/*-
 * Copyright (c) 2015-2018 The FreeBSD Foundation
 *
 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef __ARM64_IFUNC_H
#define __ARM64_IFUNC_H

struct __ifunc_arg_t
{
        unsigned long _size; /* Size of the struct, so it can grow. */
        unsigned long _hwcap;
        unsigned long _hwcap2;
        unsigned long _hwcap3;
        unsigned long _hwcap4;
};

typedef struct __ifunc_arg_t __ifunc_arg_t;

#define _IFUNC_ARG_HWCAP (1ULL << 62)

#define DEFINE_IFUNC(qual, ret_type, name, args)                        \
    static ret_type (*name##_resolver(void))args __used;                \
    qual ret_type name args __attribute__((ifunc(#name "_resolver")));  \
    static ret_type (*name##_resolver(void))args

#define DEFINE_UIFUNC(qual, ret_type, name, args)                       \
    static ret_type (*name##_resolver(uint64_t,                         \
        const struct __ifunc_arg_t *ifunc_arg,                          \
        uint64_t, uint64_t, uint64_t, uint64_t, uint64_t,               \
        uint64_t))args __used;                                          \
    qual ret_type name args __attribute__((ifunc(#name "_resolver")));  \
    static ret_type (*name##_resolver(                                  \
        uint64_t at_hwcap __unused,                                     \
        const struct __ifunc_arg_t *ifunc_arg __unused,                 \
        uint64_t _arg3 __unused,                                        \
        uint64_t _arg4 __unused,                                        \
        uint64_t _arg5 __unused,                                        \
        uint64_t _arg6 __unused,                                        \
        uint64_t _arg7 __unused,                                        \
        uint64_t _arg8 __unused))args

#endif