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 <sys/utsname.h> 23 #include <sys/types.h> 24 #include <sys/stat.h> 25 #include <fcntl.h> 26 #include <errno.h> 27 #include <stdio.h> 28 #include <unistd.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <stdarg.h> 32 #include <limits.h> 33 #include <elf.h> 34 35 #include "util.h" 36 #include "event.h" 37 #include "strlist.h" 38 #include "debug.h" 39 #include "cache.h" 40 #include "color.h" 41 #include "symbol.h" 42 #include "thread.h" 43 #include <api/fs/fs.h> 44 #include "trace-event.h" /* For __maybe_unused */ 45 #include "probe-event.h" 46 #include "probe-finder.h" 47 #include "probe-file.h" 48 #include "session.h" 49 50 #define MAX_CMDLEN 256 51 #define PERFPROBE_GROUP "probe" 52 53 bool probe_event_dry_run; /* Dry run flag */ 54 struct probe_conf probe_conf; 55 56 #define semantic_error(msg ...) pr_err("Semantic error :" msg) 57 58 int e_snprintf(char *str, size_t size, const char *format, ...) 59 { 60 int ret; 61 va_list ap; 62 va_start(ap, format); 63 ret = vsnprintf(str, size, format, ap); 64 va_end(ap); 65 if (ret >= (int)size) 66 ret = -E2BIG; 67 return ret; 68 } 69 70 static struct machine *host_machine; 71 72 /* Initialize symbol maps and path of vmlinux/modules */ 73 int init_probe_symbol_maps(bool user_only) 74 { 75 int ret; 76 77 symbol_conf.sort_by_name = true; 78 symbol_conf.allow_aliases = true; 79 ret = symbol__init(NULL); 80 if (ret < 0) { 81 pr_debug("Failed to init symbol map.\n"); 82 goto out; 83 } 84 85 if (host_machine || user_only) /* already initialized */ 86 return 0; 87 88 if (symbol_conf.vmlinux_name) 89 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); 90 91 host_machine = machine__new_host(); 92 if (!host_machine) { 93 pr_debug("machine__new_host() failed.\n"); 94 symbol__exit(); 95 ret = -1; 96 } 97 out: 98 if (ret < 0) 99 pr_warning("Failed to init vmlinux path.\n"); 100 return ret; 101 } 102 103 void exit_probe_symbol_maps(void) 104 { 105 machine__delete(host_machine); 106 host_machine = NULL; 107 symbol__exit(); 108 } 109 110 static struct symbol *__find_kernel_function_by_name(const char *name, 111 struct map **mapp) 112 { 113 return machine__find_kernel_function_by_name(host_machine, name, mapp); 114 } 115 116 static struct symbol *__find_kernel_function(u64 addr, struct map **mapp) 117 { 118 return machine__find_kernel_function(host_machine, addr, mapp); 119 } 120 121 static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) 122 { 123 /* kmap->ref_reloc_sym should be set if host_machine is initialized */ 124 struct kmap *kmap; 125 struct map *map = machine__kernel_map(host_machine); 126 127 if (map__load(map) < 0) 128 return NULL; 129 130 kmap = map__kmap(map); 131 if (!kmap) 132 return NULL; 133 return kmap->ref_reloc_sym; 134 } 135 136 static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, 137 bool reloc, bool reladdr) 138 { 139 struct ref_reloc_sym *reloc_sym; 140 struct symbol *sym; 141 struct map *map; 142 143 /* ref_reloc_sym is just a label. Need a special fix*/ 144 reloc_sym = kernel_get_ref_reloc_sym(); 145 if (reloc_sym && strcmp(name, reloc_sym->name) == 0) 146 *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; 147 else { 148 sym = __find_kernel_function_by_name(name, &map); 149 if (!sym) 150 return -ENOENT; 151 *addr = map->unmap_ip(map, sym->start) - 152 ((reloc) ? 0 : map->reloc) - 153 ((reladdr) ? map->start : 0); 154 } 155 return 0; 156 } 157 158 static struct map *kernel_get_module_map(const char *module) 159 { 160 struct map_groups *grp = &host_machine->kmaps; 161 struct maps *maps = &grp->maps[MAP__FUNCTION]; 162 struct map *pos; 163 164 /* A file path -- this is an offline module */ 165 if (module && strchr(module, '/')) 166 return machine__findnew_module_map(host_machine, 0, module); 167 168 if (!module) 169 module = "kernel"; 170 171 for (pos = maps__first(maps); pos; pos = map__next(pos)) { 172 /* short_name is "[module]" */ 173 if (strncmp(pos->dso->short_name + 1, module, 174 pos->dso->short_name_len - 2) == 0 && 175 module[pos->dso->short_name_len - 2] == '\0') { 176 return pos; 177 } 178 } 179 return NULL; 180 } 181 182 struct map *get_target_map(const char *target, bool user) 183 { 184 /* Init maps of given executable or kernel */ 185 if (user) 186 return dso__new_map(target); 187 else 188 return kernel_get_module_map(target); 189 } 190 191 static void put_target_map(struct map *map, bool user) 192 { 193 if (map && user) { 194 /* Only the user map needs to be released */ 195 map__put(map); 196 } 197 } 198 199 200 static int convert_exec_to_group(const char *exec, char **result) 201 { 202 char *ptr1, *ptr2, *exec_copy; 203 char buf[64]; 204 int ret; 205 206 exec_copy = strdup(exec); 207 if (!exec_copy) 208 return -ENOMEM; 209 210 ptr1 = basename(exec_copy); 211 if (!ptr1) { 212 ret = -EINVAL; 213 goto out; 214 } 215 216 for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { 217 if (!isalnum(*ptr2) && *ptr2 != '_') { 218 *ptr2 = '\0'; 219 break; 220 } 221 } 222 223 ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); 224 if (ret < 0) 225 goto out; 226 227 *result = strdup(buf); 228 ret = *result ? 0 : -ENOMEM; 229 230 out: 231 free(exec_copy); 232 return ret; 233 } 234 235 static void clear_perf_probe_point(struct perf_probe_point *pp) 236 { 237 free(pp->file); 238 free(pp->function); 239 free(pp->lazy_line); 240 } 241 242 static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) 243 { 244 int i; 245 246 for (i = 0; i < ntevs; i++) 247 clear_probe_trace_event(tevs + i); 248 } 249 250 static bool kprobe_blacklist__listed(unsigned long address); 251 static bool kprobe_warn_out_range(const char *symbol, unsigned long address) 252 { 253 u64 etext_addr = 0; 254 int ret; 255 256 /* Get the address of _etext for checking non-probable text symbol */ 257 ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, 258 false, false); 259 260 if (ret == 0 && etext_addr < address) 261 pr_warning("%s is out of .text, skip it.\n", symbol); 262 else if (kprobe_blacklist__listed(address)) 263 pr_warning("%s is blacklisted function, skip it.\n", symbol); 264 else 265 return false; 266 267 return true; 268 } 269 270 /* 271 * NOTE: 272 * '.gnu.linkonce.this_module' section of kernel module elf directly 273 * maps to 'struct module' from linux/module.h. This section contains 274 * actual module name which will be used by kernel after loading it. 275 * But, we cannot use 'struct module' here since linux/module.h is not 276 * exposed to user-space. Offset of 'name' has remained same from long 277 * time, so hardcoding it here. 278 */ 279 #ifdef __LP64__ 280 #define MOD_NAME_OFFSET 24 281 #else 282 #define MOD_NAME_OFFSET 12 283 #endif 284 285 /* 286 * @module can be module name of module file path. In case of path, 287 * inspect elf and find out what is actual module name. 288 * Caller has to free mod_name after using it. 289 */ 290 static char *find_module_name(const char *module) 291 { 292 int fd; 293 Elf *elf; 294 GElf_Ehdr ehdr; 295 GElf_Shdr shdr; 296 Elf_Data *data; 297 Elf_Scn *sec; 298 char *mod_name = NULL; 299 300 fd = open(module, O_RDONLY); 301 if (fd < 0) 302 return NULL; 303 304 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 305 if (elf == NULL) 306 goto elf_err; 307 308 if (gelf_getehdr(elf, &ehdr) == NULL) 309 goto ret_err; 310 311 sec = elf_section_by_name(elf, &ehdr, &shdr, 312 ".gnu.linkonce.this_module", NULL); 313 if (!sec) 314 goto ret_err; 315 316 data = elf_getdata(sec, NULL); 317 if (!data || !data->d_buf) 318 goto ret_err; 319 320 mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET); 321 322 ret_err: 323 elf_end(elf); 324 elf_err: 325 close(fd); 326 return mod_name; 327 } 328 329 #ifdef HAVE_DWARF_SUPPORT 330 331 static int kernel_get_module_dso(const char *module, struct dso **pdso) 332 { 333 struct dso *dso; 334 struct map *map; 335 const char *vmlinux_name; 336 int ret = 0; 337 338 if (module) { 339 char module_name[128]; 340 341 snprintf(module_name, sizeof(module_name), "[%s]", module); 342 map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name); 343 if (map) { 344 dso = map->dso; 345 goto found; 346 } 347 pr_debug("Failed to find module %s.\n", module); 348 return -ENOENT; 349 } 350 351 map = machine__kernel_map(host_machine); 352 dso = map->dso; 353 354 vmlinux_name = symbol_conf.vmlinux_name; 355 dso->load_errno = 0; 356 if (vmlinux_name) 357 ret = dso__load_vmlinux(dso, map, vmlinux_name, false); 358 else 359 ret = dso__load_vmlinux_path(dso, map); 360 found: 361 *pdso = dso; 362 return ret; 363 } 364 365 /* 366 * Some binaries like glibc have special symbols which are on the symbol 367 * table, but not in the debuginfo. If we can find the address of the 368 * symbol from map, we can translate the address back to the probe point. 369 */ 370 static int find_alternative_probe_point(struct debuginfo *dinfo, 371 struct perf_probe_point *pp, 372 struct perf_probe_point *result, 373 const char *target, bool uprobes) 374 { 375 struct map *map = NULL; 376 struct symbol *sym; 377 u64 address = 0; 378 int ret = -ENOENT; 379 380 /* This can work only for function-name based one */ 381 if (!pp->function || pp->file) 382 return -ENOTSUP; 383 384 map = get_target_map(target, uprobes); 385 if (!map) 386 return -EINVAL; 387 388 /* Find the address of given function */ 389 map__for_each_symbol_by_name(map, pp->function, sym) { 390 if (uprobes) 391 address = sym->start; 392 else 393 address = map->unmap_ip(map, sym->start) - map->reloc; 394 break; 395 } 396 if (!address) { 397 ret = -ENOENT; 398 goto out; 399 } 400 pr_debug("Symbol %s address found : %" PRIx64 "\n", 401 pp->function, address); 402 403 ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, 404 result); 405 if (ret <= 0) 406 ret = (!ret) ? -ENOENT : ret; 407 else { 408 result->offset += pp->offset; 409 result->line += pp->line; 410 result->retprobe = pp->retprobe; 411 ret = 0; 412 } 413 414 out: 415 put_target_map(map, uprobes); 416 return ret; 417 418 } 419 420 static int get_alternative_probe_event(struct debuginfo *dinfo, 421 struct perf_probe_event *pev, 422 struct perf_probe_point *tmp) 423 { 424 int ret; 425 426 memcpy(tmp, &pev->point, sizeof(*tmp)); 427 memset(&pev->point, 0, sizeof(pev->point)); 428 ret = find_alternative_probe_point(dinfo, tmp, &pev->point, 429 pev->target, pev->uprobes); 430 if (ret < 0) 431 memcpy(&pev->point, tmp, sizeof(*tmp)); 432 433 return ret; 434 } 435 436 static int get_alternative_line_range(struct debuginfo *dinfo, 437 struct line_range *lr, 438 const char *target, bool user) 439 { 440 struct perf_probe_point pp = { .function = lr->function, 441 .file = lr->file, 442 .line = lr->start }; 443 struct perf_probe_point result; 444 int ret, len = 0; 445 446 memset(&result, 0, sizeof(result)); 447 448 if (lr->end != INT_MAX) 449 len = lr->end - lr->start; 450 ret = find_alternative_probe_point(dinfo, &pp, &result, 451 target, user); 452 if (!ret) { 453 lr->function = result.function; 454 lr->file = result.file; 455 lr->start = result.line; 456 if (lr->end != INT_MAX) 457 lr->end = lr->start + len; 458 clear_perf_probe_point(&pp); 459 } 460 return ret; 461 } 462 463 /* Open new debuginfo of given module */ 464 static struct debuginfo *open_debuginfo(const char *module, bool silent) 465 { 466 const char *path = module; 467 char reason[STRERR_BUFSIZE]; 468 struct debuginfo *ret = NULL; 469 struct dso *dso = NULL; 470 int err; 471 472 if (!module || !strchr(module, '/')) { 473 err = kernel_get_module_dso(module, &dso); 474 if (err < 0) { 475 if (!dso || dso->load_errno == 0) { 476 if (!str_error_r(-err, reason, STRERR_BUFSIZE)) 477 strcpy(reason, "(unknown)"); 478 } else 479 dso__strerror_load(dso, reason, STRERR_BUFSIZE); 480 if (!silent) 481 pr_err("Failed to find the path for %s: %s\n", 482 module ?: "kernel", reason); 483 return NULL; 484 } 485 path = dso->long_name; 486 } 487 ret = debuginfo__new(path); 488 if (!ret && !silent) { 489 pr_warning("The %s file has no debug information.