1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
2 /* Copyright (c) 2018 Facebook */
7 #include <linux/types.h>
14 #define LIBBPF_API __attribute__((visibility("default")))
17 #define BTF_ELF_SEC ".BTF"
18 #define BTF_EXT_ELF_SEC ".BTF.ext"
27 * The .BTF.ext ELF section layout defined as
28 * struct btf_ext_header
29 * func_info subsection
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
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.
47 struct btf_ext_header {
53 /* All offsets are in bytes relative to the end of this header */
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,
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);
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,
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);
95 struct btf_dedup_opts {
96 unsigned int dedup_table_size;
97 bool dont_resolve_fwds;
100 LIBBPF_API int btf__dedup(struct btf *btf, struct btf_ext *btf_ext,
101 const struct btf_dedup_opts *opts);
107 #endif /* __LIBBPF_BTF_H */