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