1 /* 2 * probe-event.c : perf-probe definition to probe_events format converter 3 * 4 * Written by Masami Hiramatsu <mhiramat@redhat.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 */ 21 22 #include <inttypes.h> 23 #include <sys/utsname.h> 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 #include <errno.h> 28 #include <stdio.h> 29 #include <unistd.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <stdarg.h> 33 #include <limits.h> 34 #include <elf.h> 35 36 #include "util.h" 37 #include "event.h" 38 #include "namespaces.h" 39 #include "strlist.h" 40 #include "strfilter.h" 41 #include "debug.h" 42 #include "cache.h" 43 #include "color.h" 44 #include "map.h" 45 #include "map_groups.h" 46 #include "symbol.h" 47 #include "thread.h" 48 #include <api/fs/fs.h> 49 #include "trace-event.h" /* For __maybe_unused */ 50 #include "probe-event.h" 51 #include "probe-finder.h" 52 #include "probe-file.h" 53 #include "session.h" 54 #include "string2.h" 55 56 #include "sane_ctype.h" 57 58 #define PERFPROBE_GROUP "probe" 59 60 bool probe_event_dry_run; /* Dry run flag */ 61 struct probe_conf probe_conf; 62 63 #define semantic_error(msg ...) pr_err("Semantic error :" msg) 64 65 int e_snprintf(char *str, size_t size, const char *format, ...) 66 { 67 int ret; 68 va_list ap; 69 va_start(ap, format); 70 ret = vsnprintf(str, size, format, ap); 71 va_end(ap); 72 if (ret >= (int)size) 73 ret = -E2BIG; 74 return ret; 75 } 76 77 static struct machine *host_machine; 78 79 /* Initialize symbol maps and path of vmlinux/modules */ 80 int init_probe_symbol_maps(bool user_only) 81 { 82 int ret; 83 84 symbol_conf.sort_by_name = true; 85 symbol_conf.allow_aliases = true; 86 ret = symbol__init(NULL); 87 if (ret < 0) { 88 pr_debug("Failed to init symbol map.\n"); 89 goto out; 90 } 91 92 if (host_machine || user_only) /* already initialized */ 93 return 0; 94 95 if (symbol_conf.vmlinux_name) 96 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); 97 98 host_machine = machine__new_host(); 99 if (!host_machine) { 100 pr_debug("machine__new_host() failed.\n"); 101 symbol__exit(); 102 ret = -1; 103 } 104 out: 105 if (ret < 0) 106 pr_warning("Failed to init vmlinux path.\n"); 107 return ret; 108 } 109 110 void exit_probe_symbol_maps(void) 111 { 112 machine__delete(host_machine); 113 host_machine = NULL; 114 symbol__exit(); 115 } 116 117 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) 118 { 119 /* kmap->ref_reloc_sym should be set if host_machine is initialized */ 120 struct kmap *kmap; 121 struct map *map = machine__kernel_map(host_machine); 122 123 if (map__load(map) < 0) 124 return NULL; 125 126 kmap = map__kmap(map); 127 if (!kmap) 128 return NULL; 129 return kmap->ref_reloc_sym; 130 } 131 132 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, 133 bool reloc, bool reladdr) 134 { 135 struct ref_reloc_sym *reloc_sym; 136 struct symbol *sym; 137 struct map *map; 138 139 /* ref_reloc_sym is just a label. Need a special fix*/ 140 reloc_sym = kernel_get_ref_reloc_sym(); 141 if (reloc_sym && strcmp(name, reloc_sym->name) == 0) 142 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; 143 else { 144 sym = machine__find_kernel_symbol_by_name(host_machine, name, &map); 145 if (!sym) 146 return -ENOENT; 147 *addr = map->unmap_ip(map, sym->start) - 148 ((reloc) ? 0 : map->reloc) - 149 ((reladdr) ? map->start : 0); 150 } 151 return 0; 152 } 153 154 static struct map *kernel_get_module_map(const char *module) 155 { 156 struct maps *maps = machine__kernel_maps(host_machine); 157 struct map *pos; 158 159 /* A file path -- this is an offline module */ 160 if (module && strchr(module, '/')) 161 return dso__new_map(module); 162 163 if (!module) { 164 pos = machine__kernel_map(host_machine); 165 return map__get(pos); 166 } 167 168 for (pos = maps__first(maps); pos; pos = map__next(pos)) { 169 /* short_name is "[module]" */ 170 if (strncmp(pos->dso->short_name + 1, module, 171 pos->dso->short_name_len - 2) == 0 && 172 module[pos->dso->short_name_len - 2] == '\0') { 173 return map__get(pos); 174 } 175 } 176 return NULL; 177 } 178 179 struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) 180 { 181 /* Init maps of given executable or kernel */ 182 if (user) { 183 struct map *map; 184 185 map = dso__new_map(target); 186 if (map && map->dso) 187 map->dso->nsinfo = nsinfo__get(nsi); 188 return map; 189 } else { 190 return kernel_get_module_map(target); 191 } 192 } 193 194 static int convert_exec_to_group(const char *exec, char **result) 195 { 196 char *ptr1, *ptr2, *exec_copy; 197 char buf[64]; 198 int ret; 199 200 exec_copy = strdup(exec); 201 if (!exec_copy) 202 return -ENOMEM; 203 204 ptr1 = basename(exec_copy); 205 if (!ptr1) { 206 ret = -EINVAL; 207 goto out; 208 } 209 210 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { 211 if (!isalnum(*ptr2) && *ptr2 != '_') { 212 *ptr2 = '\0'; 213 break; 214 } 215 } 216 217 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); 218 if (ret < 0) 219 goto out; 220 221 *result = strdup(buf); 222 ret = *result ? 0 : -ENOMEM; 223 224 out: 225 free(exec_copy); 226 return ret; 227 } 228 229 static void clear_perf_probe_point(struct perf_probe_point *pp) 230 { 231 free(pp->file); 232 free(pp->function); 233 free(pp->lazy_line); 234 } 235 236 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) 237 { 238 int i; 239 240 for (i = 0; i < ntevs; i++) 241 clear_probe_trace_event(tevs + i); 242 } 243 244 static bool kprobe_blacklist__listed(unsigned long address); 245 static bool kprobe_warn_out_range(const char *symbol, unsigned long address) 246 { 247 u64 etext_addr = 0; 248 int ret; 249 250 /* Get the address of _etext for checking non-probable text symbol */ 251 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, 252 false, false); 253 254 if (ret == 0 && etext_addr < address) 255 pr_warning("%s is out of .text, skip it.\n", symbol); 256 else if (kprobe_blacklist__listed(address)) 257 pr_warning("%s is blacklisted function, skip it.\n", symbol); 258 else 259 return false; 260 261 return true; 262 } 263 264 /* 265 * @module can be module name of module file path. In case of path, 266 * inspect elf and find out what is actual module name. 267 * Caller has to free mod_name after using it. 268 */ 269 static char *find_module_name(const char *module) 270 { 271 int fd; 272 Elf *elf; 273 GElf_Ehdr ehdr; 274 GElf_Shdr shdr; 275 Elf_Data *data; 276 Elf_Scn *sec; 277 char *mod_name = NULL; 278 int name_offset; 279 280 fd = open(module, O_RDONLY); 281 if (fd < 0) 282 return NULL; 283 284 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 285 if (elf == NULL) 286 goto elf_err; 287 288 if (gelf_getehdr(elf, &ehdr) == NULL) 289 goto ret_err; 290 291 sec = elf_section_by_name(elf, &ehdr, &shdr, 292 ".gnu.linkonce.this_module", NULL); 293 if (!sec) 294 goto ret_err; 295 296 data = elf_getdata(sec, NULL); 297 if (!data || !data->d_buf) 298 goto ret_err; 299 300 /* 301 * NOTE: 302 * '.gnu.linkonce.this_module' section of kernel module elf directly 303 * maps to 'struct module' from linux/module.h. This section contains 304 * actual module name which will be used by kernel after loading it. 305 * But, we cannot use 'struct module' here since linux/module.h is not 306 * exposed to user-space. Offset of 'name' has remained same from long 307 * time, so hardcoding it here. 308 */ 309 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) 310 name_offset = 12; 311 else /* expect ELFCLASS64 by default */ 312 name_offset = 24; 313 314 mod_name = strdup((char *)data->d_buf + name_offset); 315 316 ret_err: 317 elf_end(elf); 318 elf_err: 319 close(fd); 320 return mod_name; 321 } 322 323 #ifdef HAVE_DWARF_SUPPORT 324 325 static int kernel_get_module_dso(const char *module, struct dso **pdso) 326 { 327 struct dso *dso; 328 struct map *map; 329 const char *vmlinux_name; 330 int ret = 0; 331 332 if (module) { 333 char module_name[128]; 334 335 snprintf(module_name, sizeof(module_name), "[%s]", module); 336 map = map_groups__find_by_name(&host_machine->kmaps, module_name); 337 if (map) { 338 dso = map->dso; 339 goto found; 340 } 341 pr_debug("Failed to find module %s.\n", module); 342 return -ENOENT; 343 } 344 345 map = machine__kernel_map(host_machine); 346 dso = map->dso; 347 348 vmlinux_name = symbol_conf.vmlinux_name; 349 dso->load_errno = 0; 350 if (vmlinux_name) 351 ret = dso__load_vmlinux(dso, map, vmlinux_name, false); 352 else 353 ret = dso__load_vmlinux_path(dso, map); 354 found: 355 *pdso = dso; 356 return ret; 357 } 358 359 /* 360 * Some binaries like glibc have special symbols which are on the symbol 361 * table, but not in the debuginfo. If we can find the address of the 362 * symbol from map, we can translate the address back to the probe point. 363 */ 364 static int find_alternative_probe_point(struct debuginfo *dinfo, 365 struct perf_probe_point *pp, 366 struct perf_probe_point *result, 367 const char *target, struct nsinfo *nsi, 368 bool uprobes) 369 { 370 struct map *map = NULL; 371 struct symbol *sym; 372 u64 address = 0; 373 int ret = -ENOENT; 374 375 /* This can work only for function-name based one */ 376 if (!pp->function || pp->file) 377 return -ENOTSUP; 378 379 map = get_target_map(target, nsi, uprobes); 380 if (!map) 381 return -EINVAL; 382 383 /* Find the address of given function */ 384 map__for_each_symbol_by_name(map, pp->function, sym) { 385 if (uprobes) 386 address = sym->start; 387 else 388 address = map->unmap_ip(map, sym->start) - map->reloc; 389 break; 390 } 391 if (!address) { 392 ret = -ENOENT; 393 goto out; 394 } 395 pr_debug("Symbol %s address found : %" PRIx64 "\n", 396 pp->function, address); 397 398 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, 399 result); 400 if (ret <= 0) 401 ret = (!ret) ? -ENOENT : ret; 402 else { 403 result->offset += pp->offset; 404 result->line += pp->line; 405 result->retprobe = pp->retprobe; 406 ret = 0; 407 } 408 409 out: 410 map__put(map); 411 return ret; 412 413 } 414 415 static int get_alternative_probe_event(struct debuginfo *dinfo, 416 struct perf_probe_event *pev, 417 struct perf_probe_point *tmp) 418 { 419 int ret; 420 421 memcpy(tmp, &pev->point, sizeof(*tmp)); 422 memset(&pev->point, 0, sizeof(pev->point)); 423 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, 424 pev->nsi, pev->uprobes); 425 if (ret < 0) 426 memcpy(&pev->point, tmp, sizeof(*tmp)); 427 428 return ret; 429 } 430 431 static int get_alternative_line_range(struct debuginfo *dinfo, 432 struct line_range *lr, 433 const char *target, bool user) 434 { 435 struct perf_probe_point pp = { .function = lr->function, 436 .file = lr->file, 437 .line = lr->start }; 438 struct perf_probe_point result; 439 int ret, len = 0; 440 441 memset(&result, 0, sizeof(result)); 442 443 if (lr->end != INT_MAX) 444 len = lr->end - lr->start; 445 ret = find_alternative_probe_point(dinfo, &pp, &result, 446 target, NULL, user); 447 if (!ret) { 448 lr->function = result.function; 449 lr->file = result.file; 450 lr->start = result.line; 451 if (lr->end != INT_MAX) 452 lr->end = lr->start + len; 453 clear_perf_probe_point(&pp); 454 } 455 return ret; 456 } 457 458 /* Open new debuginfo of given module */ 459 static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, 460 bool silent) 461 { 462 const char *path = module; 463 char reason[STRERR_BUFSIZE]; 464 struct debuginfo *ret = NULL; 465 struct dso *dso = NULL; 466 struct nscookie nsc; 467 int err; 468 469 if (!module || !strchr(module, '/')) { 470 err = kernel_get_module_dso(module, &dso); 471 if (err < 0) { 472 if (!dso || dso->load_errno == 0) { 473 if (!str_error_r(-err, reason, STRERR_BUFSIZE)) 474 strcpy(reason, "(unknown)"); 475 } else 476 dso__strerror_load(dso, reason, STRERR_BUFSIZE); 477 if (!silent) { 478 if (module) 479 pr_err("Module %s is not loaded, please specify its full path name.