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tools/resolve_btfids: Use libbpf's btf__parse() API 

Instead of re-implementing generic BTF parsing logic, use libbpf's API.
Also add .gitignore for resolve_btfids's build artifacts.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200802013219.864880-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-08-01 18:32:19 -07:00 committed by Daniel Borkmann
parent 8526df0457
commit f86ca3cffe
2 changed files with 5 additions and 57 deletions
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4
tools/bpf/resolve_btfids/.gitignore vendored Normal file
View File

@ -0,0 +1,4 @@
/FEATURE-DUMP.libbpf
/bpf_helper_defs.h
/fixdep
/resolve_btfids

58
tools/bpf/resolve_btfids/main.c
View File

@ -403,62 +403,6 @@ static int symbols_collect(struct object *obj)
return 0; return 0;
} }
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 struct btf *btf_open(const char *path)
{
if (is_btf_raw(path))
return btf__parse_raw(path);
else
return btf__parse_elf(path, NULL);
}
static int symbols_resolve(struct object *obj) static int symbols_resolve(struct object *obj)
{ {
int nr_typedefs = obj->nr_typedefs; int nr_typedefs = obj->nr_typedefs;
@ -469,7 +413,7 @@ static int symbols_resolve(struct object *obj)
struct btf *btf; struct btf *btf;
__u32 nr; __u32 nr;
btf = btf_open(obj->btf ?: obj->path); btf = btf__parse(obj->btf ?: obj->path, NULL);
err = libbpf_get_error(btf); err = libbpf_get_error(btf);
if (err) { if (err) {
pr_err("FAILED: load BTF from %s: %s", pr_err("FAILED: load BTF from %s: %s",