1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * probe-event.c : perf-probe definition to probe_events format converter 4 * 5 * Written by Masami Hiramatsu <mhiramat@redhat.com> 6 */ 7 8 #include <inttypes.h> 9 #include <sys/utsname.h> 10 #include <sys/types.h> 11 #include <sys/stat.h> 12 #include <fcntl.h> 13 #include <errno.h> 14 #include <stdio.h> 15 #include <unistd.h> 16 #include <stdlib.h> 17 #include <string.h> 18 #include <stdarg.h> 19 #include <limits.h> 20 #include <elf.h> 21 22 #include "build-id.h" 23 #include "event.h" 24 #include "namespaces.h" 25 #include "strlist.h" 26 #include "strfilter.h" 27 #include "debug.h" 28 #include "dso.h" 29 #include "color.h" 30 #include "map.h" 31 #include "maps.h" 32 #include "symbol.h" 33 #include <api/fs/fs.h> 34 #include "trace-event.h" /* For __maybe_unused */ 35 #include "probe-event.h" 36 #include "probe-finder.h" 37 #include "probe-file.h" 38 #include "session.h" 39 #include "string2.h" 40 #include "strbuf.h" 41 42 #include <subcmd/pager.h> 43 #include <linux/ctype.h> 44 #include <linux/zalloc.h> 45 46 #ifdef HAVE_DEBUGINFOD_SUPPORT 47 #include <elfutils/debuginfod.h> 48 #endif 49 50 #define PERFPROBE_GROUP "probe" 51 52 bool probe_event_dry_run; /* Dry run flag */ 53 struct probe_conf probe_conf = { .magic_num = DEFAULT_PROBE_MAGIC_NUM }; 54 55 #define semantic_error(msg ...) pr_err("Semantic error :" msg) 56 57 int e_snprintf(char *str, size_t size, const char *format, ...) 58 { 59 int ret; 60 va_list ap; 61 va_start(ap, format); 62 ret = vsnprintf(str, size, format, ap); 63 va_end(ap); 64 if (ret >= (int)size) 65 ret = -E2BIG; 66 return ret; 67 } 68 69 static struct machine *host_machine; 70 71 /* Initialize symbol maps and path of vmlinux/modules */ 72 int init_probe_symbol_maps(bool user_only) 73 { 74 int ret; 75 76 symbol_conf.sort_by_name = true; 77 symbol_conf.allow_aliases = true; 78 ret = symbol__init(NULL); 79 if (ret < 0) { 80 pr_debug("Failed to init symbol map.\n"); 81 goto out; 82 } 83 84 if (host_machine || user_only) /* already initialized */ 85 return 0; 86 87 if (symbol_conf.vmlinux_name) 88 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); 89 90 host_machine = machine__new_host(); 91 if (!host_machine) { 92 pr_debug("machine__new_host() failed.\n"); 93 symbol__exit(); 94 ret = -1; 95 } 96 out: 97 if (ret < 0) 98 pr_warning("Failed to init vmlinux path.\n"); 99 return ret; 100 } 101 102 void exit_probe_symbol_maps(void) 103 { 104 machine__delete(host_machine); 105 host_machine = NULL; 106 symbol__exit(); 107 } 108 109 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap) 110 { 111 struct kmap *kmap; 112 struct map *map = machine__kernel_map(host_machine); 113 114 if (map__load(map) < 0) 115 return NULL; 116 117 kmap = map__kmap(map); 118 if (!kmap) 119 return NULL; 120 121 if (pmap) 122 *pmap = map; 123 124 return kmap->ref_reloc_sym; 125 } 126 127 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, 128 bool reloc, bool reladdr) 129 { 130 struct ref_reloc_sym *reloc_sym; 131 struct symbol *sym; 132 struct map *map; 133 134 /* ref_reloc_sym is just a label. Need a special fix*/ 135 reloc_sym = kernel_get_ref_reloc_sym(&map); 136 if (reloc_sym && strcmp(name, reloc_sym->name) == 0) 137 *addr = (!map->reloc || reloc) ? reloc_sym->addr : 138 reloc_sym->unrelocated_addr; 139 else { 140 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map); 141 if (!sym) 142 return -ENOENT; 143 *addr = map->unmap_ip(map, sym->start) - 144 ((reloc) ? 0 : map->reloc) - 145 ((reladdr) ? map->start : 0); 146 } 147 return 0; 148 } 149 150 static struct map *kernel_get_module_map(const char *module) 151 { 152 struct maps *maps = machine__kernel_maps(host_machine); 153 struct map *pos; 154 155 /* A file path -- this is an offline module */ 156 if (module && strchr(module, '/')) 157 return dso__new_map(module); 158 159 if (!module) { 160 pos = machine__kernel_map(host_machine); 161 return map__get(pos); 162 } 163 164 maps__for_each_entry(maps, pos) { 165 /* short_name is "[module]" */ 166 if (strncmp(pos->dso->short_name + 1, module, 167 pos->dso->short_name_len - 2) == 0 && 168 module[pos->dso->short_name_len - 2] == '\0') { 169 return map__get(pos); 170 } 171 } 172 return NULL; 173 } 174 175 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) 176 { 177 /* Init maps of given executable or kernel */ 178 if (user) { 179 struct map *map; 180 181 map = dso__new_map(target); 182 if (map && map->dso) 183 map->dso->nsinfo = nsinfo__get(nsi); 184 return map; 185 } else { 186 return kernel_get_module_map(target); 187 } 188 } 189 190 static int convert_exec_to_group(const char *exec, char **result) 191 { 192 char *ptr1, *ptr2, *exec_copy; 193 char buf[64]; 194 int ret; 195 196 exec_copy = strdup(exec); 197 if (!exec_copy) 198 return -ENOMEM; 199 200 ptr1 = basename(exec_copy); 201 if (!ptr1) { 202 ret = -EINVAL; 203 goto out; 204 } 205 206 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { 207 if (!isalnum(*ptr2) && *ptr2 != '_') { 208 *ptr2 = '\0'; 209 break; 210 } 211 } 212 213 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); 214 if (ret < 0) 215 goto out; 216 217 *result = strdup(buf); 218 ret = *result ? 0 : -ENOMEM; 219 220 out: 221 free(exec_copy); 222 return ret; 223 } 224 225 static void clear_perf_probe_point(struct perf_probe_point *pp) 226 { 227 zfree(&pp->file); 228 zfree(&pp->function); 229 zfree(&pp->lazy_line); 230 } 231 232 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) 233 { 234 int i; 235 236 for (i = 0; i < ntevs; i++) 237 clear_probe_trace_event(tevs + i); 238 } 239 240 static bool kprobe_blacklist__listed(unsigned long address); 241 static bool kprobe_warn_out_range(const char *symbol, unsigned long address) 242 { 243 struct map *map; 244 bool ret = false; 245 246 map = kernel_get_module_map(NULL); 247 if (map) { 248 ret = address <= map->start || map->end < address; 249 if (ret) 250 pr_warning("%s is out of .text, skip it.\n", symbol); 251 map__put(map); 252 } 253 if (!ret && kprobe_blacklist__listed(address)) { 254 pr_warning("%s is blacklisted function, skip it.\n", symbol); 255 ret = true; 256 } 257 258 return ret; 259 } 260 261 /* 262 * @module can be module name of module file path. In case of path, 263 * inspect elf and find out what is actual module name. 264 * Caller has to free mod_name after using it. 265 */ 266 static char *find_module_name(const char *module) 267 { 268 int fd; 269 Elf *elf; 270 GElf_Ehdr ehdr; 271 GElf_Shdr shdr; 272 Elf_Data *data; 273 Elf_Scn *sec; 274 char *mod_name = NULL; 275 int name_offset; 276 277 fd = open(module, O_RDONLY); 278 if (fd < 0) 279 return NULL; 280 281 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 282 if (elf == NULL) 283 goto elf_err; 284 285 if (gelf_getehdr(elf, &ehdr) == NULL) 286 goto ret_err; 287 288 sec = elf_section_by_name(elf, &ehdr, &shdr, 289 ".gnu.linkonce.this_module", NULL); 290 if (!sec) 291 goto ret_err; 292 293 data = elf_getdata(sec, NULL); 294 if (!data || !data->d_buf) 295 goto ret_err; 296 297 /* 298 * NOTE: 299 * '.gnu.linkonce.this_module' section of kernel module elf directly 300 * maps to 'struct module' from linux/module.h. This section contains 301 * actual module name which will be used by kernel after loading it. 302 * But, we cannot use 'struct module' here since linux/module.h is not 303 * exposed to user-space. Offset of 'name' has remained same from long 304 * time, so hardcoding it here. 305 */ 306 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) 307 name_offset = 12; 308 else /* expect ELFCLASS64 by default */ 309 name_offset = 24; 310 311 mod_name = strdup((char *)data->d_buf + name_offset); 312 313 ret_err: 314 elf_end(elf); 315 elf_err: 316 close(fd); 317 return mod_name; 318 } 319 320 #ifdef HAVE_DWARF_SUPPORT 321 322 static int kernel_get_module_dso(const char *module, struct dso **pdso) 323 { 324 struct dso *dso; 325 struct map *map; 326 const char *vmlinux_name; 327 int ret = 0; 328 329 if (module) { 330 char module_name[128]; 331 332 snprintf(module_name, sizeof(module_name), "[%s]", module); 333 map = maps__find_by_name(&host_machine->kmaps, module_name); 334 if (map) { 335 dso = map->dso; 336 goto found; 337 } 338 pr_debug("Failed to find module %s.\n", module); 339 return -ENOENT; 340 } 341 342 map = machine__kernel_map(host_machine); 343 dso = map->dso; 344 if (!dso->has_build_id) 345 dso__read_running_kernel_build_id(dso, host_machine); 346 347 vmlinux_name = symbol_conf.vmlinux_name; 348 dso->load_errno = 0; 349 if (vmlinux_name) 350 ret = dso__load_vmlinux(dso, map, vmlinux_name, false); 351 else 352 ret = dso__load_vmlinux_path(dso, map); 353 found: 354 *pdso = dso; 355 return ret; 356 } 357 358 /* 359 * Some binaries like glibc have special symbols which are on the symbol 360 * table, but not in the debuginfo. If we can find the address of the 361 * symbol from map, we can translate the address back to the probe point. 362 */ 363 static int find_alternative_probe_point(struct debuginfo *dinfo, 364 struct perf_probe_point *pp, 365 struct perf_probe_point *result, 366 const char *target, struct nsinfo *nsi, 367 bool uprobes) 368 { 369 struct map *map = NULL; 370 struct symbol *sym; 371 u64 address = 0; 372 int ret = -ENOENT; 373 374 /* This can work only for function-name based one */ 375 if (!pp->function || pp->file) 376 return -ENOTSUP; 377 378 map = get_target_map(target, nsi, uprobes); 379 if (!map) 380 return -EINVAL; 381 382 /* Find the address of given function */ 383 map__for_each_symbol_by_name(map, pp->function, sym) { 384 if (uprobes) { 385 address = sym->start; 386 if (sym->type == STT_GNU_IFUNC) 387 pr_warning("Warning: The probe function (%s) is a GNU indirect function.\n" 388 "Consider identifying the final function used at run time and set the probe directly on that.\n", 389 pp->function); 390 } else 391 address = map->unmap_ip(map, sym->start) - map->reloc; 392 break; 393 } 394 if (!address) { 395 ret = -ENOENT; 396 goto out; 397 } 398 pr_debug("Symbol %s address found : %" PRIx64 "\n", 399 pp->function, address); 400 401 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, 402 result); 403 if (ret <= 0) 404 ret = (!ret) ? -ENOENT : ret; 405 else { 406 result->offset += pp->offset; 407 result->line += pp->line; 408 result->retprobe = pp->retprobe; 409 ret = 0; 410 } 411 412 out: 413 map__put(map); 414 return ret; 415 416 } 417 418 static int get_alternative_probe_event(struct debuginfo *dinfo, 419 struct perf_probe_event *pev, 420 struct perf_probe_point *tmp) 421 { 422 int ret; 423 424 memcpy(tmp, &pev->point, sizeof(*tmp)); 425 memset(&pev->point, 0, sizeof(pev->point)); 426 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, 427 pev->nsi, pev->uprobes); 428 if (ret < 0) 429 memcpy(&pev->point, tmp, sizeof(*tmp)); 430 431 return ret; 432 } 433 434 static int get_alternative_line_range(struct debuginfo *dinfo, 435 struct line_range *lr, 436 const char *target, bool user) 437 { 438 struct perf_probe_point pp = { .function = lr->function, 439 .file = lr->file, 440 .line = lr->start }; 441 struct perf_probe_point result; 442 int ret, len = 0; 443 444 memset(&result, 0, sizeof(result)); 445 446 if (lr->end != INT_MAX) 447 len = lr->end - lr->start; 448 ret = find_alternative_probe_point(dinfo, &pp, &result, 449 target, NULL, user); 450 if (!ret) { 451 lr->function = result.function; 452 lr->file = result.file; 453 lr->start = result.line; 454 if (lr->end != INT_MAX) 455 lr->end = lr->start + len; 456 clear_perf_probe_point(&pp); 457 } 458 return ret; 459 } 460 461 #ifdef HAVE_DEBUGINFOD_SUPPORT 462 static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi, 463 bool silent) 464 { 465 debuginfod_client *c = debuginfod_begin(); 466 char sbuild_id[SBUILD_ID_SIZE + 1]; 467 struct debuginfo *ret = NULL; 468 struct nscookie nsc; 469 char *path; 470 int fd; 471 472 if (!c) 473 return NULL; 474 475 build_id__sprintf(&dso->bid, sbuild_id); 476 fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id, 477 0, &path); 478 if (fd >= 0) 479 close(fd); 480 debuginfod_end(c); 481 if (fd < 0) { 482 if (!silent) 483 pr_debug("Failed to find debuginfo in debuginfod.