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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#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) \
23asm( \
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) \
61asm( \
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) \
69extern 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 \
86asm( \
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
120enum {
121#define BTF_SOCK_TYPE(name, str) name,
122BTF_SOCK_TYPE_xxx
123#undef BTF_SOCK_TYPE
124MAX_BTF_SOCK_TYPE,
125};
126
127extern u32 btf_sock_ids[];
128#endif
129
130#endif