1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3
4 #include <test_progs.h>
5
6 struct 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 */
16 struct 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
23 void 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
62 cleanup:
63 test_core_read_macros__destroy(skel);
64 }
65
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