\n", path); 490 if (!module || !strtailcmp(path, ".ko")) 491 pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); 492 else 493 pr_warning("Rebuild with -g, "); 494 pr_warning("or install an appropriate debuginfo package.\n"); 495 } 496 return ret; 497 } 498 499 /* For caching the last debuginfo */ 500 static struct debuginfo *debuginfo_cache; 501 static char *debuginfo_cache_path; 502 503 static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) 504 { 505 const char *path = module; 506 507 /* If the module is NULL, it should be the kernel. */ 508 if (!module) 509 path = "kernel"; 510 511 if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) 512 goto out; 513 514 /* Copy module path */ 515 free(debuginfo_cache_path); 516 debuginfo_cache_path = strdup(path); 517 if (!debuginfo_cache_path) { 518 debuginfo__delete(debuginfo_cache); 519 debuginfo_cache = NULL; 520 goto out; 521 } 522 523 debuginfo_cache = open_debuginfo(module, silent); 524 if (!debuginfo_cache) 525 zfree(&debuginfo_cache_path); 526 out: 527 return debuginfo_cache; 528 } 529 530 static void debuginfo_cache__exit(void) 531 { 532 debuginfo__delete(debuginfo_cache); 533 debuginfo_cache = NULL; 534 zfree(&debuginfo_cache_path); 535 } 536 537 538 static int get_text_start_address(const char *exec, unsigned long *address) 539 { 540 Elf *elf; 541 GElf_Ehdr ehdr; 542 GElf_Shdr shdr; 543 int fd, ret = -ENOENT; 544 545 fd = open(exec, O_RDONLY); 546 if (fd < 0) 547 return -errno; 548 549 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); 550 if (elf == NULL) { 551 ret = -EINVAL; 552 goto out_close; 553 } 554 555 if (gelf_getehdr(elf, &ehdr) == NULL) 556 goto out; 557 558 if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) 559 goto out; 560 561 *address = shdr.sh_addr - shdr.sh_offset; 562 ret = 0; 563 out: 564 elf_end(elf); 565 out_close: 566 close(fd); 567 568 return ret; 569 } 570 571 /* 572 * Convert trace point to probe point with debuginfo 573 */ 574 static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, 575 struct perf_probe_point *pp, 576 bool is_kprobe) 577 { 578 struct debuginfo *dinfo = NULL; 579 unsigned long stext = 0; 580 u64 addr = tp->address; 581 int ret = -ENOENT; 582 583 /* convert the address to dwarf address */ 584 if (!is_kprobe) { 585 if (!addr) { 586 ret = -EINVAL; 587 goto error; 588 } 589 ret = get_text_start_address(tp->module, &stext); 590 if (ret < 0) 591 goto error; 592 addr += stext; 593 } else if (tp->symbol) { 594 /* If the module is given, this returns relative address */ 595 ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, 596 false, !!tp->module); 597 if (ret != 0) 598 goto error; 599 addr += tp->offset; 600 } 601 602 pr_debug("try to find information at %" PRIx64 " in %s\n", addr, 603 tp->module ? : "kernel"); 604 605 dinfo = debuginfo_cache__open(tp->module, verbose == 0); 606 if (dinfo) 607 ret = debuginfo__find_probe_point(dinfo, 608 (unsigned long)addr, pp); 609 else 610 ret = -ENOENT; 611 612 if (ret > 0) { 613 pp->retprobe = tp->retprobe; 614 return 0; 615 } 616 error: 617 pr_debug("Failed to find corresponding probes from debuginfo.\n"); 618 return ret ? : -ENOENT; 619 } 620 621 static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, 622 int ntevs, const char *exec) 623 { 624 int i, ret = 0; 625 unsigned long stext = 0; 626 627 if (!exec) 628 return 0; 629 630 ret = get_text_start_address(exec, &stext); 631 if (ret < 0) 632 return ret; 633 634 for (i = 0; i < ntevs && ret >= 0; i++) { 635 /* point.address is the addres of point.symbol + point.offset */ 636 tevs[i].point.address -= stext; 637 tevs[i].point.module = strdup(exec); 638 if (!tevs[i].point.module) { 639 ret = -ENOMEM; 640 break; 641 } 642 tevs[i].uprobes = true; 643 } 644 645 return ret; 646 } 647 648 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs, 649 int ntevs, const char *module) 650 { 651 int i, ret = 0; 652 char *mod_name = NULL; 653 654 if (!module) 655 return 0; 656 657 mod_name = find_module_name(module); 658 659 for (i = 0; i < ntevs; i++) { 660 tevs[i].point.module = 661 strdup(mod_name ? mod_name : module); 662 if (!tevs[i].point.module) { 663 ret = -ENOMEM; 664 break; 665 } 666 } 667 668 free(mod_name); 669 return ret; 670 } 671 672 static int 673 post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, 674 int ntevs) 675 { 676 struct ref_reloc_sym *reloc_sym; 677 char *tmp; 678 int i, skipped = 0; 679 680 /* Skip post process if the target is an offline kernel */ 681 if (symbol_conf.ignore_vmlinux_buildid) 682 return 0; 683 684 reloc_sym = kernel_get_ref_reloc_sym(); 685 if (!reloc_sym) { 686 pr_warning("Relocated base symbol is not found!\n"); 687 return -EINVAL; 688 } 689 690 for (i = 0; i < ntevs; i++) { 691 if (!tevs[i].point.address || tevs[i].point.retprobe) 692 continue; 693 /* If we found a wrong one, mark it by NULL symbol */ 694 if (kprobe_warn_out_range(tevs[i].point.symbol, 695 tevs[i].point.address)) { 696 tmp = NULL; 697 skipped++; 698 } else { 699 tmp = strdup(reloc_sym->name); 700 if (!tmp) 701 return -ENOMEM; 702 } 703 /* If we have no realname, use symbol for it */ 704 if (!tevs[i].point.realname) 705 tevs[i].point.realname = tevs[i].point.symbol; 706 else 707 free(tevs[i].point.symbol); 708 tevs[i].point.symbol = tmp; 709 tevs[i].point.offset = tevs[i].point.address - 710 reloc_sym->unrelocated_addr; 711 } 712 return skipped; 713 } 714 715 void __weak 716 arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, 717 int ntevs __maybe_unused) 718 { 719 } 720 721 /* Post processing the probe events */ 722 static int post_process_probe_trace_events(struct perf_probe_event *pev, 723 struct probe_trace_event *tevs, 724 int ntevs, const char *module, 725 bool uprobe) 726 { 727 int ret; 728 729 if (uprobe) 730 ret = add_exec_to_probe_trace_events(tevs, ntevs, module); 731 else if (module) 732 /* Currently ref_reloc_sym based probe is not for drivers */ 733 ret = add_module_to_probe_trace_events(tevs, ntevs, module); 734 else 735 ret = post_process_kernel_probe_trace_events(tevs, ntevs); 736 737 if (ret >= 0) 738 arch__post_process_probe_trace_events(pev, ntevs); 739 740 return ret; 741 } 742 743 /* Try to find perf_probe_event with debuginfo */ 744 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 745 struct probe_trace_event **tevs) 746 { 747 bool need_dwarf = perf_probe_event_need_dwarf(pev); 748 struct perf_probe_point tmp; 749 struct debuginfo *dinfo; 750 int ntevs, ret = 0; 751 752 dinfo = open_debuginfo(pev->target, !need_dwarf); 753 if (!dinfo) { 754 if (need_dwarf) 755 return -ENOENT; 756 pr_debug("Could not open debuginfo. Try to use symbols.\n"); 757 return 0; 758 } 759 760 pr_debug("Try to find probe point from debuginfo.\n"); 761 /* Searching trace events corresponding to a probe event */ 762 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 763 764 if (ntevs == 0) { /* Not found, retry with an alternative */ 765 ret = get_alternative_probe_event(dinfo, pev, &tmp); 766 if (!ret) { 767 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); 768 /* 769 * Write back to the original probe_event for 770 * setting appropriate (user given) event name 771 */ 772 clear_perf_probe_point(&pev->point); 773 memcpy(&pev->point, &tmp, sizeof(tmp)); 774 } 775 } 776 777 debuginfo__delete(dinfo); 778 779 if (ntevs > 0) { /* Succeeded to find trace events */ 780 pr_debug("Found %d probe_trace_events.\n", ntevs); 781 ret = post_process_probe_trace_events(pev, *tevs, ntevs, 782 pev->target, pev->uprobes); 783 if (ret < 0 || ret == ntevs) { 784 clear_probe_trace_events(*tevs, ntevs); 785 zfree(tevs); 786 } 787 if (ret != ntevs) 788 return ret < 0 ? ret : ntevs; 789 ntevs = 0; 790 /* Fall through */ 791 } 792 793 if (ntevs == 0) { /* No error but failed to find probe point. */ 794 pr_warning("Probe point '%s' not found.\n", 795 synthesize_perf_probe_point(&pev->point)); 796 return -ENOENT; 797 } 798 /* Error path : ntevs < 0 */ 799 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); 800 if (ntevs < 0) { 801 if (ntevs == -EBADF) 802 pr_warning("Warning: No dwarf info found in the vmlinux - " 803 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); 804 if (!need_dwarf) { 805 pr_debug("Trying to use symbols.\n"); 806 return 0; 807 } 808 } 809 return ntevs; 810 } 811 812 #define LINEBUF_SIZE 256 813 #define NR_ADDITIONAL_LINES 2 814 815 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) 816 { 817 char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; 818 const char *color = show_num ? "" : PERF_COLOR_BLUE; 819 const char *prefix = NULL; 820 821 do { 822 if (fgets(buf, LINEBUF_SIZE, fp) == NULL) 823 goto error; 824 if (skip) 825 continue; 826 if (!prefix) { 827 prefix = show_num ? "%7d " : " "; 828 color_fprintf(stdout, color, prefix, l); 829 } 830 color_fprintf(stdout, color, "%s", buf); 831 832 } while (strchr(buf, '\n') == NULL); 833 834 return 1; 835 error: 836 if (ferror(fp)) { 837 pr_warning("File read error: %s\n", 838 str_error_r(errno, sbuf, sizeof(sbuf))); 839 return -1; 840 } 841 return 0; 842 } 843 844 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) 845 { 846 int rv = __show_one_line(fp, l, skip, show_num); 847 if (rv == 0) { 848 pr_warning("Source file is shorter than expected.\n"); 849 rv = -1; 850 } 851 return rv; 852 } 853 854 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) 855 #define show_one_line(f,l) _show_one_line(f,l,false,false) 856 #define skip_one_line(f,l) _show_one_line(f,l,true,false) 857 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) 858 859 /* 860 * Show line-range always requires debuginfo to find source file and 861 * line number. 862 */ 863 static int __show_line_range(struct line_range *lr, const char *module, 864 bool user) 865 { 866 int l = 1; 867 struct int_node *ln; 868 struct debuginfo *dinfo; 869 FILE *fp; 870 int ret; 871 char *tmp; 872 char sbuf[STRERR_BUFSIZE]; 873 874 /* Search a line range */ 875 dinfo = open_debuginfo(module, false); 876 if (!dinfo) 877 return -ENOENT; 878 879 ret = debuginfo__find_line_range(dinfo, lr); 880 if (!ret) { /* Not found, retry with an alternative */ 881 ret = get_alternative_line_range(dinfo, lr, module, user); 882 if (!ret) 883 ret = debuginfo__find_line_range(dinfo, lr); 884 } 885 debuginfo__delete(dinfo); 886 if (ret == 0 || ret == -ENOENT) { 887 pr_warning("Specified source line is not found.