Quelle export.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _LINUX_EXPORT_H
#define _LINUX_EXPORT_H

#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/stringify.h>

/*
* This comment block is used by fixdep. Please do not remove.
*
* When CONFIG_MODVERSIONS is changed from n to y, all source files having
* EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
* side effect of the *.o build rule.
*/

#ifdef CONFIG_64BIT
#define __EXPORT_SYMBOL_REF(sym)   \
.balign 8    ASM_NL \
.quad sym
#else
#define __EXPORT_SYMBOL_REF(sym)   \
.balign 4    ASM_NL \
.long sym
#endif

/*
* LLVM integrated assembler cam merge adjacent string literals (like
* C and GNU-as) passed to '.ascii', but not to '.asciz' and chokes on:
*
*   .asciz "MODULE_" "kvm" ;
*/
#define ___EXPORT_SYMBOL(sym, license, ns...)  \
.section ".export_symbol","a"  ASM_NL \
__export_symbol_##sym:   ASM_NL \
  .asciz license   ASM_NL \
  .ascii ns "\0"   ASM_NL \
  __EXPORT_SYMBOL_REF(sym) ASM_NL \
.previous

#if defined(__DISABLE_EXPORTS)

/*
* Allow symbol exports to be disabled completely so that C code may
* be reused in other execution contexts such as the UEFI stub or the
* decompressor.
*/
#define __EXPORT_SYMBOL(sym, license, ns)

#elif defined(__GENKSYMS__)

#define __EXPORT_SYMBOL(sym, license, ns) __GENKSYMS_EXPORT_SYMBOL(sym)

#elif defined(__ASSEMBLY__)

#define __EXPORT_SYMBOL(sym, license, ns) \
___EXPORT_SYMBOL(sym, license, ns)

#else

#ifdef CONFIG_GENDWARFKSYMS
/*
* With CONFIG_GENDWARFKSYMS, ensure the compiler emits debugging
* information for all exported symbols, including those defined in
* different TUs, by adding a __gendwarfksyms_ptr_<symbol> pointer
* that's discarded during the final link.
*/
#define __GENDWARFKSYMS_EXPORT(sym)    \
static typeof(sym) *__gendwarfksyms_ptr_##sym __used \
  __section(".discard.gendwarfksyms") = &sym;
#else
#define __GENDWARFKSYMS_EXPORT(sym)
#endif

#define __EXPORT_SYMBOL(sym, license, ns)   \
extern typeof(sym) sym;     \
__ADDRESSABLE(sym)     \
__GENDWARFKSYMS_EXPORT(sym)    \
asm(__stringify(___EXPORT_SYMBOL(sym, license, ns)))

#endif

#ifdef DEFAULT_SYMBOL_NAMESPACE
#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, DEFAULT_SYMBOL_NAMESPACE)
#else
#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, "")
#endif

#define EXPORT_SYMBOL(sym)  _EXPORT_SYMBOL(sym, "")
#define EXPORT_SYMBOL_GPL(sym)  _EXPORT_SYMBOL(sym, "GPL")
#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", ns)
#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", ns)

#define EXPORT_SYMBOL_FOR_MODULES(sym, mods) __EXPORT_SYMBOL(sym, "GPL", "module:" mods)

#endif /* _LINUX_EXPORT_H */

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