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 nsinfo__put(map->dso->nsinfo); 184 map->dso->nsinfo = nsinfo__get(nsi); 185 } 186 return map; 187 } else { 188 return kernel_get_module_map(target); 189 } 190 } 191 192 static int convert_exec_to_group(const char *exec, char **result) 193 { 194 char *ptr1, *ptr2, *exec_copy; 195 char buf[64]; 196 int ret; 197 198 exec_copy = strdup(exec); 199 if (!exec_copy) 200 return -ENOMEM; 201 202 ptr1 = basename(exec_copy); 203 if (!ptr1) { 204 ret = -EINVAL; 205 goto out; 206 } 207 208 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { 209 if (!isalnum(*ptr2) && *ptr2 != '_') { 210 *ptr2 = '\0'; 211 break; 212 } 213 } 214 215 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); 216 if (ret < 0) 217 goto out; 218 219 *result = strdup(buf); 220 ret = *result ? 0 : -ENOMEM; 221 222 out: 223 free(exec_copy); 224 return ret; 225 } 226 227 static void clear_perf_probe_point(struct perf_probe_point *pp) 228 { 229 zfree(&pp->file); 230 zfree(&pp->function); 231 zfree(&pp->lazy_line); 232 } 233 234 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) 235 { 236 int i; 237 238 for (i = 0; i < ntevs; i++) 239 clear_probe_trace_event(tevs + i); 240 } 241 242 static bool kprobe_blacklist__listed(u64 address); 243 static bool kprobe_warn_out_range(const char *symbol, u64 address) 244 { 245 struct map *map; 246 bool ret = false; 247 248 map = kernel_get_module_map(NULL); 249 if (map) { 250 ret = address <= map->start || map->end < address; 251 if (ret) 252 pr_warning("%s is out of .text, skip it.\n", symbol); 253 map__put(map); 254 } 255 if (!ret && kprobe_blacklist__listed(address)) { 256 pr_warning("%s is blacklisted function, skip it.\n", symbol); 257 ret = true; 258 } 259 260 return ret; 261 } 262 263 /* 264 * @module can be module name of module file path. In case of path, 265 * inspect elf and find out what is actual module name. 266 * Caller has to free mod_name after using it. 267 */ 268 static char *find_module_name(const char *module) 269 { 270 int fd; 271 Elf *elf; 272 GElf_Ehdr ehdr; 273 GElf_Shdr shdr; 274 Elf_Data *data; 275 Elf_Scn *sec; 276 char *mod_name = NULL; 277 int name_offset; 278 279 fd = open(module, O_RDONLY); 280 if (fd < 0) 281 return NULL; 282 283 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 284 if (elf == NULL) 285 goto elf_err; 286 287 if (gelf_getehdr(elf, &ehdr) == NULL) 288 goto ret_err; 289 290 sec = elf_section_by_name(elf, &ehdr, &shdr, 291 ".gnu.linkonce.this_module", NULL); 292 if (!sec) 293 goto ret_err; 294 295 data = elf_getdata(sec, NULL); 296 if (!data || !data->d_buf) 297 goto ret_err; 298 299 /* 300 * NOTE: 301 * '.gnu.linkonce.this_module' section of kernel module elf directly 302 * maps to 'struct module' from linux/module.h. This section contains 303 * actual module name which will be used by kernel after loading it. 304 * But, we cannot use 'struct module' here since linux/module.h is not 305 * exposed to user-space. Offset of 'name' has remained same from long 306 * time, so hardcoding it here. 307 */ 308 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) 309 name_offset = 12; 310 else /* expect ELFCLASS64 by default */ 311 name_offset = 24; 312 313 mod_name = strdup((char *)data->d_buf + name_offset); 314 315 ret_err: 316 elf_end(elf); 317 elf_err: 318 close(fd); 319 return mod_name; 320 } 321 322 #ifdef HAVE_DWARF_SUPPORT 323 324 static int kernel_get_module_dso(const char *module, struct dso **pdso) 325 { 326 struct dso *dso; 327 struct map *map; 328 const char *vmlinux_name; 329 int ret = 0; 330 331 if (module) { 332 char module_name[128]; 333 334 snprintf(module_name, sizeof(module_name), "[%s]", module); 335 map = maps__find_by_name(machine__kernel_maps(host_machine), module_name); 336 if (map) { 337 dso = map->dso; 338 goto found; 339 } 340 pr_debug("Failed to find module %s.\n", module); 341 return -ENOENT; 342 } 343 344 map = machine__kernel_map(host_machine); 345 dso = map->dso; 346 if (!dso->has_build_id) 347 dso__read_running_kernel_build_id(dso, host_machine); 348 349 vmlinux_name = symbol_conf.vmlinux_name; 350 dso->load_errno = 0; 351 if (vmlinux_name) 352 ret = dso__load_vmlinux(dso, map, vmlinux_name, false); 353 else 354 ret = dso__load_vmlinux_path(dso, map); 355 found: 356 *pdso = dso; 357 return ret; 358 } 359 360 /* 361 * Some binaries like glibc have special symbols which are on the symbol 362 * table, but not in the debuginfo. If we can find the address of the 363 * symbol from map, we can translate the address back to the probe point. 364 */ 365 static int find_alternative_probe_point(struct debuginfo *dinfo, 366 struct perf_probe_point *pp, 367 struct perf_probe_point *result, 368 const char *target, struct nsinfo *nsi, 369 bool uprobes) 370 { 371 struct map *map = NULL; 372 struct symbol *sym; 373 u64 address = 0; 374 int ret = -ENOENT; 375 376 /* This can work only for function-name based one */ 377 if (!pp->function || pp->file) 378 return -ENOTSUP; 379 380 map = get_target_map(target, nsi, uprobes); 381 if (!map) 382 return -EINVAL; 383 384 /* Find the address of given function */ 385 map__for_each_symbol_by_name(map, pp->function, sym) { 386 if (uprobes) { 387 address = sym->start; 388 if (sym->type == STT_GNU_IFUNC) 389 pr_warning("Warning: The probe function (%s) is a GNU indirect function.\n" 390 "Consider identifying the final function used at run time and set the probe directly on that.