/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1994-1996 Søren Schmidt
 * All rights reserved.
 *
 * 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.
 */

#include <sys/param.h>
#include <sys/signal.h>
#include <x86/specialreg.h>
#include <x86/trap.h>
#include <x86/x86_var.h>

#include <x86/linux/linux_x86.h>

#define LINUX_T_UNKNOWN  255
static int _bsd_to_linux_trapcode[] = {
        LINUX_T_UNKNOWN,        /* 0 */
        6,                      /* 1  T_PRIVINFLT */
        LINUX_T_UNKNOWN,        /* 2 */
        3,                      /* 3  T_BPTFLT */
        LINUX_T_UNKNOWN,        /* 4 */
        LINUX_T_UNKNOWN,        /* 5 */
        16,                     /* 6  T_ARITHTRAP */
        254,                    /* 7  T_ASTFLT */
        LINUX_T_UNKNOWN,        /* 8 */
        13,                     /* 9  T_PROTFLT */
        1,                      /* 10 T_TRCTRAP */
        LINUX_T_UNKNOWN,        /* 11 */
        14,                     /* 12 T_PAGEFLT */
        LINUX_T_UNKNOWN,        /* 13 */
        17,                     /* 14 T_ALIGNFLT */
        LINUX_T_UNKNOWN,        /* 15 */
        LINUX_T_UNKNOWN,        /* 16 */
        LINUX_T_UNKNOWN,        /* 17 */
        0,                      /* 18 T_DIVIDE */
        2,                      /* 19 T_NMI */
        4,                      /* 20 T_OFLOW */
        5,                      /* 21 T_BOUND */
        7,                      /* 22 T_DNA */
        8,                      /* 23 T_DOUBLEFLT */
        9,                      /* 24 T_FPOPFLT */
        10,                     /* 25 T_TSSFLT */
        11,                     /* 26 T_SEGNPFLT */
        12,                     /* 27 T_STKFLT */
        18,                     /* 28 T_MCHK */
        19,                     /* 29 T_XMMFLT */
        15                      /* 30 T_RESERVED */
};

/*
 * If FreeBSD & Linux have a difference of opinion about what a trap
 * means, deal with it here.
 */
int
linux_translate_traps(int signal, int trap_code)
{
        if (signal != SIGBUS)
                return (signal);
        switch (trap_code) {
        case T_PROTFLT:
        case T_TSSFLT:
        case T_DOUBLEFLT:
        case T_PAGEFLT:
                return (SIGSEGV);
        default:
                return (signal);
        }
}

int
bsd_to_linux_trapcode(int code)
{

        return (code < nitems(_bsd_to_linux_trapcode) ?
            _bsd_to_linux_trapcode[code] : LINUX_T_UNKNOWN);
}

u_int
linux_x86_elf_hwcap2(void)
{
        static u_int elf_hwcap2 = 0;
        static bool elf_hwcap2_valid = false;

        if (!elf_hwcap2_valid) {
                if ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0)
                        elf_hwcap2 |= LINUX_HWCAP2_FSGSBASE;
                elf_hwcap2_valid = true;
        }
        return (elf_hwcap2);
}