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1 | #ifndef _LINUX_EXPORT_H |
2 | #define _LINUX_EXPORT_H | |
3 | /* | |
4 | * Export symbols from the kernel to modules. Forked from module.h | |
5 | * to reduce the amount of pointless cruft we feed to gcc when only | |
6 | * exporting a simple symbol or two. | |
7 | * | |
8 | * If you feel the need to add #include <linux/foo.h> to this file | |
9 | * then you are doing something wrong and should go away silently. | |
10 | */ | |
11 | ||
12 | /* Some toolchains use a `_' prefix for all user symbols. */ | |
13 | #ifdef CONFIG_SYMBOL_PREFIX | |
14 | #define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX | |
15 | #else | |
16 | #define MODULE_SYMBOL_PREFIX "" | |
17 | #endif | |
18 | ||
19 | struct kernel_symbol | |
20 | { | |
21 | unsigned long value; | |
22 | const char *name; | |
23 | }; | |
24 | ||
25 | #ifdef MODULE | |
26 | extern struct module __this_module; | |
27 | #define THIS_MODULE (&__this_module) | |
28 | #else | |
29 | #define THIS_MODULE ((struct module *)0) | |
30 | #endif | |
31 | ||
32 | #ifdef CONFIG_MODULES | |
33 | ||
34 | #ifndef __GENKSYMS__ | |
35 | #ifdef CONFIG_MODVERSIONS | |
36 | /* Mark the CRC weak since genksyms apparently decides not to | |
37 | * generate a checksums for some symbols */ | |
38 | #define __CRC_SYMBOL(sym, sec) \ | |
39 | extern void *__crc_##sym __attribute__((weak)); \ | |
40 | static const unsigned long __kcrctab_##sym \ | |
41 | __used \ | |
42 | __attribute__((section("___kcrctab" sec "+" #sym), unused)) \ | |
43 | = (unsigned long) &__crc_##sym; | |
44 | #else | |
45 | #define __CRC_SYMBOL(sym, sec) | |
46 | #endif | |
47 | ||
48 | /* For every exported symbol, place a struct in the __ksymtab section */ | |
49 | #define __EXPORT_SYMBOL(sym, sec) \ | |
50 | extern typeof(sym) sym; \ | |
51 | __CRC_SYMBOL(sym, sec) \ | |
52 | static const char __kstrtab_##sym[] \ | |
53 | __attribute__((section("__ksymtab_strings"), aligned(1))) \ | |
54 | = MODULE_SYMBOL_PREFIX #sym; \ | |
55 | static const struct kernel_symbol __ksymtab_##sym \ | |
56 | __used \ | |
57 | __attribute__((section("___ksymtab" sec "+" #sym), unused)) \ | |
58 | = { (unsigned long)&sym, __kstrtab_##sym } | |
59 | ||
60 | #define EXPORT_SYMBOL(sym) \ | |
61 | __EXPORT_SYMBOL(sym, "") | |
62 | ||
63 | #define EXPORT_SYMBOL_GPL(sym) \ | |
64 | __EXPORT_SYMBOL(sym, "_gpl") | |
65 | ||
66 | #define EXPORT_SYMBOL_GPL_FUTURE(sym) \ | |
67 | __EXPORT_SYMBOL(sym, "_gpl_future") | |
68 | ||
69 | #ifdef CONFIG_UNUSED_SYMBOLS | |
70 | #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused") | |
71 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl") | |
72 | #else | |
73 | #define EXPORT_UNUSED_SYMBOL(sym) | |
74 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) | |
75 | #endif | |
76 | ||
77 | #endif /* __GENKSYMS__ */ | |
78 | ||
79 | #else /* !CONFIG_MODULES... */ | |
80 | ||
81 | #define EXPORT_SYMBOL(sym) | |
82 | #define EXPORT_SYMBOL_GPL(sym) | |
83 | #define EXPORT_SYMBOL_GPL_FUTURE(sym) | |
84 | #define EXPORT_UNUSED_SYMBOL(sym) | |
85 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) | |
86 | ||
87 | #endif /* CONFIG_MODULES */ | |
88 | ||
89 | #endif /* _LINUX_EXPORT_H */ |