tools/perf/util/dso.c

   1 #include <asm/bug.h>
   2 #include <sys/time.h>
   3 #include <sys/resource.h>
   4 #include "symbol.h"
   5 #include "dso.h"
   6 #include "machine.h"
   7 #include "util.h"
   8 #include "debug.h"
   9
  10 char dso__symtab_origin(const struct dso *dso)
  11 {
  12         static const char origin[] = {
  13                 [DSO_BINARY_TYPE__KALLSYMS]                     = 'k',
  14                 [DSO_BINARY_TYPE__VMLINUX]                      = 'v',
  15                 [DSO_BINARY_TYPE__JAVA_JIT]                     = 'j',
  16                 [DSO_BINARY_TYPE__DEBUGLINK]                    = 'l',
  17                 [DSO_BINARY_TYPE__BUILD_ID_CACHE]               = 'B',
  18                 [DSO_BINARY_TYPE__FEDORA_DEBUGINFO]             = 'f',
  19                 [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO]             = 'u',
  20                 [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO]       = 'o',
  21                 [DSO_BINARY_TYPE__BUILDID_DEBUGINFO]            = 'b',
  22                 [DSO_BINARY_TYPE__SYSTEM_PATH_DSO]              = 'd',
  23                 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE]          = 'K',
  24                 [DSO_BINARY_TYPE__GUEST_KALLSYMS]               = 'g',
  25                 [DSO_BINARY_TYPE__GUEST_KMODULE]                = 'G',
  26                 [DSO_BINARY_TYPE__GUEST_VMLINUX]                = 'V',
  27         };
  28
  29         if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
  30                 return '!';
  31         return origin[dso->symtab_type];
  32 }
  33
  34 int dso__read_binary_type_filename(const struct dso *dso,
  35                                    enum dso_binary_type type,
  36                                    char *root_dir, char *filename, size_t size)
  37 {
  38         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  39         int ret = 0;
  40
  41         switch (type) {
  42         case DSO_BINARY_TYPE__DEBUGLINK: {
  43                 char *debuglink;
  44
  45                 strncpy(filename, dso->long_name, size);
  46                 debuglink = filename + dso->long_name_len;
  47                 while (debuglink != filename && *debuglink != '/')
  48                         debuglink--;
  49                 if (*debuglink == '/')
  50                         debuglink++;
  51                 ret = filename__read_debuglink(dso->long_name, debuglink,
  52                                                size - (debuglink - filename));
  53                 }
  54                 break;
  55         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
  56                 /* skip the locally configured cache if a symfs is given */
  57                 if (symbol_conf.symfs[0] ||
  58                     (dso__build_id_filename(dso, filename, size) == NULL))
  59                         ret = -1;
  60                 break;
  61
  62         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
  63                 snprintf(filename, size, "%s/usr/lib/debug%s.debug",
  64                          symbol_conf.symfs, dso->long_name);
  65                 break;
  66
  67         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
  68                 snprintf(filename, size, "%s/usr/lib/debug%s",
  69                          symbol_conf.symfs, dso->long_name);
  70                 break;
  71
  72         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
  73         {
  74                 const char *last_slash;
  75                 size_t len;
  76                 size_t dir_size;
  77
  78                 last_slash = dso->long_name + dso->long_name_len;
  79                 while (last_slash != dso->long_name && *last_slash != '/')
  80                         last_slash--;
  81
  82                 len = scnprintf(filename, size, "%s", symbol_conf.symfs);
  83                 dir_size = last_slash - dso->long_name + 2;
  84                 if (dir_size > (size - len)) {
  85                         ret = -1;
  86                         break;
  87                 }
  88                 len += scnprintf(filename + len, dir_size, "%s",  dso->long_name);
  89                 len += scnprintf(filename + len , size - len, ".debug%s",
  90                                                                 last_slash);