\n", module); 480 else 481 pr_err("Failed to find the path for the kernel: %s\n", reason); 482 } 483 return NULL; 484 } 485 path = dso->long_name; 486 } 487 nsinfo__mountns_enter(nsi, &nsc); 488 ret = debuginfo__new(path); 489 if (!ret && !silent) { 490 pr_warning("The %s file has no debug information.\n", path); 491 if (!module || !strtailcmp(path, ".ko")) 492 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); 493 else 494 pr_warning("Rebuild with -g, "); 495 pr_warning("or install an appropriate debuginfo package.\n"); 496 } 497 nsinfo__mountns_exit(&nsc); 498 return ret; 499 } 500 501 /* For caching the last debuginfo */ 502 static struct debuginfo *debuginfo_cache; 503 static char *debuginfo_cache_path; 504 505 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) 506 { 507 const char *path = module; 508 509 /* If the module is NULL, it should be the kernel. */ 510 if (!module) 511 path = "kernel"; 512 513 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) 514 goto out; 515 516 /* Copy module path */ 517 free(debuginfo_cache_path); 518 debuginfo_cache_path = strdup(path); 519 if (!debuginfo_cache_path) { 520 debuginfo__delete(debuginfo_cache); 521 debuginfo_cache = NULL; 522 goto out; 523 } 524 525 debuginfo_cache = open_debuginfo(module, NULL, silent); 526 if (!debuginfo_cache) 527 zfree(&debuginfo_cache_path); 528 out: 529 return debuginfo_cache; 530 } 531 532 static void debuginfo_cache__exit(void) 533 { 534 debuginfo__delete(debuginfo_cache); 535 debuginfo_cache = NULL; 536 zfree(&debuginfo_cache_path); 537 } 538 539 540 static int get_text_start_address(const char *exec, unsigned long *address, 541 struct nsinfo *nsi) 542 { 543 Elf *elf; 544 GElf_Ehdr ehdr; 545 GElf_Shdr shdr; 546 int fd, ret = -ENOENT; 547 struct nscookie nsc; 548 549 nsinfo__mountns_enter(nsi, &nsc); 550 fd = open(exec, O_RDONLY); 551 nsinfo__mountns_exit(&nsc); 552 if (fd < 0) 553 return -errno; 554 555 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 556 if (elf == NULL) { 557 ret = -EINVAL; 558 goto out_close; 559 } 560 561 if (gelf_getehdr(elf, &ehdr) == NULL) 562 goto out; 563 564 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) 565 goto out; 566 567 *address = shdr.sh_addr - shdr.sh_offset; 568 ret = 0; 569 out: 570 elf_end(elf); 571 out_close: 572 close(fd); 573 574 return ret; 575 } 576 577 /* 578 * Convert trace point to probe point with debuginfo 579 */ 580 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, 581 struct perf_probe_point *pp, 582 bool is_kprobe) 583 { 584 struct debuginfo *dinfo = NULL; 585 unsigned long stext = 0; 586 u64 addr = tp->address; 587 int ret = -ENOENT; 588 589 /* convert the address to dwarf address */ 590 if (!is_kprobe) { 591 if (!addr) { 592 ret = -EINVAL; 593 goto error; 594 } 595 ret = get_text_start_address(tp->module, &stext, NULL); 596 if (ret < 0) 597 goto error; 598 addr += stext; 599 } else if (tp->symbol) { 600 /* If the module is given, this returns relative address */ 601 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, 602 false, !!tp->module); 603 if (ret != 0) 604 goto error; 605 addr += tp->offset; 606 } 607 608 pr_debug("try to find information at %" PRIx64 " in %s\n", addr, 609 tp->module ? : "kernel"); 610 611 dinfo = debuginfo_cache__open(tp->module, verbose <= 0); 612 if (dinfo) 613 ret = debuginfo__find_probe_point(dinfo, 614 (unsigned long)addr, pp); 615 else 616 ret = -ENOENT; 617 618 if (ret > 0) { 619 pp->retprobe = tp->retprobe; 620 return 0; 621 } 622 error: 623 pr_debug("Failed to find corresponding probes from debuginfo.\n"); 624 return ret ? : -ENOENT; 625 } 626 627 /* Adjust symbol name and address */ 628 static int post_process_probe_trace_point(struct probe_trace_point *tp, 629 struct map *map, unsigned long offs) 630 { 631 struct symbol *sym; 632 u64 addr = tp->address - offs; 633 634 sym = map__find_symbol(map, addr); 635 if (!sym) 636 return -ENOENT; 637 638 if (strcmp(sym->name, tp->symbol)) { 639 /* If we have no realname, use symbol for it */ 640 if (!tp->realname) 641 tp->realname = tp->symbol; 642 else 643 free(tp->symbol); 644 tp->symbol = strdup(sym->name); 645 if (!tp->symbol) 646 return -ENOMEM; 647 } 648 tp->offset = addr - sym->start; 649 tp->address -= offs; 650 651 return 0; 652 } 653 654 /* 655 * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions 656 * and generate new symbols with suffixes such as .constprop.N or .isra.N 657 * etc. Since those symbols are not recorded in DWARF, we have to find 658 * correct generated symbols from offline ELF binary. 659 * For online kernel or uprobes we don't need this because those are 660 * rebased on _text, or already a section relative address. 661 */ 662 static int 663 post_process_offline_probe_trace_events(struct probe_trace_event *tevs, 664 int ntevs, const char *pathname) 665 { 666 struct map *map; 667 unsigned long stext = 0; 668 int i, ret = 0; 669 670 /* Prepare a map for offline binary */ 671 map = dso__new_map(pathname); 672 if (!map || get_text_start_address(pathname, &stext, NULL) < 0) { 673 pr_warning("Failed to get ELF symbols for %s\n", pathname); 674 return -EINVAL; 675 } 676 677 for (i = 0; i < ntevs; i++) { 678 ret = post_process_probe_trace_point(&tevs[i].point, 679 map, stext); 680 if (ret < 0) 681 break; 682 } 683 map__put(map); 684 685 return ret; 686 } 687 688 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, 689 int ntevs, const char *exec, 690 struct nsinfo *nsi) 691 { 692 int i, ret = 0; 693 unsigned long stext = 0; 694 695 if (!exec) 696 return 0; 697 698 ret = get_text_start_address(exec, &stext, nsi); 699 if (ret < 0) 700 return ret; 701 702 for (i = 0; i < ntevs && ret >= 0; i++) { 703 /* point.address is the address of point.symbol + point.offset */ 704 tevs[i].point.address -= stext; 705 tevs[i].point.module = strdup(exec); 706 if (!tevs[i].point.module) { 707 ret = -ENOMEM; 708 break; 709 } 710 tevs[i].uprobes = true; 711 } 712 713 return ret; 714 } 715 716 static int 717 post_process_module_probe_trace_events(struct probe_trace_event *tevs, 718 int ntevs, const char *module, 719 struct debuginfo *dinfo) 720 { 721 Dwarf_Addr text_offs = 0; 722 int i, ret = 0; 723 char *mod_name = NULL; 724 struct map *map; 725 726 if (!module) 727 return 0; 728 729 map = get_target_map(module, NULL, false); 730 if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) { 731 pr_warning("Failed to get ELF symbols for %s\n", module); 732 return -EINVAL; 733 } 734 735 mod_name = find_module_name(module); 736 for (i = 0; i < ntevs; i++) { 737 ret = post_process_probe_trace_point(&tevs[i].point, 738 map, (unsigned long)text_offs); 739 if (ret < 0) 740 break; 741 tevs[i].point.module = 742 strdup(mod_name ? mod_name : module); 743 if (!tevs[i].point.module) { 744 ret = -ENOMEM; 745 break; 746 } 747 } 748 749 free(mod_name); 750 map__put(map); 751 752 return ret; 753 } 754 755 static int 756 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, 757 int ntevs) 758 { 759 struct ref_reloc_sym *reloc_sym; 760 char *tmp; 761 int i, skipped = 0; 762 763 /* Skip post process if the target is an offline kernel */ 764 if (symbol_conf.ignore_vmlinux_buildid) 765 return post_process_offline_probe_trace_events(tevs, ntevs, 766 symbol_conf.vmlinux_name); 767 768 reloc_sym = kernel_get_ref_reloc_sym(); 769 if (!reloc_sym) { 770 pr_warning("Relocated base symbol is not found!\n"); 771 return -EINVAL; 772 } 773 774 for (i = 0; i < ntevs; i++) { 775 if (!tevs[i].point.address) 776 continue; 777 if (tevs[i].point.retprobe && !kretprobe_offset_is_supported()) 778 continue; 779 /* If we found a wrong one, mark it by NULL symbol */ 780 if (kprobe_warn_out_range(tevs[i].point.symbol, 781 tevs[i].point.address)) { 782 tmp = NULL; 783 skipped++; 784 } else { 785 tmp = strdup(reloc_sym->name); 786 if (!tmp) 787 return -ENOMEM; 788 } 789 /* If we have no realname, use symbol for it */ 790 if (!tevs[i].point.realname) 791 tevs[i].point.realname = tevs[i].point.symbol; 792 else 793 free(tevs[i].point.symbol); 794 tevs[i].point.symbol = tmp; 795 tevs[i].point.offset = tevs[i].point.address - 796 reloc_sym->unrelocated_addr; 797 } 798 return skipped; 799 } 800 801 void __weak 802 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, 803 int ntevs __maybe_unused) 804 { 805 } 806 807 /* Post processing the probe events */ 808 static int post_process_probe_trace_events(struct perf_probe_event *pev, 809 struct probe_trace_event *tevs, 810 int ntevs, const char *module, 811 bool uprobe, struct debuginfo *dinfo) 812 { 813 int ret; 814 815 if (uprobe) 816 ret = add_exec_to_probe_trace_events(tevs, ntevs, module, 817 pev->nsi); 818 else if (module) 819 /* Currently ref_reloc_sym based probe is not for drivers */ 820 ret = post_process_module_probe_trace_events(tevs, ntevs, 821 module, dinfo); 822 else 823 ret = post_process_kernel_probe_trace_events(tevs, ntevs); 824 825 if (ret >= 0) 826 arch__post_process_probe_trace_events(pev, ntevs); 827 828 return ret; 829 } 830 831 /* Try to find perf_probe_event with debuginfo */ 832 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 833 struct probe_trace_event **tevs) 834 { 835 bool need_dwarf = perf_probe_event_need_dwarf(pev); 836 struct perf_probe_point tmp; 837 struct debuginfo *dinfo; 838 int ntevs, ret = 0; 839 840 dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf); 841 if (!dinfo) { 842 if (need_dwarf) 843 return -ENOENT; 844 pr_debug("Could not open debuginfo. Try to use symbols.\n"); 845 return 0; 846 } 847 848 pr_debug("Try to find probe point from debuginfo.\n"); 849 /* Searching trace events corresponding to a probe event */ 850 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 851 852 if (ntevs == 0) { /* Not found, retry with an alternative */ 853 ret = get_alternative_probe_event(dinfo, pev, &tmp); 854 if (!ret) { 855 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 856 /* 857 * Write back to the original probe_event for 858 * setting appropriate (user given) event name 859 */ 860 clear_perf_probe_point(&pev->point); 861 memcpy(&pev->point, &tmp, sizeof(tmp)); 862 } 863 } 864 865 if (ntevs > 0) { /* Succeeded to find trace events */ 866 pr_debug("Found %d probe_trace_events.\n", ntevs); 867 ret = post_process_probe_trace_events(pev, *tevs, ntevs, 868 pev->target, pev->uprobes, dinfo); 869 if (ret < 0 || ret == ntevs) { 870 pr_debug("Post processing failed or all events are skipped. (%d)\n", ret); 871 clear_probe_trace_events(*tevs, ntevs); 872 zfree(tevs); 873 ntevs = 0; 874 } 875 } 876 877 debuginfo__delete(dinfo); 878 879 if (ntevs == 0) { /* No error but failed to find probe point. */ 880 pr_warning("Probe point '%s' not found.\n", 881 synthesize_perf_probe_point(&pev->point)); 882 return -ENOENT; 883 } else if (ntevs < 0) { 884 /* Error path : ntevs < 0 */ 885 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); 886 if (ntevs == -EBADF) 887 pr_warning("Warning: No dwarf info found in the vmlinux - " 888 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); 889 if (!need_dwarf) { 890 pr_debug("Trying to use symbols.