Quelle export-internal.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Please do not include this explicitly.
* This is used by C files generated by modpost.
*/

#ifndef __LINUX_EXPORT_INTERNAL_H__
#define __LINUX_EXPORT_INTERNAL_H__

#include <linux/compiler.h>
#include <linux/types.h>

#if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)
/*
* relative reference: this reduces the size by half on 64-bit architectures,
* and eliminates the need for absolute relocations that require runtime
* processing on relocatable kernels.
*/
#define __KSYM_ALIGN  ".balign 4"
#define __KSYM_REF(sym)  ".long " #sym "- ."
#elif defined(CONFIG_64BIT)
#define __KSYM_ALIGN  ".balign 8"
#define __KSYM_REF(sym)  ".quad " #sym
#else
#define __KSYM_ALIGN  ".balign 4"
#define __KSYM_REF(sym)  ".long " #sym
#endif

/*
* For every exported symbol, do the following:
*
* - Put the name of the symbol and namespace (empty string "" for none) in
*   __ksymtab_strings.
* - Place a struct kernel_symbol entry in the __ksymtab section.
*
* Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
* section flag requires it. Use '%progbits' instead of '@progbits' since the
* former apparently works on all arches according to the binutils source.
*/
#define __KSYMTAB(name, sym, sec, ns)      \
asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1" "\n" \
     "__kstrtab_" #name ":"     "\n" \
     " .asciz \"" #name "\""     "\n" \
     "__kstrtabns_" #name ":"     "\n" \
     " .asciz \"" ns "\""     "\n" \
     " .previous"      "\n" \
     " .section \"___ksymtab" sec "+" #name "\", \"a\"" "\n" \
  __KSYM_ALIGN      "\n" \
     "__ksymtab_" #name ":"     "\n" \
  __KSYM_REF(sym)      "\n" \
  __KSYM_REF(__kstrtab_ ##name)    "\n" \
  __KSYM_REF(__kstrtabns_ ##name)    "\n" \
     " .previous"      "\n" \
)

#if defined(CONFIG_PARISC) && defined(CONFIG_64BIT)
#define KSYM_FUNC(name)  P%name
#else
#define KSYM_FUNC(name)  name
#endif

#define KSYMTAB_FUNC(name, sec, ns) __KSYMTAB(name, KSYM_FUNC(name), sec, ns)
#define KSYMTAB_DATA(name, sec, ns) __KSYMTAB(name, name, sec, ns)

#define SYMBOL_CRC(sym, crc, sec)   \
asm(".section \"___kcrctab" sec "+" #sym "\",\"a\"" "\n" \
     ".balign 4"      "\n" \
     "__crc_" #sym ":"     "\n" \
     ".long " #crc     "\n" \
     ".previous"      "\n")

#endif /* __LINUX_EXPORT_INTERNAL_H__ */

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