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

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2019 Facebook
   3
   4 #include <linux/bpf.h>
   5 #include <stdint.h>
   6 #include "bpf_helpers.h"
   7 #include "bpf_core_read.h"
   8
   9 char _license[] SEC("license") = "GPL";
  10
  11 struct {
  12         char in[256];
  13         char out[256];
  14 } data = {};
  15
  16 struct core_reloc_ptr_as_arr {
  17         int a;
  18 };
  19
  20 #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src)
  21
  22 SEC("raw_tracepoint/sys_enter")
  23 int test_core_ptr_as_arr(void *ctx)
  24 {
  25         struct core_reloc_ptr_as_arr *in = (void *)&data.in;
  26         struct core_reloc_ptr_as_arr *out = (void *)&data.out;
  27
  28         if (CORE_READ(&out->a, &in[2].a))
  29                 return 1;
  30
  31         return 0;
  32 }
  33