tools/bpf/resolve_btfids/main.c

   1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2
   3 /*
   4  * resolve_btfids scans Elf object for .BTF_ids section and resolves
   5  * its symbols with BTF ID values.
   6  *
   7  * Each symbol points to 4 bytes data and is expected to have
   8  * following name syntax:
   9  *
  10  * __BTF_ID__<type>__<symbol>[__<id>]
  11  *
  12  * type is:
  13  *
  14  *   func    - lookup BTF_KIND_FUNC symbol with <symbol> name
  15  *             and store its ID into the data:
  16  *
  17  *             __BTF_ID__func__vfs_close__1:
  18  *             .zero 4
  19  *
  20  *   struct  - lookup BTF_KIND_STRUCT symbol with <symbol> name
  21  *             and store its ID into the data:
  22  *
  23  *             __BTF_ID__struct__sk_buff__1:
  24  *             .zero 4
  25  *
  26  *   union   - lookup BTF_KIND_UNION symbol with <symbol> name
  27  *             and store its ID into the data:
  28  *
  29  *             __BTF_ID__union__thread_union__1:
  30  *             .zero 4
  31  *
  32  *   typedef - lookup BTF_KIND_TYPEDEF symbol with <symbol> name
  33  *             and store its ID into the data:
  34  *
  35  *             __BTF_ID__typedef__pid_t__1:
  36  *             .zero 4
  37  *
  38  *   set     - store symbol size into first 4 bytes and sort following
  39  *             ID list
  40  *
  41  *             __BTF_ID__set__list:
  42  *             .zero 4
  43  *             list:
  44  *             __BTF_ID__func__vfs_getattr__3:
  45  *             .zero 4
  46  *             __BTF_ID__func__vfs_fallocate__4:
  47  *             .zero 4
  48  */
  49
  50 #define  _GNU_SOURCE
  51 #include <stdio.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <stdlib.h>
  55 #include <libelf.h>
  56 #include <gelf.h>
  57 #include <sys/stat.h>
  58 #include <fcntl.h>
  59 #include <errno.h>
  60 #include <linux/rbtree.h>
  61 #include <linux/zalloc.h>
  62 #include <linux/err.h>
  63 #include <bpf/btf.h>
  64 #include <bpf/libbpf.h>
  65 #include <parse-options.h>
  66
  67 #define BTF_IDS_SECTION ".BTF_ids"
  68 #define BTF_ID          "__BTF_ID__"
  69
  70 #define BTF_STRUCT      "struct"
  71 #define BTF_UNION       "union"
  72 #define BTF_TYPEDEF     "typedef"
  73 #define BTF_FUNC        "func"
  74 #define BTF_SET         "set"
  75
  76 #define ADDR_CNT        100
  77
  78 struct btf_id {
  79         struct rb_node   rb_node;
  80         char            *name;
  81         union {
  82                 int      id;
  83                 int      cnt;
  84         };
  85         int              addr_cnt;
  86         bool             is_set;
  87         Elf64_Addr       addr[ADDR_CNT];
  88 };
  89
  90 struct object {
  91         const char *path;
  92         const char *btf;
  93         const char *base_btf_path;
  94
  95         struct {
  96                 int              fd;
  97                 Elf             *elf;
  98                 Elf_Data        *symbols;
  99                 Elf_Data        *idlist;
 100                 int              symbols_shndx;
 101                 int              idlist_shndx;
 102                 size_t           strtabidx;
 103                 unsigned long    idlist_addr;
 104         } efile;
 105
 106         struct rb_root  sets;
 107         struct rb_root  structs;
 108         struct rb_root  unions;
 109         struct rb_root  typedefs;
 110         struct rb_root  funcs;
 111
 112         int nr_funcs;
 113         int nr_structs;
 114         int nr_unions;
 115         int nr_typedefs;
 116 };
 117
 118 static int verbose;
 119
 120 static int eprintf(int level, int var, const char *fmt, ...)