  91                 break;
  92         }
  93
  94         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
  95                 if (!dso->has_build_id) {
  96                         ret = -1;
  97                         break;
  98                 }
  99
 100                 build_id__sprintf(dso->build_id,
 101                                   sizeof(dso->build_id),
 102                                   build_id_hex);
 103                 snprintf(filename, size,
 104                          "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
 105                          symbol_conf.symfs, build_id_hex, build_id_hex + 2);
 106                 break;
 107
 108         case DSO_BINARY_TYPE__VMLINUX:
 109         case DSO_BINARY_TYPE__GUEST_VMLINUX:
 110         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
 111                 snprintf(filename, size, "%s%s",
 112                          symbol_conf.symfs, dso->long_name);
 113                 break;
 114
 115         case DSO_BINARY_TYPE__GUEST_KMODULE:
 116                 snprintf(filename, size, "%s%s%s", symbol_conf.symfs,
 117                          root_dir, dso->long_name);
 118                 break;
 119
 120         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
 121                 snprintf(filename, size, "%s%s", symbol_conf.symfs,
 122                          dso->long_name);
 123                 break;
 124
 125         case DSO_BINARY_TYPE__KCORE:
 126         case DSO_BINARY_TYPE__GUEST_KCORE:
 127                 snprintf(filename, size, "%s", dso->long_name);
 128                 break;
 129
 130         default:
 131         case DSO_BINARY_TYPE__KALLSYMS:
 132         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
 133         case DSO_BINARY_TYPE__JAVA_JIT:
 134         case DSO_BINARY_TYPE__NOT_FOUND:
 135                 ret = -1;
 136                 break;
 137         }
 138
 139         return ret;
 140 }
 141
 142 /*
 143  * Global list of open DSOs and the counter.
 144  */
 145 static LIST_HEAD(dso__data_open);
 146 static long dso__data_open_cnt;
 147
 148 static void dso__list_add(struct dso *dso)
 149 {
 150         list_add_tail(&dso->data.open_entry, &dso__data_open);
 151         dso__data_open_cnt++;
 152 }
 153
 154 static void dso__list_del(struct dso *dso)
 155 {
 156         list_del(&dso->data.open_entry);
 157         WARN_ONCE(dso__data_open_cnt <= 0,
 158                   "DSO data fd counter out of bounds.");
 159         dso__data_open_cnt--;
 160 }
 161
 162 static void close_first_dso(void);
 163
 164 static int do_open(char *name)
 165 {
 166         int fd;
 167
 168         do {
 169                 fd = open(name, O_RDONLY);
 170                 if (fd >= 0)
 171                         return fd;
 172
 173                 pr_debug("dso open failed, mmap: %s\n", strerror(errno));
 174                 if (!dso__data_open_cnt || errno != EMFILE)
 175                         break;
 176
 177                 close_first_dso();
 178         } while (1);
 179
 180         return -1;
 181 }
 182
 183 static int __open_dso(struct dso *dso, struct machine *machine)
 184 {
 185         int fd;
 186         char *root_dir = (char *)"";
 187         char *name = malloc(PATH_MAX);
 188
 189         if (!name)
 190                 return -ENOMEM;
 191
 192         if (machine)
 193                 root_dir = machine->root_dir;
 194
 195         if (dso__read_binary_type_filename(dso, dso->binary_type,
 196                                             root_dir, name, PATH_MAX)) {
 197                 free(name);
 198                 return -EINVAL;
 199         }
 200
 201         fd = do_open(name);
 202         free(name);
 203         return fd;
 204 }
 205
 206 static void check_data_close(void);
 207
 208 /**
 209  * dso_close - Open DSO data file
 210  * @dso: dso object
 211  *
 212  * Open @dso's data file descriptor and updates
 213  * list/count of open DSO objects.
 214  */
 215 static int open_dso(struct dso *dso, struct machine *machine)
 216 {
 217         int fd = __open_dso(dso, machine);
 218
 219         if (fd > 0) {
 220                 dso__list_add(dso);
 221                 /*
 222                  * Check if we crossed the allowed number
 223                  * of opened DSOs and close one if needed.