\n"); 888 return -ENOENT; 889 } else if (ret < 0) { 890 pr_warning("Debuginfo analysis failed.\n"); 891 return ret; 892 } 893 894 /* Convert source file path */ 895 tmp = lr->path; 896 ret = get_real_path(tmp, lr->comp_dir, &lr->path); 897 898 /* Free old path when new path is assigned */ 899 if (tmp != lr->path) 900 free(tmp); 901 902 if (ret < 0) { 903 pr_warning("Failed to find source file path.\n"); 904 return ret; 905 } 906 907 setup_pager(); 908 909 if (lr->function) 910 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, 911 lr->start - lr->offset); 912 else 913 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); 914 915 fp = fopen(lr->path, "r"); 916 if (fp == NULL) { 917 pr_warning("Failed to open %s: %s\n", lr->path, 918 str_error_r(errno, sbuf, sizeof(sbuf))); 919 return -errno; 920 } 921 /* Skip to starting line number */ 922 while (l < lr->start) { 923 ret = skip_one_line(fp, l++); 924 if (ret < 0) 925 goto end; 926 } 927 928 intlist__for_each_entry(ln, lr->line_list) { 929 for (; ln->i > l; l++) { 930 ret = show_one_line(fp, l - lr->offset); 931 if (ret < 0) 932 goto end; 933 } 934 ret = show_one_line_with_num(fp, l++ - lr->offset); 935 if (ret < 0) 936 goto end; 937 } 938 939 if (lr->end == INT_MAX) 940 lr->end = l + NR_ADDITIONAL_LINES; 941 while (l <= lr->end) { 942 ret = show_one_line_or_eof(fp, l++ - lr->offset); 943 if (ret <= 0) 944 break; 945 } 946 end: 947 fclose(fp); 948 return ret; 949 } 950 951 int show_line_range(struct line_range *lr, const char *module, bool user) 952 { 953 int ret; 954 955 ret = init_probe_symbol_maps(user); 956 if (ret < 0) 957 return ret; 958 ret = __show_line_range(lr, module, user); 959 exit_probe_symbol_maps(); 960 961 return ret; 962 } 963 964 static int show_available_vars_at(struct debuginfo *dinfo, 965 struct perf_probe_event *pev, 966 struct strfilter *_filter) 967 { 968 char *buf; 969 int ret, i, nvars; 970 struct str_node *node; 971 struct variable_list *vls = NULL, *vl; 972 struct perf_probe_point tmp; 973 const char *var; 974 975 buf = synthesize_perf_probe_point(&pev->point); 976 if (!buf) 977 return -EINVAL; 978 pr_debug("Searching variables at %s\n", buf); 979 980 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); 981 if (!ret) { /* Not found, retry with an alternative */ 982 ret = get_alternative_probe_event(dinfo, pev, &tmp); 983 if (!ret) { 984 ret = debuginfo__find_available_vars_at(dinfo, pev, 985 &vls); 986 /* Release the old probe_point */ 987 clear_perf_probe_point(&tmp); 988 } 989 } 990 if (ret <= 0) { 991 if (ret == 0 || ret == -ENOENT) { 992 pr_err("Failed to find the address of %s\n", buf); 993 ret = -ENOENT; 994 } else 995 pr_warning("Debuginfo analysis failed.\n"); 996 goto end; 997 } 998 999 /* Some variables are found */ 1000 fprintf(stdout, "Available variables at %s\n", buf); 1001 for (i = 0; i < ret; i++) { 1002 vl = &vls[i]; 1003 /* 1004 * A probe point might be converted to 1005 * several trace points. 1006 */ 1007 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, 1008 vl->point.offset); 1009 zfree(&vl->point.symbol); 1010 nvars = 0; 1011 if (vl->vars) { 1012 strlist__for_each_entry(node, vl->vars) { 1013 var = strchr(node->s, '\t') + 1; 1014 if (strfilter__compare(_filter, var)) { 1015 fprintf(stdout, "\t\t%s\n", node->s); 1016 nvars++; 1017 } 1018 } 1019 strlist__delete(vl->vars); 1020 } 1021 if (nvars == 0) 1022 fprintf(stdout, "\t\t(No matched variables)\n"); 1023 } 1024 free(vls); 1025 end: 1026 free(buf); 1027 return ret; 1028 } 1029 1030 /* Show available variables on given probe point */ 1031 int show_available_vars(struct perf_probe_event *pevs, int npevs, 1032 struct strfilter *_filter) 1033 { 1034 int i, ret = 0; 1035 struct debuginfo *dinfo; 1036 1037 ret = init_probe_symbol_maps(pevs->uprobes); 1038 if (ret < 0) 1039 return ret; 1040 1041 dinfo = open_debuginfo(pevs->target, false); 1042 if (!dinfo) { 1043 ret = -ENOENT; 1044 goto out; 1045 } 1046 1047 setup_pager(); 1048 1049 for (i = 0; i < npevs && ret >= 0; i++) 1050 ret = show_available_vars_at(dinfo, &pevs[i], _filter); 1051 1052 debuginfo__delete(dinfo); 1053 out: 1054 exit_probe_symbol_maps(); 1055 return ret; 1056 } 1057 1058 #else /* !HAVE_DWARF_SUPPORT */ 1059 1060 static void debuginfo_cache__exit(void) 1061 { 1062 } 1063 1064 static int 1065 find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, 1066 struct perf_probe_point *pp __maybe_unused, 1067 bool is_kprobe __maybe_unused) 1068 { 1069 return -ENOSYS; 1070 } 1071 1072 static int try_to_find_probe_trace_events(struct perf_probe_event *pev, 1073 struct probe_trace_event **tevs __maybe_unused) 1074 { 1075 if (perf_probe_event_need_dwarf(pev)) { 1076 pr_warning("Debuginfo-analysis is not supported.\n"); 1077 return -ENOSYS; 1078 } 1079 1080 return 0; 1081 } 1082 1083 int show_line_range(struct line_range *lr __maybe_unused, 1084 const char *module __maybe_unused, 1085 bool user __maybe_unused) 1086 { 1087 pr_warning("Debuginfo-analysis is not supported.\n"); 1088 return -ENOSYS; 1089 } 1090 1091 int show_available_vars(struct perf_probe_event *pevs __maybe_unused, 1092 int npevs __maybe_unused, 1093 struct strfilter *filter __maybe_unused) 1094 { 1095 pr_warning("Debuginfo-analysis is not supported.\n"); 1096 return -ENOSYS; 1097 } 1098 #endif 1099 1100 void line_range__clear(struct line_range *lr) 1101 { 1102 free(lr->function); 1103 free(lr->file); 1104 free(lr->path); 1105 free(lr->comp_dir); 1106 intlist__delete(lr->line_list); 1107 memset(lr, 0, sizeof(*lr)); 1108 } 1109 1110 int line_range__init(struct line_range *lr) 1111 { 1112 memset(lr, 0, sizeof(*lr)); 1113 lr->line_list = intlist__new(NULL); 1114 if (!lr->line_list) 1115 return -ENOMEM; 1116 else 1117 return 0; 1118 } 1119 1120 static int parse_line_num(char **ptr, int *val, const char *what) 1121 { 1122 const char *start = *ptr; 1123 1124 errno = 0; 1125 *val = strtol(*ptr, ptr, 0); 1126 if (errno || *ptr == start) { 1127 semantic_error("'%s' is not a valid number.\n", what); 1128 return -EINVAL; 1129 } 1130 return 0; 1131 } 1132 1133 /* Check the name is good for event, group or function */ 1134 static bool is_c_func_name(const char *name) 1135 { 1136 if (!isalpha(*name) && *name != '_') 1137 return false; 1138 while (*++name != '\0') { 1139 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1140 return false; 1141 } 1142 return true; 1143 } 1144 1145 /* 1146 * Stuff 'lr' according to the line range described by 'arg'. 1147 * The line range syntax is described by: 1148 * 1149 * SRC[:SLN[+NUM|-ELN]] 1150 * FNC[@SRC][:SLN[+NUM|-ELN]] 1151 */ 1152 int parse_line_range_desc(const char *arg, struct line_range *lr) 1153 { 1154 char *range, *file, *name = strdup(arg); 1155 int err; 1156 1157 if (!name) 1158 return -ENOMEM; 1159 1160 lr->start = 0; 1161 lr->end = INT_MAX; 1162 1163 range = strchr(name, ':'); 1164 if (range) { 1165 *range++ = '\0'; 1166 1167 err = parse_line_num(&range, &lr->start, "start line"); 1168 if (err) 1169 goto err; 1170 1171 if (*range == '+' || *range == '-') { 1172 const char c = *range++; 1173 1174 err = parse_line_num(&range, &lr->end, "end line"); 1175 if (err) 1176 goto err; 1177 1178 if (c == '+') { 1179 lr->end += lr->start; 1180 /* 1181 * Adjust the number of lines here. 1182 * If the number of lines == 1, the 1183 * the end of line should be equal to 1184 * the start of line. 1185 */ 1186 lr->end--; 1187 } 1188 } 1189 1190 pr_debug("Line range is %d to %d\n", lr->start, lr->end); 1191 1192 err = -EINVAL; 1193 if (lr->start > lr->end) { 1194 semantic_error("Start line must be smaller" 1195 " than end line.\n"); 1196 goto err; 1197 } 1198 if (*range != '\0') { 1199 semantic_error("Tailing with invalid str '%s'.\n", range); 1200 goto err; 1201 } 1202 } 1203 1204 file = strchr(name, '@'); 1205 if (file) { 1206 *file = '\0'; 1207 lr->file = strdup(++file); 1208 if (lr->file == NULL) { 1209 err = -ENOMEM; 1210 goto err; 1211 } 1212 lr->function = name; 1213 } else if (strchr(name, '/') || strchr(name, '.')) 1214 lr->file = name; 1215 else if (is_c_func_name(name))/* We reuse it for checking funcname */ 1216 lr->function = name; 1217 else { /* Invalid name */ 1218 semantic_error("'%s' is not a valid function name.\n", name); 1219 err = -EINVAL; 1220 goto err; 1221 } 1222 1223 return 0; 1224 err: 1225 free(name); 1226 return err; 1227 } 1228 1229 static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) 1230 { 1231 char *ptr; 1232 1233 ptr = strchr(*arg, ':'); 1234 if (ptr) { 1235 *ptr = '\0'; 1236 if (!pev->sdt && !is_c_func_name(*arg)) 1237 goto ng_name; 1238 pev->group = strdup(*arg); 1239 if (!pev->group) 1240 return -ENOMEM; 1241 *arg = ptr + 1; 1242 } else 1243 pev->group = NULL; 1244 if (!pev->sdt && !is_c_func_name(*arg)) { 1245 ng_name: 1246 semantic_error("%s is bad for event name -it must " 1247 "follow C symbol-naming rule.\n", *arg); 1248 return -EINVAL; 1249 } 1250 pev->event = strdup(*arg); 1251 if (pev->event == NULL) 1252 return -ENOMEM; 1253 1254 return 0; 1255 } 1256 1257 /* Parse probepoint definition. */ 1258 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) 1259 { 1260 struct perf_probe_point *pp = &pev->point; 1261 char *ptr, *tmp; 1262 char c, nc = 0; 1263 bool file_spec = false; 1264 int ret; 1265 1266 /* 1267 * <Syntax> 1268 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] 1269 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] 1270 * perf probe %[GRP:]SDT_EVENT 1271 */ 1272 if (!arg) 1273 return -EINVAL; 1274 1275 /* 1276 * If the probe point starts with '%', 1277 * or starts with "sdt_" and has a ':' but no '=', 1278 * then it should be a SDT/cached probe point. 1279 */ 1280 if (arg[0] == '%' || 1281 (!strncmp(arg, "sdt_", 4) && 1282 !!strchr(arg, ':') && !strchr(arg, '='))) { 1283 pev->sdt = true; 1284 if (arg[0] == '%') 1285 arg++; 1286 } 1287 1288 ptr = strpbrk(arg, ";=@+%"); 1289 if (pev->sdt) { 1290 if (ptr) { 1291 if (*ptr != '@') { 1292 semantic_error("%s must be an SDT name.\n", 1293 arg); 1294 return -EINVAL; 1295 } 1296 /* This must be a target file name or build id */ 1297 tmp = build_id_cache__complement(ptr + 1); 1298 if (tmp) { 1299 pev->target = build_id_cache__origname(tmp); 1300 free(tmp); 1301 } else 1302 pev->target = strdup(ptr + 1); 1303 if (!pev->target) 1304 return -ENOMEM; 1305 *ptr = '\0'; 1306 } 1307 ret = parse_perf_probe_event_name(&arg, pev); 1308 if (ret == 0) { 1309 if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) 1310 ret = -errno; 1311 } 1312 return ret; 1313 } 1314 1315 if (ptr && *ptr == '=') { /* Event name */ 1316 *ptr = '\0'; 1317 tmp = ptr + 1; 1318 ret = parse_perf_probe_event_name(&arg, pev); 1319 if (ret < 0) 1320 return ret; 1321 1322 arg = tmp; 1323 } 1324 1325 /* 1326 * Check arg is function or file name and copy it. 1327 * 1328 * We consider arg to be a file spec if and only if it satisfies 1329 * all of the below criteria:: 1330 * - it does not include any of "+@%", 1331 * - it includes one of ":;", and 1332 * - it has a period '.' in the name. 1333 * 1334 * Otherwise, we consider arg to be a function specification. 