[go: up one dir, main page]
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef _LINUX_BTF_IDS_H
4#define _LINUX_BTF_IDS_H
5
6#include <linux/types.h> /* for u32 */
7
8struct btf_id_set {
9 u32 cnt;
10 u32 ids[];
11};
12
13/* This flag implies BTF_SET8 holds kfunc(s) */
14#define BTF_SET8_KFUNCS (1 << 0)
15
16struct btf_id_set8 {
17 u32 cnt;
18 u32 flags;
19 struct {
20 u32 id;
21 u32 flags;
22 } pairs[];
23};
24
25#ifdef CONFIG_DEBUG_INFO_BTF
26
27#include <linux/compiler.h> /* for __PASTE */
28#include <linux/compiler_attributes.h> /* for __maybe_unused */
29#include <linux/stringify.h>
30
31/*
32 * Following macros help to define lists of BTF IDs placed
33 * in .BTF_ids section. They are initially filled with zeros
34 * (during compilation) and resolved later during the
35 * linking phase by resolve_btfids tool.
36 *
37 * Any change in list layout must be reflected in resolve_btfids
38 * tool logic.
39 */
40
41#define BTF_IDS_SECTION ".BTF_ids"
42
43#define ____BTF_ID(symbol, word) \
44asm( \
45".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
46".local " #symbol " ; \n" \
47".type " #symbol ", STT_OBJECT; \n" \
48".size " #symbol ", 4; \n" \
49#symbol ": \n" \
50".zero 4 \n" \
51word \
52".popsection; \n");
53
54#define __BTF_ID(symbol, word) \
55 ____BTF_ID(symbol, word)
56
57#define __ID(prefix) \
58 __PASTE(__PASTE(prefix, __COUNTER__), __LINE__)
59
60/*
61 * The BTF_ID defines unique symbol for each ID pointing
62 * to 4 zero bytes.
63 */
64#define BTF_ID(prefix, name) \
65 __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), "")
66
67#define ____BTF_ID_FLAGS(prefix, name, flags) \
68 __BTF_ID(__ID(__BTF_ID__##prefix##__##name##__), ".long " #flags "\n")
69#define __BTF_ID_FLAGS(prefix, name, flags, ...) \
70 ____BTF_ID_FLAGS(prefix, name, flags)
71#define BTF_ID_FLAGS(prefix, name, ...) \
72 __BTF_ID_FLAGS(prefix, name, ##__VA_ARGS__, 0)
73
74/*
75 * The BTF_ID_LIST macro defines pure (unsorted) list
76 * of BTF IDs, with following layout:
77 *
78 * BTF_ID_LIST(list1)
79 * BTF_ID(type1, name1)
80 * BTF_ID(type2, name2)
81 *
82 * list1:
83 * __BTF_ID__type1__name1__1:
84 * .zero 4
85 * __BTF_ID__type2__name2__2:
86 * .zero 4
87 *
88 */
89#define __BTF_ID_LIST(name, scope) \
90asm( \
91".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
92"." #scope " " #name "; \n" \
93#name ":; \n" \
94".popsection; \n");
95
96#define BTF_ID_LIST(name) \
97__BTF_ID_LIST(name, local) \
98extern u32 name[];
99
100#define BTF_ID_LIST_GLOBAL(name, n) \
101__BTF_ID_LIST(name, globl)
102
103/* The BTF_ID_LIST_SINGLE macro defines a BTF_ID_LIST with
104 * a single entry.
105 */
106#define BTF_ID_LIST_SINGLE(name, prefix, typename) \
107 BTF_ID_LIST(name) \
108 BTF_ID(prefix, typename)
109#define BTF_ID_LIST_GLOBAL_SINGLE(name, prefix, typename) \
110 BTF_ID_LIST_GLOBAL(name, 1) \
111 BTF_ID(prefix, typename)
112
113/*
114 * The BTF_ID_UNUSED macro defines 4 zero bytes.
