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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2021 Facebook */3 4#include "vmlinux.h"5#include <bpf/bpf_helpers.h>6#include <bpf/bpf_tracing.h>7 8extern int LINUX_KERNEL_VERSION __kconfig;9/* when an extern is defined as both strong and weak, resulting symbol will be strong */10extern bool CONFIG_BPF_SYSCALL __kconfig;11extern const void __start_BTF __ksym;12 13int input_bss2;14int input_data2 = 2;15const volatile int input_rodata2 = 22;16 17int input_bss_weak __weak;18/* these two weak variables should lose */19int input_data_weak __weak = 20;20const volatile int input_rodata_weak __weak = 200;21 22extern int input_bss1;23extern int input_data1;24extern const int input_rodata1;25 26int output_bss2;27int output_data2;28int output_rodata2;29 30int output_sink2;31 32static __noinline int get_data_res(void)33{34 /* just make sure all the relocations work against .text as well */35 return input_data1 + input_data2 + input_data_weak;36}37 38SEC("raw_tp/sys_enter")39int BPF_PROG(handler2)40{41 output_bss2 = input_bss1 + input_bss2 + input_bss_weak;42 output_data2 = get_data_res();43 output_rodata2 = input_rodata1 + input_rodata2 + input_rodata_weak;44 45 /* make sure we actually use above special externs, otherwise compiler46 * will optimize them out47 */48 output_sink2 = LINUX_KERNEL_VERSION49 + CONFIG_BPF_SYSCALL50 + (long)&__start_BTF;51 52 return 0;53}54 55char LICENSE[] SEC("license") = "GPL";56