1 #include <dirent.h> 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <regex.h> 5 #include "callchain.h" 6 #include "debug.h" 7 #include "event.h" 8 #include "evsel.h" 9 #include "hist.h" 10 #include "machine.h" 11 #include "map.h" 12 #include "sort.h" 13 #include "strlist.h" 14 #include "thread.h" 15 #include "vdso.h" 16 #include <stdbool.h> 17 #include <sys/types.h> 18 #include <sys/stat.h> 19 #include <unistd.h> 20 #include "unwind.h" 21 #include "linux/hash.h" 22 #include "asm/bug.h" 23 24 #include "sane_ctype.h" 25 #include <symbol/kallsyms.h> 26 27 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock); 28 29 static void dsos__init(struct dsos *dsos) 30 { 31 INIT_LIST_HEAD(&dsos->head); 32 dsos->root = RB_ROOT; 33 init_rwsem(&dsos->lock); 34 } 35 36 static void machine__threads_init(struct machine *machine) 37 { 38 int i; 39 40 for (i = 0; i < THREADS__TABLE_SIZE; i++) { 41 struct threads *threads = &machine->threads[i]; 42 threads->entries = RB_ROOT; 43 init_rwsem(&threads->lock); 44 threads->nr = 0; 45 INIT_LIST_HEAD(&threads->dead); 46 threads->last_match = NULL; 47 } 48 } 49 50 int machine__init(struct machine *machine, const char *root_dir, pid_t pid) 51 { 52 memset(machine, 0, sizeof(*machine)); 53 map_groups__init(&machine->kmaps, machine); 54 RB_CLEAR_NODE(&machine->rb_node); 55 dsos__init(&machine->dsos); 56 57 machine__threads_init(machine); 58 59 machine->vdso_info = NULL; 60 machine->env = NULL; 61 62 machine->pid = pid; 63 64 machine->id_hdr_size = 0; 65 machine->kptr_restrict_warned = false; 66 machine->comm_exec = false; 67 machine->kernel_start = 0; 68 69 memset(machine->vmlinux_maps, 0, sizeof(machine->vmlinux_maps)); 70 71 machine->root_dir = strdup(root_dir); 72 if (machine->root_dir == NULL) 73 return -ENOMEM; 74 75 if (pid != HOST_KERNEL_ID) { 76 struct thread *thread = machine__findnew_thread(machine, -1, 77 pid); 78 char comm[64]; 79 80 if (thread == NULL) 81 return -ENOMEM; 82 83 snprintf(comm, sizeof(comm), "[guest/%d]", pid); 84 thread__set_comm(thread, comm, 0); 85 thread__put(thread); 86 } 87 88 machine->current_tid = NULL; 89 90 return 0; 91 } 92 93 struct machine *machine__new_host(void) 94 { 95 struct machine *machine = malloc(sizeof(*machine)); 96 97 if (machine != NULL) { 98 machine__init(machine, "", HOST_KERNEL_ID); 99 100 if (machine__create_kernel_maps(machine) < 0) 101 goto out_delete; 102 } 103 104 return machine; 105 out_delete: 106 free(machine); 107 return NULL; 108 } 109 110 struct machine *machine__new_kallsyms(void) 111 { 112 struct machine *machine = machine__new_host(); 113 /* 114 * FIXME: 115 * 1) MAP__FUNCTION will go away when we stop loading separate maps for 116 * functions and data objects. 117 * 2) We should switch to machine__load_kallsyms(), i.e. not explicitely 118 * ask for not using the kcore parsing code, once this one is fixed 119 * to create a map per module. 120 */ 121 if (machine && __machine__load_kallsyms(machine, "/proc/kallsyms", MAP__FUNCTION, true) <= 0) { 122 machine__delete(machine); 123 machine = NULL; 124 } 125 126 return machine; 127 } 128 129 static void dsos__purge(struct dsos *dsos) 130 { 131 struct dso *pos, *n; 132 133 down_write(&dsos->lock); 134 135 list_for_each_entry_safe(pos, n, &dsos->head, node) { 136 RB_CLEAR_NODE(&pos->rb_node); 137 pos->root = NULL; 138 list_del_init(&pos->node); 139 dso__put(pos); 140 } 141 142 up_write(&dsos->lock); 143 } 144 145 static void dsos__exit(struct dsos *dsos) 146 { 147 dsos__purge(dsos); 148 exit_rwsem(&dsos->lock); 149 } 150 151 void machine__delete_threads(struct machine *machine) 152 { 153 struct rb_node *nd; 154 int i; 155 156 for (i = 0; i < THREADS__TABLE_SIZE; i++) { 157 struct threads *threads = &machine->threads[i]; 158 down_write(&threads->lock); 159 nd = rb_first(&threads->entries); 160 while (nd) { 161 struct thread *t = rb_entry(nd, struct thread, rb_node); 162 163 nd = rb_next(nd); 164 __machine__remove_thread(machine, t, false); 165 } 166 up_write(&threads->lock); 167 } 168 } 169 170 void machine__exit(struct machine *machine) 171 { 172 int i; 173 174 machine__destroy_kernel_maps(machine); 175 map_groups__exit(&machine->kmaps); 176 dsos__exit(&machine->dsos); 177 machine__exit_vdso(machine); 178 zfree(&machine->root_dir); 179 zfree(&machine->current_tid); 180 181 for (i = 0; i < THREADS__TABLE_SIZE; i++) { 182 struct threads *threads = &machine->threads[i]; 183 exit_rwsem(&threads->lock); 184 } 185 } 186 187 void machine__delete(struct machine *machine) 188 { 189 if (machine) { 190 machine__exit(machine); 191 free(machine); 192 } 193 } 194 195 void machines__init(struct machines *machines) 196 { 197 machine__init(&machines->host, "", HOST_KERNEL_ID); 198 machines->guests = RB_ROOT; 199 } 200 201 void machines__exit(struct machines *machines) 202 { 203 machine__exit(&machines->host); 204 /* XXX exit guest */ 205 } 206 207 struct machine *machines__add(struct machines *machines, pid_t pid, 208 const char *root_dir) 209 { 210 struct rb_node **p = &machines->guests.rb_node; 211 struct rb_node *parent = NULL; 212 struct machine *pos, *machine = malloc(sizeof(*machine)); 213 214 if (machine == NULL) 215 return NULL; 216 217 if (machine__init(machine, root_dir, pid) != 0) { 218 free(machine); 219 return NULL; 220 } 221 222 while (*p != NULL) { 223 parent = *p; 224 pos = rb_entry(parent, struct machine, rb_node); 225 if (pid < pos->pid) 226 p = &(*p)->rb_left; 227 else 228 p = &(*p)->rb_right; 229 } 230 231 rb_link_node(&machine->rb_node, parent, p); 232 rb_insert_color(&machine->rb_node, &machines->guests); 233 234 return machine; 235 } 236 237 void machines__set_comm_exec(struct machines *machines, bool comm_exec) 238 { 239 struct rb_node *nd; 240 241 machines->host.comm_exec = comm_exec; 242 243 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 244 struct machine *machine = rb_entry(nd, struct machine, rb_node); 245 246 machine->comm_exec = comm_exec; 247 } 248 } 249 250 struct machine *machines__find(struct machines *machines, pid_t pid) 251 { 252 struct rb_node **p = &machines->guests.rb_node; 253 struct rb_node *parent = NULL; 254 struct machine *machine; 255 struct machine *default_machine = NULL; 256 257 if (pid == HOST_KERNEL_ID) 258 return &machines->host; 259 260 while (*p != NULL) { 261 parent = *p; 262 machine = rb_entry(parent, struct machine, rb_node); 263 if (pid < machine->pid) 264 p = &(*p)->rb_left; 265 else if (pid > machine->pid) 266 p = &(*p)->rb_right; 267 else 268 return machine; 269 if (!machine->pid) 270 default_machine = machine; 271 } 272 273 return default_machine; 274 } 275 276 struct machine *machines__findnew(struct machines *machines, pid_t pid) 277 { 278 char path[PATH_MAX]; 279 const char *root_dir = ""; 280 struct machine *machine = machines__find(machines, pid); 281 282 if (machine && (machine->pid == pid)) 283 goto out; 284 285 if ((pid != HOST_KERNEL_ID) && 286 (pid != DEFAULT_GUEST_KERNEL_ID) && 287 (symbol_conf.guestmount)) { 288 sprintf(path, "%s/%d", symbol_conf.guestmount, pid); 289 if (access(path, R_OK)) { 290 static struct strlist *seen; 291 292 if (!seen) 293 seen = strlist__new(NULL, NULL); 294 295 if (!strlist__has_entry(seen, path)) { 296 pr_err("Can't access file %s\n", path); 297 strlist__add(seen, path); 298 } 299 machine = NULL; 300 goto out; 301 } 302 root_dir = path; 303 } 304 305 machine = machines__add(machines, pid, root_dir); 306 out: 307 return machine; 308 } 309 310 void machines__process_guests(struct machines *machines, 311 machine__process_t process, void *data) 312 { 313 struct rb_node *nd; 314 315 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 316 struct machine *pos = rb_entry(nd, struct machine, rb_node); 