tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
56SEC("raw_tp/sys_enter")
57int handler(const void *ctx)
58{
59 int i;
60
61 out1 = in1;
62 out2 = in2;
63 out3 = in3;
64 out4 = in4;
65 out5 = in5;
66 out6 = in.in6;
67
68 bpf_syscall = CONFIG_BPF_SYSCALL;
69 kern_ver = LINUX_KERNEL_VERSION;
70
71 for (i = 0; i < in_dynarr_sz; i++)
72 out_dynarr[i] = in_dynarr[i];
73
74 out_mostly_var = read_mostly_var;
75
76 huge_arr[sizeof(huge_arr) - 1] = 123;
77
78 return 0;
79}
80
81char _license[] SEC("license") = "GPL";