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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 INSTRUCTION_H
#define INSTRUCTION_H
#include <QObject>
#include <QString>
#include "machinedefs.h"
namespace machine {
enum InstructionFlags {
IMF_NONE = 0,
IMF_SUPPORTED = 1L<<0, /**< Instruction is supported */
IMF_MEMWRITE = 1L<<1, /**< Write to the memory when memory stage is reached */
IMF_MEMREAD = 1L<<2, /**< Read from the memory when memory stage is reached */
IMF_ALUSRC = 1L<<3, /**< The second ALU source is immediate operand */
IMF_REGD = 1L<<4, /**< RD field specifies register to be updated, if not
set and REGWRITE = 1, then destination reg in RT */
IMF_REGWRITE = 1L<<5, /**< Instruction result (ALU or memory) is written to
register file */
IMF_ZERO_EXTEND= 1L<<6, /**< Immediate operand is zero extended, else sign */
IMF_PC_TO_R31 = 1L<<7, /**< PC value will be stored to register R31/RA */
IMF_BJR_REQ_RS = 1L<<8, /**< Branch or jump operation reguires RS value */
IMF_BJR_REQ_RT = 1L<<9, /**< Branch or jump operation requires RT value */
IMF_ALU_SHIFT = 1L<<10, /**< Operation is shift of RT by RS or SHAMT */
IMF_MEM = 1L<<11, /**< Instruction is memory access instruction */
IMF_ALU_REQ_RS = 1L<<12, /**< Execution phase/ALU requires RS value */
IMF_ALU_REQ_RT = 1L<<13, /**< Execution phase/ALU/mem requires RT value */
IMF_READ_HILO = 1L<<14, /**< Operation reads value from HI or LO registers */
IMF_WRITE_HILO = 1L<<15, /**< Operation writes value to HI and/or LO registers */
IMF_PC8_TO_RT = 1L<<16, /**< PC value will be stored in RT specified register */
IMF_BRANCH = 1L<<17, /**< Operation is conditional or unconditional branch
or branch and link when PC_TO_R31 is set */
IMF_JUMP = 1L<<18, /**< Jump operation - J, JAL, JR or JALR */
IMF_BJ_NOT = 1L<<19, /**< Negate condition for branch instructiion */
IMF_BGTZ_BLEZ = 1L<<20, /**< BGTZ/BLEZ, else BEGT/BLTZ or BEQ, BNE when RT */
IMF_NB_SKIP_DS = 1L<<21, /**< Skip instruction in delay slot if branch not taken */
IMF_EXCEPTION = 1L<<22, /**< Instruction causes synchronous exception */
IMF_STOP_IF = 1L<<23, /**< Stop instruction fetch until instruction processed */
};
class Instruction {
public:
Instruction();
Instruction(std::uint32_t inst);
Instruction(std::uint8_t opcode, std::uint8_t rs, std::uint8_t rt, std::uint8_t rd, std::uint8_t shamt, std::uint8_t funct); // Type R
Instruction(std::uint8_t opcode, std::uint8_t rs, std::uint8_t rt, std::uint16_t immediate); // Type I
Instruction(std::uint8_t opcode, std::uint32_t address); // Type J
Instruction(const Instruction&);
enum Type {
T_R,
T_I,
T_J,
T_UNKNOWN
};
std::uint8_t opcode() const;
std::uint8_t rs() const;
std::uint8_t rt() const;
std::uint8_t rd() const;
std::uint8_t shamt() const;
std::uint8_t funct() const;
std::uint8_t cop0sel() const;
std::uint16_t immediate() const;
std::uint32_t address() const;
std::uint32_t data() const;
enum Type type() const;
enum InstructionFlags flags() const;
enum AluOp alu_op() const;
enum AccessControl mem_ctl() const;
enum ExceptionCause encoded_exception() const;
void flags_alu_op_mem_ctl(enum InstructionFlags &flags,
enum AluOp &alu_op, enum AccessControl &mem_ctl) const;
bool is_break() const;
bool operator==(const Instruction &c) const;
bool operator!=(const Instruction &c) const;
Instruction &operator=(const Instruction &c);
QString to_str(std::int32_t inst_addr = 0) const;
static Instruction from_string(QString str, bool *pok = nullptr, std::uint32_t inst_addr = 0);
private:
std::uint32_t dt;
};
}
Q_DECLARE_METATYPE(machine::Instruction)
#endif // INSTRUCTION_H
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