 224                  */
 225                 check_data_close();
 226         }
 227
 228         return fd;
 229 }
 230
 231 static void close_data_fd(struct dso *dso)
 232 {
 233         if (dso->data.fd >= 0) {
 234                 close(dso->data.fd);
 235                 dso->data.fd = -1;
 236                 dso->data.file_size = 0;
 237                 dso__list_del(dso);
 238         }
 239 }
 240
 241 /**
 242  * dso_close - Close DSO data file
 243  * @dso: dso object
 244  *
 245  * Close @dso's data file descriptor and updates
 246  * list/count of open DSO objects.
 247  */
 248 static void close_dso(struct dso *dso)
 249 {
 250         close_data_fd(dso);
 251 }
 252
 253 static void close_first_dso(void)
 254 {
 255         struct dso *dso;
 256
 257         dso = list_first_entry(&dso__data_open, struct dso, data.open_entry);
 258         close_dso(dso);
 259 }
 260
 261 static rlim_t get_fd_limit(void)
 262 {
 263         struct rlimit l;
 264         rlim_t limit = 0;
 265
 266         /* Allow half of the current open fd limit. */
 267         if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
 268                 if (l.rlim_cur == RLIM_INFINITY)
 269                         limit = l.rlim_cur;
 270                 else
 271                         limit = l.rlim_cur / 2;
 272         } else {
 273                 pr_err("failed to get fd limit\n");
 274                 limit = 1;
 275         }
 276
 277         return limit;
 278 }
 279
 280 static bool may_cache_fd(void)
 281 {
 282         static rlim_t limit;
 283
 284         if (!limit)
 285                 limit = get_fd_limit();
 286
 287         if (limit == RLIM_INFINITY)
 288                 return true;
 289
 290         return limit > (rlim_t) dso__data_open_cnt;
 291 }
 292
 293 /*
 294  * Check and close LRU dso if we crossed allowed limit
 295  * for opened dso file descriptors. The limit is half
 296  * of the RLIMIT_NOFILE files opened.
 297 */
 298 static void check_data_close(void)
 299 {
 300         bool cache_fd = may_cache_fd();
 301
 302         if (!cache_fd)
 303                 close_first_dso();
 304 }
 305
 306 /**
 307  * dso__data_close - Close DSO data file
 308  * @dso: dso object
 309  *
 310  * External interface to close @dso's data file descriptor.
 311  */
 312 void dso__data_close(struct dso *dso)
 313 {
 314         close_dso(dso);
 315 }
 316
 317 /**
 318  * dso__data_fd - Get dso's data file descriptor
 319  * @dso: dso object
 320  * @machine: machine object
 321  *
 322  * External interface to find dso's file, open it and
 323  * returns file descriptor.
 324  */
 325 int dso__data_fd(struct dso *dso, struct machine *machine)
 326 {
 327         enum dso_binary_type binary_type_data[] = {
 328                 DSO_BINARY_TYPE__BUILD_ID_CACHE,
 329                 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
 330                 DSO_BINARY_TYPE__NOT_FOUND,
 331         };
 332         int i = 0;
 333
 334         if (dso->data.fd >= 0)
 335                 return dso->data.fd;
 336
 337         if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
 338                 dso->data.fd = open_dso(dso, machine);
 339                 return dso->data.fd;
 340         }
 341
 342         do {
 343                 int fd;
 344
 345                 dso->binary_type = binary_type_data[i++];
 346
 347                 fd = open_dso(dso, machine);
 348                 if (fd >= 0)
 349                         return dso->data.fd = fd;
 350
 351         } while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
 352
 353         return -EINVAL;
 354 }
 355
 356 static void
 357 dso_cache__free(struct rb_root *root)
 358 {
 359         struct rb_node *next = rb_first(root);
 360
 361         while (next) {
 362                 struct dso_cache *cache;
 363
 364                 cache = rb_entry(next, struct dso_cache, rb_node);
 365                 next = rb_next(&cache->rb_node);
