1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (c) 2019 Facebook |
3 | |
4 | #include <linux/bpf.h> |
5 | #include <stdint.h> |
6 | #include <bpf/bpf_helpers.h> |
7 | #include <bpf/bpf_core_read.h> |
8 | |
9 | char _license[] SEC("license" ) = "GPL" ; |
10 | |
11 | struct { |
12 | char in[256]; |
13 | char out[256]; |
14 | } data = {}; |
15 | |
16 | struct core_reloc_nesting_substruct { |
17 | int a; |
18 | }; |
19 | |
20 | union core_reloc_nesting_subunion { |
21 | int b; |
22 | }; |
23 | |
24 | /* int a.a.a and b.b.b accesses */ |
25 | struct core_reloc_nesting { |
26 | union { |
27 | struct core_reloc_nesting_substruct a; |
28 | } a; |
29 | struct { |
30 | union core_reloc_nesting_subunion b; |
31 | } b; |
32 | }; |
33 | |
34 | #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src) |
35 | |
36 | SEC("raw_tracepoint/sys_enter" ) |
37 | int test_core_nesting(void *ctx) |
38 | { |
39 | struct core_reloc_nesting *in = (void *)&data.in; |
40 | struct core_reloc_nesting *out = (void *)&data.out; |
41 | |
42 | if (CORE_READ(&out->a.a.a, &in->a.a.a)) |
43 | return 1; |
44 | if (CORE_READ(&out->b.b.b, &in->b.b.b)) |
45 | return 1; |
46 | |
47 | return 0; |
48 | } |
49 | |
50 | |