1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_BTF_IDS_H
#define _LINUX_BTF_IDS_H
#ifdef CONFIG_DEBUG_INFO_BTF
#include <linux/compiler.h> /* for __PASTE */
/*
* Following macros help to define lists of BTF IDs placed
* in .BTF_ids section. They are initially filled with zeros
* (during compilation) and resolved later during the
* linking phase by resolve_btfids tool.
*
* Any change in list layout must be reflected in resolve_btfids
* tool logic.
*/
#define BTF_IDS_SECTION ".BTF_ids"
#define ____BTF_ID(symbol) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
".local " #symbol " ; \n" \
".type " #symbol ", STT_OBJECT; \n" \
".size " #symbol ", 4; \n" \
#symbol ": \n" \
".zero 4 \n" \
".popsection; \n");
#define __BTF_ID(symbol) \
____BTF_ID(symbol)
#define __ID(prefix) \
__PASTE(prefix, __COUNTER__)
/*
* The BTF_ID defines unique symbol for each ID pointing
* to 4 zero bytes.
*/
#define BTF_ID(prefix, name) \
__BTF_ID(__ID(__BTF_ID__##prefix##__##name##__))
/*
* The BTF_ID_LIST macro defines pure (unsorted) list
* of BTF IDs, with following layout:
*
* BTF_ID_LIST(list1)
* BTF_ID(type1, name1)
* BTF_ID(type2, name2)
*
* list1:
* __BTF_ID__type1__name1__1:
* .zero 4
* __BTF_ID__type2__name2__2:
* .zero 4
*
*/
#define __BTF_ID_LIST(name) \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
".local " #name "; \n" \
#name ":; \n" \
".popsection; \n"); \
#define BTF_ID_LIST(name) \
__BTF_ID_LIST(name) \
extern u32 name[];
/*
* The BTF_ID_UNUSED macro defines 4 zero bytes.
* It's used when we want to define 'unused' entry
* in BTF_ID_LIST, like:
*
* BTF_ID_LIST(bpf_skb_output_btf_ids)
* BTF_ID(struct, sk_buff)
* BTF_ID_UNUSED
* BTF_ID(struct, task_struct)
*/
#define BTF_ID_UNUSED \
asm( \
".pushsection " BTF_IDS_SECTION ",\"a\"; \n" \
".zero 4 \n" \
".popsection; \n");
#else
#define BTF_ID_LIST(name) static u32 name[5];
#define BTF_ID(prefix, name)
#define BTF_ID_UNUSED
#endif /* CONFIG_DEBUG_INFO_BTF */
#endif
|
