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