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1// SPDX-License-Identifier: GPL-2.02/* 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