1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef _LINUX_BTF_IDS_H 4 #define _LINUX_BTF_IDS_H 5 6 struct btf_id_set { 7 u32 cnt; 8 u32 ids[]; 9 }; 10 11 struct btf_id_set8 { 12 u32 cnt; 13 u32 flags; 14 struct { 15 u32 id; 16 u32 flags; 17 } pairs[]; 18 }; 19 20 #ifdef CONFIG_DEBUG_INFO_BTF 21 22 #include <linux/compiler.h> /* for __PASTE */ 23 24 /* 25 * Following macros help to define lists of BTF IDs placed 26 * in .BTF_ids section. They are initially filled with zeros 27 * (during compilation) and resolved later during the 28 * linking phase by resolve_btfids tool. 29 * 30 * Any change in list layout must be reflected in resolve_btfids 31 * tool logic. 32 */ 33 34 #define BTF_IDS_SECTION ".BTF_ids" 35 36 #define ____BTF_ID(symbol) \ 37 asm( \ 38 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 39 ".local " #symbol " ; \n" \ 40 ".type " #symbol ", STT_OBJECT; \n" \ 41 ".size " #symbol ", 4; \n" \ 42 #symbol ": \n" \ 43 ".zero 4 \n" \ 44 ".popsection; \n"); 45 46 #define __BTF_ID(symbol) \ 47 ____BTF_ID(symbol) 48 49 #define __ID(prefix) \ 50 __PASTE(__PASTE(prefix, __COUNTER__), __LINE__) 51 52 /* 53 * The BTF_ID defines unique symbol for each ID pointing 54 * to 4 zero bytes. 55 */ 56 #define BTF_ID(prefix, name) \ 57 __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__)) 58 59 /* 60 * The BTF_ID_LIST macro defines pure (unsorted) list 61 * of BTF IDs, with following layout: 62 * 63 * BTF_ID_LIST(list1) 64 * BTF_ID(type1, name1) 65 * BTF_ID(type2, name2) 66 * 67 * list1: 68 * __BTF_ID__type1__name1__1: 69 * .zero 4 70 * __BTF_ID__type2__name2__2: 71 * .zero 4 72 * 73 */ 74 #define __BTF_ID_LIST(name, scope) \ 75 asm( \ 76 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 77 "." #scope " " #name "; \n" \ 78 #name ":; \n" \ 79 ".popsection; \n"); 80 81 #define BTF_ID_LIST(name) \ 82 __BTF_ID_LIST(name, local) \ 83 extern u32 name[]; 84 85 #define BTF_ID_LIST_GLOBAL(name, n) \ 86 __BTF_ID_LIST(name, globl) 87 88 /* The BTF_ID_LIST_SINGLE macro defines a BTF_ID_LIST with 89 * a single entry. 90 */ 91 #define BTF_ID_LIST_SINGLE(name, prefix, typename) \ 92 BTF_ID_LIST(name) \ 93 BTF_ID(prefix, typename) 94 #define BTF_ID_LIST_GLOBAL_SINGLE(name, prefix, typename) \ 95 BTF_ID_LIST_GLOBAL(name, 1) \ 96 BTF_ID(prefix, typename) 97 98 /* 99 * The BTF_ID_UNUSED macro defines 4 zero bytes. 100 * It's used when we want to define 'unused' entry 101 * in BTF_ID_LIST, like: 102 * 103 * BTF_ID_LIST(bpf_skb_output_btf_ids) 104 * BTF_ID(struct, sk_buff) 105 * BTF_ID_UNUSED 106 * BTF_ID(struct, task_struct) 107 */ 108 109 #define BTF_ID_UNUSED \ 110 asm( \ 111 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 112 ".zero 4 \n" \ 113 ".popsection; \n"); 114 115 /* 116 * The BTF_SET_START/END macros pair defines sorted list of 117 * BTF IDs plus its members count, with following layout: 118 * 119 * BTF_SET_START(list) 120 * BTF_ID(type1, name1) 121 * BTF_ID(type2, name2) 122 * BTF_SET_END(list) 123 * 124 * __BTF_ID__set__list: 125 * .zero 4 126 * list: 127 * __BTF_ID__type1__name1__3: 128 * .zero 4 129 * __BTF_ID__type2__name2__4: 130 * .zero 4 131 * 132 */ 133 #define __BTF_SET_START(name, scope) \ 