\n", 391 pp->function); 392 } else 393 address = map->unmap_ip(map, sym->start) - map->reloc; 394 break; 395 } 396 if (!address) { 397 ret = -ENOENT; 398 goto out; 399 } 400 pr_debug("Symbol %s address found : %" PRIx64 "\n", 401 pp->function, address); 402 403 ret = debuginfo__find_probe_point(dinfo, address, result); 404 if (ret <= 0) 405 ret = (!ret) ? -ENOENT : ret; 406 else { 407 result->offset += pp->offset; 408 result->line += pp->line; 409 result->retprobe = pp->retprobe; 410 ret = 0; 411 } 412 413 out: 414 map__put(map); 415 return ret; 416 417 } 418 419 static int get_alternative_probe_event(struct debuginfo *dinfo, 420 struct perf_probe_event *pev, 421 struct perf_probe_point *tmp) 422 { 423 int ret; 424 425 memcpy(tmp, &pev->point, sizeof(*tmp)); 426 memset(&pev->point, 0, sizeof(pev->point)); 427 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, 428 pev->nsi, pev->uprobes); 429 if (ret < 0) 430 memcpy(&pev->point, tmp, sizeof(*tmp)); 431 432 return ret; 433 } 434 435 static int get_alternative_line_range(struct debuginfo *dinfo, 436 struct line_range *lr, 437 const char *target, bool user) 438 { 439 struct perf_probe_point pp = { .function = lr->function, 440 .file = lr->file, 441 .line = lr->start }; 442 struct perf_probe_point result; 443 int ret, len = 0; 444 445 memset(&result, 0, sizeof(result)); 446 447 if (lr->end != INT_MAX) 448 len = lr->end - lr->start; 449 ret = find_alternative_probe_point(dinfo, &pp, &result, 450 target, NULL, user); 451 if (!ret) { 452 lr->function = result.function; 453 lr->file = result.file; 454 lr->start = result.line; 455 if (lr->end != INT_MAX) 456 lr->end = lr->start + len; 457 clear_perf_probe_point(&pp); 458 } 459 return ret; 460 } 461 462 #ifdef HAVE_DEBUGINFOD_SUPPORT 463 static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *nsi, 464 bool silent) 465 { 466 debuginfod_client *c = debuginfod_begin(); 467 char sbuild_id[SBUILD_ID_SIZE + 1]; 468 struct debuginfo *ret = NULL; 469 struct nscookie nsc; 470 char *path; 471 int fd; 472 473 if (!c) 474 return NULL; 475 476 build_id__sprintf(&dso->bid, sbuild_id); 477 fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id, 478 0, &path); 479 if (fd >= 0) 480 close(fd); 481 debuginfod_end(c); 482 if (fd < 0) { 483 if (!silent) 484 pr_debug("Failed to find debuginfo in debuginfod.\n"); 485 return NULL; 486 } 487 if (!silent) 488 pr_debug("Load debuginfo from debuginfod (%s)\n", path); 489 490 nsinfo__mountns_enter(nsi, &nsc); 491 ret = debuginfo__new((const char *)path); 492 nsinfo__mountns_exit(&nsc); 493 return ret; 494 } 495 #else 496 static inline 497 struct debuginfo *open_from_debuginfod(struct dso *dso __maybe_unused, 498 struct nsinfo *nsi __maybe_unused, 499 bool silent __maybe_unused) 500 { 501 return NULL; 502 } 503 #endif 504 505 /* Open new debuginfo of given module */ 506 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, 507 bool silent) 508 { 509 const char *path = module; 510 char reason[STRERR_BUFSIZE]; 511 struct debuginfo *ret = NULL; 512 struct dso *dso = NULL; 513 struct nscookie nsc; 514 int err; 515 516 if (!module || !strchr(module, '/')) { 517 err = kernel_get_module_dso(module, &dso); 518 if (err < 0) { 519 if (!dso || dso->load_errno == 0) { 520 if (!str_error_r(-err, reason, STRERR_BUFSIZE)) 521 strcpy(reason, "(unknown)"); 522 } else 523 dso__strerror_load(dso, reason, STRERR_BUFSIZE); 524 if (dso) 525 ret = open_from_debuginfod(dso, nsi, silent); 526 if (ret) 527 return ret; 528 if (!silent) { 529 if (module) 530 pr_err("Module %s is not loaded, please specify its full path name.\n", module); 531 else 532 pr_err("Failed to find the path for the kernel: %s\n", reason); 533 } 534 return NULL; 535 } 536 path = dso->long_name; 537 } 538 nsinfo__mountns_enter(nsi, &nsc); 539 ret = debuginfo__new(path); 540 if (!ret && !silent) { 541 pr_warning("The %s file has no debug information.\n", path); 542 if (!module || !strtailcmp(path, ".ko")) 543 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); 544 else 545 pr_warning("Rebuild with -g, "); 546 pr_warning("or install an appropriate debuginfo package.\n"); 547 } 548 nsinfo__mountns_exit(&nsc); 549 return ret; 550 } 551 552 /* For caching the last debuginfo */ 553 static struct debuginfo *debuginfo_cache; 554 static char *debuginfo_cache_path; 555 556 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) 557 { 558 const char *path = module; 559 560 /* If the module is NULL, it should be the kernel. */ 561 if (!module) 562 path = "kernel"; 563 564 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) 565 goto out; 566 567 /* Copy module path */ 568 free(debuginfo_cache_path); 569 debuginfo_cache_path = strdup(path); 570 if (!debuginfo_cache_path) { 571 debuginfo__delete(debuginfo_cache); 572 debuginfo_cache = NULL; 573 goto out; 574 } 575 576 debuginfo_cache = open_debuginfo(module, NULL, silent); 577 if (!debuginfo_cache) 578 zfree(&debuginfo_cache_path); 579 out: 580 return debuginfo_cache; 581 } 582 583 static void debuginfo_cache__exit(void) 584 { 585 debuginfo__delete(debuginfo_cache); 586 debuginfo_cache = NULL; 587 zfree(&debuginfo_cache_path); 588 } 589 590 591 static int get_text_start_address(const char *exec, u64 *address, 592 struct nsinfo *nsi) 593 { 594 Elf *elf; 595 GElf_Ehdr ehdr; 596 GElf_Shdr shdr; 597 int fd, ret = -ENOENT; 598 struct nscookie nsc; 599 600 nsinfo__mountns_enter(nsi, &nsc); 601 fd = open(exec, O_RDONLY); 602 nsinfo__mountns_exit(&nsc); 603 if (fd < 0) 604 return -errno; 605 606 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 607 if (elf == NULL) { 608 ret = -EINVAL; 609 goto out_close; 610 } 611 612 if (gelf_getehdr(elf, &ehdr) == NULL) 613 goto out; 614 615 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) 616 goto out; 617 618 *address = shdr.sh_addr - shdr.sh_offset; 619 ret = 0; 620 out: 621 elf_end(elf); 622 out_close: 623 close(fd); 624 625 return ret; 626 } 627 628 /* 629 * Convert trace point to probe point with debuginfo 630 */ 631 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, 632 struct perf_probe_point *pp, 633 bool is_kprobe) 634 { 635 struct debuginfo *dinfo = NULL; 636 u64 stext = 0; 637 u64 addr = tp->address; 638 int ret = -ENOENT; 639 640 /* convert the address to dwarf address */ 641 if (!is_kprobe) { 642 if (!addr) { 643 ret = -EINVAL; 644 goto error; 645 } 646 ret = get_text_start_address(tp->module, &stext, NULL); 647 if (ret < 0) 648 goto error; 649 addr += stext; 650 } else if (tp->symbol) { 651 /* If the module is given, this returns relative address */ 652 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, 653 false, !!tp->module); 654 if (ret != 0) 655 goto error; 656 addr += tp->offset; 657 } 658 659 pr_debug("try to find information at %" PRIx64 " in %s\n", addr, 660 tp->module ? : "kernel"); 661 662 dinfo = debuginfo_cache__open(tp->module, verbose <= 0); 663 if (dinfo) 664 ret = debuginfo__find_probe_point(dinfo, 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, u64 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 u64 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 u64 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, 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 = strtoull(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 = strtoull(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%" PRIx64, 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%" PRIx64, 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, 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 u64 start; 2454 u64 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%" PRIx64 "-0x%" PRIx64, &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%" PRIx64 "-0x%" PRIx64 ", %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, u64 address) 2528 { 2529 struct kprobe_blacklist_node *node; 2530 2531 list_for_each_entry(node, blacklist, list) { 2532 if (node->start <= address && address < node->end) 2533 return node; 2534 } 2535 2536 return NULL; 2537 } 2538 2539 static LIST_HEAD(kprobe_blacklist); 2540 2541 static void kprobe_blacklist__init(void) 2542 { 2543 if (!list_empty(&kprobe_blacklist)) 2544 return; 2545 2546 if (kprobe_blacklist__load(&kprobe_blacklist) < 0) 2547 pr_debug("No kprobe blacklist support, ignored\n"); 2548 } 2549 2550 static void kprobe_blacklist__release(void) 2551 { 2552 kprobe_blacklist__delete(&kprobe_blacklist); 2553 } 2554 2555 static bool kprobe_blacklist__listed(u64 address) 2556 { 2557 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); 2558 } 2559 2560 static int perf_probe_event__sprintf(const char *group, const char *event, 2561 struct perf_probe_event *pev, 2562 const char *module, 2563 struct strbuf *result) 2564 { 2565 int i, ret; 2566 char *buf; 2567 2568 if (asprintf(&buf, "%s:%s", group, event) < 0) 2569 return -errno; 2570 ret = strbuf_addf(result, " %-20s (on ", buf); 2571 free(buf); 2572 if (ret) 2573 return ret; 2574 2575 /* Synthesize only event probe point */ 2576 buf = synthesize_perf_probe_point(&pev->point); 2577 if (!buf) 2578 return -ENOMEM; 2579 ret = strbuf_addstr(result, buf); 2580 free(buf); 2581 2582 if (!ret && module) 2583 ret = strbuf_addf(result, " in %s", module); 2584 2585 if (!ret && pev->nargs > 0) { 2586 ret = strbuf_add(result, " with", 5); 2587 for (i = 0; !ret && i < pev->nargs; i++) { 2588 buf = synthesize_perf_probe_arg(&pev->args[i]); 2589 if (!buf) 2590 return -ENOMEM; 2591 ret = strbuf_addf(result, " %s", buf); 2592 free(buf); 2593 } 2594 } 2595 if (!ret) 2596 ret = strbuf_addch(result, ')'); 2597 2598 return ret; 2599 } 2600 2601 /* Show an event */ 2602 int show_perf_probe_event(const char *group, const char *event, 2603 struct perf_probe_event *pev, 2604 const char *module, bool use_stdout) 2605 { 2606 struct strbuf buf = STRBUF_INIT; 2607 int ret; 2608 2609 ret = perf_probe_event__sprintf(group, event, pev, module, &buf); 2610 if (ret >= 0) { 2611 if (use_stdout) 2612 printf("%s\n", buf.buf); 2613 else 2614 pr_info("%s\n", buf.buf); 2615 } 2616 strbuf_release(&buf); 2617 2618 return ret; 2619 } 2620 2621 static bool filter_probe_trace_event(struct probe_trace_event *tev, 2622 struct strfilter *filter) 2623 { 2624 char tmp[128]; 2625 2626 /* At first, check the event name itself */ 2627 if (strfilter__compare(filter, tev->event)) 2628 return true; 2629 2630 /* Next, check the combination of name and group */ 2631 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) 2632 return false; 2633 return strfilter__compare(filter, tmp); 2634 } 2635 2636 static int __show_perf_probe_events(int fd, bool is_kprobe, 2637 struct strfilter *filter) 2638 { 2639 int ret = 0; 2640 struct probe_trace_event tev; 2641 struct perf_probe_event pev; 2642 struct strlist *rawlist; 2643 struct str_node *ent; 2644 2645 memset(&tev, 0, sizeof(tev)); 2646 memset(&pev, 0, sizeof(pev)); 2647 2648 rawlist = probe_file__get_rawlist(fd); 2649 if (!rawlist) 2650 return -ENOMEM; 2651 2652 strlist__for_each_entry(ent, rawlist) { 2653 ret = parse_probe_trace_command(ent->s, &tev); 2654 if (ret >= 0) { 2655 if (!filter_probe_trace_event(&tev, filter)) 2656 goto next; 2657 ret = convert_to_perf_probe_event(&tev, &pev, 2658 is_kprobe); 2659 if (ret < 0) 2660 goto next; 2661 ret = show_perf_probe_event(pev.group, pev.event, 2662 &pev, tev.point.module, 2663 true); 2664 } 2665 next: 2666 clear_perf_probe_event(&pev); 2667 clear_probe_trace_event(&tev); 2668 if (ret < 0) 2669 break; 2670 } 2671 strlist__delete(rawlist); 2672 /* Cleanup cached debuginfo if needed */ 2673 debuginfo_cache__exit(); 2674 2675 return ret; 2676 } 2677 2678 /* List up current perf-probe events */ 2679 int show_perf_probe_events(struct strfilter *filter) 2680 { 2681 int kp_fd, up_fd, ret; 2682 2683 setup_pager(); 2684 2685 if (probe_conf.cache) 2686 return probe_cache__show_all_caches(filter); 2687 2688 ret = init_probe_symbol_maps(false); 2689 if (ret < 0) 2690 return ret; 2691 2692 ret = probe_file__open_both(&kp_fd, &up_fd, 0); 2693 if (ret < 0) 2694 return ret; 2695 2696 if (kp_fd >= 0) 2697 ret = __show_perf_probe_events(kp_fd, true, filter); 2698 if (up_fd >= 0 && ret >= 0) 2699 ret = __show_perf_probe_events(up_fd, false, filter); 2700 if (kp_fd > 0) 2701 close(kp_fd); 2702 if (up_fd > 0) 2703 close(up_fd); 2704 exit_probe_symbol_maps(); 2705 2706 return ret; 2707 } 2708 2709 static int get_new_event_name(char *buf, size_t len, const char *base, 2710 struct strlist *namelist, bool ret_event, 2711 bool allow_suffix) 2712 { 2713 int i, ret; 2714 char *p, *nbase; 2715 2716 if (*base == '.') 