 366                 rb_erase(&cache->rb_node, root);
 367                 free(cache);
 368         }
 369 }
 370
 371 static struct dso_cache *dso_cache__find(const struct rb_root *root, u64 offset)
 372 {
 373         struct rb_node * const *p = &root->rb_node;
 374         const struct rb_node *parent = NULL;
 375         struct dso_cache *cache;
 376
 377         while (*p != NULL) {
 378                 u64 end;
 379
 380                 parent = *p;
 381                 cache = rb_entry(parent, struct dso_cache, rb_node);
 382                 end = cache->offset + DSO__DATA_CACHE_SIZE;
 383
 384                 if (offset < cache->offset)
 385                         p = &(*p)->rb_left;
 386                 else if (offset >= end)
 387                         p = &(*p)->rb_right;
 388                 else
 389                         return cache;
 390         }
 391         return NULL;
 392 }
 393
 394 static void
 395 dso_cache__insert(struct rb_root *root, struct dso_cache *new)
 396 {
 397         struct rb_node **p = &root->rb_node;
 398         struct rb_node *parent = NULL;
 399         struct dso_cache *cache;
 400         u64 offset = new->offset;
 401
 402         while (*p != NULL) {
 403                 u64 end;
 404
 405                 parent = *p;
 406                 cache = rb_entry(parent, struct dso_cache, rb_node);
 407                 end = cache->offset + DSO__DATA_CACHE_SIZE;
 408
 409                 if (offset < cache->offset)
 410                         p = &(*p)->rb_left;
 411                 else if (offset >= end)
 412                         p = &(*p)->rb_right;
 413         }
 414
 415         rb_link_node(&new->rb_node, parent, p);
 416         rb_insert_color(&new->rb_node, root);
 417 }
 418
 419 static ssize_t
 420 dso_cache__memcpy(struct dso_cache *cache, u64 offset,
 421                   u8 *data, u64 size)
 422 {
 423         u64 cache_offset = offset - cache->offset;
 424         u64 cache_size   = min(cache->size - cache_offset, size);
 425
 426         memcpy(data, cache->data + cache_offset, cache_size);
 427         return cache_size;
 428 }
 429
 430 static ssize_t
 431 dso_cache__read(struct dso *dso, u64 offset, u8 *data, ssize_t size)
 432 {
 433         struct dso_cache *cache;
 434         ssize_t ret;
 435
 436         do {
 437                 u64 cache_offset;
 438
 439                 ret = -ENOMEM;
 440
 441                 cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
 442                 if (!cache)
 443                         break;
 444
 445                 cache_offset = offset & DSO__DATA_CACHE_MASK;
 446                 ret = -EINVAL;
 447
 448                 if (-1 == lseek(dso->data.fd, cache_offset, SEEK_SET))
 449                         break;
 450
 451                 ret = read(dso->data.fd, cache->data, DSO__DATA_CACHE_SIZE);
 452                 if (ret <= 0)
 453                         break;
 454
 455                 cache->offset = cache_offset;
 456                 cache->size   = ret;
 457                 dso_cache__insert(&dso->data.cache, cache);
 458
 459                 ret = dso_cache__memcpy(cache, offset, data, size);
 460
 461         } while (0);
 462
 463         if (ret <= 0)
 464                 free(cache);
 465
 466         return ret;
 467 }
 468
 469 static ssize_t dso_cache_read(struct dso *dso, u64 offset,
 470                               u8 *data, ssize_t size)
 471 {
 472         struct dso_cache *cache;
 473
 474         cache = dso_cache__find(&dso->data.cache, offset);
 475         if (cache)
 476                 return dso_cache__memcpy(cache, offset, data, size);
 477         else
 478                 return dso_cache__read(dso, offset, data, size);
 479 }
 480
 481 /*
 482  * Reads and caches dso data DSO__DATA_CACHE_SIZE size chunks
 483  * in the rb_tree. Any read to already cached data is served
 484  * by cached data.
