diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/attach_probe.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/attach_probe.c | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c index e40b41c44f8b..bf307bb9e446 100644 --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c @@ -2,14 +2,18 @@ #include <test_progs.h> #include "test_attach_probe.skel.h" +/* this is how USDT semaphore is actually defined, except volatile modifier */ +volatile unsigned short uprobe_ref_ctr __attribute__((unused)) __attribute((section(".probes"))); + void test_attach_probe(void) { + DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts); int duration = 0; struct bpf_link *kprobe_link, *kretprobe_link; struct bpf_link *uprobe_link, *uretprobe_link; struct test_attach_probe* skel; size_t uprobe_offset; - ssize_t base_addr; + ssize_t base_addr, ref_ctr_offset; base_addr = get_base_addr(); if (CHECK(base_addr < 0, "get_base_addr", @@ -17,6 +21,10 @@ void test_attach_probe(void) return; uprobe_offset = get_uprobe_offset(&get_base_addr, base_addr); + ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr); + if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset")) + return; + skel = test_attach_probe__open_and_load(); if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) return; @@ -37,20 +45,28 @@ void test_attach_probe(void) goto cleanup; skel->links.handle_kretprobe = kretprobe_link; - uprobe_link = bpf_program__attach_uprobe(skel->progs.handle_uprobe, - false /* retprobe */, - 0 /* self pid */, - "/proc/self/exe", - uprobe_offset); + ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before"); + + uprobe_opts.retprobe = false; + uprobe_opts.ref_ctr_offset = ref_ctr_offset; + uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe, + 0 /* self pid */, + "/proc/self/exe", + uprobe_offset, + &uprobe_opts); if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe")) goto cleanup; skel->links.handle_uprobe = uprobe_link; - uretprobe_link = bpf_program__attach_uprobe(skel->progs.handle_uretprobe, - true /* retprobe */, - -1 /* any pid */, - "/proc/self/exe", - uprobe_offset); + ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after"); + + /* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */ + uprobe_opts.retprobe = true; + uprobe_opts.ref_ctr_offset = ref_ctr_offset; + uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe, + -1 /* any pid */, + "/proc/self/exe", + uprobe_offset, &uprobe_opts); if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe")) goto cleanup; skel->links.handle_uretprobe = uretprobe_link; @@ -77,4 +93,5 @@ void test_attach_probe(void) cleanup: test_attach_probe__destroy(skel); + ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_cleanup"); } |