149 lines
2.9 KiB
C++
149 lines
2.9 KiB
C++
// Meteor - A Nintendo Gameboy Advance emulator
|
|
// Copyright (C) 2009-2011 Philippe Daouadi
|
|
//
|
|
// 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
|
|
#ifndef __CPU_H__
|
|
#define __CPU_H__
|
|
|
|
#include <stdint.h>
|
|
#include <istream>
|
|
#include <ostream>
|
|
|
|
namespace AMeteor
|
|
{
|
|
class Cpu
|
|
{
|
|
public :
|
|
union Psr
|
|
{
|
|
uint32_t dw;
|
|
struct
|
|
{
|
|
unsigned int mode : 5;
|
|
unsigned int thumb : 1;
|
|
unsigned int fiq_d : 1;
|
|
unsigned int irq_d : 1;
|
|
unsigned int reserved : 19;
|
|
unsigned int s_overflow : 1;
|
|
unsigned int f_overflow : 1;
|
|
unsigned int f_carry : 1;
|
|
unsigned int f_zero : 1;
|
|
unsigned int f_sign : 1;
|
|
} b;
|
|
};
|
|
struct IPsr
|
|
{
|
|
uint8_t mode;
|
|
bool thumb;
|
|
bool fiq_d;
|
|
bool irq_d;
|
|
bool s_overflow;
|
|
bool f_overflow;
|
|
bool f_carry;
|
|
bool f_zero;
|
|
bool f_sign;
|
|
};
|
|
enum Modes
|
|
{
|
|
M_USR = 0x10,
|
|
M_FIQ = 0x11,
|
|
M_IRQ = 0x12,
|
|
M_SVC = 0x13,
|
|
M_ABT = 0x17,
|
|
M_UND = 0x1B,
|
|
M_SYS = 0x1F
|
|
};
|
|
|
|
Cpu ();
|
|
virtual ~Cpu () {}
|
|
|
|
virtual void Reset ();
|
|
virtual void SoftReset ();
|
|
|
|
void UpdateICpsr ();
|
|
void UpdateCpsr ();
|
|
void SwitchToMode (uint8_t newmode);
|
|
void SwitchModeBack ();
|
|
|
|
virtual void SendInterrupt (uint16_t interrupt) = 0;
|
|
virtual void CheckInterrupt () = 0;
|
|
void Interrupt ();
|
|
void SoftwareInterrupt (uint32_t comment);
|
|
void SoftwareInterrupt ();
|
|
|
|
uint32_t& Reg(uint8_t r)
|
|
{
|
|
return m_st.r[r];
|
|
}
|
|
|
|
Psr& Cpsr()
|
|
{
|
|
return m_st.cpsr;
|
|
}
|
|
IPsr& ICpsr()
|
|
{
|
|
return m_st.icpsr;
|
|
}
|
|
Psr& Spsr()
|
|
{
|
|
return m_st.spsr;
|
|
}
|
|
|
|
bool SaveState (std::ostream& stream);
|
|
bool LoadState (std::istream& stream);
|
|
|
|
protected :
|
|
struct CPUState
|
|
{
|
|
// Current registers
|
|
uint32_t r[16];
|
|
Psr cpsr, spsr;
|
|
IPsr icpsr;
|
|
|
|
// System/User
|
|
uint32_t usr_r[7]; // from 8 to 14
|
|
|
|
// FIQ
|
|
uint32_t fiq_r[7]; // from 8 to 14
|
|
Psr fiq_spsr;
|
|
|
|
// Supervisor
|
|
uint32_t svc_r[2]; // 13 and 14
|
|
Psr svc_spsr;
|
|
|
|
// Abort
|
|
uint32_t abt_r[2]; // 13 and 14
|
|
Psr abt_spsr;
|
|
|
|
// IRQ
|
|
uint32_t irq_r[2]; // 13 and 14
|
|
Psr irq_spsr;
|
|
|
|
// Undefined
|
|
uint32_t und_r[2]; // 13 and 14
|
|
Psr und_spsr;
|
|
};
|
|
|
|
CPUState m_st;
|
|
|
|
virtual void SetInterrupt (bool interrupt) = 0;
|
|
|
|
private :
|
|
void SaveMode (uint8_t mode);
|
|
};
|
|
}
|
|
|
|
#endif
|