tools/perf/util/machine.c

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