134 asm( \ 135 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 136 "." #scope " __BTF_ID__set__" #name "; \n" \ 137 "__BTF_ID__set__" #name ":; \n" \ 138 ".zero 4 \n" \ 139 ".popsection; \n"); 140 141 #define BTF_SET_START(name) \ 142 __BTF_ID_LIST(name, local) \ 143 __BTF_SET_START(name, local) 144 145 #define BTF_SET_START_GLOBAL(name) \ 146 __BTF_ID_LIST(name, globl) \ 147 __BTF_SET_START(name, globl) 148 149 #define BTF_SET_END(name) \ 150 asm( \ 151 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 152 ".size __BTF_ID__set__" #name ", .-" #name " \n" \ 153 ".popsection; \n"); \ 154 extern struct btf_id_set name; 155 156 #else 157 158 #define BTF_ID_LIST(name) static u32 __maybe_unused name[5]; 159 #define BTF_ID(prefix, name) 160 #define BTF_ID_UNUSED 161 #define BTF_ID_LIST_GLOBAL(name, n) u32 __maybe_unused name[n]; 162 #define BTF_ID_LIST_SINGLE(name, prefix, typename) static u32 __maybe_unused name[1]; 163 #define BTF_ID_LIST_GLOBAL_SINGLE(name, prefix, typename) u32 __maybe_unused name[1]; 164 #define BTF_SET_START(name) static struct btf_id_set __maybe_unused name = { 0 }; 165 #define BTF_SET_START_GLOBAL(name) static struct btf_id_set __maybe_unused name = { 0 }; 166 #define BTF_SET_END(name) 167 168 #endif /* CONFIG_DEBUG_INFO_BTF */ 169 170 #ifdef CONFIG_NET 171 /* Define a list of socket types which can be the argument for 172 * skc_to_*_sock() helpers. All these sockets should have 173 * sock_common as the first argument in its memory layout. 174 */ 175 #define BTF_SOCK_TYPE_xxx \ 176 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock) \ 177 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock) \ 178 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock) \ 179 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \ 180 BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock) \ 181 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock) \ 182 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common) \ 183 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock) \ 184 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock) \ 185 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock) \ 186 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \ 187 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \ 188 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock) \ 189 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UNIX, unix_sock) \ 190 BTF_SOCK_TYPE(BTF_SOCK_TYPE_MPTCP, mptcp_sock) \ 191 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCKET, socket) 192 193 enum { 194 #define BTF_SOCK_TYPE(name, str) name, 195 BTF_SOCK_TYPE_xxx 196 #undef BTF_SOCK_TYPE 197 MAX_BTF_SOCK_TYPE, 198 }; 199 200 extern u32 btf_sock_ids[]; 201 #endif 202 203 #define BTF_TRACING_TYPE_xxx \ 204 BTF_TRACING_TYPE(BTF_TRACING_TYPE_TASK, task_struct) \ 205 BTF_TRACING_TYPE(BTF_TRACING_TYPE_FILE, file) \ 206 BTF_TRACING_TYPE(BTF_TRACING_TYPE_VMA, vm_area_struct) 207 208 enum { 209 #define BTF_TRACING_TYPE(name, type) name, 210 BTF_TRACING_TYPE_xxx 211 #undef BTF_TRACING_TYPE 212 MAX_BTF_TRACING_TYPE, 213 }; 214 215 extern u32 btf_tracing_ids[]; 216 217 #endif 218