btf: expose API to work with raw btf data

This patch exposes new API btf__get_raw_data() that allows to get a copy
of raw BTF data out of struct btf. This is useful for external programs
that need to manipulate raw data, e.g., pahole using btf__dedup() to
deduplicate BTF type info and then writing it back to file.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 46db0a3b5cb7..4fba0aa989df 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -439,6 +439,12 @@ int btf__fd(const struct btf *btf)
         return btf->fd;
 }
 
+const void *btf__get_raw_data(const struct btf *btf, __u32 *size)
+{
+        *size = btf->data_size;
+        return btf->data;
+}
+
 void btf__get_strings(const struct btf *btf, const char **strings,
                       __u32 *str_len)
 {