1335 */ 1336 if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) { 1337 /* This is a file spec if it includes a '.' before ; or : */ 1338 if (memchr(arg, '.', ptr - arg)) 1339 file_spec = true; 1340 } 1341 1342 ptr = strpbrk(arg, ";:+@%"); 1343 if (ptr) { 1344 nc = *ptr; 1345 *ptr++ = '\0'; 1346 } 1347 1348 if (arg[0] == '\0') 1349 tmp = NULL; 1350 else { 1351 tmp = strdup(arg); 1352 if (tmp == NULL) 1353 return -ENOMEM; 1354 } 1355 1356 if (file_spec) 1357 pp->file = tmp; 1358 else { 1359 pp->function = tmp; 1360 1361 /* 1362 * Keep pp->function even if this is absolute address, 1363 * so it can mark whether abs_address is valid. 1364 * Which make 'perf probe lib.bin 0x0' possible. 1365 * 1366 * Note that checking length of tmp is not needed 1367 * because when we access tmp[1] we know tmp[0] is '0', 1368 * so tmp[1] should always valid (but could be '\0'). 1369 */ 1370 if (tmp && !strncmp(tmp, "0x", 2)) { 1371 pp->abs_address = strtoul(pp->function, &tmp, 0); 1372 if (*tmp != '\0') { 1373 semantic_error("Invalid absolute address.\n"); 1374 return -EINVAL; 1375 } 1376 } 1377 } 1378 1379 /* Parse other options */ 1380 while (ptr) { 1381 arg = ptr; 1382 c = nc; 1383 if (c == ';') { /* Lazy pattern must be the last part */ 1384 pp->lazy_line = strdup(arg); 1385 if (pp->lazy_line == NULL) 1386 return -ENOMEM; 1387 break; 1388 } 1389 ptr = strpbrk(arg, ";:+@%"); 1390 if (ptr) { 1391 nc = *ptr; 1392 *ptr++ = '\0'; 1393 } 1394 switch (c) { 1395 case ':': /* Line number */ 1396 pp->line = strtoul(arg, &tmp, 0); 1397 if (*tmp != '\0') { 1398 semantic_error("There is non-digit char" 1399 " in line number.\n"); 1400 return -EINVAL; 1401 } 1402 break; 1403 case '+': /* Byte offset from a symbol */ 1404 pp->offset = strtoul(arg, &tmp, 0); 1405 if (*tmp != '\0') { 1406 semantic_error("There is non-digit character" 1407 " in offset.\n"); 1408 return -EINVAL; 1409 } 1410 break; 1411 case '@': /* File name */ 1412 if (pp->file) { 1413 semantic_error("SRC@SRC is not allowed.\n"); 1414 return -EINVAL; 1415 } 1416 pp->file = strdup(arg); 1417 if (pp->file == NULL) 1418 return -ENOMEM; 1419 break; 1420 case '%': /* Probe places */ 1421 if (strcmp(arg, "return") == 0) { 1422 pp->retprobe = 1; 1423 } else { /* Others not supported yet */ 1424 semantic_error("%%%s is not supported.\n", arg); 1425 return -ENOTSUP; 1426 } 1427 break; 1428 default: /* Buggy case */ 1429 pr_err("This program has a bug at %s:%d.\n", 1430 __FILE__, __LINE__); 1431 return -ENOTSUP; 1432 break; 1433 } 1434 } 1435 1436 /* Exclusion check */ 1437 if (pp->lazy_line && pp->line) { 1438 semantic_error("Lazy pattern can't be used with" 1439 " line number.\n"); 1440 return -EINVAL; 1441 } 1442 1443 if (pp->lazy_line && pp->offset) { 1444 semantic_error("Lazy pattern can't be used with offset.\n"); 1445 return -EINVAL; 1446 } 1447 1448 if (pp->line && pp->offset) { 1449 semantic_error("Offset can't be used with line number.\n"); 1450 return -EINVAL; 1451 } 1452 1453 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { 1454 semantic_error("File always requires line number or " 1455 "lazy pattern.\n"); 1456 return -EINVAL; 1457 } 1458 1459 if (pp->offset && !pp->function) { 1460 semantic_error("Offset requires an entry function.\n"); 1461 return -EINVAL; 1462 } 1463 1464 if (pp->retprobe && !pp->function) { 1465 semantic_error("Return probe requires an entry function.\n"); 1466 return -EINVAL; 1467 } 1468 1469 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { 1470 semantic_error("Offset/Line/Lazy pattern can't be used with " 1471 "return probe.\n"); 1472 return -EINVAL; 1473 } 1474 1475 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", 1476 pp->function, pp->file, pp->line, pp->offset, pp->retprobe, 1477 pp->lazy_line); 1478 return 0; 1479 } 1480 1481 /* Parse perf-probe event argument */ 1482 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) 1483 { 1484 char *tmp, *goodname; 1485 struct perf_probe_arg_field **fieldp; 1486 1487 pr_debug("parsing arg: %s into ", str); 1488 1489 tmp = strchr(str, '='); 1490 if (tmp) { 1491 arg->name = strndup(str, tmp - str); 1492 if (arg->name == NULL) 1493 return -ENOMEM; 1494 pr_debug("name:%s ", arg->name); 1495 str = tmp + 1; 1496 } 1497 1498 tmp = strchr(str, ':'); 1499 if (tmp) { /* Type setting */ 1500 *tmp = '\0'; 1501 arg->type = strdup(tmp + 1); 1502 if (arg->type == NULL) 1503 return -ENOMEM; 1504 pr_debug("type:%s ", arg->type); 1505 } 1506 1507 tmp = strpbrk(str, "-.["); 1508 if (!is_c_varname(str) || !tmp) { 1509 /* A variable, register, symbol or special value */ 1510 arg->var = strdup(str); 1511 if (arg->var == NULL) 1512 return -ENOMEM; 1513 pr_debug("%s\n", arg->var); 1514 return 0; 1515 } 1516 1517 /* Structure fields or array element */ 1518 arg->var = strndup(str, tmp - str); 1519 if (arg->var == NULL) 1520 return -ENOMEM; 1521 goodname = arg->var; 1522 pr_debug("%s, ", arg->var); 1523 fieldp = &arg->field; 1524 1525 do { 1526 *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); 1527 if (*fieldp == NULL) 1528 return -ENOMEM; 1529 if (*tmp == '[') { /* Array */ 1530 str = tmp; 1531 (*fieldp)->index = strtol(str + 1, &tmp, 0); 1532 (*fieldp)->ref = true; 1533 if (*tmp != ']' || tmp == str + 1) { 1534 semantic_error("Array index must be a" 1535 " number.\n"); 1536 return -EINVAL; 1537 } 1538 tmp++; 1539 if (*tmp == '\0') 1540 tmp = NULL; 1541 } else { /* Structure */ 1542 if (*tmp == '.') { 1543 str = tmp + 1; 1544 (*fieldp)->ref = false; 1545 } else if (tmp[1] == '>') { 1546 str = tmp + 2; 1547 (*fieldp)->ref = true; 1548 } else { 1549 semantic_error("Argument parse error: %s\n", 1550 str); 1551 return -EINVAL; 1552 } 1553 tmp = strpbrk(str, "-.["); 1554 } 1555 if (tmp) { 1556 (*fieldp)->name = strndup(str, tmp - str); 1557 if ((*fieldp)->name == NULL) 1558 return -ENOMEM; 1559 if (*str != '[') 1560 goodname = (*fieldp)->name; 1561 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); 1562 fieldp = &(*fieldp)->next; 1563 } 1564 } while (tmp); 1565 (*fieldp)->name = strdup(str); 1566 if ((*fieldp)->name == NULL) 1567 return -ENOMEM; 1568 if (*str != '[') 1569 goodname = (*fieldp)->name; 1570 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); 1571 1572 /* If no name is specified, set the last field name (not array index)*/ 1573 if (!arg->name) { 1574 arg->name = strdup(goodname); 1575 if (arg->name == NULL) 1576 return -ENOMEM; 1577 } 1578 return 0; 1579 } 1580 1581 /* Parse perf-probe event command */ 1582 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) 1583 { 1584 char **argv; 1585 int argc, i, ret = 0; 1586 1587 argv = argv_split(cmd, &argc); 1588 if (!argv) { 1589 pr_debug("Failed to split arguments.\n"); 1590 return -ENOMEM; 1591 } 1592 if (argc - 1 > MAX_PROBE_ARGS) { 1593 semantic_error("Too many probe arguments (%d).\n", argc - 1); 1594 ret = -ERANGE; 1595 goto out; 1596 } 1597 /* Parse probe point */ 1598 ret = parse_perf_probe_point(argv[0], pev); 1599 if (ret < 0) 1600 goto out; 1601 1602 /* Copy arguments and ensure return probe has no C argument */ 1603 pev->nargs = argc - 1; 1604 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 1605 if (pev->args == NULL) { 1606 ret = -ENOMEM; 1607 goto out; 1608 } 1609 for (i = 0; i < pev->nargs && ret >= 0; i++) { 1610 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); 1611 if (ret >= 0 && 1612 is_c_varname(pev->args[i].var) && pev->point.retprobe) { 1613 semantic_error("You can't specify local variable for" 1614 " kretprobe.\n"); 1615 ret = -EINVAL; 1616 } 1617 } 1618 out: 1619 argv_free(argv); 1620 1621 return ret; 1622 } 1623 1624 /* Returns true if *any* ARG is either C variable, $params or $vars. */ 1625 bool perf_probe_with_var(struct perf_probe_event *pev) 1626 { 1627 int i = 0; 1628 1629 for (i = 0; i < pev->nargs; i++) 1630 if (is_c_varname(pev->args[i].var) || 1631 !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || 1632 !strcmp(pev->args[i].var, PROBE_ARG_VARS)) 1633 return true; 1634 return false; 1635 } 1636 1637 /* Return true if this perf_probe_event requires debuginfo */ 1638 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) 1639 { 1640 if (pev->point.file || pev->point.line || pev->point.lazy_line) 1641 return true; 1642 1643 if (perf_probe_with_var(pev)) 1644 return true; 1645 1646 return false; 1647 } 1648 1649 /* Parse probe_events event into struct probe_point */ 1650 int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) 1651 { 1652 struct probe_trace_point *tp = &tev->point; 1653 char pr; 1654 char *p; 1655 char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; 1656 int ret, i, argc; 1657 char **argv; 1658 1659 pr_debug("Parsing probe_events: %s\n", cmd); 1660 argv = argv_split(cmd, &argc); 1661 if (!argv) { 1662 pr_debug("Failed to split arguments.\n"); 1663 return -ENOMEM; 1664 } 1665 if (argc < 2) { 1666 semantic_error("Too few probe arguments.\n"); 1667 ret = -ERANGE; 1668 goto out; 1669 } 1670 1671 /* Scan event and group name. */ 1672 argv0_str = strdup(argv[0]); 1673 if (argv0_str == NULL) { 1674 ret = -ENOMEM; 1675 goto out; 1676 } 1677 fmt1_str = strtok_r(argv0_str, ":", &fmt); 1678 fmt2_str = strtok_r(NULL, "/", &fmt); 1679 fmt3_str = strtok_r(NULL, " \t", &fmt); 1680 if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL 1681 || fmt3_str == NULL) { 1682 semantic_error("Failed to parse event name: %s\n", argv[0]); 1683 ret = -EINVAL; 1684 goto out; 1685 } 1686 pr = fmt1_str[0]; 1687 tev->group = strdup(fmt2_str); 1688 tev->event = strdup(fmt3_str); 1689 if (tev->group == NULL || tev->event == NULL) { 1690 ret = -ENOMEM; 1691 goto out; 1692 } 1693 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); 1694 1695 tp->retprobe = (pr == 'r'); 1696 1697 /* Scan module name(if there), function name and offset */ 1698 p = strchr(argv[1], ':'); 1699 if (p) { 1700 tp->module = strndup(argv[1], p - argv[1]); 1701 if (!tp->module) { 1702 ret = -ENOMEM; 1703 goto out; 1704 } 1705 tev->uprobes = (tp->module[0] == '/'); 1706 p++; 1707 } else 1708 p = argv[1]; 1709 fmt1_str = strtok_r(p, "+", &fmt); 1710 /* only the address started with 0x */ 1711 if (fmt1_str[0] == '0') { 1712 /* 1713 * Fix a special case: 1714 * if address == 0, kernel reports something like: 1715 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax 1716 * Newer kernel may fix that, but we want to 1717 * support old kernel also. 1718 */ 1719 if (strcmp(fmt1_str, "0x") == 0) { 1720 if (!argv[2] || strcmp(argv[2], "(null)")) { 1721 ret = -EINVAL; 1722 goto out; 1723 } 1724 tp->address = 0; 1725 1726 free(argv[2]); 1727 for (i = 2; argv[i + 1] != NULL; i++) 1728 