1*14f1aae1SAndrii Nakryiko // SPDX-License-Identifier: GPL-2.0
2*14f1aae1SAndrii Nakryiko /* Copyright (c) 2021 Facebook */
3*14f1aae1SAndrii Nakryiko 
4*14f1aae1SAndrii Nakryiko #include "vmlinux.h"
5*14f1aae1SAndrii Nakryiko #include <bpf/bpf_helpers.h>
6*14f1aae1SAndrii Nakryiko #include <bpf/bpf_tracing.h>
7*14f1aae1SAndrii Nakryiko 
8*14f1aae1SAndrii Nakryiko extern int LINUX_KERNEL_VERSION __kconfig;
9*14f1aae1SAndrii Nakryiko /* this weak extern will be strict due to the other file's strong extern */
10*14f1aae1SAndrii Nakryiko extern bool CONFIG_BPF_SYSCALL __kconfig __weak;
11*14f1aae1SAndrii Nakryiko extern const void bpf_link_fops __ksym __weak;
12*14f1aae1SAndrii Nakryiko 
13*14f1aae1SAndrii Nakryiko int input_bss1;
14*14f1aae1SAndrii Nakryiko int input_data1 = 1;
15*14f1aae1SAndrii Nakryiko const volatile int input_rodata1 = 11;
16*14f1aae1SAndrii Nakryiko 
17*14f1aae1SAndrii Nakryiko int input_bss_weak __weak;
18*14f1aae1SAndrii Nakryiko /* these two definitions should win */
19*14f1aae1SAndrii Nakryiko int input_data_weak __weak = 10;
20*14f1aae1SAndrii Nakryiko const volatile int input_rodata_weak __weak = 100;
21*14f1aae1SAndrii Nakryiko 
22*14f1aae1SAndrii Nakryiko extern int input_bss2;
23*14f1aae1SAndrii Nakryiko extern int input_data2;
24*14f1aae1SAndrii Nakryiko extern const int input_rodata2;
25*14f1aae1SAndrii Nakryiko 
26*14f1aae1SAndrii Nakryiko int output_bss1;
27*14f1aae1SAndrii Nakryiko int output_data1;
28*14f1aae1SAndrii Nakryiko int output_rodata1;
29*14f1aae1SAndrii Nakryiko 
30*14f1aae1SAndrii Nakryiko long output_sink1;
31*14f1aae1SAndrii Nakryiko 
get_bss_res(void)32*14f1aae1SAndrii Nakryiko static __noinline int get_bss_res(void)
33*14f1aae1SAndrii Nakryiko {
34*14f1aae1SAndrii Nakryiko 	/* just make sure all the relocations work against .text as well */
35*14f1aae1SAndrii Nakryiko 	return input_bss1 + input_bss2 + input_bss_weak;
36*14f1aae1SAndrii Nakryiko }
37*14f1aae1SAndrii Nakryiko 
38*14f1aae1SAndrii Nakryiko SEC("raw_tp/sys_enter")
BPF_PROG(handler1)39*14f1aae1SAndrii Nakryiko int BPF_PROG(handler1)
40*14f1aae1SAndrii Nakryiko {
41*14f1aae1SAndrii Nakryiko 	output_bss1 = get_bss_res();
42*14f1aae1SAndrii Nakryiko 	output_data1 = input_data1 + input_data2 + input_data_weak;
43*14f1aae1SAndrii Nakryiko 	output_rodata1 = input_rodata1 + input_rodata2 + input_rodata_weak;
44*14f1aae1SAndrii Nakryiko 
45*14f1aae1SAndrii Nakryiko 	/* make sure we actually use above special externs, otherwise compiler
46*14f1aae1SAndrii Nakryiko 	 * will optimize them out
47*14f1aae1SAndrii Nakryiko 	 */
48*14f1aae1SAndrii Nakryiko 	output_sink1 = LINUX_KERNEL_VERSION
49*14f1aae1SAndrii Nakryiko 		       + CONFIG_BPF_SYSCALL
50*14f1aae1SAndrii Nakryiko 		       + (long)&bpf_link_fops;
51*14f1aae1SAndrii Nakryiko 	return 0;
52*14f1aae1SAndrii Nakryiko }
53*14f1aae1SAndrii Nakryiko 
54*14f1aae1SAndrii Nakryiko char LICENSE[] SEC("license") = "GPL";
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