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0001 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
0002 
0003 /*
0004  * resolve_btfids scans Elf object for .BTF_ids section and resolves
0005  * its symbols with BTF ID values.
0006  *
0007  * Each symbol points to 4 bytes data and is expected to have
0008  * following name syntax:
0009  *
0010  * __BTF_ID__<type>__<symbol>[__<id>]
0011  *
0012  * type is:
0013  *
0014  *   func    - lookup BTF_KIND_FUNC symbol with <symbol> name
0015  *             and store its ID into the data:
0016  *
0017  *             __BTF_ID__func__vfs_close__1:
0018  *             .zero 4
0019  *
0020  *   struct  - lookup BTF_KIND_STRUCT symbol with <symbol> name
0021  *             and store its ID into the data:
0022  *
0023  *             __BTF_ID__struct__sk_buff__1:
0024  *             .zero 4
0025  *
0026  *   union   - lookup BTF_KIND_UNION symbol with <symbol> name
0027  *             and store its ID into the data:
0028  *
0029  *             __BTF_ID__union__thread_union__1:
0030  *             .zero 4
0031  *
0032  *   typedef - lookup BTF_KIND_TYPEDEF symbol with <symbol> name
0033  *             and store its ID into the data:
0034  *
0035  *             __BTF_ID__typedef__pid_t__1:
0036  *             .zero 4
0037  *
0038  *   set     - store symbol size into first 4 bytes and sort following
0039  *             ID list
0040  *
0041  *             __BTF_ID__set__list:
0042  *             .zero 4
0043  *             list:
0044  *             __BTF_ID__func__vfs_getattr__3:
0045  *             .zero 4
0046  *             __BTF_ID__func__vfs_fallocate__4:
0047  *             .zero 4
0048  *
0049  *   set8    - store symbol size into first 4 bytes and sort following
0050  *             ID list
0051  *
0052  *             __BTF_ID__set8__list:
0053  *             .zero 8
0054  *             list:
0055  *             __BTF_ID__func__vfs_getattr__3:
0056  *             .zero 4
0057  *         .word (1 << 0) | (1 << 2)
0058  *             __BTF_ID__func__vfs_fallocate__5:
0059  *             .zero 4
0060  *         .word (1 << 3) | (1 << 1) | (1 << 2)
0061  */
0062 
0063 #define  _GNU_SOURCE
0064 #include <stdio.h>
0065 #include <string.h>
0066 #include <unistd.h>
0067 #include <stdlib.h>
0068 #include <libelf.h>
0069 #include <gelf.h>
0070 #include <sys/stat.h>
0071 #include <fcntl.h>
0072 #include <errno.h>
0073 #include <linux/rbtree.h>
0074 #include <linux/zalloc.h>
0075 #include <linux/err.h>
0076 #include <bpf/btf.h>
0077 #include <bpf/libbpf.h>
0078 #include <parse-options.h>
0079 
0080 #define BTF_IDS_SECTION ".BTF_ids"
0081 #define BTF_ID      "__BTF_ID__"
0082 
0083 #define BTF_STRUCT  "struct"
0084 #define BTF_UNION   "union"
0085 #define BTF_TYPEDEF "typedef"
0086 #define BTF_FUNC    "func"
0087 #define BTF_SET     "set"
0088 #define BTF_SET8    "set8"
0089 
0090 #define ADDR_CNT    100
0091 
0092 struct btf_id {
0093     struct rb_node   rb_node;
0094     char        *name;
0095     union {
0096         int  id;
0097         int  cnt;
0098     };
0099     int      addr_cnt;
0100     bool         is_set;
0101     bool         is_set8;
0102     Elf64_Addr   addr[ADDR_CNT];
0103 };
0104 
0105 struct object {
0106     const char *path;
0107     const char *btf;
0108     const char *base_btf_path;
0109 
0110     struct {
0111         int      fd;
0112         Elf     *elf;
0113         Elf_Data    *symbols;
0114         Elf_Data    *idlist;
0115         int      symbols_shndx;
0116         int      idlist_shndx;
0117         size_t       strtabidx;
0118         unsigned long    idlist_addr;
0119     } efile;
0120 
0121     struct rb_root  sets;
0122     struct rb_root  structs;
0123     struct rb_root  unions;
0124     struct rb_root  typedefs;
0125     struct rb_root  funcs;
0126 
0127     int nr_funcs;
0128     int nr_structs;
0129     int nr_unions;
0130     int nr_typedefs;
0131 };
0132 
0133 static int verbose;
0134 
0135 static int eprintf(int level, int var, const char *fmt, ...)