 121 {
 122         va_list args;
 123         int ret = 0;
 124
 125         if (var >= level) {
 126                 va_start(args, fmt);
 127                 ret = vfprintf(stderr, fmt, args);
 128                 va_end(args);
 129         }
 130         return ret;
 131 }
 132
 133 #ifndef pr_fmt
 134 #define pr_fmt(fmt) fmt
 135 #endif
 136
 137 #define pr_debug(fmt, ...) \
 138         eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__)
 139 #define pr_debugN(n, fmt, ...) \
 140         eprintf(n, verbose, pr_fmt(fmt), ##__VA_ARGS__)
 141 #define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
 142 #define pr_err(fmt, ...) \
 143         eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
 144 #define pr_info(fmt, ...) \
 145         eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
 146
 147 static bool is_btf_id(const char *name)
 148 {
 149         return name && !strncmp(name, BTF_ID, sizeof(BTF_ID) - 1);
 150 }
 151
 152 static struct btf_id *btf_id__find(struct rb_root *root, const char *name)
 153 {
 154         struct rb_node *p = root->rb_node;
 155         struct btf_id *id;
 156         int cmp;
 157
 158         while (p) {
 159                 id = rb_entry(p, struct btf_id, rb_node);
 160                 cmp = strcmp(id->name, name);
 161                 if (cmp < 0)
 162                         p = p->rb_left;
 163                 else if (cmp > 0)
 164                         p = p->rb_right;
 165                 else
 166                         return id;
 167         }
 168         return NULL;
 169 }
 170
 171 static struct btf_id *
 172 btf_id__add(struct rb_root *root, char *name, bool unique)
 173 {
 174         struct rb_node **p = &root->rb_node;
 175         struct rb_node *parent = NULL;
 176         struct btf_id *id;
 177         int cmp;
 178
 179         while (*p != NULL) {
 180                 parent = *p;
 181                 id = rb_entry(parent, struct btf_id, rb_node);
 182                 cmp = strcmp(id->name, name);
 183                 if (cmp < 0)
 184                         p = &(*p)->rb_left;
 185                 else if (cmp > 0)
 186                         p = &(*p)->rb_right;
 187                 else
 188                         return unique ? NULL : id;
 189         }
 190
 191         id = zalloc(sizeof(*id));
 192         if (id) {
 193                 pr_debug("adding symbol %s\n", name);
 194                 id->name = name;
 195                 rb_link_node(&id->rb_node, parent, p);
 196                 rb_insert_color(&id->rb_node, root);
 197         }
 198         return id;
 199 }
 200
 201 static char *get_id(const char *prefix_end)
 202 {
 203         /*
 204          * __BTF_ID__func__vfs_truncate__0
 205          * prefix_end =  ^
 206          * pos        =    ^
 207          */
 208         int len = strlen(prefix_end);
 209         int pos = sizeof("__") - 1;
 210         char *p, *id;
 211
 212         if (pos >= len)
 213                 return NULL;
 214
 215         id = strdup(prefix_end + pos);
 216         if (id) {
 217                 /*
 218                  * __BTF_ID__func__vfs_truncate__0
 219                  * id =            ^
 220                  *
 221                  * cut the unique id part
 222                  */
 223                 p = strrchr(id, '_');
 224                 p--;
 225                 if (*p != '_') {
 226                         free(id);
 227                         return NULL;
 228                 }
 229                 *p = '\0';
 230         }
 231         return id;
 232 }
 233
 234 static struct btf_id *add_set(struct object *obj, char *name)
 235 {
 236         /*
 237          * __BTF_ID__set__name
 238          * name =    ^
 239          * id   =         ^
 240          */
 241         char *id = name + sizeof(BTF_SET "__") - 1;
 242         int len = strlen(name);
 243
 244         if (id >= name + len) {
 245                 pr_err("FAILED to parse set name: %s\n", name);
 246                 return NULL;
 247         }
 248
 249         return btf_id__add(&obj->sets, id, true);
 250 }
 251
 252 static struct btf_id *add_symbol(struct rb_root *root, char *name, size_t size)
 253 {
 254         char *id;
 255
 256         id = get_id(name + size);
 257         if (!id) {
 258                 pr_err("FAILED to parse symbol name: %s\n", name);
 259                 return NULL;
 260         }
 261
 262         return btf_id__add(root, id, false);
 263 }
 264
 265 /* Older libelf.h and glibc elf.h might not yet define the ELF compression types. */
 266 #ifndef SHF_COMPRESSED
 267 #define SHF_COMPRESSED (1 << 11) /* Section with compressed data. */
 268 #endif
 269
 270 /*
 271  * The data of compressed section should be aligned to 4
 272  * (for 32bit) or 8 (for 64 bit) bytes. The binutils ld
 273  * sets sh_addralign to 1, which makes libelf fail with
 274  * misaligned section error during the update:
 275  *    FAILED elf_update(WRITE): invalid section alignment
 276  *
 277  * While waiting for ld fix, we fix the compressed sections
 278  * sh_addralign value manualy.
