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bpf: libbpf: Add btf_line_info support to libbpf

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This patch adds bpf_line_info support to libbpf:
1) Parsing the line_info sec from ".BTF.ext"
2) Relocating the line_info.  If the main prog *_info relocation
   fails, it will ignore the remaining subprog line_info and continue.
   If the subprog *_info relocation fails, it will bail out.
3) BPF_PROG_LOAD a prog with line_info

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2018-12-07 16:42:31 -08:00 • committed by Alexei Starovoitov
parent f0187f0b17
commit 3d65014146
5 changed files with 238 additions and 88 deletions
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20
tools/lib/bpf/libbpf.c
View file

@ -170,6 +170,10 @@ struct bpf_program {
__u32 func_info_cnt;
struct bpf_capabilities *caps;
void *line_info;
__u32 line_info_rec_size;
__u32 line_info_cnt;
};
struct bpf_map {
@ -1342,6 +1346,19 @@ bpf_program_reloc_btf_ext(struct bpf_program *prog, struct bpf_object *obj,
prog->func_info_rec_size = btf_ext__func_info_rec_size(obj->btf_ext);
}
if (!insn_offset || prog->line_info) {
err = btf_ext__reloc_line_info(obj->btf, obj->btf_ext,
section_name, insn_offset,
&prog->line_info,
&prog->line_info_cnt);
if (err)
return check_btf_ext_reloc_err(prog, err,
prog->line_info,
"bpf_line_info");
prog->line_info_rec_size = btf_ext__line_info_rec_size(obj->btf_ext);
}
if (!insn_offset)
prog->btf_fd = btf__fd(obj->btf);
@ -1526,6 +1543,9 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
load_attr.func_info = prog->func_info;
load_attr.func_info_rec_size = prog->func_info_rec_size;
load_attr.func_info_cnt = prog->func_info_cnt;
load_attr.line_info = prog->line_info;
load_attr.line_info_rec_size = prog->line_info_rec_size;
load_attr.line_info_cnt = prog->line_info_cnt;
if (!load_attr.insns || !load_attr.insns_cnt)
return -EINVAL;