LXR linux/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#ifndef KSYM_FUNC
   6#define KSYM_FUNC(x) x
   7#endif
   8#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
   9#define KSYM_ALIGN 4
  10#elif defined(CONFIG_64BIT)
  11#define KSYM_ALIGN 8
  12#else
  13#define KSYM_ALIGN 4
  14#endif
  15#ifndef KCRC_ALIGN
  16#define KCRC_ALIGN 4
  17#endif
  18
  19.macro __put, val, name
  20#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  21        .long   \val - ., \name - ., 0
  22#elif defined(CONFIG_64BIT)
  23        .quad   \val, \name, 0
  24#else
  25        .long   \val, \name, 0
  26#endif
  27.endm
  28
  29/*
  30 * note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
  31 * section flag requires it. Use '%progbits' instead of '@progbits' since the
  32 * former apparently works on all arches according to the binutils source.
  33 */
  34
  35.macro ___EXPORT_SYMBOL name,val,sec
  36#ifdef CONFIG_MODULES
  37        .section ___ksymtab\sec+\name,"a"
  38        .balign KSYM_ALIGN
  39__ksymtab_\name:
  40        __put \val, __kstrtab_\name
  41        .previous
  42        .section __ksymtab_strings,"aMS",%progbits,1
  43__kstrtab_\name:
  44        .asciz "\name"
  45        .previous
  46#ifdef CONFIG_MODVERSIONS
  47        .section ___kcrctab\sec+\name,"a"
  48        .balign KCRC_ALIGN
  49#if defined(CONFIG_MODULE_REL_CRCS)
  50        .long __crc_\name - .
  51#else
  52        .long __crc_\name
  53#endif
  54        .weak __crc_\name
  55        .previous
  56#endif
  57#endif
  58.endm
  59
  60#if defined(CONFIG_TRIM_UNUSED_KSYMS)
  61
  62#include <linux/kconfig.h>
  63#include <generated/autoksyms.h>
  64
  65.macro __ksym_marker sym
  66        .section ".discard.ksym","a"
  67__ksym_marker_\sym:
  68         .previous
  69.endm
  70
  71#define __EXPORT_SYMBOL(sym, val, sec)                          \
  72        __ksym_marker sym;                                      \
  73        __cond_export_sym(sym, val, sec, __is_defined(__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(name),)
  87#define EXPORT_SYMBOL_GPL(name)                                 \
  88        __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  89#define EXPORT_DATA_SYMBOL(name)                                \
  90        __EXPORT_SYMBOL(name, name,)
  91#define EXPORT_DATA_SYMBOL_GPL(name)                            \
  92        __EXPORT_SYMBOL(name, name,_gpl)
  93
  94#endif
  95