\n"); 891 return 0; 892 } 893 } 894 return ntevs; 895 } 896 897 #define LINEBUF_SIZE 256 898 #define NR_ADDITIONAL_LINES 2 899 900 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) 901 { 902 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; 903 const char *color = show_num ? "" : PERF_COLOR_BLUE; 904 const char *prefix = NULL; 905 906 do { 907 if (fgets(buf, LINEBUF_SIZE, fp) == NULL) 908 goto error; 909 if (skip) 910 continue; 911 if (!prefix) { 912 prefix = show_num ? "%7d " : " "; 913 color_fprintf(stdout, color, prefix, l); 914 } 915 color_fprintf(stdout, color, "%s", buf); 916 917 } while (strchr(buf, '\n') == NULL); 918 919 return 1; 920 error: 921 if (ferror(fp)) { 922 pr_warning("File read error: %s\n", 923 str_error_r(errno, sbuf, sizeof(sbuf))); 924 return -1; 925 } 926 return 0; 927 } 928 929 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) 930 { 931 int rv = __show_one_line(fp, l, skip, show_num); 932 if (rv == 0) { 933 pr_warning("Source file is shorter than expected.\n"); 934 rv = -1; 935 } 936 return rv; 937 } 938 939 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) 940 #define show_one_line(f,l) _show_one_line(f,l,false,false) 941 #define skip_one_line(f,l) _show_one_line(f,l,true,false) 942 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) 943 944 /* 945 * Show line-range always requires debuginfo to find source file and 946 * line number. 947 */ 948 static int __show_line_range(struct line_range *lr, const char *module, 949 bool user) 950 { 951 int l = 1; 952 struct int_node *ln; 953 struct debuginfo *dinfo; 954 FILE *fp; 955 int ret; 956 char *tmp; 957 char sbuf[STRERR_BUFSIZE]; 958 959 /* Search a line range */ 960 dinfo = open_debuginfo(module, NULL, false); 961 if (!dinfo) 962 return -ENOENT; 963 964 ret = debuginfo__find_line_range(dinfo, lr); 965 if (!ret) { /* Not found, retry with an alternative */ 966 ret = get_alternative_line_range(dinfo, lr, module, user); 967 if (!ret) 968 ret = debuginfo__find_line_range(dinfo, lr); 969 } 970 debuginfo__delete(dinfo); 971 if (ret == 0 || ret == -ENOENT) { 972 pr_warning("Specified source line is not found.\n"); 973 return -ENOENT; 974 } else if (ret < 0) { 975 pr_warning("Debuginfo analysis failed.\n"); 976 return ret; 977 } 978 979 /* Convert source file path */ 980 tmp = lr->path; 981 ret = get_real_path(tmp, lr->comp_dir, &lr->path); 982 983 /* Free old path when new path is assigned */ 984 if (tmp != lr->path) 985 free(tmp); 986 987 if (ret < 0) { 988 pr_warning("Failed to find source file path.\n"); 989 return ret; 990 } 991 992 setup_pager(); 993 994 if (lr->function) 995 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, 996 lr->start - lr->offset); 997 else 998 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); 999 1000 fp = fopen(lr->path, "r"); 1001 if (fp == NULL) { 1002 pr_warning("Failed to open %s: %s\n", lr->path, 1003 str_error_r(errno, sbuf, sizeof(sbuf))); 1004 return -errno; 1005 } 1006 /* Skip to starting line number */ 1007 while (l < lr->start) { 1008 ret = skip_one_line(fp, l++); 1009 if (ret < 0) 1010 goto end; 1011 } 1012 1013 intlist__for_each_entry(ln, lr->line_list) { 1014 for (; ln->i > l; l++) { 1015 ret = show_one_line(fp, l - lr->offset); 1016 if (ret < 0) 1017 goto end; 1018 } 1019 ret = show_one_line_with_num(fp, l++ - lr->offset); 1020 if (ret < 0) 1021 goto end; 1022 } 1023 1024 if (lr->end == INT_MAX) 1025 lr->end = l + NR_ADDITIONAL_LINES; 1026 while (l <= lr->end) { 1027 ret = show_one_line_or_eof(fp, l++ - lr->offset); 1028 if (ret <= 0) 1029 break; 1030 } 1031 end: 1032 fclose(fp); 1033 return ret; 1034 } 1035 1036 int show_line_range(struct line_range *lr, const char *module, 1037 struct nsinfo *nsi, bool user) 1038 { 1039 int ret; 1040 struct nscookie nsc; 1041 1042 ret = init_probe_symbol_maps(user); 1043 if (ret < 0) 1044 return ret; 1045 nsinfo__mountns_enter(nsi, &nsc); 1046 ret = __show_line_range(lr, module, user); 1047 nsinfo__mountns_exit(&nsc); 1048 exit_probe_symbol_maps(); 1049 1050 return ret; 1051 } 1052 1053 static int show_available_vars_at(struct debuginfo *dinfo, 1054 struct perf_probe_event *pev, 1055 struct strfilter *_filter) 1056 { 1057 char *buf; 1058 int ret, i, nvars; 1059 struct str_node *node; 1060 struct variable_list *vls = NULL, *vl; 1061 struct perf_probe_point tmp; 1062 const char *var; 1063 1064 buf = synthesize_perf_probe_point(&pev->point); 1065 if (!buf) 1066 return -EINVAL; 1067 pr_debug("Searching variables at %s\n", buf); 1068 1069 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); 1070 if (!ret) { /* Not found, retry with an alternative */ 1071 ret = get_alternative_probe_event(dinfo, pev, &tmp); 1072 if (!ret) { 1073 ret = debuginfo__find_available_vars_at(dinfo, pev, 1074 &vls); 1075 /* Release the old probe_point */ 1076 clear_perf_probe_point(&tmp); 1077 } 1078 } 1079 if (ret <= 0) { 1080 if (ret == 0 || ret == -ENOENT) { 1081 pr_err("Failed to find the address of %s\n", buf); 1082 ret = -ENOENT; 1083 } else 1084 pr_warning("Debuginfo analysis failed.\n"); 1085 goto end; 1086 } 1087 1088 /* Some variables are found */ 1089 fprintf(stdout, "Available variables at %s\n", buf); 1090 for (i = 0; i < ret; i++) { 1091 vl = &vls[i]; 1092 /* 1093 * A probe point might be converted to 1094 * several trace points. 1095 */ 1096 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, 1097 vl->point.offset); 1098 zfree(&vl->point.symbol); 1099 nvars = 0; 1100 if (vl->vars) { 1101 strlist__for_each_entry(node, vl->vars) { 1102 var = strchr(node->s, '\t') + 1; 1103 if (strfilter__compare(_filter, var)) { 1104 fprintf(stdout, "\t\t%s\n", node->s); 1105 nvars++; 1106 } 1107 } 1108 strlist__delete(vl->vars); 1109 } 1110 if (nvars == 0) 1111 fprintf(stdout, "\t\t(No matched variables)\n"); 1112 } 1113 free(vls); 1114 end: 1115 free(buf); 1116 return ret; 1117 } 1118 1119 /* Show available variables on given probe point */ 1120 int show_available_vars(struct perf_probe_event *pevs, int npevs, 1121 struct strfilter *_filter) 1122 { 1123 int i, ret = 0; 1124 struct debuginfo *dinfo; 1125 1126 ret = init_probe_symbol_maps(pevs->uprobes); 1127 if (ret < 0) 1128 return ret; 1129 1130 dinfo = open_debuginfo(pevs->target, pevs->nsi, false); 1131 if (!dinfo) { 1132 ret = -ENOENT; 1133 goto out; 1134 } 1135 1136 setup_pager(); 1137 1138 for (i = 0; i < npevs && ret >= 0; i++) 1139 ret = show_available_vars_at(dinfo, &pevs[i], _filter); 1140 1141 debuginfo__delete(dinfo); 1142 out: 1143 exit_probe_symbol_maps(); 1144 return ret; 1145 } 1146 1147 #else /* !HAVE_DWARF_SUPPORT */ 1148 1149 static void debuginfo_cache__exit(void) 1150 { 1151 } 1152 1153 static int 1154 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, 1155 struct perf_probe_point *pp __maybe_unused, 1156 bool is_kprobe __maybe_unused) 1157 { 1158 return -ENOSYS; 1159 } 1160 1161 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 1162 struct probe_trace_event **tevs __maybe_unused) 1163 { 1164 if (perf_probe_event_need_dwarf(pev)) { 1165 pr_warning("Debuginfo-analysis is not supported.\n"); 1166 return -ENOSYS; 1167 } 1168 1169 return 0; 1170 } 1171 1172 int show_line_range(struct line_range *lr __maybe_unused, 1173 const char *module __maybe_unused, 1174 struct nsinfo *nsi __maybe_unused, 1175 bool user __maybe_unused) 1176 { 1177 pr_warning("Debuginfo-analysis is not supported.\n"); 1178 return -ENOSYS; 1179 } 1180 1181 int show_available_vars(struct perf_probe_event *pevs __maybe_unused, 1182 int npevs __maybe_unused, 1183 struct strfilter *filter __maybe_unused) 1184 { 1185 pr_warning("Debuginfo-analysis is not supported.\n"); 1186 return -ENOSYS; 1187 } 1188 #endif 1189 1190 void line_range__clear(struct line_range *lr) 1191 { 1192 free(lr->function); 1193 free(lr->file); 1194 free(lr->path); 1195 free(lr->comp_dir); 1196 intlist__delete(lr->line_list); 1197 memset(lr, 0, sizeof(*lr)); 1198 } 1199 1200 int line_range__init(struct line_range *lr) 1201 { 1202 memset(lr, 0, sizeof(*lr)); 1203 lr->line_list = intlist__new(NULL); 1204 if (!lr->line_list) 1205 return -ENOMEM; 1206 else 1207 return 0; 1208 } 1209 1210 static int parse_line_num(char **ptr, int *val, const char *what) 1211 { 1212 const char *start = *ptr; 1213 1214 errno = 0; 1215 *val = strtol(*ptr, ptr, 0); 1216 if (errno || *ptr == start) { 1217 semantic_error("'%s' is not a valid number.\n", what); 1218 return -EINVAL; 1219 } 1220 return 0; 1221 } 1222 1223 /* Check the name is good for event, group or function */ 1224 static bool is_c_func_name(const char *name) 1225 { 1226 if (!isalpha(*name) && *name != '_') 1227 return false; 1228 while (*++name != '\0') { 1229 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1230 return false; 1231 } 1232 return true; 1233 } 1234 1235 /* 1236 * Stuff 'lr' according to the line range described by 'arg'. 1237 * The line range syntax is described by: 1238 * 1239 * SRC[:SLN[+NUM|-ELN]] 1240 * FNC[@SRC][:SLN[+NUM|-ELN]] 1241 */ 1242 int parse_line_range_desc(const char *arg, struct line_range *lr) 1243 { 1244 char *range, *file, *name = strdup(arg); 1245 int err; 1246 1247 if (!name) 1248 return -ENOMEM; 1249 1250 lr->start = 0; 1251 lr->end = INT_MAX; 1252 1253 range = strchr(name, ':'); 1254 if (range) { 1255 *range++ = '\0'; 1256 1257 err = parse_line_num(&range, &lr->start, "start line"); 1258 if (err) 1259 goto err; 1260 1261 if (*range == '+' || *range == '-') { 1262 const char c = *range++; 1263 1264 err = parse_line_num(&range, &lr->end, "end line"); 1265 if (err) 1266 goto err; 1267 1268 if (c == '+') { 1269 lr->end += lr->start; 1270 /* 1271 * Adjust the number of lines here. 1272 * If the number of lines == 1, the 1273 * the end of line should be equal to 1274 * the start of line. 1275 */ 1276 lr->end--; 1277 } 1278 } 1279 1280 pr_debug("Line range is %d to %d\n", lr->start, lr->end); 1281 1282 err = -EINVAL; 1283 if (lr->start > lr->end) { 1284 semantic_error("Start line must be smaller" 1285 " than end line.\n"); 1286 goto err; 1287 } 1288 if (*range != '\0') { 1289 semantic_error("Tailing with invalid str '%s'.\n", range); 1290 goto err; 1291 } 1292 } 1293 1294 file = strchr(name, '@'); 1295 if (file) { 1296 *file = '\0'; 1297 lr->file = strdup(++file); 1298 if (lr->file == NULL) { 1299 err = -ENOMEM; 1300 goto err; 1301 } 1302 lr->function = name; 1303 } else if (strchr(name, '/') || strchr(name, '.')) 1304 lr->file = name; 1305 else if (is_c_func_name(name))/* We reuse it for checking funcname */ 1306 lr->function = name; 1307 else { /* Invalid name */ 1308 semantic_error("'%s' is not a valid function name.\n", name); 1309 err = -EINVAL; 1310 goto err; 1311 } 1312 1313 return 0; 1314 err: 1315 free(name); 1316 return err; 1317 } 1318 1319 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) 1320 { 1321 char *ptr; 1322 1323 ptr = strpbrk_esc(*arg, ":"); 1324 if (ptr) { 1325 *ptr = '\0'; 1326 if (!pev->sdt && !is_c_func_name(*arg)) 1327 goto ng_name; 1328 pev->group = strdup_esc(*arg); 1329 if (!pev->group) 1330 return -ENOMEM; 1331 *arg = ptr + 1; 1332 } else 1333 pev->group = NULL; 1334 1335 pev->event = strdup_esc(*arg); 1336 if (pev->event == NULL) 1337 return -ENOMEM; 1338 1339 if (!pev->sdt && !is_c_func_name(pev->event)) { 1340 zfree(&pev->event); 1341 ng_name: 1342 zfree(&pev->group); 1343 semantic_error("%s is bad for event name -it must " 1344 "follow C symbol-naming rule.\n", *arg); 1345 return -EINVAL; 1346 } 1347 return 0; 1348 } 1349 1350 /* Parse probepoint definition. */ 1351 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) 1352 { 1353 struct perf_probe_point *pp = &pev->point; 1354 char *ptr, *tmp; 1355 char c, nc = 0; 1356 bool file_spec = false; 1357 int ret; 1358 1359 /* 1360 * <Syntax> 1361 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] 1362 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] 1363 * perf probe %[GRP:]SDT_EVENT 1364 */ 1365 if (!arg) 1366 return -EINVAL; 1367 1368 if (is_sdt_event(arg)) { 1369 pev->sdt = true; 1370 if (arg[0] == '%') 1371 arg++; 1372 } 1373 1374 ptr = strpbrk_esc(arg, ";=@+%"); 1375 if (pev->sdt) { 1376 if (ptr) { 1377 if (*ptr != '@') { 1378 semantic_error("%s must be an SDT name.