LXR linux/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
  97