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selftests/bpf: use btf__parse_elf to check presence of BTF/BTF.ext

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Switch test_btf.c to rely on btf__parse_elf to check presence of BTF and
BTF.ext data, instead of implementing its own ELF parsing.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-05-24 11:58:59 -07:00 • committed by Alexei Starovoitov
parent 58650cc473
commit 9db324314d
1 changed files with 13 additions and 58 deletions
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65
tools/testing/selftests/bpf/test_btf.c
View file

@ -4025,62 +4025,13 @@ static struct btf_file_test file_tests[] = {
}, },
}; };
static int file_has_btf_elf(const char *fn, bool *has_btf_ext)
{
Elf_Scn *scn = NULL;
GElf_Ehdr ehdr;
int ret = 0;
int elf_fd;
Elf *elf;
if (CHECK(elf_version(EV_CURRENT) == EV_NONE,
"elf_version(EV_CURRENT) == EV_NONE"))
return -1;
elf_fd = open(fn, O_RDONLY);
if (CHECK(elf_fd == -1, "open(%s): errno:%d", fn, errno))
return -1;
elf = elf_begin(elf_fd, ELF_C_READ, NULL);
if (CHECK(!elf, "elf_begin(%s): %s", fn, elf_errmsg(elf_errno()))) {
ret = -1;
goto done;
}
if (CHECK(!gelf_getehdr(elf, &ehdr), "!gelf_getehdr(%s)", fn)) {
ret = -1;
goto done;
}
while ((scn = elf_nextscn(elf, scn))) {
const char *sh_name;
GElf_Shdr sh;
if (CHECK(gelf_getshdr(scn, &sh) != &sh,
"file:%s gelf_getshdr != &sh", fn)) {
ret = -1;
goto done;
}
sh_name = elf_strptr(elf, ehdr.e_shstrndx, sh.sh_name);
if (!strcmp(sh_name, BTF_ELF_SEC))
ret = 1;
if (!strcmp(sh_name, BTF_EXT_ELF_SEC))
*has_btf_ext = true;
}
done:
close(elf_fd);
elf_end(elf);
return ret;
}
static int do_test_file(unsigned int test_num) static int do_test_file(unsigned int test_num)
{ {
const struct btf_file_test *test = &file_tests[test_num - 1]; const struct btf_file_test *test = &file_tests[test_num - 1];
const char *expected_fnames[] = {"_dummy_tracepoint", const char *expected_fnames[] = {"_dummy_tracepoint",
"test_long_fname_1", "test_long_fname_1",
"test_long_fname_2"}; "test_long_fname_2"};
struct btf_ext *btf_ext = NULL;
struct bpf_prog_info info = {}; struct bpf_prog_info info = {};
struct bpf_object *obj = NULL; struct bpf_object *obj = NULL;
struct bpf_func_info *finfo; struct bpf_func_info *finfo;
@ -4095,15 +4046,19 @@ static int do_test_file(unsigned int test_num)
fprintf(stderr, "BTF libbpf test[%u] (%s): ", test_num, fprintf(stderr, "BTF libbpf test[%u] (%s): ", test_num,
test->file); test->file);
err = file_has_btf_elf(test->file, &has_btf_ext); btf = btf__parse_elf(test->file, &btf_ext);
if (err == -1) if (IS_ERR(btf)) {
return err; if (PTR_ERR(btf) == -ENOENT) {
if (err == 0) {
fprintf(stderr, "SKIP. No ELF %s found", BTF_ELF_SEC); fprintf(stderr, "SKIP. No ELF %s found", BTF_ELF_SEC);
skip_cnt++; skip_cnt++;
return 0; return 0;
} }
return PTR_ERR(btf);
}
btf__free(btf);
has_btf_ext = btf_ext != NULL;
btf_ext__free(btf_ext);
obj = bpf_object__open(test->file); obj = bpf_object__open(test->file);
if (CHECK(IS_ERR(obj), "obj: %ld", PTR_ERR(obj))) if (CHECK(IS_ERR(obj), "obj: %ld", PTR_ERR(obj)))