Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef _LINUX_EXPORT_H
3#define _LINUX_EXPORT_H
4
5#include <linux/compiler.h>
6#include <linux/linkage.h>
7#include <linux/stringify.h>
8
9/*
10 * Export symbols from the kernel to modules. Forked from module.h
11 * to reduce the amount of pointless cruft we feed to gcc when only
12 * exporting a simple symbol or two.
13 *
14 * Try not to add #includes here. It slows compilation and makes kernel
15 * hackers place grumpy comments in header files.
16 */
17
18/*
19 * This comment block is used by fixdep. Please do not remove.
20 *
21 * When CONFIG_MODVERSIONS is changed from n to y, all source files having
22 * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
23 * side effect of the *.o build rule.
24 */
25
26#ifndef __ASSEMBLY__
27#ifdef MODULE
28extern struct module __this_module;
29#define THIS_MODULE (&__this_module)
30#else
31#define THIS_MODULE ((struct module *)0)
32#endif
33#endif /* __ASSEMBLY__ */
34
35#ifdef CONFIG_64BIT
36#define __EXPORT_SYMBOL_REF(sym) \
37 .balign 8 ASM_NL \
38 .quad sym
39#else
40#define __EXPORT_SYMBOL_REF(sym) \
41 .balign 4 ASM_NL \
42 .long sym
43#endif
44
45#define ___EXPORT_SYMBOL(sym, license, ns) \
46 .section ".export_symbol","a" ASM_NL \
47 __export_symbol_##sym: ASM_NL \
48 .asciz license ASM_NL \
49 .asciz ns ASM_NL \
50 __EXPORT_SYMBOL_REF(sym) ASM_NL \
51 .previous
52
53#if defined(__DISABLE_EXPORTS)
54
55/*
56 * Allow symbol exports to be disabled completely so that C code may
57 * be reused in other execution contexts such as the UEFI stub or the
58 * decompressor.
59 */
60#define __EXPORT_SYMBOL(sym, license, ns)
61
62#elif defined(__GENKSYMS__)
63
64#define __EXPORT_SYMBOL(sym, license, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
65
66#elif defined(__ASSEMBLY__)
67
68#define __EXPORT_SYMBOL(sym, license, ns) \
69 ___EXPORT_SYMBOL(sym, license, ns)
70
71#else
72
73#define __EXPORT_SYMBOL(sym, license, ns) \
74 extern typeof(sym) sym; \
75 __ADDRESSABLE(sym) \
76 asm(__stringify(___EXPORT_SYMBOL(sym, license, ns)))
77
78#endif
79
80#ifdef DEFAULT_SYMBOL_NAMESPACE
81#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, __stringify(DEFAULT_SYMBOL_NAMESPACE))
82#else
83#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, "")
84#endif
85
86#define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "")
87#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "GPL")
88#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", __stringify(ns))
89#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", __stringify(ns))
90
91#endif /* _LINUX_EXPORT_H */