1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) Meta Platforms, Inc. and affiliates. */ 3 4 #include <stdbool.h> 5 #include <linux/bpf.h> 6 #include <bpf/bpf_helpers.h> 7 8 /* volatile to force a read */ 9 const volatile int var1; 10 volatile int var2 = 1; 11 struct { 12 int var3_1; 13 __s64 var3_2; 14 } var3; 15 int libout1; 16 17 extern volatile bool CONFIG_BPF_SYSCALL __kconfig; 18 19 int var4[4]; 20 21 __weak int var5 SEC(".data"); 22 23 /* Fully contained within library extern-and-definition */ 24 extern int var6; 25 26 int var7 SEC(".data.custom"); 27 28 int (*fn_ptr)(void); 29 30 struct { 31 __uint(type, BPF_MAP_TYPE_HASH); 32 __type(key, __u32); 33 __type(value, __u32); 34 __uint(max_entries, 16); 35 } map1 SEC(".maps"); 36 37 extern struct { 38 __uint(type, BPF_MAP_TYPE_HASH); 39 __type(key, __u32); 40 __type(value, __u32); 41 __uint(max_entries, 16); 42 } map2 SEC(".maps"); 43 44 int lib_routine(void) 45 { 46 __u32 key = 1, value = 2; 47 48 (void) CONFIG_BPF_SYSCALL; 49 bpf_map_update_elem(&map2, &key, &value, BPF_ANY); 50 51 libout1 = var1 + var2 + var3.var3_1 + var3.var3_2 + var5 + var6; 52 return libout1; 53 } 54 55 SEC("perf_event") 56 int lib_perf_handler(struct pt_regs *ctx) 57 { 58 return 0; 59 } 60 61 char LICENSE[] SEC("license") = "GPL"; 62