1// SPDX-License-Identifier: GPL-2.0 2// Copyright (c) 2020 Facebook 3 4#include <linux/bpf.h> 5#include <stdint.h> 6#include <stdbool.h> 7#include <bpf/bpf_helpers.h> 8#include <bpf/bpf_core_read.h> 9 10char _license[] SEC("license") = "GPL"; 11 12struct { 13 char in[256]; 14 char out[256]; 15 bool skip; 16} data = {}; 17 18/* some types are shared with test_core_reloc_type_based.c */ 19struct a_struct { 20 int x; 21}; 22 23union a_union { 24 int y; 25 int z; 26}; 27 28enum an_enum { 29 AN_ENUM_VAL1 = 1, 30 AN_ENUM_VAL2 = 2, 31 AN_ENUM_VAL3 = 3, 32}; 33 34typedef struct a_struct named_struct_typedef; 35 36typedef int (*func_proto_typedef)(long); 37 38typedef char arr_typedef[20]; 39 40struct core_reloc_type_id_output { 41 int local_anon_struct; 42 int local_anon_union; 43 int local_anon_enum; 44 int local_anon_func_proto_ptr; 45 int local_anon_void_ptr; 46 int local_anon_arr; 47 48 int local_struct; 49 int local_union; 50 int local_enum; 51 int local_int; 52 int local_struct_typedef; 53 int local_func_proto_typedef; 54 int local_arr_typedef; 55 56 int targ_struct; 57 int targ_union; 58 int targ_enum; 59 int targ_int; 60 int targ_struct_typedef; 61 int targ_func_proto_typedef; 62 int targ_arr_typedef; 63}; 64 65/* preserve types even if Clang doesn't support built-in */ 66struct a_struct t1 = {}; 67union a_union t2 = {}; 68enum an_enum t3 = 0; 69named_struct_typedef t4 = {}; 70func_proto_typedef t5 = 0; 71arr_typedef t6 = {}; 72 73SEC("raw_tracepoint/sys_enter") 74int test_core_type_id(void *ctx) 75{ 76 /* We use __builtin_btf_type_id() in this tests, but up until the time 77 * __builtin_preserve_type_info() was added it contained a bug that 78 * would make this test fail. The bug was fixed ([0]) with addition of 79 * __builtin_preserve_type_info(), though, so that's what we are using 80 * to detect whether this test has to be executed, however strange 81 * that might look like. 82 * 83 * [0] https://reviews.llvm.org/D85174 84 */ 85#if __has_builtin(__builtin_preserve_type_info) 86 struct core_reloc_type_id_output *out = (void *)&data.out; 87 88 out->local_anon_struct = bpf_core_type_id_local(struct { int marker_field; }); 89 out->local_anon_union = bpf_core_type_id_local(union { int marker_field; }); 90 out->local_anon_enum = bpf_core_type_id_local(enum { MARKER_ENUM_VAL = 123 }); 91 out->local_anon_func_proto_ptr = bpf_core_type_id_local(_Bool(*)(int)); 92 out->local_anon_void_ptr = bpf_core_type_id_local(void *); 93 out->local_anon_arr = bpf_core_type_id_local(_Bool[47]); 94 95 out->local_struct = bpf_core_type_id_local(struct a_struct); 96 out->local_union = bpf_core_type_id_local(union a_union); 97 out->local_enum = bpf_core_type_id_local(enum an_enum); 98 out->local_int = bpf_core_type_id_local(int); 99 out->local_struct_typedef = bpf_core_type_id_local(named_struct_typedef); 100 out->local_func_proto_typedef = bpf_core_type_id_local(func_proto_typedef); 101 out->local_arr_typedef = bpf_core_type_id_local(arr_typedef); 102 103 out->targ_struct = bpf_core_type_id_kernel(struct a_struct); 104 out->targ_union = bpf_core_type_id_kernel(union a_union); 105 out->targ_enum = bpf_core_type_id_kernel(enum an_enum); 106 out->targ_int = bpf_core_type_id_kernel(int); 107 out->targ_struct_typedef = bpf_core_type_id_kernel(named_struct_typedef); 108 out->targ_func_proto_typedef = bpf_core_type_id_kernel(func_proto_typedef); 109 out->targ_arr_typedef = bpf_core_type_id_kernel(arr_typedef); 110#else 111 data.skip = true; 112#endif 113 114 return 0; 115} 116