1) 1713 for (i = 0; i < nargs; ++i) 1714 tcp->u_arg[i] = aarch64_regs.regs[i]; 1715 else 1716# endif 1717 for (i = 0; i < nargs; ++i) 1718 tcp->u_arg[i] = arm_regs.uregs[i]; 1719#elif defined(AVR32) 1720 (void)i; 1721 (void)nargs; 1722 tcp->u_arg[0] = avr32_regs.r12; 1723 tcp->u_arg[1] = avr32_regs.r11; 1724 tcp->u_arg[2] = avr32_regs.r10; 1725 tcp->u_arg[3] = avr32_regs.r9; 1726 tcp->u_arg[4] = avr32_regs.r5; 1727 tcp->u_arg[5] = avr32_regs.r3; 1728#elif defined(BFIN) 1729 static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 }; 1730 1731 for (i = 0; i < nargs; ++i) 1732 if (upeek(tcp->pid, argreg[i], &tcp->u_arg[i]) < 0) 1733 return -1; 1734#elif defined(SH) 1735 static const int syscall_regs[MAX_ARGS] = { 1736 4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6), 1737 4 * (REG_REG0+7), 4 * (REG_REG0 ), 4 * (REG_REG0+1) 1738 }; 1739 1740 for (i = 0; i < nargs; ++i) 1741 if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0) 1742 return -1; 1743#elif defined(SH64) 1744 int i; 1745 /* Registers used by SH5 Linux system calls for parameters */ 1746 static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 }; 1747 1748 for (i = 0; i < nargs; ++i) 1749 if (upeek(tcp->pid, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0) 1750 return -1; 1751#elif defined(I386) 1752 (void)i; 1753 (void)nargs; 1754 tcp->u_arg[0] = i386_regs.ebx; 1755 tcp->u_arg[1] = i386_regs.ecx; 1756 tcp->u_arg[2] = i386_regs.edx; 1757 tcp->u_arg[3] = i386_regs.esi; 1758 tcp->u_arg[4] = i386_regs.edi; 1759 tcp->u_arg[5] = i386_regs.ebp; 1760#elif defined(X86_64) || defined(X32) 1761 (void)i; 1762 (void)nargs; 1763 if (x86_io.iov_len != sizeof(i386_regs)) { 1764 /* x86-64 or x32 ABI */ 1765 tcp->u_arg[0] = x86_64_regs.rdi; 1766 tcp->u_arg[1] = x86_64_regs.rsi; 1767 tcp->u_arg[2] = x86_64_regs.rdx; 1768 tcp->u_arg[3] = x86_64_regs.r10; 1769 tcp->u_arg[4] = x86_64_regs.r8; 1770 tcp->u_arg[5] = x86_64_regs.r9; 1771# ifdef X32 1772 tcp->ext_arg[0] = x86_64_regs.rdi; 1773 tcp->ext_arg[1] = x86_64_regs.rsi; 1774 tcp->ext_arg[2] = x86_64_regs.rdx; 1775 tcp->ext_arg[3] = x86_64_regs.r10; 1776 tcp->ext_arg[4] = x86_64_regs.r8; 1777 tcp->ext_arg[5] = x86_64_regs.r9; 1778# endif 1779 } else { 1780 /* i386 ABI */ 1781 /* Zero-extend from 32 bits */ 1782 /* Use widen_to_long(tcp->u_arg[N]) in syscall handlers 1783 * if you need to use *sign-extended* parameter. 1784 */ 1785 tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx; 1786 tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx; 1787 tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx; 1788 tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi; 1789 tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi; 1790 tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp; 1791 } 1792#elif defined(MICROBLAZE) 1793 for (i = 0; i < nargs; ++i) 1794 if (upeek(tcp->pid, (5 + i) * 4, &tcp->u_arg[i]) < 0) 1795 return -1; 1796#elif