Adding test code for mov and sub instructions emulation. TODO add test for sub flags value emulation.
Signed-off-by: Jiri Olsa <[email protected]> --- .../selftests/bpf/prog_tests/uprobe_syscall.c | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c index 955a37751b52..27fa6f309188 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c @@ -765,6 +765,54 @@ static void test_uprobe_error(void) ASSERT_EQ(errno, ENXIO, "errno"); } +__attribute__((aligned(16))) +__nocf_check __weak __naked unsigned long emulate_mov_trigger(void) +{ + asm volatile ( + "pushq %rbp\n" + "movq %rsp,%rbp\n" + "subq $0xb0,%rsp\n" + "addq $0xb0,%rsp\n" + "pop %rbp\n" + "ret\n" + ); +} + +static void test_emulate(void) +{ + struct uprobe_syscall *skel = NULL; + unsigned long offset; + + offset = get_uprobe_offset(&emulate_mov_trigger); + if (!ASSERT_GE(offset, 0, "get_uprobe_offset")) + return; + + skel = uprobe_syscall__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_syscall__open_and_load")) + goto cleanup; + + /* mov */ + skel->links.probe = bpf_program__attach_uprobe_opts(skel->progs.probe, + 0, "/proc/self/exe", offset + 1, NULL); + if (!ASSERT_OK_PTR(skel->links.probe, "bpf_program__attach_uprobe_opts")) + goto cleanup; + + emulate_mov_trigger(); + + bpf_link__destroy(skel->links.probe); + + /* sub */ + skel->links.probe = bpf_program__attach_uprobe_opts(skel->progs.probe, + 0, "/proc/self/exe", offset + 4, NULL); + if (!ASSERT_OK_PTR(skel->links.probe, "bpf_program__attach_uprobe_opts")) + goto cleanup; + + emulate_mov_trigger(); + +cleanup: + uprobe_syscall__destroy(skel); +} + static void __test_uprobe_syscall(void) { if (test__start_subtest("uretprobe_regs_equal")) @@ -789,6 +837,8 @@ static void __test_uprobe_syscall(void) test_uprobe_regs_equal(false); if (test__start_subtest("regs_change")) test_regs_change(); + if (test__start_subtest("emulate_mov")) + test_emulate(); } #else static void __test_uprobe_syscall(void) -- 2.51.1
