Commit e5d532be authored by Jiri Olsa's avatar Jiri Olsa Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add stacktrace ips test for fentry/fexit 



Adding test that attaches fentry/fexitand verifies the
ORC stacktrace matches expected functions.

The test is only for ORC unwinder to keep it simple.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260126211837.472802-6-jolsa@kernel.org
parent 7373f97e

tools/testing/selftests/bpf/prog_tests/stacktrace_ips.c

+51 −0
Original line number Diff line number Diff line
@@ -183,6 +183,53 @@ static void test_stacktrace_ips_kprobe(bool retprobe) 
	stacktrace_ips__destroy(skel);

}



static void test_stacktrace_ips_trampoline(bool retprobe)

{

	LIBBPF_OPTS(bpf_test_run_opts, topts);

	struct stacktrace_ips *skel;



	skel = stacktrace_ips__open_and_load();

	if (!ASSERT_OK_PTR(skel, "stacktrace_ips__open_and_load"))

		return;



	if (!skel->kconfig->CONFIG_UNWINDER_ORC) {

		test__skip();

		goto cleanup;

	}



	if (retprobe) {

		skel->links.fexit_test = bpf_program__attach_trace(skel->progs.fexit_test);

		if (!ASSERT_OK_PTR(skel->links.fexit_test, "bpf_program__attach_trace"))

			goto cleanup;

	} else {

		skel->links.fentry_test = bpf_program__attach_trace(skel->progs.fentry_test);

		if (!ASSERT_OK_PTR(skel->links.fentry_test, "bpf_program__attach_trace"))

			goto cleanup;

	}



	trigger_module_test_read(1);



	load_kallsyms();



	if (retprobe) {

		check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 4,

				     ksym_get_addr("bpf_testmod_stacktrace_test_3"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_2"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_1"),

				     ksym_get_addr("bpf_testmod_test_read"));

	} else {

		check_stacktrace_ips(bpf_map__fd(skel->maps.stackmap), skel->bss->stack_key, 5,

				     ksym_get_addr("bpf_testmod_stacktrace_test"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_3"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_2"),

				     ksym_get_addr("bpf_testmod_stacktrace_test_1"),

				     ksym_get_addr("bpf_testmod_test_read"));

	}



cleanup:

	stacktrace_ips__destroy(skel);

}



static void __test_stacktrace_ips(void)

{

	if (test__start_subtest("kprobe_multi"))
@@ -195,6 +242,10 @@ static void __test_stacktrace_ips(void) 
		test_stacktrace_ips_kprobe(false);

	if (test__start_subtest("kretprobe"))

		test_stacktrace_ips_kprobe(true);

	if (test__start_subtest("fentry"))

		test_stacktrace_ips_trampoline(false);

	if (test__start_subtest("fexit"))

		test_stacktrace_ips_trampoline(true);

}

#else

static void __test_stacktrace_ips(void)

tools/testing/selftests/bpf/progs/stacktrace_ips.c

+20 −0
Original line number Diff line number Diff line
@@ -53,4 +53,24 @@ int rawtp_test(void *ctx) 
	return 0;

}



SEC("fentry/bpf_testmod_stacktrace_test")

int fentry_test(struct pt_regs *ctx)

{

	/*

	 * Skip 2 bpf_program/trampoline stack entries:

	 * - bpf_prog_bd1f7a949f55fb03_fentry_test

	 * - bpf_trampoline_182536277701

	 */

	stack_key = bpf_get_stackid(ctx, &stackmap, 2);

	return 0;

}



SEC("fexit/bpf_testmod_stacktrace_test")

int fexit_test(struct pt_regs *ctx)

{

	/* Skip 2 bpf_program/trampoline stack entries, check fentry_test. */

	stack_key = bpf_get_stackid(ctx, &stackmap, 2);

	return 0;

}



char _license[] SEC("license") = "GPL";