include/asm-generic/export.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ASM_GENERIC_EXPORT_H
   3 #define __ASM_GENERIC_EXPORT_H
   4
   5 /*
   6  * This comment block is used by fixdep. Please do not remove.
   7  *
   8  * When CONFIG_MODVERSIONS is changed from n to y, all source files having
   9  * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
  10  * side effect of the *.o build rule.
  11  */
  12
  13 #ifndef KSYM_FUNC
  14 #define KSYM_FUNC(x) x
  15 #endif
  16 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  17 #define KSYM_ALIGN 4
  18 #elif defined(CONFIG_64BIT)
  19 #define KSYM_ALIGN 8
  20 #else
  21 #define KSYM_ALIGN 4
  22 #endif
  23
  24 .macro __put, val, name
  25 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  26         .long   \val - ., \name - ., 0
  27 #elif defined(CONFIG_64BIT)
  28         .quad   \val, \name, 0
  29 #else
  30         .long   \val, \name, 0
  31 #endif
  32 .endm
  33
  34 /*
  35  * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
  36  * section flag requires it. Use '%progbits' instead of '@progbits' since the
  37  * former apparently works on all arches according to the binutils source.
  38  */
  39
  40 .macro ___EXPORT_SYMBOL name,val,sec
  41 #if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
  42         .section ___ksymtab\sec+\name,"a"
  43         .balign KSYM_ALIGN
  44 __ksymtab_\name:
  45         __put \val, __kstrtab_\name
  46         .previous
  47         .section __ksymtab_strings,"aMS",%progbits,1
  48 __kstrtab_\name:
  49         .asciz "\name"
  50         .previous
  51 #endif
  52 .endm
  53
  54 #if defined(CONFIG_TRIM_UNUSED_KSYMS)
  55
  56 #include <linux/kconfig.h>
  57 #include <generated/autoksyms.h>
  58
  59 .macro __ksym_marker sym
  60         .section ".discard.ksym","a"
  61 __ksym_marker_\sym:
  62          .previous
  63 .endm
  64
  65 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  66         __ksym_marker sym;                                      \
  67         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  68 #define __cond_export_sym(sym, val, sec, conf)                  \
  69         ___cond_export_sym(sym, val, sec, conf)
  70 #define ___cond_export_sym(sym, val, sec, enabled)              \
  71         __cond_export_sym_##enabled(sym, val, sec)
  72 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  73 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  74
  75 #else
  76 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  77 #endif
  78
  79 #define EXPORT_SYMBOL(name)                                     \
  80         __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
  81 #define EXPORT_SYMBOL_GPL(name)                                 \
  82         __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  83 #define EXPORT_DATA_SYMBOL(name)                                \
  84         __EXPORT_SYMBOL(name, name,)
  85 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  86         __EXPORT_SYMBOL(name, name,_gpl)
  87
  88 #endif