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