\n", 1379 arg); 1380 return -EINVAL; 1381 } 1382 /* This must be a target file name or build id */ 1383 tmp = build_id_cache__complement(ptr + 1); 1384 if (tmp) { 1385 pev->target = build_id_cache__origname(tmp); 1386 free(tmp); 1387 } else 1388 pev->target = strdup_esc(ptr + 1); 1389 if (!pev->target) 1390 return -ENOMEM; 1391 *ptr = '\0'; 1392 } 1393 ret = parse_perf_probe_event_name(&arg, pev); 1394 if (ret == 0) { 1395 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) 1396 ret = -errno; 1397 } 1398 return ret; 1399 } 1400 1401 if (ptr && *ptr == '=') { /* Event name */ 1402 *ptr = '\0'; 1403 tmp = ptr + 1; 1404 ret = parse_perf_probe_event_name(&arg, pev); 1405 if (ret < 0) 1406 return ret; 1407 1408 arg = tmp; 1409 } 1410 1411 /* 1412 * Check arg is function or file name and copy it. 1413 * 1414 * We consider arg to be a file spec if and only if it satisfies 1415 * all of the below criteria:: 1416 * - it does not include any of "+@%", 1417 * - it includes one of ":;", and 1418 * - it has a period '.' in the name. 1419 * 1420 * Otherwise, we consider arg to be a function specification. 1421 */ 1422 if (!strpbrk_esc(arg, "+@%")) { 1423 ptr = strpbrk_esc(arg, ";:"); 1424 /* This is a file spec if it includes a '.' before ; or : */ 1425 if (ptr && memchr(arg, '.', ptr - arg)) 1426 file_spec = true; 1427 } 1428 1429 ptr = strpbrk_esc(arg, ";:+@%"); 1430 if (ptr) { 1431 nc = *ptr; 1432 *ptr++ = '\0'; 1433 } 1434 1435 if (arg[0] == '\0') 1436 tmp = NULL; 1437 else { 1438 tmp = strdup_esc(arg); 1439 if (tmp == NULL) 1440 return -ENOMEM; 1441 } 1442 1443 if (file_spec) 1444 pp->file = tmp; 1445 else { 1446 pp->function = tmp; 1447 1448 /* 1449 * Keep pp->function even if this is absolute address, 1450 * so it can mark whether abs_address is valid. 1451 * Which make 'perf probe lib.bin 0x0' possible. 1452 * 1453 * Note that checking length of tmp is not needed 1454 * because when we access tmp[1] we know tmp[0] is '0', 1455 * so tmp[1] should always valid (but could be '\0'). 1456 */ 1457 if (tmp && !strncmp(tmp, "0x", 2)) { 1458 pp->abs_address = strtoul(pp->function, &tmp, 0); 1459 if (*tmp != '\0') { 1460 semantic_error("Invalid absolute address.\n"); 1461 return -EINVAL; 1462 } 1463 } 1464 } 1465 1466 /* Parse other options */ 1467 while (ptr) { 1468 arg = ptr; 1469 c = nc; 1470 if (c == ';') { /* Lazy pattern must be the last part */ 1471 pp->lazy_line = strdup(arg); /* let leave escapes */ 1472 if (pp->lazy_line == NULL) 1473 return -ENOMEM; 1474 break; 1475 } 1476 ptr = strpbrk_esc(arg, ";:+@%"); 1477 if (ptr) { 1478 nc = *ptr; 1479 *ptr++ = '\0'; 1480 } 1481 switch (c) { 1482 case ':': /* Line number */ 1483 pp->line = strtoul(arg, &tmp, 0); 1484 if (*tmp != '\0') { 1485 semantic_error("There is non-digit char" 1486 " in line number.\n"); 1487 return -EINVAL; 1488 } 1489 break; 1490 case '+': /* Byte offset from a symbol */ 1491 pp->offset = strtoul(arg, &tmp, 0); 1492 if (*tmp != '\0') { 1493 semantic_error("There is non-digit character" 1494 " in offset.\n"); 1495 return -EINVAL; 1496 } 1497 break; 1498 case '@': /* File name */ 1499 if (pp->file) { 1500 semantic_error("SRC@SRC is not allowed.\n"); 1501 return -EINVAL; 1502 } 1503 pp->file = strdup_esc(arg); 1504 if (pp->file == NULL) 1505 return -ENOMEM; 1506 break; 1507 case '%': /* Probe places */ 1508 if (strcmp(arg, "return") == 0) { 1509 pp->retprobe = 1; 1510 } else { /* Others not supported yet */ 1511 semantic_error("%%%s is not supported.\n", arg); 1512 return -ENOTSUP; 1513 } 1514 break; 1515 default: /* Buggy case */ 1516 pr_err("This program has a bug at %s:%d.\n", 1517 __FILE__, __LINE__); 1518 return -ENOTSUP; 1519 break; 1520 } 1521 } 1522 1523 /* Exclusion check */ 1524 if (pp->lazy_line && pp->line) { 1525 semantic_error("Lazy pattern can't be used with" 1526 " line number.\n"); 1527 return -EINVAL; 1528 } 1529 1530 if (pp->lazy_line && pp->offset) { 1531 semantic_error("Lazy pattern can't be used with offset.\n"); 1532 return -EINVAL; 1533 } 1534 1535 if (pp->line && pp->offset) { 1536 semantic_error("Offset can't be used with line number.\n"); 1537 return -EINVAL; 1538 } 1539 1540 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { 1541 semantic_error("File always requires line number or " 1542 "lazy pattern.\n"); 1543 return -EINVAL; 1544 } 1545 1546 if (pp->offset && !pp->function) { 1547 semantic_error("Offset requires an entry function.\n"); 1548 return -EINVAL; 1549 } 1550 1551 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { 1552 semantic_error("Offset/Line/Lazy pattern can't be used with " 1553 "return probe.\n"); 1554 return -EINVAL; 1555 } 1556 1557 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", 1558 pp->function, pp->file, pp->line, pp->offset, pp->retprobe, 1559 pp->lazy_line); 1560 return 0; 1561 } 1562 1563 /* Parse perf-probe event argument */ 1564 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) 1565 { 1566 char *tmp, *goodname; 1567 struct perf_probe_arg_field **fieldp; 1568 1569 pr_debug("parsing arg: %s into ", str); 1570 1571 tmp = strchr(str, '='); 1572 if (tmp) { 1573 arg->name = strndup(str, tmp - str); 1574 if (arg->name == NULL) 1575 return -ENOMEM; 1576 pr_debug("name:%s ", arg->name); 1577 str = tmp + 1; 1578 } 1579 1580 tmp = strchr(str, ':'); 1581 if (tmp) { /* Type setting */ 1582 *tmp = '\0'; 1583 arg->type = strdup(tmp + 1); 1584 if (arg->type == NULL) 1585 return -ENOMEM; 1586 pr_debug("type:%s ", arg->type); 1587 } 1588 1589 tmp = strpbrk(str, "-.["); 1590 if (!is_c_varname(str) || !tmp) { 1591 /* A variable, register, symbol or special value */ 1592 arg->var = strdup(str); 1593 if (arg->var == NULL) 1594 return -ENOMEM; 1595 pr_debug("%s\n", arg->var); 1596 return 0; 1597 } 1598 1599 /* Structure fields or array element */ 1600 arg->var = strndup(str, tmp - str); 1601 if (arg->var == NULL) 1602 return -ENOMEM; 1603 goodname = arg->var; 1604 pr_debug("%s, ", arg->var); 1605 fieldp = &arg->field; 1606 1607 do { 1608 *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); 1609 if (*fieldp == NULL) 1610 return -ENOMEM; 1611 if (*tmp == '[') { /* Array */ 1612 str = tmp; 1613 (*fieldp)->index = strtol(str + 1, &tmp, 0); 1614 (*fieldp)->ref = true; 1615 if (*tmp != ']' || tmp == str + 1) { 1616 semantic_error("Array index must be a" 1617 " number.\n"); 1618 return -EINVAL; 1619 } 1620 tmp++; 1621 if (*tmp == '\0') 1622 tmp = NULL; 1623 } else { /* Structure */ 1624 if (*tmp == '.') { 1625 str = tmp + 1; 1626 (*fieldp)->ref = false; 1627 } else if (tmp[1] == '>') { 1628 str = tmp + 2; 1629 (*fieldp)->ref = true; 1630 } else { 1631 semantic_error("Argument parse error: %s\n", 1632 str); 1633 return -EINVAL; 1634 } 1635 tmp = strpbrk(str, "-.["); 1636 } 1637 if (tmp) { 1638 (*fieldp)->name = strndup(str, tmp - str); 1639 if ((*fieldp)->name == NULL) 1640 return -ENOMEM; 1641 if (*str != '[') 1642 goodname = (*fieldp)->name; 1643 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); 1644 fieldp = &(*fieldp)->next; 1645 } 1646 } while (tmp); 1647 (*fieldp)->name = strdup(str); 1648 if ((*fieldp)->name == NULL) 1649 return -ENOMEM; 1650 if (*str != '[') 1651 goodname = (*fieldp)->name; 1652 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); 1653 1654 /* If no name is specified, set the last field name (not array index)*/ 1655 if (!arg->name) { 1656 arg->name = strdup(goodname); 1657 if (arg->name == NULL) 1658 return -ENOMEM; 1659 } 1660 return 0; 1661 } 1662 1663 /* Parse perf-probe event command */ 1664 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) 1665 { 1666 char **argv; 1667 int argc, i, ret = 0; 1668 1669 argv = argv_split(cmd, &argc); 1670 if (!argv) { 1671 pr_debug("Failed to split arguments.\n"); 1672 return -ENOMEM; 1673 } 1674 if (argc - 1 > MAX_PROBE_ARGS) { 1675 semantic_error("Too many probe arguments (%d).\n", argc - 1); 1676 ret = -ERANGE; 1677 goto out; 1678 } 1679 /* Parse probe point */ 1680 ret = parse_perf_probe_point(argv[0], pev); 1681 if (ret < 0) 1682 goto out; 1683 1684 /* Copy arguments and ensure return probe has no C argument */ 1685 pev->nargs = argc - 1; 1686 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 1687 if (pev->args == NULL) { 1688 ret = -ENOMEM; 1689 goto out; 1690 } 1691 for (i = 0; i < pev->nargs && ret >= 0; i++) { 1692 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); 1693 if (ret >= 0 && 1694 is_c_varname(pev->args[i].var) && pev->point.retprobe) { 1695 semantic_error("You can't specify local variable for" 1696 " kretprobe.\n"); 1697 ret = -EINVAL; 1698 } 1699 } 1700 out: 1701 argv_free(argv); 1702 1703 return ret; 1704 } 1705 1706 /* Returns true if *any* ARG is either C variable, $params or $vars. */ 1707 bool perf_probe_with_var(struct perf_probe_event *pev) 1708 { 1709 int i = 0; 1710 1711 for (i = 0; i < pev->nargs; i++) 1712 if (is_c_varname(pev->args[i].var) || 1713 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || 1714 !strcmp(pev->args[i].var, PROBE_ARG_VARS)) 1715 return true; 1716 return false; 1717 } 1718 1719 /* Return true if this perf_probe_event requires debuginfo */ 1720 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) 1721 { 1722 if (pev->point.file || pev->point.line || pev->point.lazy_line) 1723 return true; 1724 1725 if (perf_probe_with_var(pev)) 1726 return true; 1727 1728 return false; 1729 } 1730 1731 /* Parse probe_events event into struct probe_point */ 1732 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) 1733 { 1734 struct probe_trace_point *tp = &tev->point; 1735 char pr; 1736 char *p; 1737 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; 1738 int ret, i, argc; 1739 char **argv; 1740 1741 pr_debug("Parsing probe_events: %s\n", cmd); 1742 argv = argv_split(cmd, &argc); 1743 if (!argv) { 1744 pr_debug("Failed to split arguments.\n"); 1745 return -ENOMEM; 1746 } 1747 if (argc < 2) { 1748 semantic_error("Too few probe arguments.