317 process(pos, data); 318 } 319 } 320 321 char *machine__mmap_name(struct machine *machine, char *bf, size_t size) 322 { 323 if (machine__is_host(machine)) 324 snprintf(bf, size, "[%s]", "kernel.kallsyms"); 325 else if (machine__is_default_guest(machine)) 326 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms"); 327 else { 328 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms", 329 machine->pid); 330 } 331 332 return bf; 333 } 334 335 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size) 336 { 337 struct rb_node *node; 338 struct machine *machine; 339 340 machines->host.id_hdr_size = id_hdr_size; 341 342 for (node = rb_first(&machines->guests); node; node = rb_next(node)) { 343 machine = rb_entry(node, struct machine, rb_node); 344 machine->id_hdr_size = id_hdr_size; 345 } 346 347 return; 348 } 349 350 static void machine__update_thread_pid(struct machine *machine, 351 struct thread *th, pid_t pid) 352 { 353 struct thread *leader; 354 355 if (pid == th->pid_ || pid == -1 || th->pid_ != -1) 356 return; 357 358 th->pid_ = pid; 359 360 if (th->pid_ == th->tid) 361 return; 362 363 leader = __machine__findnew_thread(machine, th->pid_, th->pid_); 364 if (!leader) 365 goto out_err; 366 367 if (!leader->mg) 368 leader->mg = map_groups__new(machine); 369 370 if (!leader->mg) 371 goto out_err; 372 373 if (th->mg == leader->mg) 374 return; 375 376 if (th->mg) { 377 /* 378 * Maps are created from MMAP events which provide the pid and 379 * tid. Consequently there never should be any maps on a thread 380 * with an unknown pid. Just print an error if there are. 381 */ 382 if (!map_groups__empty(th->mg)) 383 pr_err("Discarding thread maps for %d:%d\n", 384 th->pid_, th->tid); 385 map_groups__put(th->mg); 386 } 387 388 th->mg = map_groups__get(leader->mg); 389 out_put: 390 thread__put(leader); 391 return; 392 out_err: 393 pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid); 394 goto out_put; 395 } 396 397 /* 398 * Caller must eventually drop thread->refcnt returned with a successful 399 * lookup/new thread inserted. 400 */ 401 static struct thread *____machine__findnew_thread(struct machine *machine, 402 struct threads *threads, 403 pid_t pid, pid_t tid, 404 bool create) 405 { 406 struct rb_node **p = &threads->entries.rb_node; 407 struct rb_node *parent = NULL; 408 struct thread *th; 409 410 /* 411 * Front-end cache - TID lookups come in blocks, 412 * so most of the time we dont have to look up 413 * the full rbtree: 414 */ 415 th = threads->last_match; 416 if (th != NULL) { 417 if (th->tid == tid) { 418 machine__update_thread_pid(machine, th, pid); 419 return thread__get(th); 420 } 421 422 threads->last_match = NULL; 423 } 424 425 while (*p != NULL) { 426 parent = *p; 427 th = rb_entry(parent, struct thread, rb_node); 428 429 if (th->tid == tid) { 430 threads->last_match = th; 431 machine__update_thread_pid(machine, th, pid); 432 return thread__get(th); 433 } 434 435 if (tid < th->tid) 436 p = &(*p)->rb_left; 437 else 438 p = &(*p)->rb_right; 439 } 440 441 if (!create) 442 return NULL; 443 444 th = thread__new(pid, tid); 445 if (th != NULL) { 446 rb_link_node(&th->rb_node, parent, p); 447 rb_insert_color(&th->rb_node, &threads->entries); 448 449 /* 450 * We have to initialize map_groups separately 451 * after rb tree is updated. 452 * 453 * The reason is that we call machine__findnew_thread 454 * within thread__init_map_groups to find the thread 455 * leader and that would screwed the rb tree. 456 */ 457 if (thread__init_map_groups(th, machine)) { 458 rb_erase_init(&th->rb_node, &threads->entries); 459 RB_CLEAR_NODE(&th->rb_node); 460 thread__put(th); 461 return NULL; 462 } 463 /* 464 * It is now in the rbtree, get a ref 465 */ 466 thread__get(th); 467 threads->last_match = th; 468 ++threads->nr; 469 } 470 471 return th; 472 } 473 474 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid) 475 { 476 return ____machine__findnew_thread(machine, machine__threads(machine, tid), pid, tid, true); 477 } 478 479 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid, 480 pid_t tid) 481 { 482 struct threads *threads = machine__threads(machine, tid); 483 struct thread *th; 484 485 down_write(&threads->lock); 486 th = __machine__findnew_thread(machine, pid, tid); 487 up_write(&threads->lock); 488 return th; 489 } 490 491 struct thread *machine__find_thread(struct machine *machine, pid_t pid, 492 pid_t tid) 493 { 494 struct threads *threads = machine__threads(machine, tid); 495 struct thread *th; 496 497 down_read(&threads->lock); 498 th = ____machine__findnew_thread(machine, threads, pid, tid, false); 499 up_read(&threads->lock); 500 return th; 501 } 502 503 struct comm *machine__thread_exec_comm(struct machine *machine, 504 struct thread *thread) 505 { 506 if (machine->comm_exec) 507 return thread__exec_comm(thread); 508 else 509 return thread__comm(thread); 510 } 511 512 int machine__process_comm_event(struct machine *machine, union perf_event *event, 513 struct perf_sample *sample) 514 { 515 struct thread *thread = machine__findnew_thread(machine, 516 event->comm.pid, 517 event->comm.tid); 518 bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC; 519 int err = 0; 520 521 if (exec) 522 machine->comm_exec = true; 523 524 if (dump_trace) 525 perf_event__fprintf_comm(event, stdout); 526 527 if (thread == NULL || 528 __thread__set_comm(thread, event->comm.comm, sample->time, exec)) { 529 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n"); 530 err = -1; 531 } 532 533 thread__put(thread); 534 535 return err; 536 } 537 538 int machine__process_namespaces_event(struct machine *machine __maybe_unused, 539 union perf_event *event, 540 struct perf_sample *sample __maybe_unused) 541 { 542 struct thread *thread = machine__findnew_thread(machine, 543 event->namespaces.pid, 544 event->namespaces.tid); 545 int err = 0; 546 547 WARN_ONCE(event->namespaces.nr_namespaces > NR_NAMESPACES, 548 "\nWARNING: kernel seems to support more namespaces than perf" 549 " tool.\nTry updating the perf tool..\n\n"); 550 551 WARN_ONCE(event->namespaces.nr_namespaces < NR_NAMESPACES, 552 "\nWARNING: perf tool seems to support more namespaces than" 553 " the kernel.\nTry updating the kernel..\n\n"); 554 555 if (dump_trace) 556 perf_event__fprintf_namespaces(event, stdout); 557 558 if (thread == NULL || 559 thread__set_namespaces(thread, sample->time, &event->namespaces)) { 560 dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n"); 561 err = -1; 562 } 563 564 thread__put(thread); 565 566 return err; 567 } 568 569 int machine__process_lost_event(struct machine *machine __maybe_unused, 570 union perf_event *event, struct perf_sample *sample __maybe_unused) 571 { 572 dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n", 573 event->lost.id, event->lost.lost); 574 return 0; 575 } 576 577 int machine__process_lost_samples_event(struct machine *machine __maybe_unused, 578 union perf_event *event, struct perf_sample *sample) 579 { 580 dump_printf(": id:%" PRIu64 ": lost samples :%" PRIu64 "\n", 581 sample->id, event->lost_samples.lost); 582 return 0; 583 } 584 585 static struct dso *machine__findnew_module_dso(struct machine *machine, 586 struct kmod_path *m, 587 const char *filename) 588 { 589 struct dso *dso; 590 591 down_write(&machine->dsos.lock); 592 593 dso = __dsos__find(&machine->dsos, m->name, true); 594 if (!dso) { 595 dso = __dsos__addnew(&machine->dsos, m->name); 596 if (dso == NULL) 597 goto out_unlock; 598 599 dso__set_module_info(dso, m, machine); 600 dso__set_long_name(dso, strdup(filename), true); 601 } 602 603 dso__get(dso); 604 out_unlock: 605 up_write(&machine->dsos.lock); 606 return dso; 607 } 608 609 int machine__process_aux_event(struct