defined(CRISV10) || defined(CRISV32) 1797 static const int crisregs[MAX_ARGS] = { 1798 4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12, 1799 4*PT_R13 , 4*PT_MOF, 4*PT_SRP 1800 }; 1801 1802 for (i = 0; i < nargs; ++i) 1803 if (upeek(tcp->pid, crisregs[i], &tcp->u_arg[i]) < 0) 1804 return -1; 1805#elif defined(TILE) 1806 for (i = 0; i < nargs; ++i) 1807 tcp->u_arg[i] = tile_regs.regs[i]; 1808#elif defined(M68K) 1809 for (i = 0; i < nargs; ++i) 1810 if (upeek(tcp->pid, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0) 1811 return -1; 1812#elif defined(OR1K) 1813 (void)nargs; 1814 for (i = 0; i < 6; ++i) 1815 tcp->u_arg[i] = or1k_regs.gpr[3 + i]; 1816#elif defined(METAG) 1817 for (i = 0; i < nargs; i++) 1818 /* arguments go backwards from D1Ar1 (D1.3) */ 1819 tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i]; 1820#elif defined(XTENSA) 1821 /* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */ 1822 static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 }; 1823 for (i = 0; i < nargs; ++i) 1824 if (upeek(tcp->pid, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0) 1825 return -1; 1826# elif defined(ARC) 1827 long *arc_args = &arc_regs.scratch.r0; 1828 for (i = 0; i < nargs; ++i) 1829 tcp->u_arg[i] = *arc_args--; 1830 1831#else /* Other architecture (32bits specific) */ 1832 for (i = 0; i < nargs; ++i) 1833 if (upeek(tcp->pid, i*4, &tcp->u_arg[i]) < 0) 1834 return -1; 1835#endif 1836 return 1; 1837} 1838 1839static int 1840trace_syscall_entering(struct tcb *tcp) 1841{ 1842 int res, scno_good; 1843 1844 scno_good = res = (get_regs_error ? -1 : get_scno(tcp)); 1845 if (res == 0) 1846 return res; 1847 if (res == 1) 1848 res = get_syscall_args(tcp); 1849 1850 if (res != 1) { 1851 printleader(tcp); 1852 if (scno_good != 1) 1853 tprints("????" /* anti-trigraph gap */ "("); 1854 else if (tcp->qual_flg & UNDEFINED_SCNO) 1855 tprintf("%s(", undefined_scno_name(tcp)); 1856 else 1857 tprintf("%s(", tcp->s_ent->sys_name); 1858 /* 1859 * " <unavailable>" will be added later by the code which 1860 * detects ptrace errors. 1861 */ 1862 goto ret; 1863 } 1864 1865 if ( sys_execve == tcp->s_ent->sys_func 1866# if defined(SPARC) || defined(SPARC64) 1867 || sys_execv == tcp->s_ent->sys_func 1868# endif 1869 ) { 1870 hide_log_until_execve = 0; 1871 } 1872 1873#if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall) 1874 while (1) { 1875# ifdef SYS_socket_subcall 1876 if (tcp->s_ent->sys_func == sys_socketcall) { 1877 decode_socket_subcall(tcp); 1878 break; 1879 } 1880# endif 1881# ifdef SYS_ipc_subcall 1882 if (tcp->s_ent->sys_func == sys_ipc) { 1883 decode_ipc_subcall(tcp); 1884 break; 1885 } 1886# endif 1887 break; 1888 } 1889#endif 1890 1891 if (!