2717 base++; 2718 nbase = strdup(base); 2719 if (!nbase) 2720 return -ENOMEM; 2721 2722 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ 2723 p = strpbrk(nbase, ".@"); 2724 if (p && p != nbase) 2725 *p = '\0'; 2726 2727 /* Try no suffix number */ 2728 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); 2729 if (ret < 0) { 2730 pr_debug("snprintf() failed: %d\n", ret); 2731 goto out; 2732 } 2733 if (!strlist__has_entry(namelist, buf)) 2734 goto out; 2735 2736 if (!allow_suffix) { 2737 pr_warning("Error: event \"%s\" already exists.\n" 2738 " Hint: Remove existing event by 'perf probe -d'\n" 2739 " or force duplicates by 'perf probe -f'\n" 2740 " or set 'force=yes' in BPF source.\n", 2741 buf); 2742 ret = -EEXIST; 2743 goto out; 2744 } 2745 2746 /* Try to add suffix */ 2747 for (i = 1; i < MAX_EVENT_INDEX; i++) { 2748 ret = e_snprintf(buf, len, "%s_%d", nbase, i); 2749 if (ret < 0) { 2750 pr_debug("snprintf() failed: %d\n", ret); 2751 goto out; 2752 } 2753 if (!strlist__has_entry(namelist, buf)) 2754 break; 2755 } 2756 if (i == MAX_EVENT_INDEX) { 2757 pr_warning("Too many events are on the same function.\n"); 2758 ret = -ERANGE; 2759 } 2760 2761 out: 2762 free(nbase); 2763 2764 /* Final validation */ 2765 if (ret >= 0 && !is_c_func_name(buf)) { 2766 pr_warning("Internal error: \"%s\" is an invalid event name.\n", 2767 buf); 2768 ret = -EINVAL; 2769 } 2770 2771 return ret; 2772 } 2773 2774 /* Warn if the current kernel's uprobe implementation is old */ 2775 static void warn_uprobe_event_compat(struct probe_trace_event *tev) 2776 { 2777 int i; 2778 char *buf = synthesize_probe_trace_command(tev); 2779 struct probe_trace_point *tp = &tev->point; 2780 2781 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) { 2782 pr_warning("A semaphore is associated with %s:%s and " 2783 "seems your kernel doesn't support it.\n", 2784 tev->group, tev->event); 2785 } 2786 2787 /* Old uprobe event doesn't support memory dereference */ 2788 if (!tev->uprobes || tev->nargs == 0 || !buf) 2789 goto out; 2790 2791 for (i = 0; i < tev->nargs; i++) 2792 if (strglobmatch(tev->args[i].value, "[$@+-]*")) { 2793 pr_warning("Please upgrade your kernel to at least " 2794 "3.14 to have access to feature %s\n", 2795 tev->args[i].value); 2796 break; 2797 } 2798 out: 2799 free(buf); 2800 } 2801 2802 /* Set new name from original perf_probe_event and namelist */ 2803 static int probe_trace_event__set_name(struct probe_trace_event *tev, 2804 struct perf_probe_event *pev, 2805 struct strlist *namelist, 2806 bool allow_suffix) 2807 { 2808 const char *event, *group; 2809 char buf[64]; 2810 int ret; 2811 2812 /* If probe_event or trace_event already have the name, reuse it */ 2813 if (pev->event && !pev->sdt) 2814 event = pev->event; 2815 else if (tev->event) 2816 event = tev->event; 2817 else { 2818 /* Or generate new one from probe point */ 2819 if (pev->point.function && 2820 (strncmp(pev->point.function, "0x", 2) != 0) && 2821 !strisglob(pev->point.function)) 2822 event = pev->point.function; 2823 else 2824 event = tev->point.realname; 2825 } 2826 if (pev->group && !pev->sdt) 2827 group = pev->group; 2828 else if (tev->group) 2829 group = tev->group; 2830 else 2831 group = PERFPROBE_GROUP; 2832 2833 /* Get an unused new event name */ 2834 ret = get_new_event_name(buf, 64, event, namelist, 2835 tev->point.retprobe, allow_suffix); 2836 if (ret < 0) 2837 return ret; 2838 2839 event = buf; 2840 2841 tev->event = strdup(event); 2842 tev->group = strdup(group); 2843 if (tev->event == NULL || tev->group == NULL) 2844 return -ENOMEM; 2845 2846 /* 2847 * Add new event name to namelist if multiprobe event is NOT 2848 * supported, since we have to use new event name for following 2849 * probes in that case. 2850 */ 2851 if (!multiprobe_event_is_supported()) 2852 strlist__add(namelist, event); 2853 return 0; 2854 } 2855 2856 static int __open_probe_file_and_namelist(bool uprobe, 2857 struct strlist **namelist) 2858 { 2859 int fd; 2860 2861 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); 2862 if (fd < 0) 2863 return fd; 2864 2865 /* Get current event names */ 2866 *namelist = probe_file__get_namelist(fd); 2867 if (!(*namelist)) { 2868 pr_debug("Failed to get current event list.\n"); 2869 close(fd); 2870 return -ENOMEM; 2871 } 2872 return fd; 2873 } 2874 2875 static int __add_probe_trace_events(struct perf_probe_event *pev, 2876 struct probe_trace_event *tevs, 2877 int ntevs, bool allow_suffix) 2878 { 2879 int i, fd[2] = {-1, -1}, up, ret; 2880 struct probe_trace_event *tev = NULL; 2881 struct probe_cache *cache = NULL; 2882 struct strlist *namelist[2] = {NULL, NULL}; 2883 struct nscookie nsc; 2884 2885 up = pev->uprobes ? 1 : 0; 2886 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); 2887 if (fd[up] < 0) 2888 return fd[up]; 2889 2890 ret = 0; 2891 for (i = 0; i < ntevs; i++) { 2892 tev = &tevs[i]; 2893 up = tev->uprobes ? 