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Commit b8dcf8d1 authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

tools/bpf: expose functions btf_ext__* as API functions 



The following set of functions, which manipulates .BTF.ext
section, are exposed as API functions:
  . btf_ext__new
  . btf_ext__free
  . btf_ext__reloc_func_info
  . btf_ext__reloc_line_info
  . btf_ext__func_info_rec_size
  . btf_ext__line_info_rec_size

These functions are useful for JIT based bpf codegen, e.g.,
bcc, to manipulate in-memory .BTF.ext sections.

The signature of function btf_ext__reloc_func_info()
is also changed to be the same as its definition in btf.c.

Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 7e8a5903

tools/lib/bpf/btf.h

+12 −12
Original line number Diff line number Diff line
@@ -67,18 +67,18 @@ LIBBPF_API int btf__fd(const struct btf *btf); 
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);



struct btf_ext *btf_ext__new(__u8 *data, __u32 size);

void btf_ext__free(struct btf_ext *btf_ext);

int btf_ext__reloc_func_info(const struct btf *btf,

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 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 *func_info_len);

int btf_ext__reloc_line_info(const struct btf *btf,

					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);

__u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);

__u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);

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);



#ifdef __cplusplus

} /* extern "C" */

tools/lib/bpf/libbpf.map

+6 −0
Original line number Diff line number Diff line
@@ -133,4 +133,10 @@ LIBBPF_0.0.2 { 
		bpf_map_lookup_elem_flags;

		bpf_object__find_map_fd_by_name;

		bpf_get_link_xdp_id;

		btf_ext__free;

		btf_ext__func_info_rec_size;

		btf_ext__line_info_rec_size;

		btf_ext__new;

		btf_ext__reloc_func_info;

		btf_ext__reloc_line_info;

} LIBBPF_0.0.1;