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TOMOYO Linux Cross Reference
Linux/include/linux/export.h

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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  * Try not to add #includes here.  It slows compilation and makes kernel
  9  * hackers place grumpy comments in header files.
 10  */
 11 
 12 /* Some toolchains use a `_' prefix for all user symbols. */
 13 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
 14 #define __VMLINUX_SYMBOL(x) _##x
 15 #define __VMLINUX_SYMBOL_STR(x) "_" #x
 16 #else
 17 #define __VMLINUX_SYMBOL(x) x
 18 #define __VMLINUX_SYMBOL_STR(x) #x
 19 #endif
 20 
 21 /* Indirect, so macros are expanded before pasting. */
 22 #define VMLINUX_SYMBOL(x) __VMLINUX_SYMBOL(x)
 23 #define VMLINUX_SYMBOL_STR(x) __VMLINUX_SYMBOL_STR(x)
 24 
 25 #ifndef __ASSEMBLY__
 26 struct kernel_symbol
 27 {
 28         unsigned long value;
 29         const char *name;
 30 };
 31 
 32 #ifdef MODULE
 33 extern struct module __this_module;
 34 #define THIS_MODULE (&__this_module)
 35 #else
 36 #define THIS_MODULE ((struct module *)0)
 37 #endif
 38 
 39 #ifdef CONFIG_MODULES
 40 
 41 #ifndef __GENKSYMS__
 42 #ifdef CONFIG_MODVERSIONS
 43 /* Mark the CRC weak since genksyms apparently decides not to
 44  * generate a checksums for some symbols */
 45 #define __CRC_SYMBOL(sym, sec)                                  \
 46         extern void *__crc_##sym __attribute__((weak));         \
 47         static const unsigned long __kcrctab_##sym              \
 48         __used                                                  \
 49         __attribute__((section("___kcrctab" sec "+" #sym), unused))     \
 50         = (unsigned long) &__crc_##sym;
 51 #else
 52 #define __CRC_SYMBOL(sym, sec)
 53 #endif
 54 
 55 /* For every exported symbol, place a struct in the __ksymtab section */
 56 #define __EXPORT_SYMBOL(sym, sec)                               \
 57         extern typeof(sym) sym;                                 \
 58         __CRC_SYMBOL(sym, sec)                                  \
 59         static const char __kstrtab_##sym[]                     \
 60         __attribute__((section("__ksymtab_strings"), aligned(1))) \
 61         = VMLINUX_SYMBOL_STR(sym);                              \
 62         static const struct kernel_symbol __ksymtab_##sym       \
 63         __used                                                  \
 64         __attribute__((section("___ksymtab" sec "+" #sym), unused))     \
 65         = { (unsigned long)&sym, __kstrtab_##sym }
 66 
 67 #define EXPORT_SYMBOL(sym)                                      \
 68         __EXPORT_SYMBOL(sym, "")
 69 
 70 #define EXPORT_SYMBOL_GPL(sym)                                  \
 71         __EXPORT_SYMBOL(sym, "_gpl")
 72 
 73 #define EXPORT_SYMBOL_GPL_FUTURE(sym)                           \
 74         __EXPORT_SYMBOL(sym, "_gpl_future")
 75 
 76 #ifdef CONFIG_UNUSED_SYMBOLS
 77 #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
 78 #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
 79 #else
 80 #define EXPORT_UNUSED_SYMBOL(sym)
 81 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
 82 #endif
 83 
 84 #endif  /* __GENKSYMS__ */
 85 
 86 #else /* !CONFIG_MODULES... */
 87 
 88 #define EXPORT_SYMBOL(sym)
 89 #define EXPORT_SYMBOL_GPL(sym)
 90 #define EXPORT_SYMBOL_GPL_FUTURE(sym)
 91 #define EXPORT_UNUSED_SYMBOL(sym)
 92 #define EXPORT_UNUSED_SYMBOL_GPL(sym)
 93 
 94 #endif /* CONFIG_MODULES */
 95 #endif /* !__ASSEMBLY__ */
 96 
 97 #endif /* _LINUX_EXPORT_H */
 98 

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