1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 /* Copyright (c) 2018 Facebook */ 3 4 #ifndef __LIBBPF_BTF_H 5 #define __LIBBPF_BTF_H 6 7 #include <linux/types.h> 8 9 #ifdef __cplusplus 10 extern "C" { 11 #endif 12 13 #ifndef LIBBPF_API 14 #define LIBBPF_API __attribute__((visibility("default"))) 15 #endif 16 17 #define BTF_ELF_SEC ".BTF" 18 #define BTF_EXT_ELF_SEC ".BTF.ext" 19 20 struct btf; 21 struct btf_ext; 22 struct btf_type; 23 24 struct bpf_object; 25 26 /* 27 * The .BTF.ext ELF section layout defined as 28 * struct btf_ext_header 29 * func_info subsection 30 * 31 * The func_info subsection layout: 32 * record size for struct bpf_func_info in the func_info subsection 33 * struct btf_sec_func_info for section #1 34 * a list of bpf_func_info records for section #1 35 * where struct bpf_func_info mimics one in include/uapi/linux/bpf.h 36 * but may not be identical 37 * struct btf_sec_func_info for section #2 38 * a list of bpf_func_info records for section #2 39 * ...... 40 * 41 * Note that the bpf_func_info record size in .BTF.ext may not 42 * be the same as the one defined in include/uapi/linux/bpf.h. 43 * The loader should ensure that record_size meets minimum 44 * requirement and pass the record as is to the kernel. The 45 * kernel will handle the func_info properly based on its contents. 46 */ 47 struct btf_ext_header { 48 __u16 magic; 49 __u8 version; 50 __u8 flags; 51 __u32 hdr_len; 52 53 /* All offsets are in bytes relative to the end of this header */ 54 __u32 func_info_off; 55 __u32 func_info_len; 56 __u32 line_info_off; 57 __u32 line_info_len; 58 }; 59 60 LIBBPF_API void btf__free(struct btf *btf); 61 LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size); 62 LIBBPF_API int btf__finalize_data(struct bpf_object *obj, struct btf *btf); 63 LIBBPF_API int btf__load(struct btf *btf); 64 LIBBPF_API __s32 btf__find_by_name(const struct btf *btf, 65 const char *type_name); 66 LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf); 67 LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf, 68 __u32 id); 69 LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id); 70 LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id); 71 LIBBPF_API int btf__fd(const struct btf *btf); 72 LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size); 73 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset); 74 LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf); 75 LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name, 76 __u32 expected_key_size, 77 __u32 expected_value_size, 78 __u32 *key_type_id, __u32 *value_type_id); 79 80 LIBBPF_API struct btf_ext *btf_ext__new(__u8 *data, __u32 size); 81 LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext); 82 LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, 83 __u32 *size); 84 LIBBPF_API int btf_ext__reloc_func_info(const struct btf *btf, 85 const struct btf_ext *btf_ext, 86 const char *sec_name, __u32 insns_cnt, 87 void **func_info, __u32 *cnt); 88 LIBBPF_API int btf_ext__reloc_line_info(const struct btf *btf, 89 const struct btf_ext *btf_ext, 90 const char *sec_name, __u32 insns_cnt, 91 void **line_info, __u32 *cnt); 92 LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext); 93 LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext); 94 95 struct btf_dedup_opts { 96 unsigned int dedup_table_size; 97 bool dont_resolve_fwds; 98 }; 99 100 LIBBPF_API int btf__dedup(struct btf *btf, struct btf_ext *btf_ext, 101 const struct btf_dedup_opts *opts); 102 103 #ifdef __cplusplus 104 } /* extern "C" */ 105 #endif 106 107 #endif /* __LIBBPF_BTF_H */ 108