1 /* coreout.h - Declarations and definitions related to 2 BPF Compile Once - Run Everywhere (CO-RE) support. 3 Copyright (C) 2021-2022 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, but 13 WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 22 #ifndef __COREOUT_H 23 #define __COREOUT_H 24 25 #include <stdint.h> 26 27 #ifdef __cplusplus 28 extern "C" 29 { 30 #endif 31 32 /* .BTF.ext information. */ 33 34 struct btf_ext_section_header 35 { 36 uint32_t sec_name_off; 37 uint32_t num_records; 38 }; 39 40 /* A funcinfo record, in the .BTF.ext funcinfo section. */ 41 struct btf_ext_funcinfo 42 { 43 uint32_t insn_off; /* Offset of the first instruction of the function. */ 44 uint32_t type; /* Type ID of a BTF_KIND_FUNC type. */ 45 }; 46 47 /* A lineinfo record, in the .BTF.ext lineinfo section. */ 48 struct btf_ext_lineinfo 49 { 50 uint32_t insn_off; /* Offset of the instruction. */ 51 uint32_t file_name_off; /* Offset of file name in BTF string table. */ 52 uint32_t line_off; /* Offset of source line in BTF string table. */ 53 uint32_t line_col; /* Line number (bits 31-11) and column (11-0). */ 54 }; 55 56 enum btf_core_reloc_kind 57 { 58 BPF_RELO_FIELD_BYTE_OFFSET = 0, 59 BPF_RELO_FIELD_BYTE_SIZE = 1, 60 BPF_RELO_FIELD_EXISTS = 2, 61 BPF_RELO_FIELD_SIGNED = 3, 62 BPF_RELO_FIELD_LSHIFT_U64 = 4, 63 BPF_RELO_FIELD_RSHIFT_U64 = 5, 64 BPF_RELO_TYPE_ID_LOCAL = 6, 65 BPF_RELO_TYPE_ID_TARGET = 7, 66 BPF_RELO_TYPE_EXISTS = 8, 67 BPF_RELO_TYPE_SIZE = 9, 68 BPF_RELO_ENUMVAL_EXISTS = 10, 69 BPF_RELO_ENUMVAL_VALUE = 11 70 }; 71 72 struct btf_ext_reloc 73 { 74 uint32_t insn_off; /* Offset of instruction to be patched. A 75 section-relative label at compile time. */ 76 uint32_t type_id; /* Type ID of the outermost containing entity, e.g. 77 the containing structure. */ 78 uint32_t access_str_off; /* Offset of CO-RE accessor string in .BTF strings 79 section. */ 80 uint32_t kind; /* An enum btf_core_reloc_kind. Note that it always 81 takes 32 bits. */ 82 }; 83 84 struct btf_ext_header 85 { 86 uint16_t magic; /* Magic number (BTF_MAGIC). */ 87 uint8_t version; /* Data format version (BTF_VERSION). */ 88 uint8_t flags; /* Flags. Currently unused. */ 89 uint32_t hdr_len; /* Length of this header in bytes. */ 90 91 /* Following offsets are relative to the end of this header, in bytes. 92 Following lengths are in bytes. */ 93 uint32_t func_info_off; /* Offset of funcinfo section. */ 94 uint32_t func_info_len; /* Length of funcinfo section. */ 95 uint32_t line_info_off; /* Offset of lineinfo section. */ 96 uint32_t line_info_len; /* Length of lineinfo section. */ 97 98 uint32_t core_relo_off; /* Offset of CO-RE relocation section. */ 99 uint32_t core_relo_len; /* Length of CO-RE relocation section. */ 100 }; 101 102 extern void btf_ext_init (void); 103 extern void btf_ext_output (void); 104 105 extern void bpf_core_reloc_add (const tree, const char *, vec<unsigned int> *, 106 rtx_code_label *); 107 extern int bpf_core_get_sou_member_index (ctf_container_ref, const tree); 108 109 #ifdef __cplusplus 110 } 111 #endif 112 113 #endif /* __COREOUT_H */ 114