// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2021 Facebook */ #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> extern int LINUX_KERNEL_VERSION __kconfig; /* when an extern is defined as both strong and weak, resulting symbol will be strong */ extern bool CONFIG_BPF_SYSCALL __kconfig; extern const void __start_BTF __ksym; int input_bss2; int input_data2 = 2; const volatile int input_rodata2 = 22; int input_bss_weak __weak; /* these two weak variables should lose */ int input_data_weak __weak = 20; const volatile int input_rodata_weak __weak = 200; extern int input_bss1; extern int input_data1; extern const int input_rodata1; int output_bss2; int output_data2; int output_rodata2; int output_sink2; static __noinline int get_data_res(void) { /* just make sure all the relocations work against .text as well */ return input_data1 + input_data2 + input_data_weak; } SEC("raw_tp/sys_enter") int BPF_PROG(handler2) { output_bss2 = input_bss1 + input_bss2 + input_bss_weak; output_data2 = get_data_res(); output_rodata2 = input_rodata1 + input_rodata2 + input_rodata_weak; /* make sure we actually use above special externs, otherwise compiler * will optimize them out */ output_sink2 = LINUX_KERNEL_VERSION + CONFIG_BPF_SYSCALL + (long)&__start_BTF; return 0; } char LICENSE[] SEC("license") = "GPL";