(tcp->qual_flg & QUAL_TRACE) 1892 || (tracing_paths && !pathtrace_match(tcp)) 1893 ) { 1894 tcp->flags |= TCB_INSYSCALL | TCB_FILTERED; 1895 return 0; 1896 } 1897 1898 tcp->flags &= ~TCB_FILTERED; 1899 1900 if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) { 1901 res = 0; 1902 goto ret; 1903 } 1904 1905#ifdef USE_LIBUNWIND 1906 if (stack_trace_enabled) { 1907 if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER) 1908 unwind_capture_stacktrace(tcp); 1909 } 1910#endif 1911 1912 printleader(tcp); 1913 if (tcp->qual_flg & UNDEFINED_SCNO) 1914 tprintf("%s(", undefined_scno_name(tcp)); 1915 else 1916 tprintf("%s(", tcp->s_ent->sys_name); 1917 if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit) 1918 res = printargs(tcp); 1919 else 1920 res = tcp->s_ent->sys_func(tcp); 1921 1922 fflush(tcp->outf); 1923 ret: 1924 tcp->flags |= TCB_INSYSCALL; 1925 /* Measure the entrance time as late as possible to avoid errors. */ 1926 if (Tflag || cflag) 1927 gettimeofday(&tcp->etime, NULL); 1928 return res; 1929} 1930 1931/* Returns: 1932 * 1: ok, continue in trace_syscall_exiting(). 1933 * -1: error, trace_syscall_exiting() should print error indicator 1934 * ("????" etc) and bail out. 1935 */ 1936static int 1937get_syscall_result(struct tcb *tcp) 1938{ 1939#if defined ARCH_REGS_FOR_GETREGSET || defined ARCH_REGS_FOR_GETREGS 1940 /* already done by get_regs */ 1941#elif defined(S390) || defined(S390X) 1942 if (upeek(tcp->pid, PT_GPR2, &s390_gpr2) < 0) 1943 return -1; 1944#elif defined(BFIN) 1945 if (upeek(tcp->pid, PT_R0, &bfin_r0) < 0) 1946 return -1; 1947#elif defined(IA64) 1948# define IA64_PSR_IS ((long)1 << 34) 1949 long psr; 1950 if (upeek(tcp->pid, PT_CR_IPSR, &psr) >= 0) 1951 ia64_ia32mode = ((psr & IA64_PSR_IS) != 0); 1952 if (upeek(tcp->pid, PT_R8, &ia64_r8) < 0) 1953 return -1; 1954 if (upeek(tcp->pid, PT_R10, &ia64_r10) < 0) 1955 return -1; 1956#elif defined(M68K) 1957 if (upeek(tcp->pid, 4*PT_D0, &m68k_d0) < 0) 1958 return -1; 1959#elif defined(ALPHA) 1960 if (upeek(tcp->pid, REG_A3, &alpha_a3) < 0) 1961 return -1; 1962 if (upeek(tcp->pid, REG_R0, &alpha_r0) < 0) 1963 return -1; 1964#elif defined(HPPA) 1965 if (upeek(tcp->pid, PT_GR28, &hppa_r28) < 0) 1966 return -1; 1967#elif defined(SH) 1968 /* new syscall ABI returns result in R0 */ 1969 if (upeek(tcp->pid, 4*REG_REG0, (long *)&sh_r0) < 0) 1970 return -1; 1971#elif defined(SH64) 1972 /* ABI defines result returned in r9 */ 1973 if (upeek(tcp->pid, REG_GENERAL(9), (long *)&sh64_r9) < 0) 1974 return -1; 1975#elif defined(CRISV10) || defined(CRISV32) 1976 if (upeek(tcp->pid, 4*PT_R10, &cris_r10) < 0) 1977 return -1; 1978#elif defined(MICROBLAZE) 1979 if (upeek(tcp->pid, 3 * 4, µblaze_r3) < 0) 1980 return -1; 1981#elif defined(XTENSA) 1982 if (upeek(tcp->pid, REG_A_BASE + 2, &xtensa_a2) < 0) 1983 return -1; 1984#else 1985# error get_syscall_result is not implemented for this architecture 1986#endif 1987 return 1; 1988} 1989 1990/* Returns: 1991 * 1: ok, continue in trace_syscall_exiting(). 