machine *machine __maybe_unused, 610 union perf_event *event) 611 { 612 if (dump_trace) 613 perf_event__fprintf_aux(event, stdout); 614 return 0; 615 } 616 617 int machine__process_itrace_start_event(struct machine *machine __maybe_unused, 618 union perf_event *event) 619 { 620 if (dump_trace) 621 perf_event__fprintf_itrace_start(event, stdout); 622 return 0; 623 } 624 625 int machine__process_switch_event(struct machine *machine __maybe_unused, 626 union perf_event *event) 627 { 628 if (dump_trace) 629 perf_event__fprintf_switch(event, stdout); 630 return 0; 631 } 632 633 static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename) 634 { 635 const char *dup_filename; 636 637 if (!filename || !dso || !dso->long_name) 638 return; 639 if (dso->long_name[0] != '[') 640 return; 641 if (!strchr(filename, '/')) 642 return; 643 644 dup_filename = strdup(filename); 645 if (!dup_filename) 646 return; 647 648 dso__set_long_name(dso, dup_filename, true); 649 } 650 651 struct map *machine__findnew_module_map(struct machine *machine, u64 start, 652 const char *filename) 653 { 654 struct map *map = NULL; 655 struct dso *dso = NULL; 656 struct kmod_path m; 657 658 if (kmod_path__parse_name(&m, filename)) 659 return NULL; 660 661 map = map_groups__find_by_name(&machine->kmaps, MAP__FUNCTION, 662 m.name); 663 if (map) { 664 /* 665 * If the map's dso is an offline module, give dso__load() 666 * a chance to find the file path of that module by fixing 667 * long_name. 668 */ 669 dso__adjust_kmod_long_name(map->dso, filename); 670 goto out; 671 } 672 673 dso = machine__findnew_module_dso(machine, &m, filename); 674 if (dso == NULL) 675 goto out; 676 677 map = map__new2(start, dso, MAP__FUNCTION); 678 if (map == NULL) 679 goto out; 680 681 map_groups__insert(&machine->kmaps, map); 682 683 /* Put the map here because map_groups__insert alread got it */ 684 map__put(map); 685 out: 686 /* put the dso here, corresponding to machine__findnew_module_dso */ 687 dso__put(dso); 688 free(m.name); 689 return map; 690 } 691 692 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp) 693 { 694 struct rb_node *nd; 695 size_t ret = __dsos__fprintf(&machines->host.dsos.head, fp); 696 697 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 698 struct machine *pos = rb_entry(nd, struct machine, rb_node); 699 ret += __dsos__fprintf(&pos->dsos.head, fp); 700 } 701 702 return ret; 703 } 704 705 size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp, 706 bool (skip)(struct dso *dso, int parm), int parm) 707 { 708 return __dsos__fprintf_buildid(&m->dsos.head, fp, skip, parm); 709 } 710 711 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp, 712 bool (skip)(struct dso *dso, int parm), int parm) 713 { 714 struct rb_node *nd; 715 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm); 716 717 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 718 struct machine *pos = rb_entry(nd, struct machine, rb_node); 719 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm); 720 } 721 return ret; 722 } 723 724 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) 725 { 726 int i; 727 size_t printed = 0; 728 struct dso *kdso = machine__kernel_map(machine)->dso; 729 730 if (kdso->has_build_id) { 731 char filename[PATH_MAX]; 732 if (dso__build_id_filename(kdso, filename, sizeof(filename), 733 false)) 734 printed += fprintf(fp, "[0] %s\n", filename); 735 } 736 737 for (i = 0; i < vmlinux_path__nr_entries; ++i) 738 printed += fprintf(fp, "[%d] %s\n", 739 i + kdso->has_build_id, vmlinux_path[i]); 740 741 return printed; 742 } 743 744 size_t machine__fprintf(struct machine *machine, FILE *fp) 745 { 746 struct rb_node *nd; 747 size_t ret; 748 int i; 749 750 for (i = 0; i < THREADS__TABLE_SIZE; i++) { 751 struct threads *threads = &machine->threads[i]; 752 753 down_read(&threads->lock); 754 755 ret = fprintf(fp, "Threads: %u\n", threads->nr); 756 757 for (nd = rb_first(&threads->entries); nd; nd = rb_next(nd)) { 758 struct thread *pos = rb_entry(nd, struct thread, rb_node); 759 760 ret += thread__fprintf(pos, fp); 761 } 762 763 up_read(&threads->lock); 764 } 765 return ret; 766 } 767 768 static struct dso *machine__get_kernel(struct machine *machine) 769 { 770 const char *vmlinux_name = NULL; 771 struct dso *kernel; 772 773 if (machine__is_host(machine)) { 774 vmlinux_name = symbol_conf.vmlinux_name; 775 if (!vmlinux_name) 776 vmlinux_name = DSO__NAME_KALLSYMS; 777 778 kernel = machine__findnew_kernel(machine, vmlinux_name, 779 "[kernel]", DSO_TYPE_KERNEL); 780 } else { 781 char bf[PATH_MAX]; 782 783 if (machine__is_default_guest(machine)) 784 vmlinux_name = symbol_conf.default_guest_vmlinux_name; 785 if (!vmlinux_name) 786 vmlinux_name = machine__mmap_name(machine, bf, 787 sizeof(bf)); 788 789 kernel = machine__findnew_kernel(machine, vmlinux_name, 790 "[guest.kernel]", 791 DSO_TYPE_GUEST_KERNEL); 792 } 793 794 if (kernel != NULL && (!kernel->has_build_id)) 795 dso__read_running_kernel_build_id(kernel, machine); 796 797 return kernel; 798 } 799 800 struct process_args { 801 u64 start; 802 }; 803 804 static void machine__get_kallsyms_filename(struct machine *machine, char *buf, 805 size_t bufsz) 806 { 807 if (machine__is_default_guest(machine)) 808 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms); 809 else 810 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir); 811 } 812 813 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL}; 814 815 /* Figure out the start address of kernel map from /proc/kallsyms. 816 * Returns the name of the start symbol in *symbol_name. Pass in NULL as 817 * symbol_name if it's not that important. 818 */ 819 static int machine__get_running_kernel_start(struct machine *machine, 820 const char **symbol_name, u64 *start) 821 { 822 char filename[PATH_MAX]; 823 int i, err = -1; 824 const char *name; 825 u64 addr = 0; 826 827 machine__get_kallsyms_filename(machine, filename, PATH_MAX); 828 829 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 830 return 0; 831 832 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { 833 err = kallsyms__get_function_start(filename, name, &addr); 834 if (!err) 835 break; 836 } 837 838 if (err) 839 return -1; 840 841 if (symbol_name) 842 *symbol_name = name; 843 844 *start = addr; 845 return 0; 846 } 847 848 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel) 849 { 850 int type; 851 u64 start = 0; 852 853 if (machine__get_running_kernel_start(machine, NULL, &start)) 854 return -1; 855 856 /* In case of renewal the kernel map, destroy previous one */ 857 machine__destroy_kernel_maps(machine); 858 859 for (type = 0; type < MAP__NR_TYPES; ++type) { 860 struct kmap *kmap; 861 struct map *map; 862 863 machine->vmlinux_maps[type] = map__new2(start, kernel, type); 864 if (machine->vmlinux_maps[type] == NULL) 865 return -1; 866 867 machine->vmlinux_maps[type]->map_ip = 868 machine->vmlinux_maps[type]->unmap_ip = 869 identity__map_ip; 870 map = __machine__kernel_map(machine, type); 871 kmap = map__kmap(map); 872 if (!kmap) 873 return -1; 874 875 kmap->kmaps = &machine->kmaps; 876 map_groups__insert(&machine->kmaps, map); 877 } 878 879 return 0; 880 } 881 882 void machine__destroy_kernel_maps(struct machine *machine) 883 { 884 int type; 885 886 for (type = 0; type < MAP__NR_TYPES; ++type) { 887 struct kmap *kmap; 888 struct map *map = __machine__kernel_map(machine, type); 889 890 if (map == NULL) 891 continue; 892 893 kmap = map__kmap(map); 894 map_groups__remove(&machine->kmaps, map); 895 if (kmap && kmap->ref_reloc_sym) { 896 /* 897 * ref_reloc_sym is shared among all maps, so free just 898 * on one of them. 899 */ 900 if (type == MAP__FUNCTION) { 901 zfree((char **)&kmap->ref_reloc_sym->name); 902 zfree(&kmap->ref_reloc_sym); 903 } else 904 kmap->ref_reloc_sym = NULL; 905 } 906 907 map__put(machine->vmlinux_maps[type]); 908 machine->vmlinux_maps[type] = NULL; 909 } 910 } 911 912 int machines__create_guest_kernel_maps(struct machines *machines) 913 { 914 int ret = 0; 915 struct dirent **namelist = NULL; 916 int i, items = 0; 917 char path[PATH_MAX]; 918 pid_t pid; 919 char *endp; 920 921 if (symbol_conf.default_guest_vmlinux_name || 922 symbol_conf.default_guest_modules || 923 symbol_conf.default_guest_kallsyms) { 924 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID); 925 } 926 927 if (symbol_conf.guestmount) { 928 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL); 929 if (items <= 0) 930 return -ENOENT; 931 for (i = 0; i < items; i++) { 932 if (!isdigit(namelist[i]->d_name[0])) { 933 /* Filter out . and .. */ 934 continue; 935 } 936 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10); 937 if ((*endp != '\0') || 938 (endp == namelist[i]->d_name) || 939 (errno == ERANGE)) { 940 pr_debug("invalid directory (%s). Skipping.