 279  */
 280 static int compressed_section_fix(Elf *elf, Elf_Scn *scn, GElf_Shdr *sh)
 281 {
 282         int expected = gelf_getclass(elf) == ELFCLASS32 ? 4 : 8;
 283
 284         if (!(sh->sh_flags & SHF_COMPRESSED))
 285                 return 0;
 286
 287         if (sh->sh_addralign == expected)
 288                 return 0;
 289
 290         pr_debug2(" - fixing wrong alignment sh_addralign %u, expected %u\n",
 291                   sh->sh_addralign, expected);
 292
 293         sh->sh_addralign = expected;
 294
 295         if (gelf_update_shdr(scn, sh) == 0) {
 296                 pr_err("FAILED cannot update section header: %s\n",
 297                         elf_errmsg(-1));
 298                 return -1;
 299         }
 300         return 0;
 301 }
 302
 303 static int elf_collect(struct object *obj)
 304 {
 305         Elf_Scn *scn = NULL;
 306         size_t shdrstrndx;
 307         int idx = 0;
 308         Elf *elf;
 309         int fd;
 310
 311         fd = open(obj->path, O_RDWR, 0666);
 312         if (fd == -1) {
 313                 pr_err("FAILED cannot open %s: %s\n",
 314                         obj->path, strerror(errno));
 315                 return -1;
 316         }
 317
 318         elf_version(EV_CURRENT);
 319
 320         elf = elf_begin(fd, ELF_C_RDWR_MMAP, NULL);
 321         if (!elf) {
 322                 close(fd);
 323                 pr_err("FAILED cannot create ELF descriptor: %s\n",
 324                         elf_errmsg(-1));
 325                 return -1;
 326         }
 327
 328         obj->efile.fd  = fd;
 329         obj->efile.elf = elf;
 330
 331         elf_flagelf(elf, ELF_C_SET, ELF_F_LAYOUT);
 332
 333         if (elf_getshdrstrndx(elf, &shdrstrndx) != 0) {
 334                 pr_err("FAILED cannot get shdr str ndx\n");
 335                 return -1;
 336         }
 337
 338         /*
 339          * Scan all the elf sections and look for save data
 340          * from .BTF_ids section and symbols.
 341          */
 342         while ((scn = elf_nextscn(elf, scn)) != NULL) {
 343                 Elf_Data *data;
 344                 GElf_Shdr sh;
 345                 char *name;
 346
 347                 idx++;
 348                 if (gelf_getshdr(scn, &sh) != &sh) {
 349                         pr_err("FAILED get section(%d) header\n", idx);
 350                         return -1;
 351                 }
 352
 353                 name = elf_strptr(elf, shdrstrndx, sh.sh_name);
 354                 if (!name) {
 355                         pr_err("FAILED get section(%d) name\n", idx);
 356                         return -1;
 357                 }
 358
 359                 data = elf_getdata(scn, 0);
 360                 if (!data) {
 361                         pr_err("FAILED to get section(%d) data from %s\n",
 362                                 idx, name);
 363                         return -1;
 364                 }
 365
 366                 pr_debug2("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
 367                           idx, name, (unsigned long) data->d_size,
 368                           (int) sh.sh_link, (unsigned long) sh.sh_flags,
 369                           (int) sh.sh_type);
 370
 371                 if (sh.sh_type == SHT_SYMTAB) {
 372                         obj->efile.symbols       = data;
 373                         obj->efile.symbols_shndx = idx;
 374                         obj->efile.strtabidx     = sh.sh_link;
 375                 } else if (!strcmp(name, BTF_IDS_SECTION)) {
 376                         obj->efile.idlist       = data;
 377                         obj->efile.idlist_shndx = idx;
 378                         obj->efile.idlist_addr  = sh.sh_addr;
 379                 }
 380
 381                 if (compressed_section_fix(elf, scn, &sh))
 382                         return -1;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static int symbols_collect(struct object *obj)
 389 {
 390         Elf_Scn *scn = NULL;
 391         int n, i;
 392         GElf_Shdr sh;
 393         char *name;
 394
 395         scn = elf_getscn(obj->efile.elf, obj->efile.symbols_shndx);
 396         if (!scn)
 397                 return -1;
 398
 399         if (gelf_getshdr(scn, &sh) != &sh)
 400                 return -1;
 401
 402         n = sh.sh_size / sh.sh_entsize;
 403
 404         /*
 405          * Scan symbols and look for the ones starting with
 406          * __BTF_ID__* over .BTF_ids section.