argv[i] = argv[i + 1]; 1729 1730 argv[i] = NULL; 1731 argc -= 1; 1732 } else 1733 tp->address = strtoul(fmt1_str, NULL, 0); 1734 } else { 1735 /* Only the symbol-based probe has offset */ 1736 tp->symbol = strdup(fmt1_str); 1737 if (tp->symbol == NULL) { 1738 ret = -ENOMEM; 1739 goto out; 1740 } 1741 fmt2_str = strtok_r(NULL, "", &fmt); 1742 if (fmt2_str == NULL) 1743 tp->offset = 0; 1744 else 1745 tp->offset = strtoul(fmt2_str, NULL, 10); 1746 } 1747 1748 tev->nargs = argc - 2; 1749 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 1750 if (tev->args == NULL) { 1751 ret = -ENOMEM; 1752 goto out; 1753 } 1754 for (i = 0; i < tev->nargs; i++) { 1755 p = strchr(argv[i + 2], '='); 1756 if (p) /* We don't need which register is assigned. */ 1757 *p++ = '\0'; 1758 else 1759 p = argv[i + 2]; 1760 tev->args[i].name = strdup(argv[i + 2]); 1761 /* TODO: parse regs and offset */ 1762 tev->args[i].value = strdup(p); 1763 if (tev->args[i].name == NULL || tev->args[i].value == NULL) { 1764 ret = -ENOMEM; 1765 goto out; 1766 } 1767 } 1768 ret = 0; 1769 out: 1770 free(argv0_str); 1771 argv_free(argv); 1772 return ret; 1773 } 1774 1775 /* Compose only probe arg */ 1776 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) 1777 { 1778 struct perf_probe_arg_field *field = pa->field; 1779 struct strbuf buf; 1780 char *ret = NULL; 1781 int err; 1782 1783 if (strbuf_init(&buf, 64) < 0) 1784 return NULL; 1785 1786 if (pa->name && pa->var) 1787 err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); 1788 else 1789 err = strbuf_addstr(&buf, pa->name ?: pa->var); 1790 if (err) 1791 goto out; 1792 1793 while (field) { 1794 if (field->name[0] == '[') 1795 err = strbuf_addstr(&buf, field->name); 1796 else 1797 err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", 1798 field->name); 1799 field = field->next; 1800 if (err) 1801 goto out; 1802 } 1803 1804 if (pa->type) 1805 if (strbuf_addf(&buf, ":%s", pa->type) < 0) 1806 goto out; 1807 1808 ret = strbuf_detach(&buf, NULL); 1809 out: 1810 strbuf_release(&buf); 1811 return ret; 1812 } 1813 1814 /* Compose only probe point (not argument) */ 1815 char *synthesize_perf_probe_point(struct perf_probe_point *pp) 1816 { 1817 struct strbuf buf; 1818 char *tmp, *ret = NULL; 1819 int len, err = 0; 1820 1821 if (strbuf_init(&buf, 64) < 0) 1822 return NULL; 1823 1824 if (pp->function) { 1825 if (strbuf_addstr(&buf, pp->function) < 0) 1826 goto out; 1827 if (pp->offset) 1828 err = strbuf_addf(&buf, "+%lu", pp->offset); 1829 else if (pp->line) 1830 err = strbuf_addf(&buf, ":%d", pp->line); 1831 else if (pp->retprobe) 1832 err = strbuf_addstr(&buf, "%return"); 1833 if (err) 1834 goto out; 1835 } 1836 if (pp->file) { 1837 tmp = pp->file; 1838 len = strlen(tmp); 1839 if (len > 30) { 1840 tmp = strchr(pp->file + len - 30, '/'); 1841 tmp = tmp ? tmp + 1 : pp->file + len - 30; 1842 } 1843 err = strbuf_addf(&buf, "@%s", tmp); 1844 if (!err && !pp->function && pp->line) 1845 err = strbuf_addf(&buf, ":%d", pp->line); 1846 } 1847 if (!err) 1848 ret = strbuf_detach(&buf, NULL); 1849 out: 1850 strbuf_release(&buf); 1851 return ret; 1852 } 1853 1854 char *synthesize_perf_probe_command(struct perf_probe_event *pev) 1855 { 1856 struct strbuf buf; 1857 char *tmp, *ret = NULL; 1858 int i; 1859 1860 if (strbuf_init(&buf, 64)) 1861 return NULL; 1862 if (pev->event) 1863 if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, 1864 pev->event) < 0) 1865 goto out; 1866 1867 tmp = synthesize_perf_probe_point(&pev->point); 1868 if (!tmp || strbuf_addstr(&buf, tmp) < 0) 1869 goto out; 1870 free(tmp); 1871 1872 for (i = 0; i < pev->nargs; i++) { 1873 tmp = synthesize_perf_probe_arg(pev->args + i); 1874 if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) 1875 goto out; 1876 free(tmp); 1877 } 1878 1879 ret = strbuf_detach(&buf, NULL); 1880 out: 1881 strbuf_release(&buf); 1882 return ret; 1883 } 1884 1885 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, 1886 struct strbuf *buf, int depth) 1887 { 1888 int err; 1889 if (ref->next) { 1890 depth = __synthesize_probe_trace_arg_ref(ref->next, buf, 1891 depth + 1); 1892 if (depth < 0) 1893 return depth; 1894 } 1895 err = strbuf_addf(buf, "%+ld(", ref->offset); 1896 return (err < 0) ? err : depth; 1897 } 1898 1899 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, 1900 struct strbuf *buf) 1901 { 1902 struct probe_trace_arg_ref *ref = arg->ref; 1903 int depth = 0, err; 1904 1905 /* Argument name or separator */ 1906 if (arg->name) 1907 err = strbuf_addf(buf, " %s=", arg->name); 1908 else 1909 err = strbuf_addch(buf, ' '); 1910 if (err) 1911 return err; 1912 1913 /* Special case: @XXX */ 1914 if (arg->value[0] == '@' && arg->ref) 1915 ref = ref->next; 1916 1917 /* Dereferencing arguments */ 1918 if (ref) { 1919 depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); 1920 if (depth < 0) 1921 return depth; 1922 } 1923 1924 /* Print argument value */ 1925 if (arg->value[0] == '@' && arg->ref) 1926 err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); 1927 else 1928 err = strbuf_addstr(buf, arg->value); 1929 1930 /* Closing */ 1931 while (!err && depth--) 1932 err = strbuf_addch(buf, ')'); 1933 1934 /* Print argument type */ 1935 if (!err && arg->type) 1936 err = strbuf_addf(buf, ":%s", arg->type); 1937 1938 return err; 1939 } 1940 1941 char *synthesize_probe_trace_command(struct probe_trace_event *tev) 1942 { 1943 struct probe_trace_point *tp = &tev->point; 1944 struct strbuf buf; 1945 char *ret = NULL; 1946 int i, err; 1947 1948 /* Uprobes must have tp->module */ 1949 if (tev->uprobes && !tp->module) 1950 return NULL; 1951 1952 if (strbuf_init(&buf, 32) < 0) 1953 return NULL; 1954 1955 if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', 1956 tev->group, tev->event) < 0) 1957 goto error; 1958 /* 1959 * If tp->address == 0, then this point must be a 1960 * absolute address uprobe. 1961 * try_to_find_absolute_address() should have made 1962 * tp->symbol to "0x0". 1963 */ 1964 if (tev->uprobes && !tp->address) { 1965 if (!tp->symbol || strcmp(tp->symbol, "0x0")) 1966 goto error; 1967 } 1968 1969 /* Use the tp->address for uprobes */ 1970 if (tev->uprobes) 1971 err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address); 1972 else if (!strncmp(tp->symbol, "0x", 2)) 1973 /* Absolute address. See try_to_find_absolute_address() */ 1974 err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", 1975 tp->module ? ":" : "", tp->address); 1976 else 1977 err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", 1978 tp->module ? ":" : "", tp->symbol, tp->offset); 1979 if (err) 1980 goto error; 1981 1982 for (i = 0; i < tev->nargs; i++) 1983 if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) 1984 goto error; 1985 1986 ret = strbuf_detach(&buf, NULL); 1987 error: 1988 strbuf_release(&buf); 1989 return ret; 1990 } 1991 1992 static int find_perf_probe_point_from_map(struct probe_trace_point *tp, 1993 struct perf_probe_point *pp, 1994 bool is_kprobe) 1995 { 1996 struct symbol *sym = NULL; 1997 struct map *map; 1998 u64 addr = tp->address; 1999 int ret = -ENOENT; 2000 2001 if (!is_kprobe) { 2002 map = dso__new_map(tp->module); 2003 if (!map) 2004 goto out; 2005 sym = map__find_symbol(map, addr); 2006 } else { 2007 if (tp->symbol && !addr) { 2008 if (kernel_get_symbol_address_by_name(tp->symbol, 2009 &addr, true, false) < 0) 2010 goto out; 2011 } 2012 if (addr) { 2013 addr += tp->offset; 2014 sym = __find_kernel_function(addr, &map); 2015 } 2016 } 2017 2018 if (!sym) 2019 goto out; 2020 2021 pp->retprobe = tp->retprobe; 2022 pp->offset = addr - map->unmap_ip(map, sym->start); 2023 pp->function = strdup(sym->name); 2024 ret = pp->function ? 0 : -ENOMEM; 2025 2026 out: 2027 if (map && !is_kprobe) { 2028 map__put(map); 2029 } 2030 2031 return ret; 2032 } 2033 2034 static int convert_to_perf_probe_point(struct probe_trace_point *tp, 2035 struct perf_probe_point *pp, 2036 bool is_kprobe) 2037 { 2038 char buf[128]; 2039 int ret; 2040 2041 ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); 2042 if (!ret) 2043 return 0; 2044 ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); 2045 if (!ret) 2046 return 0; 2047 2048 pr_debug("Failed to find probe point from both of dwarf and map.\n"); 2049 2050 if (tp->symbol) { 2051 pp->function = strdup(tp->symbol); 2052 pp->offset = tp->offset; 2053 } else { 2054 ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); 2055 if (ret < 0) 2056 return ret; 2057 pp->function = strdup(buf); 2058 pp->offset = 0; 2059 } 2060 if (pp->function == NULL) 2061 return -ENOMEM; 2062 2063 pp->retprobe = tp->retprobe; 2064 2065 return 0; 2066 } 2067 2068 static int convert_to_perf_probe_event(struct probe_trace_event *tev, 2069 struct perf_probe_event *pev, bool is_kprobe) 2070 { 2071 struct strbuf buf = STRBUF_INIT; 2072 int i, ret; 2073 2074 /* Convert event/group name */ 2075 pev->event = strdup(tev->event); 2076 pev->group = strdup(tev->group); 2077 if (pev->event == NULL || pev->group == NULL) 2078 return -ENOMEM; 2079 2080 /* Convert trace_point to probe_point */ 2081 ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); 2082 if (ret < 0) 2083 return ret; 2084 2085 /* Convert trace_arg to probe_arg */ 2086 pev->nargs = tev->nargs; 2087 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); 2088 if (pev->args == NULL) 2089 return -ENOMEM; 2090 for (i = 0; i < tev->nargs && ret >= 0; i++) { 2091 if (tev->args[i].name) 2092 pev->args[i].name = strdup(tev->args[i].name); 2093 else { 2094 if ((ret = strbuf_init(&buf, 32)) < 0) 2095 goto error; 2096 ret = synthesize_probe_trace_arg(&tev->args[i], &buf); 2097 pev->args[i].name = strbuf_detach(&buf, NULL); 2098 } 2099 if (pev->args[i].name == NULL && ret >= 0) 2100 ret = -ENOMEM; 2101 } 2102 error: 2103 if (ret < 0) 2104 clear_perf_probe_event(pev); 2105 2106 return ret; 2107 } 2108 2109 void clear_perf_probe_event(struct perf_probe_event *pev) 2110 { 2111 struct perf_probe_arg_field *field, *next; 2112 int i; 2113 2114 free(pev->event); 2115 free(pev->group); 2116 free(pev->target); 2117 clear_perf_probe_point(&pev->point); 2118 2119 for (i = 0; i < pev->nargs; i++) { 2120 free(pev->args[i].name); 2121 free(pev->args[i].var); 2122 free(pev->args[i].type); 2123 field = pev->args[i].field; 2124 while (field) { 2125 next = field->next; 2126 zfree(&field->name); 2127 free(field); 2128 field = next; 2129 } 2130 } 2131 free(pev->args); 2132 memset(pev, 0, sizeof(*pev)); 2133 } 2134 2135 #define strdup_or_goto(str, label) \ 2136 ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) 2137 2138 static int perf_probe_point__copy(struct perf_probe_point *dst, 2139 struct perf_probe_point *src) 2140 { 2141 dst->file = strdup_or_goto(src->file, out_err); 2142 dst->function = strdup_or_goto(src->function, out_err); 2143 dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); 2144 dst->line = src->line; 2145 dst->retprobe = src->retprobe; 2146 dst->offset = src->offset; 2147 return 0; 2148 2149 out_err: 2150 clear_perf_probe_point(dst); 2151 return -ENOMEM; 2152 } 2153 2154 static int perf_probe_arg__copy(struct perf_probe_arg *dst, 2155 struct perf_probe_arg *src) 2156 { 2157 struct perf_probe_arg_field *field, **ppfield; 2158 2159 dst->name = strdup_or_goto(src->name, out_err); 2160 dst->var = strdup_or_goto(src->var, out_err); 2161 dst->type = strdup_or_goto(src->type, out_err); 2162 2163 field = src->field; 2164 ppfield = &(dst->field); 2165 while (field) { 2166 *ppfield = zalloc(sizeof(*field)); 2167 if (!