115 * It's used when we want to define 'unused' entry
116 * in BTF_ID_LIST, like:
117 *
118 * BTF_ID_LIST(bpf_skb_output_btf_ids)
119 * BTF_ID(struct, sk_buff)
120 * BTF_ID_UNUSED
121 * BTF_ID(struct, task_struct)
122 */
123
124#define BTF_ID_UNUSED \
125asm( \
126".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
127".zero 4 \n" \
128".popsection; \n");
129
130/*
131 * The BTF_SET_START/END macros pair defines sorted list of
132 * BTF IDs plus its members count, with following layout:
133 *
134 * BTF_SET_START(list)
135 * BTF_ID(type1, name1)
136 * BTF_ID(type2, name2)
137 * BTF_SET_END(list)
138 *
139 * __BTF_ID__set__list:
140 * .zero 4
141 * list:
142 * __BTF_ID__type1__name1__3:
143 * .zero 4
144 * __BTF_ID__type2__name2__4:
145 * .zero 4
146 *
147 */
148#define __BTF_SET_START(name, scope) \
149asm( \
150".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
151"." #scope " __BTF_ID__set__" #name "; \n" \
152"__BTF_ID__set__" #name ":; \n" \
153".zero 4 \n" \
154".popsection; \n");
155
156#define BTF_SET_START(name) \
157__BTF_ID_LIST(name, local) \
158__BTF_SET_START(name, local)
159
160#define BTF_SET_START_GLOBAL(name) \
161__BTF_ID_LIST(name, globl) \
162__BTF_SET_START(name, globl)
163
164#define BTF_SET_END(name) \
165asm( \
166".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
167".size __BTF_ID__set__" #name ", .-" #name " \n" \
168".popsection; \n"); \
169extern struct btf_id_set name;
170
171/*
172 * The BTF_SET8_START/END macros pair defines sorted list of
173 * BTF IDs and their flags plus its members count, with the
174 * following layout:
175 *
176 * BTF_SET8_START(list)
177 * BTF_ID_FLAGS(type1, name1, flags)
178 * BTF_ID_FLAGS(type2, name2, flags)
179 * BTF_SET8_END(list)
180 *
181 * __BTF_ID__set8__list:
182 * .zero 8
183 * list:
184 * __BTF_ID__type1__name1__3:
185 * .zero 4
186 * .word (1 << 0) | (1 << 2)
187 * __BTF_ID__type2__name2__5:
188 * .zero 4
189 * .word (1 << 3) | (1 << 1) | (1 << 2)
190 *
191 */
192#define __BTF_SET8_START(name, scope, flags) \
193__BTF_ID_LIST(name, local) \
194asm( \
195".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
196"." #scope " __BTF_ID__set8__" #name "; \n" \
197"__BTF_ID__set8__" #name ":; \n" \
198".zero 4 \n" \
199".long " __stringify(flags) "\n" \
200".popsection; \n");
201
202#define BTF_SET8_START(name) \
203__BTF_SET8_START(name, local, 0)
204
205#define BTF_SET8_END(name) \
206asm( \
207".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
208".size __BTF_ID__set8__" #name ", .-" #name " \n" \
209".popsection; \n"); \
210extern struct btf_id_set8 name;
211
212#define BTF_KFUNCS_START(name) \
213__BTF_SET8_START(name, local, BTF_SET8_KFUNCS)
214
215#define BTF_KFUNCS_END(name) \
216BTF_SET8_END(name)
217
218#else
219
220#define BTF_ID_LIST(name) static u32 __maybe_unused name[64];
221#define BTF_ID(prefix, name)
222#define BTF_ID_FLAGS(prefix, name, ...)
223#define BTF_ID_UNUSED
224#define BTF_ID_LIST_GLOBAL(name, n) u32 __maybe_unused name[n];
225#define BTF_ID_LIST_SINGLE(name, prefix, typename) static u32 __maybe_unused name[1];
226#define BTF_ID_LIST_GLOBAL_SINGLE(name, prefix, typename) u32 __maybe_unused name[1];
227#define BTF_SET_START(name) static struct btf_id_set __maybe_unused name = { 0 };
228#define BTF_SET_START_GLOBAL(name) static struct btf_id_set __maybe_unused name = { 0 };
229#define BTF_SET_END(name)
230#define BTF_SET8_START(name) static struct btf_id_set8 __maybe_unused name = { 0 };
231#define BTF_SET8_END(name)
232#define BTF_KFUNCS_START(name) static struct btf_id_set8 __maybe_unused name = { .flags = BTF_SET8_KFUNCS };
233#define BTF_KFUNCS_END(name)
234
235#endif /* CONFIG_DEBUG_INFO_BTF */
236
237#ifdef CONFIG_NET
238/* Define a list of socket types which can be the argument for
239 * skc_to_*_sock() helpers. All these sockets should have
240 * sock_common as the first argument in its memory layout.
241 */
242#define BTF_SOCK_TYPE_xxx \
243 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET, inet_sock) \
244 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_CONN, inet_connection_sock) \
245 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_REQ, inet_request_sock) \
246 BTF_SOCK_TYPE(BTF_SOCK_TYPE_INET_TW, inet_timewait_sock) \
247 BTF_SOCK_TYPE(BTF_SOCK_TYPE_REQ, request_sock) \
248 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK, sock) \
249 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCK_COMMON, sock_common) \
250 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP, tcp_sock) \
251 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_REQ, tcp_request_sock) \
252 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP_TW, tcp_timewait_sock) \
253 BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \
254 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \
255 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock) \
256 BTF_SOCK_TYPE(BTF_SOCK_TYPE_UNIX, unix_sock) \
257 BTF_SOCK_TYPE(BTF_SOCK_TYPE_MPTCP, mptcp_sock) \
258 BTF_SOCK_TYPE(BTF_SOCK_TYPE_SOCKET, socket)
259
260enum {
261#define BTF_SOCK_TYPE(name, str) name,
262BTF_SOCK_TYPE_xxx
263#undef BTF_SOCK_TYPE
264MAX_BTF_SOCK_TYPE,
265};
266
267extern u32 btf_sock_ids[];
268#endif
269
270#define BTF_TRACING_TYPE_xxx \
271 BTF_TRACING_TYPE(BTF_TRACING_TYPE_TASK, task_struct) \
272 BTF_TRACING_TYPE(BTF_TRACING_TYPE_FILE, file) \
273 BTF_TRACING_TYPE(BTF_TRACING_TYPE_VMA, vm_area_struct)
274
275enum {
276#define BTF_TRACING_TYPE(name, type) name,
277BTF_TRACING_TYPE_xxx
278#undef BTF_TRACING_TYPE
279MAX_BTF_TRACING_TYPE,
280};
281
282extern u32 btf_tracing_ids[];
283extern u32 bpf_cgroup_btf_id[];
284extern u32 bpf_local_storage_map_btf_id[];
285extern u32 btf_bpf_map_id[];
286extern u32 bpf_kmem_cache_btf_id[];
287
288#endif
289

source code of linux/include/linux/btf_ids.h