\n", 941 namelist[i]->d_name); 942 continue; 943 } 944 sprintf(path, "%s/%s/proc/kallsyms", 945 symbol_conf.guestmount, 946 namelist[i]->d_name); 947 ret = access(path, R_OK); 948 if (ret) { 949 pr_debug("Can't access file %s\n", path); 950 goto failure; 951 } 952 machines__create_kernel_maps(machines, pid); 953 } 954 failure: 955 free(namelist); 956 } 957 958 return ret; 959 } 960 961 void machines__destroy_kernel_maps(struct machines *machines) 962 { 963 struct rb_node *next = rb_first(&machines->guests); 964 965 machine__destroy_kernel_maps(&machines->host); 966 967 while (next) { 968 struct machine *pos = rb_entry(next, struct machine, rb_node); 969 970 next = rb_next(&pos->rb_node); 971 rb_erase(&pos->rb_node, &machines->guests); 972 machine__delete(pos); 973 } 974 } 975 976 int machines__create_kernel_maps(struct machines *machines, pid_t pid) 977 { 978 struct machine *machine = machines__findnew(machines, pid); 979 980 if (machine == NULL) 981 return -1; 982 983 return machine__create_kernel_maps(machine); 984 } 985 986 int __machine__load_kallsyms(struct machine *machine, const char *filename, 987 enum map_type type, bool no_kcore) 988 { 989 struct map *map = machine__kernel_map(machine); 990 int ret = __dso__load_kallsyms(map->dso, filename, map, no_kcore); 991 992 if (ret > 0) { 993 dso__set_loaded(map->dso, type); 994 /* 995 * Since /proc/kallsyms will have multiple sessions for the 996 * kernel, with modules between them, fixup the end of all 997 * sections. 998 */ 999 __map_groups__fixup_end(&machine->kmaps, type); 1000 } 1001 1002 return ret; 1003 } 1004 1005 int machine__load_kallsyms(struct machine *machine, const char *filename, 1006 enum map_type type) 1007 { 1008 return __machine__load_kallsyms(machine, filename, type, false); 1009 } 1010 1011 int machine__load_vmlinux_path(struct machine *machine, enum map_type type) 1012 { 1013 struct map *map = machine__kernel_map(machine); 1014 int ret = dso__load_vmlinux_path(map->dso, map); 1015 1016 if (ret > 0) 1017 dso__set_loaded(map->dso, type); 1018 1019 return ret; 1020 } 1021 1022 static void map_groups__fixup_end(struct map_groups *mg) 1023 { 1024 int i; 1025 for (i = 0; i < MAP__NR_TYPES; ++i) 1026 __map_groups__fixup_end(mg, i); 1027 } 1028 1029 static char *get_kernel_version(const char *root_dir) 1030 { 1031 char version[PATH_MAX]; 1032 FILE *file; 1033 char *name, *tmp; 1034 const char *prefix = "Linux version "; 1035 1036 sprintf(version, "%s/proc/version", root_dir); 1037 file = fopen(version, "r"); 1038 if (!file) 1039 return NULL; 1040 1041 version[0] = '\0'; 1042 tmp = fgets(version, sizeof(version), file); 1043 fclose(file); 1044 1045 name = strstr(version, prefix); 1046 if (!name) 1047 return NULL; 1048 name += strlen(prefix); 1049 tmp = strchr(name, ' '); 1050 if (tmp) 1051 *tmp = '\0'; 1052 1053 return strdup(name); 1054 } 1055 1056 static bool is_kmod_dso(struct dso *dso) 1057 { 1058 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || 1059 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE; 1060 } 1061 1062 static int map_groups__set_module_path(struct map_groups *mg, const char *path, 1063 struct kmod_path *m) 1064 { 1065 struct map *map; 1066 char *long_name; 1067 1068 map = map_groups__find_by_name(mg, MAP__FUNCTION, m->name); 1069 if (map == NULL) 1070 return 0; 1071 1072 long_name = strdup(path); 1073 if (long_name == NULL) 1074 return -ENOMEM; 1075 1076 dso__set_long_name(map->dso, long_name, true); 1077 dso__kernel_module_get_build_id(map->dso, ""); 1078 1079 /* 1080 * Full name could reveal us kmod compression, so 1081 * we need to update the symtab_type if needed. 1082 */ 1083 if (m->comp && is_kmod_dso(map->dso)) 1084 map->dso->symtab_type++; 1085 1086 return 0; 1087 } 1088 1089 static int map_groups__set_modules_path_dir(struct map_groups *mg, 1090 const char *dir_name, int depth) 1091 { 1092 struct dirent *dent; 1093 DIR *dir = opendir(dir_name); 1094 int ret = 0; 1095 1096 if (!dir) { 1097 pr_debug("%s: cannot open %s dir\n", __func__, dir_name); 1098 return -1; 1099 } 1100 1101 while ((dent = readdir(dir)) != NULL) { 1102 char path[PATH_MAX]; 1103 struct stat st; 1104 1105 /*sshfs might return bad dent->d_type, so we have to stat*/ 1106 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); 1107 if (stat(path, &st)) 1108 continue; 1109 1110 if (S_ISDIR(st.st_mode)) { 1111 if (!strcmp(dent->d_name, ".") || 1112 !strcmp(dent->d_name, "..")) 1113 continue; 1114 1115 /* Do not follow top-level source and build symlinks */ 1116 if (depth == 0) { 1117 if (!strcmp(dent->d_name, "source") || 1118 !strcmp(dent->d_name, "build")) 1119 continue; 1120 } 1121 1122 ret = map_groups__set_modules_path_dir(mg, path, 1123 depth + 1); 1124 if (ret < 0) 1125 goto out; 1126 } else { 1127 struct kmod_path m; 1128 1129 ret = kmod_path__parse_name(&m, dent->d_name); 1130 if (ret) 1131 goto out; 1132 1133 if (m.kmod) 1134 ret = map_groups__set_module_path(mg, path, &m); 1135 1136 free(m.name); 1137 1138 if (ret) 1139 goto out; 1140 } 1141 } 1142 1143 out: 1144 closedir(dir); 1145 return ret; 1146 } 1147 1148 static int machine__set_modules_path(struct machine *machine) 1149 { 1150 char *version; 1151 char modules_path[PATH_MAX]; 1152 1153 version = get_kernel_version(machine->root_dir); 1154 if (!version) 1155 return -1; 1156 1157 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s", 1158 machine->root_dir, version); 1159 free(version); 1160 1161 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0); 1162 } 1163 int __weak arch__fix_module_text_start(u64 *start __maybe_unused, 1164 const char *name __maybe_unused) 1165 { 1166 return 0; 1167 } 1168 1169 static int machine__create_module(void *arg, const char *name, u64 start, 1170 u64 size) 1171 { 1172 struct machine *machine = arg; 1173 struct map *map; 1174 1175 if (arch__fix_module_text_start(&start, name) < 0) 1176 return -1; 1177 1178 map = machine__findnew_module_map(machine, start, name); 1179 if (map == NULL) 1180 return -1; 1181 map->end = start + size; 1182 1183 dso__kernel_module_get_build_id(map->dso, machine->root_dir); 1184 1185 return 0; 1186 } 1187 1188 static int machine__create_modules(struct machine *machine) 1189 { 1190 const char *modules; 1191 char path[PATH_MAX]; 1192 1193 if (machine__is_default_guest(machine)) { 1194 modules = symbol_conf.default_guest_modules; 1195 } else { 1196 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir); 1197 modules = path; 1198 } 1199 1200 if (symbol__restricted_filename(modules, "/proc/modules")) 1201 return -1; 1202 1203 if (modules__parse(modules, machine, machine__create_module)) 1204 return -1; 1205 1206 if (!machine__set_modules_path(machine)) 1207 return 0; 1208 1209 pr_debug("Problems setting modules path maps, continuing anyway...