netdev - [PATCH 7/7] selftests/bpf: Add test for bpf_get_func

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Date:   Wed,  7 Jul 2021 21:46:19 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH 7/7] selftests/bpf: Add test for bpf_get_func_ip in kprobe+offset probe

Adding test for bpf_get_func_ip in kprobe+ofset probe.
Because of the offset value it's arch specific, adding
it only for x86_64 architecture.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 .../testing/selftests/bpf/progs/get_func_ip_test.c  | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
index 8ca54390d2b1..e8a9428a0ea3 100644
--- a/tools/testing/selftests/bpf/progs/get_func_ip_test.c
+++ b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
@@ -10,6 +10,7 @@ extern const void bpf_fentry_test2 __ksym;
 extern const void bpf_fentry_test3 __ksym;
 extern const void bpf_fentry_test4 __ksym;
 extern const void bpf_modify_return_test __ksym;
+extern const void bpf_fentry_test6 __ksym;
 
 __u64 test1_result = 0;
 SEC("fentry/bpf_fentry_test1")
@@ -60,3 +61,15 @@ int BPF_PROG(fmod_ret_test, int a, int *b, int ret)
 	test5_result = (const void *) addr == &bpf_modify_return_test;
 	return ret;
 }
+
+#ifdef __x86_64__
+__u64 test6_result = 0;
+SEC("kprobe/bpf_fentry_test6+0x5")
+int test6(struct pt_regs *ctx)
+{
+	__u64 addr = bpf_get_func_ip(ctx);
+
+	test6_result = (const void *) addr == &bpf_fentry_test6 + 5;
+	return 0;
+}
+#endif
-- 
2.31.1