1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (c) 2021 Facebook */ |
3 | |
4 | #include "vmlinux.h" |
5 | #include <bpf/bpf_helpers.h> |
6 | #include <bpf/bpf_tracing.h> |
7 | |
8 | extern int LINUX_KERNEL_VERSION __kconfig; |
9 | /* when an extern is defined as both strong and weak, resulting symbol will be strong */ |
10 | extern bool CONFIG_BPF_SYSCALL __kconfig; |
11 | extern const void __start_BTF __ksym; |
12 | |
13 | int input_bss2; |
14 | int input_data2 = 2; |
15 | const volatile int input_rodata2 = 22; |
16 | |
17 | int input_bss_weak __weak; |
18 | /* these two weak variables should lose */ |
19 | int input_data_weak __weak = 20; |
20 | const volatile int input_rodata_weak __weak = 200; |
21 | |
22 | extern int input_bss1; |
23 | extern int input_data1; |
24 | extern const int input_rodata1; |
25 | |
26 | int output_bss2; |
27 | int output_data2; |
28 | int output_rodata2; |
29 | |
30 | int output_sink2; |
31 | |
32 | static __noinline int get_data_res(void) |
33 | { |
34 | /* just make sure all the relocations work against .text as well */ |
35 | return input_data1 + input_data2 + input_data_weak; |
36 | } |
37 | |
38 | SEC("raw_tp/sys_enter" ) |
39 | int BPF_PROG(handler2) |
40 | { |
41 | output_bss2 = input_bss1 + input_bss2 + input_bss_weak; |
42 | output_data2 = get_data_res(); |
43 | output_rodata2 = input_rodata1 + input_rodata2 + input_rodata_weak; |
44 | |
45 | /* make sure we actually use above special externs, otherwise compiler |
46 | * will optimize them out |
47 | */ |
48 | output_sink2 = LINUX_KERNEL_VERSION |
49 | + CONFIG_BPF_SYSCALL |
50 | + (long)&__start_BTF; |
51 | |
52 | return 0; |
53 | } |
54 | |
55 | char LICENSE[] SEC("license" ) = "GPL" ; |
56 | |