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 /*
  23  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
  24  * since we immediately emit into those sections anyway.
  25  */
  26 .macro ___EXPORT_SYMBOL name,val,sec
  27 #ifdef CONFIG_MODULES
  28         .globl __ksymtab_\name
  29         .section ___ksymtab\sec+\name,"a"
  30         .balign KSYM_ALIGN
  31 __ksymtab_\name:
  32         __put \val, __kstrtab_\name
  33         .previous
  34         .section __ksymtab_strings,"a"
  35 __kstrtab_\name:
  36         .asciz "\name"
  37         .previous
  38 #ifdef CONFIG_MODVERSIONS
  39         .section ___kcrctab\sec+\name,"a"
  40         .balign KCRC_ALIGN
  41 __kcrctab_\name:
  42 #if defined(CONFIG_MODULE_REL_CRCS)
  43         .long __crc_\name - .
  44 #else
  45         .long __crc_\name
  46 #endif
  47         .weak __crc_\name
  48         .previous
  49 #endif
  50 #endif
  51 .endm
  52 #undef __put
  53
  54 #if defined(__KSYM_DEPS__)
  55
  56 #define __EXPORT_SYMBOL(sym, val, sec)  === __KSYM_##sym ===
  57
  58 #elif defined(CONFIG_TRIM_UNUSED_KSYMS)
  59
  60 #include <linux/kconfig.h>
  61 #include <generated/autoksyms.h>
  62
  63 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  64         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  65 #define __cond_export_sym(sym, val, sec, conf)                  \
  66         ___cond_export_sym(sym, val, sec, conf)
  67 #define ___cond_export_sym(sym, val, sec, enabled)              \
  68         __cond_export_sym_##enabled(sym, val, sec)
  69 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  70 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  71
  72 #else
  73 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  74 #endif
  75
  76 #define EXPORT_SYMBOL(name)                                     \
  77         __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
  78 #define EXPORT_SYMBOL_GPL(name)                                 \
  79         __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  80 #define EXPORT_DATA_SYMBOL(name)                                \
  81         __EXPORT_SYMBOL(name, name,)
  82 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  83         __EXPORT_SYMBOL(name, name,_gpl)
  84
  85 #endif