// 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; /* this weak extern will be strict due to the other file's strong extern */ extern bool CONFIG_BPF_SYSCALL __kconfig __weak; extern const void bpf_link_fops __ksym __weak; int input_bss1; int input_data1 = 1; const volatile int input_rodata1 = 11; int input_bss_weak __weak; /* these two definitions should win */ int input_data_weak __weak = 10; const volatile int input_rodata_weak __weak = 100; extern int input_bss2; extern int input_data2; extern const int input_rodata2; int output_bss1; int output_data1; int output_rodata1; long output_sink1; static __noinline int get_bss_res(void) { /* just make sure all the relocations work against .text as well */ return input_bss1 + input_bss2 + input_bss_weak; } SEC("raw_tp/sys_enter") int BPF_PROG(handler1) { output_bss1 = get_bss_res(); output_data1 = input_data1 + input_data2 + input_data_weak; output_rodata1 = input_rodata1 + input_rodata2 + input_rodata_weak; /* make sure we actually use above special externs, otherwise compiler * will optimize them out */ output_sink1 = LINUX_KERNEL_VERSION + CONFIG_BPF_SYSCALL + (long)&bpf_link_fops; return 0; } char LICENSE[] SEC("license") = "GPL";