1992 * -1: error, trace_syscall_exiting() should print error indicator 1993 * ("????" etc) and bail out. 1994 */ 1995static void 1996get_error(struct tcb *tcp) 1997{ 1998 int u_error = 0; 1999 int check_errno = 1; 2000 if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) { 2001 check_errno = 0; 2002 } 2003#if defined(S390) || defined(S390X) 2004 if (check_errno && is_negated_errno(s390_gpr2)) { 2005 tcp->u_rval = -1; 2006 u_error = -s390_gpr2; 2007 } 2008 else { 2009 tcp->u_rval = s390_gpr2; 2010 } 2011#elif defined(I386) 2012 if (check_errno && is_negated_errno(i386_regs.eax)) { 2013 tcp->u_rval = -1; 2014 u_error = -i386_regs.eax; 2015 } 2016 else { 2017 tcp->u_rval = i386_regs.eax; 2018 } 2019#elif defined(X86_64) || defined(X32) 2020 /* 2021 * In X32, return value is 64-bit (llseek uses one). 2022 * Using merely "long rax" would not work. 2023 */ 2024 kernel_long_t rax; 2025 2026 if (x86_io.iov_len == sizeof(i386_regs)) { 2027 /* Sign extend from 32 bits */ 2028 rax = (int32_t) i386_regs.eax; 2029 } else { 2030 rax = x86_64_regs.rax; 2031 } 2032 if (check_errno && is_negated_errno(rax)) { 2033 tcp->u_rval = -1; 2034 u_error = -rax; 2035 } 2036 else { 2037 tcp->u_rval = rax; 2038# ifdef X32 2039 /* tcp->u_rval contains a truncated value */ 2040 tcp->u_lrval = rax; 2041# endif 2042 } 2043#elif defined(IA64) 2044 if (ia64_ia32mode) { 2045 int err; 2046 2047 err = (int)ia64_r8; 2048 if (check_errno && is_negated_errno(err)) { 2049 tcp->u_rval = -1; 2050 u_error = -err; 2051 } 2052 else { 2053 tcp->u_rval = err; 2054 } 2055 } else { 2056 if (check_errno && ia64_r10) { 2057 tcp->u_rval = -1; 2058 u_error = ia64_r8; 2059 } else { 2060 tcp->u_rval = ia64_r8; 2061 } 2062 } 2063#elif defined(MIPS) 2064 if (check_errno && mips_REG_A3) { 2065 tcp->u_rval = -1; 2066 u_error = mips_REG_V0; 2067 } else { 2068# if defined LINUX_MIPSN32 2069 tcp->u_lrval = mips_REG_V0; 2070# endif 2071 tcp->u_rval = mips_REG_V0; 2072 } 2073#elif defined(POWERPC) 2074 if (check_errno && (ppc_regs.ccr & 0x10000000)) { 2075 tcp->u_rval = -1; 2076 u_error = ppc_regs.gpr[3]; 2077 } 2078 else { 2079 tcp->u_rval = ppc_regs.gpr[3]; 2080 } 2081#elif defined(M68K) 2082 if (check_errno && is_negated_errno(m68k_d0)) { 2083 tcp->u_rval = -1; 2084 u_error = -m68k_d0; 2085 } 2086 else { 2087 tcp->u_rval = m68k_d0; 2088 } 2089#elif defined(ARM) || defined(AARCH64) 2090# if defined(AARCH64) 2091 if (tcp->currpers == 1) { 2092 if (check_errno && is_negated_errno(aarch64_regs.regs[0])) { 2093 tcp->u_rval = -1; 2094 u_error = -aarch64_regs.regs[0]; 2095 } 2096 else { 2097 tcp->u_rval = aarch64_regs.regs[0]; 2098 } 2099 } 2100 else 2101# endif 2102 { 2103 if (check_errno && is_negated_errno(arm_regs.ARM_r0)) { 2104 tcp->u_rval = -1; 2105 u_error = -arm_regs.ARM_r0; 2106 } 2107 else { 2108 tcp->u_rval = arm_regs.ARM_r0; 2109 } 2110 } 2111#elif defined(AVR32) 2112 if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) { 2113 tcp->u_rval = -1; 2114 u_error = -avr32_regs.r12; 2115 } 2116 else { 2117 tcp->u_rval = avr32_regs.r12; 2118 } 2119#elif defined(BFIN) 2120 if (check_errno && is_negated_errno(bfin_r0)) { 2121 tcp->u_rval = -1; 2122 u_error = -bfin_r0; 2123 } else { 2124 tcp->u_rval = bfin_r0; 2125 } 2126#elif defined(ALPHA) 2127 if (check_errno && alpha_a3) { 2128 tcp->u_rval = -1; 2129 u_error = alpha_r0; 2130 } 2131 else { 2132 tcp->u_rval = alpha_r0; 2133 } 2134#elif defined(SPARC) 2135 if (check_errno && sparc_regs.psr & PSR_C) { 2136 tcp->u_rval = -1; 2137 u_error = sparc_regs.u_regs[U_REG_O0]; 2138 } 2139 else { 2140 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2141 } 2142#elif defined(SPARC64) 2143 if (check_errno && sparc_regs.tstate & 0x1100000000UL) { 2144 tcp->u_rval = -1; 2145 u_error = sparc_regs.u_regs[U_REG_O0]; 2146 } 2147 else { 2148 tcp->u_rval = sparc_regs.u_regs[U_REG_O0]; 2149 } 2150#elif defined(HPPA) 2151 if (check_errno && is_negated_errno(hppa_r28)) { 2152 tcp->u_rval = -1; 2153 u_error = -hppa_r28; 2154 } 2155 else { 2156 tcp->u_rval = hppa_r28; 2157 } 2158#elif defined(SH) 2159 if (check_errno && is_negated_errno(sh_r0)) { 2160 tcp->u_rval = -1; 2161 u_error = -sh_r0; 2162 } 2163 else { 2164 tcp->u_rval = sh_r0; 2165 } 2166#elif defined(SH64) 2167 if (check_errno && is_negated_errno(sh64_r9)) { 2168 tcp->u_rval = -1; 2169 u_error = -sh64_r9; 2170 } 2171 else { 2172 tcp->u_rval = sh64_r9; 2173 } 2174#elif defined(METAG) 2175 /* result pointer in D0Re0 (D0.0) */ 2176 if (check_errno && is_negated_errno(metag_regs.dx[0][0])) { 2177 tcp->u_rval = -1; 2178 u_error = -metag_regs.dx[0][0]; 2179 } 2180 else { 2181 tcp->u_rval = metag_regs.dx[0][0]; 2182 } 2183#elif defined(CRISV10) || defined(CRISV32) 2184 if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) { 2185 tcp->u_rval = -1; 2186 u_error = -cris_r10; 2187 } 2188 else { 2189 tcp->u_rval = cris_r10; 2190 } 2191#elif defined(TILE) 2192 /* 2193 * The standard tile calling convention returns the value (or negative 2194 * errno) in r0, and zero (or positive errno) in r1. 2195 * Until at least kernel 3.8, however, the r1 value is not reflected 2196 * in ptregs at this point, so we use r0 here. 2197 */ 2198 if (check_errno && is_negated_errno(tile_regs.regs[0])) { 2199 tcp->u_rval = -1; 2200 u_error = -tile_regs.regs[0]; 2201 } else { 2202 tcp->u_rval = tile_regs.regs[0]; 2203 } 2204#elif defined(MICROBLAZE) 2205 if (check_errno && is_negated_errno(microblaze_r3)) { 2206 tcp->u_rval = -1; 2207 u_error = -microblaze_r3; 2208 } 2209 else { 2210 tcp->u_rval = microblaze_r3; 2211 } 2212#elif defined(OR1K) 2213 if (check_errno && is_negated_errno(or1k_regs.gpr[11])) { 2214 tcp->u_rval = -1; 2215 u_error = -or1k_regs.gpr[11]; 2216 } 2217 else { 2218 tcp->u_rval = or1k_regs.gpr[11]; 2219 } 2220#elif defined(XTENSA) 2221 if (check_errno && is_negated_errno(xtensa_a2)) { 2222 tcp->u_rval = -1; 2223 u_error = -xtensa_a2; 2224 } 2225 else { 2226 tcp->u_rval = xtensa_a2; 2227 } 2228#elif defined(ARC) 2229 if (check_errno && is_negated_errno(arc_regs.scratch.r0)) { 