projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f5016932 PG |
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 | * | |
| b92021b0 RR |
8 | * Try not to add #includes here. It slows compilation and makes kernel |
| 9 | * hackers place grumpy comments in header files. | |
| f5016932 PG |
10 | */ |
| 11 | ||
| 12 | /* Some toolchains use a `_' prefix for all user symbols. */ | |
| b92021b0 RR |
13 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
| 14 | #define __VMLINUX_SYMBOL(x) _##x | |
| 15 | #define __VMLINUX_SYMBOL_STR(x) "_" #x | |
| f5016932 | 16 | #else |
| b92021b0 RR |
17 | #define __VMLINUX_SYMBOL(x) x |
| 18 | #define __VMLINUX_SYMBOL_STR(x) #x | |
| f5016932 PG |
19 | #endif |
| 20 | ||
| b92021b0 RR |
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__ | |
| f5016932 PG |
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) \ | |
| e0f244c6 | 46 | extern __visible void *__crc_##sym __attribute__((weak)); \ |
| f5016932 PG |
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))) \ | |
| b92021b0 | 61 | = VMLINUX_SYMBOL_STR(sym); \ |
| 7b4ec8dd | 62 | extern const struct kernel_symbol __ksymtab_##sym; \ |
| e0f244c6 | 63 | __visible const struct kernel_symbol __ksymtab_##sym \ |
| f5016932 PG |
64 | __used \ |
| 65 | __attribute__((section("___ksymtab" sec "+" #sym), unused)) \ | |
| 66 | = { (unsigned long)&sym, __kstrtab_##sym } | |
| 67 | ||
| 68 | #define EXPORT_SYMBOL(sym) \ | |
| 69 | __EXPORT_SYMBOL(sym, "") | |
| 70 | ||
| 71 | #define EXPORT_SYMBOL_GPL(sym) \ | |
| 72 | __EXPORT_SYMBOL(sym, "_gpl") | |
| 73 | ||
| 74 | #define EXPORT_SYMBOL_GPL_FUTURE(sym) \ | |
| 75 | __EXPORT_SYMBOL(sym, "_gpl_future") | |
| 76 | ||
| 77 | #ifdef CONFIG_UNUSED_SYMBOLS | |
| 78 | #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused") | |
| 79 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl") | |
| 80 | #else | |
| 81 | #define EXPORT_UNUSED_SYMBOL(sym) | |
| 82 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) | |
| 83 | #endif | |
| 84 | ||
| 85 | #endif /* __GENKSYMS__ */ | |
| 86 | ||
| 87 | #else /* !CONFIG_MODULES... */ | |
| 88 | ||
| 89 | #define EXPORT_SYMBOL(sym) | |
| 90 | #define EXPORT_SYMBOL_GPL(sym) | |
| 91 | #define EXPORT_SYMBOL_GPL_FUTURE(sym) | |
| 92 | #define EXPORT_UNUSED_SYMBOL(sym) | |
| 93 | #define EXPORT_UNUSED_SYMBOL_GPL(sym) | |
| 94 | ||
| 95 | #endif /* CONFIG_MODULES */ | |
| b92021b0 | 96 | #endif /* !__ASSEMBLY__ */ |
| f5016932 PG |
97 | |
| 98 | #endif /* _LINUX_EXPORT_H */ |