\n"); 1210 1211 return 0; 1212 } 1213 1214 int machine__create_kernel_maps(struct machine *machine) 1215 { 1216 struct dso *kernel = machine__get_kernel(machine); 1217 const char *name = NULL; 1218 u64 addr = 0; 1219 int ret; 1220 1221 if (kernel == NULL) 1222 return -1; 1223 1224 ret = __machine__create_kernel_maps(machine, kernel); 1225 dso__put(kernel); 1226 if (ret < 0) 1227 return -1; 1228 1229 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) { 1230 if (machine__is_host(machine)) 1231 pr_debug("Problems creating module maps, " 1232 "continuing anyway...\n"); 1233 else 1234 pr_debug("Problems creating module maps for guest %d, " 1235 "continuing anyway...\n", machine->pid); 1236 } 1237 1238 /* 1239 * Now that we have all the maps created, just set the ->end of them: 1240 */ 1241 map_groups__fixup_end(&machine->kmaps); 1242 1243 if (!machine__get_running_kernel_start(machine, &name, &addr)) { 1244 if (name && 1245 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name, addr)) { 1246 machine__destroy_kernel_maps(machine); 1247 return -1; 1248 } 1249 } 1250 1251 return 0; 1252 } 1253 1254 static void machine__set_kernel_mmap_len(struct machine *machine, 1255 union perf_event *event) 1256 { 1257 int i; 1258 1259 for (i = 0; i < MAP__NR_TYPES; i++) { 1260 machine->vmlinux_maps[i]->start = event->mmap.start; 1261 machine->vmlinux_maps[i]->end = (event->mmap.start + 1262 event->mmap.len); 1263 /* 1264 * Be a bit paranoid here, some perf.data file came with 1265 * a zero sized synthesized MMAP event for the kernel. 1266 */ 1267 if (machine->vmlinux_maps[i]->end == 0) 1268 machine->vmlinux_maps[i]->end = ~0ULL; 1269 } 1270 } 1271 1272 static bool machine__uses_kcore(struct machine *machine) 1273 { 1274 struct dso *dso; 1275 1276 list_for_each_entry(dso, &machine->dsos.head, node) { 1277 if (dso__is_kcore(dso)) 1278 return true; 1279 } 1280 1281 return false; 1282 } 1283 1284 static int machine__process_kernel_mmap_event(struct machine *machine, 1285 union perf_event *event) 1286 { 1287 struct map *map; 1288 char kmmap_prefix[PATH_MAX]; 1289 enum dso_kernel_type kernel_type; 1290 bool is_kernel_mmap; 1291 1292 /* If we have maps from kcore then we do not need or want any others */ 1293 if (machine__uses_kcore(machine)) 1294 return 0; 1295 1296 machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix)); 1297 if (machine__is_host(machine)) 1298 kernel_type = DSO_TYPE_KERNEL; 1299 else 1300 kernel_type = DSO_TYPE_GUEST_KERNEL; 1301 1302 is_kernel_mmap = memcmp(event->mmap.filename, 1303 kmmap_prefix, 1304 strlen(kmmap_prefix) - 1) == 0; 1305 if (event->mmap.filename[0] == '/' || 1306 (!is_kernel_mmap && event->mmap.filename[0] == '[')) { 1307 map = machine__findnew_module_map(machine, event->mmap.start, 1308 event->mmap.filename); 1309 if (map == NULL) 1310 goto out_problem; 1311 1312 map->end = map->start + event->mmap.len; 1313 } else if (is_kernel_mmap) { 1314 const char *symbol_name = (event->mmap.filename + 1315 strlen(kmmap_prefix)); 1316 /* 1317 * Should be there already, from the build-id table in 1318 * the header. 1319 */ 1320 struct dso *kernel = NULL; 1321 struct dso *dso; 1322 1323 down_read(&machine->dsos.lock); 1324 1325 list_for_each_entry(dso, &machine->dsos.head, node) { 1326 1327 /* 1328 * The cpumode passed to is_kernel_module is not the 1329 * cpumode of *this* event. If we insist on passing 1330 * correct cpumode to is_kernel_module, we should 1331 * record the cpumode when we adding this dso to the 1332 * linked list. 1333 * 1334 * However we don't really need passing correct 1335 * cpumode. We know the correct cpumode must be kernel 1336 * mode (if not, we should not link it onto kernel_dsos 1337 * list). 1338 * 1339 * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN. 1340 * is_kernel_module() treats it as a kernel cpumode. 1341 */ 1342 1343 if (!dso->kernel || 1344 is_kernel_module(dso->long_name, 1345 PERF_RECORD_MISC_CPUMODE_UNKNOWN)) 1346 continue; 1347 1348 1349 kernel = dso; 1350 break; 1351 } 1352 1353 up_read(&machine->dsos.lock); 1354 1355 if (kernel == NULL) 1356 kernel = machine__findnew_dso(machine, kmmap_prefix); 1357 if (kernel == NULL) 1358 goto out_problem; 1359 1360 kernel->kernel = kernel_type; 1361 if (__machine__create_kernel_maps(machine, kernel) < 0) { 1362 dso__put(kernel); 1363 goto out_problem; 1364 } 1365 1366 if (strstr(kernel->long_name, "vmlinux")) 1367 dso__set_short_name(kernel, "[kernel.vmlinux]", false); 1368 1369 machine__set_kernel_mmap_len(machine, event); 1370 1371 /* 1372 * Avoid using a zero address (kptr_restrict) for the ref reloc 1373 * symbol. Effectively having zero here means that at record 1374 * time /proc/sys/kernel/kptr_restrict was non zero. 1375 */ 1376 if (event->mmap.pgoff != 0) { 1377 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, 1378 symbol_name, 1379 event->mmap.pgoff); 1380 } 1381 1382 if (machine__is_default_guest(machine)) { 1383 /* 1384 * preload dso of guest kernel and modules 1385 */ 1386 dso__load(kernel, machine__kernel_map(machine)); 1387 } 1388 } 1389 return 0; 1390 out_problem: 1391 return -1; 1392 } 1393 1394 int machine__process_mmap2_event(struct machine *machine, 1395 union perf_event *event, 1396 struct perf_sample *sample) 1397 { 1398 struct thread *thread; 1399 struct map *map; 1400 enum map_type type; 1401 int ret = 0; 1402 1403 if (dump_trace) 1404 perf_event__fprintf_mmap2(event, stdout); 1405 1406 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL || 1407 sample->cpumode == PERF_RECORD_MISC_KERNEL) { 1408 ret = machine__process_kernel_mmap_event(machine, event); 1409 if (ret < 0) 1410 goto out_problem; 1411 return 0; 1412 } 1413 1414 thread = machine__findnew_thread(machine, event->mmap2.pid, 1415 event->mmap2.tid); 1416 if (thread == NULL) 1417 goto out_problem; 1418 1419 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) 1420 type = MAP__VARIABLE; 1421 else 1422 type = MAP__FUNCTION; 1423 1424 map = map__new(machine, event->mmap2.start, 1425 event->mmap2.len, event->mmap2.pgoff, 1426 event->mmap2.maj, 1427 event->mmap2.min, event->mmap2.ino, 1428 event->mmap2.ino_generation, 1429 event->mmap2.prot, 1430 event->mmap2.flags, 1431 event->mmap2.filename, type, thread); 1432 1433 if (map == NULL) 1434 goto out_problem_map; 1435 1436 ret = thread__insert_map(thread, map); 1437 if (ret) 1438 goto out_problem_insert; 1439 1440 thread__put(thread); 1441 map__put(map); 1442 return 0; 1443 1444 out_problem_insert: 1445 map__put(map); 1446 out_problem_map: 1447 thread__put(thread); 1448 out_problem: 1449 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n"); 1450 return 0; 1451 } 1452 1453 int machine__process_mmap_event(struct machine *machine, union perf_event *event, 1454 struct perf_sample *sample) 1455 { 1456 struct thread *thread; 1457 struct map *map; 1458 enum map_type type; 1459 int ret = 0; 1460 1461 if (dump_trace) 1462 perf_event__fprintf_mmap(event, stdout); 1463 1464 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL || 1465 sample->cpumode == PERF_RECORD_MISC_KERNEL) { 1466 ret = machine__process_kernel_mmap_event(machine, event); 1467 if (ret < 0) 1468 goto out_problem; 1469 return 0; 1470 } 1471 1472 thread = machine__findnew_thread(machine, event->mmap.pid, 1473 event->mmap.tid); 1474 if (thread == NULL) 1475 goto out_problem; 1476 1477 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) 1478 type = MAP__VARIABLE; 1479 else 1480 type = MAP__FUNCTION; 1481 1482 map = map__new(machine, event->mmap.start, 1483 