2230 tcp->u_rval = -1; 2231 u_error = -arc_regs.scratch.r0; 2232 } 2233 else { 2234 tcp->u_rval = arc_regs.scratch.r0; 2235 } 2236#endif 2237 tcp->u_error = u_error; 2238} 2239 2240static void 2241dumpio(struct tcb *tcp) 2242{ 2243 int (*func)(); 2244 2245 if (syserror(tcp)) 2246 return; 2247 if ((unsigned long) tcp->u_arg[0] >= num_quals) 2248 return; 2249 func = tcp->s_ent->sys_func; 2250 if (func == printargs) 2251 return; 2252 if (qual_flags[tcp->u_arg[0]] & QUAL_READ) { 2253 if (func == sys_read || 2254 func == sys_pread || 2255 func == sys_recv || 2256 func == sys_recvfrom) { 2257 dumpstr(tcp, tcp->u_arg[1], tcp->u_rval); 2258 return; 2259 } else if (func == sys_readv) { 2260 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2261 return; 2262#if HAVE_SENDMSG 2263 } else if (func == sys_recvmsg) { 2264 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2265 return; 2266 } else if (func == sys_recvmmsg) { 2267 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2268 return; 2269#endif 2270 } 2271 } 2272 if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) { 2273 if (func == sys_write || 2274 func == sys_pwrite || 2275 func == sys_send || 2276 func == sys_sendto) 2277 dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]); 2278 else if (func == sys_writev) 2279 dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]); 2280#if HAVE_SENDMSG 2281 else if (func == sys_sendmsg) 2282 dumpiov_in_msghdr(tcp, tcp->u_arg[1]); 2283 else if (func == sys_sendmmsg) 2284 dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]); 2285#endif 2286 } 2287} 2288 2289static int 2290trace_syscall_exiting(struct tcb *tcp) 2291{ 2292 int sys_res; 2293 struct timeval tv; 2294 int res; 2295 long u_error; 2296 2297 /* Measure the exit time as early as possible to avoid errors. */ 2298 if (Tflag || cflag) 2299 gettimeofday(&tv, NULL); 2300 2301#ifdef USE_LIBUNWIND 2302 if (stack_trace_enabled) { 2303 if (tcp->s_ent->sys_flags & STACKTRACE_INVALIDATE_CACHE) 2304 unwind_cache_invalidate(tcp); 2305 } 2306#endif 2307 2308#if SUPPORTED_PERSONALITIES > 1 2309 update_personality(tcp, tcp->currpers); 2310#endif 2311 res = (get_regs_error ? -1 : get_syscall_result(tcp)); 2312 if (res == 1) { 2313 get_error(tcp); /* never fails */ 2314 if (filtered(tcp) || hide_log_until_execve) 2315 goto ret; 2316 } 2317 2318 if (cflag) { 2319 count_syscall(tcp, &tv); 2320 if (cflag == CFLAG_ONLY_STATS) { 2321 goto ret; 2322 } 2323 } 2324 2325 /* If not in -ff mode, and printing_tcp != tcp, 2326 * then the log currently does not end with output 2327 * of _our syscall entry_, but with something else. 2328 * We need to say which syscall's return is this. 2329 * 2330 * Forced reprinting via TCB_REPRINT is used only by 2331 * "strace -ff -oLOG test/threaded_execve" corner case. 2332 * It's the only case when -ff mode needs reprinting. 