Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef PERF_LINUX_LINKAGE_H_
4#define PERF_LINUX_LINKAGE_H_
5
6/* linkage.h ... for including arch/x86/lib/memcpy_64.S */
7
8/* Some toolchains use other characters (e.g. '`') to mark new line in macro */
9#ifndef ASM_NL
10#define ASM_NL ;
11#endif
12
13#ifndef __ALIGN
14#define __ALIGN .align 4,0x90
15#define __ALIGN_STR ".align 4,0x90"
16#endif
17
18/* SYM_T_FUNC -- type used by assembler to mark functions */
19#ifndef SYM_T_FUNC
20#define SYM_T_FUNC STT_FUNC
21#endif
22
23/* SYM_A_* -- align the symbol? */
24#define SYM_A_ALIGN ALIGN
25
26/* SYM_L_* -- linkage of symbols */
27#define SYM_L_GLOBAL(name) .globl name
28#define SYM_L_WEAK(name) .weak name
29#define SYM_L_LOCAL(name) /* nothing */
30
31#define ALIGN __ALIGN
32
33/* === generic annotations === */
34
35/* SYM_ENTRY -- use only if you have to for non-paired symbols */
36#ifndef SYM_ENTRY
37#define SYM_ENTRY(name, linkage, align...) \
38 linkage(name) ASM_NL \
39 align ASM_NL \
40 name:
41#endif
42
43/* SYM_START -- use only if you have to */
44#ifndef SYM_START
45#define SYM_START(name, linkage, align...) \
46 SYM_ENTRY(name, linkage, align)
47#endif
48
49/* SYM_END -- use only if you have to */
50#ifndef SYM_END
51#define SYM_END(name, sym_type) \
52 .type name sym_type ASM_NL \
53 .set .L__sym_size_##name, .-name ASM_NL \
54 .size name, .-name
55#endif
56
57/* SYM_ALIAS -- use only if you have to */
58#ifndef SYM_ALIAS
59#define SYM_ALIAS(alias, name, sym_type, linkage) \
60 linkage(alias) ASM_NL \
61 .set alias, name ASM_NL \
62 .type alias sym_type ASM_NL \
63 .set .L__sym_size_##alias, .L__sym_size_##name ASM_NL \
64 .size alias, .L__sym_size_##alias
65#endif
66
67/* SYM_FUNC_START -- use for global functions */
68#ifndef SYM_FUNC_START
69#define SYM_FUNC_START(name) \
70 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
71#endif
72
73/* SYM_FUNC_START_LOCAL -- use for local functions */
74#ifndef SYM_FUNC_START_LOCAL
75#define SYM_FUNC_START_LOCAL(name) \
76 SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)
77#endif
78
79/* SYM_FUNC_START_WEAK -- use for weak functions */
80#ifndef SYM_FUNC_START_WEAK
81#define SYM_FUNC_START_WEAK(name) \
82 SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)
83#endif
84
85/*
86 * SYM_FUNC_END -- the end of SYM_FUNC_START_LOCAL, SYM_FUNC_START,
87 * SYM_FUNC_START_WEAK, ...
88 */
89#ifndef SYM_FUNC_END
90#define SYM_FUNC_END(name) \
91 SYM_END(name, SYM_T_FUNC)
92#endif
93
94/*
95 * SYM_FUNC_ALIAS -- define a global alias for an existing function
96 */
97#ifndef SYM_FUNC_ALIAS
98#define SYM_FUNC_ALIAS(alias, name) \
99 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_GLOBAL)
100#endif
101
102/*
103 * SYM_FUNC_ALIAS_LOCAL -- define a local alias for an existing function
104 */
105#ifndef SYM_FUNC_ALIAS_LOCAL
106#define SYM_FUNC_ALIAS_LOCAL(alias, name) \
107 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_LOCAL)
108#endif
109
110/*
111 * SYM_FUNC_ALIAS_WEAK -- define a weak global alias for an existing function
112 */
113#ifndef SYM_FUNC_ALIAS_WEAK
114#define SYM_FUNC_ALIAS_WEAK(alias, name) \
115 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_WEAK)
116#endif
117
118#ifndef SYM_FUNC_ALIAS_MEMFUNC
119#define SYM_FUNC_ALIAS_MEMFUNC SYM_FUNC_ALIAS
120#endif
121
122// In the kernel sources (include/linux/cfi_types.h), this has a different
123// definition when CONFIG_CFI is used, for tools/ just use the !cfi
124// definition:
125#ifndef SYM_TYPED_START
126#define SYM_TYPED_START(name, linkage, align...) \
127 SYM_START(name, linkage, align)
128#endif
129
130#ifndef SYM_TYPED_FUNC_START
131#define SYM_TYPED_FUNC_START(name) \
132 SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
133#endif
134
135#ifndef SYM_PIC_ALIAS
136#define SYM_PIC_ALIAS(sym) SYM_ALIAS(__pi_ ## sym, sym, SYM_T_FUNC, SYM_L_GLOBAL)
137#endif
138
139#endif /* PERF_LINUX_LINKAGE_H_ */