1 : 0; 2894 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ 2895 fd[up] = __open_probe_file_and_namelist(up, 2896 &namelist[up]); 2897 if (fd[up] < 0) 2898 goto close_out; 2899 } 2900 /* Skip if the symbol is out of .text or blacklisted */ 2901 if (!tev->point.symbol && !pev->uprobes) 2902 continue; 2903 2904 /* Set new name for tev (and update namelist) */ 2905 ret = probe_trace_event__set_name(tev, pev, namelist[up], 2906 allow_suffix); 2907 if (ret < 0) 2908 break; 2909 2910 nsinfo__mountns_enter(pev->nsi, &nsc); 2911 ret = probe_file__add_event(fd[up], tev); 2912 nsinfo__mountns_exit(&nsc); 2913 if (ret < 0) 2914 break; 2915 2916 /* 2917 * Probes after the first probe which comes from same 2918 * user input are always allowed to add suffix, because 2919 * there might be several addresses corresponding to 2920 * one code line. 2921 */ 2922 allow_suffix = true; 2923 } 2924 if (ret == -EINVAL && pev->uprobes) 2925 warn_uprobe_event_compat(tev); 2926 if (ret == 0 && probe_conf.cache) { 2927 cache = probe_cache__new(pev->target, pev->nsi); 2928 if (!cache || 2929 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || 2930 probe_cache__commit(cache) < 0) 2931 pr_warning("Failed to add event to probe cache\n"); 2932 probe_cache__delete(cache); 2933 } 2934 2935 close_out: 2936 for (up = 0; up < 2; up++) { 2937 strlist__delete(namelist[up]); 2938 if (fd[up] >= 0) 2939 close(fd[up]); 2940 } 2941 return ret; 2942 } 2943 2944 static int find_probe_functions(struct map *map, char *name, 2945 struct symbol **syms) 2946 { 2947 int found = 0; 2948 struct symbol *sym; 2949 struct rb_node *tmp; 2950 const char *norm, *ver; 2951 char *buf = NULL; 2952 bool cut_version = true; 2953 2954 if (map__load(map) < 0) 2955 return -EACCES; /* Possible permission error to load symbols */ 2956 2957 /* If user gives a version, don't cut off the version from symbols */ 2958 if (strchr(name, '@')) 2959 cut_version = false; 2960 2961 map__for_each_symbol(map, sym, tmp) { 2962 norm = arch__normalize_symbol_name(sym->name); 2963 if (!norm) 2964 continue; 2965 2966 if (cut_version) { 2967 /* We don't care about default symbol or not */ 2968 ver = strchr(norm, '@'); 2969 if (ver) { 2970 buf = strndup(norm, ver - norm); 2971 if (!buf) 2972 return -ENOMEM; 2973 norm = buf; 2974 } 2975 } 2976 2977 if (strglobmatch(norm, name)) { 2978 found++; 2979 if (syms && found < probe_conf.max_probes) 2980 syms[found - 1] = sym; 2981 } 2982 if (buf) 2983 zfree(&buf); 2984 } 2985 2986 return found; 2987 } 2988 2989 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, 2990 struct probe_trace_event *tev __maybe_unused, 2991 struct map *map __maybe_unused, 2992 struct symbol *sym __maybe_unused) { } 2993 2994 2995 static void pr_kallsyms_access_error(void) 2996 { 2997 pr_err("Please ensure you can read the /proc/kallsyms symbol addresses.\n" 2998 "If /proc/sys/kernel/kptr_restrict is '2', you can not read\n" 2999 "kernel symbol addresses even if you are a superuser. Please change\n" 3000 "it to '1'. If kptr_restrict is '1', the superuser can read the\n" 3001 "symbol addresses.\n" 3002 "In that case, please run this command again with sudo.\n"); 3003 } 3004 3005 /* 3006 * Find probe function addresses from map. 3007 * Return an error or the number of found probe_trace_event 3008 */ 3009 static int find_probe_trace_events_from_map(struct perf_probe_event *pev, 3010 struct probe_trace_event **tevs) 3011 { 3012 struct map *map = NULL; 3013 struct ref_reloc_sym *reloc_sym = NULL; 3014 struct symbol *sym; 3015 struct symbol **syms = NULL; 3016 struct probe_trace_event *tev; 3017 struct perf_probe_point *pp = &pev->point; 3018 struct probe_trace_point *tp; 3019 int num_matched_functions; 3020 int ret, i, j, skipped = 0; 3021 char *mod_name; 3022 3023 map = get_target_map(pev->target, pev->nsi, pev->uprobes); 3024 if (!map) { 3025 ret = -EINVAL; 3026 goto out; 3027 } 3028 3029 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); 3030 if (!syms) { 3031 ret = -ENOMEM; 3032 goto out; 3033 } 3034 3035 /* 3036 * Load matched symbols: Since the different local symbols may have 3037 * same name but different addresses, this lists all the symbols. 3038 */ 3039 num_matched_functions = find_probe_functions(map, pp->function, syms); 3040 if (num_matched_functions <= 0) { 3041 if (num_matched_functions == -EACCES) { 3042 pr_err("Failed to load symbols from %s\n", 3043 pev->target ?: "/proc/kallsyms"); 3044 if (pev->target) 3045 pr_err("Please ensure the file is not stripped.\n"); 3046 else 3047 pr_kallsyms_access_error(); 3048 } else 3049 pr_err("Failed to find symbol %s in %s\n", pp->function, 3050 pev->target ? : "kernel"); 3051 ret = -ENOENT; 3052 goto out; 3053 } else if (num_matched_functions > probe_conf.max_probes) { 3054 pr_err("Too many functions matched in %s\n", 3055 pev->target ? : "kernel"); 3056 ret = -E2BIG; 3057 goto out; 3058 } 3059 3060 /* Note that the symbols in the kmodule are not relocated */ 3061 if (!pev->uprobes && !pev->target && 3062 (!pp->retprobe || kretprobe_offset_is_supported())) { 3063 reloc_sym = kernel_get_ref_reloc_sym(NULL); 3064 if (!reloc_sym) { 3065 pr_warning("Relocated base symbol is not found! " 3066 "Check /proc/sys/kernel/kptr_restrict\n" 3067 "and /proc/sys/kernel/perf_event_paranoid. " 3068 "Or run as privileged perf user.\n\n"); 3069 ret = -EINVAL; 3070 goto out; 3071 } 3072 } 3073 3074 /* Setup result trace-probe-events */ 3075 *tevs = zalloc(sizeof(*tev) * num_matched_functions); 3076 if (!*tevs) { 3077 ret = -ENOMEM; 3078 goto out; 3079 } 3080 3081 ret = 0; 3082 3083 for (j = 0; j < num_matched_functions; j++) { 3084 sym = syms[j]; 3085 3086 if (sym->type != STT_FUNC) 3087 continue; 3088 3089 /* There can be duplicated symbols in the map */ 3090 for (i = 0; i < j; i++) 3091 if (sym->start == syms[i]->start) { 3092 pr_debug("Found duplicated symbol %s @ %" PRIx64 "\n", 3093 sym->name, sym->start); 3094 break; 3095 } 3096 if (i != j) 3097 continue; 3098 3099 tev = (*tevs) + ret; 3100 tp = &tev->point; 3101 if (ret == num_matched_functions) { 3102 pr_warning("Too many symbols are listed. Skip it.