 407          */
 408         for (i = 0; i < n; i++) {
 409                 char *prefix;
 410                 struct btf_id *id;
 411                 GElf_Sym sym;
 412
 413                 if (!gelf_getsym(obj->efile.symbols, i, &sym))
 414                         return -1;
 415
 416                 if (sym.st_shndx != obj->efile.idlist_shndx)
 417                         continue;
 418
 419                 name = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
 420                                   sym.st_name);
 421
 422                 if (!is_btf_id(name))
 423                         continue;
 424
 425                 /*
 426                  * __BTF_ID__TYPE__vfs_truncate__0
 427                  * prefix =  ^
 428                  */
 429                 prefix = name + sizeof(BTF_ID) - 1;
 430
 431                 /* struct */
 432                 if (!strncmp(prefix, BTF_STRUCT, sizeof(BTF_STRUCT) - 1)) {
 433                         obj->nr_structs++;
 434                         id = add_symbol(&obj->structs, prefix, sizeof(BTF_STRUCT) - 1);
 435                 /* union  */
 436                 } else if (!strncmp(prefix, BTF_UNION, sizeof(BTF_UNION) - 1)) {
 437                         obj->nr_unions++;
 438                         id = add_symbol(&obj->unions, prefix, sizeof(BTF_UNION) - 1);
 439                 /* typedef */
 440                 } else if (!strncmp(prefix, BTF_TYPEDEF, sizeof(BTF_TYPEDEF) - 1)) {
 441                         obj->nr_typedefs++;
 442                         id = add_symbol(&obj->typedefs, prefix, sizeof(BTF_TYPEDEF) - 1);
 443                 /* func */
 444                 } else if (!strncmp(prefix, BTF_FUNC, sizeof(BTF_FUNC) - 1)) {
 445                         obj->nr_funcs++;
 446                         id = add_symbol(&obj->funcs, prefix, sizeof(BTF_FUNC) - 1);
 447                 /* set */
 448                 } else if (!strncmp(prefix, BTF_SET, sizeof(BTF_SET) - 1)) {
 449                         id = add_set(obj, prefix);
 450                         /*
 451                          * SET objects store list's count, which is encoded
 452                          * in symbol's size, together with 'cnt' field hence
 453                          * that - 1.
 454                          */
 455                         if (id) {
 456                                 id->cnt = sym.st_size / sizeof(int) - 1;
 457                                 id->is_set = true;
 458                         }
 459                 } else {
 460                         pr_err("FAILED unsupported prefix %s\n", prefix);
 461                         return -1;
 462                 }
 463
 464                 if (!id)
 465                         return -ENOMEM;
 466
 467                 if (id->addr_cnt >= ADDR_CNT) {
 468                         pr_err("FAILED symbol %s crossed the number of allowed lists\n",
 469                                 id->name);
 470                         return -1;
 471                 }
 472                 id->addr[id->addr_cnt++] = sym.st_value;
 473         }
 474
 475         return 0;
 476 }
 477
 478 static int symbols_resolve(struct object *obj)
 479 {
 480         int nr_typedefs = obj->nr_typedefs;
 481         int nr_structs  = obj->nr_structs;
 482         int nr_unions   = obj->nr_unions;
 483         int nr_funcs    = obj->nr_funcs;
 484         struct btf *base_btf = NULL;
 485         int err, type_id;
 486         struct btf *btf;
 487         __u32 nr_types;
 488
 489         if (obj->base_btf_path) {
 490                 base_btf = btf__parse(obj->base_btf_path, NULL);
 491                 err = libbpf_get_error(base_btf);
 492                 if (err) {
 493                         pr_err("FAILED: load base BTF from %s: %s\n",
 494                                obj->base_btf_path, strerror(-err));
 495                         return -1;
 496                 }
 497         }
 498
 499         btf = btf__parse_split(obj->btf ?: obj->path, base_btf);
 500         err = libbpf_get_error(btf);
 501         if (err) {
 502                 pr_err("FAILED: load BTF from %s: %s\n",
 503                         obj->btf ?: obj->path, strerror(-err));
 504                 goto out;
 505         }
 506
 507         err = -1;
 508         nr_types = btf__type_cnt(btf);
 509
 510         /*
 511          * Iterate all the BTF types and search for collected symbol IDs.