*ppfield) 2168 goto out_err; 2169 (*ppfield)->name = strdup_or_goto(field->name, out_err); 2170 (*ppfield)->index = field->index; 2171 (*ppfield)->ref = field->ref; 2172 field = field->next; 2173 ppfield = &((*ppfield)->next); 2174 } 2175 return 0; 2176 out_err: 2177 return -ENOMEM; 2178 } 2179 2180 int perf_probe_event__copy(struct perf_probe_event *dst, 2181 struct perf_probe_event *src) 2182 { 2183 int i; 2184 2185 dst->event = strdup_or_goto(src->event, out_err); 2186 dst->group = strdup_or_goto(src->group, out_err); 2187 dst->target = strdup_or_goto(src->target, out_err); 2188 dst->uprobes = src->uprobes; 2189 2190 if (perf_probe_point__copy(&dst->point, &src->point) < 0) 2191 goto out_err; 2192 2193 dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); 2194 if (!dst->args) 2195 goto out_err; 2196 dst->nargs = src->nargs; 2197 2198 for (i = 0; i < src->nargs; i++) 2199 if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) 2200 goto out_err; 2201 return 0; 2202 2203 out_err: 2204 clear_perf_probe_event(dst); 2205 return -ENOMEM; 2206 } 2207 2208 void clear_probe_trace_event(struct probe_trace_event *tev) 2209 { 2210 struct probe_trace_arg_ref *ref, *next; 2211 int i; 2212 2213 free(tev->event); 2214 free(tev->group); 2215 free(tev->point.symbol); 2216 free(tev->point.realname); 2217 free(tev->point.module); 2218 for (i = 0; i < tev->nargs; i++) { 2219 free(tev->args[i].name); 2220 free(tev->args[i].value); 2221 free(tev->args[i].type); 2222 ref = tev->args[i].ref; 2223 while (ref) { 2224 next = ref->next; 2225 free(ref); 2226 ref = next; 2227 } 2228 } 2229 free(tev->args); 2230 memset(tev, 0, sizeof(*tev)); 2231 } 2232 2233 struct kprobe_blacklist_node { 2234 struct list_head list; 2235 unsigned long start; 2236 unsigned long end; 2237 char *symbol; 2238 }; 2239 2240 static void kprobe_blacklist__delete(struct list_head *blacklist) 2241 { 2242 struct kprobe_blacklist_node *node; 2243 2244 while (!list_empty(blacklist)) { 2245 node = list_first_entry(blacklist, 2246 struct kprobe_blacklist_node, list); 2247 list_del(&node->list); 2248 free(node->symbol); 2249 free(node); 2250 } 2251 } 2252 2253 static int kprobe_blacklist__load(struct list_head *blacklist) 2254 { 2255 struct kprobe_blacklist_node *node; 2256 const char *__debugfs = debugfs__mountpoint(); 2257 char buf[PATH_MAX], *p; 2258 FILE *fp; 2259 int ret; 2260 2261 if (__debugfs == NULL) 2262 return -ENOTSUP; 2263 2264 ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); 2265 if (ret < 0) 2266 return ret; 2267 2268 fp = fopen(buf, "r"); 2269 if (!fp) 2270 return -errno; 2271 2272 ret = 0; 2273 while (fgets(buf, PATH_MAX, fp)) { 2274 node = zalloc(sizeof(*node)); 2275 if (!node) { 2276 ret = -ENOMEM; 2277 break; 2278 } 2279 INIT_LIST_HEAD(&node->list); 2280 list_add_tail(&node->list, blacklist); 2281 if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { 2282 ret = -EINVAL; 2283 break; 2284 } 2285 p = strchr(buf, '\t'); 2286 if (p) { 2287 p++; 2288 if (p[strlen(p) - 1] == '\n') 2289 p[strlen(p) - 1] = '\0'; 2290 } else 2291 p = (char *)"unknown"; 2292 node->symbol = strdup(p); 2293 if (!node->symbol) { 2294 ret = -ENOMEM; 2295 break; 2296 } 2297 pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", 2298 node->start, node->end, node->symbol); 2299 ret++; 2300 } 2301 if (ret < 0) 2302 kprobe_blacklist__delete(blacklist); 2303 fclose(fp); 2304 2305 return ret; 2306 } 2307 2308 static struct kprobe_blacklist_node * 2309 kprobe_blacklist__find_by_address(struct list_head *blacklist, 2310 unsigned long address) 2311 { 2312 struct kprobe_blacklist_node *node; 2313 2314 list_for_each_entry(node, blacklist, list) { 2315 if (node->start <= address && address <= node->end) 2316 return node; 2317 } 2318 2319 return NULL; 2320 } 2321 2322 static LIST_HEAD(kprobe_blacklist); 2323 2324 static void kprobe_blacklist__init(void) 2325 { 2326 if (!list_empty(&kprobe_blacklist)) 2327 return; 2328 2329 if (kprobe_blacklist__load(&kprobe_blacklist) < 0) 2330 pr_debug("No kprobe blacklist support, ignored\n"); 2331 } 2332 2333 static void kprobe_blacklist__release(void) 2334 { 2335 kprobe_blacklist__delete(&kprobe_blacklist); 2336 } 2337 2338 static bool kprobe_blacklist__listed(unsigned long address) 2339 { 2340 return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); 2341 } 2342 2343 static int perf_probe_event__sprintf(const char *group, const char *event, 2344 struct perf_probe_event *pev, 2345 const char *module, 2346 struct strbuf *result) 2347 { 2348 int i, ret; 2349 char *buf; 2350 2351 if (asprintf(&buf, "%s:%s", group, event) < 0) 2352 return -errno; 2353 ret = strbuf_addf(result, " %-20s (on ", buf); 2354 free(buf); 2355 if (ret) 2356 return ret; 2357 2358 /* Synthesize only event probe point */ 2359 buf = synthesize_perf_probe_point(&pev->point); 2360 if (!buf) 2361 return -ENOMEM; 2362 ret = strbuf_addstr(result, buf); 2363 free(buf); 2364 2365 if (!ret && module) 2366 ret = strbuf_addf(result, " in %s", module); 2367 2368 if (!ret && pev->nargs > 0) { 2369 ret = strbuf_add(result, " with", 5); 2370 for (i = 0; !ret && i < pev->nargs; i++) { 2371 buf = synthesize_perf_probe_arg(&pev->args[i]); 2372 if (!buf) 2373 return -ENOMEM; 2374 ret = strbuf_addf(result, " %s", buf); 2375 free(buf); 2376 } 2377 } 2378 if (!ret) 2379 ret = strbuf_addch(result, ')'); 2380 2381 return ret; 2382 } 2383 2384 /* Show an event */ 2385 int show_perf_probe_event(const char *group, const char *event, 2386 struct perf_probe_event *pev, 2387 const char *module, bool use_stdout) 2388 { 2389 struct strbuf buf = STRBUF_INIT; 2390 int ret; 2391 2392 ret = perf_probe_event__sprintf(group, event, pev, module, &buf); 2393 if (ret >= 0) { 2394 if (use_stdout) 2395 printf("%s\n", buf.buf); 2396 else 2397 pr_info("%s\n", buf.buf); 2398 } 2399 strbuf_release(&buf); 2400 2401 return ret; 2402 } 2403 2404 static bool filter_probe_trace_event(struct probe_trace_event *tev, 2405 struct strfilter *filter) 2406 { 2407 char tmp[128]; 2408 2409 /* At first, check the event name itself */ 2410 if (strfilter__compare(filter, tev->event)) 2411 return true; 2412 2413 /* Next, check the combination of name and group */ 2414 if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) 2415 return false; 2416 return strfilter__compare(filter, tmp); 2417 } 2418 2419 static int __show_perf_probe_events(int fd, bool is_kprobe, 2420 struct strfilter *filter) 2421 { 2422 int ret = 0; 2423 struct probe_trace_event tev; 2424 struct perf_probe_event pev; 2425 struct strlist *rawlist; 2426 struct str_node *ent; 2427 2428 memset(&tev, 0, sizeof(tev)); 2429 memset(&pev, 0, sizeof(pev)); 2430 2431 rawlist = probe_file__get_rawlist(fd); 2432 if (!rawlist) 2433 return -ENOMEM; 2434 2435 strlist__for_each_entry(ent, rawlist) { 2436 ret = parse_probe_trace_command(ent->s, &tev); 2437 if (ret >= 0) { 2438 if (!filter_probe_trace_event(&tev, filter)) 2439 goto next; 2440 ret = convert_to_perf_probe_event(&tev, &pev, 2441 is_kprobe); 2442 if (ret < 0) 2443 goto next; 2444 ret = show_perf_probe_event(pev.group, pev.event, 2445 &pev, tev.point.module, 2446 true); 2447 } 2448 next: 2449 clear_perf_probe_event(&pev); 2450 clear_probe_trace_event(&tev); 2451 if (ret < 0) 2452 break; 2453 } 2454 strlist__delete(rawlist); 2455 /* Cleanup cached debuginfo if needed */ 2456 debuginfo_cache__exit(); 2457 2458 return ret; 2459 } 2460 2461 /* List up current perf-probe events */ 2462 int show_perf_probe_events(struct strfilter *filter) 2463 { 2464 int kp_fd, up_fd, ret; 2465 2466 setup_pager(); 2467 2468 if (probe_conf.cache) 2469 return probe_cache__show_all_caches(filter); 2470 2471 ret = init_probe_symbol_maps(false); 2472 if (ret < 0) 2473 return ret; 2474 2475 ret = probe_file__open_both(&kp_fd, &up_fd, 0); 2476 if (ret < 0) 2477 return ret; 2478 2479 if (kp_fd >= 0) 2480 ret = __show_perf_probe_events(kp_fd, true, filter); 2481 if (up_fd >= 0 && ret >= 0) 2482 ret = __show_perf_probe_events(up_fd, false, filter); 2483 if (kp_fd > 0) 2484 close(kp_fd); 2485 if (up_fd > 0) 2486 close(up_fd); 2487 exit_probe_symbol_maps(); 2488 2489 return ret; 2490 } 2491 2492 static int get_new_event_name(char *buf, size_t len, const char *base, 2493 struct strlist *namelist, bool allow_suffix) 2494 { 2495 int i, ret; 2496 char *p, *nbase; 2497 2498 if (*base == '.') 2499 base++; 2500 nbase = strdup(base); 2501 if (!nbase) 2502 return -ENOMEM; 2503 2504 /* Cut off the dot suffixes (e.g. .const, .isra)*/ 2505 p = strchr(nbase, '.'); 2506 if (p && p != nbase) 2507 *p = '\0'; 2508 2509 /* Try no suffix number */ 2510 ret = e_snprintf(buf, len, "%s", nbase); 2511 if (ret < 0) { 2512 pr_debug("snprintf() failed: %d\n", ret); 2513 goto out; 2514 } 2515 if (!strlist__has_entry(namelist, buf)) 2516 goto out; 2517 2518 if (!allow_suffix) { 2519 pr_warning("Error: event \"%s\" already exists.\n" 2520 " Hint: Remove existing event by 'perf probe -d'\n" 2521 " or force duplicates by 'perf probe -f'\n" 2522 " or set 'force=yes' in BPF source.\n", 2523 buf); 2524 ret = -EEXIST; 2525 goto out; 2526 } 2527 2528 /* Try to add suffix */ 2529 for (i = 1; i < MAX_EVENT_INDEX; i++) { 2530 ret = e_snprintf(buf, len, "%s_%d", nbase, i); 2531 if (ret < 0) { 2532 pr_debug("snprintf() failed: %d\n", ret); 2533 goto out; 2534 } 2535 if (!strlist__has_entry(namelist, buf)) 2536 break; 2537 } 2538 if (i == MAX_EVENT_INDEX) { 2539 pr_warning("Too many events are on the same function.