\n"); 3103 break; 3104 } 3105 ret++; 3106 3107 if (pp->offset > sym->end - sym->start) { 3108 pr_warning("Offset %ld is bigger than the size of %s\n", 3109 pp->offset, sym->name); 3110 ret = -ENOENT; 3111 goto err_out; 3112 } 3113 /* Add one probe point */ 3114 tp->address = map->unmap_ip(map, sym->start) + pp->offset; 3115 3116 /* Check the kprobe (not in module) is within .text */ 3117 if (!pev->uprobes && !pev->target && 3118 kprobe_warn_out_range(sym->name, tp->address)) { 3119 tp->symbol = NULL; /* Skip it */ 3120 skipped++; 3121 } else if (reloc_sym) { 3122 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); 3123 tp->offset = tp->address - reloc_sym->addr; 3124 } else { 3125 tp->symbol = strdup_or_goto(sym->name, nomem_out); 3126 tp->offset = pp->offset; 3127 } 3128 tp->realname = strdup_or_goto(sym->name, nomem_out); 3129 3130 tp->retprobe = pp->retprobe; 3131 if (pev->target) { 3132 if (pev->uprobes) { 3133 tev->point.module = strdup_or_goto(pev->target, 3134 nomem_out); 3135 } else { 3136 mod_name = find_module_name(pev->target); 3137 tev->point.module = 3138 strdup(mod_name ? mod_name : pev->target); 3139 free(mod_name); 3140 if (!tev->point.module) 3141 goto nomem_out; 3142 } 3143 } 3144 tev->uprobes = pev->uprobes; 3145 tev->nargs = pev->nargs; 3146 if (tev->nargs) { 3147 tev->args = zalloc(sizeof(struct probe_trace_arg) * 3148 tev->nargs); 3149 if (tev->args == NULL) 3150 goto nomem_out; 3151 } 3152 for (i = 0; i < tev->nargs; i++) { 3153 if (pev->args[i].name) 3154 tev->args[i].name = 3155 strdup_or_goto(pev->args[i].name, 3156 nomem_out); 3157 3158 tev->args[i].value = strdup_or_goto(pev->args[i].var, 3159 nomem_out); 3160 if (pev->args[i].type) 3161 tev->args[i].type = 3162 strdup_or_goto(pev->args[i].type, 3163 nomem_out); 3164 } 3165 arch__fix_tev_from_maps(pev, tev, map, sym); 3166 } 3167 if (ret == skipped) { 3168 ret = -ENOENT; 3169 goto err_out; 3170 } 3171 3172 out: 3173 map__put(map); 3174 free(syms); 3175 return ret; 3176 3177 nomem_out: 3178 ret = -ENOMEM; 3179 err_out: 3180 clear_probe_trace_events(*tevs, num_matched_functions); 3181 zfree(tevs); 3182 goto out; 3183 } 3184 3185 static int try_to_find_absolute_address(struct perf_probe_event *pev, 3186 struct probe_trace_event **tevs) 3187 { 3188 struct perf_probe_point *pp = &pev->point; 3189 struct probe_trace_event *tev; 3190 struct probe_trace_point *tp; 3191 int i, err; 3192 3193 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) 3194 return -EINVAL; 3195 if (perf_probe_event_need_dwarf(pev)) 3196 return -EINVAL; 3197 3198 /* 3199 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at 3200 * absolute address. 3201 * 3202 * Only one tev can be generated by this. 3203 */ 3204 *tevs = zalloc(sizeof(*tev)); 3205 if (!*tevs) 3206 return -ENOMEM; 3207 3208 tev = *tevs; 3209 tp = &tev->point; 3210 3211 /* 3212 * Don't use tp->offset, use address directly, because 3213 * in synthesize_probe_trace_command() address cannot be 3214 * zero. 3215 */ 3216 tp->address = pev->point.abs_address; 3217 tp->retprobe = pp->retprobe; 3218 tev->uprobes = pev->uprobes; 3219 3220 err = -ENOMEM; 3221 /* 3222 * Give it a '0x' leading symbol name. 3223 * In __add_probe_trace_events, a NULL symbol is interpreted as 3224 * invalid. 3225 */ 3226 if (asprintf(&tp->symbol, "0x%" PRIx64, tp->address) < 0) 3227 goto errout; 3228 3229 /* For kprobe, check range */ 3230 if ((!tev->uprobes) && 3231 (kprobe_warn_out_range(tev->point.symbol, 3232 tev->point.address))) { 3233 err = -EACCES; 3234 goto errout; 3235 } 3236 3237 if (asprintf(&tp->realname, "abs_%" PRIx64, tp->address) < 0) 3238 goto errout; 3239 3240 if (pev->target) { 3241 tp->module = strdup(pev->target); 3242 if (!tp->module) 3243 goto errout; 3244 } 3245 3246 if (tev->group) { 3247 tev->group = strdup(pev->group); 3248 if (!tev->group) 3249 goto errout; 3250 } 3251 3252 if (pev->event) { 3253 tev->event = strdup(pev->event); 3254 if (!tev->event) 3255 goto errout; 3256 } 3257 3258 tev->nargs = pev->nargs; 3259 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 3260 if (!tev->args) 3261 goto errout; 3262 3263 for (i = 0; i < tev->nargs; i++) 3264 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); 3265 3266 return 1; 3267 3268 errout: 3269 clear_probe_trace_events(*tevs, 1); 3270 *tevs = NULL; 3271 return err; 3272 } 3273 3274 /* Concatenate two arrays */ 3275 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) 3276 { 3277 void *ret; 3278 3279 ret = malloc(sz_a + sz_b); 3280 if (ret) { 3281 memcpy(ret, a, sz_a); 3282 memcpy(ret + sz_a, b, sz_b); 3283 } 3284 return ret; 3285 } 3286 3287 static int 3288 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, 3289 struct probe_trace_event **tevs2, int ntevs2) 3290 { 3291 struct probe_trace_event *new_tevs; 3292 int ret = 0; 3293 3294 if (*ntevs == 0) { 3295 *tevs = *tevs2; 3296 *ntevs = ntevs2; 3297 *tevs2 = NULL; 3298 return 0; 3299 } 3300 3301 if (*ntevs + ntevs2 > probe_conf.max_probes) 3302 ret = -E2BIG; 3303 else { 3304 /* Concatenate the array of probe_trace_event */ 3305 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), 3306 *tevs2, ntevs2 * sizeof(**tevs2)); 3307 if (!new_tevs) 3308 ret = -ENOMEM; 3309 else { 3310 free(*tevs); 3311 *tevs = new_tevs; 3312 *ntevs += ntevs2; 3313 } 3314 } 3315 if (ret < 0) 3316 clear_probe_trace_events(*tevs2, ntevs2); 3317 zfree(tevs2); 3318 3319 return ret; 3320 } 3321 3322 /* 3323 * Try to find probe_trace_event from given probe caches. Return the number 3324 * of cached events found, if an error occurs return the error. 