\n"); 484 return NULL; 485 } 486 if (!silent) 487 pr_debug("Load debuginfo from debuginfod (%s)\n", path); 488 489 nsinfo__mountns_enter(nsi, &nsc); 490 ret = debuginfo__new((const char *)path); 491 nsinfo__mountns_exit(&nsc); 492 return ret; 493 } 494 #else 495 static inline 496 struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused, 497 struct nsinfo *nsi __maybe_unused, 498 bool silent __maybe_unused) 499 { 500 return NULL; 501 } 502 #endif 503 504 /* Open new debuginfo of given module */ 505 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, 506 bool silent) 507 { 508 const char *path = module; 509 char reason[STRERR_BUFSIZE]; 510 struct debuginfo *ret = NULL; 511 struct dso *dso = NULL; 512 struct nscookie nsc; 513 int err; 514 515 if (!module || !strchr(module, '/')) { 516 err = kernel_get_module_dso(module, &dso); 517 if (err < 0) { 518 if (!dso || dso->load_errno == 0) { 519 if (!str_error_r(-err, reason, STRERR_BUFSIZE)) 520 strcpy(reason, "(unknown)"); 521 } else 522 dso__strerror_load(dso, reason, STRERR_BUFSIZE); 523 if (dso) 524 ret = open_from_debuginfod(dso, nsi, silent); 525 if (ret) 526 return ret; 527 if (!silent) { 528 if (module) 529 pr_err("Module %s is not loaded, please specify its full path name.\n", module); 530 else 531 pr_err("Failed to find the path for the kernel: %s\n", reason); 532 } 533 return NULL; 534 } 535 path = dso->long_name; 536 } 537 nsinfo__mountns_enter(nsi, &nsc); 538 ret = debuginfo__new(path); 539 if (!ret && !silent) { 540 pr_warning("The %s file has no debug information.\n", path); 541 if (!module || !strtailcmp(path, ".ko")) 542 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); 543 else 544 pr_warning("Rebuild with -g, "); 545 pr_warning("or install an appropriate debuginfo package.\n"); 546 } 547 nsinfo__mountns_exit(&nsc); 548 return ret; 549 } 550 551 /* For caching the last debuginfo */ 552 static struct debuginfo *debuginfo_cache; 553 static char *debuginfo_cache_path; 554 555 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) 556 { 557 const char *path = module; 558 559 /* If the module is NULL, it should be the kernel. */ 560 if (!module) 561 path = "kernel"; 562 563 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) 564 goto out; 565 566 /* Copy module path */ 567 free(debuginfo_cache_path); 568 debuginfo_cache_path = strdup(path); 569 if (!debuginfo_cache_path) { 570 debuginfo__delete(debuginfo_cache); 571 debuginfo_cache = NULL; 572 goto out; 573 } 574 575 debuginfo_cache = open_debuginfo(module, NULL, silent); 576 if (!debuginfo_cache) 577 zfree(&debuginfo_cache_path); 578 out: 579 return debuginfo_cache; 580 } 581 582 static void debuginfo_cache__exit(void) 583 { 584 debuginfo__delete(debuginfo_cache); 585 debuginfo_cache = NULL; 586 zfree(&debuginfo_cache_path); 587 } 588 589 590 static int get_text_start_address(const char *exec, unsigned long *address, 591 struct nsinfo *nsi) 592 { 593 Elf *elf; 594 GElf_Ehdr ehdr; 595 GElf_Shdr shdr; 596 int fd, ret = -ENOENT; 597 struct nscookie nsc; 598 599 nsinfo__mountns_enter(nsi, &nsc); 600 fd = open(exec, O_RDONLY); 601 nsinfo__mountns_exit(&nsc); 602 if (fd < 0) 603 return -errno; 604 605 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 606 if (elf == NULL) { 607 ret = -EINVAL; 608 goto out_close; 609 } 610 611 if (gelf_getehdr(elf, &ehdr) == NULL) 612 goto out; 613 614 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) 615 goto out; 616 617 *address = shdr.sh_addr - shdr.sh_offset; 618 ret = 0; 619 out: 620 elf_end(elf); 621 out_close: 622 close(fd); 623 624 return ret; 625 } 626 627 /* 628 * Convert trace point to probe point with debuginfo 629 */ 630 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, 631 struct perf_probe_point *pp, 632 bool is_kprobe) 633 { 634 struct debuginfo *dinfo = NULL; 635 unsigned long stext = 0; 636 u64 addr = tp->address; 637 int ret = -ENOENT; 638 639 /* convert the address to dwarf address */ 640 if (!is_kprobe) { 641 if (!addr) { 642 ret = -EINVAL; 643 goto error; 644 } 645 ret = get_text_start_address(tp->module, &stext, NULL); 646 if (ret < 0) 647 goto error; 648 addr += stext; 649 } else if (tp->symbol) { 650 /* If the module is given, this returns relative address */ 651 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, 652 false, !!tp->module); 653 if (ret != 0) 654 goto error; 655 addr += tp->offset; 656 } 657 658 pr_debug("try to find information at %" PRIx64 " in %s\n", addr, 659 tp->module ? : "kernel"); 660 661 dinfo = debuginfo_cache__open(tp->module, verbose <= 0); 662 if (dinfo) 663 ret = debuginfo__find_probe_point(dinfo, 664 (unsigned long)addr, pp); 665 else 666 ret = -ENOENT; 667 668 if (ret > 0) { 669 pp->retprobe = tp->retprobe; 670 return 0; 671 } 672 error: 673 pr_debug("Failed to find corresponding probes from debuginfo.\n"); 674 return ret ? : -ENOENT; 675 } 676 677 /* Adjust symbol name and address */ 678 static int post_process_probe_trace_point(struct probe_trace_point *tp, 679 struct map *map, unsigned long offs) 680 { 681 struct symbol *sym; 682 u64 addr = tp->address - offs; 683 684 sym = map__find_symbol(map, addr); 685 if (!sym) { 686 /* 687 * If the address is in the inittext section, map can not 688 * find it. Ignore it if we are probing offline kernel. 689 */ 690 return (symbol_conf.ignore_vmlinux_buildid) ? 0 : -ENOENT; 691 } 692 693 if (strcmp(sym->name, tp->symbol)) { 694 /* If we have no realname, use symbol for it */ 695 if (!tp->realname) 696 tp->realname = tp->symbol; 697 else 698 free(tp->symbol); 699 tp->symbol = strdup(sym->name); 700 if (!tp->symbol) 701 return -ENOMEM; 702 } 703 tp->offset = addr - sym->start; 704 tp->address -= offs; 705 706 return 0; 707 } 708 709 /* 710 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions 711 * and generate new symbols with suffixes such as .constprop.N or .isra.N 712 * etc. Since those symbols are not recorded in DWARF, we have to find 713 * correct generated symbols from offline ELF binary. 714 * For online kernel or uprobes we don't need this because those are 715 * rebased on _text, or already a section relative address. 716 */ 717 static int 718 post_process_offline_probe_trace_events(struct probe_trace_event *tevs, 719 int ntevs, const char *pathname) 720 { 721 struct map *map; 722 unsigned long stext = 0; 723 int i, ret = 0; 724 725 /* Prepare a map for offline binary */ 726 map = dso__new_map(pathname); 727 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) { 728 pr_warning("Failed to get ELF symbols for %s\n", pathname); 729 return -EINVAL; 730 } 731 732 for (i = 0; i < ntevs; i++) { 733 ret = post_process_probe_trace_point(&tevs[i].point, 734 map, stext); 735 if (ret < 0) 736 break; 737 } 738 map__put(map); 739 740 return ret; 741 } 742 743 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, 744 int ntevs, const char *exec, 745 struct nsinfo *nsi) 746 { 747 int i, ret = 0; 748 unsigned long stext = 0; 749 750 if (!exec) 751 return 0; 752 753 ret = get_text_start_address(exec, &stext, nsi); 754 if (ret < 0) 755 return ret; 756 757 for (i = 0; i < ntevs && ret >= 0; i++) { 758 /* point.address is the address of point.symbol + point.offset */ 759 tevs[i].point.address -= stext; 760 tevs[i].point.module = strdup(exec); 761 if (!tevs[i].point.module) { 762 ret = -ENOMEM; 763 break; 764 } 765 tevs[i].uprobes = true; 766 } 767 768 return ret; 769 } 770 771 static int 772 post_process_module_probe_trace_events(struct probe_trace_event *tevs, 773 int ntevs, const char *module, 774 struct debuginfo *dinfo) 775 { 776 Dwarf_Addr text_offs = 0; 777 int i, ret = 0; 778 char *mod_name = NULL; 779 struct map *map; 780 781 if (!module) 782 return 0; 783 784 map = get_target_map(module, NULL, false); 785 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) { 786 pr_warning("Failed to get ELF symbols for %s\n", module); 787 return -EINVAL; 788 } 789 790 mod_name = find_module_name(module); 791 for (i = 0; i < ntevs; i++) { 792 ret = post_process_probe_trace_point(&tevs[i].point, 793 map, (unsigned long)text_offs); 794 if (ret < 0) 795 break; 796 tevs[i].point.module = 797 strdup(mod_name ? mod_name : module); 798 if (!tevs[i].point.module) { 799 ret = -ENOMEM; 800 break; 801 } 802 } 803 804 free(mod_name); 805 map__put(map); 806 807 return ret; 808 } 809 810 static int 811 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, 812 int ntevs) 813 { 814 struct ref_reloc_sym *reloc_sym; 815 struct map *map; 816 char *tmp; 817 int i, skipped = 0; 818 819 /* Skip post process if the target is an offline kernel */ 820 if (symbol_conf.ignore_vmlinux_buildid) 821 return post_process_offline_probe_trace_events(tevs, ntevs, 822 symbol_conf.vmlinux_name); 823 824 reloc_sym = kernel_get_ref_reloc_sym(&map); 825 if (!reloc_sym) { 826 pr_warning("Relocated base symbol is not found! " 827 "Check /proc/sys/kernel/kptr_restrict\n" 828 "and /proc/sys/kernel/perf_event_paranoid. " 829 "Or run as privileged perf user.\n\n"); 830 return -EINVAL; 831 } 832 833 for (i = 0; i < ntevs; i++) { 834 if (!tevs[i].point.address) 835 continue; 836 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported()) 837 continue; 838 /* 839 * If we found a wrong one, mark it by NULL symbol. 840 * Since addresses in debuginfo is same as objdump, we need 841 * to convert it to addresses on memory. 842 */ 843 if (kprobe_warn_out_range(tevs[i].point.symbol, 844 map__objdump_2mem(map, tevs[i].point.address))) { 845 tmp = NULL; 846 skipped++; 847 } else { 848 tmp = strdup(reloc_sym->name); 849 if (!tmp) 850 return -ENOMEM; 851 } 852 /* If we have no realname, use symbol for it */ 853 if (!tevs[i].point.realname) 854 tevs[i].point.realname = tevs[i].point.symbol; 855 else 856 free(tevs[i].point.symbol); 857 tevs[i].point.symbol = tmp; 858 tevs[i].point.offset = tevs[i].point.address - 859 (map->reloc ? reloc_sym->unrelocated_addr : 860 reloc_sym->addr); 861 } 862 return skipped; 863 } 864 865 void __weak 866 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, 867 int ntevs __maybe_unused) 868 { 869 } 870 871 /* Post processing the probe events */ 872 static int post_process_probe_trace_events(struct perf_probe_event *pev, 873 struct probe_trace_event *tevs, 874 int ntevs, const char *module, 875 bool uprobe, struct debuginfo *dinfo) 876 { 877 int ret; 878 879 if (uprobe) 880 ret = add_exec_to_probe_trace_events(tevs, ntevs, module, 881 pev->nsi); 882 else if (module) 883 /* Currently ref_reloc_sym based probe is not for drivers */ 884 ret = post_process_module_probe_trace_events(tevs, ntevs, 885 module, dinfo); 886 else 887 ret = post_process_kernel_probe_trace_events(tevs, ntevs); 888 889 if (ret >= 0) 890 arch__post_process_probe_trace_events(pev, ntevs); 891 892 return ret; 893 } 894 895 /* Try to find perf_probe_event with debuginfo */ 896 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 897 struct probe_trace_event **tevs) 898 { 899 bool need_dwarf = perf_probe_event_need_dwarf(pev); 900 struct perf_probe_point tmp; 901 struct debuginfo *dinfo; 902 int ntevs, ret = 0; 903 904 /* Workaround for gcc #98776 issue. 905 * Perf failed to add kretprobe event with debuginfo of vmlinux which is 906 * compiled by gcc with -fpatchable-function-entry option enabled. The 907 * same issue with kernel module. The retprobe doesn`t need debuginfo. 908 * This workaround solution use map to query the probe function address 909 * for retprobe event. 910 */ 911 if (pev->point.retprobe) 912 return 0; 913 914 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf); 915 if (!dinfo) { 916 if (need_dwarf) 917 return -ENOENT; 918 pr_debug("Could not open debuginfo. Try to use symbols.\n"); 919 return 0; 920 } 921 922 pr_debug("Try to find probe point from debuginfo.\n"); 923 /* Searching trace events corresponding to a probe event */ 924 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 925 926 if (ntevs == 0) { /* Not found, retry with an alternative */ 927 ret = get_alternative_probe_event(dinfo, pev, &tmp); 928 if (!ret) { 929 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 930 /* 931 * Write back to the original probe_event for 932 * setting appropriate (user given) event name 933 */ 934 clear_perf_probe_point(&pev->point); 935 memcpy(&pev->point, &tmp, sizeof(tmp)); 936 } 937 } 938 939 if (ntevs > 0) { /* Succeeded to find trace events */ 940 pr_debug("Found %d probe_trace_events.\n", ntevs); 941 ret = post_process_probe_trace_events(pev, *tevs, ntevs, 942 pev->target, pev->uprobes, dinfo); 943 if (ret < 0 || ret == ntevs) { 944 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret); 945 clear_probe_trace_events(*tevs, ntevs); 946 zfree(tevs); 947 ntevs = 0; 948 } 949 } 950 951 debuginfo__delete(dinfo); 952 953 if (ntevs == 0) { /* No error but failed to find probe point. */ 954 pr_warning("Probe point '%s' not found.