1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019 Facebook */
3
4#include <stdbool.h>
5#include <linux/bpf.h>
6#include <bpf/bpf_helpers.h>
7
8#define __read_mostly SEC(".data.read_mostly")
9
10struct s {
11	int a;
12	long long b;
13} __attribute__((packed));
14
15/* .data section */
16int in1 = -1;
17long long in2 = -1;
18
19/* .bss section */
20char in3 = '\0';
21long long in4 __attribute__((aligned(64))) = 0;
22struct s in5 = {};
23
24/* .rodata section */
25const volatile struct {
26	const int in6;
27} in = {};
28
29/* .data section */
30int out1 = -1;
31long long out2 = -1;
32
33/* .bss section */
34char out3 = 0;
35long long out4 = 0;
36int out6 = 0;
37
38extern bool CONFIG_BPF_SYSCALL __kconfig;
39extern int LINUX_KERNEL_VERSION __kconfig;
40bool bpf_syscall = 0;
41int kern_ver = 0;
42
43struct s out5 = {};
44
45
46const volatile int in_dynarr_sz SEC(".rodata.dyn");
47const volatile int in_dynarr[4] SEC(".rodata.dyn") = { -1, -2, -3, -4 };
48
49int out_dynarr[4] SEC(".data.dyn") = { 1, 2, 3, 4 };
50
51int read_mostly_var __read_mostly;
52int out_mostly_var;
53
54char huge_arr[16 * 1024 * 1024];
55
56/* non-mmapable custom .data section */
57
58struct my_value { int x, y, z; };
59
60__hidden int zero_key SEC(".data.non_mmapable");
61static struct my_value zero_value SEC(".data.non_mmapable");
62
63struct {
64	__uint(type, BPF_MAP_TYPE_ARRAY);
65	__type(key, int);
66	__type(value, struct my_value);
67	__uint(max_entries, 1);
68} my_map SEC(".maps");
69
70SEC("raw_tp/sys_enter")
71int handler(const void *ctx)
72{
73	int i;
74
75	out1 = in1;
76	out2 = in2;
77	out3 = in3;
78	out4 = in4;
79	out5 = in5;
80	out6 = in.in6;
81
82	bpf_syscall = CONFIG_BPF_SYSCALL;
83	kern_ver = LINUX_KERNEL_VERSION;
84
85	for (i = 0; i < in_dynarr_sz; i++)
86		out_dynarr[i] = in_dynarr[i];
87
88	out_mostly_var = read_mostly_var;
89
90	huge_arr[sizeof(huge_arr) - 1] = 123;
91
92	/* make sure zero_key and zero_value are not optimized out */
93	bpf_map_update_elem(&my_map, &zero_key, &zero_value, BPF_ANY);
94
95	return 0;
96}
97
98char _license[] SEC("license") = "GPL";
99