\n"); 1749 ret = -ERANGE; 1750 goto out; 1751 } 1752 1753 /* Scan event and group name. */ 1754 argv0_str = strdup(argv[0]); 1755 if (argv0_str == NULL) { 1756 ret = -ENOMEM; 1757 goto out; 1758 } 1759 fmt1_str = strtok_r(argv0_str, ":", &fmt); 1760 fmt2_str = strtok_r(NULL, "/", &fmt); 1761 fmt3_str = strtok_r(NULL, " \t", &fmt); 1762 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL 1763 || fmt3_str == NULL) { 1764 semantic_error("Failed to parse event name: %s\n", argv[0]); 1765 ret = -EINVAL; 1766 goto out; 1767 } 1768 pr = fmt1_str[0]; 1769 tev->group = strdup(fmt2_str); 1770 tev->event = strdup(fmt3_str); 1771 if (tev->group == NULL || tev->event == NULL) { 1772 ret = -ENOMEM; 1773 goto out; 1774 } 1775 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); 1776 1777 tp->retprobe = (pr == 'r'); 1778 1779 /* Scan module name(if there), function name and offset */ 1780 p = strchr(argv[1], ':'); 1781 if (p) { 1782 tp->module = strndup(argv[1], p - argv[1]); 1783 if (!tp->module) { 1784 ret = -ENOMEM; 1785 goto out; 1786 } 1787 tev->uprobes = (tp->module[0] == '/'); 1788 p++; 1789 } else 1790 p = argv[1]; 1791 fmt1_str = strtok_r(p, "+", &fmt); 1792 /* only the address started with 0x */ 1793 if (fmt1_str[0] == '0') { 1794 /* 1795 * Fix a special case: 1796 * if address == 0, kernel reports something like: 1797 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax 1798 * Newer kernel may fix that, but we want to 1799 * support old kernel also. 1800 */ 1801 if (strcmp(fmt1_str, "0x") == 0) { 1802 if (!argv[2] || strcmp(argv[2], "(null)")) { 1803 ret = -EINVAL; 1804 goto out; 1805 } 1806 tp->address = 0; 1807 1808 free(argv[2]); 1809 for (i = 2; argv[i + 1] != NULL; i++) 1810 argv[i] = argv[i + 1]; 1811 1812 argv[i] = NULL; 1813 argc -= 1; 1814 } else 1815 tp->address = strtoul(fmt1_str, NULL, 0); 1816 } else { 1817 /* Only the symbol-based probe has offset */ 1818 tp->symbol = strdup(fmt1_str); 1819 if (tp->symbol == NULL) { 1820 ret = -ENOMEM; 1821 goto out; 1822 } 1823 fmt2_str = strtok_r(NULL, "", &fmt); 1824 if (fmt2_str == NULL) 1825 tp->offset = 0; 1826 else 1827 tp->offset = strtoul(fmt2_str, NULL, 10); 1828 } 1829 1830 if (tev->uprobes) { 1831 fmt2_str = strchr(p, '('); 1832 if (fmt2_str) 1833 tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0); 1834 } 1835 1836 tev->nargs = argc - 2; 1837 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 1838 if (tev->args == NULL) { 1839 ret = -ENOMEM; 1840 goto out; 1841 } 1842 for (i = 0; i < tev->nargs; i++) { 1843 p = strchr(argv[i + 2], '='); 1844 if (p) /* We don't need which register is assigned. */ 1845 *p++ = '\0'; 1846 else 1847 p = argv[i + 2]; 1848 tev->args[i].name = strdup(argv[i + 2]); 1849 /* TODO: parse regs and offset */ 1850 tev->args[i].value = strdup(p); 1851 if (tev->args[i].name == NULL || tev->args[i].value == NULL) { 1852 ret = -ENOMEM; 1853 goto out; 1854 } 1855 } 1856 ret = 0; 1857 out: 1858 free(argv0_str); 1859 argv_free(argv); 1860 return ret; 1861 } 1862 1863 /* Compose only probe arg */ 1864 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) 1865 { 1866 struct perf_probe_arg_field *field = pa->field; 1867 struct strbuf buf; 1868 char *ret = NULL; 1869 int err; 1870 1871 if (strbuf_init(&buf, 64) < 0) 1872 return NULL; 1873 1874 if (pa->name && pa->var) 1875 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); 1876 else 1877 err = strbuf_addstr(&buf, pa->name ?: pa->var); 1878 if (err) 1879 goto out; 1880 1881 while (field) { 1882 if (field->name[0] == '[') 1883 err = strbuf_addstr(&buf, field->name); 1884 else 1885 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", 1886 field->name); 1887 field = field->next; 1888 if (err) 1889 goto out; 1890 } 1891 1892 if (pa->type) 1893 if (strbuf_addf(&buf, ":%s", pa->type) < 0) 1894 goto out; 1895 1896 ret = strbuf_detach(&buf, NULL); 1897 out: 1898 strbuf_release(&buf); 1899 return ret; 1900 } 1901 1902 /* Compose only probe point (not argument) */ 1903 char *synthesize_perf_probe_point(struct perf_probe_point *pp) 1904 { 1905 struct strbuf buf; 1906 char *tmp, *ret = NULL; 1907 int len, err = 0; 1908 1909 if (strbuf_init(&buf, 64) < 0) 1910 return NULL; 1911 1912 if (pp->function) { 1913 if (strbuf_addstr(&buf, pp->function) < 0) 1914 goto out; 1915 if (pp->offset) 1916 err = strbuf_addf(&buf, "+%lu", pp->offset); 1917 else if (pp->line) 1918 err = strbuf_addf(&buf, ":%d", pp->line); 1919 else if (pp->retprobe) 1920 err = strbuf_addstr(&buf, "%return"); 1921 if (err) 1922 goto out; 1923 } 1924 if (pp->file) { 1925 tmp = pp->file; 1926 len = strlen(tmp); 1927 if (len > 30) { 1928 tmp = strchr(pp->file + len - 30, '/'); 1929 tmp = tmp ? tmp + 1 : pp->file + len - 30; 1930 } 1931 err = strbuf_addf(&buf, "@%s", tmp); 1932 if (!err && !pp->function && pp->line) 1933 err = strbuf_addf(&buf, ":%d", pp->line); 1934 } 1935 if (!err) 1936 ret = strbuf_detach(&buf, NULL); 1937 out: 1938 strbuf_release(&buf); 1939 return ret; 1940 } 1941 1942 char *synthesize_perf_probe_command(struct perf_probe_event *pev) 1943 { 1944 struct strbuf buf; 1945 char *tmp, *ret = NULL; 1946 int i; 1947 1948 if (strbuf_init(&buf, 64)) 1949 return NULL; 1950 if (pev->event) 1951 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, 1952 pev->event) < 0) 1953 goto out; 1954 1955 tmp = synthesize_perf_probe_point(&pev->point); 1956 if (!tmp || strbuf_addstr(&buf, tmp) < 0) 1957 goto out; 1958 free(tmp); 1959 1960 for (i = 0; i < pev->nargs; i++) { 1961 tmp = synthesize_perf_probe_arg(pev->args + i); 1962 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) 1963 goto out; 1964 free(tmp); 1965 } 1966 1967 ret = strbuf_detach(&buf, NULL); 1968 out: 1969 strbuf_release(&buf); 1970 return ret; 1971 } 1972 1973 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, 1974 struct strbuf *buf, int depth) 1975 { 1976 int err; 1977 if (ref->next) { 1978 depth = __synthesize_probe_trace_arg_ref(ref->next, buf, 1979 depth + 1); 1980 if (depth < 0) 1981 return depth; 1982 } 1983 err = strbuf_addf(buf, "%+ld(", ref->offset); 1984 return (err < 0) ? err : depth; 1985 } 1986 1987 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, 1988 struct strbuf *buf) 1989 { 1990 struct probe_trace_arg_ref *ref = arg->ref; 1991 int depth = 0, err; 1992 1993 /* Argument name or separator */ 1994 if (arg->name) 1995 err = strbuf_addf(buf, " %s=", arg->name); 1996 else 1997 err = strbuf_addch(buf, ' '); 1998 if (err) 1999 return err; 2000 2001 /* Special case: @XXX */ 2002 if (arg->value[0] == '@' && arg->ref) 2003 ref = ref->next; 2004 2005 /* Dereferencing arguments */ 2006 if (ref) { 2007 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); 2008 if (depth < 0) 2009 return depth; 2010 } 2011 2012 /* Print argument value */ 2013 if (arg->value[0] == '@' && arg->ref) 2014 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); 2015 else 2016 err = strbuf_addstr(buf, arg->value); 2017 2018 /* Closing */ 2019 while (!err && depth--) 2020 err = strbuf_addch(buf, ')'); 2021 2022 /* Print argument type */ 2023 if (!err && arg->type) 2024 err = strbuf_addf(buf, ":%s", arg->type); 2025 2026 return err; 2027 } 2028 2029 static int 2030 synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf) 2031 { 2032 struct probe_trace_point *tp = &tev->point; 2033 int err; 2034 2035 err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address); 2036 2037 if (err >= 0 && tp->ref_ctr_offset) { 2038 if (!uprobe_ref_ctr_is_supported()) 2039 return -1; 2040 err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset); 2041 } 2042 return err >= 0 ? 0 : -1; 2043 } 2044 2045 char *synthesize_probe_trace_command(struct probe_trace_event *tev) 2046 { 2047 struct probe_trace_point *tp = &tev->point; 2048 struct strbuf buf; 2049 char *ret = NULL; 2050 int i, err; 2051 2052 /* Uprobes must have tp->module */ 2053 if (tev->uprobes && !tp->module) 2054 return NULL; 2055 2056 if (strbuf_init(&buf, 32) < 0) 2057 return NULL; 2058 2059 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', 2060 tev->group, tev->event) < 0) 2061 goto error; 2062 /* 2063 * If tp->address == 0, then this point must be a 2064 * absolute address uprobe. 2065 * try_to_find_absolute_address() should have made 2066 * tp->symbol to "0x0". 2067 */ 2068 if (tev->uprobes && !tp->address) { 2069 if (!tp->symbol || strcmp(tp->symbol, "0x0")) 2070 goto error; 2071 } 2072 2073 /* Use the tp->address for uprobes */ 2074 if (tev->uprobes) { 2075 err = synthesize_uprobe_trace_def(tev, &buf); 2076 } else if (!strncmp(tp->symbol, "0x", 2)) { 2077 /* Absolute address. See try_to_find_absolute_address() */ 2078 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", 2079 tp->module ? ":" : "", tp->address); 2080 } else { 2081 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", 2082 tp->module ? ":" : "", tp->symbol, tp->offset); 2083 } 2084 2085 if (err) 2086 goto error; 2087 2088 for (i = 0; i < tev->nargs; i++) 2089 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) 2090 goto error; 2091 2092 ret = strbuf_detach(&buf, NULL); 2093 error: 2094 strbuf_release(&buf); 2095 return ret; 2096 } 2097 2098 static int find_perf_probe_point_from_map(struct probe_trace_point *tp, 2099 struct perf_probe_point *pp, 2100 bool is_kprobe) 2101 { 2102 struct symbol *sym = NULL; 2103 struct map *map = NULL; 2104 u64 addr = tp->address; 2105 int ret = -ENOENT; 2106 2107 if (!is_kprobe) { 2108 map = dso__new_map(tp->module); 2109 if (!map) 2110 goto out; 2111 sym = map__find_symbol(map, addr); 2112 } else { 2113 if (tp->symbol && !addr) { 2114 if (kernel_get_symbol_address_by_name(tp->symbol, 2115 &addr, true, false) < 0) 2116 goto out; 2117 } 2118 if (addr) { 2119 addr += tp->offset; 2120 sym = machine__find_kernel_symbol(host_machine, addr, &map); 2121 } 2122 } 2123 2124 if (!sym) 2125 goto out; 2126 2127 pp->retprobe = tp->retprobe; 2128 pp->offset = addr - map->unmap_ip(map, sym->start); 2129 pp->function = strdup(sym->name); 2130 ret = pp->function ? 0 : -ENOMEM; 2131 2132 out: 2133 if (map && !is_kprobe) { 2134 map__put(map); 2135 } 2136 2137 return ret; 2138 } 2139 2140 static int convert_to_perf_probe_point(struct probe_trace_point *tp, 2141 struct perf_probe_point *pp, 2142 bool is_kprobe) 2143 { 2144 char buf[128]; 2145 int ret; 2146 2147 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); 2148 if (!ret) 2149 return 0; 2150 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); 2151 if (!ret) 2152 return 0; 2153 2154 pr_debug("Failed to find probe point from both of dwarf and map.\n"); 2155 2156 if (tp->symbol) { 2157 pp->function = strdup(tp->symbol); 2158 pp->offset = tp->offset; 2159 } else { 2160 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); 2161 if (ret < 0) 2162 return ret; 2163 pp->function = strdup(buf); 2164 pp->offset = 0; 2165 } 2166 if (pp->function == NULL) 2167 return -ENOMEM; 2168 2169 pp->retprobe = tp->retprobe; 2170 2171 return 0; 2172 } 2173 2174 static int convert_to_perf_probe_event(struct probe_trace_event *tev, 2175 struct perf_probe_event *pev, bool is_kprobe) 2176 { 2177 struct strbuf buf = STRBUF_INIT; 2178 int i, ret; 2179 2180 /* Convert event/group name */ 2181 pev->event = strdup(tev->event); 2182 pev->group = strdup(tev->group); 2183 if (pev->event == NULL || pev->group == NULL) 2184 return -ENOMEM; 2185 2186 /* Convert trace_point to probe_point */ 2187 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); 2188 if (ret < 0) 2189 return ret; 2190 2191 /* Convert trace_arg to probe_arg */ 2192 pev->nargs = tev->nargs; 2193 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 2194 if (pev->args == NULL) 2195 return -ENOMEM; 2196 for (i = 0; i < tev->nargs && ret >= 0; i++) { 2197 if (tev->args[i].name) 2198 pev->args[i].name = strdup(tev->args[i].name); 2199 else { 2200 if ((ret = strbuf_init(&buf, 32)) < 0) 2201 goto error; 2202 ret = synthesize_probe_trace_arg(&tev->args[i], &buf); 2203 pev->args[i].name = strbuf_detach(&buf, NULL); 2204 } 2205 if (pev->args[i].name == NULL && ret >= 0) 2206 ret = -ENOMEM; 2207 } 2208 error: 2209 if (ret < 0) 2210 clear_perf_probe_event(pev); 2211 2212 return ret; 2213 } 2214 2215 void clear_perf_probe_event(struct perf_probe_event *pev) 2216 { 2217 struct perf_probe_arg_field *field, *next; 2218 int i; 2219 2220 free(pev->event); 2221 free(pev->group); 2222 free(pev->target); 2223 clear_perf_probe_point(&pev->point); 2224 2225 for (i = 0; i < pev->nargs; i++) { 2226 free(pev->args[i].name); 2227 free(pev->args[i].var); 2228 free(pev->args[i].type); 2229 field = pev->args[i].field; 2230 while (field) { 2231 next = field->next; 2232 zfree(&field->name); 2233 free(field); 2234 field = next; 2235 } 2236 } 2237 free(pev->args); 2238 memset(pev, 0, sizeof(*pev)); 2239 } 2240 2241 #define strdup_or_goto(str, label) \ 2242 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) 2243 2244 static int perf_probe_point__copy(struct perf_probe_point *dst, 2245 struct perf_probe_point *src) 2246 { 2247 dst->file = strdup_or_goto(src->file, out_err); 2248 dst->function = strdup_or_goto(src->function, out_err); 2249 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); 2250 dst->line = src->line; 2251 dst->retprobe = src->retprobe; 2252 dst->offset = src->offset; 2253 return 0; 2254 2255 out_err: 2256 clear_perf_probe_point(dst); 2257 return -ENOMEM; 2258 } 2259 2260 static int perf_probe_arg__copy(struct perf_probe_arg *dst, 2261 struct perf_probe_arg *src) 2262 { 2263 struct perf_probe_arg_field *field, **ppfield; 2264 2265 dst->name = strdup_or_goto(src->name, out_err); 2266 dst->var = strdup_or_goto(src->var, out_err); 2267 dst->type = strdup_or_goto(src->type, out_err); 2268 2269 field = src->field; 2270 ppfield = &(dst->field); 2271 while (field) { 2272 *ppfield = zalloc(sizeof(*field)); 2273 if (!