\n", 955 synthesize_perf_probe_point(&pev->point)); 956 return -ENOENT; 957 } else if (ntevs < 0) { 958 /* Error path : ntevs < 0 */ 959 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); 960 if (ntevs == -EBADF) 961 pr_warning("Warning: No dwarf info found in the vmlinux - " 962 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); 963 if (!need_dwarf) { 964 pr_debug("Trying to use symbols.\n"); 965 return 0; 966 } 967 } 968 return ntevs; 969 } 970 971 #define LINEBUF_SIZE 256 972 #define NR_ADDITIONAL_LINES 2 973 974 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) 975 { 976 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; 977 const char *color = show_num ? "" : PERF_COLOR_BLUE; 978 const char *prefix = NULL; 979 980 do { 981 if (fgets(buf, LINEBUF_SIZE, fp) == NULL) 982 goto error; 983 if (skip) 984 continue; 985 if (!prefix) { 986 prefix = show_num ? "%7d " : " "; 987 color_fprintf(stdout, color, prefix, l); 988 } 989 color_fprintf(stdout, color, "%s", buf); 990 991 } while (strchr(buf, '\n') == NULL); 992 993 return 1; 994 error: 995 if (ferror(fp)) { 996 pr_warning("File read error: %s\n", 997 str_error_r(errno, sbuf, sizeof(sbuf))); 998 return -1; 999 } 1000 return 0; 1001 } 1002 1003 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) 1004 { 1005 int rv = __show_one_line(fp, l, skip, show_num); 1006 if (rv == 0) { 1007 pr_warning("Source file is shorter than expected.\n"); 1008 rv = -1; 1009 } 1010 return rv; 1011 } 1012 1013 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) 1014 #define show_one_line(f,l) _show_one_line(f,l,false,false) 1015 #define skip_one_line(f,l) _show_one_line(f,l,true,false) 1016 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) 1017 1018 /* 1019 * Show line-range always requires debuginfo to find source file and 1020 * line number. 1021 */ 1022 static int __show_line_range(struct line_range *lr, const char *module, 1023 bool user) 1024 { 1025 struct build_id bid; 1026 int l = 1; 1027 struct int_node *ln; 1028 struct debuginfo *dinfo; 1029 FILE *fp; 1030 int ret; 1031 char *tmp; 1032 char sbuf[STRERR_BUFSIZE]; 1033 char sbuild_id[SBUILD_ID_SIZE] = ""; 1034 1035 /* Search a line range */ 1036 dinfo = open_debuginfo(module, NULL, false); 1037 if (!dinfo) 1038 return -ENOENT; 1039 1040 ret = debuginfo__find_line_range(dinfo, lr); 1041 if (!ret) { /* Not found, retry with an alternative */ 1042 ret = get_alternative_line_range(dinfo, lr, module, user); 1043 if (!ret) 1044 ret = debuginfo__find_line_range(dinfo, lr); 1045 } 1046 if (dinfo->build_id) { 1047 build_id__init(&bid, dinfo->build_id, BUILD_ID_SIZE); 1048 build_id__sprintf(&bid, sbuild_id); 1049 } 1050 debuginfo__delete(dinfo); 1051 if (ret == 0 || ret == -ENOENT) { 1052 pr_warning("Specified source line is not found.\n"); 1053 return -ENOENT; 1054 } else if (ret < 0) { 1055 pr_warning("Debuginfo analysis failed.\n"); 1056 return ret; 1057 } 1058 1059 /* Convert source file path */ 1060 tmp = lr->path; 1061 ret = find_source_path(tmp, sbuild_id, lr->comp_dir, &lr->path); 1062 1063 /* Free old path when new path is assigned */ 1064 if (tmp != lr->path) 1065 free(tmp); 1066 1067 if (ret < 0) { 1068 pr_warning("Failed to find source file path.\n"); 1069 return ret; 1070 } 1071 1072 setup_pager(); 1073 1074 if (lr->function) 1075 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, 1076 lr->start - lr->offset); 1077 else 1078 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); 1079 1080 fp = fopen(lr->path, "r"); 1081 if (fp == NULL) { 1082 pr_warning("Failed to open %s: %s\n", lr->path, 1083 str_error_r(errno, sbuf, sizeof(sbuf))); 1084 return -errno; 1085 } 1086 /* Skip to starting line number */ 1087 while (l < lr->start) { 1088 ret = skip_one_line(fp, l++); 1089 if (ret < 0) 1090 goto end; 1091 } 1092 1093 intlist__for_each_entry(ln, lr->line_list) { 1094 for (; ln->i > (unsigned long)l; l++) { 1095 ret = show_one_line(fp, l - lr->offset); 1096 if (ret < 0) 1097 goto end; 1098 } 1099 ret = show_one_line_with_num(fp, l++ - lr->offset); 1100 if (ret < 0) 1101 goto end; 1102 } 1103 1104 if (lr->end == INT_MAX) 1105 lr->end = l + NR_ADDITIONAL_LINES; 1106 while (l <= lr->end) { 1107 ret = show_one_line_or_eof(fp, l++ - lr->offset); 1108 if (ret <= 0) 1109 break; 1110 } 1111 end: 1112 fclose(fp); 1113 return ret; 1114 } 1115 1116 int show_line_range(struct line_range *lr, const char *module, 1117 struct nsinfo *nsi, bool user) 1118 { 1119 int ret; 1120 struct nscookie nsc; 1121 1122 ret = init_probe_symbol_maps(user); 1123 if (ret < 0) 1124 return ret; 1125 nsinfo__mountns_enter(nsi, &nsc); 1126 ret = __show_line_range(lr, module, user); 1127 nsinfo__mountns_exit(&nsc); 1128 exit_probe_symbol_maps(); 1129 1130 return ret; 1131 } 1132 1133 static int show_available_vars_at(struct debuginfo *dinfo, 1134 struct perf_probe_event *pev, 1135 struct strfilter *_filter) 1136 { 1137 char *buf; 1138 int ret, i, nvars; 1139 struct str_node *node; 1140 struct variable_list *vls = NULL, *vl; 1141 struct perf_probe_point tmp; 1142 const char *var; 1143 1144 buf = synthesize_perf_probe_point(&pev->point); 1145 if (!buf) 1146 return -EINVAL; 1147 pr_debug("Searching variables at %s\n", buf); 1148 1149 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); 1150 if (!ret) { /* Not found, retry with an alternative */ 1151 ret = get_alternative_probe_event(dinfo, pev, &tmp); 1152 if (!ret) { 1153 ret = debuginfo__find_available_vars_at(dinfo, pev, 1154 &vls); 1155 /* Release the old probe_point */ 1156 clear_perf_probe_point(&tmp); 1157 } 1158 } 1159 if (ret <= 0) { 1160 if (ret == 0 || ret == -ENOENT) { 1161 pr_err("Failed to find the address of %s\n", buf); 1162 ret = -ENOENT; 1163 } else 1164 pr_warning("Debuginfo analysis failed.\n"); 1165 goto end; 1166 } 1167 1168 /* Some variables are found */ 1169 fprintf(stdout, "Available variables at %s\n", buf); 1170 for (i = 0; i < ret; i++) { 1171 vl = &vls[i]; 1172 /* 1173 * A probe point might be converted to 1174 * several trace points. 1175 */ 1176 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, 1177 vl->point.offset); 1178 zfree(&vl->point.symbol); 1179 nvars = 0; 1180 if (vl->vars) { 1181 strlist__for_each_entry(node, vl->vars) { 1182 var = strchr(node->s, '\t') + 1; 1183 if (strfilter__compare(_filter, var)) { 1184 fprintf(stdout, "\t\t%s\n", node->s); 1185 nvars++; 1186 } 1187 } 1188 strlist__delete(vl->vars); 1189 } 1190 if (nvars == 0) 1191 fprintf(stdout, "\t\t(No matched variables)\n"); 1192 } 1193 free(vls); 1194 end: 1195 free(buf); 1196 return ret; 1197 } 1198 1199 /* Show available variables on given probe point */ 1200 int show_available_vars(struct perf_probe_event *pevs, int npevs, 1201 struct strfilter *_filter) 1202 { 1203 int i, ret = 0; 1204 struct debuginfo *dinfo; 1205 1206 ret = init_probe_symbol_maps(pevs->uprobes); 1207 if (ret < 0) 1208 return ret; 1209 1210 dinfo = open_debuginfo(pevs->target, pevs->nsi, false); 1211 if (!dinfo) { 1212 ret = -ENOENT; 1213 goto out; 1214 } 1215 1216 setup_pager(); 1217 1218 for (i = 0; i < npevs && ret >= 0; i++) 1219 ret = show_available_vars_at(dinfo, &pevs[i], _filter); 1220 1221 debuginfo__delete(dinfo); 1222 out: 1223 exit_probe_symbol_maps(); 1224 return ret; 1225 } 1226 1227 #else /* !HAVE_DWARF_SUPPORT */ 1228 1229 static void debuginfo_cache__exit(void) 1230 { 1231 } 1232 1233 static int 1234 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, 1235 struct perf_probe_point *pp __maybe_unused, 1236 bool is_kprobe __maybe_unused) 1237 { 1238 return -ENOSYS; 1239 } 1240 1241 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 1242 struct probe_trace_event **tevs __maybe_unused) 1243 { 1244 if (perf_probe_event_need_dwarf(pev)) { 1245 pr_warning("Debuginfo-analysis is not supported.\n"); 1246 return -ENOSYS; 1247 } 1248 1249 return 0; 1250 } 1251 1252 int show_line_range(struct line_range *lr __maybe_unused, 1253 const char *module __maybe_unused, 1254 struct nsinfo *nsi __maybe_unused, 1255 bool user __maybe_unused) 1256 { 1257 pr_warning("Debuginfo-analysis is not supported.\n"); 1258 return -ENOSYS; 1259 } 1260 1261 int show_available_vars(struct perf_probe_event *pevs __maybe_unused, 1262 int npevs __maybe_unused, 1263 struct strfilter *filter __maybe_unused) 1264 { 1265 pr_warning("Debuginfo-analysis is not supported.\n"); 1266 return -ENOSYS; 1267 } 1268 #endif 1269 1270 void line_range__clear(struct line_range *lr) 1271 { 1272 zfree(&lr->function); 1273 zfree(&lr->file); 1274 zfree(&lr->path); 1275 zfree(&lr->comp_dir); 1276 intlist__delete(lr->line_list); 1277 } 1278 1279 int line_range__init(struct line_range *lr) 1280 { 1281 memset(lr, 0, sizeof(*lr)); 1282 lr->line_list = intlist__new(NULL); 1283 if (!lr->line_list) 1284 return -ENOMEM; 1285 else 1286 return 0; 1287 } 1288 1289 static int parse_line_num(char **ptr, int *val, const char *what) 1290 { 1291 const char *start = *ptr; 1292 1293 errno = 0; 1294 *val = strtol(*ptr, ptr, 0); 1295 if (errno || *ptr == start) { 1296 semantic_error("'%s' is not a valid number.\n", what); 1297 return -EINVAL; 1298 } 1299 return 0; 1300 } 1301 1302 /* Check the name is good for event, group or function */ 1303 static bool is_c_func_name(const char *name) 1304 { 1305 if (!isalpha(*name) && *name != '_') 1306 return false; 1307 while (*++name != '\0') { 1308 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1309 return false; 1310 } 1311 return true; 1312 } 1313 1314 /* 1315 * Stuff 'lr' according to the line range described by 'arg'. 1316 * The line range syntax is described by: 1317 * 1318 * SRC[:SLN[+NUM|-ELN]] 1319 * FNC[@SRC][:SLN[+NUM|-ELN]] 1320 */ 1321 int parse_line_range_desc(const char *arg, struct line_range *lr) 1322 { 1323 char *range, *file, *name = strdup(arg); 1324 int err; 1325 1326 if (!name) 1327 return -ENOMEM; 1328 1329 lr->start = 0; 1330 lr->end = INT_MAX; 1331 1332 range = strchr(name, ':'); 1333 if (range) { 1334 *range++ = '\0'; 1335 1336 err = parse_line_num(&range, &lr->start, "start line"); 1337 if (err) 1338 goto err; 1339 1340 if (*range == '+' || *range == '-') { 1341 const char c = *range++; 1342 1343 err = parse_line_num(&range, &lr->end, "end line"); 1344 if (err) 1345 goto err; 1346 1347 if (c == '+') { 1348 lr->end += lr->start; 1349 /* 1350 * Adjust the number of lines here. 1351 * If the number of lines == 1, the 1352 * the end of line should be equal to 1353 * the start of line. 1354 */ 1355 lr->end--; 1356 } 1357 } 1358 1359 pr_debug("Line range is %d to %d\n", lr->start, lr->end); 1360 1361 err = -EINVAL; 1362 if (lr->start > lr->end) { 1363 semantic_error("Start line must be smaller" 1364 " than end line.\n"); 1365 goto err; 1366 } 1367 if (*range != '\0') { 1368 semantic_error("Tailing with invalid str '%s'.\n", range); 1369 goto err; 1370 } 1371 } 1372 1373 file = strchr(name, '@'); 1374 if (file) { 1375 *file = '\0'; 1376 lr->file = strdup(++file); 1377 if (lr->file == NULL) { 1378 err = -ENOMEM; 1379 goto err; 1380 } 1381 lr->function = name; 1382 } else if (strchr(name, '/') || strchr(name, '.')) 1383 lr->file = name; 1384 else if (is_c_func_name(name))/* We reuse it for checking funcname */ 1385 lr->function = name; 1386 else { /* Invalid name */ 1387 semantic_error("'%s' is not a valid function name.\n", name); 1388 err = -EINVAL; 1389 goto err; 1390 } 1391 1392 return 0; 1393 err: 1394 free(name); 1395 return err; 1396 } 1397 1398 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) 1399 { 1400 char *ptr; 1401 1402 ptr = strpbrk_esc(*arg, ":"); 1403 if (ptr) { 1404 *ptr = '\0'; 1405 if (!pev->sdt && !is_c_func_name(*arg)) 1406 goto ng_name; 1407 pev->group = strdup_esc(*arg); 1408 if (!pev->group) 1409 return -ENOMEM; 1410 *arg = ptr + 1; 1411 } else 1412 pev->group = NULL; 1413 1414 pev->event = strdup_esc(*arg); 1415 if (pev->event == NULL) 1416 return -ENOMEM; 1417 1418 if (!pev->sdt && !is_c_func_name(pev->event)) { 1419 zfree(&pev->event); 1420 ng_name: 1421 zfree(&pev->group); 1422 semantic_error("%s is bad for event name -it must " 1423 "follow C symbol-naming rule.