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 10 struct s { 11 int a; 12 long long b; 13 } __attribute__((packed)); 14 15 /* .data section */ 16 int in1 = -1; 17 long long in2 = -1; 18 19 /* .bss section */ 20 char in3 = '\0'; 21 long long in4 __attribute__((aligned(64))) = 0; 22 struct s in5 = {}; 23 24 /* .rodata section */ 25 const volatile struct { 26 const int in6; 27 } in = {}; 28 29 /* .data section */ 30 int out1 = -1; 31 long long out2 = -1; 32 33 /* .bss section */ 34 char out3 = 0; 35 long long out4 = 0; 36 int out6 = 0; 37 38 extern bool CONFIG_BPF_SYSCALL __kconfig; 39 extern int LINUX_KERNEL_VERSION __kconfig; 40 bool bpf_syscall = 0; 41 int kern_ver = 0; 42 43 struct s out5 = {}; 44 45 46 const volatile int in_dynarr_sz SEC(".rodata.dyn"); 47 const volatile int in_dynarr[4] SEC(".rodata.dyn") = { -1, -2, -3, -4 }; 48 49 int out_dynarr[4] SEC(".data.dyn") = { 1, 2, 3, 4 }; 50 51 int read_mostly_var __read_mostly; 52 int out_mostly_var; 53 54 SEC("raw_tp/sys_enter") 55 int handler(const void *ctx) 56 { 57 int i; 58 59 out1 = in1; 60 out2 = in2; 61 out3 = in3; 62 out4 = in4; 63 out5 = in5; 64 out6 = in.in6; 65 66 bpf_syscall = CONFIG_BPF_SYSCALL; 67 kern_ver = LINUX_KERNEL_VERSION; 68 69 for (i = 0; i < in_dynarr_sz; i++) 70 out_dynarr[i] = in_dynarr[i]; 71 72 out_mostly_var = read_mostly_var; 73 74 return 0; 75 } 76 77 char _license[] SEC("license") = "GPL"; 78