| /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
| /* Copyright (c) 2018 Facebook */ |
| |
| #ifndef __LIBBPF_BTF_H |
| #define __LIBBPF_BTF_H |
| |
| #include <stdarg.h> |
| #include <linux/btf.h> |
| #include <linux/types.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef LIBBPF_API |
| #define LIBBPF_API __attribute__((visibility("default"))) |
| #endif |
| |
| #define BTF_ELF_SEC ".BTF" |
| #define BTF_EXT_ELF_SEC ".BTF.ext" |
| #define MAPS_ELF_SEC ".maps" |
| |
| struct btf; |
| struct btf_ext; |
| struct btf_type; |
| |
| struct bpf_object; |
| |
| /* |
| * The .BTF.ext ELF section layout defined as |
| * struct btf_ext_header |
| * func_info subsection |
| * |
| * The func_info subsection layout: |
| * record size for struct bpf_func_info in the func_info subsection |
| * struct btf_sec_func_info for section #1 |
| * a list of bpf_func_info records for section #1 |
| * where struct bpf_func_info mimics one in include/uapi/linux/bpf.h |
| * but may not be identical |
| * struct btf_sec_func_info for section #2 |
| * a list of bpf_func_info records for section #2 |
| * ...... |
| * |
| * Note that the bpf_func_info record size in .BTF.ext may not |
| * be the same as the one defined in include/uapi/linux/bpf.h. |
| * The loader should ensure that record_size meets minimum |
| * requirement and pass the record as is to the kernel. The |
| * kernel will handle the func_info properly based on its contents. |
| */ |
| struct btf_ext_header { |
| __u16 magic; |
| __u8 version; |
| __u8 flags; |
| __u32 hdr_len; |
| |
| /* All offsets are in bytes relative to the end of this header */ |
| __u32 func_info_off; |
| __u32 func_info_len; |
| __u32 line_info_off; |
| __u32 line_info_len; |
| |
| /* optional part of .BTF.ext header */ |
| __u32 offset_reloc_off; |
| __u32 offset_reloc_len; |
| }; |
| |
| LIBBPF_API void btf__free(struct btf *btf); |
| LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size); |
| LIBBPF_API struct btf *btf__parse_elf(const char *path, |
| struct btf_ext **btf_ext); |
| LIBBPF_API int btf__finalize_data(struct bpf_object *obj, struct btf *btf); |
| LIBBPF_API int btf__load(struct btf *btf); |
| LIBBPF_API __s32 btf__find_by_name(const struct btf *btf, |
| const char *type_name); |
| LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf); |
| LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf, |
| __u32 id); |
| LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id); |
| LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id); |
| LIBBPF_API int btf__fd(const struct btf *btf); |
| LIBBPF_API const void *btf__get_raw_data(const struct btf *btf, __u32 *size); |
| LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset); |
| LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf); |
| LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name, |
| __u32 expected_key_size, |
| __u32 expected_value_size, |
| __u32 *key_type_id, __u32 *value_type_id); |
| |
| LIBBPF_API struct btf_ext *btf_ext__new(__u8 *data, __u32 size); |
| LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext); |
| LIBBPF_API const void *btf_ext__get_raw_data(const struct btf_ext *btf_ext, |
| __u32 *size); |
| LIBBPF_API int btf_ext__reloc_func_info(const struct btf *btf, |
| const struct btf_ext *btf_ext, |
| const char *sec_name, __u32 insns_cnt, |
| void **func_info, __u32 *cnt); |
| LIBBPF_API int btf_ext__reloc_line_info(const struct btf *btf, |
| const struct btf_ext *btf_ext, |
| const char *sec_name, __u32 insns_cnt, |
| void **line_info, __u32 *cnt); |
| LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext); |
| LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext); |
| |
| struct btf_dedup_opts { |
| unsigned int dedup_table_size; |
| bool dont_resolve_fwds; |
| }; |
| |
| LIBBPF_API int btf__dedup(struct btf *btf, struct btf_ext *btf_ext, |
| const struct btf_dedup_opts *opts); |
| |
| struct btf_dump; |
| |
| struct btf_dump_opts { |
| void *ctx; |
| }; |
| |
| typedef void (*btf_dump_printf_fn_t)(void *ctx, const char *fmt, va_list args); |
| |
| LIBBPF_API struct btf_dump *btf_dump__new(const struct btf *btf, |
| const struct btf_ext *btf_ext, |
| const struct btf_dump_opts *opts, |
| btf_dump_printf_fn_t printf_fn); |
| LIBBPF_API void btf_dump__free(struct btf_dump *d); |
| |
| LIBBPF_API int btf_dump__dump_type(struct btf_dump *d, __u32 id); |
| |
| /* |