*ppfield) 2274 goto out_err; 2275 (*ppfield)->name = strdup_or_goto(field->name, out_err); 2276 (*ppfield)->index = field->index; 2277 (*ppfield)->ref = field->ref; 2278 field = field->next; 2279 ppfield = &((*ppfield)->next); 2280 } 2281 return 0; 2282 out_err: 2283 return -ENOMEM; 2284 } 2285 2286 int perf_probe_event__copy(struct perf_probe_event *dst, 2287 struct perf_probe_event *src) 2288 { 2289 int i; 2290 2291 dst->event = strdup_or_goto(src->event, out_err); 2292 dst->group = strdup_or_goto(src->group, out_err); 2293 dst->target = strdup_or_goto(src->target, out_err); 2294 dst->uprobes = src->uprobes; 2295 2296 if (perf_probe_point__copy(&dst->point, &src->point) < 0) 2297 goto out_err; 2298 2299 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); 2300 if (!dst->args) 2301 goto out_err; 2302 dst->nargs = src->nargs; 2303 2304 for (i = 0; i < src->nargs; i++) 2305 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) 2306 goto out_err; 2307 return 0; 2308 2309 out_err: 2310 clear_perf_probe_event(dst); 2311 return -ENOMEM; 2312 } 2313 2314 void clear_probe_trace_event(struct probe_trace_event *tev) 2315 { 2316 struct probe_trace_arg_ref *ref, *next; 2317 int i; 2318 2319 free(tev->event); 2320 free(tev->group); 2321 free(tev->point.symbol); 2322 free(tev->point.realname); 2323 free(tev->point.module); 2324 for (i = 0; i < tev->nargs; i++) { 2325 free(tev->args[i].name); 2326 free(tev->args[i].value); 2327 free(tev->args[i].type); 2328 ref = tev->args[i].ref; 2329 while (ref) { 2330 next = ref->next; 2331 free(ref); 2332 ref = next; 2333 } 2334 } 2335 free(tev->args); 2336 memset(tev, 0, sizeof(*tev)); 2337 } 2338 2339 struct kprobe_blacklist_node { 2340 struct list_head list; 2341 unsigned long start; 2342 unsigned long end; 2343 char *symbol; 2344 }; 2345 2346 static void kprobe_blacklist__delete(struct list_head *blacklist) 2347 { 2348 struct kprobe_blacklist_node *node; 2349 2350 while (!list_empty(blacklist)) { 2351 node = list_first_entry(blacklist, 2352 struct kprobe_blacklist_node, list); 2353 list_del(&node->list); 2354 free(node->symbol); 2355 free(node); 2356 } 2357 } 2358 2359 static int kprobe_blacklist__load(struct list_head *blacklist) 2360 { 2361 struct kprobe_blacklist_node *node; 2362 const char *__debugfs = debugfs__mountpoint(); 2363 char buf[PATH_MAX], *p; 2364 FILE *fp; 2365 int ret; 2366 2367 if (__debugfs == NULL) 2368 return -ENOTSUP; 2369 2370 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); 2371 if (ret < 0) 2372 return ret; 2373 2374 fp = fopen(buf, "r"); 2375 if (!fp) 2376 return -errno; 2377 2378 ret = 0; 2379 while (fgets(buf, PATH_MAX, fp)) { 2380 node = zalloc(sizeof(*node)); 2381 if (!node) { 2382 ret = -ENOMEM; 2383 break; 2384 } 2385 INIT_LIST_HEAD(&node->list); 2386 list_add_tail(&node->list, blacklist); 2387 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { 2388 ret = -EINVAL; 2389 break; 2390 } 2391 p = strchr(buf, '\t'); 2392 if (p) { 2393 p++; 2394 if (p[strlen(p) - 1] == '\n') 2395 p[strlen(p) - 1] = '\0'; 2396 } else 2397 p = (char *)"unknown"; 2398 node->symbol = strdup(p); 2399 if (!node->symbol) { 2400 ret = -ENOMEM; 2401 break; 2402 } 2403 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", 2404 node->start, node->end, node->symbol); 2405 ret++; 2406 } 2407 if (ret < 0) 2408 kprobe_blacklist__delete(blacklist); 2409 fclose(fp); 2410 2411 return ret; 2412 } 2413 2414 static struct kprobe_blacklist_node * 2415 kprobe_blacklist__find_by_address(struct list_head *blacklist, 2416 unsigned long address) 2417 { 2418 struct kprobe_blacklist_node *node; 2419 2420 list_for_each_entry(node, blacklist, list) { 2421 if (node->start <= address && address < node->end) 2422 return node; 2423 } 2424 2425 return NULL; 2426 } 2427 2428 static LIST_HEAD(kprobe_blacklist); 2429 2430 static void kprobe_blacklist__init(void) 2431 { 2432 if (!list_empty(&kprobe_blacklist)) 2433 return; 2434 2435 if (kprobe_blacklist__load(&kprobe_blacklist) < 0) 2436 pr_debug("No kprobe blacklist support, ignored\n"); 2437 } 2438 2439 static void kprobe_blacklist__release(void) 2440 { 2441 kprobe_blacklist__delete(&kprobe_blacklist); 2442 } 2443 2444 static bool kprobe_blacklist__listed(unsigned long address) 2445 { 2446 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); 2447 } 2448 2449 static int perf_probe_event__sprintf(const char *group, const char *event, 2450 struct perf_probe_event *pev, 2451 const char *module, 2452 struct strbuf *result) 2453 { 2454 int i, ret; 2455 char *buf; 2456 2457 if (asprintf(&buf, "%s:%s", group, event) < 0) 2458 return -errno; 2459 ret = strbuf_addf(result, " %-20s (on ", buf); 2460 free(buf); 2461 if (ret) 2462 return ret; 2463 2464 /* Synthesize only event probe point */ 2465 buf = synthesize_perf_probe_point(&pev->point); 2466 if (!buf) 2467 return -ENOMEM; 2468 ret = strbuf_addstr(result, buf); 2469 free(buf); 2470 2471 if (!ret && module) 2472 ret = strbuf_addf(result, " in %s", module); 2473 2474 if (!ret && pev->nargs > 0) { 2475 ret = strbuf_add(result, " with", 5); 2476 for (i = 0; !ret && i < pev->nargs; i++) { 2477 buf = synthesize_perf_probe_arg(&pev->args[i]); 2478 if (!buf) 2479 return -ENOMEM; 2480 ret = strbuf_addf(result, " %s", buf); 2481 free(buf); 2482 } 2483 } 2484 if (!ret) 2485 ret = strbuf_addch(result, ')'); 2486 2487 return ret; 2488 } 2489 2490 /* Show an event */ 2491 int show_perf_probe_event(const char *group, const char *event, 2492 struct perf_probe_event *pev, 2493 const char *module, bool use_stdout) 2494 { 2495 struct strbuf buf = STRBUF_INIT; 2496 int ret; 2497 2498 ret = perf_probe_event__sprintf(group, event, pev, module, &buf); 2499 if (ret >= 0) { 2500 if (use_stdout) 2501 printf("%s\n", buf.buf); 2502 else 2503 pr_info("%s\n", buf.buf); 2504 } 2505 strbuf_release(&buf); 2506 2507 return ret; 2508 } 2509 2510 static bool filter_probe_trace_event(struct probe_trace_event *tev, 2511 struct strfilter *filter) 2512 { 2513 char tmp[128]; 2514 2515 /* At first, check the event name itself */ 2516 if (strfilter__compare(filter, tev->event)) 2517 return true; 2518 2519 /* Next, check the combination of name and group */ 2520 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) 2521 return false; 2522 return strfilter__compare(filter, tmp); 2523 } 2524 2525 static int __show_perf_probe_events(int fd, bool is_kprobe, 2526 struct strfilter *filter) 2527 { 2528 int ret = 0; 2529 struct probe_trace_event tev; 2530 struct perf_probe_event pev; 2531 struct strlist *rawlist; 2532 struct str_node *ent; 2533 2534 memset(&tev, 0, sizeof(tev)); 2535 memset(&pev, 0, sizeof(pev)); 2536 2537 rawlist = probe_file__get_rawlist(fd); 2538 if (!rawlist) 2539 return -ENOMEM; 2540 2541 strlist__for_each_entry(ent, rawlist) { 2542 ret = parse_probe_trace_command(ent->s, &tev); 2543 if (ret >= 0) { 2544 if (!filter_probe_trace_event(&tev, filter)) 2545 goto next; 2546 ret = convert_to_perf_probe_event(&tev, &pev, 2547 is_kprobe); 2548 if (ret < 0) 2549 goto next; 2550 ret = show_perf_probe_event(pev.group, pev.event, 2551 &pev, tev.point.module, 2552 true); 2553 } 2554 next: 2555 clear_perf_probe_event(&pev); 2556 clear_probe_trace_event(&tev); 2557 if (ret < 0) 2558 break; 2559 } 2560 strlist__delete(rawlist); 2561 /* Cleanup cached debuginfo if needed */ 2562 debuginfo_cache__exit(); 2563 2564 return ret; 2565 } 2566 2567 /* List up current perf-probe events */ 2568 int show_perf_probe_events(struct strfilter *filter) 2569 { 2570 int kp_fd, up_fd, ret; 2571 2572 setup_pager(); 2573 2574 if (probe_conf.cache) 2575 return probe_cache__show_all_caches(filter); 2576 2577 ret = init_probe_symbol_maps(false); 2578 if (ret < 0) 2579 return ret; 2580 2581 ret = probe_file__open_both(&kp_fd, &up_fd, 0); 2582 if (ret < 0) 2583 return ret; 2584 2585 if (kp_fd >= 0) 2586 ret = __show_perf_probe_events(kp_fd, true, filter); 2587 if (up_fd >= 0 && ret >= 0) 2588 ret = __show_perf_probe_events(up_fd, false, filter); 2589 if (kp_fd > 0) 2590 close(kp_fd); 2591 if (up_fd > 0) 2592 close(up_fd); 2593 exit_probe_symbol_maps(); 2594 2595 return ret; 2596 } 2597 2598 static int get_new_event_name(char *buf, size_t len, const char *base, 2599 struct strlist *namelist, bool ret_event, 2600 bool allow_suffix) 2601 { 2602 int i, ret; 2603 char *p, *nbase; 2604 2605 if (*base == '.') 2606 base++; 2607 nbase = strdup(base); 2608 if (!nbase) 2609 return -ENOMEM; 2610 2611 /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ 2612 p = strpbrk(nbase, ".@"); 2613 if (p && p != nbase) 2614 *p = '\0'; 2615 2616 /* Try no suffix number */ 2617 ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); 2618 if (ret < 0) { 2619 pr_debug("snprintf() failed: %d\n", ret); 2620 goto out; 2621 } 2622 if (!strlist__has_entry(namelist, buf)) 2623 goto out; 2624 2625 if (!allow_suffix) { 2626 pr_warning("Error: event \"%s\" already exists.\n" 2627 " Hint: Remove existing event by 'perf probe -d'\n" 2628 " or force duplicates by 'perf probe -f'\n" 2629 " or set 'force=yes' in BPF source.\n", 2630 buf); 2631 ret = -EEXIST; 2632 goto out; 2633 } 2634 2635 /* Try to add suffix */ 2636 for (i = 1; i < MAX_EVENT_INDEX; i++) { 2637 ret = e_snprintf(buf, len, "%s_%d", nbase, i); 2638 if (ret < 0) { 2639 pr_debug("snprintf() failed: %d\n", ret); 2640 goto out; 2641 } 2642 if (!strlist__has_entry(namelist, buf)) 2643 break; 2644 } 2645 if (i == MAX_EVENT_INDEX) { 2646 pr_warning("Too many events are on the same function.\n"); 2647 ret = -ERANGE; 2648 } 2649 2650 out: 2651 free(nbase); 2652 2653 /* Final validation */ 2654 if (ret >= 0 && !is_c_func_name(buf)) { 2655 pr_warning("Internal error: \"%s\" is an invalid event name.\n", 2656 buf); 2657 ret = -EINVAL; 2658 } 2659 2660 return ret; 2661 } 2662 2663 /* Warn if the current kernel's uprobe implementation is old */ 2664 static void warn_uprobe_event_compat(struct probe_trace_event *tev) 2665 { 2666 int i; 2667 char *buf = synthesize_probe_trace_command(tev); 2668 struct probe_trace_point *tp = &tev->point; 2669 2670 if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) { 2671 pr_warning("A semaphore is associated with %s:%s and " 2672 "seems your kernel doesn't support it.