0136 {
0137     va_list args;
0138     int ret = 0;
0139 
0140     if (var >= level) {
0141         va_start(args, fmt);
0142         ret = vfprintf(stderr, fmt, args);
0143         va_end(args);
0144     }
0145     return ret;
0146 }
0147 
0148 #ifndef pr_fmt
0149 #define pr_fmt(fmt) fmt
0150 #endif
0151 
0152 #define pr_debug(fmt, ...) \
0153     eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__)
0154 #define pr_debugN(n, fmt, ...) \
0155     eprintf(n, verbose, pr_fmt(fmt), ##__VA_ARGS__)
0156 #define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
0157 #define pr_err(fmt, ...) \
0158     eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
0159 #define pr_info(fmt, ...) \
0160     eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
0161 
0162 static bool is_btf_id(const char *name)
0163 {
0164     return name && !strncmp(name, BTF_ID, sizeof(BTF_ID) - 1);
0165 }
0166 
0167 static struct btf_id *btf_id__find(struct rb_root *root, const char *name)
0168 {
0169     struct rb_node *p = root->rb_node;
0170     struct btf_id *id;
0171     int cmp;
0172 
0173     while (p) {
0174         id = rb_entry(p, struct btf_id, rb_node);
0175         cmp = strcmp(id->name, name);
0176         if (cmp < 0)
0177             p = p->rb_left;
0178         else if (cmp > 0)
0179             p = p->rb_right;
0180         else
0181             return id;
0182     }
0183     return NULL;
0184 }
0185 
0186 static struct btf_id *
0187 btf_id__add(struct rb_root *root, char *name, bool unique)
0188 {
0189     struct rb_node **p = &root->rb_node;
0190     struct rb_node *parent = NULL;
0191     struct btf_id *id;
0192     int cmp;
0193 
0194     while (*p != NULL) {
0195         parent = *p;
0196         id = rb_entry(parent, struct btf_id, rb_node);
0197         cmp = strcmp(id->name, name);
0198         if (cmp < 0)
0199             p = &(*p)->rb_left;
0200         else if (cmp > 0)
0201             p = &(*p)->rb_right;
0202         else
0203             return unique ? NULL : id;
0204     }
0205 
0206     id = zalloc(sizeof(*id));
0207     if (id) {
0208         pr_debug("adding symbol %s\n", name);
0209         id->name = name;
0210         rb_link_node(&id->rb_node, parent, p);
0211         rb_insert_color(&id->rb_node, root);
0212     }
0213     return id;
0214 }
0215 
0216 static char *get_id(const char *prefix_end)
0217 {
0218     /*
0219      * __BTF_ID__func__vfs_truncate__0
0220      * prefix_end =  ^
0221      * pos        =    ^
0222      */
0223     int len = strlen(prefix_end);
0224     int pos = sizeof("__") - 1;
0225     char *p, *id;
0226 
0227     if (pos >= len)
0228         return NULL;
0229 
0230     id = strdup(prefix_end + pos);
0231     if (id) {
0232         /*
0233          * __BTF_ID__func__vfs_truncate__0
0234          * id =            ^
0235          *
0236          * cut the unique id part
0237          */
0238         p = strrchr(id, '_');
0239         p--;
0240         if (*p != '_') {
0241             free(id);
0242             return NULL;
0243         }
0244         *p = '\0';
0245     }
0246     return id;
0247 }
0248 
0249 static struct btf_id *add_set(struct object *obj, char *name, bool is_set8)
