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