 512          */
 513         for (type_id = 1; type_id < nr_types; type_id++) {
 514                 const struct btf_type *type;
 515                 struct rb_root *root;
 516                 struct btf_id *id;
 517                 const char *str;
 518                 int *nr;
 519
 520                 type = btf__type_by_id(btf, type_id);
 521                 if (!type) {
 522                         pr_err("FAILED: malformed BTF, can't resolve type for ID %d\n",
 523                                 type_id);
 524                         goto out;
 525                 }
 526
 527                 if (btf_is_func(type) && nr_funcs) {
 528                         nr   = &nr_funcs;
 529                         root = &obj->funcs;
 530                 } else if (btf_is_struct(type) && nr_structs) {
 531                         nr   = &nr_structs;
 532                         root = &obj->structs;
 533                 } else if (btf_is_union(type) && nr_unions) {
 534                         nr   = &nr_unions;
 535                         root = &obj->unions;
 536                 } else if (btf_is_typedef(type) && nr_typedefs) {
 537                         nr   = &nr_typedefs;
 538                         root = &obj->typedefs;
 539                 } else
 540                         continue;
 541
 542                 str = btf__name_by_offset(btf, type->name_off);
 543                 if (!str) {
 544                         pr_err("FAILED: malformed BTF, can't resolve name for ID %d\n",
 545                                 type_id);
 546                         goto out;
 547                 }
 548
 549                 id = btf_id__find(root, str);
 550                 if (id) {
 551                         if (id->id) {
 552                                 pr_info("WARN: multiple IDs found for '%s': %d, %d - using %d\n",
 553                                         str, id->id, type_id, id->id);
 554                         } else {
 555                                 id->id = type_id;
 556                                 (*nr)--;
 557                         }
 558                 }
 559         }
 560
 561         err = 0;
 562 out:
 563         btf__free(base_btf);
 564         btf__free(btf);
 565         return err;
 566 }
 567
 568 static int id_patch(struct object *obj, struct btf_id *id)
 569 {
 570         Elf_Data *data = obj->efile.idlist;
 571         int *ptr = data->d_buf;
 572         int i;
 573
 574         if (!id->id && !id->is_set)
 575                 pr_err("WARN: resolve_btfids: unresolved symbol %s\n", id->name);
 576
 577         for (i = 0; i < id->addr_cnt; i++) {
 578                 unsigned long addr = id->addr[i];
 579                 unsigned long idx = addr - obj->efile.idlist_addr;
 580
 581                 pr_debug("patching addr %5lu: ID %7d [%s]\n",
 582                          idx, id->id, id->name);
 583
 584                 if (idx >= data->d_size) {
 585                         pr_err("FAILED patching index %lu out of bounds %lu\n",
 586                                 idx, data->d_size);
 587                         return -1;
 588                 }
 589
 590                 idx = idx / sizeof(int);
 591                 ptr[idx] = id->id;
 592         }
 593
 594         return 0;
 595 }
 596
 597 static int __symbols_patch(struct object *obj, struct rb_root *root)
 598 {
 599         struct rb_node *next;
 600         struct btf_id *id;
 601
 602         next = rb_first(root);
 603         while (next) {
 604                 id = rb_entry(next, struct btf_id, rb_node);
 605
 606                 if (id_patch(obj, id))
 607                         return -1;
 608
 609                 next = rb_next(next);
 610         }
 611         return 0;
 612 }
 613
 614 static int cmp_id(const void *pa, const void *pb)
 615 {
 616         const int *a = pa, *b = pb;
 617
 618         return *a - *b;
 619 }
 620
 621 static int sets_patch(struct object *obj)
 622 {
 623         Elf_Data *data = obj->efile.idlist;
 624         int *ptr = data->d_buf;
 625         struct rb_node *next;
 626
 627         next = rb_first(&obj->sets);
 628         while (next) {
 629                 unsigned long addr, idx;
 630                 struct btf_id *id;
 631                 int *base;