 485  */
 486 static ssize_t cached_read(struct dso *dso, u64 offset, u8 *data, ssize_t size)
 487 {
 488         ssize_t r = 0;
 489         u8 *p = data;
 490
 491         do {
 492                 ssize_t ret;
 493
 494                 ret = dso_cache_read(dso, offset, p, size);
 495                 if (ret < 0)
 496                         return ret;
 497
 498                 /* Reached EOF, return what we have. */
 499                 if (!ret)
 500                         break;
 501
 502                 BUG_ON(ret > size);
 503
 504                 r      += ret;
 505                 p      += ret;
 506                 offset += ret;
 507                 size   -= ret;
 508
 509         } while (size);
 510
 511         return r;
 512 }
 513
 514 static int data_file_size(struct dso *dso)
 515 {
 516         struct stat st;
 517
 518         if (!dso->data.file_size) {
 519                 if (fstat(dso->data.fd, &st)) {
 520                         pr_err("dso mmap failed, fstat: %s\n", strerror(errno));
 521                         return -1;
 522                 }
 523                 dso->data.file_size = st.st_size;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static ssize_t data_read_offset(struct dso *dso, u64 offset,
 530                                 u8 *data, ssize_t size)
 531 {
 532         if (data_file_size(dso))
 533                 return -1;
 534
 535         /* Check the offset sanity. */
 536         if (offset > dso->data.file_size)
 537                 return -1;
 538
 539         if (offset + size < offset)
 540                 return -1;
 541
 542         return cached_read(dso, offset, data, size);
 543 }
 544
 545 /**
 546  * dso__data_read_offset - Read data from dso file offset
 547  * @dso: dso object
 548  * @machine: machine object
 549  * @offset: file offset
 550  * @data: buffer to store data
 551  * @size: size of the @data buffer
 552  *
 553  * External interface to read data from dso file offset. Open
 554  * dso data file and use cached_read to get the data.
 555  */
 556 ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
 557                               u64 offset, u8 *data, ssize_t size)
 558 {
 559         if (dso__data_fd(dso, machine) < 0)
 560                 return -1;
 561
 562         return data_read_offset(dso, offset, data, size);
 563 }
 564
 565 /**
 566  * dso__data_read_addr - Read data from dso address
 567  * @dso: dso object
 568  * @machine: machine object
 569  * @add: virtual memory address
 570  * @data: buffer to store data
 571  * @size: size of the @data buffer
 572  *
 573  * External interface to read data from dso address.
 574  */
 575 ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
 576                             struct machine *machine, u64 addr,
 577                             u8 *data, ssize_t size)
 578 {
 579         u64 offset = map->map_ip(map, addr);
 580         return dso__data_read_offset(dso, machine, offset, data, size);
 581 }
 582
 583 struct map *dso__new_map(const char *name)
 584 {
 585         struct map *map = NULL;
 586         struct dso *dso = dso__new(name);
 587
 588         if (dso)
 589                 map = map__new2(0, dso, MAP__FUNCTION);
 590
 591         return map;
 592 }
 593
 594 struct dso *dso__kernel_findnew(struct machine *machine, const char *name,
 595                     const char *short_name, int dso_type)
 596 {
 597         /*
 598          * The kernel dso could be created by build_id processing.
 599          */
 600         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
 601
 602         /*
 603          * We need to run this in all cases, since during the build_id
 604          * processing we had no idea this was the kernel dso.
 605          */
 606         if (dso != NULL) {
 607                 dso__set_short_name(dso, short_name, false);
 608                 dso->kernel = dso_type;
 609         }
 610
 611         return dso;
 612 }
 613
 614 void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated)
 615 {
 616         if (name == NULL)
 617                 return;
 618
 619         if (dso->long_name_allocated)
 620                 free((char *)dso->long_name);
 621
 622         dso->long_name           = name;
 623         dso->long_name_len       = strlen(name);
 624         dso->long_name_allocated = name_allocated;
 625 }
 626
 627 void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated)
 628 {
 629         if (name == NULL)
 630                 return;
 631
 632         if (dso->short_name_allocated)
 633                 free((char *)dso->short_name);
 634
 635         dso->short_name           = name;
 636         dso->short_name_len       = strlen(name);
 637         dso->short_name_allocated = name_allocated;
 638 }
 639
 640 static void dso__set_basename(struct dso *dso)
 641 {
 642        /*
 643         * basename() may modify path buffer, so we must pass
 644         * a copy.