0250 {
0251     /*
0252      * __BTF_ID__set__name
0253      * name =    ^
0254      * id   =         ^
0255      */
0256     char *id = name + (is_set8 ? sizeof(BTF_SET8 "__") : sizeof(BTF_SET "__")) - 1;
0257     int len = strlen(name);
0258 
0259     if (id >= name + len) {
0260         pr_err("FAILED to parse set name: %s\n", name);
0261         return NULL;
0262     }
0263 
0264     return btf_id__add(&obj->sets, id, true);
0265 }
0266 
0267 static struct btf_id *add_symbol(struct rb_root *root, char *name, size_t size)
0268 {
0269     char *id;
0270 
0271     id = get_id(name + size);
0272     if (!id) {
0273         pr_err("FAILED to parse symbol name: %s\n", name);
0274         return NULL;
0275     }
0276 
0277     return btf_id__add(root, id, false);
0278 }
0279 
0280 /* Older libelf.h and glibc elf.h might not yet define the ELF compression types. */
0281 #ifndef SHF_COMPRESSED
0282 #define SHF_COMPRESSED (1 << 11) /* Section with compressed data. */
0283 #endif
0284 
0285 /*
0286  * The data of compressed section should be aligned to 4
0287  * (for 32bit) or 8 (for 64 bit) bytes. The binutils ld
0288  * sets sh_addralign to 1, which makes libelf fail with
0289  * misaligned section error during the update:
0290  *    FAILED elf_update(WRITE): invalid section alignment
0291  *
0292  * While waiting for ld fix, we fix the compressed sections
0293  * sh_addralign value manualy.
0294  */
0295 static int compressed_section_fix(Elf *elf, Elf_Scn *scn, GElf_Shdr *sh)
0296 {
0297     int expected = gelf_getclass(elf) == ELFCLASS32 ? 4 : 8;
0298 
0299     if (!(sh->sh_flags & SHF_COMPRESSED))
0300         return 0;
0301 
0302     if (sh->sh_addralign == expected)
0303         return 0;
0304 
0305     pr_debug2(" - fixing wrong alignment sh_addralign %u, expected %u\n",
0306           sh->sh_addralign, expected);
0307 
0308     sh->sh_addralign = expected;
0309 
0310     if (gelf_update_shdr(scn, sh) == 0) {
0311         pr_err("FAILED cannot update section header: %s\n",
0312             elf_errmsg(-1));
0313         return -1;
0314     }
0315     return 0;
0316 }
0317 
0318 static int elf_collect(struct object *obj)
0319 {
0320     Elf_Scn *scn = NULL;
0321     size_t shdrstrndx;
0322     int idx = 0;
0323     Elf *elf;
0324     int fd;
0325 
0326     fd = open(obj->path, O_RDWR, 0666);
0327     if (fd == -1) {
0328         pr_err("FAILED cannot open %s: %s\n",
0329             obj->path, strerror(errno));
0330         return -1;
0331     }
0332 
0333     elf_version(EV_CURRENT);
0334 
0335     elf = elf_begin(fd, ELF_C_RDWR_MMAP, NULL);
0336     if (!elf) {
0337         close(fd);
0338         pr_err("FAILED cannot create ELF descriptor: %s\n",
0339             elf_errmsg(-1));
0340         return -1;
0341     }
0342 
0343     obj->efile.fd  = fd;
0344     obj->efile.elf = elf;
0345 
0346     elf_flagelf(elf, ELF_C_SET, ELF_F_LAYOUT);
0347 
0348     if (elf_getshdrstrndx(elf, &shdrstrndx) != 0) {
0349         pr_err("FAILED cannot get shdr str ndx\n");
0350         return -1;
0351     }
0352 
0353     /*
0354      * Scan all the elf sections and look for save data
0355      * from .BTF_ids section and symbols.