2333 */ 2334 if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) { 2335 tcp->flags &= ~TCB_REPRINT; 2336 printleader(tcp); 2337 if (tcp->qual_flg & UNDEFINED_SCNO) 2338 tprintf("<... %s resumed> ", undefined_scno_name(tcp)); 2339 else 2340 tprintf("<... %s resumed> ", tcp->s_ent->sys_name); 2341 } 2342 printing_tcp = tcp; 2343 2344 if (res != 1) { 2345 /* There was error in one of prior ptrace ops */ 2346 tprints(") "); 2347 tabto(); 2348 tprints("= ? <unavailable>\n"); 2349 line_ended(); 2350 tcp->flags &= ~TCB_INSYSCALL; 2351 return res; 2352 } 2353 2354 sys_res = 0; 2355 if (tcp->qual_flg & QUAL_RAW) { 2356 /* sys_res = printargs(tcp); - but it's nop on sysexit */ 2357 } else { 2358 /* FIXME: not_failing_only (IOW, option -z) is broken: 2359 * failure of syscall is known only after syscall return. 2360 * Thus we end up with something like this on, say, ENOENT: 2361 * open("doesnt_exist", O_RDONLY <unfinished ...> 2362 * {next syscall decode} 2363 * whereas the intended result is that open(...) line 2364 * is not shown at all. 2365 */ 2366 if (not_failing_only && tcp->u_error) 2367 goto ret; /* ignore failed syscalls */ 2368 sys_res = tcp->s_ent->sys_func(tcp); 2369 } 2370 2371 tprints(") "); 2372 tabto(); 2373 u_error = tcp->u_error; 2374 if (tcp->qual_flg & QUAL_RAW) { 2375 if (u_error) 2376 tprintf("= -1 (errno %ld)", u_error); 2377 else 2378 tprintf("= %#lx", tcp->u_rval); 2379 } 2380 else if (!(sys_res & RVAL_NONE) && u_error) { 2381 switch (u_error) { 2382 /* Blocked signals do not interrupt any syscalls. 2383 * In this case syscalls don't return ERESTARTfoo codes. 2384 * 2385 * Deadly signals set to SIG_DFL interrupt syscalls 2386 * and kill the process regardless of which of the codes below 2387 * is returned by the interrupted syscall. 2388 * In some cases, kernel forces a kernel-generated deadly 2389 * signal to be unblocked and set to SIG_DFL (and thus cause 2390 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV 2391 * or SIGILL. (The alternative is to leave process spinning 2392 * forever on the faulty instruction - not useful). 2393 * 2394 * SIG_IGNed signals and non-deadly signals set to SIG_DFL 2395 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls, 2396 * but kernel will always restart them. 2397 */ 2398 case ERESTARTSYS: 2399 /* Most common type of signal-interrupted syscall exit code. 2400 * The system call will be restarted with the same arguments 2401 * if SA_RESTART is set; otherwise, it will fail with EINTR. 2402 */ 2403 tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)"); 2404 break; 2405 case ERESTARTNOINTR: 2406 /* Rare. For example, fork() returns this if interrupted. 2407 * SA_RESTART is ignored (assumed set): the restart is unconditional. 2408 */ 2409 tprints("= ? ERESTARTNOINTR (To be restarted)"); 2410 break; 2411 case ERESTARTNOHAND: 2412 /* pause(), rt_sigsuspend() etc use this code. 2413 * SA_RESTART is ignored (assumed not set): 2414 * syscall won't restart (will return EINTR instead) 2415 * even after signal with SA_RESTART set. However, 2416 * after SIG_IGN or SIG_DFL signal it will restart 2417 * (thus the name "restart only if has no handler"). 