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/bpf_helpers.h> 7 #include <bpf/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_nesting_substruct { 17 int a; 18 }; 19 20 union core_reloc_nesting_subunion { 21 int b; 22 }; 23 24 /* int a.a.a and b.b.b accesses */ 25 struct core_reloc_nesting { 26 union { 27 struct core_reloc_nesting_substruct a; 28 } a; 29 struct { 30 union core_reloc_nesting_subunion b; 31 } b; 32 }; 33 34 #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src) 35 36 SEC("raw_tracepoint/sys_enter") test_core_nesting(void * ctx)37int test_core_nesting(void *ctx) 38 { 39 struct core_reloc_nesting *in = (void *)&data.in; 40 struct core_reloc_nesting *out = (void *)&data.out; 41 42 if (CORE_READ(&out->a.a.a, &in->a.a.a)) 43 return 1; 44 if (CORE_READ(&out->b.b.b, &in->b.b.b)) 45 return 1; 46 47 return 0; 48 } 49 50