| * A set of helpers for easier BTF types handling |
| */ |
| static inline __u16 btf_kind(const struct btf_type *t) |
| { |
| return BTF_INFO_KIND(t->info); |
| } |
| |
| static inline __u16 btf_vlen(const struct btf_type *t) |
| { |
| return BTF_INFO_VLEN(t->info); |
| } |
| |
| static inline bool btf_kflag(const struct btf_type *t) |
| { |
| return BTF_INFO_KFLAG(t->info); |
| } |
| |
| static inline bool btf_is_int(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_INT; |
| } |
| |
| static inline bool btf_is_ptr(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_PTR; |
| } |
| |
| static inline bool btf_is_array(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_ARRAY; |
| } |
| |
| static inline bool btf_is_struct(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_STRUCT; |
| } |
| |
| static inline bool btf_is_union(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_UNION; |
| } |
| |
| static inline bool btf_is_composite(const struct btf_type *t) |
| { |
| __u16 kind = btf_kind(t); |
| |
| return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION; |
| } |
| |
| static inline bool btf_is_enum(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_ENUM; |
| } |
| |
| static inline bool btf_is_fwd(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_FWD; |
| } |
| |
| static inline bool btf_is_typedef(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_TYPEDEF; |
| } |
| |
| static inline bool btf_is_volatile(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_VOLATILE; |
| } |
| |
| static inline bool btf_is_const(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_CONST; |
| } |
| |
| static inline bool btf_is_restrict(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_RESTRICT; |
| } |
| |
| static inline bool btf_is_mod(const struct btf_type *t) |
| { |
| __u16 kind = btf_kind(t); |
| |
| return kind == BTF_KIND_VOLATILE || |
| kind == BTF_KIND_CONST || |
| kind == BTF_KIND_RESTRICT; |
| } |
| |
| static inline bool btf_is_func(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_FUNC; |
| } |
| |
| static inline bool btf_is_func_proto(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_FUNC_PROTO; |
| } |
| |
| static inline bool btf_is_var(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_VAR; |
| } |
| |
| static inline bool btf_is_datasec(const struct btf_type *t) |
| { |
| return btf_kind(t) == BTF_KIND_DATASEC; |
| } |
| |
| static inline __u8 btf_int_encoding(const struct btf_type *t) |
| { |
| return BTF_INT_ENCODING(*(__u32 *)(t + 1)); |
| } |
| |
| static inline __u8 btf_int_offset(const struct btf_type *t) |
| { |
| return BTF_INT_OFFSET(*(__u32 *)(t + 1)); |
| } |
| |
| static inline __u8 btf_int_bits(const struct btf_type *t) |
| { |
| return BTF_INT_BITS(*(__u32 *)(t + 1)); |
| } |
| |
| static inline struct btf_array *btf_array(const struct btf_type *t) |
| { |
| return (struct btf_array *)(t + 1); |
| } |
| |
| static inline struct btf_enum *btf_enum(const struct btf_type *t) |
| { |
| return (struct btf_enum *)(t + 1); |
| } |
| |
| static inline struct btf_member *btf_members(const struct btf_type *t) |
| { |
| return (struct btf_member *)(t + 1); |
| } |
| |
| /* Get bit offset of a member with specified index. */ |
| static inline __u32 btf_member_bit_offset(const struct btf_type *t, |
| __u32 member_idx) |
| { |
| const struct btf_member *m = btf_members(t) + member_idx; |
| bool kflag = btf_kflag(t); |
| |
| return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset; |
| } |
| /* |
| * Get bitfield size of a member, assuming t is BTF_KIND_STRUCT or |
| * BTF_KIND_UNION. If member is not a bitfield, zero is returned. |
| */ |
| static inline __u32 btf_member_bitfield_size(const struct btf_type *t, |
| __u32 member_idx) |
| { |
| const struct btf_member *m = btf_members(t) + member_idx; |
| bool kflag = btf_kflag(t); |
| |
| return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0; |
| } |
| |
| static inline struct btf_param *btf_params(const struct btf_type *t) |
| { |
| return (struct btf_param *)(t + 1); |
| } |
| |
| static inline struct btf_var *btf_var(const struct btf_type *t) |
| { |
| return (struct btf_var *)(t + 1); |
| } |
| |
| static inline struct btf_var_secinfo * |
| btf_var_secinfos(const struct btf_type *t) |
| { |
| return (struct btf_var_secinfo *)(t + 1); |
| } |
| |
| #ifdef __cplusplus |
| } /* extern "C" */ |
| #endif |
| |
| #endif /* __LIBBPF_BTF_H */ |