/* 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>
#include <linux/linkage.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

#define KSYM_RAP_HASH(name) __RAP_HASH(__rap_hash_call_,name)
#ifdef RAP_PLUGIN_HASH
# define KSYM_RAP_HASH_WEAK(name) extern long __weak __rap_hash_call_##name
#else
# define KSYM_RAP_HASH_WEAK(name)
#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, rap_hash)                \
    static const char __kstrtab_##name[]                \
    __section("__ksymtab_strings", nMS1) __used __aligned(1)    \
    = #name;                            \
    static const char __kstrtabns_##name[]                \
    __section("__ksymtab_strings", nMS1) __used __aligned(1)    \
    = ns;                                \
    KSYM_RAP_HASH_WEAK(name);                    \
    asm("    .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"    \
        rap_hash                         "\n"    \
        "    .previous"                        "\n"    \
    )

#ifdef CONFIG_IA64
#define KSYM_FUNC(name)        @fptr(name)
#elif 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, KSYM_RAP_HASH(name))
#define KSYMTAB_DATA(name, sec, ns)    __KSYMTAB(name, name, sec, ns, __RAP_HASH(,0))

#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__ */