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126 lines
3.6 KiB
126 lines
3.6 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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#if defined(__KERNEL__) && !defined(__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), used)) \ |
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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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static const struct kernel_symbol __ksymtab_##sym \ |
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__used \ |
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__attribute__((section("___ksymtab" sec "+" #sym), used)) \ |
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= { (unsigned long)&sym, __kstrtab_##sym } |
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#if defined(__KSYM_DEPS__) |
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/* |
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* For fine grained build dependencies, we want to tell the build system |
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* about each possible exported symbol even if they're not actually exported. |
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* We use a string pattern that is unlikely to be valid code that the build |
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* system filters out from the preprocessor output (see ksym_dep_filter |
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* in scripts/Kbuild.include). |
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*/ |
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#define __EXPORT_SYMBOL(sym, sec) === __KSYM_##sym === |
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#elif defined(CONFIG_TRIM_UNUSED_KSYMS) |
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#include <generated/autoksyms.h> |
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#define __EXPORT_SYMBOL(sym, sec) \ |
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__cond_export_sym(sym, sec, __is_defined(__KSYM_##sym)) |
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#define __cond_export_sym(sym, sec, conf) \ |
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___cond_export_sym(sym, sec, conf) |
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#define ___cond_export_sym(sym, sec, enabled) \ |
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__cond_export_sym_##enabled(sym, sec) |
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#define __cond_export_sym_1(sym, sec) ___EXPORT_SYMBOL(sym, sec) |
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#define __cond_export_sym_0(sym, sec) /* nothing */ |
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#else |
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#define __EXPORT_SYMBOL ___EXPORT_SYMBOL |
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#endif |
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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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