0356      */
0357     while ((scn = elf_nextscn(elf, scn)) != NULL) {
0358         Elf_Data *data;
0359         GElf_Shdr sh;
0360         char *name;
0361 
0362         idx++;
0363         if (gelf_getshdr(scn, &sh) != &sh) {
0364             pr_err("FAILED get section(%d) header\n", idx);
0365             return -1;
0366         }
0367 
0368         name = elf_strptr(elf, shdrstrndx, sh.sh_name);
0369         if (!name) {
0370             pr_err("FAILED get section(%d) name\n", idx);
0371             return -1;
0372         }
0373 
0374         data = elf_getdata(scn, 0);
0375         if (!data) {
0376             pr_err("FAILED to get section(%d) data from %s\n",
0377                 idx, name);
0378             return -1;
0379         }
0380 
0381         pr_debug2("section(%d) %s, size %ld, link %d, flags %lx, type=%d\n",
0382               idx, name, (unsigned long) data->d_size,
0383               (int) sh.sh_link, (unsigned long) sh.sh_flags,
0384               (int) sh.sh_type);
0385 
0386         if (sh.sh_type == SHT_SYMTAB) {
0387             obj->efile.symbols       = data;
0388             obj->efile.symbols_shndx = idx;
0389             obj->efile.strtabidx     = sh.sh_link;
0390         } else if (!strcmp(name, BTF_IDS_SECTION)) {
0391             obj->efile.idlist       = data;
0392             obj->efile.idlist_shndx = idx;
0393             obj->efile.idlist_addr  = sh.sh_addr;
0394         }
0395 
0396         if (compressed_section_fix(elf, scn, &sh))
0397             return -1;
0398     }
0399 
0400     return 0;
0401 }
0402 
0403 static int symbols_collect(struct object *obj)
0404 {
0405     Elf_Scn *scn = NULL;
0406     int n, i;
0407     GElf_Shdr sh;
0408     char *name;
0409 
0410     scn = elf_getscn(obj->efile.elf, obj->efile.symbols_shndx);
0411     if (!scn)
0412         return -1;
0413 
0414     if (gelf_getshdr(scn, &sh) != &sh)
0415         return -1;
0416 
0417     n = sh.sh_size / sh.sh_entsize;
0418 
0419     /*
0420      * Scan symbols and look for the ones starting with
0421      * __BTF_ID__* over .BTF_ids section.
0422      */
0423     for (i = 0; i < n; i++) {
0424         char *prefix;
0425         struct btf_id *id;
0426         GElf_Sym sym;
0427 
0428         if (!gelf_getsym(obj->efile.symbols, i, &sym))
0429             return -1;
0430 
0431         if (sym.st_shndx != obj->efile.idlist_shndx)
0432             continue;
0433 
0434         name = elf_strptr(obj->efile.elf, obj->efile.strtabidx,
0435                   sym.st_name);
0436 
0437         if (!is_btf_id(name))
0438             continue;
0439 
0440         /*
0441          * __BTF_ID__TYPE__vfs_truncate__0
0442          * prefix =  ^
0443          */
0444         prefix = name + sizeof(BTF_ID) - 1;
0445 
0446         /* struct */
0447         if (!strncmp(prefix, BTF_STRUCT, sizeof(BTF_STRUCT) - 1)) {
0448             obj->nr_structs++;
0449             id = add_symbol(&obj->structs, prefix, sizeof(BTF_STRUCT) - 1);
0450         /* union  */
0451         } else if (!strncmp(prefix, BTF_UNION, sizeof(BTF_UNION) - 1)) {
0452             obj->nr_unions++;
0453             id = add_symbol(&obj->unions, prefix, sizeof(BTF_UNION) - 1);
0454         /* typedef */
0455         } else if (!strncmp(prefix, BTF_TYPEDEF, sizeof(BTF_TYPEDEF) - 1)) {
0456             obj->nr_typedefs++;
0457             id = add_symbol(&obj->typedefs, prefix, sizeof(BTF_TYPEDEF) - 1);
0458         /* func */
0459         } else if (!strncmp(prefix, BTF_FUNC, sizeof(BTF_FUNC) - 1)) {
0460             obj->nr_funcs++;
0461             id = add_symbol(&obj->funcs, prefix, sizeof(BTF_FUNC) - 1);
0462         /* set8 */
0463         } else if (!strncmp(prefix, BTF_SET8, sizeof(BTF_SET8) - 1)) {
0464             id = add_set(obj, prefix, true);
0465             /*
0466              * SET8 objects store list's count, which is encoded
0467              * in symbol's size, together with 'cnt' field hence
0468              * that - 1.
