include/asm-generic/export.h

   1 #ifndef __ASM_GENERIC_EXPORT_H
   2 #define __ASM_GENERIC_EXPORT_H
   3
   4 #ifndef KSYM_FUNC
   5 #define KSYM_FUNC(x) x
   6 #endif
   7 #ifdef CONFIG_64BIT
   8 #define __put .quad
   9 #ifndef KSYM_ALIGN
  10 #define KSYM_ALIGN 8
  11 #endif
  12 #else
  13 #define __put .long
  14 #ifndef KSYM_ALIGN
  15 #define KSYM_ALIGN 4
  16 #endif
  17 #endif
  18 #ifndef KCRC_ALIGN
  19 #define KCRC_ALIGN 4
  20 #endif
  21
  22 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
  23 #define KSYM(name) _##name
  24 #else
  25 #define KSYM(name) name
  26 #endif
  27
  28 /*
  29  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
  30  * since we immediately emit into those sections anyway.
  31  */
  32 .macro ___EXPORT_SYMBOL name,val,sec
  33 #ifdef CONFIG_MODULES
  34         .globl KSYM(__ksymtab_\name)
  35         .section ___ksymtab\sec+\name,"a"
  36         .balign KSYM_ALIGN
  37 KSYM(__ksymtab_\name):
  38         __put \val, KSYM(__kstrtab_\name)
  39         .previous
  40         .section __ksymtab_strings,"a"
  41 KSYM(__kstrtab_\name):
  42 #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
  43         .asciz "_\name"
  44 #else
  45         .asciz "\name"
  46 #endif
  47         .previous
  48 #ifdef CONFIG_MODVERSIONS
  49         .section ___kcrctab\sec+\name,"a"
  50         .balign KCRC_ALIGN
  51 KSYM(__kcrctab_\name):
  52 #if defined(CONFIG_MODULE_REL_CRCS)
  53         .long KSYM(__crc_\name) - .
  54 #else
  55         .long KSYM(__crc_\name)
  56 #endif
  57         .weak KSYM(__crc_\name)
  58         .previous
  59 #endif
  60 #endif
  61 .endm
  62 #undef __put
  63
  64 #if defined(__KSYM_DEPS__)
  65
  66 #define __EXPORT_SYMBOL(sym, val, sec)  === __KSYM_##sym ===
  67
  68 #elif defined(CONFIG_TRIM_UNUSED_KSYMS)
  69
  70 #include <linux/kconfig.h>
  71 #include <generated/autoksyms.h>
  72
  73 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  74         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  75 #define __cond_export_sym(sym, val, sec, conf)                  \
  76         ___cond_export_sym(sym, val, sec, conf)
  77 #define ___cond_export_sym(sym, val, sec, enabled)              \
  78         __cond_export_sym_##enabled(sym, val, sec)
  79 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  80 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  81
  82 #else
  83 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  84 #endif
  85
  86 #define EXPORT_SYMBOL(name)                                     \
  87         __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)),)
  88 #define EXPORT_SYMBOL_GPL(name)                                 \
  89         __EXPORT_SYMBOL(name, KSYM_FUNC(KSYM(name)), _gpl)
  90 #define EXPORT_DATA_SYMBOL(name)                                \
  91         __EXPORT_SYMBOL(name, KSYM(name),)
  92 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  93         __EXPORT_SYMBOL(name, KSYM(name),_gpl)
  94
  95 #endif