\n", 2673 tev->group, tev->event); 2674 } 2675 2676 /* Old uprobe event doesn't support memory dereference */ 2677 if (!tev->uprobes || tev->nargs == 0 || !buf) 2678 goto out; 2679 2680 for (i = 0; i < tev->nargs; i++) 2681 if (strglobmatch(tev->args[i].value, "[$@+-]*")) { 2682 pr_warning("Please upgrade your kernel to at least " 2683 "3.14 to have access to feature %s\n", 2684 tev->args[i].value); 2685 break; 2686 } 2687 out: 2688 free(buf); 2689 } 2690 2691 /* Set new name from original perf_probe_event and namelist */ 2692 static int probe_trace_event__set_name(struct probe_trace_event *tev, 2693 struct perf_probe_event *pev, 2694 struct strlist *namelist, 2695 bool allow_suffix) 2696 { 2697 const char *event, *group; 2698 char buf[64]; 2699 int ret; 2700 2701 /* If probe_event or trace_event already have the name, reuse it */ 2702 if (pev->event && !pev->sdt) 2703 event = pev->event; 2704 else if (tev->event) 2705 event = tev->event; 2706 else { 2707 /* Or generate new one from probe point */ 2708 if (pev->point.function && 2709 (strncmp(pev->point.function, "0x", 2) != 0) && 2710 !strisglob(pev->point.function)) 2711 event = pev->point.function; 2712 else 2713 event = tev->point.realname; 2714 } 2715 if (pev->group && !pev->sdt) 2716 group = pev->group; 2717 else if (tev->group) 2718 group = tev->group; 2719 else 2720 group = PERFPROBE_GROUP; 2721 2722 /* Get an unused new event name */ 2723 ret = get_new_event_name(buf, 64, event, namelist, 2724 tev->point.retprobe, allow_suffix); 2725 if (ret < 0) 2726 return ret; 2727 2728 event = buf; 2729 2730 tev->event = strdup(event); 2731 tev->group = strdup(group); 2732 if (tev->event == NULL || tev->group == NULL) 2733 return -ENOMEM; 2734 2735 /* Add added event name to namelist */ 2736 strlist__add(namelist, event); 2737 return 0; 2738 } 2739 2740 static int __open_probe_file_and_namelist(bool uprobe, 2741 struct strlist **namelist) 2742 { 2743 int fd; 2744 2745 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); 2746 if (fd < 0) 2747 return fd; 2748 2749 /* Get current event names */ 2750 *namelist = probe_file__get_namelist(fd); 2751 if (!(*namelist)) { 2752 pr_debug("Failed to get current event list.\n"); 2753 close(fd); 2754 return -ENOMEM; 2755 } 2756 return fd; 2757 } 2758 2759 static int __add_probe_trace_events(struct perf_probe_event *pev, 2760 struct probe_trace_event *tevs, 2761 int ntevs, bool allow_suffix) 2762 { 2763 int i, fd[2] = {-1, -1}, up, ret; 2764 struct probe_trace_event *tev = NULL; 2765 struct probe_cache *cache = NULL; 2766 struct strlist *namelist[2] = {NULL, NULL}; 2767 struct nscookie nsc; 2768 2769 up = pev->uprobes ? 1 : 0; 2770 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); 2771 if (fd[up] < 0) 2772 return fd[up]; 2773 2774 ret = 0; 2775 for (i = 0; i < ntevs; i++) { 2776 tev = &tevs[i]; 2777 up = tev->uprobes ? 1 : 0; 2778 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ 2779 fd[up] = __open_probe_file_and_namelist(up, 2780 &namelist[up]); 2781 if (fd[up] < 0) 2782 goto close_out; 2783 } 2784 /* Skip if the symbol is out of .text or blacklisted */ 2785 if (!tev->point.symbol && !pev->uprobes) 2786 continue; 2787 2788 /* Set new name for tev (and update namelist) */ 2789 ret = probe_trace_event__set_name(tev, pev, namelist[up], 2790 allow_suffix); 2791 if (ret < 0) 2792 break; 2793 2794 nsinfo__mountns_enter(pev->nsi, &nsc); 2795 ret = probe_file__add_event(fd[up], tev); 2796 nsinfo__mountns_exit(&nsc); 2797 if (ret < 0) 2798 break; 2799 2800 /* 2801 * Probes after the first probe which comes from same 2802 * user input are always allowed to add suffix, because 2803 * there might be several addresses corresponding to 2804 * one code line. 2805 */ 2806 allow_suffix = true; 2807 } 2808 if (ret == -EINVAL && pev->uprobes) 2809 warn_uprobe_event_compat(tev); 2810 if (ret == 0 && probe_conf.cache) { 2811 cache = probe_cache__new(pev->target, pev->nsi); 2812 if (!cache || 2813 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || 2814 probe_cache__commit(cache) < 0) 2815 pr_warning("Failed to add event to probe cache\n"); 2816 probe_cache__delete(cache); 2817 } 2818 2819 close_out: 2820 for (up = 0; up < 2; up++) { 2821 strlist__delete(namelist[up]); 2822 if (fd[up] >= 0) 2823 close(fd[up]); 2824 } 2825 return ret; 2826 } 2827 2828 static int find_probe_functions(struct map *map, char *name, 2829 struct symbol **syms) 2830 { 2831 int found = 0; 2832 struct symbol *sym; 2833 struct rb_node *tmp; 2834 const char *norm, *ver; 2835 char *buf = NULL; 2836 bool cut_version = true; 2837 2838 if (map__load(map) < 0) 2839 return 0; 2840 2841 /* If user gives a version, don't cut off the version from symbols */ 2842 if (strchr(name, '@')) 2843 cut_version = false; 2844 2845 map__for_each_symbol(map, sym, tmp) { 2846 norm = arch__normalize_symbol_name(sym->name); 2847 if (!norm) 2848 continue; 2849 2850 if (cut_version) { 2851 /* We don't care about default symbol or not */ 2852 ver = strchr(norm, '@'); 2853 if (ver) { 2854 buf = strndup(norm, ver - norm); 2855 if (!buf) 2856 return -ENOMEM; 2857 norm = buf; 2858 } 2859 } 2860 2861 if (strglobmatch(norm, name)) { 2862 found++; 2863 if (syms && found < probe_conf.max_probes) 2864 syms[found - 1] = sym; 2865 } 2866 if (buf) 2867 zfree(&buf); 2868 } 2869 2870 return found; 2871 } 2872 2873 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, 2874 struct probe_trace_event *tev __maybe_unused, 2875 struct map *map __maybe_unused, 2876 struct symbol *sym __maybe_unused) { } 2877 2878 /* 2879 * Find probe function addresses from map. 2880 * Return an error or the number of found probe_trace_event 2881 */ 2882 static int find_probe_trace_events_from_map(struct perf_probe_event *pev, 2883 struct probe_trace_event **tevs) 2884 { 2885 struct map *map = NULL; 2886 struct ref_reloc_sym *reloc_sym = NULL; 2887 struct symbol *sym; 2888 struct symbol **syms = NULL; 2889 struct probe_trace_event *tev; 2890 struct perf_probe_point *pp = &pev->point; 2891 struct probe_trace_point *tp; 2892 int num_matched_functions; 2893 int ret, i, j, skipped = 0; 2894 char *mod_name; 2895 2896 map = get_target_map(pev->target, pev->nsi, pev->uprobes); 2897 if (!map) { 2898 ret = -EINVAL; 2899 goto out; 2900 } 2901 2902 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); 2903 if (!syms) { 2904 ret = -ENOMEM; 2905 goto out; 2906 } 2907 2908 /* 2909 * Load matched symbols: Since the different local symbols may have 2910 * same name but different addresses, this lists all the symbols. 2911 */ 2912 num_matched_functions = find_probe_functions(map, pp->function, syms); 2913 if (num_matched_functions <= 0) { 2914 pr_err("Failed to find symbol %s in %s\n", pp->function, 2915 pev->target ? : "kernel"); 2916 ret = -ENOENT; 2917 goto out; 2918 } else if (num_matched_functions > probe_conf.max_probes) { 2919 pr_err("Too many functions matched in %s\n", 2920 pev->target ? : "kernel"); 2921 ret = -E2BIG; 2922 goto out; 2923 } 2924 2925 /* Note that the symbols in the kmodule are not relocated */ 2926 if (!pev->uprobes && !pev->target && 2927 (!pp->retprobe || kretprobe_offset_is_supported())) { 2928 reloc_sym = kernel_get_ref_reloc_sym(); 2929 if (!reloc_sym) { 2930 pr_warning("Relocated base symbol is not found!\n"); 2931 ret = -EINVAL; 2932 goto out; 2933 } 2934 } 2935 2936 /* Setup result trace-probe-events */ 2937 *tevs = zalloc(sizeof(*tev) * num_matched_functions); 2938 if (!*tevs) { 2939 ret = -ENOMEM; 2940 goto out; 2941 } 2942 2943 ret = 0; 2944 2945 for (j = 0; j < num_matched_functions; j++) { 2946 sym = syms[j]; 2947 2948 tev = (*tevs) + ret; 2949 tp = &tev->point; 2950 if (ret == num_matched_functions) { 2951 pr_warning("Too many symbols are listed. Skip it.\n"); 2952 break; 2953 } 2954 ret++; 2955 2956 if (pp->offset > sym->end - sym->start) { 2957 pr_warning("Offset %ld is bigger than the size of %s\n", 2958 pp->offset, sym->name); 2959 ret = -ENOENT; 2960 goto err_out; 2961 } 2962 /* Add one probe point */ 2963 tp->address = map->unmap_ip(map, sym->start) + pp->offset; 2964 2965 /* Check the kprobe (not in module) is within .text */ 2966 if (!pev->uprobes && !pev->target && 2967 kprobe_warn_out_range(sym->name, tp->address)) { 2968 tp->symbol = NULL; /* Skip it */ 2969 skipped++; 2970 } else if (reloc_sym) { 2971 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); 2972 tp->offset = tp->address - reloc_sym->addr; 2973 } else { 2974 tp->symbol = strdup_or_goto(sym->name, nomem_out); 2975 tp->offset = pp->offset; 2976 } 2977 tp->realname = strdup_or_goto(sym->name, nomem_out); 2978 2979 tp->retprobe = pp->retprobe; 2980 if (pev->target) { 2981 if (pev->uprobes) { 2982 tev->point.module = strdup_or_goto(pev->target, 2983 nomem_out); 2984 } else { 2985 mod_name = find_module_name(pev->target); 2986 tev->point.module = 2987 strdup(mod_name ? mod_name : pev->target); 2988 free(mod_name); 2989 if (!tev->point.module) 2990 goto nomem_out; 2991 } 2992 } 2993 tev->uprobes = pev->uprobes; 2994 tev->nargs = pev->nargs; 2995 if (tev->nargs) { 2996 tev->args = zalloc(sizeof(struct probe_trace_arg) * 2997 tev->nargs); 2998 if (tev->args == NULL) 2999 goto nomem_out; 3000 } 3001 for (i = 0; i < tev->nargs; i++) { 3002 if (pev->args[i].name) 3003 tev->args[i].name = 3004 strdup_or_goto(pev->args[i].name, 3005 nomem_out); 3006 3007 tev->args[i].value = strdup_or_goto(pev->args[i].var, 3008 nomem_out); 3009 if (pev->args[i].type) 3010 tev->args[i].type = 3011 strdup_or_goto(pev->args[i].type, 3012 nomem_out); 3013 } 3014 arch__fix_tev_from_maps(pev, tev, map, sym); 3015 } 3016 if (ret == skipped) { 3017 ret = -ENOENT; 3018 goto err_out; 3019 } 3020 3021 out: 3022 map__put(map); 3023 free(syms); 3024 return ret; 3025 3026 nomem_out: 3027 ret = -ENOMEM; 3028 err_out: 3029 clear_probe_trace_events(*tevs, num_matched_functions); 3030 zfree(tevs); 3031 goto out; 3032 } 3033 3034 static int try_to_find_absolute_address(struct perf_probe_event *pev, 3035 struct probe_trace_event **tevs) 3036 { 3037 struct perf_probe_point *pp = &pev->point; 3038 struct probe_trace_event *tev; 3039 struct probe_trace_point *tp; 3040 int i, err; 3041 3042 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) 3043 return -EINVAL; 3044 if (perf_probe_event_need_dwarf(pev)) 3045 return -EINVAL; 3046 3047 /* 3048 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at 3049 * absolute address. 3050 * 3051 * Only one tev can be generated by this. 3052 */ 3053 *tevs = zalloc(sizeof(*tev)); 3054 if (!*tevs) 3055 return -ENOMEM; 3056 3057 tev = *tevs; 3058 tp = &tev->point; 3059 3060 /* 3061 * Don't use tp->offset, use address directly, because 3062 * in synthesize_probe_trace_command() address cannot be 3063 * zero. 3064 */ 3065 tp->address = pev->point.abs_address; 3066 tp->retprobe = pp->retprobe; 3067 tev->uprobes = pev->uprobes; 3068 3069 err = -ENOMEM; 3070 /* 3071 * Give it a '0x' leading symbol name. 3072 * In __add_probe_trace_events, a NULL symbol is interpreted as 3073 * invalid. 