\n", *arg); 1424 return -EINVAL; 1425 } 1426 return 0; 1427 } 1428 1429 /* Parse probepoint definition. */ 1430 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) 1431 { 1432 struct perf_probe_point *pp = &pev->point; 1433 char *ptr, *tmp; 1434 char c, nc = 0; 1435 bool file_spec = false; 1436 int ret; 1437 1438 /* 1439 * <Syntax> 1440 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] 1441 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] 1442 * perf probe %[GRP:]SDT_EVENT 1443 */ 1444 if (!arg) 1445 return -EINVAL; 1446 1447 if (is_sdt_event(arg)) { 1448 pev->sdt = true; 1449 if (arg[0] == '%') 1450 arg++; 1451 } 1452 1453 ptr = strpbrk_esc(arg, ";=@+%"); 1454 if (pev->sdt) { 1455 if (ptr) { 1456 if (*ptr != '@') { 1457 semantic_error("%s must be an SDT name.\n", 1458 arg); 1459 return -EINVAL; 1460 } 1461 /* This must be a target file name or build id */ 1462 tmp = build_id_cache__complement(ptr + 1); 1463 if (tmp) { 1464 pev->target = build_id_cache__origname(tmp); 1465 free(tmp); 1466 } else 1467 pev->target = strdup_esc(ptr + 1); 1468 if (!pev->target) 1469 return -ENOMEM; 1470 *ptr = '\0'; 1471 } 1472 ret = parse_perf_probe_event_name(&arg, pev); 1473 if (ret == 0) { 1474 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) 1475 ret = -errno; 1476 } 1477 return ret; 1478 } 1479 1480 if (ptr && *ptr == '=') { /* Event name */ 1481 *ptr = '\0'; 1482 tmp = ptr + 1; 1483 ret = parse_perf_probe_event_name(&arg, pev); 1484 if (ret < 0) 1485 return ret; 1486 1487 arg = tmp; 1488 } 1489 1490 /* 1491 * Check arg is function or file name and copy it. 1492 * 1493 * We consider arg to be a file spec if and only if it satisfies 1494 * all of the below criteria:: 1495 * - it does not include any of "+@%", 1496 * - it includes one of ":;", and 1497 * - it has a period '.' in the name. 1498 * 1499 * Otherwise, we consider arg to be a function specification. 1500 */ 1501 if (!strpbrk_esc(arg, "+@%")) { 1502 ptr = strpbrk_esc(arg, ";:"); 1503 /* This is a file spec if it includes a '.' before ; or : */ 1504 if (ptr && memchr(arg, '.', ptr - arg)) 1505 file_spec = true; 1506 } 1507 1508 ptr = strpbrk_esc(arg, ";:+@%"); 1509 if (ptr) { 1510 nc = *ptr; 1511 *ptr++ = '\0'; 1512 } 1513 1514 if (arg[0] == '\0') 1515 tmp = NULL; 1516 else { 1517 tmp = strdup_esc(arg); 1518 if (tmp == NULL) 1519 return -ENOMEM; 1520 } 1521 1522 if (file_spec) 1523 pp->file = tmp; 1524 else { 1525 pp->function = tmp; 1526 1527 /* 1528 * Keep pp->function even if this is absolute address, 1529 * so it can mark whether abs_address is valid. 1530 * Which make 'perf probe lib.bin 0x0' possible. 1531 * 1532 * Note that checking length of tmp is not needed 1533 * because when we access tmp[1] we know tmp[0] is '0', 1534 * so tmp[1] should always valid (but could be '\0'). 1535 */ 1536 if (tmp && !strncmp(tmp, "0x", 2)) { 1537 pp->abs_address = strtoul(pp->function, &tmp, 0); 1538 if (*tmp != '\0') { 1539 semantic_error("Invalid absolute address.\n"); 1540 return -EINVAL; 1541 } 1542 } 1543 } 1544 1545 /* Parse other options */ 1546 while (ptr) { 1547 arg = ptr; 1548 c = nc; 1549 if (c == ';') { /* Lazy pattern must be the last part */ 1550 pp->lazy_line = strdup(arg); /* let leave escapes */ 1551 if (pp->lazy_line == NULL) 1552 return -ENOMEM; 1553 break; 1554 } 1555 ptr = strpbrk_esc(arg, ";:+@%"); 1556 if (ptr) { 1557 nc = *ptr; 1558 *ptr++ = '\0'; 1559 } 1560 switch (c) { 1561 case ':': /* Line number */ 1562 pp->line = strtoul(arg, &tmp, 0); 1563 if (*tmp != '\0') { 1564 semantic_error("There is non-digit char" 1565 " in line number.\n"); 1566 return -EINVAL; 1567 } 1568 break; 1569 case '+': /* Byte offset from a symbol */ 1570 pp->offset = strtoul(arg, &tmp, 0); 1571 if (*tmp != '\0') { 1572 semantic_error("There is non-digit character" 1573 " in offset.\n"); 1574 return -EINVAL; 1575 } 1576 break; 1577 case '@': /* File name */ 1578 if (pp->file) { 1579 semantic_error("SRC@SRC is not allowed.\n"); 1580 return -EINVAL; 1581 } 1582 pp->file = strdup_esc(arg); 1583 if (pp->file == NULL) 1584 return -ENOMEM; 1585 break; 1586 case '%': /* Probe places */ 1587 if (strcmp(arg, "return") == 0) { 1588 pp->retprobe = 1; 1589 } else { /* Others not supported yet */ 1590 semantic_error("%%%s is not supported.\n", arg); 1591 return -ENOTSUP; 1592 } 1593 break; 1594 default: /* Buggy case */ 1595 pr_err("This program has a bug at %s:%d.\n", 1596 __FILE__, __LINE__); 1597 return -ENOTSUP; 1598 break; 1599 } 1600 } 1601 1602 /* Exclusion check */ 1603 if (pp->lazy_line && pp->line) { 1604 semantic_error("Lazy pattern can't be used with" 1605 " line number.\n"); 1606 return -EINVAL; 1607 } 1608 1609 if (pp->lazy_line && pp->offset) { 1610 semantic_error("Lazy pattern can't be used with offset.\n"); 1611 return -EINVAL; 1612 } 1613 1614 if (pp->line && pp->offset) { 1615 semantic_error("Offset can't be used with line number.\n"); 1616 return -EINVAL; 1617 } 1618 1619 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { 1620 semantic_error("File always requires line number or " 1621 "lazy pattern.\n"); 1622 return -EINVAL; 1623 } 1624 1625 if (pp->offset && !pp->function) { 1626 semantic_error("Offset requires an entry function.\n"); 1627 return -EINVAL; 1628 } 1629 1630 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { 1631 semantic_error("Offset/Line/Lazy pattern can't be used with " 1632 "return probe.\n"); 1633 return -EINVAL; 1634 } 1635 1636 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", 1637 pp->function, pp->file, pp->line, pp->offset, pp->retprobe, 1638 pp->lazy_line); 1639 return 0; 1640 } 1641 1642 /* Parse perf-probe event argument */ 1643 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) 1644 { 1645 char *tmp, *goodname; 1646 struct perf_probe_arg_field **fieldp; 1647 1648 pr_debug("parsing arg: %s into ", str); 1649 1650 tmp = strchr(str, '='); 1651 if (tmp) { 1652 arg->name = strndup(str, tmp - str); 1653 if (arg->name == NULL) 1654 return -ENOMEM; 1655 pr_debug("name:%s ", arg->name); 1656 str = tmp + 1; 1657 } 1658 1659 tmp = strchr(str, '@'); 1660 if (tmp && tmp != str && !strcmp(tmp + 1, "user")) { /* user attr */ 1661 if (!user_access_is_supported()) { 1662 semantic_error("ftrace does not support user access\n"); 1663 return -EINVAL; 1664 } 1665 *tmp = '\0'; 1666 arg->user_access = true; 1667 pr_debug("user_access "); 1668 } 1669 1670 tmp = strchr(str, ':'); 1671 if (tmp) { /* Type setting */ 1672 *tmp = '\0'; 1673 arg->type = strdup(tmp + 1); 1674 if (arg->type == NULL) 1675 return -ENOMEM; 1676 pr_debug("type:%s ", arg->type); 1677 } 1678 1679 tmp = strpbrk(str, "-.["); 1680 if (!is_c_varname(str) || !tmp) { 1681 /* A variable, register, symbol or special value */ 1682 arg->var = strdup(str); 1683 if (arg->var == NULL) 1684 return -ENOMEM; 1685 pr_debug("%s\n", arg->var); 1686 return 0; 1687 } 1688 1689 /* Structure fields or array element */ 1690 arg->var = strndup(str, tmp - str); 1691 if (arg->var == NULL) 1692 return -ENOMEM; 1693 goodname = arg->var; 1694 pr_debug("%s, ", arg->var); 1695 fieldp = &arg->field; 1696 1697 do { 1698 *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); 1699 if (*fieldp == NULL) 1700 return -ENOMEM; 1701 if (*tmp == '[') { /* Array */ 1702 str = tmp; 1703 (*fieldp)->index = strtol(str + 1, &tmp, 0); 1704 (*fieldp)->ref = true; 1705 if (*tmp != ']' || tmp == str + 1) { 1706 semantic_error("Array index must be a" 1707 " number.\n"); 1708 return -EINVAL; 1709 } 1710 tmp++; 1711 if (*tmp == '\0') 1712 tmp = NULL; 1713 } else { /* Structure */ 1714 if (*tmp == '.') { 1715 str = tmp + 1; 1716 (*fieldp)->ref = false; 1717 } else if (tmp[1] == '>') { 1718 str = tmp + 2; 1719 (*fieldp)->ref = true; 1720 } else { 1721 semantic_error("Argument parse error: %s\n", 1722 str); 1723 return -EINVAL; 1724 } 1725 tmp = strpbrk(str, "-.["); 1726 } 1727 if (tmp) { 1728 (*fieldp)->name = strndup(str, tmp - str); 1729 if ((*fieldp)->name == NULL) 1730 return -ENOMEM; 1731 if (*str != '[') 1732 goodname = (*fieldp)->name; 1733 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); 1734 fieldp = &(*fieldp)->next; 1735 } 1736 } while (tmp); 1737 (*fieldp)->name = strdup(str); 1738 if ((*fieldp)->name == NULL) 1739 return -ENOMEM; 1740 if (*str != '[') 1741 goodname = (*fieldp)->name; 1742 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); 1743 1744 /* If no name is specified, set the last field name (not array index)*/ 1745 if (!arg->name) { 1746 arg->name = strdup(goodname); 1747 if (arg->name == NULL) 1748 return -ENOMEM; 1749 } 1750 return 0; 1751 } 1752 1753 /* Parse perf-probe event command */ 1754 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) 1755 { 1756 char **argv; 1757 int argc, i, ret = 0; 1758 1759 argv = argv_split(cmd, &argc); 1760 if (!argv) { 1761 pr_debug("Failed to split arguments.\n"); 1762 return -ENOMEM; 1763 } 1764 if (argc - 1 > MAX_PROBE_ARGS) { 1765 semantic_error("Too many probe arguments (%d).\n", argc - 1); 1766 ret = -ERANGE; 1767 goto out; 1768 } 1769 /* Parse probe point */ 1770 ret = parse_perf_probe_point(argv[0], pev); 1771 if (ret < 0) 1772 goto out; 1773 1774 /* Generate event name if needed */ 1775 if (!pev->event && pev->point.function && pev->point.line 1776 && !pev->point.lazy_line && !pev->point.offset) { 1777 if (asprintf(&pev->event, "%s_L%d", pev->point.function, 1778 pev->point.line) < 0) 1779 return -ENOMEM; 1780 } 1781 1782 /* Copy arguments and ensure return probe has no C argument */ 1783 pev->nargs = argc - 1; 1784 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 1785 if (pev->args == NULL) { 1786 ret = -ENOMEM; 1787 goto out; 1788 } 1789 for (i = 0; i < pev->nargs && ret >= 0; i++) { 1790 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); 1791 if (ret >= 0 && 1792 is_c_varname(pev->args[i].var) && pev->point.retprobe) { 1793 semantic_error("You can't specify local variable for" 1794 " kretprobe.\n"); 1795 ret = -EINVAL; 1796 } 1797 } 1798 out: 1799 argv_free(argv); 1800 1801 return ret; 1802 } 1803 1804 /* Returns true if *any* ARG is either C variable, $params or $vars. */ 1805 bool perf_probe_with_var(struct perf_probe_event *pev) 1806 { 1807 int i = 0; 1808 1809 for (i = 0; i < pev->nargs; i++) 1810 if (is_c_varname(pev->args[i].var) || 1811 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || 1812 !strcmp(pev->args[i].var, PROBE_ARG_VARS)) 1813 return true; 1814 return false; 1815 } 1816 1817 /* Return true if this perf_probe_event requires debuginfo */ 1818 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) 1819 { 1820 if (pev->point.file || pev->point.line || pev->point.lazy_line) 1821 return true; 1822 1823 if (perf_probe_with_var(pev)) 1824 return true; 1825 1826 return false; 1827 } 1828 1829 /* Parse probe_events event into struct probe_point */ 1830 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) 1831 { 1832 struct probe_trace_point *tp = &tev->point; 1833 char pr; 1834 char *p; 1835 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; 1836 int ret, i, argc; 1837 char **argv; 1838 1839 pr_debug("Parsing probe_events: %s\n", cmd); 1840 argv = argv_split(cmd, &argc); 1841 if (!argv) { 1842 pr_debug("Failed to split arguments.\n"); 1843 return -ENOMEM; 1844 } 1845 if (argc < 2) { 1846 semantic_error("Too few probe arguments.