tools/testing/selftests/bpf/progs/test_ksyms.c

   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 __u64 out__bpf_link_fops = -1;
   9 __u64 out__bpf_link_fops1 = -1;
  10 __u64 out__btf_size = -1;
  11 __u64 out__per_cpu_start = -1;
  12
  13 extern const void bpf_link_fops __ksym;
  14 extern const void __start_BTF __ksym;
  15 extern const void __stop_BTF __ksym;
  16 extern const void __per_cpu_start __ksym;
  17 /* non-existing symbol, weak, default to zero */
  18 extern const void bpf_link_fops1 __ksym __weak;
  19
  20 SEC("raw_tp/sys_enter")
  21 int handler(const void *ctx)
  22 {
  23         out__bpf_link_fops = (__u64)&bpf_link_fops;
  24         out__btf_size = (__u64)(&__stop_BTF - &__start_BTF);
  25         out__per_cpu_start = (__u64)&__per_cpu_start;
  26
  27         out__bpf_link_fops1 = (__u64)&bpf_link_fops1;
  28
  29         return 0;
  30 }
  31
  32 char _license[] SEC("license") = "GPL";