\n"); 2540 ret = -ERANGE; 2541 } 2542 2543 out: 2544 free(nbase); 2545 return ret; 2546 } 2547 2548 /* Warn if the current kernel's uprobe implementation is old */ 2549 static void warn_uprobe_event_compat(struct probe_trace_event *tev) 2550 { 2551 int i; 2552 char *buf = synthesize_probe_trace_command(tev); 2553 2554 /* Old uprobe event doesn't support memory dereference */ 2555 if (!tev->uprobes || tev->nargs == 0 || !buf) 2556 goto out; 2557 2558 for (i = 0; i < tev->nargs; i++) 2559 if (strglobmatch(tev->args[i].value, "[$@+-]*")) { 2560 pr_warning("Please upgrade your kernel to at least " 2561 "3.14 to have access to feature %s\n", 2562 tev->args[i].value); 2563 break; 2564 } 2565 out: 2566 free(buf); 2567 } 2568 2569 /* Set new name from original perf_probe_event and namelist */ 2570 static int probe_trace_event__set_name(struct probe_trace_event *tev, 2571 struct perf_probe_event *pev, 2572 struct strlist *namelist, 2573 bool allow_suffix) 2574 { 2575 const char *event, *group; 2576 char buf[64]; 2577 int ret; 2578 2579 /* If probe_event or trace_event already have the name, reuse it */ 2580 if (pev->event && !pev->sdt) 2581 event = pev->event; 2582 else if (tev->event) 2583 event = tev->event; 2584 else { 2585 /* Or generate new one from probe point */ 2586 if (pev->point.function && 2587 (strncmp(pev->point.function, "0x", 2) != 0) && 2588 !strisglob(pev->point.function)) 2589 event = pev->point.function; 2590 else 2591 event = tev->point.realname; 2592 } 2593 if (pev->group && !pev->sdt) 2594 group = pev->group; 2595 else if (tev->group) 2596 group = tev->group; 2597 else 2598 group = PERFPROBE_GROUP; 2599 2600 /* Get an unused new event name */ 2601 ret = get_new_event_name(buf, 64, event, 2602 namelist, allow_suffix); 2603 if (ret < 0) 2604 return ret; 2605 2606 event = buf; 2607 2608 tev->event = strdup(event); 2609 tev->group = strdup(group); 2610 if (tev->event == NULL || tev->group == NULL) 2611 return -ENOMEM; 2612 2613 /* Add added event name to namelist */ 2614 strlist__add(namelist, event); 2615 return 0; 2616 } 2617 2618 static int __open_probe_file_and_namelist(bool uprobe, 2619 struct strlist **namelist) 2620 { 2621 int fd; 2622 2623 fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); 2624 if (fd < 0) 2625 return fd; 2626 2627 /* Get current event names */ 2628 *namelist = probe_file__get_namelist(fd); 2629 if (!(*namelist)) { 2630 pr_debug("Failed to get current event list.\n"); 2631 close(fd); 2632 return -ENOMEM; 2633 } 2634 return fd; 2635 } 2636 2637 static int __add_probe_trace_events(struct perf_probe_event *pev, 2638 struct probe_trace_event *tevs, 2639 int ntevs, bool allow_suffix) 2640 { 2641 int i, fd[2] = {-1, -1}, up, ret; 2642 struct probe_trace_event *tev = NULL; 2643 struct probe_cache *cache = NULL; 2644 struct strlist *namelist[2] = {NULL, NULL}; 2645 2646 up = pev->uprobes ? 1 : 0; 2647 fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); 2648 if (fd[up] < 0) 2649 return fd[up]; 2650 2651 ret = 0; 2652 for (i = 0; i < ntevs; i++) { 2653 tev = &tevs[i]; 2654 up = tev->uprobes ? 1 : 0; 2655 if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ 2656 fd[up] = __open_probe_file_and_namelist(up, 2657 &namelist[up]); 2658 if (fd[up] < 0) 2659 goto close_out; 2660 } 2661 /* Skip if the symbol is out of .text or blacklisted */ 2662 if (!tev->point.symbol && !pev->uprobes) 2663 continue; 2664 2665 /* Set new name for tev (and update namelist) */ 2666 ret = probe_trace_event__set_name(tev, pev, namelist[up], 2667 allow_suffix); 2668 if (ret < 0) 2669 break; 2670 2671 ret = probe_file__add_event(fd[up], tev); 2672 if (ret < 0) 2673 break; 2674 2675 /* 2676 * Probes after the first probe which comes from same 2677 * user input are always allowed to add suffix, because 2678 * there might be several addresses corresponding to 2679 * one code line. 2680 */ 2681 allow_suffix = true; 2682 } 2683 if (ret == -EINVAL && pev->uprobes) 2684 warn_uprobe_event_compat(tev); 2685 if (ret == 0 && probe_conf.cache) { 2686 cache = probe_cache__new(pev->target); 2687 if (!cache || 2688 probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || 2689 probe_cache__commit(cache) < 0) 2690 pr_warning("Failed to add event to probe cache\n"); 2691 probe_cache__delete(cache); 2692 } 2693 2694 close_out: 2695 for (up = 0; up < 2; up++) { 2696 strlist__delete(namelist[up]); 2697 if (fd[up] >= 0) 2698 close(fd[up]); 2699 } 2700 return ret; 2701 } 2702 2703 static int find_probe_functions(struct map *map, char *name, 2704 struct symbol **syms) 2705 { 2706 int found = 0; 2707 struct symbol *sym; 2708 struct rb_node *tmp; 2709 2710 if (map__load(map) < 0) 2711 return 0; 2712 2713 map__for_each_symbol(map, sym, tmp) { 2714 if (strglobmatch(sym->name, name)) { 2715 found++; 2716 if (syms && found < probe_conf.max_probes) 2717 syms[found - 1] = sym; 2718 } 2719 } 2720 2721 return found; 2722 } 2723 2724 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, 2725 struct probe_trace_event *tev __maybe_unused, 2726 struct map *map __maybe_unused, 2727 struct symbol *sym __maybe_unused) { } 2728 2729 /* 2730 * Find probe function addresses from map. 2731 * Return an error or the number of found probe_trace_event 2732 */ 2733 static int find_probe_trace_events_from_map(struct perf_probe_event *pev, 2734 struct probe_trace_event **tevs) 2735 { 2736 struct map *map = NULL; 2737 struct ref_reloc_sym *reloc_sym = NULL; 2738 struct symbol *sym; 2739 struct symbol **syms = NULL; 2740 struct probe_trace_event *tev; 2741 struct perf_probe_point *pp = &pev->point; 2742 struct probe_trace_point *tp; 2743 int num_matched_functions; 2744 int ret, i, j, skipped = 0; 2745 char *mod_name; 2746 2747 map = get_target_map(pev->target, pev->uprobes); 2748 if (!map) { 2749 ret = -EINVAL; 2750 goto out; 2751 } 2752 2753 syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); 2754 if (!syms) { 2755 ret = -ENOMEM; 2756 goto out; 2757 } 2758 2759 /* 2760 * Load matched symbols: Since the different local symbols may have 2761 * same name but different addresses, this lists all the symbols. 2762 */ 2763 num_matched_functions = find_probe_functions(map, pp->function, syms); 2764 if (num_matched_functions == 0) { 2765 pr_err("Failed to find symbol %s in %s\n", pp->function, 2766 pev->target ? : "kernel"); 2767 ret = -ENOENT; 2768 goto out; 2769 } else if (num_matched_functions > probe_conf.max_probes) { 2770 pr_err("Too many functions matched in %s\n", 2771 pev->target ? : "kernel"); 2772 ret = -E2BIG; 2773 goto out; 2774 } 2775 2776 /* Note that the symbols in the kmodule are not relocated */ 2777 if (!pev->uprobes && !pp->retprobe && !pev->target) { 2778 reloc_sym = kernel_get_ref_reloc_sym(); 2779 if (!reloc_sym) { 2780 pr_warning("Relocated base symbol is not found!\n"); 2781 ret = -EINVAL; 2782 goto out; 2783 } 2784 } 2785 2786 /* Setup result trace-probe-events */ 2787 *tevs = zalloc(sizeof(*tev) * num_matched_functions); 2788 if (!*tevs) { 2789 ret = -ENOMEM; 2790 goto out; 2791 } 2792 2793 ret = 0; 2794 2795 for (j = 0; j < num_matched_functions; j++) { 2796 sym = syms[j]; 2797 2798 tev = (*tevs) + ret; 2799 tp = &tev->point; 2800 if (ret == num_matched_functions) { 2801 pr_warning("Too many symbols are listed. Skip it.\n"); 2802 break; 2803 } 2804 ret++; 2805 2806 if (pp->offset > sym->end - sym->start) { 2807 pr_warning("Offset %ld is bigger than the size of %s\n", 2808 pp->offset, sym->name); 2809 ret = -ENOENT; 2810 goto err_out; 2811 } 2812 /* Add one probe point */ 2813 tp->address = map->unmap_ip(map, sym->start) + pp->offset; 2814 2815 /* Check the kprobe (not in module) is within .text */ 2816 if (!pev->uprobes && !pev->target && 2817 kprobe_warn_out_range(sym->name, tp->address)) { 2818 tp->symbol = NULL; /* Skip it */ 2819 skipped++; 2820 } else if (reloc_sym) { 2821 tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); 2822 tp->offset = tp->address - reloc_sym->addr; 2823 } else { 2824 tp->symbol = strdup_or_goto(sym->name, nomem_out); 2825 tp->offset = pp->offset; 2826 } 2827 tp->realname = strdup_or_goto(sym->name, nomem_out); 2828 2829 tp->retprobe = pp->retprobe; 2830 if (pev->target) { 2831 if (pev->uprobes) { 2832 tev->point.module = strdup_or_goto(pev->target, 2833 nomem_out); 2834 } else { 2835 mod_name = find_module_name(pev->target); 2836 tev->point.module = 2837 strdup(mod_name ? mod_name : pev->target); 2838 free(mod_name); 2839 if (!tev->point.module) 2840 goto nomem_out; 2841 } 2842 } 2843 tev->uprobes = pev->uprobes; 2844 tev->nargs = pev->nargs; 2845 if (tev->nargs) { 2846 tev->args = zalloc(sizeof(struct probe_trace_arg) * 2847 tev->nargs); 2848 if (tev->args == NULL) 2849 goto nomem_out; 2850 } 2851 for (i = 0; i < tev->nargs; i++) { 2852 if (pev->args[i].name) 2853 tev->args[i].name = 2854 strdup_or_goto(pev->args[i].name, 2855 nomem_out); 2856 2857 tev->args[i].value = strdup_or_goto(pev->args[i].var, 2858 nomem_out); 2859 if (pev->args[i].type) 2860 tev->args[i].type = 2861 strdup_or_goto(pev->args[i].type, 2862 nomem_out); 2863 } 2864 arch__fix_tev_from_maps(pev, tev, map, sym); 2865 } 2866 if (ret == skipped) { 2867 ret = -ENOENT; 2868 goto err_out; 2869 } 2870 2871 out: 2872 put_target_map(map, pev->uprobes); 2873 free(syms); 2874 return ret; 2875 2876 nomem_out: 2877 ret = -ENOMEM; 2878 err_out: 2879 clear_probe_trace_events(*tevs, num_matched_functions); 2880 zfree(tevs); 2881 goto out; 2882 } 2883 2884 static int try_to_find_absolute_address(struct perf_probe_event *pev, 2885 struct probe_trace_event **tevs) 2886 { 2887 struct perf_probe_point *pp = &pev->point; 2888 struct probe_trace_event *tev; 2889 struct probe_trace_point *tp; 2890 int i, err; 2891 2892 if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) 2893 return -EINVAL; 2894 if (perf_probe_event_need_dwarf(pev)) 2895 return -EINVAL; 2896 2897 /* 2898 * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at 2899 * absolute address. 2900 * 2901 * Only one tev can be generated by this. 2902 */ 2903 *tevs = zalloc(sizeof(*tev)); 2904 if (!*tevs) 2905 return -ENOMEM; 2906 2907 tev = *tevs; 2908 tp = &tev->point; 2909 2910 /* 2911 * Don't use tp->offset, use address directly, because 2912 * in synthesize_probe_trace_command() address cannot be 2913 * zero. 2914 */ 2915 tp->address = pev->point.abs_address; 2916 tp->retprobe = pp->retprobe; 2917 tev->uprobes = pev->uprobes; 2918 2919 err = -ENOMEM; 2920 /* 2921 * Give it a '0x' leading symbol name. 2922 * In __add_probe_trace_events, a NULL symbol is interpreted as 2923 * invalud. 2924 */ 2925 if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) 2926 goto errout; 2927 2928 /* For kprobe, check range */ 2929 if ((!tev->uprobes) && 2930 (kprobe_warn_out_range(tev->point.symbol, 2931 tev->point.address))) { 2932 err = -EACCES; 2933 goto errout; 2934 } 2935 2936 if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) 2937 goto errout; 2938 2939 if (pev->target) { 2940 tp->module = strdup(pev->target); 2941 if (!tp->module) 2942 goto errout; 2943 } 2944 2945 if (tev->group) { 2946 tev->group = strdup(pev->group); 2947 if (!tev->group) 2948 goto errout; 2949 } 2950 2951 if (pev->event) { 2952 tev->event = strdup(pev->event); 2953 if (!tev->event) 2954 goto errout; 2955 } 2956 2957 tev->nargs = pev->nargs; 2958 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); 2959 if (!tev->args) { 2960 err = -ENOMEM; 2961 goto errout; 2962 } 2963 for (i = 0; i < tev->nargs; i++) 2964 copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); 2965 2966 return 1; 2967 2968 errout: 2969 if (*tevs) { 2970 clear_probe_trace_events(*tevs, 1); 2971 *tevs = NULL; 2972 } 2973 return err; 2974 } 2975 2976 /* Concatinate two arrays */ 2977 static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) 2978 { 2979 void *ret; 2980 2981 ret = malloc(sz_a + sz_b); 2982 if (ret) { 2983 memcpy(ret, a, sz_a); 2984 memcpy(ret + sz_a, b, sz_b); 2985 } 2986 return ret; 2987 } 2988 2989 static int 2990 concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, 2991 struct probe_trace_event **tevs2, int ntevs2) 2992 { 2993 struct probe_trace_event *new_tevs; 2994 int ret = 0; 2995 2996 if (ntevs == 0) { 2997 *tevs = *tevs2; 2998 *ntevs = ntevs2; 2999 *tevs2 = NULL; 3000 return 0; 3001 } 3002 3003 if (*ntevs + ntevs2 > probe_conf.max_probes) 3004 ret = -E2BIG; 3005 else { 3006 /* Concatinate the array of probe_trace_event */ 3007 new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), 3008 *tevs2, ntevs2 * sizeof(**tevs2)); 3009 if (!new_tevs) 3010 ret = -ENOMEM; 3011 else { 3012 free(*tevs); 3013 *tevs = new_tevs; 3014 *ntevs += ntevs2; 3015 } 3016 } 3017 if (ret < 0) 3018 clear_probe_trace_events(*tevs2, ntevs2); 3019 zfree(tevs2); 3020 3021 return ret; 3022 } 3023 3024 /* 3025 * Try to find probe_trace_event from given probe caches. Return the number 3026 * of cached events found, if an error occurs return the error. 