145 lines
No EOL
3 KiB
C++
145 lines
No EOL
3 KiB
C++
#ifndef MACHINE_H
|
|
#define MACHINE_H
|
|
|
|
#include <string>
|
|
#include <iostream>
|
|
#include <vector>
|
|
|
|
#include "device.h"
|
|
#include "input_device.h"
|
|
#include "output_device.h"
|
|
#include "file_device.h"
|
|
#include "opcode.h"
|
|
|
|
#include <memory>
|
|
|
|
#define MEMORY_SIZE 65536
|
|
#define NUM_DEVICES 256
|
|
|
|
|
|
using std::string;
|
|
using std::cerr;
|
|
using std::endl;
|
|
using std::cout;
|
|
|
|
|
|
class Machine {
|
|
public:
|
|
Machine();
|
|
~Machine();
|
|
|
|
// Accessor methods for registers
|
|
int getA() const { return A; }
|
|
void setA(int value) { A = value; }
|
|
|
|
int getB() const { return B; }
|
|
void setB(int value) { B = value; }
|
|
|
|
int getX() const { return X; }
|
|
void setX(int value) { X = value; }
|
|
|
|
int getL() const { return L; }
|
|
void setL(int value) { L = value; }
|
|
|
|
int getS() const { return S; }
|
|
void setS(int value) { S = value; }
|
|
|
|
int getT() const { return T; }
|
|
void setT(int value) { T = value; }
|
|
|
|
int getPC() const { return PC; }
|
|
void setPC(int value) { PC = value; }
|
|
|
|
int getSW() const { return SW; }
|
|
void setSW(int value) { SW = value; }
|
|
|
|
double getF() const { return F; }
|
|
void setF(double value) { F = value; }
|
|
|
|
int getReg(int regNum) const;
|
|
void setReg(int regNum, int value);
|
|
|
|
// Memory access methods
|
|
int getByte(int address);
|
|
void setByte(int address, int value);
|
|
|
|
int getWord(int address);
|
|
void setWord(int address, int value);
|
|
|
|
double getFloat(int address);
|
|
void setFloat(int address, double value);
|
|
|
|
|
|
// Device access methods
|
|
Device& getDevice(int num);
|
|
void setDevice(int num, std::shared_ptr<Device> device);
|
|
// Set a file device at index `num` using the provided filename.
|
|
void setFileDevice(int num, const std::string &filename);
|
|
|
|
|
|
// Fetch and execute instructions
|
|
int fetch();
|
|
void execute();
|
|
|
|
bool execF1(int opcode);
|
|
bool execF2(int opcode, int operand);
|
|
bool execSICF3F4(int opcode, int ni, int operand);
|
|
|
|
// error handling methods
|
|
void notImplemented(string mnemonic);
|
|
void invalidOpcode(int opcode);
|
|
void invalidAddressing();
|
|
void divisionByZero(int opcode);
|
|
void undefinedHandler(int opcode);
|
|
|
|
private:
|
|
// registers
|
|
int A, B, X, L, S, T, PC, SW;
|
|
double F;
|
|
|
|
// memory
|
|
unsigned char memory[MEMORY_SIZE];
|
|
|
|
// devices
|
|
std::vector<std::shared_ptr<Device>> devices;
|
|
// fallback device returned when device slot is empty/invalid
|
|
Device fallbackDevice;
|
|
};
|
|
|
|
// Convert integer to 24-bit signed SIC representation
|
|
inline int toSIC24(int value) {
|
|
value &= 0xFFFFFF;
|
|
if (value & 0x800000) {
|
|
value -= 0x1000000;
|
|
}
|
|
return value;
|
|
}
|
|
|
|
inline int setCC(int sw, int cc) {
|
|
sw &= ~CC_MASK;
|
|
sw |= (cc & CC_MASK);
|
|
return sw;
|
|
}
|
|
|
|
inline int sic_comp(int a, int b, int sw) {
|
|
int sa = toSIC24(a);
|
|
int sb = toSIC24(b);
|
|
|
|
int cc;
|
|
if (sa < sb) {
|
|
cc = CC_LT;
|
|
} else if (sa == sb) {
|
|
cc = CC_EQ;
|
|
} else {
|
|
cc = CC_GT;
|
|
}
|
|
|
|
return setCC(sw, cc);
|
|
}
|
|
|
|
inline int getCC(int sw) {
|
|
return sw & CC_MASK;
|
|
}
|
|
|
|
|
|
#endif // MACHINE_H
|