 645         */
 646        char *base, *lname = strdup(dso->long_name);
 647
 648        if (!lname)
 649                return;
 650
 651        /*
 652         * basename() may return a pointer to internal
 653         * storage which is reused in subsequent calls
 654         * so copy the result.
 655         */
 656        base = strdup(basename(lname));
 657
 658        free(lname);
 659
 660        if (!base)
 661                return;
 662
 663        dso__set_short_name(dso, base, true);
 664 }
 665
 666 int dso__name_len(const struct dso *dso)
 667 {
 668         if (!dso)
 669                 return strlen("[unknown]");
 670         if (verbose)
 671                 return dso->long_name_len;
 672
 673         return dso->short_name_len;
 674 }
 675
 676 bool dso__loaded(const struct dso *dso, enum map_type type)
 677 {
 678         return dso->loaded & (1 << type);
 679 }
 680
 681 bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
 682 {
 683         return dso->sorted_by_name & (1 << type);
 684 }
 685
 686 void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
 687 {
 688         dso->sorted_by_name |= (1 << type);
 689 }
 690
 691 struct dso *dso__new(const char *name)
 692 {
 693         struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
 694
 695         if (dso != NULL) {
 696                 int i;
 697                 strcpy(dso->name, name);
 698                 dso__set_long_name(dso, dso->name, false);
 699                 dso__set_short_name(dso, dso->name, false);
 700                 for (i = 0; i < MAP__NR_TYPES; ++i)
 701                         dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
 702                 dso->data.cache = RB_ROOT;
 703                 dso->data.fd = -1;
 704                 dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
 705                 dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND;
 706                 dso->loaded = 0;
 707                 dso->rel = 0;
 708                 dso->sorted_by_name = 0;
 709                 dso->has_build_id = 0;
 710                 dso->has_srcline = 1;
 711                 dso->a2l_fails = 1;
 712                 dso->kernel = DSO_TYPE_USER;
 713                 dso->needs_swap = DSO_SWAP__UNSET;
 714                 INIT_LIST_HEAD(&dso->node);
 715                 INIT_LIST_HEAD(&dso->data.open_entry);
 716         }
 717
 718         return dso;
 719 }
 720
 721 void dso__delete(struct dso *dso)
 722 {
 723         int i;
 724         for (i = 0; i < MAP__NR_TYPES; ++i)
 725                 symbols__delete(&dso->symbols[i]);
 726
 727         if (dso->short_name_allocated) {
 728                 zfree((char **)&dso->short_name);
 729                 dso->short_name_allocated = false;
 730         }
 731
 732         if (dso->long_name_allocated) {
 733                 zfree((char **)&dso->long_name);
 734                 dso->long_name_allocated = false;
 735         }
 736
 737         dso__data_close(dso);
 738         dso_cache__free(&dso->data.cache);
 739         dso__free_a2l(dso);
 740         zfree(&dso->symsrc_filename);
 741         free(dso);
 742 }
 743
 744 void dso__set_build_id(struct dso *dso, void *build_id)
 745 {
 746         memcpy(dso->build_id, build_id, sizeof(dso->build_id));
 747         dso->has_build_id = 1;
 748 }
 749
 750 bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
 751 {
 752         return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
 753 }
 754
 755 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
 756 {
 757         char path[PATH_MAX];
 758
 759         if (machine__is_default_guest(machine))
 760                 return;
 761         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
 762         if (sysfs__read_build_id(path, dso->build_id,
 763                                  sizeof(dso->build_id)) == 0)
 764                 dso->has_build_id = true;
 765 }
 766
 767 int dso__kernel_module_get_build_id(struct dso *dso,
 768                                     const char *root_dir)
 769 {
 770         char filename[PATH_MAX];
 771         /*
 772          * kernel module short names are of the form "[module]" and
 773          * we need just "module" here.
