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_HAVE_ARCH_PREL32_RELOCATIONS
   8 #define KSYM_ALIGN 4
   9 #elif defined(CONFIG_64BIT)
  10 #define KSYM_ALIGN 8
  11 #else
  12 #define KSYM_ALIGN 4
  13 #endif
  14 #ifndef KCRC_ALIGN
  15 #define KCRC_ALIGN 4
  16 #endif
  17
  18 .macro __put, val, name
  19 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  20         .long   \val - ., \name - ., 0
  21 #elif defined(CONFIG_64BIT)
  22         .quad   \val, \name, 0
  23 #else
  24         .long   \val, \name, 0
  25 #endif
  26 .endm
  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         .section ___ksymtab\sec+\name,"a"
  35         .balign KSYM_ALIGN
  36 __ksymtab_\name:
  37         __put \val, __kstrtab_\name
  38         .previous
  39         .section __ksymtab_strings,"a"
  40 __kstrtab_\name:
  41         .asciz "\name"
  42         .previous
  43 #ifdef CONFIG_MODVERSIONS
  44         .section ___kcrctab\sec+\name,"a"
  45         .balign KCRC_ALIGN
  46 #if defined(CONFIG_MODULE_REL_CRCS)
  47         .long __crc_\name - .
  48 #else
  49         .long __crc_\name
  50 #endif
  51         .weak __crc_\name
  52         .previous
  53 #endif
  54 #endif
  55 .endm
  56
  57 #if defined(CONFIG_TRIM_UNUSED_KSYMS)
  58
  59 #include <linux/kconfig.h>
  60 #include <generated/autoksyms.h>
  61
  62 .macro __ksym_marker sym
  63         .section ".discard.ksym","a"
  64 __ksym_marker_\sym:
  65          .previous
  66 .endm
  67
  68 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  69         __ksym_marker sym;                                      \
  70         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  71 #define __cond_export_sym(sym, val, sec, conf)                  \
  72         ___cond_export_sym(sym, val, sec, conf)
  73 #define ___cond_export_sym(sym, val, sec, enabled)              \
  74         __cond_export_sym_##enabled(sym, val, sec)
  75 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  76 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  77
  78 #else
  79 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  80 #endif
  81
  82 #define EXPORT_SYMBOL(name)                                     \
  83         __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
  84 #define EXPORT_SYMBOL_GPL(name)                                 \
  85         __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  86 #define EXPORT_DATA_SYMBOL(name)                                \
  87         __EXPORT_SYMBOL(name, name,)
  88 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  89         __EXPORT_SYMBOL(name, name,_gpl)
  90
  91 #endif