blob: ef9e9d0bb0cafc77ddbe3621a8a3936e320c99c6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
extern int LINUX_KERNEL_VERSION __kconfig;
/* this weak extern will be strict due to the other file's strong extern */
extern bool CONFIG_BPF_SYSCALL __kconfig __weak;
extern const void bpf_link_fops __ksym __weak;
int input_bss1;
int input_data1 = 1;
const volatile int input_rodata1 = 11;
int input_bss_weak __weak;
/* these two definitions should win */
int input_data_weak __weak = 10;
const volatile int input_rodata_weak __weak = 100;
extern int input_bss2;
extern int input_data2;
extern const int input_rodata2;
int output_bss1;
int output_data1;
int output_rodata1;
long output_sink1;
static __noinline int get_bss_res(void)
{
/* just make sure all the relocations work against .text as well */
return input_bss1 + input_bss2 + input_bss_weak;
}
SEC("raw_tp/sys_enter")
int BPF_PROG(handler1)
{
output_bss1 = get_bss_res();
output_data1 = input_data1 + input_data2 + input_data_weak;
output_rodata1 = input_rodata1 + input_rodata2 + input_rodata_weak;
/* make sure we actually use above special externs, otherwise compiler
* will optimize them out
*/
output_sink1 = LINUX_KERNEL_VERSION
+ CONFIG_BPF_SYSCALL
+ (long)&bpf_link_fops;
return 0;
}
char LICENSE[] SEC("license") = "GPL";
|