 774          */
 775         const char *name = dso->short_name + 1;
 776
 777         snprintf(filename, sizeof(filename),
 778                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
 779                  root_dir, (int)strlen(name) - 1, name);
 780
 781         if (sysfs__read_build_id(filename, dso->build_id,
 782                                  sizeof(dso->build_id)) == 0)
 783                 dso->has_build_id = true;
 784
 785         return 0;
 786 }
 787
 788 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
 789 {
 790         bool have_build_id = false;
 791         struct dso *pos;
 792
 793         list_for_each_entry(pos, head, node) {
 794                 if (with_hits && !pos->hit)
 795                         continue;
 796                 if (pos->has_build_id) {
 797                         have_build_id = true;
 798                         continue;
 799                 }
 800                 if (filename__read_build_id(pos->long_name, pos->build_id,
 801                                             sizeof(pos->build_id)) > 0) {
 802                         have_build_id     = true;
 803                         pos->has_build_id = true;
 804                 }
 805         }
 806
 807         return have_build_id;
 808 }
 809
 810 void dsos__add(struct list_head *head, struct dso *dso)
 811 {
 812         list_add_tail(&dso->node, head);
 813 }
 814
 815 struct dso *dsos__find(const struct list_head *head, const char *name, bool cmp_short)
 816 {
 817         struct dso *pos;
 818
 819         if (cmp_short) {
 820                 list_for_each_entry(pos, head, node)
 821                         if (strcmp(pos->short_name, name) == 0)
 822                                 return pos;
 823                 return NULL;
 824         }
 825         list_for_each_entry(pos, head, node)
 826                 if (strcmp(pos->long_name, name) == 0)
 827                         return pos;
 828         return NULL;
 829 }
 830
 831 struct dso *__dsos__findnew(struct list_head *head, const char *name)
 832 {
 833         struct dso *dso = dsos__find(head, name, false);
 834
 835         if (!dso) {
 836                 dso = dso__new(name);
 837                 if (dso != NULL) {
 838                         dsos__add(head, dso);
 839                         dso__set_basename(dso);
 840                 }
 841         }
 842
 843         return dso;
 844 }
 845
 846 size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
 847                                bool (skip)(struct dso *dso, int parm), int parm)
 848 {
 849         struct dso *pos;
 850         size_t ret = 0;
 851
 852         list_for_each_entry(pos, head, node) {
 853                 if (skip && skip(pos, parm))
 854                         continue;
 855                 ret += dso__fprintf_buildid(pos, fp);
 856                 ret += fprintf(fp, " %s\n", pos->long_name);
 857         }
 858         return ret;
 859 }
 860
 861 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
 862 {
 863         struct dso *pos;
 864         size_t ret = 0;
 865
 866         list_for_each_entry(pos, head, node) {
 867                 int i;
 868                 for (i = 0; i < MAP__NR_TYPES; ++i)
 869                         ret += dso__fprintf(pos, i, fp);
 870         }
 871
 872         return ret;
 873 }
 874
 875 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
 876 {
 877         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 878
 879         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
 880         return fprintf(fp, "%s", sbuild_id);
 881 }
 882
 883 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
 884 {
 885         struct rb_node *nd;
 886         size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
 887
 888         if (dso->short_name != dso->long_name)
 889                 ret += fprintf(fp, "%s, ", dso->long_name);
 890         ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
 891                        dso__loaded(dso, type) ? "" : "NOT ");
 892         ret += dso__fprintf_buildid(dso, fp);
 893         ret += fprintf(fp, ")\n");
 894         for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
 895                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 896                 ret += symbol__fprintf(pos, fp);
 897         }
 898
 899         return ret;
 900 }