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 #ifndef KSYM_ALIGN
   9 #define KSYM_ALIGN 8
  10 #endif
  11 #else
  12 #ifndef KSYM_ALIGN
  13 #define KSYM_ALIGN 4
  14 #endif
  15 #endif
  16 #ifndef KCRC_ALIGN
  17 #define KCRC_ALIGN 4
  18 #endif
  19
  20 .macro __put, val, name
  21 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  22         .long   \val - ., \name - .
  23 #elif defined(CONFIG_64BIT)
  24         .quad   \val, \name
  25 #else
  26         .long   \val, \name
  27 #endif
  28 .endm
  29
  30 /*
  31  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
  32  * since we immediately emit into those sections anyway.
  33  */
  34 .macro ___EXPORT_SYMBOL name,val,sec
  35 #ifdef CONFIG_MODULES
  36         .globl __ksymtab_\name
  37         .section ___ksymtab\sec+\name,"a"
  38         .balign KSYM_ALIGN
  39 __ksymtab_\name:
  40         __put \val, __kstrtab_\name
  41         .previous
  42         .section __ksymtab_strings,"a"
  43 __kstrtab_\name:
  44         .asciz "\name"
  45         .previous
  46 #ifdef CONFIG_MODVERSIONS
  47         .section ___kcrctab\sec+\name,"a"
  48         .balign KCRC_ALIGN
  49 __kcrctab_\name:
  50 #if defined(CONFIG_MODULE_REL_CRCS)
  51         .long __crc_\name - .
  52 #else
  53         .long __crc_\name
  54 #endif
  55         .weak __crc_\name
  56         .previous
  57 #endif
  58 #endif
  59 .endm
  60 #undef __put
  61
  62 #if defined(CONFIG_TRIM_UNUSED_KSYMS)
  63
  64 #include <linux/kconfig.h>
  65 #include <generated/autoksyms.h>
  66
  67 .macro __ksym_marker sym
  68         .section ".discard.ksym","a"
  69 __ksym_marker_\sym:
  70          .previous
  71 .endm
  72
  73 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  74         __ksym_marker sym;                                      \
  75         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  76 #define __cond_export_sym(sym, val, sec, conf)                  \
  77         ___cond_export_sym(sym, val, sec, conf)
  78 #define ___cond_export_sym(sym, val, sec, enabled)              \
  79         __cond_export_sym_##enabled(sym, val, sec)
  80 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  81 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  82
  83 #else
  84 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  85 #endif
  86
  87 #define EXPORT_SYMBOL(name)                                     \
  88         __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
  89 #define EXPORT_SYMBOL_GPL(name)                                 \
  90         __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  91 #define EXPORT_DATA_SYMBOL(name)                                \
  92         __EXPORT_SYMBOL(name, name,)
  93 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  94         __EXPORT_SYMBOL(name, name,_gpl)
  95
  96 #endif