3074 */ 3075 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) 3076 goto errout; 3077 3078 /* For kprobe, check range */ 3079 if ((!tev->uprobes) && 3080 (kprobe_warn_out_range(tev->point.symbol, 3081 tev->point.address))) { 3082 err = -EACCES; 3083 goto errout; 3084 } 3085 3086 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) 3087 goto errout; 3088 3089 if (pev->target) { 3090 tp->module = strdup(pev->target); 3091 if (!tp->module) 3092 goto errout; 3093 } 3094 3095 if (tev->group) { 3096 tev->group = strdup(pev->group); 3097 if (!tev->group) 3098 goto errout; 3099 } 3100 3101 if (pev->event) { 3102 tev->event = strdup(pev->event); 3103 if (!tev->event) 3104 goto errout; 3105 } 3106 3107 tev->nargs = pev->nargs; 3108 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 3109 if (!tev->args) 3110 goto errout; 3111 3112 for (i = 0; i < tev->nargs; i++) 3113 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); 3114 3115 return 1; 3116 3117 errout: 3118 clear_probe_trace_events(*tevs, 1); 3119 *tevs = NULL; 3120 return err; 3121 } 3122 3123 /* Concatinate two arrays */ 3124 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) 3125 { 3126 void *ret; 3127 3128 ret = malloc(sz_a + sz_b); 3129 if (ret) { 3130 memcpy(ret, a, sz_a); 3131 memcpy(ret + sz_a, b, sz_b); 3132 } 3133 return ret; 3134 } 3135 3136 static int 3137 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, 3138 struct probe_trace_event **tevs2, int ntevs2) 3139 { 3140 struct probe_trace_event *new_tevs; 3141 int ret = 0; 3142 3143 if (*ntevs == 0) { 3144 *tevs = *tevs2; 3145 *ntevs = ntevs2; 3146 *tevs2 = NULL; 3147 return 0; 3148 } 3149 3150 if (*ntevs + ntevs2 > probe_conf.max_probes) 3151 ret = -E2BIG; 3152 else { 3153 /* Concatinate the array of probe_trace_event */ 3154 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), 3155 *tevs2, ntevs2 * sizeof(**tevs2)); 3156 if (!new_tevs) 3157 ret = -ENOMEM; 3158 else { 3159 free(*tevs); 3160 *tevs = new_tevs; 3161 *ntevs += ntevs2; 3162 } 3163 } 3164 if (ret < 0) 3165 clear_probe_trace_events(*tevs2, ntevs2); 3166 zfree(tevs2); 3167 3168 return ret; 3169 } 3170 3171 /* 3172 * Try to find probe_trace_event from given probe caches. Return the number 3173 * of cached events found, if an error occurs return the error. 3174 */ 3175 static int find_cached_events(struct perf_probe_event *pev, 3176 struct probe_trace_event **tevs, 3177 const char *target) 3178 { 3179 struct probe_cache *cache; 3180 struct probe_cache_entry *entry; 3181 struct probe_trace_event *tmp_tevs = NULL; 3182 int ntevs = 0; 3183 int ret = 0; 3184 3185 cache = probe_cache__new(target, pev->nsi); 3186 /* Return 0 ("not found") if the target has no probe cache. */ 3187 if (!cache) 3188 return 0; 3189 3190 for_each_probe_cache_entry(entry, cache) { 3191 /* Skip the cache entry which has no name */ 3192 if (!entry->pev.event || !entry->pev.group) 3193 continue; 3194 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && 3195 strglobmatch(entry->pev.event, pev->event)) { 3196 ret = probe_cache_entry__get_event(entry, &tmp_tevs); 3197 if (ret > 0) 3198 ret = concat_probe_trace_events(tevs, &ntevs, 3199 &tmp_tevs, ret); 3200 if (ret < 0) 3201 break; 3202 } 3203 } 3204 probe_cache__delete(cache); 3205 if (ret < 0) { 3206 clear_probe_trace_events(*tevs, ntevs); 3207 zfree(tevs); 3208 } else { 3209 ret = ntevs; 3210 if (ntevs > 0 && target && target[0] == '/') 3211 pev->uprobes = true; 3212 } 3213 3214 return ret; 3215 } 3216 3217 /* Try to find probe_trace_event from all probe caches */ 3218 static int find_cached_events_all(struct perf_probe_event *pev, 3219 struct probe_trace_event **tevs) 3220 { 3221 struct probe_trace_event *tmp_tevs = NULL; 3222 struct strlist *bidlist; 3223 struct str_node *nd; 3224 char *pathname; 3225 int ntevs = 0; 3226 int ret; 3227 3228 /* Get the buildid list of all valid caches */ 3229 bidlist = build_id_cache__list_all(true); 3230 if (!bidlist) { 3231 ret = -errno; 3232 pr_debug("Failed to get buildids: %d\n", ret); 3233 return ret; 3234 } 3235 3236 ret = 0; 3237 strlist__for_each_entry(nd, bidlist) { 3238 pathname = build_id_cache__origname(nd->s); 3239 ret = find_cached_events(pev, &tmp_tevs, pathname); 3240 /* In the case of cnt == 0, we just skip it */ 3241 if (ret > 0) 3242 ret = concat_probe_trace_events(tevs, &ntevs, 3243 &tmp_tevs, ret); 3244 free(pathname); 3245 if (ret < 0) 3246 break; 3247 } 3248 strlist__delete(bidlist); 3249 3250 if (ret < 0) { 3251 clear_probe_trace_events(*tevs, ntevs); 3252 zfree(tevs); 3253 } else 3254 ret = ntevs; 3255 3256 return ret; 3257 } 3258 3259 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, 3260 struct probe_trace_event **tevs) 3261 { 3262 struct probe_cache *cache; 3263 struct probe_cache_entry *entry; 3264 struct probe_trace_event *tev; 3265 struct str_node *node; 3266 int ret, i; 3267 3268 if (pev->sdt) { 3269 /* For SDT/cached events, we use special search functions */ 3270 if (!pev->target) 3271 return find_cached_events_all(pev, tevs); 3272 else 3273 return find_cached_events(pev, tevs, pev->target); 3274 } 3275 cache = probe_cache__new(pev->target, pev->nsi); 3276 if (!cache) 3277 return 0; 3278 3279 entry = probe_cache__find(cache, pev); 3280 if (!entry) { 3281 /* SDT must be in the cache */ 3282 ret = pev->sdt ? -ENOENT : 0; 3283 goto out; 3284 } 3285 3286 ret = strlist__nr_entries(entry->tevlist); 3287 if (ret > probe_conf.max_probes) { 3288 pr_debug("Too many entries matched in the cache of %s\n", 3289 pev->target ? : "kernel"); 3290 ret = -E2BIG; 3291 goto out; 3292 } 3293 3294 *tevs = zalloc(ret * sizeof(*tev)); 3295 if (!*tevs) { 3296 ret = -ENOMEM; 3297 goto out; 3298 } 3299 3300 i = 0; 3301 strlist__for_each_entry(node, entry->tevlist) { 3302 tev = &(*tevs)[i++]; 3303 ret = parse_probe_trace_command(node->s, tev); 3304 if (ret < 0) 3305 goto out; 3306 /* Set the uprobes attribute as same as original */ 3307 tev->uprobes = pev->uprobes; 3308 } 3309 ret = i; 3310 3311 out: 3312 probe_cache__delete(cache); 3313 return ret; 3314 } 3315 3316 static int convert_to_probe_trace_events(struct perf_probe_event *pev, 3317 struct probe_trace_event **tevs) 3318 { 3319 int ret; 3320 3321 if (!pev->group && !pev->sdt) { 3322 /* Set group name if not given */ 3323 if (!pev->uprobes) { 3324 pev->group = strdup(PERFPROBE_GROUP); 3325 ret = pev->group ? 0 : -ENOMEM; 3326 } else 3327 ret = convert_exec_to_group(pev->target, &pev->group); 3328 if (ret != 0) { 3329 pr_warning("Failed to make a group name.\n"); 3330 return ret; 3331 } 3332 } 3333 3334 ret = try_to_find_absolute_address(pev, tevs); 3335 if (ret > 0) 3336 return ret; 3337 3338 /* At first, we need to lookup cache entry */ 3339 ret = find_probe_trace_events_from_cache(pev, tevs); 3340 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ 3341 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ 3342 3343 /* Convert perf_probe_event with debuginfo */ 3344 ret = try_to_find_probe_trace_events(pev, tevs); 3345 if (ret != 0) 3346 return ret; /* Found in debuginfo or got an error */ 3347 3348 return find_probe_trace_events_from_map(pev, tevs); 3349 } 3350 3351 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3352 { 3353 int i, ret; 3354 3355 /* Loop 1: convert all events */ 3356 for (i = 0; i < npevs; i++) { 3357 /* Init kprobe blacklist if needed */ 3358 if (!pevs[i].uprobes) 3359 kprobe_blacklist__init(); 3360 /* Convert with or without debuginfo */ 3361 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); 3362 if (ret < 0) 3363 return ret; 3364 pevs[i].ntevs = ret; 3365 } 3366 /* This just release blacklist only if allocated */ 3367 kprobe_blacklist__release(); 3368 3369 return 0; 3370 } 3371 3372 static int show_probe_trace_event(struct probe_trace_event *tev) 3373 { 3374 char *buf = synthesize_probe_trace_command(tev); 3375 3376 if (!buf) { 3377 pr_debug("Failed to synthesize probe trace event.\n"); 3378 return -EINVAL; 3379 } 3380 3381 /* Showing definition always go stdout */ 3382 printf("%s\n", buf); 3383 free(buf); 3384 3385 return 0; 3386 } 3387 3388 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) 3389 { 3390 struct strlist *namelist = strlist__new(NULL, NULL); 3391 struct probe_trace_event *tev; 3392 struct perf_probe_event *pev; 3393 int i, j, ret = 0; 3394 3395 if (!namelist) 3396 return -ENOMEM; 3397 3398 for (j = 0; j < npevs && !ret; j++) { 3399 pev = &pevs[j]; 3400 for (i = 0; i < pev->ntevs && !ret; i++) { 3401 tev = &pev->tevs[i]; 3402 /* Skip if the symbol is out of .text or blacklisted */ 3403 if (!tev->point.symbol && !pev->uprobes) 3404 continue; 3405 3406 /* Set new name for tev (and update namelist) */ 3407 ret = probe_trace_event__set_name(tev, pev, 3408 namelist, true); 3409 if (!ret) 3410 ret = show_probe_trace_event(tev); 3411 } 3412 } 3413 strlist__delete(namelist); 3414 3415 return ret; 3416 } 3417 3418 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3419 { 3420 int i, ret = 0; 3421 3422 /* Loop 2: add all events */ 3423 for (i = 0; i < npevs; i++) { 3424 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, 3425 pevs[i].ntevs, 3426 probe_conf.force_add); 3427 if (ret < 0) 3428 break; 3429 } 3430 return ret; 3431 } 3432 3433 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3434 { 3435 int i, j; 3436 struct perf_probe_event *pev; 3437 3438 /* Loop 3: cleanup and free trace events */ 3439 for (i = 0; i < npevs; i++) { 3440 pev = &pevs[i]; 3441 for (j = 0; j < pevs[i].ntevs; j++) 3442 clear_probe_trace_event(&pevs[i].tevs[j]); 3443 zfree(&pevs[i].tevs); 3444 pevs[i].ntevs = 0; 3445 nsinfo__zput(pev->nsi); 3446 clear_perf_probe_event(&pevs[i]); 3447 } 3448 } 3449 3450 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3451 { 3452 int ret; 3453 3454 ret = init_probe_symbol_maps(pevs->uprobes); 3455 if (ret < 0) 3456 return ret; 3457 3458 ret = convert_perf_probe_events(pevs, npevs); 3459 if (ret == 0) 3460 ret = apply_perf_probe_events(pevs, npevs); 3461 3462 cleanup_perf_probe_events(pevs, npevs); 3463 3464 exit_probe_symbol_maps(); 3465 return ret; 3466 } 3467 3468 int del_perf_probe_events(struct strfilter *filter) 3469 { 3470 int ret, ret2, ufd = -1, kfd = -1; 3471 char *str = strfilter__string(filter); 3472 3473 if (!str) 3474 return -EINVAL; 3475 3476 /* Get current event names */ 3477 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); 3478 if (ret < 0) 3479 goto out; 3480 3481 ret = probe_file__del_events(kfd, filter); 3482 if (ret < 0 && ret != -ENOENT) 3483 goto error; 3484 3485 ret2 = probe_file__del_events(ufd, filter); 3486 if (ret2 < 0 && ret2 != -ENOENT) { 3487 ret = ret2; 3488 goto error; 3489 } 3490 ret = 0; 3491 3492 error: 3493 if (kfd >= 0) 3494 close(kfd); 3495 if (ufd >= 0) 3496 close(ufd); 3497 out: 3498 free(str); 3499 3500 return ret; 3501 } 3502 3503 int show_available_funcs(const char *target, struct nsinfo *nsi, 3504 struct strfilter *_filter, bool user) 3505 { 3506 struct rb_node *nd; 3507 struct map *map; 3508 int ret; 3509 3510 ret = init_probe_symbol_maps(user); 3511 if (ret < 0) 3512 return ret; 3513 3514 /* Get a symbol map */ 3515 map = get_target_map(target, nsi, user); 3516 if (!map) { 3517 pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); 3518 return -EINVAL; 3519 } 3520 3521 ret = map__load(map); 3522 if (ret) { 3523 if (ret == -2) { 3524 char *str = strfilter__string(_filter); 3525 pr_err("Failed to find symbols matched to \"%s\"\n", 3526 str); 3527 free(str); 3528 } else 3529 pr_err("Failed to load symbols in %s\n", 3530 (target) ? : "kernel"); 3531 goto end; 3532 } 3533 if (!dso__sorted_by_name(map->dso)) 3534 dso__sort_by_name(map->dso); 3535 3536 /* Show all (filtered) symbols */ 3537 setup_pager(); 3538 3539 for (nd = rb_first_cached(&map->dso->symbol_names); nd; 3540 nd = rb_next(nd)) { 3541 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 3542 3543 if (strfilter__compare(_filter, pos->sym.name)) 3544 printf("%s\n", pos->sym.name); 3545 } 3546 end: 3547 map__put(map); 3548 exit_probe_symbol_maps(); 3549 3550 return ret; 3551 } 3552 3553 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, 3554 struct perf_probe_arg *pvar) 3555 { 3556 tvar->value = strdup(pvar->var); 3557 if (tvar->value == NULL) 3558 return -ENOMEM; 3559 if (pvar->type) { 3560 tvar->type = strdup(pvar->type); 3561 if (tvar->type == NULL) 3562 return -ENOMEM; 3563 } 3564 if (pvar->name) { 3565 tvar->name = strdup(pvar->name); 3566 if (tvar->name == NULL) 3567 return -ENOMEM; 3568 } else 3569 tvar->name = NULL; 3570 return 0; 3571 } 3572