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