0469              */
0470             if (id) {
0471                 id->cnt = sym.st_size / sizeof(uint64_t) - 1;
0472                 id->is_set8 = true;
0473             }
0474         /* set */
0475         } else if (!strncmp(prefix, BTF_SET, sizeof(BTF_SET) - 1)) {
0476             id = add_set(obj, prefix, false);
0477             /*
0478              * SET objects store list's count, which is encoded
0479              * in symbol's size, together with 'cnt' field hence
0480              * that - 1.
0481              */
0482             if (id) {
0483                 id->cnt = sym.st_size / sizeof(int) - 1;
0484                 id->is_set = true;
0485             }
0486         } else {
0487             pr_err("FAILED unsupported prefix %s\n", prefix);
0488             return -1;
0489         }
0490 
0491         if (!id)
0492             return -ENOMEM;
0493 
0494         if (id->addr_cnt >= ADDR_CNT) {
0495             pr_err("FAILED symbol %s crossed the number of allowed lists\n",
0496                 id->name);
0497             return -1;
0498         }
0499         id->addr[id->addr_cnt++] = sym.st_value;
0500     }
0501 
0502     return 0;
0503 }
0504 
0505 static int symbols_resolve(struct object *obj)
0506 {
0507     int nr_typedefs = obj->nr_typedefs;
0508     int nr_structs  = obj->nr_structs;
0509     int nr_unions   = obj->nr_unions;
0510     int nr_funcs    = obj->nr_funcs;
0511     struct btf *base_btf = NULL;
0512     int err, type_id;
0513     struct btf *btf;
0514     __u32 nr_types;
0515 
0516     if (obj->base_btf_path) {
0517         base_btf = btf__parse(obj->base_btf_path, NULL);
0518         err = libbpf_get_error(base_btf);
0519         if (err) {
0520             pr_err("FAILED: load base BTF from %s: %s\n",
0521                    obj->base_btf_path, strerror(-err));
0522             return -1;
0523         }
0524     }
0525 
0526     btf = btf__parse_split(obj->btf ?: obj->path, base_btf);
0527     err = libbpf_get_error(btf);
0528     if (err) {
0529         pr_err("FAILED: load BTF from %s: %s\n",
0530             obj->btf ?: obj->path, strerror(-err));
0531         goto out;
0532     }
0533 
0534     err = -1;
0535     nr_types = btf__type_cnt(btf);
0536 
0537     /*
0538      * Iterate all the BTF types and search for collected symbol IDs.