3027 */ 3028 static int find_cached_events(struct perf_probe_event *pev, 3029 struct probe_trace_event **tevs, 3030 const char *target) 3031 { 3032 struct probe_cache *cache; 3033 struct probe_cache_entry *entry; 3034 struct probe_trace_event *tmp_tevs = NULL; 3035 int ntevs = 0; 3036 int ret = 0; 3037 3038 cache = probe_cache__new(target); 3039 /* Return 0 ("not found") if the target has no probe cache. */ 3040 if (!cache) 3041 return 0; 3042 3043 for_each_probe_cache_entry(entry, cache) { 3044 /* Skip the cache entry which has no name */ 3045 if (!entry->pev.event || !entry->pev.group) 3046 continue; 3047 if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && 3048 strglobmatch(entry->pev.event, pev->event)) { 3049 ret = probe_cache_entry__get_event(entry, &tmp_tevs); 3050 if (ret > 0) 3051 ret = concat_probe_trace_events(tevs, &ntevs, 3052 &tmp_tevs, ret); 3053 if (ret < 0) 3054 break; 3055 } 3056 } 3057 probe_cache__delete(cache); 3058 if (ret < 0) { 3059 clear_probe_trace_events(*tevs, ntevs); 3060 zfree(tevs); 3061 } else { 3062 ret = ntevs; 3063 if (ntevs > 0 && target && target[0] == '/') 3064 pev->uprobes = true; 3065 } 3066 3067 return ret; 3068 } 3069 3070 /* Try to find probe_trace_event from all probe caches */ 3071 static int find_cached_events_all(struct perf_probe_event *pev, 3072 struct probe_trace_event **tevs) 3073 { 3074 struct probe_trace_event *tmp_tevs = NULL; 3075 struct strlist *bidlist; 3076 struct str_node *nd; 3077 char *pathname; 3078 int ntevs = 0; 3079 int ret; 3080 3081 /* Get the buildid list of all valid caches */ 3082 bidlist = build_id_cache__list_all(true); 3083 if (!bidlist) { 3084 ret = -errno; 3085 pr_debug("Failed to get buildids: %d\n", ret); 3086 return ret; 3087 } 3088 3089 ret = 0; 3090 strlist__for_each_entry(nd, bidlist) { 3091 pathname = build_id_cache__origname(nd->s); 3092 ret = find_cached_events(pev, &tmp_tevs, pathname); 3093 /* In the case of cnt == 0, we just skip it */ 3094 if (ret > 0) 3095 ret = concat_probe_trace_events(tevs, &ntevs, 3096 &tmp_tevs, ret); 3097 free(pathname); 3098 if (ret < 0) 3099 break; 3100 } 3101 strlist__delete(bidlist); 3102 3103 if (ret < 0) { 3104 clear_probe_trace_events(*tevs, ntevs); 3105 zfree(tevs); 3106 } else 3107 ret = ntevs; 3108 3109 return ret; 3110 } 3111 3112 static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, 3113 struct probe_trace_event **tevs) 3114 { 3115 struct probe_cache *cache; 3116 struct probe_cache_entry *entry; 3117 struct probe_trace_event *tev; 3118 struct str_node *node; 3119 int ret, i; 3120 3121 if (pev->sdt) { 3122 /* For SDT/cached events, we use special search functions */ 3123 if (!pev->target) 3124 return find_cached_events_all(pev, tevs); 3125 else 3126 return find_cached_events(pev, tevs, pev->target); 3127 } 3128 cache = probe_cache__new(pev->target); 3129 if (!cache) 3130 return 0; 3131 3132 entry = probe_cache__find(cache, pev); 3133 if (!entry) { 3134 /* SDT must be in the cache */ 3135 ret = pev->sdt ? -ENOENT : 0; 3136 goto out; 3137 } 3138 3139 ret = strlist__nr_entries(entry->tevlist); 3140 if (ret > probe_conf.max_probes) { 3141 pr_debug("Too many entries matched in the cache of %s\n", 3142 pev->target ? : "kernel"); 3143 ret = -E2BIG; 3144 goto out; 3145 } 3146 3147 *tevs = zalloc(ret * sizeof(*tev)); 3148 if (!*tevs) { 3149 ret = -ENOMEM; 3150 goto out; 3151 } 3152 3153 i = 0; 3154 strlist__for_each_entry(node, entry->tevlist) { 3155 tev = &(*tevs)[i++]; 3156 ret = parse_probe_trace_command(node->s, tev); 3157 if (ret < 0) 3158 goto out; 3159 /* Set the uprobes attribute as same as original */ 3160 tev->uprobes = pev->uprobes; 3161 } 3162 ret = i; 3163 3164 out: 3165 probe_cache__delete(cache); 3166 return ret; 3167 } 3168 3169 static int convert_to_probe_trace_events(struct perf_probe_event *pev, 3170 struct probe_trace_event **tevs) 3171 { 3172 int ret; 3173 3174 if (!pev->group && !pev->sdt) { 3175 /* Set group name if not given */ 3176 if (!pev->uprobes) { 3177 pev->group = strdup(PERFPROBE_GROUP); 3178 ret = pev->group ? 0 : -ENOMEM; 3179 } else 3180 ret = convert_exec_to_group(pev->target, &pev->group); 3181 if (ret != 0) { 3182 pr_warning("Failed to make a group name.\n"); 3183 return ret; 3184 } 3185 } 3186 3187 ret = try_to_find_absolute_address(pev, tevs); 3188 if (ret > 0) 3189 return ret; 3190 3191 /* At first, we need to lookup cache entry */ 3192 ret = find_probe_trace_events_from_cache(pev, tevs); 3193 if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ 3194 return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ 3195 3196 /* Convert perf_probe_event with debuginfo */ 3197 ret = try_to_find_probe_trace_events(pev, tevs); 3198 if (ret != 0) 3199 return ret; /* Found in debuginfo or got an error */ 3200 3201 return find_probe_trace_events_from_map(pev, tevs); 3202 } 3203 3204 int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3205 { 3206 int i, ret; 3207 3208 /* Loop 1: convert all events */ 3209 for (i = 0; i < npevs; i++) { 3210 /* Init kprobe blacklist if needed */ 3211 if (!pevs[i].uprobes) 3212 kprobe_blacklist__init(); 3213 /* Convert with or without debuginfo */ 3214 ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); 3215 if (ret < 0) 3216 return ret; 3217 pevs[i].ntevs = ret; 3218 } 3219 /* This just release blacklist only if allocated */ 3220 kprobe_blacklist__release(); 3221 3222 return 0; 3223 } 3224 3225 static int show_probe_trace_event(struct probe_trace_event *tev) 3226 { 3227 char *buf = synthesize_probe_trace_command(tev); 3228 3229 if (!buf) { 3230 pr_debug("Failed to synthesize probe trace event.\n"); 3231 return -EINVAL; 3232 } 3233 3234 /* Showing definition always go stdout */ 3235 printf("%s\n", buf); 3236 free(buf); 3237 3238 return 0; 3239 } 3240 3241 int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) 3242 { 3243 struct strlist *namelist = strlist__new(NULL, NULL); 3244 struct probe_trace_event *tev; 3245 struct perf_probe_event *pev; 3246 int i, j, ret = 0; 3247 3248 if (!namelist) 3249 return -ENOMEM; 3250 3251 for (j = 0; j < npevs && !ret; j++) { 3252 pev = &pevs[j]; 3253 for (i = 0; i < pev->ntevs && !ret; i++) { 3254 tev = &pev->tevs[i]; 3255 /* Skip if the symbol is out of .text or blacklisted */ 3256 if (!tev->point.symbol && !pev->uprobes) 3257 continue; 3258 3259 /* Set new name for tev (and update namelist) */ 3260 ret = probe_trace_event__set_name(tev, pev, 3261 namelist, true); 3262 if (!ret) 3263 ret = show_probe_trace_event(tev); 3264 } 3265 } 3266 strlist__delete(namelist); 3267 3268 return ret; 3269 } 3270 3271 int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3272 { 3273 int i, ret = 0; 3274 3275 /* Loop 2: add all events */ 3276 for (i = 0; i < npevs; i++) { 3277 ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, 3278 pevs[i].ntevs, 3279 probe_conf.force_add); 3280 if (ret < 0) 3281 break; 3282 } 3283 return ret; 3284 } 3285 3286 void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3287 { 3288 int i, j; 3289 3290 /* Loop 3: cleanup and free trace events */ 3291 for (i = 0; i < npevs; i++) { 3292 for (j = 0; j < pevs[i].ntevs; j++) 3293 clear_probe_trace_event(&pevs[i].tevs[j]); 3294 zfree(&pevs[i].tevs); 3295 pevs[i].ntevs = 0; 3296 clear_perf_probe_event(&pevs[i]); 3297 } 3298 } 3299 3300 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) 3301 { 3302 int ret; 3303 3304 ret = init_probe_symbol_maps(pevs->uprobes); 3305 if (ret < 0) 3306 return ret; 3307 3308 ret = convert_perf_probe_events(pevs, npevs); 3309 if (ret == 0) 3310 ret = apply_perf_probe_events(pevs, npevs); 3311 3312 cleanup_perf_probe_events(pevs, npevs); 3313 3314 exit_probe_symbol_maps(); 3315 return ret; 3316 } 3317 3318 int del_perf_probe_events(struct strfilter *filter) 3319 { 3320 int ret, ret2, ufd = -1, kfd = -1; 3321 char *str = strfilter__string(filter); 3322 3323 if (!str) 3324 return -EINVAL; 3325 3326 /* Get current event names */ 3327 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); 3328 if (ret < 0) 3329 goto out; 3330 3331 ret = probe_file__del_events(kfd, filter); 3332 if (ret < 0 && ret != -ENOENT) 3333 goto error; 3334 3335 ret2 = probe_file__del_events(ufd, filter); 3336 if (ret2 < 0 && ret2 != -ENOENT) { 3337 ret = ret2; 3338 goto error; 3339 } 3340 ret = 0; 3341 3342 error: 3343 if (kfd >= 0) 3344 close(kfd); 3345 if (ufd >= 0) 3346 close(ufd); 3347 out: 3348 free(str); 3349 3350 return ret; 3351 } 3352 3353 int show_available_funcs(const char *target, struct strfilter *_filter, 3354 bool user) 3355 { 3356 struct rb_node *nd; 3357 struct map *map; 3358 int ret; 3359 3360 ret = init_probe_symbol_maps(user); 3361 if (ret < 0) 3362 return ret; 3363 3364 /* Get a symbol map */ 3365 if (user) 3366 map = dso__new_map(target); 3367 else 3368 map = kernel_get_module_map(target); 3369 if (!map) { 3370 pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); 3371 return -EINVAL; 3372 } 3373 3374 ret = map__load(map); 3375 if (ret) { 3376 if (ret == -2) { 3377 char *str = strfilter__string(_filter); 3378 pr_err("Failed to find symbols matched to \"%s\"\n", 3379 str); 3380 free(str); 3381 } else 3382 pr_err("Failed to load symbols in %s\n", 3383 (target) ? : "kernel"); 3384 goto end; 3385 } 3386 if (!dso__sorted_by_name(map->dso, map->type)) 3387 dso__sort_by_name(map->dso, map->type); 3388 3389 /* Show all (filtered) symbols */ 3390 setup_pager(); 3391 3392 for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) { 3393 struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); 3394 3395 if (strfilter__compare(_filter, pos->sym.name)) 3396 printf("%s\n", pos->sym.name); 3397 } 3398 3399 end: 3400 if (user) { 3401 map__put(map); 3402 } 3403 exit_probe_symbol_maps(); 3404 3405 return ret; 3406 } 3407 3408 int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, 3409 struct perf_probe_arg *pvar) 3410 { 3411 tvar->value = strdup(pvar->var); 3412 if (tvar->value == NULL) 3413 return -ENOMEM; 3414 if (pvar->type) { 3415 tvar->type = strdup(pvar->type); 3416 if (tvar->type == NULL) 3417 return -ENOMEM; 3418 } 3419 if (pvar->name) { 3420 tvar->name = strdup(pvar->name); 3421 if (tvar->name == NULL) 3422 return -ENOMEM; 3423 } else 3424 tvar->name = NULL; 3425 return 0; 3426 } 3427