\n"); 1847 ret = -ERANGE; 1848 goto out; 1849 } 1850 1851 /* Scan event and group name. */ 1852 argv0_str = strdup(argv[0]); 1853 if (argv0_str == NULL) { 1854 ret = -ENOMEM; 1855 goto out; 1856 } 1857 fmt1_str = strtok_r(argv0_str, ":", &fmt); 1858 fmt2_str = strtok_r(NULL, "/", &fmt); 1859 fmt3_str = strtok_r(NULL, " \t", &fmt); 1860 if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) { 1861 semantic_error("Failed to parse event name: %s\n", argv[0]); 1862 ret = -EINVAL; 1863 goto out; 1864 } 1865 pr = fmt1_str[0]; 1866 tev->group = strdup(fmt2_str); 1867 tev->event = strdup(fmt3_str); 1868 if (tev->group == NULL || tev->event == NULL) { 1869 ret = -ENOMEM; 1870 goto out; 1871 } 1872 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); 1873 1874 tp->retprobe = (pr == 'r'); 1875 1876 /* Scan module name(if there), function name and offset */ 1877 p = strchr(argv[1], ':'); 1878 if (p) { 1879 tp->module = strndup(argv[1], p - argv[1]); 1880 if (!tp->module) { 1881 ret = -ENOMEM; 1882 goto out; 1883 } 1884 tev->uprobes = (tp->module[0] == '/'); 1885 p++; 1886 } else 1887 p = argv[1]; 1888 fmt1_str = strtok_r(p, "+", &fmt); 1889 /* only the address started with 0x */ 1890 if (fmt1_str[0] == '0') { 1891 /* 1892 * Fix a special case: 1893 * if address == 0, kernel reports something like: 1894 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax 1895 * Newer kernel may fix that, but we want to 1896 * support old kernel also. 1897 */ 1898 if (strcmp(fmt1_str, "0x") == 0) { 1899 if (!argv[2] || strcmp(argv[2], "(null)")) { 1900 ret = -EINVAL; 1901 goto out; 1902 } 1903 tp->address = 0; 1904 1905 free(argv[2]); 1906 for (i = 2; argv[i + 1] != NULL; i++) 1907 argv[i] = argv[i + 1]; 1908 1909 argv[i] = NULL; 1910 argc -= 1; 1911 } else 1912 tp->address = strtoul(fmt1_str, NULL, 0); 1913 } else { 1914 /* Only the symbol-based probe has offset */ 1915 tp->symbol = strdup(fmt1_str); 1916 if (tp->symbol == NULL) { 1917 ret = -ENOMEM; 1918 goto out; 1919 } 1920 fmt2_str = strtok_r(NULL, "", &fmt); 1921 if (fmt2_str == NULL) 1922 tp->offset = 0; 1923 else 1924 tp->offset = strtoul(fmt2_str, NULL, 10); 1925 } 1926 1927 if (tev->uprobes) { 1928 fmt2_str = strchr(p, '('); 1929 if (fmt2_str) 1930 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0); 1931 } 1932 1933 tev->nargs = argc - 2; 1934 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 1935 if (tev->args == NULL) { 1936 ret = -ENOMEM; 1937 goto out; 1938 } 1939 for (i = 0; i < tev->nargs; i++) { 1940 p = strchr(argv[i + 2], '='); 1941 if (p) /* We don't need which register is assigned. */ 1942 *p++ = '\0'; 1943 else 1944 p = argv[i + 2]; 1945 tev->args[i].name = strdup(argv[i + 2]); 1946 /* TODO: parse regs and offset */ 1947 tev->args[i].value = strdup(p); 1948 if (tev->args[i].name == NULL || tev->args[i].value == NULL) { 1949 ret = -ENOMEM; 1950 goto out; 1951 } 1952 } 1953 ret = 0; 1954 out: 1955 free(argv0_str); 1956 argv_free(argv); 1957 return ret; 1958 } 1959 1960 /* Compose only probe arg */ 1961 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) 1962 { 1963 struct perf_probe_arg_field *field = pa->field; 1964 struct strbuf buf; 1965 char *ret = NULL; 1966 int err; 1967 1968 if (strbuf_init(&buf, 64) < 0) 1969 return NULL; 1970 1971 if (pa->name && pa->var) 1972 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); 1973 else 1974 err = strbuf_addstr(&buf, pa->name ?: pa->var); 1975 if (err) 1976 goto out; 1977 1978 while (field) { 1979 if (field->name[0] == '[') 1980 err = strbuf_addstr(&buf, field->name); 1981 else 1982 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", 1983 field->name); 1984 field = field->next; 1985 if (err) 1986 goto out; 1987 } 1988 1989 if (pa->type) 1990 if (strbuf_addf(&buf, ":%s", pa->type) < 0) 1991 goto out; 1992 1993 ret = strbuf_detach(&buf, NULL); 1994 out: 1995 strbuf_release(&buf); 1996 return ret; 1997 } 1998 1999 /* Compose only probe point (not argument) */ 2000 char *synthesize_perf_probe_point(struct perf_probe_point *pp) 2001 { 2002 struct strbuf buf; 2003 char *tmp, *ret = NULL; 2004 int len, err = 0; 2005 2006 if (strbuf_init(&buf, 64) < 0) 2007 return NULL; 2008 2009 if (pp->function) { 2010 if (strbuf_addstr(&buf, pp->function) < 0) 2011 goto out; 2012 if (pp->offset) 2013 err = strbuf_addf(&buf, "+%lu", pp->offset); 2014 else if (pp->line) 2015 err = strbuf_addf(&buf, ":%d", pp->line); 2016 else if (pp->retprobe) 2017 err = strbuf_addstr(&buf, "%return"); 2018 if (err) 2019 goto out; 2020 } 2021 if (pp->file) { 2022 tmp = pp->file; 2023 len = strlen(tmp); 2024 if (len > 30) { 2025 tmp = strchr(pp->file + len - 30, '/'); 2026 tmp = tmp ? tmp + 1 : pp->file + len - 30; 2027 } 2028 err = strbuf_addf(&buf, "@%s", tmp); 2029 if (!err && !pp->function && pp->line) 2030 err = strbuf_addf(&buf, ":%d", pp->line); 2031 } 2032 if (!err) 2033 ret = strbuf_detach(&buf, NULL); 2034 out: 2035 strbuf_release(&buf); 2036 return ret; 2037 } 2038 2039 char *synthesize_perf_probe_command(struct perf_probe_event *pev) 2040 { 2041 struct strbuf buf; 2042 char *tmp, *ret = NULL; 2043 int i; 2044 2045 if (strbuf_init(&buf, 64)) 2046 return NULL; 2047 if (pev->event) 2048 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, 2049 pev->event) < 0) 2050 goto out; 2051 2052 tmp = synthesize_perf_probe_point(&pev->point); 2053 if (!tmp || strbuf_addstr(&buf, tmp) < 0) 2054 goto out; 2055 free(tmp); 2056 2057 for (i = 0; i < pev->nargs; i++) { 2058 tmp = synthesize_perf_probe_arg(pev->args + i); 2059 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) 2060 goto out; 2061 free(tmp); 2062 } 2063 2064 ret = strbuf_detach(&buf, NULL); 2065 out: 2066 strbuf_release(&buf); 2067 return ret; 2068 } 2069 2070 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, 2071 struct strbuf *buf, int depth) 2072 { 2073 int err; 2074 if (ref->next) { 2075 depth = __synthesize_probe_trace_arg_ref(ref->next, buf, 2076 depth + 1); 2077 if (depth < 0) 2078 return depth; 2079 } 2080 if (ref->user_access) 2081 err = strbuf_addf(buf, "%s%ld(", "+u", ref->offset); 2082 else 2083 err = strbuf_addf(buf, "%+ld(", ref->offset); 2084 return (err < 0) ? err : depth; 2085 } 2086 2087 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, 2088 struct strbuf *buf) 2089 { 2090 struct probe_trace_arg_ref *ref = arg->ref; 2091 int depth = 0, err; 2092 2093 /* Argument name or separator */ 2094 if (arg->name) 2095 err = strbuf_addf(buf, " %s=", arg->name); 2096 else 2097 err = strbuf_addch(buf, ' '); 2098 if (err) 2099 return err; 2100 2101 /* Special case: @XXX */ 2102 if (arg->value[0] == '@' && arg->ref) 2103 ref = ref->next; 2104 2105 /* Dereferencing arguments */ 2106 if (ref) { 2107 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); 2108 if (depth < 0) 2109 return depth; 2110 } 2111 2112 /* Print argument value */ 2113 if (arg->value[0] == '@' && arg->ref) 2114 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); 2115 else 2116 err = strbuf_addstr(buf, arg->value); 2117 2118 /* Closing */ 2119 while (!err && depth--) 2120 err = strbuf_addch(buf, ')'); 2121 2122 /* Print argument type */ 2123 if (!err && arg->type) 2124 err = strbuf_addf(buf, ":%s", arg->type); 2125 2126 return err; 2127 } 2128 2129 static int 2130 synthesize_probe_trace_args(struct probe_trace_event *tev, struct strbuf *buf) 2131 { 2132 int i, ret = 0; 2133 2134 for (i = 0; i < tev->nargs && ret >= 0; i++) 2135 ret = synthesize_probe_trace_arg(&tev->args[i], buf); 2136 2137 return ret; 2138 } 2139 2140 static int 2141 synthesize_uprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf) 2142 { 2143 int err; 2144 2145 /* Uprobes must have tp->module */ 2146 if (!tp->module) 2147 return -EINVAL; 2148 /* 2149 * If tp->address == 0, then this point must be a 2150 * absolute address uprobe. 2151 * try_to_find_absolute_address() should have made 2152 * tp->symbol to "0x0". 2153 */ 2154 if (!tp->address && (!tp->symbol || strcmp(tp->symbol, "0x0"))) 2155 return -EINVAL; 2156 2157 /* Use the tp->address for uprobes */ 2158 err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address); 2159 2160 if (err >= 0 && tp->ref_ctr_offset) { 2161 if (!uprobe_ref_ctr_is_supported()) 2162 return -EINVAL; 2163 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset); 2164 } 2165 return err >= 0 ? 0 : err; 2166 } 2167 2168 static int 2169 synthesize_kprobe_trace_def(struct probe_trace_point *tp, struct strbuf *buf) 2170 { 2171 if (!strncmp(tp->symbol, "0x", 2)) { 2172 /* Absolute address. See try_to_find_absolute_address() */ 2173 return strbuf_addf(buf, "%s%s0x%lx", tp->module ?: "", 2174 tp->module ? ":" : "", tp->address); 2175 } else { 2176 return strbuf_addf(buf, "%s%s%s+%lu", tp->module ?: "", 2177 tp->module ? ":" : "", tp->symbol, tp->offset); 2178 } 2179 } 2180 2181 char *synthesize_probe_trace_command(struct probe_trace_event *tev) 2182 { 2183 struct probe_trace_point *tp = &tev->point; 2184 struct strbuf buf; 2185 char *ret = NULL; 2186 int err; 2187 2188 if (strbuf_init(&buf, 32) < 0) 2189 return NULL; 2190 2191 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', 2192 tev->group, tev->event) < 0) 2193 goto error; 2194 2195 if (tev->uprobes) 2196 err = synthesize_uprobe_trace_def(tp, &buf); 2197 else 2198 err = synthesize_kprobe_trace_def(tp, &buf); 2199 2200 if (err >= 0) 2201 err = synthesize_probe_trace_args(tev, &buf); 2202 2203 if (err >= 0) 2204 ret = strbuf_detach(&buf, NULL); 2205 error: 2206 strbuf_release(&buf); 2207 return ret; 2208 } 2209 2210 static int find_perf_probe_point_from_map(struct probe_trace_point *tp, 2211 struct perf_probe_point *pp, 2212 bool is_kprobe) 2213 { 2214 struct symbol *sym = NULL; 2215 struct map *map = NULL; 2216 u64 addr = tp->address; 2217 int ret = -ENOENT; 2218 2219 if (!is_kprobe) { 2220 map = dso__new_map(tp->module); 2221 if (!map) 2222 goto out; 2223 sym = map__find_symbol(map, addr); 2224 } else { 2225 if (tp->symbol && !addr) { 2226 if (kernel_get_symbol_address_by_name(tp->symbol, 2227 &addr, true, false) < 0) 2228 goto out; 2229 } 2230 if (addr) { 2231 addr += tp->offset; 2232 sym = machine__find_kernel_symbol(host_machine, addr, &map); 2233 } 2234 } 2235 2236 if (!sym) 2237 goto out; 2238 2239 pp->retprobe = tp->retprobe; 2240 pp->offset = addr - map->unmap_ip(map, sym->start); 2241 pp->function = strdup(sym->name); 2242 ret = pp->function ? 0 : -ENOMEM; 2243 2244 out: 2245 if (map && !is_kprobe) { 2246 map__put(map); 2247 } 2248 2249 return ret; 2250 } 2251 2252 static int convert_to_perf_probe_point(struct probe_trace_point *tp, 2253 struct perf_probe_point *pp, 2254 bool is_kprobe) 2255 { 2256 char buf[128]; 2257 int ret; 2258 2259 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); 2260 if (!ret) 2261 return 0; 2262 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); 2263 if (!ret) 2264 return 0; 2265 2266 pr_debug("Failed to find probe point from both of dwarf and map.\n"); 2267 2268 if (tp->symbol) { 2269 pp->function = strdup(tp->symbol); 2270 pp->offset = tp->offset; 2271 } else { 2272 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); 2273 if (ret < 0) 2274 return ret; 2275 pp->function = strdup(buf); 2276 pp->offset = 0; 2277 } 2278 if (pp->function == NULL) 2279 return -ENOMEM; 2280 2281 pp->retprobe = tp->retprobe; 2282 2283 return 0; 2284 } 2285 2286 static int convert_to_perf_probe_event(struct probe_trace_event *tev, 2287 struct perf_probe_event *pev, bool is_kprobe) 2288 { 2289 struct strbuf buf = STRBUF_INIT; 2290 int i, ret; 2291 2292 /* Convert event/group name */ 2293 pev->event = strdup(tev->event); 2294 pev->group = strdup(tev->group); 2295 if (pev->event == NULL || pev->group == NULL) 2296 return -ENOMEM; 2297 2298 /* Convert trace_point to probe_point */ 2299 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); 2300 if (ret < 0) 2301 return ret; 2302 2303 /* Convert trace_arg to probe_arg */ 2304 pev->nargs = tev->nargs; 2305 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 2306 if (pev->args == NULL) 2307 return -ENOMEM; 2308 for (i = 0; i < tev->nargs && ret >= 0; i++) { 2309 if (tev->args[i].name) 2310 pev->args[i].name = strdup(tev->args[i].name); 2311 else { 2312 if ((ret = strbuf_init(&buf, 32)) < 0) 2313 goto error; 2314 ret = synthesize_probe_trace_arg(&tev->args[i], &buf); 2315 pev->args[i].name = strbuf_detach(&buf, NULL); 2316 } 2317 if (pev->args[i].name == NULL && ret >= 0) 2318 ret = -ENOMEM; 2319 } 2320 error: 2321 if (ret < 0) 2322 clear_perf_probe_event(pev); 2323 2324 return ret; 2325 } 2326 2327 void clear_perf_probe_event(struct perf_probe_event *pev) 2328 { 2329 struct perf_probe_arg_field *field, *next; 2330 int i; 2331 2332 zfree(&pev->event); 2333 zfree(&pev->group); 2334 zfree(&pev->target); 2335 clear_perf_probe_point(&pev->point); 2336 2337 for (i = 0; i < pev->nargs; i++) { 2338 zfree(&pev->args[i].name); 2339 zfree(&pev->args[i].var); 2340 zfree(&pev->args[i].type); 2341 field = pev->args[i].field; 2342 while (field) { 2343 next = field->next; 2344 zfree(&field->name); 2345 free(field); 2346 field = next; 2347 } 2348 } 2349 pev->nargs = 0; 2350 zfree(&pev->args); 2351 } 2352 2353 #define strdup_or_goto(str, label) \ 2354 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) 2355 2356 static int perf_probe_point__copy(struct perf_probe_point *dst, 2357 struct perf_probe_point *src) 2358 { 2359 dst->file = strdup_or_goto(src->file, out_err); 2360 dst->function = strdup_or_goto(src->function, out_err); 2361 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); 2362 dst->line = src->line; 2363 dst->retprobe = src->retprobe; 2364 dst->offset = src->offset; 2365 return 0; 2366 2367 out_err: 2368 clear_perf_probe_point(dst); 2369 return -ENOMEM; 2370 } 2371 2372 static int perf_probe_arg__copy(struct perf_probe_arg *dst, 2373 struct perf_probe_arg *src) 2374 { 2375 struct perf_probe_arg_field *field, **ppfield; 2376 2377 dst->name = strdup_or_goto(src->name, out_err); 2378 dst->var = strdup_or_goto(src->var, out_err); 2379 dst->type = strdup_or_goto(src->type, out_err); 2380 2381 field = src->field; 2382 ppfield = &(dst->field); 2383 while (field) { 2384 *ppfield = zalloc(sizeof(*field)); 2385 if (!