1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef _LINUX_BTF_IDS_H 4 #define _LINUX_BTF_IDS_H 5 6 #ifdef CONFIG_DEBUG_INFO_BTF 7 8 #include <linux/compiler.h> /* for __PASTE */ 9 10 /* 11 * Following macros help to define lists of BTF IDs placed 12 * in .BTF_ids section. They are initially filled with zeros 13 * (during compilation) and resolved later during the 14 * linking phase by resolve_btfids tool. 15 * 16 * Any change in list layout must be reflected in resolve_btfids 17 * tool logic. 18 */ 19 20 #define BTF_IDS_SECTION ".BTF_ids" 21 22 #define ____BTF_ID(symbol) \ 23 asm( \ 24 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 25 ".local " #symbol " ; \n" \ 26 ".type " #symbol ", STT_OBJECT; \n" \ 27 ".size " #symbol ", 4; \n" \ 28 #symbol ": \n" \ 29 ".zero 4 \n" \ 30 ".popsection; \n"); 31 32 #define __BTF_ID(symbol) \ 33 ____BTF_ID(symbol) 34 35 #define __ID(prefix) \ 36 __PASTE(prefix, __COUNTER__) 37 38 /* 39 * The BTF_ID defines unique symbol for each ID pointing 40 * to 4 zero bytes. 41 */ 42 #define BTF_ID(prefix, name) \ 43 __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__)) 44 45 /* 46 * The BTF_ID_LIST macro defines pure (unsorted) list 47 * of BTF IDs, with following layout: 48 * 49 * BTF_ID_LIST(list1) 50 * BTF_ID(type1, name1) 51 * BTF_ID(type2, name2) 52 * 53 * list1: 54 * __BTF_ID__type1__name1__1: 55 * .zero 4 56 * __BTF_ID__type2__name2__2: 57 * .zero 4 58 * 59 */ 60 #define __BTF_ID_LIST(name, scope) \ 61 asm( \ 62 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 63 "." #scope " " #name "; \n" \ 64 #name ":; \n" \ 65 ".popsection; \n"); \ 66 67 #define BTF_ID_LIST(name) \ 68 __BTF_ID_LIST(name, local) \ 69 extern u32 name[]; 70 71 #define BTF_ID_LIST_GLOBAL(name) \ 72 __BTF_ID_LIST(name, globl) 73 74 /* 75 * The BTF_ID_UNUSED macro defines 4 zero bytes. 76 * It's used when we want to define 'unused' entry 77 * in BTF_ID_LIST, like: 78 * 79 * BTF_ID_LIST(bpf_skb_output_btf_ids) 80 * BTF_ID(struct, sk_buff) 81 * BTF_ID_UNUSED 82 * BTF_ID(struct, task_struct) 83 */ 84 85 #define BTF_ID_UNUSED \ 86 asm( \ 87 ".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \ 88 ".zero 4 \n" \ 89 ".popsection; \n"); 90 91 #else 92 93 #define BTF_ID_LIST(name) static u32 name[5]; 94 #define BTF_ID(prefix, name) 95 #define BTF_ID_UNUSED 96 #define BTF_ID_LIST_GLOBAL(name) u32 name[1]; 97 98 #endif /* CONFIG_DEBUG_INFO_BTF */ 99 100 #ifdef CONFIG_NET 101 /* Define a list of socket types which can be the argument for 102 * skc_to_*_sock() helpers. All these sockets should have 103 * sock_common as the first argument in its memory layout. 104 */ 105 #define BTF_SOCK_TYPE_xxx \ 106 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock) \ 107 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock) \ 108 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock) \ 109 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \ 110 BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock) \ 111 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock) \ 112 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common) \ 113 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock) \ 114 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock) \ 115 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock) \ 116 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \ 117 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \ 118 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock) 119 120 enum { 121 #define BTF_SOCK_TYPE(name, str) name, 122 BTF_SOCK_TYPE_xxx 123 #undef BTF_SOCK_TYPE 124 MAX_BTF_SOCK_TYPE, 125 }; 126 127 extern u32 btf_sock_ids[]; 128 #endif 129 130 #endif 131