// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2019 Facebook */ #include <stdbool.h> #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #define __read_mostly SEC(".data.read_mostly") struct s { int a; long long b; } __attribute__((packed)); /* .data section */ int in1 = -1; long long in2 = -1; /* .bss section */ char in3 = '\0'; long long in4 __attribute__((aligned(64))) = 0; struct s in5 = {}; /* .rodata section */ const volatile struct { const int in6; } in = {}; /* .data section */ int out1 = -1; long long out2 = -1; /* .bss section */ char out3 = 0; long long out4 = 0; int out6 = 0; extern bool CONFIG_BPF_SYSCALL __kconfig; extern int LINUX_KERNEL_VERSION __kconfig; bool bpf_syscall = 0; int kern_ver = 0; struct s out5 = {}; const volatile int in_dynarr_sz SEC(".rodata.dyn"); const volatile int in_dynarr[4] SEC(".rodata.dyn") = { -1, -2, -3, -4 }; int out_dynarr[4] SEC(".data.dyn") = { 1, 2, 3, 4 }; int read_mostly_var __read_mostly; int out_mostly_var; char huge_arr[16 * 1024 * 1024]; /* non-mmapable custom .data section */ struct my_value { int x, y, z; }; __hidden int zero_key SEC(".data.non_mmapable"); static struct my_value zero_value SEC(".data.non_mmapable"); struct { __uint(type, BPF_MAP_TYPE_ARRAY); __type(key, int); __type(value, struct my_value); __uint(max_entries, 1); } my_map SEC(".maps"); SEC("raw_tp/sys_enter") int handler(const void *ctx) { int i; out1 = in1; out2 = in2; out3 = in3; out4 = in4; out5 = in5; out6 = in.in6; bpf_syscall = CONFIG_BPF_SYSCALL; kern_ver = LINUX_KERNEL_VERSION; for (i = 0; i < in_dynarr_sz; i++) out_dynarr[i] = in_dynarr[i]; out_mostly_var = read_mostly_var; huge_arr[sizeof(huge_arr) - 1] = 123; /* make sure zero_key and zero_value are not optimized out */ bpf_map_update_elem(&my_map, &zero_key, &zero_value, BPF_ANY); return 0; } char _license[] SEC("license") = "GPL";