 632                 int cnt;
 633
 634                 id   = rb_entry(next, struct btf_id, rb_node);
 635                 addr = id->addr[0];
 636                 idx  = addr - obj->efile.idlist_addr;
 637
 638                 /* sets are unique */
 639                 if (id->addr_cnt != 1) {
 640                         pr_err("FAILED malformed data for set '%s'\n",
 641                                 id->name);
 642                         return -1;
 643                 }
 644
 645                 idx = idx / sizeof(int);
 646                 base = &ptr[idx] + 1;
 647                 cnt = ptr[idx];
 648
 649                 pr_debug("sorting  addr %5lu: cnt %6d [%s]\n",
 650                          (idx + 1) * sizeof(int), cnt, id->name);
 651
 652                 qsort(base, cnt, sizeof(int), cmp_id);
 653
 654                 next = rb_next(next);
 655         }
 656         return 0;
 657 }
 658
 659 static int symbols_patch(struct object *obj)
 660 {
 661         int err;
 662
 663         if (__symbols_patch(obj, &obj->structs)  ||
 664             __symbols_patch(obj, &obj->unions)   ||
 665             __symbols_patch(obj, &obj->typedefs) ||
 666             __symbols_patch(obj, &obj->funcs)    ||
 667             __symbols_patch(obj, &obj->sets))
 668                 return -1;
 669
 670         if (sets_patch(obj))
 671                 return -1;
 672
 673         /* Set type to ensure endian translation occurs. */
 674         obj->efile.idlist->d_type = ELF_T_WORD;
 675
 676         elf_flagdata(obj->efile.idlist, ELF_C_SET, ELF_F_DIRTY);
 677
 678         err = elf_update(obj->efile.elf, ELF_C_WRITE);
 679         if (err < 0) {
 680                 pr_err("FAILED elf_update(WRITE): %s\n",
 681                         elf_errmsg(-1));
 682         }
 683
 684         pr_debug("update %s for %s\n",
 685                  err >= 0 ? "ok" : "failed", obj->path);
 686         return err < 0 ? -1 : 0;
 687 }
 688
 689 static const char * const resolve_btfids_usage[] = {
 690         "resolve_btfids [<options>] <ELF object>",
 691         NULL
 692 };
 693
 694 int main(int argc, const char **argv)
 695 {
 696         struct object obj = {
 697                 .efile = {
 698                         .idlist_shndx  = -1,
 699                         .symbols_shndx = -1,
 700                 },
 701                 .structs  = RB_ROOT,
 702                 .unions   = RB_ROOT,
 703                 .typedefs = RB_ROOT,
 704                 .funcs    = RB_ROOT,
 705                 .sets     = RB_ROOT,
 706         };
 707         struct option btfid_options[] = {
 708                 OPT_INCR('v', "verbose", &verbose,
 709                          "be more verbose (show errors, etc)"),
 710                 OPT_STRING(0, "btf", &obj.btf, "BTF data",
 711                            "BTF data"),
 712                 OPT_STRING('b', "btf_base", &obj.base_btf_path, "file",
 713                            "path of file providing base BTF"),
 714                 OPT_END()
 715         };
 716         int err = -1;
 717
 718         argc = parse_options(argc, argv, btfid_options, resolve_btfids_usage,
 719                              PARSE_OPT_STOP_AT_NON_OPTION);
 720         if (argc != 1)
 721                 usage_with_options(resolve_btfids_usage, btfid_options);
 722
 723         obj.path = argv[0];
 724
 725         if (elf_collect(&obj))
 726                 goto out;
 727
 728         /*
 729          * We did not find .BTF_ids section or symbols section,
 730          * nothing to do..
 731          */
 732         if (obj.efile.idlist_shndx == -1 ||
 733             obj.efile.symbols_shndx == -1) {
 734                 pr_debug("Cannot find .BTF_ids or symbols sections, nothing to do\n");
 735                 err = 0;
 736                 goto out;
 737         }
 738
 739         if (symbols_collect(&obj))
 740                 goto out;
 741
 742         if (symbols_resolve(&obj))
 743                 goto out;
 744
 745         if (symbols_patch(&obj))
 746                 goto out;
 747
 748         err = 0;
 749 out:
 750         if (obj.efile.elf) {
 751                 elf_end(obj.efile.elf);
 752                 close(obj.efile.fd);
 753         }
 754         return err;
 755 }