3325 */ 3326 static int find_cached_events(struct perf_probe_event *pev, 3327 struct probe_trace_event **tevs, 3328 const char *target) 3329 { 3330 struct probe_cache *cache; 3331 struct probe_cache_entry *entry; 3332 struct probe_trace_event *tmp_tevs = NULL; 3333 int ntevs = 0; 3334 int ret = 0; 3335 3336 cache = probe_cache__new(target, pev->nsi); 3337 /* Return 0 ("not found") if the target has no probe cache. */ 3338 if (!cache) 3339 return 0; 3340 3341 for_each_probe_cache_entry(entry, cache) { 3342 /* Skip the cache entry which has no name */ 3343 if (!entry->pev.event || !entry->pev.group) 3344 continue; 3345 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && 3346 strglobmatch(entry->pev.event, pev->event)) { 3347 ret = probe_cache_entry__get_event(entry, &tmp_tevs); 3348 if (ret > 0) 3349 ret = concat_probe_trace_events(tevs, &ntevs, 3350 &tmp_tevs, ret); 3351 if (ret < 0) 3352 break; 3353 } 3354 } 3355 probe_cache__delete(cache); 3356 if (ret < 0) { 3357 clear_probe_trace_events(*tevs, ntevs); 3358 zfree(tevs); 3359 } else { 3360 ret = ntevs; 3361 if (ntevs > 0 && target && target[0] == '/') 3362 pev->uprobes = true; 3363 } 3364 3365 return ret; 3366 } 3367 3368 /* Try to find probe_trace_event from all probe caches */ 3369 static int find_cached_events_all(struct perf_probe_event *pev, 3370 struct probe_trace_event **tevs) 3371 { 3372 struct probe_trace_event *tmp_tevs = NULL; 3373 struct strlist *bidlist; 3374 struct str_node *nd; 3375 char *pathname; 3376 int ntevs = 0; 3377 int ret; 3378 3379 /* Get the buildid list of all valid caches */ 3380 bidlist = build_id_cache__list_all(true); 3381 if (!bidlist) { 3382 ret = -errno; 3383 pr_debug("Failed to get buildids: %d\n", ret); 3384 return ret; 3385 } 3386 3387 ret = 0; 3388 strlist__for_each_entry(nd, bidlist) { 3389 pathname = build_id_cache__origname(nd->s); 3390 ret = find_cached_events(pev, &tmp_tevs, pathname); 3391 /* In the case of cnt == 0, we just skip it */ 3392 if (ret > 0) 3393 ret = concat_probe_trace_events(tevs, &ntevs, 3394 &tmp_tevs, ret); 3395 free(pathname); 3396 if (ret < 0) 3397 break; 3398 } 3399 strlist__delete(bidlist); 3400 3401 if (ret < 0) { 3402 clear_probe_trace_events(*tevs, ntevs); 3403 zfree(tevs); 3404 } else 3405 ret = ntevs; 3406 3407 return ret; 3408 } 3409 3410 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, 3411 struct probe_trace_event **tevs) 3412 { 3413 struct probe_cache *cache; 3414 struct probe_cache_entry *entry; 3415 struct probe_trace_event *tev; 3416 struct str_node *node; 3417 int ret, i; 3418 3419 if (pev->sdt) { 3420 /* For SDT/cached events, we use special search functions */ 3421 if (!pev->target) 3422 return find_cached_events_all(pev, tevs); 3423 else 3424 return find_cached_events(pev, tevs, pev->target); 3425 } 3426 cache = probe_cache__new(pev->target, pev->nsi); 3427 if (!cache) 3428 return 0; 3429 3430 entry = probe_cache__find(cache, pev); 3431 if (!entry) { 3432 /* SDT must be in the cache */ 3433 ret = pev->sdt ? -ENOENT : 0; 3434 goto out; 3435 } 3436 3437 ret = strlist__nr_entries(entry->tevlist); 3438 if (ret > probe_conf.max_probes) { 3439 pr_debug("Too many entries matched in the cache of %s\n", 3440 pev->target ? : "kernel"); 3441 ret = -E2BIG; 3442 goto out; 3443 } 3444 3445 *tevs = zalloc(ret * sizeof(*tev)); 3446 if (!*tevs) { 3447 ret = -ENOMEM; 3448 goto out; 3449 } 3450 3451 i = 0; 3452 strlist__for_each_entry(node, entry->tevlist) { 3453 tev = &(*tevs)[i++]; 3454 ret = parse_probe_trace_command(node->s, tev); 3455 if (ret < 0) 3456 goto out; 3457 /* Set the uprobes attribute as same as original */ 3458 tev->uprobes = pev->uprobes; 3459 } 3460 ret = i; 3461 3462 out: 3463 probe_cache__delete(cache); 3464 return ret; 3465 } 3466 3467 static int convert_to_probe_trace_events(struct perf_probe_event *pev, 3468 struct probe_trace_event **tevs) 3469 { 3470 int ret; 3471 3472 if (!pev->group && !pev->sdt) { 3473 /* Set group name if not given */ 3474 if (!pev->uprobes) { 3475 pev->group = strdup(PERFPROBE_GROUP); 3476 ret = pev->group ? 0 : -ENOMEM; 3477 } else 3478 ret = convert_exec_to_group(pev->target, &pev->group); 3479 if (ret != 0) { 3480 pr_warning("Failed to make a group name.\n"); 3481 return ret; 3482 } 3483 } 3484 3485 ret = try_to_find_absolute_address(pev, tevs); 3486 if (ret > 0) 3487 return ret; 3488 3489 /* At first, we need to lookup cache entry */ 3490 ret = find_probe_trace_events_from_cache(pev, tevs); 3491 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ 3492 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ 3493 3494 /* Convert perf_probe_event with debuginfo */ 3495 ret = try_to_find_probe_trace_events(pev, tevs); 3496 if (ret != 0) 3497 return ret; /* Found in debuginfo or got an error */ 3498 3499 return find_probe_trace_events_from_map(pev, tevs); 3500 } 3501 3502 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3503 { 3504 int i, ret; 3505 3506 /* Loop 1: convert all events */ 3507 for (i = 0; i < npevs; i++) { 3508 /* Init kprobe blacklist if needed */ 3509 if (!pevs[i].uprobes) 3510 kprobe_blacklist__init(); 3511 /* Convert with or without debuginfo */ 3512 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); 3513 if (ret < 0) 3514 return ret; 3515 pevs[i].ntevs = ret; 3516 } 3517 /* This just release blacklist only if allocated */ 3518 kprobe_blacklist__release(); 3519 3520 return 0; 3521 } 3522 3523 static int show_probe_trace_event(struct probe_trace_event *tev) 3524 { 3525 char *buf = synthesize_probe_trace_command(tev); 3526 3527 if (!buf) { 3528 pr_debug("Failed to synthesize probe trace event.