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98 lines
2.7 KiB
98 lines
2.7 KiB
#ifndef _LINUX_EXPORT_H |
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#define _LINUX_EXPORT_H |
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/* |
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* Export symbols from the kernel to modules. Forked from module.h |
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* to reduce the amount of pointless cruft we feed to gcc when only |
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* exporting a simple symbol or two. |
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* |
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* Try not to add #includes here. It slows compilation and makes kernel |
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* hackers place grumpy comments in header files. |
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*/ |
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/* Some toolchains use a `_' prefix for all user symbols. */ |
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#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
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#define __VMLINUX_SYMBOL(x) _##x |
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#define __VMLINUX_SYMBOL_STR(x) "_" #x |
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#else |
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#define __VMLINUX_SYMBOL(x) x |
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#define __VMLINUX_SYMBOL_STR(x) #x |
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#endif |
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/* Indirect, so macros are expanded before pasting. */ |
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#define VMLINUX_SYMBOL(x) __VMLINUX_SYMBOL(x) |
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#define VMLINUX_SYMBOL_STR(x) __VMLINUX_SYMBOL_STR(x) |
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#ifndef __ASSEMBLY__ |
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struct kernel_symbol |
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{ |
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unsigned long value; |
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const char *name; |
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}; |
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#ifdef MODULE |
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extern struct module __this_module; |
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#define THIS_MODULE (&__this_module) |
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#else |
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#define THIS_MODULE ((struct module *)0) |
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#endif |
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#ifdef CONFIG_MODULES |
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#ifndef __GENKSYMS__ |
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#ifdef CONFIG_MODVERSIONS |
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/* Mark the CRC weak since genksyms apparently decides not to |
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* generate a checksums for some symbols */ |
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#define __CRC_SYMBOL(sym, sec) \ |
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extern __visible void *__crc_##sym __attribute__((weak)); \ |
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static const unsigned long __kcrctab_##sym \ |
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__used \ |
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__attribute__((section("___kcrctab" sec "+" #sym), unused)) \ |
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= (unsigned long) &__crc_##sym; |
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#else |
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#define __CRC_SYMBOL(sym, sec) |
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#endif |
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/* For every exported symbol, place a struct in the __ksymtab section */ |
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#define __EXPORT_SYMBOL(sym, sec) \ |
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extern typeof(sym) sym; \ |
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__CRC_SYMBOL(sym, sec) \ |
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static const char __kstrtab_##sym[] \ |
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__attribute__((section("__ksymtab_strings"), aligned(1))) \ |
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= VMLINUX_SYMBOL_STR(sym); \ |
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extern const struct kernel_symbol __ksymtab_##sym; \ |
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__visible const struct kernel_symbol __ksymtab_##sym \ |
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__used \ |
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__attribute__((section("___ksymtab" sec "+" #sym), unused)) \ |
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= { (unsigned long)&sym, __kstrtab_##sym } |
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#define EXPORT_SYMBOL(sym) \ |
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__EXPORT_SYMBOL(sym, "") |
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#define EXPORT_SYMBOL_GPL(sym) \ |
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__EXPORT_SYMBOL(sym, "_gpl") |
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#define EXPORT_SYMBOL_GPL_FUTURE(sym) \ |
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__EXPORT_SYMBOL(sym, "_gpl_future") |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused") |
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#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl") |
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#else |
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#define EXPORT_UNUSED_SYMBOL(sym) |
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#define EXPORT_UNUSED_SYMBOL_GPL(sym) |
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#endif |
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#endif /* __GENKSYMS__ */ |
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#else /* !CONFIG_MODULES... */ |
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#define EXPORT_SYMBOL(sym) |
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#define EXPORT_SYMBOL_GPL(sym) |
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#define EXPORT_SYMBOL_GPL_FUTURE(sym) |
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#define EXPORT_UNUSED_SYMBOL(sym) |
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#define EXPORT_UNUSED_SYMBOL_GPL(sym) |
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#endif /* CONFIG_MODULES */ |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _LINUX_EXPORT_H */
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