1 // SPDX-License-Identifier: GPL-2.0
2 #define _GNU_SOURCE
3 #include <test_progs.h>
4 #include "test_task_pt_regs.skel.h"
5 
6 /* uprobe attach point */
trigger_func(void)7 static noinline void trigger_func(void)
8 {
9 	asm volatile ("");
10 }
11 
test_task_pt_regs(void)12 void test_task_pt_regs(void)
13 {
14 	struct test_task_pt_regs *skel;
15 	struct bpf_link *uprobe_link;
16 	ssize_t uprobe_offset;
17 	bool match;
18 
19 	uprobe_offset = get_uprobe_offset(&trigger_func);
20 	if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
21 		return;
22 
23 	skel = test_task_pt_regs__open_and_load();
24 	if (!ASSERT_OK_PTR(skel, "skel_open"))
25 		return;
26 	if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
27 		goto cleanup;
28 
29 	uprobe_link = bpf_program__attach_uprobe(skel->progs.handle_uprobe,
30 						 false /* retprobe */,
31 						 0 /* self pid */,
32 						 "/proc/self/exe",
33 						 uprobe_offset);
34 	if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe"))
35 		goto cleanup;
36 	skel->links.handle_uprobe = uprobe_link;
37 
38 	/* trigger & validate uprobe */
39 	trigger_func();
40 
41 	if (!ASSERT_EQ(skel->bss->uprobe_res, 1, "check_uprobe_res"))
42 		goto cleanup;
43 
44 	match = !memcmp(&skel->bss->current_regs, &skel->bss->ctx_regs,
45 			sizeof(skel->bss->current_regs));
46 	ASSERT_TRUE(match, "check_regs_match");
47 
48 cleanup:
49 	test_task_pt_regs__destroy(skel);
50 }
51