event->mmap.len, event->mmap.pgoff, 1484 0, 0, 0, 0, 0, 0, 1485 event->mmap.filename, 1486 type, thread); 1487 1488 if (map == NULL) 1489 goto out_problem_map; 1490 1491 ret = thread__insert_map(thread, map); 1492 if (ret) 1493 goto out_problem_insert; 1494 1495 thread__put(thread); 1496 map__put(map); 1497 return 0; 1498 1499 out_problem_insert: 1500 map__put(map); 1501 out_problem_map: 1502 thread__put(thread); 1503 out_problem: 1504 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n"); 1505 return 0; 1506 } 1507 1508 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock) 1509 { 1510 struct threads *threads = machine__threads(machine, th->tid); 1511 1512 if (threads->last_match == th) 1513 threads->last_match = NULL; 1514 1515 BUG_ON(refcount_read(&th->refcnt) == 0); 1516 if (lock) 1517 down_write(&threads->lock); 1518 rb_erase_init(&th->rb_node, &threads->entries); 1519 RB_CLEAR_NODE(&th->rb_node); 1520 --threads->nr; 1521 /* 1522 * Move it first to the dead_threads list, then drop the reference, 1523 * if this is the last reference, then the thread__delete destructor 1524 * will be called and we will remove it from the dead_threads list. 1525 */ 1526 list_add_tail(&th->node, &threads->dead); 1527 if (lock) 1528 up_write(&threads->lock); 1529 thread__put(th); 1530 } 1531 1532 void machine__remove_thread(struct machine *machine, struct thread *th) 1533 { 1534 return __machine__remove_thread(machine, th, true); 1535 } 1536 1537 int machine__process_fork_event(struct machine *machine, union perf_event *event, 1538 struct perf_sample *sample) 1539 { 1540 struct thread *thread = machine__find_thread(machine, 1541 event->fork.pid, 1542 event->fork.tid); 1543 struct thread *parent = machine__findnew_thread(machine, 1544 event->fork.ppid, 1545 event->fork.ptid); 1546 int err = 0; 1547 1548 if (dump_trace) 1549 perf_event__fprintf_task(event, stdout); 1550 1551 /* 1552 * There may be an existing thread that is not actually the parent, 1553 * either because we are processing events out of order, or because the 1554 * (fork) event that would have removed the thread was lost. Assume the 1555 * latter case and continue on as best we can. 1556 */ 1557 if (parent->pid_ != (pid_t)event->fork.ppid) { 1558 dump_printf("removing erroneous parent thread %d/%d\n", 1559 parent->pid_, parent->tid); 1560 machine__remove_thread(machine, parent); 1561 thread__put(parent); 1562 parent = machine__findnew_thread(machine, event->fork.ppid, 1563 event->fork.ptid); 1564 } 1565 1566 /* if a thread currently exists for the thread id remove it */ 1567 if (thread != NULL) { 1568 machine__remove_thread(machine, thread); 1569 thread__put(thread); 1570 } 1571 1572 thread = machine__findnew_thread(machine, event->fork.pid, 1573 event->fork.tid); 1574 1575 if (thread == NULL || parent == NULL || 1576 thread__fork(thread, parent, sample->time) < 0) { 1577 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n"); 1578 err = -1; 1579 } 1580 thread__put(thread); 1581 thread__put(parent); 1582 1583 return err; 1584 } 1585 1586 int machine__process_exit_event(struct machine *machine, union perf_event *event, 1587 struct perf_sample *sample __maybe_unused) 1588 { 1589 struct thread *thread = machine__find_thread(machine, 1590 event->fork.pid, 1591 event->fork.tid); 1592 1593 if (dump_trace) 1594 perf_event__fprintf_task(event, stdout); 1595 1596 if (thread != NULL) { 1597 thread__exited(thread); 1598 thread__put(thread); 1599 } 1600 1601 return 0; 1602 } 1603 1604 int machine__process_event(struct machine *machine, union perf_event *event, 1605 struct perf_sample *sample) 1606 { 1607 int ret; 1608 1609 switch (event->header.type) { 1610 case PERF_RECORD_COMM: 1611 ret = machine__process_comm_event(machine, event, sample); break; 1612 case PERF_RECORD_MMAP: 1613 ret = machine__process_mmap_event(machine, event, sample); break; 1614 case PERF_RECORD_NAMESPACES: 1615 ret = machine__process_namespaces_event(machine, event, sample); break; 1616 case PERF_RECORD_MMAP2: 1617 ret = machine__process_mmap2_event(machine, event, sample); break; 1618 case PERF_RECORD_FORK: 1619 ret = machine__process_fork_event(machine, event, sample); break; 1620 case PERF_RECORD_EXIT: 1621 ret = machine__process_exit_event(machine, event, sample); break; 1622 case PERF_RECORD_LOST: 1623 ret = machine__process_lost_event(machine, event, sample); break; 1624 case PERF_RECORD_AUX: 1625 ret = machine__process_aux_event(machine, event); break; 1626 case PERF_RECORD_ITRACE_START: 1627 ret = machine__process_itrace_start_event(machine, event); break; 1628 case PERF_RECORD_LOST_SAMPLES: 1629 ret = machine__process_lost_samples_event(machine, event, sample); break; 1630 case PERF_RECORD_SWITCH: 1631 case PERF_RECORD_SWITCH_CPU_WIDE: 1632 ret = machine__process_switch_event(machine, event); break; 1633 default: 1634 ret = -1; 1635 break; 1636 } 1637 1638 return ret; 1639 } 1640 1641 static bool symbol__match_regex(struct symbol *sym, regex_t *regex) 1642 { 1643 if (!regexec(regex, sym->name, 0, NULL, 0)) 1644 return 1; 1645 return 0; 1646 } 1647 1648 static void ip__resolve_ams(struct thread *thread, 1649 struct addr_map_symbol *ams, 1650 u64 ip) 1651 { 1652 struct addr_location al; 1653 1654 memset(&al, 0, sizeof(al)); 1655 /* 1656 * We cannot use the header.misc hint to determine whether a 1657 * branch stack address is user, kernel, guest, hypervisor. 1658 * Branches may straddle the kernel/user/hypervisor boundaries. 1659 * Thus, we have to try consecutively until we find a match 1660 * or else, the symbol is unknown 1661 */ 1662 thread__find_cpumode_addr_location(thread, MAP__FUNCTION, ip, &al); 1663 1664 ams->addr = ip; 1665 ams->al_addr = al.addr; 1666 ams->sym = al.sym; 1667 ams->map = al.map; 1668 ams->phys_addr = 0; 1669 } 1670 1671 static void ip__resolve_data(struct thread *thread, 1672 u8 m, struct addr_map_symbol *ams, 1673 u64 addr, u64 phys_addr) 1674 { 1675 struct addr_location al; 1676 1677 memset(&al, 0, sizeof(al)); 1678 1679 thread__find_addr_location(thread, m, MAP__VARIABLE, addr, &al); 1680 if (al.map == NULL) { 1681 /* 1682 * some shared data regions have execute bit set which puts 1683 * their mapping in the MAP__FUNCTION type array. 1684 * Check there as a fallback option before dropping the sample. 1685 */ 1686 thread__find_addr_location(thread, m, MAP__FUNCTION, addr, &al); 1687 } 1688 1689 ams->addr = addr; 1690 ams->al_addr = al.addr; 1691 ams->sym = al.sym; 1692 ams->map = al.map; 1693 ams->phys_addr = phys_addr; 1694 } 1695 1696 struct mem_info *sample__resolve_mem(struct perf_sample *sample, 1697 struct addr_location *al) 1698 { 1699 struct mem_info *mi = zalloc(sizeof(*mi)); 1700 1701 if (!mi) 1702 return NULL; 1703 1704 ip__resolve_ams(al->thread, &mi->iaddr, sample->ip); 1705 ip__resolve_data(al->thread, al->cpumode, &mi->daddr, 1706 sample->addr, sample->phys_addr); 1707 mi->data_src.val = sample->data_src; 1708 1709 return mi; 1710 } 1711 1712 struct iterations { 1713 int nr_loop_iter; 1714 u64 cycles; 1715 }; 1716 1717 static int add_callchain_ip(struct thread *thread, 1718 struct callchain_cursor *cursor, 1719 struct symbol **parent, 1720 struct addr_location *root_al, 1721 u8 *cpumode, 1722 u64 ip, 1723 bool branch, 1724 struct branch_flags *flags, 1725 struct iterations *iter, 1726 u64 branch_from) 1727 { 1728 struct addr_location al; 1729 int nr_loop_iter = 0; 1730 u64 iter_cycles = 0; 1731 1732 al.filtered = 0; 1733 al.sym = NULL; 1734 if (!cpumode) { 1735 thread__find_cpumode_addr_location(thread, MAP__FUNCTION, 1736 ip, &al); 1737 } else { 1738 if (ip >= PERF_CONTEXT_MAX) { 1739 switch (ip) { 1740 case PERF_CONTEXT_HV: 1741 *cpumode = PERF_RECORD_MISC_HYPERVISOR; 1742 break; 1743 case PERF_CONTEXT_KERNEL: 1744 *cpumode = PERF_RECORD_MISC_KERNEL; 1745 break; 1746 case PERF_CONTEXT_USER: 1747 *cpumode = PERF_RECORD_MISC_USER; 1748 break; 1749 default: 1750 pr_debug("invalid callchain context: " 1751 "%"PRId64"\n", (s64) ip); 1752 /* 1753 * It seems the callchain is corrupted. 