From: Andrii Nakryiko <andriin@fb.com>
Date: Sat, 1 Aug 2020 18:32:18 -0700
Subject: tools/bpftool: Use libbpf's btf__parse() API for parsing BTF from
 file
Patch-mainline: v5.9-rc1
Git-commit: 8526df04570f5698c97ac661ad1f2f35293557a7
References: bsc#1177028

Use generic libbpf API to parse BTF data from file, instead of re-implementing
it in bpftool.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200802013219.864880-3-andriin@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
 tools/bpf/bpftool/btf.c |   54 ------------------------------------------------
 1 file changed, 1 insertion(+), 53 deletions(-)

--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -422,54 +422,6 @@ done:
 	return err;
 }
 
-static struct btf *btf__parse_raw(const char *file)
-{
-	struct btf *btf;
-	struct stat st;
-	__u8 *buf;
-	FILE *f;
-
-	if (stat(file, &st))
-		return NULL;
-
-	f = fopen(file, "rb");
-	if (!f)
-		return NULL;
-
-	buf = malloc(st.st_size);
-	if (!buf) {
-		btf = ERR_PTR(-ENOMEM);
-		goto exit_close;
-	}
-
-	if ((size_t) st.st_size != fread(buf, 1, st.st_size, f)) {
-		btf = ERR_PTR(-EINVAL);
-		goto exit_free;
-	}
-
-	btf = btf__new(buf, st.st_size);
-
-exit_free:
-	free(buf);
-exit_close:
-	fclose(f);
-	return btf;
-}
-
-static bool is_btf_raw(const char *file)
-{
-	__u16 magic = 0;
-	int fd, nb_read;
-
-	fd = open(file, O_RDONLY);
-	if (fd < 0)
-		return false;
-
-	nb_read = read(fd, &magic, sizeof(magic));
-	close(fd);
-	return nb_read == sizeof(magic) && magic == BTF_MAGIC;
-}
-
 static int do_dump(int argc, char **argv)
 {
 	struct btf *btf = NULL;
@@ -547,11 +499,7 @@ static int do_dump(int argc, char **argv
 		}
 		NEXT_ARG();
 	} else if (is_prefix(src, "file")) {
-		if (is_btf_raw(*argv))
-			btf = btf__parse_raw(*argv);
-		else
-			btf = btf__parse_elf(*argv, NULL);
-
+		btf = btf__parse(*argv, NULL);
 		if (IS_ERR(btf)) {
 			err = -PTR_ERR(btf);
 			btf = NULL;