0539      */
0540     for (type_id = 1; type_id < nr_types; type_id++) {
0541         const struct btf_type *type;
0542         struct rb_root *root;
0543         struct btf_id *id;
0544         const char *str;
0545         int *nr;
0546 
0547         type = btf__type_by_id(btf, type_id);
0548         if (!type) {
0549             pr_err("FAILED: malformed BTF, can't resolve type for ID %d\n",
0550                 type_id);
0551             goto out;
0552         }
0553 
0554         if (btf_is_func(type) && nr_funcs) {
0555             nr   = &nr_funcs;
0556             root = &obj->funcs;
0557         } else if (btf_is_struct(type) && nr_structs) {
0558             nr   = &nr_structs;
0559             root = &obj->structs;
0560         } else if (btf_is_union(type) && nr_unions) {
0561             nr   = &nr_unions;
0562             root = &obj->unions;
0563         } else if (btf_is_typedef(type) && nr_typedefs) {
0564             nr   = &nr_typedefs;
0565             root = &obj->typedefs;
0566         } else
0567             continue;
0568 
0569         str = btf__name_by_offset(btf, type->name_off);
0570         if (!str) {
0571             pr_err("FAILED: malformed BTF, can't resolve name for ID %d\n",
0572                 type_id);
0573             goto out;
0574         }
0575 
0576         id = btf_id__find(root, str);
0577         if (id) {
0578             if (id->id) {
0579                 pr_info("WARN: multiple IDs found for '%s': %d, %d - using %d\n",
0580                     str, id->id, type_id, id->id);
0581             } else {
0582                 id->id = type_id;
0583                 (*nr)--;
0584             }
0585         }
0586     }
0587 
0588     err = 0;
0589 out:
0590     btf__free(base_btf);
0591     btf__free(btf);
0592     return err;
0593 }
0594 
0595 static int id_patch(struct object *obj, struct btf_id *id)
0596 {
0597     Elf_Data *data = obj->efile.idlist;
0598     int *ptr = data->d_buf;
0599     int i;
0600 
0601     /* For set, set8, id->id may be 0 */
0602     if (!id->id && !id->is_set && !id->is_set8)
0603         pr_err("WARN: resolve_btfids: unresolved symbol %s\n", id->name);
0604 
0605     for (i = 0; i < id->addr_cnt; i++) {
0606         unsigned long addr = id->addr[i];
0607         unsigned long idx = addr - obj->efile.idlist_addr;
0608 
0609         pr_debug("patching addr %5lu: ID %7d [%s]\n",
0610              idx, id->id, id->name);
0611 
0612         if (idx >= data->d_size) {
0613             pr_err("FAILED patching index %lu out of bounds %lu\n",
0614                 idx, data->d_size);
0615             return -1;
0616         }
0617 
0618         idx = idx / sizeof(int);
0619         ptr[idx] = id->id;
0620     }
0621 
0622     return 0;
0623 }
0624 
0625 static int __symbols_patch(struct object *obj, struct rb_root *root)
0626 {
0627     struct rb_node *next;
0628     struct btf_id *id;
0629 
0630     next = rb_first(root);
0631     while (next) {
0632         id = rb_entry(next, struct btf_id, rb_node);
0633 
0634         if (id_patch(obj, id))
0635             return -1;
0636 
0637         next = rb_next(next);
0638     }
0639     return 0;
0640 }
0641 
0642 static int cmp_id(const void *pa, const void *pb)
0643 {
0644     const int *a = pa, *b = pb;
0645 
0646     return *a - *b;
0647 }
0648 
0649 static int sets_patch(struct object *obj)
0650 {
0651     Elf_Data *data = obj->efile.idlist;
0652     int *ptr = data->d_buf;
0653     struct rb_node *next;
0654 
0655     next = rb_first(&obj->sets);
0656     while (next) {
0657         unsigned long addr, idx;
0658         struct btf_id *id;
0659         int *base;
0660         int cnt;
0661 
0662         id   = rb_entry(next, struct btf_id, rb_node);