1754 * Discard all. 1755 */ 1756 callchain_cursor_reset(cursor); 1757 return 1; 1758 } 1759 return 0; 1760 } 1761 thread__find_addr_location(thread, *cpumode, MAP__FUNCTION, 1762 ip, &al); 1763 } 1764 1765 if (al.sym != NULL) { 1766 if (perf_hpp_list.parent && !*parent && 1767 symbol__match_regex(al.sym, &parent_regex)) 1768 *parent = al.sym; 1769 else if (have_ignore_callees && root_al && 1770 symbol__match_regex(al.sym, &ignore_callees_regex)) { 1771 /* Treat this symbol as the root, 1772 forgetting its callees. */ 1773 *root_al = al; 1774 callchain_cursor_reset(cursor); 1775 } 1776 } 1777 1778 if (symbol_conf.hide_unresolved && al.sym == NULL) 1779 return 0; 1780 1781 if (iter) { 1782 nr_loop_iter = iter->nr_loop_iter; 1783 iter_cycles = iter->cycles; 1784 } 1785 1786 return callchain_cursor_append(cursor, al.addr, al.map, al.sym, 1787 branch, flags, nr_loop_iter, 1788 iter_cycles, branch_from); 1789 } 1790 1791 struct branch_info *sample__resolve_bstack(struct perf_sample *sample, 1792 struct addr_location *al) 1793 { 1794 unsigned int i; 1795 const struct branch_stack *bs = sample->branch_stack; 1796 struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info)); 1797 1798 if (!bi) 1799 return NULL; 1800 1801 for (i = 0; i < bs->nr; i++) { 1802 ip__resolve_ams(al->thread, &bi[i].to, bs->entries[i].to); 1803 ip__resolve_ams(al->thread, &bi[i].from, bs->entries[i].from); 1804 bi[i].flags = bs->entries[i].flags; 1805 } 1806 return bi; 1807 } 1808 1809 static void save_iterations(struct iterations *iter, 1810 struct branch_entry *be, int nr) 1811 { 1812 int i; 1813 1814 iter->nr_loop_iter = nr; 1815 iter->cycles = 0; 1816 1817 for (i = 0; i < nr; i++) 1818 iter->cycles += be[i].flags.cycles; 1819 } 1820 1821 #define CHASHSZ 127 1822 #define CHASHBITS 7 1823 #define NO_ENTRY 0xff 1824 1825 #define PERF_MAX_BRANCH_DEPTH 127 1826 1827 /* Remove loops. */ 1828 static int remove_loops(struct branch_entry *l, int nr, 1829 struct iterations *iter) 1830 { 1831 int i, j, off; 1832 unsigned char chash[CHASHSZ]; 1833 1834 memset(chash, NO_ENTRY, sizeof(chash)); 1835 1836 BUG_ON(PERF_MAX_BRANCH_DEPTH > 255); 1837 1838 for (i = 0; i < nr; i++) { 1839 int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ; 1840 1841 /* no collision handling for now */ 1842 if (chash[h] == NO_ENTRY) { 1843 chash[h] = i; 1844 } else if (l[chash[h]].from == l[i].from) { 1845 bool is_loop = true; 1846 /* check if it is a real loop */ 1847 off = 0; 1848 for (j = chash[h]; j < i && i + off < nr; j++, off++) 1849 if (l[j].from != l[i + off].from) { 1850 is_loop = false; 1851 break; 1852 } 1853 if (is_loop) { 1854 j = nr - (i + off); 1855 if (j > 0) { 1856 save_iterations(iter + i + off, 1857 l + i, off); 1858 1859 memmove(iter + i, iter + i + off, 1860 j * sizeof(*iter)); 1861 1862 memmove(l + i, l + i + off, 1863 j * sizeof(*l)); 1864 } 1865 1866 nr -= off; 1867 } 1868 } 1869 } 1870 return nr; 1871 } 1872 1873 /* 1874 * Recolve LBR callstack chain sample 1875 * Return: 1876 * 1 on success get LBR callchain information 1877 * 0 no available LBR callchain information, should try fp 1878 * negative error code on other errors. 1879 */ 1880 static int resolve_lbr_callchain_sample(struct thread *thread, 1881 struct callchain_cursor *cursor, 1882 struct perf_sample *sample, 1883 struct symbol **parent, 1884 struct addr_location *root_al, 1885 int max_stack) 1886 { 1887 struct ip_callchain *chain = sample->callchain; 1888 int chain_nr = min(max_stack, (int)chain->nr), i; 1889 u8 cpumode = PERF_RECORD_MISC_USER; 1890 u64 ip, branch_from = 0; 1891 1892 for (i = 0; i < chain_nr; i++) { 1893 if (chain->ips[i] == PERF_CONTEXT_USER) 1894 break; 1895 } 1896 1897 /* LBR only affects the user callchain */ 1898 if (i != chain_nr) { 1899 struct branch_stack *lbr_stack = sample->branch_stack; 1900 int lbr_nr = lbr_stack->nr, j, k; 1901 bool branch; 1902 struct branch_flags *flags; 1903 /* 1904 * LBR callstack can only get user call chain. 1905 * The mix_chain_nr is kernel call chain 1906 * number plus LBR user call chain number. 1907 * i is kernel call chain number, 1908 * 1 is PERF_CONTEXT_USER, 1909 * lbr_nr + 1 is the user call chain number. 1910 * For details, please refer to the comments 1911 * in callchain__printf 1912 */ 1913 int mix_chain_nr = i + 1 + lbr_nr + 1; 1914 1915 for (j = 0; j < mix_chain_nr; j++) { 1916 int err; 1917 branch = false; 1918 flags = NULL; 1919 1920 if (callchain_param.order == ORDER_CALLEE) { 1921 if (j < i + 1) 1922 ip = chain->ips[j]; 1923 else if (j > i + 1) { 1924 k = j - i - 2; 1925 ip = lbr_stack->entries[k].from; 1926 branch = true; 1927 flags = &lbr_stack->entries[k].flags; 1928 } else { 1929 ip = lbr_stack->entries[0].to; 1930 branch = true; 1931 flags = &lbr_stack->entries[0].flags; 1932 branch_from = 1933 lbr_stack->entries[0].from; 1934 } 1935 } else { 1936 if (j < lbr_nr) { 1937 k = lbr_nr - j - 1; 1938 ip = lbr_stack->entries[k].from; 1939 branch = true; 1940 flags = &lbr_stack->entries[k].flags; 1941 } 1942 else if (j > lbr_nr) 1943 ip = chain->ips[i + 1 - (j - lbr_nr)]; 1944 else { 1945 ip = lbr_stack->entries[0].to; 1946 branch = true; 1947 flags = &lbr_stack->entries[0].flags; 1948 branch_from = 1949 lbr_stack->entries[0].from; 1950 } 1951 } 1952 1953 err = add_callchain_ip(thread, cursor, parent, 1954 root_al, &cpumode, ip, 1955 branch, flags, NULL, 1956 branch_from); 1957 if (err) 1958 return (err < 0) ? err : 0; 1959 } 1960 return 1; 1961 } 1962 1963 return 0; 1964 } 1965 1966 static int thread__resolve_callchain_sample(struct thread *thread, 1967 struct callchain_cursor *cursor, 1968 struct perf_evsel *evsel, 1969 struct perf_sample *sample, 1970 struct symbol **parent, 1971 struct addr_location *root_al, 1972 int max_stack) 1973 { 1974 struct branch_stack *branch = sample->branch_stack; 1975 struct ip_callchain *chain = sample->callchain; 1976 int chain_nr = 0; 1977 u8 cpumode = PERF_RECORD_MISC_USER; 1978 int i, j, err, nr_entries; 1979 int skip_idx = -1; 1980 int first_call = 0; 1981 1982 if (chain) 1983 chain_nr = chain->nr; 1984 1985 if (perf_evsel__has_branch_callstack(evsel)) { 1986 err = resolve_lbr_callchain_sample(thread, cursor, sample, parent, 1987 root_al, max_stack); 1988 if (err) 1989 return (err < 0) ? err : 0; 1990 } 1991 1992 /* 1993 * Based on DWARF debug information, some architectures skip 1994 * a callchain entry saved by the kernel. 1995 */ 1996 skip_idx = arch_skip_callchain_idx(thread, chain); 1997 1998 /* 1999 * Add branches to call stack for easier browsing. This gives 2000 * more context for a sample than just the callers. 2001 * 2002 * This uses individual histograms of paths compared to the 2003 * aggregated histograms the normal LBR mode uses. 2004 * 2005 * Limitations for now: 2006 * - No extra filters 2007 * - No annotations (should annotate somehow) 2008 */ 2009 2010 if (branch && callchain_param.branch_callstack) { 2011 int nr = min(max_stack, (int)branch->nr); 2012 struct branch_entry be[nr]; 2013 struct iterations iter[nr]; 2014 2015 if (branch->nr > PERF_MAX_BRANCH_DEPTH) { 2016 pr_warning("corrupted branch chain. skipping...\n"); 2017 goto check_calls; 2018 } 2019 2020 for (i = 0; i < nr; i++) { 2021 if (callchain_param.order == ORDER_CALLEE) { 2022 be[i] = branch->entries[i]; 2023 2024 if (chain == NULL) 2025 continue; 2026 2027 /* 2028 * Check for overlap into the callchain. 