Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef __ASM_GENERIC_EXPORT_H
3#define __ASM_GENERIC_EXPORT_H
4
5#ifndef KSYM_FUNC
6#define KSYM_FUNC(x) x
7#endif
8#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
9#define KSYM_ALIGN 4
10#elif defined(CONFIG_64BIT)
11#define KSYM_ALIGN 8
12#else
13#define KSYM_ALIGN 4
14#endif
15#ifndef KCRC_ALIGN
16#define KCRC_ALIGN 4
17#endif
18
19.macro __put, val, name
20#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
21 .long \val - ., \name - ., 0
22#elif defined(CONFIG_64BIT)
23 .quad \val, \name, 0
24#else
25 .long \val, \name, 0
26#endif
27.endm
28
29/*
30 * note on .section use: @progbits vs %progbits nastiness doesn't matter,
31 * since we immediately emit into those sections anyway.
32 */
33.macro ___EXPORT_SYMBOL name,val,sec
34#ifdef CONFIG_MODULES
35 .section ___ksymtab\sec+\name,"a"
36 .balign KSYM_ALIGN
37__ksymtab_\name:
38 __put \val, __kstrtab_\name
39 .previous
40 .section __ksymtab_strings,"a"
41__kstrtab_\name:
42 .asciz "\name"
43 .previous
44#ifdef CONFIG_MODVERSIONS
45 .section ___kcrctab\sec+\name,"a"
46 .balign KCRC_ALIGN
47#if defined(CONFIG_MODULE_REL_CRCS)
48 .long __crc_\name - .
49#else
50 .long __crc_\name
51#endif
52 .weak __crc_\name
53 .previous
54#endif
55#endif
56.endm
57
58#if defined(CONFIG_TRIM_UNUSED_KSYMS)
59
60#include <linux/kconfig.h>
61#include <generated/autoksyms.h>
62
63.macro __ksym_marker sym
64 .section ".discard.ksym","a"
65__ksym_marker_\sym:
66 .previous
67.endm
68
69#define __EXPORT_SYMBOL(sym, val, sec) \
70 __ksym_marker sym; \
71 __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
72#define __cond_export_sym(sym, val, sec, conf) \
73 ___cond_export_sym(sym, val, sec, conf)
74#define ___cond_export_sym(sym, val, sec, enabled) \
75 __cond_export_sym_##enabled(sym, val, sec)
76#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
77#define __cond_export_sym_0(sym, val, sec) /* nothing */
78
79#else
80#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
81#endif
82
83#define EXPORT_SYMBOL(name) \
84 __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
85#define EXPORT_SYMBOL_GPL(name) \
86 __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
87#define EXPORT_DATA_SYMBOL(name) \
88 __EXPORT_SYMBOL(name, name,)
89#define EXPORT_DATA_SYMBOL_GPL(name) \
90 __EXPORT_SYMBOL(name, name,_gpl)
91
92#endif