*ppfield) 2386 goto out_err; 2387 (*ppfield)->name = strdup_or_goto(field->name, out_err); 2388 (*ppfield)->index = field->index; 2389 (*ppfield)->ref = field->ref; 2390 field = field->next; 2391 ppfield = &((*ppfield)->next); 2392 } 2393 return 0; 2394 out_err: 2395 return -ENOMEM; 2396 } 2397 2398 int perf_probe_event__copy(struct perf_probe_event *dst, 2399 struct perf_probe_event *src) 2400 { 2401 int i; 2402 2403 dst->event = strdup_or_goto(src->event, out_err); 2404 dst->group = strdup_or_goto(src->group, out_err); 2405 dst->target = strdup_or_goto(src->target, out_err); 2406 dst->uprobes = src->uprobes; 2407 2408 if (perf_probe_point__copy(&dst->point, &src->point) < 0) 2409 goto out_err; 2410 2411 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); 2412 if (!dst->args) 2413 goto out_err; 2414 dst->nargs = src->nargs; 2415 2416 for (i = 0; i < src->nargs; i++) 2417 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) 2418 goto out_err; 2419 return 0; 2420 2421 out_err: 2422 clear_perf_probe_event(dst); 2423 return -ENOMEM; 2424 } 2425 2426 void clear_probe_trace_event(struct probe_trace_event *tev) 2427 { 2428 struct probe_trace_arg_ref *ref, *next; 2429 int i; 2430 2431 zfree(&tev->event); 2432 zfree(&tev->group); 2433 zfree(&tev->point.symbol); 2434 zfree(&tev->point.realname); 2435 zfree(&tev->point.module); 2436 for (i = 0; i < tev->nargs; i++) { 2437 zfree(&tev->args[i].name); 2438 zfree(&tev->args[i].value); 2439 zfree(&tev->args[i].type); 2440 ref = tev->args[i].ref; 2441 while (ref) { 2442 next = ref->next; 2443 free(ref); 2444 ref = next; 2445 } 2446 } 2447 zfree(&tev->args); 2448 tev->nargs = 0; 2449 } 2450 2451 struct kprobe_blacklist_node { 2452 struct list_head list; 2453 unsigned long start; 2454 unsigned long end; 2455 char *symbol; 2456 }; 2457 2458 static void kprobe_blacklist__delete(struct list_head *blacklist) 2459 { 2460 struct kprobe_blacklist_node *node; 2461 2462 while (!list_empty(blacklist)) { 2463 node = list_first_entry(blacklist, 2464 struct kprobe_blacklist_node, list); 2465 list_del_init(&node->list); 2466 zfree(&node->symbol); 2467 free(node); 2468 } 2469 } 2470 2471 static int kprobe_blacklist__load(struct list_head *blacklist) 2472 { 2473 struct kprobe_blacklist_node *node; 2474 const char *__debugfs = debugfs__mountpoint(); 2475 char buf[PATH_MAX], *p; 2476 FILE *fp; 2477 int ret; 2478 2479 if (__debugfs == NULL) 2480 return -ENOTSUP; 2481 2482 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); 2483 if (ret < 0) 2484 return ret; 2485 2486 fp = fopen(buf, "r"); 2487 if (!fp) 2488 return -errno; 2489 2490 ret = 0; 2491 while (fgets(buf, PATH_MAX, fp)) { 2492 node = zalloc(sizeof(*node)); 2493 if (!node) { 2494 ret = -ENOMEM; 2495 break; 2496 } 2497 INIT_LIST_HEAD(&node->list); 2498 list_add_tail(&node->list, blacklist); 2499 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { 2500 ret = -EINVAL; 2501 break; 2502 } 2503 p = strchr(buf, '\t'); 2504 if (p) { 2505 p++; 2506 if (p[strlen(p) - 1] == '\n') 2507 p[strlen(p) - 1] = '\0'; 2508 } else 2509 p = (char *)"unknown"; 2510 node->symbol = strdup(p); 2511 if (!node->symbol) { 2512 ret = -ENOMEM; 2513 break; 2514 } 2515 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", 2516 node->start, node->end, node->symbol); 2517 ret++; 2518 } 2519 if (ret < 0) 2520 kprobe_blacklist__delete(blacklist); 2521 fclose(fp); 2522 2523 return ret; 2524 } 2525 2526 static struct kprobe_blacklist_node * 2527 kprobe_blacklist__find_by_address(struct list_head *blacklist, 2528 unsigned long address) 2529 { 2530 struct kprobe_blacklist_node *node; 2531 2532 list_for_each_entry(node, blacklist, list) { 2533 if (node->start <= address && address < node->end) 2534 return node; 2535 } 2536 2537 return NULL; 2538 } 2539 2540 static LIST_HEAD(kprobe_blacklist); 2541 2542 static void kprobe_blacklist__init(void) 2543 { 2544 if (!list_empty(&kprobe_blacklist)) 2545 return; 2546 2547 if (kprobe_blacklist__load(&kprobe_blacklist) < 0) 2548 pr_debug("No kprobe blacklist support, ignored\n"); 2549 } 2550 2551 static void kprobe_blacklist__release(void) 2552 { 2553 kprobe_blacklist__delete(&kprobe_blacklist); 2554 } 2555 2556 static bool kprobe_blacklist__listed(unsigned long address) 2557 { 2558 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); 2559 } 2560 2561 static int perf_probe_event__sprintf(const char *group, const char *event, 2562 struct perf_probe_event *pev, 2563 const char *module, 2564 struct strbuf *result) 2565 { 2566 int i, ret; 2567 char *buf; 2568 2569 if (asprintf(&buf, "%s:%s", group, event) < 0) 2570 return -errno; 2571 ret = strbuf_addf(result, " %-20s (on ", buf); 2572 free(buf); 2573 if (ret) 2574 return ret; 2575 2576 /* Synthesize only event probe point */ 2577 buf = synthesize_perf_probe_point(&pev->point); 2578 if (!buf) 2579 return -ENOMEM; 2580 ret = strbuf_addstr(result, buf); 2581 free(buf); 2582 2583 if (!ret && module) 2584 ret = strbuf_addf(result, " in %s", module); 2585 2586 if (!ret && pev->nargs > 0) { 2587 ret = strbuf_add(result, " with", 5); 2588 for (i = 0; !ret && i < pev->nargs; i++) { 2589 buf = synthesize_perf_probe_arg(&pev->args[i]); 2590 if (!buf) 2591 return -ENOMEM; 2592 ret = strbuf_addf(result, " %s", buf); 2593 free(buf); 2594 } 2595 } 2596 if (!ret) 2597 ret = strbuf_addch(result, ')'); 2598 2599 return ret; 2600 } 2601 2602 /* Show an event */ 2603 int show_perf_probe_event(const char *group, const char *event, 2604 struct perf_probe_event *pev, 2605 const char *module, bool use_stdout) 2606 { 2607 struct strbuf buf = STRBUF_INIT; 2608 int ret; 2609 2610 ret = perf_probe_event__sprintf(group, event, pev, module, &buf); 2611 if (ret >= 0) { 2612 if (use_stdout) 2613 printf("%s\n", buf.buf); 2614 else 2615 pr_info("%s\n", buf.buf); 2616 } 2617 strbuf_release(&buf); 2618 2619 return ret; 2620 } 2621 2622 static bool filter_probe_trace_event(struct probe_trace_event *tev, 2623 struct strfilter *filter) 2624 { 2625 char tmp[128]; 2626 2627 /* At first, check the event name itself */ 2628 if (strfilter__compare(filter, tev->event)) 2629 return true; 2630 2631 /* Next, check the combination of name and group */ 2632 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) 2633 return false; 2634 return strfilter__compare(filter, tmp); 2635 } 2636 2637 static int __show_perf_probe_events(int fd, bool is_kprobe, 2638 struct strfilter *filter) 2639 { 2640 int ret = 0; 2641 struct probe_trace_event tev; 2642 struct perf_probe_event pev; 2643 struct strlist *rawlist; 2644 struct str_node *ent; 2645 2646 memset(&tev, 0, sizeof(tev)); 2647 memset(&pev, 0, sizeof(pev)); 2648 2649 rawlist = probe_file__get_rawlist(fd); 2650 if (!rawlist) 2651 return -ENOMEM; 2652 2653 strlist__for_each_entry(ent, rawlist) { 2654 ret = parse_probe_trace_command(ent->s, &tev); 2655 if (ret >= 0) { 2656 if (!filter_probe_trace_event(&tev, filter)) 2657 goto next; 2658 ret = convert_to_perf_probe_event(&tev, &pev, 2659 is_kprobe); 2660 if (ret < 0) 2661 goto next; 2662 ret = show_perf_probe_event(pev.group, pev.event, 2663 &pev, tev.point.module, 2664 true); 2665 } 2666 next: 2667 clear_perf_probe_event(&pev); 2668 clear_probe_trace_event(&tev); 2669 if (ret < 0) 2670 break; 2671 } 2672 strlist__delete(rawlist); 2673 /* Cleanup cached debuginfo if needed */ 2674 debuginfo_cache__exit(); 2675 2676 return ret; 2677 } 2678 2679 /* List up current perf-probe events */ 2680 int show_perf_probe_events(struct strfilter *filter) 2681 { 2682 int kp_fd, up_fd, ret; 2683 2684 setup_pager(); 2685 2686 if (probe_conf.cache) 2687 return probe_cache__show_all_caches(filter); 2688 2689 ret = init_probe_symbol_maps(false); 2690 if (ret < 0) 2691 return ret; 2692 2693 ret = probe_file__open_both(&kp_fd, &up_fd, 0); 2694 if (ret < 0) 2695 return ret; 2696 2697 if (kp_fd >= 0) 2698 ret = __show_perf_probe_events(kp_fd, true, filter); 2699 if (up_fd >= 0 && ret >= 0) 2700 ret = __show_perf_probe_events(up_fd, false, filter); 2701 if (kp_fd > 0) 2702 close(kp_fd); 2703 if (up_fd > 0) 2704 close(up_fd); 2705 exit_probe_symbol_maps(); 2706 2707 return ret; 2708 } 2709 2710 static int get_new_event_name(char *buf, size_t len, const char *base, 2711 struct strlist *namelist, bool ret_event, 2712 bool allow_suffix) 2713 { 2714 int i, ret; 2715 char *p, *nbase; 2716 2717 if (*base == '.') 2718 base++; 2719 nbase = strdup(base); 2720 if (!nbase) 2721 return -ENOMEM; 2722 2723 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ 2724 p = strpbrk(nbase, ".@"); 2725 if (p && p != nbase) 2726 *p = '\0'; 2727 2728 /* Try no suffix number */ 2729 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); 2730 if (ret < 0) { 2731 pr_debug("snprintf() failed: %d\n", ret); 2732 goto out; 2733 } 2734 if (!strlist__has_entry(namelist, buf)) 2735 goto out; 2736 2737 if (!allow_suffix) { 2738 pr_warning("Error: event \"%s\" already exists.\n" 2739 " Hint: Remove existing event by 'perf probe -d'\n" 2740 " or force duplicates by 'perf probe -f'\n" 2741 " or set 'force=yes' in BPF source.\n", 2742 buf); 2743 ret = -EEXIST; 2744 goto out; 2745 } 2746 2747 /* Try to add suffix */ 2748 for (i = 1; i < MAX_EVENT_INDEX; i++) { 2749 ret = e_snprintf(buf, len, "%s_%d", nbase, i); 2750 if (ret < 0) { 2751 pr_debug("snprintf() failed: %d\n", ret); 2752 goto out; 2753 } 2754 if (!strlist__has_entry(namelist, buf)) 2755 break; 2756 } 2757 if (i == MAX_EVENT_INDEX) { 2758 pr_warning("Too many events are on the same function.\n"); 2759 ret = -ERANGE; 2760 } 2761 2762 out: 2763 free(nbase); 2764 2765 /* Final validation */ 2766 if (ret >= 0 && !is_c_func_name(buf)) { 2767 pr_warning("Internal error: \"%s\" is an invalid event name.\n", 2768 buf); 2769 ret = -EINVAL; 2770 } 2771 2772 return ret; 2773 } 2774 2775 /* Warn if the current kernel's uprobe implementation is old */ 2776 static void warn_uprobe_event_compat(struct probe_trace_event *tev) 2777 { 2778 int i; 2779 char *buf = synthesize_probe_trace_command(tev); 2780 struct probe_trace_point *tp = &tev->point; 2781 2782 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) { 2783 pr_warning("A semaphore is associated with %s:%s and " 2784 "seems your kernel doesn't support it.\n", 2785 tev->group, tev->event); 2786 } 2787 2788 /* Old uprobe event doesn't support memory dereference */ 2789 if (!tev->uprobes || tev->nargs == 0 || !buf) 2790 goto out; 2791 2792 for (i = 0; i < tev->nargs; i++) 2793 if (strglobmatch(tev->args[i].value, "[$@+-]*")) { 2794 pr_warning("Please upgrade your kernel to at least " 2795 "3.14 to have access to feature %s\n", 2796 tev->args[i].value); 2797 break; 2798 } 2799 out: 2800 free(buf); 2801 } 2802 2803 /* Set new name from original perf_probe_event and namelist */ 2804 static int probe_trace_event__set_name(struct probe_trace_event *tev, 2805 struct perf_probe_event *pev, 2806 struct strlist *namelist, 2807 bool allow_suffix) 2808 { 2809 const char *event, *group; 2810 char buf[64]; 2811 int ret; 2812 2813 /* If probe_event or trace_event already have the name, reuse it */ 2814 if (pev->event && !pev->sdt) 2815 event = pev->event; 2816 else if (tev->event) 2817 event = tev->event; 2818 else { 2819 /* Or generate new one from probe point */ 2820 if (pev->point.function && 2821 (strncmp(pev->point.function, "0x", 2) != 0) && 2822 !strisglob(pev->point.function)) 2823 event = pev->point.function; 2824 else 2825 event = tev->point.realname; 2826 } 2827 if (pev->group && !pev->sdt) 2828 group = pev->group; 2829 else if (tev->group) 2830 group = tev->group; 2831 else 2832 group = PERFPROBE_GROUP; 2833 2834 /* Get an unused new event name */ 2835 ret = get_new_event_name(buf, 64, event, namelist, 2836 tev->point.retprobe, allow_suffix); 2837 if (ret < 0) 2838 return ret; 2839 2840 event = buf; 2841 2842 tev->event = strdup(event); 2843 tev->group = strdup(group); 2844 if (tev->event == NULL || tev->group == NULL) 2845 return -ENOMEM; 2846 2847 /* 2848 * Add new event name to namelist if multiprobe event is NOT 2849 * supported, since we have to use new event name for following 2850 * probes in that case. 2851 */ 2852 if (!multiprobe_event_is_supported()) 2853 strlist__add(namelist, event); 2854 return 0; 2855 } 2856 2857 static int __open_probe_file_and_namelist(bool uprobe, 2858 struct strlist **namelist) 2859 { 2860 int fd; 2861 2862 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); 2863 if (fd < 0) 2864 return fd; 2865 2866 /* Get current event names */ 2867 *namelist = probe_file__get_namelist(fd); 2868 if (!