2029 * The return address is one off compared to 2030 * the branch entry. To adjust for this 2031 * assume the calling instruction is not longer 2032 * than 8 bytes. 2033 */ 2034 if (i == skip_idx || 2035 chain->ips[first_call] >= PERF_CONTEXT_MAX) 2036 first_call++; 2037 else if (be[i].from < chain->ips[first_call] && 2038 be[i].from >= chain->ips[first_call] - 8) 2039 first_call++; 2040 } else 2041 be[i] = branch->entries[branch->nr - i - 1]; 2042 } 2043 2044 memset(iter, 0, sizeof(struct iterations) * nr); 2045 nr = remove_loops(be, nr, iter); 2046 2047 for (i = 0; i < nr; i++) { 2048 err = add_callchain_ip(thread, cursor, parent, 2049 root_al, 2050 NULL, be[i].to, 2051 true, &be[i].flags, 2052 NULL, be[i].from); 2053 2054 if (!err) 2055 err = add_callchain_ip(thread, cursor, parent, root_al, 2056 NULL, be[i].from, 2057 true, &be[i].flags, 2058 &iter[i], 0); 2059 if (err == -EINVAL) 2060 break; 2061 if (err) 2062 return err; 2063 } 2064 2065 if (chain_nr == 0) 2066 return 0; 2067 2068 chain_nr -= nr; 2069 } 2070 2071 check_calls: 2072 for (i = first_call, nr_entries = 0; 2073 i < chain_nr && nr_entries < max_stack; i++) { 2074 u64 ip; 2075 2076 if (callchain_param.order == ORDER_CALLEE) 2077 j = i; 2078 else 2079 j = chain->nr - i - 1; 2080 2081 #ifdef HAVE_SKIP_CALLCHAIN_IDX 2082 if (j == skip_idx) 2083 continue; 2084 #endif 2085 ip = chain->ips[j]; 2086 2087 if (ip < PERF_CONTEXT_MAX) 2088 ++nr_entries; 2089 2090 err = add_callchain_ip(thread, cursor, parent, 2091 root_al, &cpumode, ip, 2092 false, NULL, NULL, 0); 2093 2094 if (err) 2095 return (err < 0) ? err : 0; 2096 } 2097 2098 return 0; 2099 } 2100 2101 static int unwind_entry(struct unwind_entry *entry, void *arg) 2102 { 2103 struct callchain_cursor *cursor = arg; 2104 2105 if (symbol_conf.hide_unresolved && entry->sym == NULL) 2106 return 0; 2107 return callchain_cursor_append(cursor, entry->ip, 2108 entry->map, entry->sym, 2109 false, NULL, 0, 0, 0); 2110 } 2111 2112 static int thread__resolve_callchain_unwind(struct thread *thread, 2113 struct callchain_cursor *cursor, 2114 struct perf_evsel *evsel, 2115 struct perf_sample *sample, 2116 int max_stack) 2117 { 2118 /* Can we do dwarf post unwind? */ 2119 if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) && 2120 (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER))) 2121 return 0; 2122 2123 /* Bail out if nothing was captured. */ 2124 if ((!sample->user_regs.regs) || 2125 (!sample->user_stack.size)) 2126 return 0; 2127 2128 return unwind__get_entries(unwind_entry, cursor, 2129 thread, sample, max_stack); 2130 } 2131 2132 int thread__resolve_callchain(struct thread *thread, 2133 struct callchain_cursor *cursor, 2134 struct perf_evsel *evsel, 2135 struct perf_sample *sample, 2136 struct symbol **parent, 2137 struct addr_location *root_al, 2138 int max_stack) 2139 { 2140 int ret = 0; 2141 2142 callchain_cursor_reset(&callchain_cursor); 2143 2144 if (callchain_param.order == ORDER_CALLEE) { 2145 ret = thread__resolve_callchain_sample(thread, cursor, 2146 evsel, sample, 2147 parent, root_al, 2148 max_stack); 2149 if (ret) 2150 return ret; 2151 ret = thread__resolve_callchain_unwind(thread, cursor, 2152 evsel, sample, 2153 max_stack); 2154 } else { 2155 ret = thread__resolve_callchain_unwind(thread, cursor, 2156 evsel, sample, 2157 max_stack); 2158 if (ret) 2159 return ret; 2160 ret = thread__resolve_callchain_sample(thread, cursor, 2161 evsel, sample, 2162 parent, root_al, 2163 max_stack); 2164 } 2165 2166 return ret; 2167 } 2168 2169 int machine__for_each_thread(struct machine *machine, 2170 int (*fn)(struct thread *thread, void *p), 2171 void *priv) 2172 { 2173 struct threads *threads; 2174 struct rb_node *nd; 2175 struct thread *thread; 2176 int rc = 0; 2177 int i; 2178 2179 for (i = 0; i < THREADS__TABLE_SIZE; i++) { 2180 threads = &machine->threads[i]; 2181 for (nd = rb_first(&threads->entries); nd; nd = rb_next(nd)) { 2182 thread = rb_entry(nd, struct thread, rb_node); 2183 rc = fn(thread, priv); 2184 if (rc != 0) 2185 return rc; 2186 } 2187 2188 list_for_each_entry(thread, &threads->dead, node) { 2189 rc = fn(thread, priv); 2190 if (rc != 0) 2191 return rc; 2192 } 2193 } 2194 return rc; 2195 } 2196 2197 int machines__for_each_thread(struct machines *machines, 2198 int (*fn)(struct thread *thread, void *p), 2199 void *priv) 2200 { 2201 struct rb_node *nd; 2202 int rc = 0; 2203 2204 rc = machine__for_each_thread(&machines->host, fn, priv); 2205 if (rc != 0) 2206 return rc; 2207 2208 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 2209 struct machine *machine = rb_entry(nd, struct machine, rb_node); 2210 2211 rc = machine__for_each_thread(machine, fn, priv); 2212 if (rc != 0) 2213 return rc; 2214 } 2215 return rc; 2216 } 2217 2218 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 2219 struct target *target, struct thread_map *threads, 2220 perf_event__handler_t process, bool data_mmap, 2221 unsigned int proc_map_timeout, 2222 unsigned int nr_threads_synthesize) 2223 { 2224 if (target__has_task(target)) 2225 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap, proc_map_timeout); 2226 else if (target__has_cpu(target)) 2227 return perf_event__synthesize_threads(tool, process, 2228 machine, data_mmap, 2229 proc_map_timeout, 2230 nr_threads_synthesize); 2231 /* command specified */ 2232 return 0; 2233 } 2234 2235 pid_t machine__get_current_tid(struct machine *machine, int cpu) 2236 { 2237 if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid) 2238 return -1; 2239 2240 return machine->current_tid[cpu]; 2241 } 2242 2243 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, 2244 pid_t tid) 2245 { 2246 struct thread *thread; 2247 2248 if (cpu < 0) 2249 return -EINVAL; 2250 2251 if (!machine->current_tid) { 2252 int i; 2253 2254 machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t)); 2255 if (!machine->current_tid) 2256 return -ENOMEM; 2257 for (i = 0; i < MAX_NR_CPUS; i++) 2258 machine->current_tid[i] = -1; 2259 } 2260 2261 if (cpu >= MAX_NR_CPUS) { 2262 pr_err("Requested CPU %d too large. ", cpu); 2263 pr_err("Consider raising MAX_NR_CPUS\n"); 2264 return -EINVAL; 2265 } 2266 2267 machine->current_tid[cpu] = tid; 2268 2269 thread = machine__findnew_thread(machine, pid, tid); 2270 if (!thread) 2271 return -ENOMEM; 2272 2273 thread->cpu = cpu; 2274 thread__put(thread); 2275 2276 return 0; 2277 } 2278 2279 int machine__get_kernel_start(struct machine *machine) 2280 { 2281 struct map *map = machine__kernel_map(machine); 2282 int err = 0; 2283 2284 /* 2285 * The only addresses above 2^63 are kernel addresses of a 64-bit 2286 * kernel. Note that addresses are unsigned so that on a 32-bit system 2287 * all addresses including kernel addresses are less than 2^32. In 2288 * that case (32-bit system), if the kernel mapping is unknown, all 2289 * addresses will be assumed to be in user space - see 2290 * machine__kernel_ip(). 2291 */ 2292 machine->kernel_start = 1ULL << 63; 2293 if (map) { 2294 err = map__load(map); 2295 if (!err) 2296 machine->kernel_start = map->start; 2297 } 2298 return err; 2299 } 2300 2301 struct dso *machine__findnew_dso(struct machine *machine, const char *filename) 2302 { 2303 return dsos__findnew(&machine->dsos, filename); 2304 } 2305 2306 char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp) 2307 { 2308 struct machine *machine = vmachine; 2309 struct map *map; 2310 struct symbol *sym = map_groups__find_symbol(&machine->kmaps, MAP__FUNCTION, *addrp, &map); 2311 2312 if (sym == NULL) 2313 return NULL; 2314 2315 *modp = __map__is_kmodule(map) ? (char *)map->dso->short_name : NULL; 2316 *addrp = map->unmap_ip(map, sym->start); 2317 return sym->name; 2318 } 2319