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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#ifndef REGISTERS_H
#define REGISTERS_H
#include <QObject>
#include <cstdint>
namespace machine {
class Registers : public QObject {
Q_OBJECT
public:
Registers();
Registers(const Registers&);
std::uint32_t read_pc() const; // Return current value of program counter
std::uint32_t pc_inc(); // Increment program counter by four bytes
std::uint32_t pc_jmp(std::int32_t offset); // Relative jump from current location in program counter
void pc_abs_jmp(std::uint32_t address); // Absolute jump in program counter (write to pc)
void pc_abs_jmp_28(std::uint32_t address); // Absolute jump in current 256MB section (basically J implementation)
std::uint32_t read_gp(std::uint8_t i) const; // Read general-purpose register
void write_gp(std::uint8_t i, std::uint32_t value); // Write general-purpose register
std::uint32_t read_hi_lo(bool hi) const; // true - read HI / false - read LO
void write_hi_lo(bool hi, std::uint32_t value);
bool operator ==(const Registers &c) const;
bool operator !=(const Registers &c) const;
void reset(); // Reset all values to zero (except pc)
signals:
void pc_update(std::uint32_t val);
void gp_update(std::uint8_t i, std::uint32_t val);
void hi_lo_update(bool hi, std::uint32_t val);
void gp_read(std::uint8_t i, std::uint32_t val) const;
void hi_lo_read(bool hi, std::uint32_t val) const;
private:
std::uint32_t gp[31]; // general-purpose registers ($0 is intentionally skipped)
std::uint32_t hi, lo;
std::uint32_t pc; // program counter
};
}
Q_DECLARE_METATYPE(machine::Registers)
#endif // REGISTERS_H
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