(*namelist)) { 2869 pr_debug("Failed to get current event list.\n"); 2870 close(fd); 2871 return -ENOMEM; 2872 } 2873 return fd; 2874 } 2875 2876 static int __add_probe_trace_events(struct perf_probe_event *pev, 2877 struct probe_trace_event *tevs, 2878 int ntevs, bool allow_suffix) 2879 { 2880 int i, fd[2] = {-1, -1}, up, ret; 2881 struct probe_trace_event *tev = NULL; 2882 struct probe_cache *cache = NULL; 2883 struct strlist *namelist[2] = {NULL, NULL}; 2884 struct nscookie nsc; 2885 2886 up = pev->uprobes ? 1 : 0; 2887 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); 2888 if (fd[up] < 0) 2889 return fd[up]; 2890 2891 ret = 0; 2892 for (i = 0; i < ntevs; i++) { 2893 tev = &tevs[i]; 2894 up = tev->uprobes ? 1 : 0; 2895 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ 2896 fd[up] = __open_probe_file_and_namelist(up, 2897 &namelist[up]); 2898 if (fd[up] < 0) 2899 goto close_out; 2900 } 2901 /* Skip if the symbol is out of .text or blacklisted */ 2902 if (!tev->point.symbol && !pev->uprobes) 2903 continue; 2904 2905 /* Set new name for tev (and update namelist) */ 2906 ret = probe_trace_event__set_name(tev, pev, namelist[up], 2907 allow_suffix); 2908 if (ret < 0) 2909 break; 2910 2911 nsinfo__mountns_enter(pev->nsi, &nsc); 2912 ret = probe_file__add_event(fd[up], tev); 2913 nsinfo__mountns_exit(&nsc); 2914 if (ret < 0) 2915 break; 2916 2917 /* 2918 * Probes after the first probe which comes from same 2919 * user input are always allowed to add suffix, because 2920 * there might be several addresses corresponding to 2921 * one code line. 2922 */ 2923 allow_suffix = true; 2924 } 2925 if (ret == -EINVAL && pev->uprobes) 2926 warn_uprobe_event_compat(tev); 2927 if (ret == 0 && probe_conf.cache) { 2928 cache = probe_cache__new(pev->target, pev->nsi); 2929 if (!cache || 2930 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || 2931 probe_cache__commit(cache) < 0) 2932 pr_warning("Failed to add event to probe cache\n"); 2933 probe_cache__delete(cache); 2934 } 2935 2936 close_out: 2937 for (up = 0; up < 2; up++) { 2938 strlist__delete(namelist[up]); 2939 if (fd[up] >= 0) 2940 close(fd[up]); 2941 } 2942 return ret; 2943 } 2944 2945 static int find_probe_functions(struct map *map, char *name, 2946 struct symbol **syms) 2947 { 2948 int found = 0; 2949 struct symbol *sym; 2950 struct rb_node *tmp; 2951 const char *norm, *ver; 2952 char *buf = NULL; 2953 bool cut_version = true; 2954 2955 if (map__load(map) < 0) 2956 return -EACCES; /* Possible permission error to load symbols */ 2957 2958 /* If user gives a version, don't cut off the version from symbols */ 2959 if (strchr(name, '@')) 2960 cut_version = false; 2961 2962 map__for_each_symbol(map, sym, tmp) { 2963 norm = arch__normalize_symbol_name(sym->name); 2964 if (!norm) 2965 continue; 2966 2967 if (cut_version) { 2968 /* We don't care about default symbol or not */ 2969 ver = strchr(norm, '@'); 2970 if (ver) { 2971 buf = strndup(norm, ver - norm); 2972 if (!buf) 2973 return -ENOMEM; 2974 norm = buf; 2975 } 2976 } 2977 2978 if (strglobmatch(norm, name)) { 2979 found++; 2980 if (syms && found < probe_conf.max_probes) 2981 syms[found - 1] = sym; 2982 } 2983 if (buf) 2984 zfree(&buf); 2985 } 2986 2987 return found; 2988 } 2989 2990 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, 2991 struct probe_trace_event *tev __maybe_unused, 2992 struct map *map __maybe_unused, 2993 struct symbol *sym __maybe_unused) { } 2994 2995 2996 static void pr_kallsyms_access_error(void) 2997 { 2998 pr_err("Please ensure you can read the /proc/kallsyms symbol addresses.\n" 2999 "If /proc/sys/kernel/kptr_restrict is '2', you can not read\n" 3000 "kernel symbol addresses even if you are a superuser. Please change\n" 3001 "it to '1'. If kptr_restrict is '1', the superuser can read the\n" 3002 "symbol addresses.\n" 3003 "In that case, please run this command again with sudo.\n"); 3004 } 3005 3006 /* 3007 * Find probe function addresses from map. 3008 * Return an error or the number of found probe_trace_event 3009 */ 3010 static int find_probe_trace_events_from_map(struct perf_probe_event *pev, 3011 struct probe_trace_event **tevs) 3012 { 3013 struct map *map = NULL; 3014 struct ref_reloc_sym *reloc_sym = NULL; 3015 struct symbol *sym; 3016 struct symbol **syms = NULL; 3017 struct probe_trace_event *tev; 3018 struct perf_probe_point *pp = &pev->point; 3019 struct probe_trace_point *tp; 3020 int num_matched_functions; 3021 int ret, i, j, skipped = 0; 3022 char *mod_name; 3023 3024 map = get_target_map(pev->target, pev->nsi, pev->uprobes); 3025 if (!map) { 3026 ret = -EINVAL; 3027 goto out; 3028 } 3029 3030 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); 3031 if (!syms) { 3032 ret = -ENOMEM; 3033 goto out; 3034 } 3035 3036 /* 3037 * Load matched symbols: Since the different local symbols may have 3038 * same name but different addresses, this lists all the symbols. 3039 */ 3040 num_matched_functions = find_probe_functions(map, pp->function, syms); 3041 if (num_matched_functions <= 0) { 3042 if (num_matched_functions == -EACCES) { 3043 pr_err("Failed to load symbols from %s\n", 3044 pev->target ?: "/proc/kallsyms"); 3045 if (pev->target) 3046 pr_err("Please ensure the file is not stripped.\n"); 3047 else 3048 pr_kallsyms_access_error(); 3049 } else 3050 pr_err("Failed to find symbol %s in %s\n", pp->function, 3051 pev->target ? : "kernel"); 3052 ret = -ENOENT; 3053 goto out; 3054 } else if (num_matched_functions > probe_conf.max_probes) { 3055 pr_err("Too many functions matched in %s\n", 3056 pev->target ? : "kernel"); 3057 ret = -E2BIG; 3058 goto out; 3059 } 3060 3061 /* Note that the symbols in the kmodule are not relocated */ 3062 if (!pev->uprobes && !pev->target && 3063 (!pp->retprobe || kretprobe_offset_is_supported())) { 3064 reloc_sym = kernel_get_ref_reloc_sym(NULL); 3065 if (!reloc_sym) { 3066 pr_warning("Relocated base symbol is not found! " 3067 "Check /proc/sys/kernel/kptr_restrict\n" 3068 "and /proc/sys/kernel/perf_event_paranoid. " 3069 "Or run as privileged perf user.\n\n"); 3070 ret = -EINVAL; 3071 goto out; 3072 } 3073 } 3074 3075 /* Setup result trace-probe-events */ 3076 *tevs = zalloc(sizeof(*tev) * num_matched_functions); 3077 if (!*tevs) { 3078 ret = -ENOMEM; 3079 goto out; 3080 } 3081 3082 ret = 0; 3083 3084 for (j = 0; j < num_matched_functions; j++) { 3085 sym = syms[j]; 3086 3087 /* There can be duplicated symbols in the map */ 3088 for (i = 0; i < j; i++) 3089 if (sym->start == syms[i]->start) { 3090 pr_debug("Found duplicated symbol %s @ %" PRIx64 "\n", 3091 sym->name, sym->start); 3092 break; 3093 } 3094 if (i != j) 3095 continue; 3096 3097 tev = (*tevs) + ret; 3098 tp = &tev->point; 3099 if (ret == num_matched_functions) { 3100 pr_warning("Too many symbols are listed. Skip it.\n"); 3101 break; 3102 } 3103 ret++; 3104 3105 if (pp->offset > sym->end - sym->start) { 3106 pr_warning("Offset %ld is bigger than the size of %s\n", 3107 pp->offset, sym->name); 3108 ret = -ENOENT; 3109 goto err_out; 3110 } 3111 /* Add one probe point */ 3112 tp->address = map->unmap_ip(map, sym->start) + pp->offset; 3113 3114 /* Check the kprobe (not in module) is within .text */ 3115 if (!pev->uprobes && !pev->target && 3116 kprobe_warn_out_range(sym->name, tp->address)) { 3117 tp->symbol = NULL; /* Skip it */ 3118 skipped++; 3119 } else if (reloc_sym) { 3120 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); 3121 tp->offset = tp->address - reloc_sym->addr; 3122 } else { 3123 tp->symbol = strdup_or_goto(sym->name, nomem_out); 3124 tp->offset = pp->offset; 3125 } 3126 tp->realname = strdup_or_goto(sym->name, nomem_out); 3127 3128 tp->retprobe = pp->retprobe; 3129 if (pev->target) { 3130 if (pev->uprobes) { 3131 tev->point.module = strdup_or_goto(pev->target, 3132 nomem_out); 3133 } else { 3134 mod_name = find_module_name(pev->target); 3135 tev->point.module = 3136 strdup(mod_name ? mod_name : pev->target); 3137 free(mod_name); 3138 if (!tev->point.module) 3139 goto nomem_out; 3140 } 3141 } 3142 tev->uprobes = pev->uprobes; 3143 tev->nargs = pev->nargs; 3144 if (tev->nargs) { 3145 tev->args = zalloc(sizeof(struct probe_trace_arg) * 3146 tev->nargs); 3147 if (tev->args == NULL) 3148 goto nomem_out; 3149 } 3150 for (i = 0; i < tev->nargs; i++) { 3151 if (pev->args[i].name) 3152 tev->args[i].name = 3153 strdup_or_goto(pev->args[i].name, 3154 nomem_out); 3155 3156 tev->args[i].value = strdup_or_goto(pev->args[i].var, 3157 nomem_out); 3158 if (pev->args[i].type) 3159 tev->args[i].type = 3160 strdup_or_goto(pev->args[i].type, 3161 nomem_out); 3162 } 3163 arch__fix_tev_from_maps(pev, tev, map, sym); 3164 } 3165 if (ret == skipped) { 3166 ret = -ENOENT; 3167 goto err_out; 3168 } 3169 3170 out: 3171 map__put(map); 3172 free(syms); 3173 return ret; 3174 3175 nomem_out: 3176 ret = -ENOMEM; 3177 err_out: 3178 clear_probe_trace_events(*tevs, num_matched_functions); 3179 zfree(tevs); 3180 goto out; 3181 } 3182 3183 static int try_to_find_absolute_address(struct perf_probe_event *pev, 3184 struct probe_trace_event **tevs) 3185 { 3186 struct perf_probe_point *pp = &pev->point; 3187 struct probe_trace_event *tev; 3188 struct probe_trace_point *tp; 3189 int i, err; 3190 3191 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) 3192 return -EINVAL; 3193 if (perf_probe_event_need_dwarf(pev)) 3194 return -EINVAL; 3195 3196 /* 3197 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at 3198 * absolute address. 3199 * 3200 * Only one tev can be generated by this. 3201 */ 3202 *tevs = zalloc(sizeof(*tev)); 3203 if (!*tevs) 3204 return -ENOMEM; 3205 3206 tev = *tevs; 3207 tp = &tev->point; 3208 3209 /* 3210 * Don't use tp->offset, use address directly, because 3211 * in synthesize_probe_trace_command() address cannot be 3212 * zero. 3213 */ 3214 tp->address = pev->point.abs_address; 3215 tp->retprobe = pp->retprobe; 3216 tev->uprobes = pev->uprobes; 3217 3218 err = -ENOMEM; 3219 /* 3220 * Give it a '0x' leading symbol name. 3221 * In __add_probe_trace_events, a NULL symbol is interpreted as 3222 * invalid. 3223 */ 3224 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) 3225 goto errout; 3226 3227 /* For kprobe, check range */ 3228 if ((!tev->uprobes) && 3229 (kprobe_warn_out_range(tev->point.symbol, 3230 tev->point.address))) { 3231 err = -EACCES; 3232 goto errout; 3233 } 3234 3235 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) 3236 goto errout; 3237 3238 if (pev->target) { 3239 tp->module = strdup(pev->target); 3240 if (!tp->module) 3241 goto errout; 3242 } 3243 3244 if (tev->group) { 3245 tev->group = strdup(pev->group); 3246 if (!tev->group) 3247 goto errout; 3248 } 3249 3250 if (pev->event) { 3251 tev->event = strdup(pev->event); 3252 if (!tev->event) 3253 goto errout; 3254 } 3255 3256 tev->nargs = pev->nargs; 3257 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 3258 if (!tev->args) 3259 goto errout; 3260 3261 for (i = 0; i < tev->nargs; i++) 3262 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); 3263 3264 return 1; 3265 3266 errout: 3267 clear_probe_trace_events(*tevs, 1); 3268 *tevs = NULL; 3269 return err; 3270 } 3271 3272 /* Concatenate two arrays */ 3273 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) 3274 { 3275 void *ret; 3276 3277 ret = malloc(sz_a + sz_b); 3278 if (ret) { 3279 memcpy(ret, a, sz_a); 3280 memcpy(ret + sz_a, b, sz_b); 3281 } 3282 return ret; 3283 } 3284 3285 static int 3286 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, 3287 struct probe_trace_event **tevs2, int ntevs2) 3288 { 3289 struct probe_trace_event *new_tevs; 3290 int ret = 0; 3291 3292 if (*ntevs == 0) { 3293 *tevs = *tevs2; 3294 *ntevs = ntevs2; 3295 *tevs2 = NULL; 3296 return 0; 3297 } 3298 3299 if (*ntevs + ntevs2 > probe_conf.max_probes) 3300 ret = -E2BIG; 3301 else { 3302 /* Concatenate the array of probe_trace_event */ 3303 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), 3304 *tevs2, ntevs2 * sizeof(**tevs2)); 3305 if (!new_tevs) 3306 ret = -ENOMEM; 3307 else { 3308 free(*tevs); 3309 *tevs = new_tevs; 3310 *ntevs += ntevs2; 3311 } 3312 } 3313 if (ret < 0) 3314 clear_probe_trace_events(*tevs2, ntevs2); 3315 zfree(tevs2); 3316 3317 return ret; 3318 } 3319 3320 /* 3321 * Try to find probe_trace_event from given probe caches. Return the number 3322 * of cached events found, if an error occurs return the error. 