0663         addr = id->addr[0];
0664         idx  = addr - obj->efile.idlist_addr;
0665 
0666         /* sets are unique */
0667         if (id->addr_cnt != 1) {
0668             pr_err("FAILED malformed data for set '%s'\n",
0669                 id->name);
0670             return -1;
0671         }
0672 
0673         idx = idx / sizeof(int);
0674         base = &ptr[idx] + (id->is_set8 ? 2 : 1);
0675         cnt = ptr[idx];
0676 
0677         pr_debug("sorting  addr %5lu: cnt %6d [%s]\n",
0678              (idx + 1) * sizeof(int), cnt, id->name);
0679 
0680         qsort(base, cnt, id->is_set8 ? sizeof(uint64_t) : sizeof(int), cmp_id);
0681 
0682         next = rb_next(next);
0683     }
0684     return 0;
0685 }
0686 
0687 static int symbols_patch(struct object *obj)
0688 {
0689     int err;
0690 
0691     if (__symbols_patch(obj, &obj->structs)  ||
0692         __symbols_patch(obj, &obj->unions)   ||
0693         __symbols_patch(obj, &obj->typedefs) ||
0694         __symbols_patch(obj, &obj->funcs)    ||
0695         __symbols_patch(obj, &obj->sets))
0696         return -1;
0697 
0698     if (sets_patch(obj))
0699         return -1;
0700 
0701     /* Set type to ensure endian translation occurs. */
0702     obj->efile.idlist->d_type = ELF_T_WORD;
0703 
0704     elf_flagdata(obj->efile.idlist, ELF_C_SET, ELF_F_DIRTY);
0705 
0706     err = elf_update(obj->efile.elf, ELF_C_WRITE);
0707     if (err < 0) {
0708         pr_err("FAILED elf_update(WRITE): %s\n",
0709             elf_errmsg(-1));
0710     }
0711 
0712     pr_debug("update %s for %s\n",
0713          err >= 0 ? "ok" : "failed", obj->path);
0714     return err < 0 ? -1 : 0;
0715 }
0716 
0717 static const char * const resolve_btfids_usage[] = {
0718     "resolve_btfids [<options>] <ELF object>",
0719     NULL
0720 };
0721 
0722 int main(int argc, const char **argv)
0723 {
0724     struct object obj = {
0725         .efile = {
0726             .idlist_shndx  = -1,
0727             .symbols_shndx = -1,
0728         },
0729         .structs  = RB_ROOT,
0730         .unions   = RB_ROOT,
0731         .typedefs = RB_ROOT,
0732         .funcs    = RB_ROOT,
0733         .sets     = RB_ROOT,
0734     };
0735     struct option btfid_options[] = {
0736         OPT_INCR('v', "verbose", &verbose,
0737              "be more verbose (show errors, etc)"),
0738         OPT_STRING(0, "btf", &obj.btf, "BTF data",
0739                "BTF data"),
0740         OPT_STRING('b', "btf_base", &obj.base_btf_path, "file",
0741                "path of file providing base BTF"),
0742         OPT_END()
0743     };
0744     int err = -1;
0745 
0746     argc = parse_options(argc, argv, btfid_options, resolve_btfids_usage,
0747                  PARSE_OPT_STOP_AT_NON_OPTION);
0748     if (argc != 1)
0749         usage_with_options(resolve_btfids_usage, btfid_options);
0750 
0751     obj.path = argv[0];
0752 
0753     if (elf_collect(&obj))
0754         goto out;
0755 
0756     /*
0757      * We did not find .BTF_ids section or symbols section,
0758      * nothing to do..
0759      */
0760     if (obj.efile.idlist_shndx == -1 ||
0761         obj.efile.symbols_shndx == -1) {
0762         pr_debug("Cannot find .BTF_ids or symbols sections, nothing to do\n");
0763         err = 0;
0764         goto out;
0765     }
0766 
0767     if (symbols_collect(&obj))
0768         goto out;
0769 
0770     if (symbols_resolve(&obj))
0771         goto out;
0772 
0773     if (symbols_patch(&obj))
0774         goto out;
0775 
0776     err = 0;
0777 out:
0778     if (obj.efile.elf) {
0779         elf_end(obj.efile.elf);
0780         close(obj.efile.fd);
0781     }
0782     return err;
0783 }
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