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Linux/tools/include/linux/btf_ids.h

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  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 

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