s390/test_unwind: add kretprobe tests
Add tests to verify that s390 kretprobes maintain a correct stack chain and ensure their proper function. Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Tobias Huschle <huschle@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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@ -132,6 +132,7 @@ static struct unwindme *unwindme;
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#define UWM_PGM 0x40 /* Unwind from program check handler */
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#define UWM_KPROBE_ON_FTRACE 0x80 /* Unwind from kprobe handler called via ftrace. */
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#define UWM_FTRACE 0x100 /* Unwind from ftrace handler. */
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#define UWM_KRETPROBE 0x200 /* Unwind kretprobe handlers. */
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static __always_inline unsigned long get_psw_addr(void)
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{
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@ -143,6 +144,55 @@ static __always_inline unsigned long get_psw_addr(void)
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return psw_addr;
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}
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static int kretprobe_ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
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{
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struct unwindme *u = unwindme;
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u->ret = test_unwind(NULL, (u->flags & UWM_REGS) ? regs : NULL,
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(u->flags & UWM_SP) ? u->sp : 0);
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return 0;
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}
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static noinline notrace void test_unwind_kretprobed_func(void)
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{
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asm volatile(" nop\n");
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}
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static noinline void test_unwind_kretprobed_func_caller(void)
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{
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test_unwind_kretprobed_func();
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}
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static int test_unwind_kretprobe(struct unwindme *u)
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{
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int ret;
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struct kretprobe my_kretprobe;
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if (!IS_ENABLED(CONFIG_KPROBES))
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kunit_skip(current_test, "requires CONFIG_KPROBES");
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u->ret = -1; /* make sure kprobe is called */
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unwindme = u;
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memset(&my_kretprobe, 0, sizeof(my_kretprobe));
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my_kretprobe.handler = kretprobe_ret_handler;
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my_kretprobe.maxactive = 1;
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my_kretprobe.kp.addr = (kprobe_opcode_t *)test_unwind_kretprobed_func;
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ret = register_kretprobe(&my_kretprobe);
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if (ret < 0) {
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kunit_err(current_test, "register_kretprobe failed %d\n", ret);
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return -EINVAL;
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}
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test_unwind_kretprobed_func_caller();
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unregister_kretprobe(&my_kretprobe);
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unwindme = NULL;
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return u->ret;
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}
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static int kprobe_pre_handler(struct kprobe *p, struct pt_regs *regs)
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{
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struct unwindme *u = unwindme;
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@ -254,6 +304,8 @@ static noinline int unwindme_func4(struct unwindme *u)
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return 0;
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} else if (u->flags & (UWM_PGM | UWM_KPROBE_ON_FTRACE)) {
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return test_unwind_kprobe(u);
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} else if (u->flags & (UWM_KRETPROBE)) {
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return test_unwind_kretprobe(u);
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} else if (u->flags & UWM_FTRACE) {
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return test_unwind_ftrace(u);
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} else {
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@ -396,6 +448,10 @@ static const struct test_params param_list[] = {
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TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP),
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TEST_WITH_FLAGS(UWM_FTRACE | UWM_REGS),
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TEST_WITH_FLAGS(UWM_FTRACE | UWM_SP | UWM_REGS),
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TEST_WITH_FLAGS(UWM_KRETPROBE),
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TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_SP),
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TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_REGS),
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TEST_WITH_FLAGS(UWM_KRETPROBE | UWM_SP | UWM_REGS),
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};
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/*
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