3323 */ 3324 static int find_cached_events(struct perf_probe_event *pev, 3325 struct probe_trace_event **tevs, 3326 const char *target) 3327 { 3328 struct probe_cache *cache; 3329 struct probe_cache_entry *entry; 3330 struct probe_trace_event *tmp_tevs = NULL; 3331 int ntevs = 0; 3332 int ret = 0; 3333 3334 cache = probe_cache__new(target, pev->nsi); 3335 /* Return 0 ("not found") if the target has no probe cache. */ 3336 if (!cache) 3337 return 0; 3338 3339 for_each_probe_cache_entry(entry, cache) { 3340 /* Skip the cache entry which has no name */ 3341 if (!entry->pev.event || !entry->pev.group) 3342 continue; 3343 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && 3344 strglobmatch(entry->pev.event, pev->event)) { 3345 ret = probe_cache_entry__get_event(entry, &tmp_tevs); 3346 if (ret > 0) 3347 ret = concat_probe_trace_events(tevs, &ntevs, 3348 &tmp_tevs, ret); 3349 if (ret < 0) 3350 break; 3351 } 3352 } 3353 probe_cache__delete(cache); 3354 if (ret < 0) { 3355 clear_probe_trace_events(*tevs, ntevs); 3356 zfree(tevs); 3357 } else { 3358 ret = ntevs; 3359 if (ntevs > 0 && target && target[0] == '/') 3360 pev->uprobes = true; 3361 } 3362 3363 return ret; 3364 } 3365 3366 /* Try to find probe_trace_event from all probe caches */ 3367 static int find_cached_events_all(struct perf_probe_event *pev, 3368 struct probe_trace_event **tevs) 3369 { 3370 struct probe_trace_event *tmp_tevs = NULL; 3371 struct strlist *bidlist; 3372 struct str_node *nd; 3373 char *pathname; 3374 int ntevs = 0; 3375 int ret; 3376 3377 /* Get the buildid list of all valid caches */ 3378 bidlist = build_id_cache__list_all(true); 3379 if (!bidlist) { 3380 ret = -errno; 3381 pr_debug("Failed to get buildids: %d\n", ret); 3382 return ret; 3383 } 3384 3385 ret = 0; 3386 strlist__for_each_entry(nd, bidlist) { 3387 pathname = build_id_cache__origname(nd->s); 3388 ret = find_cached_events(pev, &tmp_tevs, pathname); 3389 /* In the case of cnt == 0, we just skip it */ 3390 if (ret > 0) 3391 ret = concat_probe_trace_events(tevs, &ntevs, 3392 &tmp_tevs, ret); 3393 free(pathname); 3394 if (ret < 0) 3395 break; 3396 } 3397 strlist__delete(bidlist); 3398 3399 if (ret < 0) { 3400 clear_probe_trace_events(*tevs, ntevs); 3401 zfree(tevs); 3402 } else 3403 ret = ntevs; 3404 3405 return ret; 3406 } 3407 3408 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, 3409 struct probe_trace_event **tevs) 3410 { 3411 struct probe_cache *cache; 3412 struct probe_cache_entry *entry; 3413 struct probe_trace_event *tev; 3414 struct str_node *node; 3415 int ret, i; 3416 3417 if (pev->sdt) { 3418 /* For SDT/cached events, we use special search functions */ 3419 if (!pev->target) 3420 return find_cached_events_all(pev, tevs); 3421 else 3422 return find_cached_events(pev, tevs, pev->target); 3423 } 3424 cache = probe_cache__new(pev->target, pev->nsi); 3425 if (!cache) 3426 return 0; 3427 3428 entry = probe_cache__find(cache, pev); 3429 if (!entry) { 3430 /* SDT must be in the cache */ 3431 ret = pev->sdt ? -ENOENT : 0; 3432 goto out; 3433 } 3434 3435 ret = strlist__nr_entries(entry->tevlist); 3436 if (ret > probe_conf.max_probes) { 3437 pr_debug("Too many entries matched in the cache of %s\n", 3438 pev->target ? : "kernel"); 3439 ret = -E2BIG; 3440 goto out; 3441 } 3442 3443 *tevs = zalloc(ret * sizeof(*tev)); 3444 if (!*tevs) { 3445 ret = -ENOMEM; 3446 goto out; 3447 } 3448 3449 i = 0; 3450 strlist__for_each_entry(node, entry->tevlist) { 3451 tev = &(*tevs)[i++]; 3452 ret = parse_probe_trace_command(node->s, tev); 3453 if (ret < 0) 3454 goto out; 3455 /* Set the uprobes attribute as same as original */ 3456 tev->uprobes = pev->uprobes; 3457 } 3458 ret = i; 3459 3460 out: 3461 probe_cache__delete(cache); 3462 return ret; 3463 } 3464 3465 static int convert_to_probe_trace_events(struct perf_probe_event *pev, 3466 struct probe_trace_event **tevs) 3467 { 3468 int ret; 3469 3470 if (!pev->group && !pev->sdt) { 3471 /* Set group name if not given */ 3472 if (!pev->uprobes) { 3473 pev->group = strdup(PERFPROBE_GROUP); 3474 ret = pev->group ? 0 : -ENOMEM; 3475 } else 3476 ret = convert_exec_to_group(pev->target, &pev->group); 3477 if (ret != 0) { 3478 pr_warning("Failed to make a group name.\n"); 3479 return ret; 3480 } 3481 } 3482 3483 ret = try_to_find_absolute_address(pev, tevs); 3484 if (ret > 0) 3485 return ret; 3486 3487 /* At first, we need to lookup cache entry */ 3488 ret = find_probe_trace_events_from_cache(pev, tevs); 3489 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ 3490 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ 3491 3492 /* Convert perf_probe_event with debuginfo */ 3493 ret = try_to_find_probe_trace_events(pev, tevs); 3494 if (ret != 0) 3495 return ret; /* Found in debuginfo or got an error */ 3496 3497 return find_probe_trace_events_from_map(pev, tevs); 3498 } 3499 3500 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3501 { 3502 int i, ret; 3503 3504 /* Loop 1: convert all events */ 3505 for (i = 0; i < npevs; i++) { 3506 /* Init kprobe blacklist if needed */ 3507 if (!pevs[i].uprobes) 3508 kprobe_blacklist__init(); 3509 /* Convert with or without debuginfo */ 3510 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); 3511 if (ret < 0) 3512 return ret; 3513 pevs[i].ntevs = ret; 3514 } 3515 /* This just release blacklist only if allocated */ 3516 kprobe_blacklist__release(); 3517 3518 return 0; 3519 } 3520 3521 static int show_probe_trace_event(struct probe_trace_event *tev) 3522 { 3523 char *buf = synthesize_probe_trace_command(tev); 3524 3525 if (!buf) { 3526 pr_debug("Failed to synthesize probe trace event.\n"); 3527 return -EINVAL; 3528 } 3529 3530 /* Showing definition always go stdout */ 3531 printf("%s\n", buf); 3532 free(buf); 3533 3534 return 0; 3535 } 3536 3537 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) 3538 { 3539 struct strlist *namelist = strlist__new(NULL, NULL); 3540 struct probe_trace_event *tev; 3541 struct perf_probe_event *pev; 3542 int i, j, ret = 0; 3543 3544 if (!namelist) 3545 return -ENOMEM; 3546 3547 for (j = 0; j < npevs && !ret; j++) { 3548 pev = &pevs[j]; 3549 for (i = 0; i < pev->ntevs && !ret; i++) { 3550 tev = &pev->tevs[i]; 3551 /* Skip if the symbol is out of .text or blacklisted */ 3552 if (!tev->point.symbol && !pev->uprobes) 3553 continue; 3554 3555 /* Set new name for tev (and update namelist) */ 3556 ret = probe_trace_event__set_name(tev, pev, 3557 namelist, true); 3558 if (!ret) 3559 ret = show_probe_trace_event(tev); 3560 } 3561 } 3562 strlist__delete(namelist); 3563 3564 return ret; 3565 } 3566 3567 static int show_bootconfig_event(struct probe_trace_event *tev) 3568 { 3569 struct probe_trace_point *tp = &tev->point; 3570 struct strbuf buf; 3571 char *ret = NULL; 3572 int err; 3573 3574 if (strbuf_init(&buf, 32) < 0) 3575 return -ENOMEM; 3576 3577 err = synthesize_kprobe_trace_def(tp, &buf); 3578 if (err >= 0) 3579 err = synthesize_probe_trace_args(tev, &buf); 3580 if (err >= 0) 3581 ret = strbuf_detach(&buf, NULL); 3582 strbuf_release(&buf); 3583 3584 if (ret) { 3585 printf("'%s'", ret); 3586 free(ret); 3587 } 3588 3589 return err; 3590 } 3591 3592 int show_bootconfig_events(struct perf_probe_event *pevs, int npevs) 3593 { 3594 struct strlist *namelist = strlist__new(NULL, NULL); 3595 struct probe_trace_event *tev; 3596 struct perf_probe_event *pev; 3597 char *cur_name = NULL; 3598 int i, j, ret = 0; 3599 3600 if (!namelist) 3601 return -ENOMEM; 3602 3603 for (j = 0; j < npevs && !ret; j++) { 3604 pev = &pevs[j]; 3605 if (pev->group && strcmp(pev->group, "probe")) 3606 pr_warning("WARN: Group name %s is ignored\n", pev->group); 3607 if (pev->uprobes) { 3608 pr_warning("ERROR: Bootconfig doesn't support uprobes\n"); 3609 ret = -EINVAL; 3610 break; 3611 } 3612 for (i = 0; i < pev->ntevs && !ret; i++) { 3613 tev = &pev->tevs[i]; 3614 /* Skip if the symbol is out of .text or blacklisted */ 3615 if (!tev->point.symbol && !pev->uprobes) 3616 continue; 3617 3618 /* Set new name for tev (and update namelist) */ 3619 ret = probe_trace_event__set_name(tev, pev, 3620 namelist, true); 3621 if (ret) 3622 break; 3623 3624 if (!cur_name || strcmp(cur_name, tev->event)) { 3625 printf("%sftrace.event.kprobes.%s.probe = ", 3626 cur_name ? "\n" : "", tev->event); 3627 cur_name = tev->event; 3628 } else 3629 printf(", "); 3630 ret = show_bootconfig_event(tev); 3631 } 3632 } 3633 printf("\n"); 3634 strlist__delete(namelist); 3635 3636 return ret; 3637 } 3638 3639 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3640 { 3641 int i, ret = 0; 3642 3643 /* Loop 2: add all events */ 3644 for (i = 0; i < npevs; i++) { 3645 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, 3646 pevs[i].ntevs, 3647 probe_conf.force_add); 3648 if (ret < 0) 3649 break; 3650 } 3651 return ret; 3652 } 3653 3654 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3655 { 3656 int i, j; 3657 struct perf_probe_event *pev; 3658 3659 /* Loop 3: cleanup and free trace events */ 3660 for (i = 0; i < npevs; i++) { 3661 pev = &pevs[i]; 3662 for (j = 0; j < pevs[i].ntevs; j++) 3663 clear_probe_trace_event(&pevs[i].tevs[j]); 3664 zfree(&pevs[i].tevs); 3665 pevs[i].ntevs = 0; 3666 nsinfo__zput(pev->nsi); 3667 clear_perf_probe_event(&pevs[i]); 3668 } 3669 } 3670 3671 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3672 { 3673 int ret; 3674 3675 ret = init_probe_symbol_maps(pevs->uprobes); 3676 if (ret < 0) 3677 return ret; 3678 3679 ret = convert_perf_probe_events(pevs, npevs); 3680 if (ret == 0) 3681 ret = apply_perf_probe_events(pevs, npevs); 3682 3683 cleanup_perf_probe_events(pevs, npevs); 3684 3685 exit_probe_symbol_maps(); 3686 return ret; 3687 } 3688 3689 int del_perf_probe_events(struct strfilter *filter) 3690 { 3691 int ret, ret2, ufd = -1, kfd = -1; 3692 char *str = strfilter__string(filter); 3693 3694 if (!str) 3695 return -EINVAL; 3696 3697 /* Get current event names */ 3698 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); 3699 if (ret < 0) 3700 goto out; 3701 3702 ret = probe_file__del_events(kfd, filter); 3703 if (ret < 0 && ret != -ENOENT) 3704 goto error; 3705 3706 ret2 = probe_file__del_events(ufd, filter); 3707 if (ret2 < 0 && ret2 != -ENOENT) { 3708 ret = ret2; 3709 goto error; 3710 } 3711 ret = 0; 3712 3713 error: 3714 if (kfd >= 0) 3715 close(kfd); 3716 if (ufd >= 0) 3717 close(ufd); 3718 out: 3719 free(str); 3720 3721 return ret; 3722 } 3723 3724 int show_available_funcs(const char *target, struct nsinfo *nsi, 3725 struct strfilter *_filter, bool user) 3726 { 3727 struct rb_node *nd; 3728 struct map *map; 3729 int ret; 3730 3731 ret = init_probe_symbol_maps(user); 3732 if (ret < 0) 3733 return ret; 3734 3735 /* Get a symbol map */ 3736 map = get_target_map(target, nsi, user); 3737 if (!map) { 3738 pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); 3739 return -EINVAL; 3740 } 3741 3742 ret = map__load(map); 3743 if (ret) { 3744 if (ret == -2) { 3745 char *str = strfilter__string(_filter); 3746 pr_err("Failed to find symbols matched to \"%s\"\n", 3747 str); 3748 free(str); 3749 } else 3750 pr_err("Failed to load symbols in %s\n", 3751 (target) ? : "kernel"); 3752 goto end; 3753 } 3754 if (!dso__sorted_by_name(map->dso)) 3755 dso__sort_by_name(map->dso); 3756 3757 /* Show all (filtered) symbols */ 3758 setup_pager(); 3759 3760 for (nd = rb_first_cached(&map->dso->symbol_names); nd; 3761 nd = rb_next(nd)) { 3762 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 3763 3764 if (strfilter__compare(_filter, pos->sym.name)) 3765 printf("%s\n", pos->sym.name); 3766 } 3767 end: 3768 map__put(map); 3769 exit_probe_symbol_maps(); 3770 3771 return ret; 3772 } 3773 3774 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, 3775 struct perf_probe_arg *pvar) 3776 { 3777 tvar->value = strdup(pvar->var); 3778 if (tvar->value == NULL) 3779 return -ENOMEM; 3780 if (pvar->type) { 3781 tvar->type = strdup(pvar->type); 3782 if (tvar->type == NULL) 3783 return -ENOMEM; 3784 } 3785 if (pvar->name) { 3786 tvar->name = strdup(pvar->name); 3787 if (tvar->name == NULL) 3788 return -ENOMEM; 3789 } else 3790 tvar->name = NULL; 3791 return 0; 3792 } 3793