\n"); 3529 return -EINVAL; 3530 } 3531 3532 /* Showing definition always go stdout */ 3533 printf("%s\n", buf); 3534 free(buf); 3535 3536 return 0; 3537 } 3538 3539 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) 3540 { 3541 struct strlist *namelist = strlist__new(NULL, NULL); 3542 struct probe_trace_event *tev; 3543 struct perf_probe_event *pev; 3544 int i, j, ret = 0; 3545 3546 if (!namelist) 3547 return -ENOMEM; 3548 3549 for (j = 0; j < npevs && !ret; j++) { 3550 pev = &pevs[j]; 3551 for (i = 0; i < pev->ntevs && !ret; i++) { 3552 tev = &pev->tevs[i]; 3553 /* Skip if the symbol is out of .text or blacklisted */ 3554 if (!tev->point.symbol && !pev->uprobes) 3555 continue; 3556 3557 /* Set new name for tev (and update namelist) */ 3558 ret = probe_trace_event__set_name(tev, pev, 3559 namelist, true); 3560 if (!ret) 3561 ret = show_probe_trace_event(tev); 3562 } 3563 } 3564 strlist__delete(namelist); 3565 3566 return ret; 3567 } 3568 3569 static int show_bootconfig_event(struct probe_trace_event *tev) 3570 { 3571 struct probe_trace_point *tp = &tev->point; 3572 struct strbuf buf; 3573 char *ret = NULL; 3574 int err; 3575 3576 if (strbuf_init(&buf, 32) < 0) 3577 return -ENOMEM; 3578 3579 err = synthesize_kprobe_trace_def(tp, &buf); 3580 if (err >= 0) 3581 err = synthesize_probe_trace_args(tev, &buf); 3582 if (err >= 0) 3583 ret = strbuf_detach(&buf, NULL); 3584 strbuf_release(&buf); 3585 3586 if (ret) { 3587 printf("'%s'", ret); 3588 free(ret); 3589 } 3590 3591 return err; 3592 } 3593 3594 int show_bootconfig_events(struct perf_probe_event *pevs, int npevs) 3595 { 3596 struct strlist *namelist = strlist__new(NULL, NULL); 3597 struct probe_trace_event *tev; 3598 struct perf_probe_event *pev; 3599 char *cur_name = NULL; 3600 int i, j, ret = 0; 3601 3602 if (!namelist) 3603 return -ENOMEM; 3604 3605 for (j = 0; j < npevs && !ret; j++) { 3606 pev = &pevs[j]; 3607 if (pev->group && strcmp(pev->group, "probe")) 3608 pr_warning("WARN: Group name %s is ignored\n", pev->group); 3609 if (pev->uprobes) { 3610 pr_warning("ERROR: Bootconfig doesn't support uprobes\n"); 3611 ret = -EINVAL; 3612 break; 3613 } 3614 for (i = 0; i < pev->ntevs && !ret; i++) { 3615 tev = &pev->tevs[i]; 3616 /* Skip if the symbol is out of .text or blacklisted */ 3617 if (!tev->point.symbol && !pev->uprobes) 3618 continue; 3619 3620 /* Set new name for tev (and update namelist) */ 3621 ret = probe_trace_event__set_name(tev, pev, 3622 namelist, true); 3623 if (ret) 3624 break; 3625 3626 if (!cur_name || strcmp(cur_name, tev->event)) { 3627 printf("%sftrace.event.kprobes.%s.probe = ", 3628 cur_name ? "\n" : "", tev->event); 3629 cur_name = tev->event; 3630 } else 3631 printf(", "); 3632 ret = show_bootconfig_event(tev); 3633 } 3634 } 3635 printf("\n"); 3636 strlist__delete(namelist); 3637 3638 return ret; 3639 } 3640 3641 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3642 { 3643 int i, ret = 0; 3644 3645 /* Loop 2: add all events */ 3646 for (i = 0; i < npevs; i++) { 3647 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, 3648 pevs[i].ntevs, 3649 probe_conf.force_add); 3650 if (ret < 0) 3651 break; 3652 } 3653 return ret; 3654 } 3655 3656 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3657 { 3658 int i, j; 3659 struct perf_probe_event *pev; 3660 3661 /* Loop 3: cleanup and free trace events */ 3662 for (i = 0; i < npevs; i++) { 3663 pev = &pevs[i]; 3664 for (j = 0; j < pevs[i].ntevs; j++) 3665 clear_probe_trace_event(&pevs[i].tevs[j]); 3666 zfree(&pevs[i].tevs); 3667 pevs[i].ntevs = 0; 3668 nsinfo__zput(pev->nsi); 3669 clear_perf_probe_event(&pevs[i]); 3670 } 3671 } 3672 3673 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3674 { 3675 int ret; 3676 3677 ret = init_probe_symbol_maps(pevs->uprobes); 3678 if (ret < 0) 3679 return ret; 3680 3681 ret = convert_perf_probe_events(pevs, npevs); 3682 if (ret == 0) 3683 ret = apply_perf_probe_events(pevs, npevs); 3684 3685 cleanup_perf_probe_events(pevs, npevs); 3686 3687 exit_probe_symbol_maps(); 3688 return ret; 3689 } 3690 3691 int del_perf_probe_events(struct strfilter *filter) 3692 { 3693 int ret, ret2, ufd = -1, kfd = -1; 3694 char *str = strfilter__string(filter); 3695 3696 if (!str) 3697 return -EINVAL; 3698 3699 /* Get current event names */ 3700 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); 3701 if (ret < 0) 3702 goto out; 3703 3704 ret = probe_file__del_events(kfd, filter); 3705 if (ret < 0 && ret != -ENOENT) 3706 goto error; 3707 3708 ret2 = probe_file__del_events(ufd, filter); 3709 if (ret2 < 0 && ret2 != -ENOENT) { 3710 ret = ret2; 3711 goto error; 3712 } 3713 ret = 0; 3714 3715 error: 3716 if (kfd >= 0) 3717 close(kfd); 3718 if (ufd >= 0) 3719 close(ufd); 3720 out: 3721 free(str); 3722 3723 return ret; 3724 } 3725 3726 int show_available_funcs(const char *target, struct nsinfo *nsi, 3727 struct strfilter *_filter, bool user) 3728 { 3729 struct rb_node *nd; 3730 struct map *map; 3731 int ret; 3732 3733 ret = init_probe_symbol_maps(user); 3734 if (ret < 0) 3735 return ret; 3736 3737 /* Get a symbol map */ 3738 map = get_target_map(target, nsi, user); 3739 if (!map) { 3740 pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); 3741 return -EINVAL; 3742 } 3743 3744 ret = map__load(map); 3745 if (ret) { 3746 if (ret == -2) { 3747 char *str = strfilter__string(_filter); 3748 pr_err("Failed to find symbols matched to \"%s\"\n", 3749 str); 3750 free(str); 3751 } else 3752 pr_err("Failed to load symbols in %s\n", 3753 (target) ? : "kernel"); 3754 goto end; 3755 } 3756 if (!dso__sorted_by_name(map->dso)) 3757 dso__sort_by_name(map->dso); 3758 3759 /* Show all (filtered) symbols */ 3760 setup_pager(); 3761 3762 for (nd = rb_first_cached(&map->dso->symbol_names); nd; 3763 nd = rb_next(nd)) { 3764 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 3765 3766 if (strfilter__compare(_filter, pos->sym.name)) 3767 printf("%s\n", pos->sym.name); 3768 } 3769 end: 3770 map__put(map); 3771 exit_probe_symbol_maps(); 3772 3773 return ret; 3774 } 3775 3776 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, 3777 struct perf_probe_arg *pvar) 3778 { 3779 tvar->value = strdup(pvar->var); 3780 if (tvar->value == NULL) 3781 return -ENOMEM; 3782 if (pvar->type) { 3783 tvar->type = strdup(pvar->type); 3784 if (tvar->type == NULL) 3785 return -ENOMEM; 3786 } 3787 if (pvar->name) { 3788 tvar->name = strdup(pvar->name); 3789 if (tvar->name == NULL) 3790 return -ENOMEM; 3791 } else 3792 tvar->name = NULL; 3793 return 0; 3794 } 3795