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bpf: btf: support proper non-jit func info

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Commit 838e96904f ("bpf: Introduce bpf_func_info")
added bpf func info support. The userspace is able
to get better ksym's for bpf programs with jit, and
is able to print out func prototypes.

For a program containing func-to-func calls, the existing
implementation returns user specified number of function
calls and BTF types if jit is enabled. If the jit is not
enabled, it only returns the type for the main function.

This is undesirable. Interpreter may still be used
and we should keep feature identical regardless of
whether jit is enabled or not.
This patch fixed this discrepancy.

Fixes: 838e96904f ("bpf: Introduce bpf_func_info")
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2018-11-24 23:20:44 -08:00
committed by Alexei Starovoitov
parent d8f3e978bd
commit ba64e7d852
5 changed files with 52 additions and 46 deletions
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3
kernel/bpf/core.c
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@@ -411,7 +411,8 @@ static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
/* prog->aux->name will be ignored if full btf name is available */
if (prog->aux->btf) {
type = btf_type_by_id(prog->aux->btf, prog->aux->type_id);
type = btf_type_by_id(prog->aux->btf,
prog->aux->func_info[prog->aux->func_idx].type_id);
func_name = btf_name_by_offset(prog->aux->btf, type->name_off);
snprintf(sym, (size_t)(end - sym), "_%s", func_name);
return;