1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3
4#include <test_progs.h>
5
6struct callback_head {
7	struct callback_head *next;
8	void (*func)(struct callback_head *head);
9};
10
11/* ___shuffled flavor is just an illusion for BPF code, it doesn't really
12 * exist and user-space needs to provide data in the memory layout that
13 * matches callback_head. We just defined ___shuffled flavor to make it easier
14 * to work with the skeleton
15 */
16struct callback_head___shuffled {
17	struct callback_head___shuffled *next;
18	void (*func)(struct callback_head *head);
19};
20
21#include "test_core_read_macros.skel.h"
22
23void test_core_read_macros(void)
24{
25	int duration = 0, err;
26	struct test_core_read_macros* skel;
27	struct test_core_read_macros__bss *bss;
28	struct callback_head u_probe_in;
29	struct callback_head___shuffled u_core_in;
30
31	skel = test_core_read_macros__open_and_load();
32	if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
33		return;
34	bss = skel->bss;
35	bss->my_pid = getpid();
36
37	/* next pointers have to be set from the kernel side */
38	bss->k_probe_in.func = (void *)(long)0x1234;
39	bss->k_core_in.func = (void *)(long)0xabcd;
40
41	u_probe_in.next = &u_probe_in;
42	u_probe_in.func = (void *)(long)0x5678;
43	bss->u_probe_in = &u_probe_in;
44
45	u_core_in.next = &u_core_in;
46	u_core_in.func = (void *)(long)0xdbca;
47	bss->u_core_in = &u_core_in;
48
49	err = test_core_read_macros__attach(skel);
50	if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
51		goto cleanup;
52
53	/* trigger tracepoint */
54	usleep(1);
55
56	ASSERT_EQ(bss->k_probe_out, 0x1234, "k_probe_out");
57	ASSERT_EQ(bss->k_core_out, 0xabcd, "k_core_out");
58
59	ASSERT_EQ(bss->u_probe_out, 0x5678, "u_probe_out");
60	ASSERT_EQ(bss->u_core_out, 0xdbca, "u_core_out");
61
62cleanup:
63	test_core_read_macros__destroy(skel);
64}
65