2418 */ 2419 tprints("= ? ERESTARTNOHAND (To be restarted if no handler)"); 2420 break; 2421 case ERESTART_RESTARTBLOCK: 2422 /* Syscalls like nanosleep(), poll() which can't be 2423 * restarted with their original arguments use this 2424 * code. Kernel will execute restart_syscall() instead, 2425 * which changes arguments before restarting syscall. 2426 * SA_RESTART is ignored (assumed not set) similarly 2427 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART 2428 * since restart data is saved in "restart block" 2429 * in task struct, and if signal handler uses a syscall 2430 * which in turn saves another such restart block, 2431 * old data is lost and restart becomes impossible) 2432 */ 2433 tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)"); 2434 break; 2435 default: 2436 if ((unsigned long) u_error < nerrnos 2437 && errnoent[u_error]) 2438 tprintf("= -1 %s (%s)", errnoent[u_error], 2439 strerror(u_error)); 2440 else 2441 tprintf("= -1 ERRNO_%lu (%s)", u_error, 2442 strerror(u_error)); 2443 break; 2444 } 2445 if ((sys_res & RVAL_STR) && tcp->auxstr) 2446 tprintf(" (%s)", tcp->auxstr); 2447 } 2448 else { 2449 if (sys_res & RVAL_NONE) 2450 tprints("= ?"); 2451 else { 2452 switch (sys_res & RVAL_MASK) { 2453 case RVAL_HEX: 2454 tprintf("= %#lx", tcp->u_rval); 2455 break; 2456 case RVAL_OCTAL: 2457 tprintf("= %#lo", tcp->u_rval); 2458 break; 2459 case RVAL_UDECIMAL: 2460 tprintf("= %lu", tcp->u_rval); 2461 break; 2462 case RVAL_DECIMAL: 2463 tprintf("= %ld", tcp->u_rval); 2464 break; 2465 case RVAL_FD: 2466 if (show_fd_path) { 2467 tprints("= "); 2468 printfd(tcp, tcp->u_rval); 2469 } 2470 else 2471 tprintf("= %ld", tcp->u_rval); 2472 break; 2473#if defined(LINUX_MIPSN32) || defined(X32) 2474 /* 2475 case RVAL_LHEX: 2476 tprintf("= %#llx", tcp->u_lrval); 2477 break; 2478 case RVAL_LOCTAL: 2479 tprintf("= %#llo", tcp->u_lrval); 2480 break; 2481 */ 2482 case RVAL_LUDECIMAL: 2483 tprintf("= %llu", tcp->u_lrval); 2484 break; 2485 /* 2486 case RVAL_LDECIMAL: 2487 tprintf("= %lld", tcp->u_lrval); 2488 break; 2489 */ 2490#endif 2491 default: 2492 fprintf(stderr, 2493 "invalid rval format\n"); 2494 break; 2495 } 2496 } 2497 if ((sys_res & RVAL_STR) && tcp->auxstr) 2498 tprintf(" (%s)", tcp->auxstr); 2499 } 2500 if (Tflag) { 2501 tv_sub(&tv, &tv, &tcp->etime); 2502 tprintf(" <%ld.%06ld>", 2503 (long) tv.tv_sec, (long) tv.tv_usec); 2504 } 2505 tprints("\n"); 2506 dumpio(tcp); 2507 line_ended(); 2508 2509#ifdef USE_LIBUNWIND 2510 if (stack_trace_enabled) 2511 unwind_print_stacktrace(tcp); 2512#endif 2513 2514 ret: 2515 tcp->flags &= ~TCB_INSYSCALL; 2516 return 0; 2517} 2518 2519int 2520trace_syscall(struct tcb *tcp) 2521{ 2522 return exiting(tcp) ? 2523 trace_syscall_exiting(tcp) : trace_syscall_entering(tcp); 2524} 2525