suyu/src/core/arm/dyncom/arm_dyncom_thumb.h

/* Copyright (C)
* 2011 - Michael.Kang blackfin.kang@gmail.com
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*
*/

/**
* @file arm_dyncom_thumb.h
* @brief The thumb dyncom
* @author Michael.Kang blackfin.kang@gmail.com
* @version 78.77
* @date 2011-11-07
*/

#pragma once

#include "common/common_types.h"

enum class ThumbDecodeStatus {
    UNDEFINED,    // Undefined Thumb instruction
    DECODED,      // Instruction decoded to ARM equivalent
    BRANCH,       // Thumb branch (already processed)
    UNINITIALIZED,
};

// Translates a Thumb mode instruction into its ARM equivalent.
ThumbDecodeStatus TranslateThumbInstruction(u32 addr, u32 instr, u32* ainstr, u32* inst_size);

static inline u32 GetThumbInstruction(u32 instr, u32 address) {
    // Normally you would need to handle instruction endianness,
    // however, it is fixed to little-endian on the MPCore, so
    // there's no need to check for this beforehand.
    if ((address & 0x3) != 0)
        return instr >> 16;

    return instr & 0xFFFF;
}