public String get_cache_mem() {
return stage_mem.print();
}
public boolean runSingleSycle() {
if (currentLineOfInstructions < lineOfInstructions) {
stage_if.action(modeBit);
stage_id.action(modeBit);
stage_exe.action(modeBit);
if (programs != null) {
for (PCB program : programs) {
program.waitAction();
}
}
if (stage_exe.isJump()) { // PC & 0xf0000000
String pc4bit = "0000";
String func_sign = "0111111111111111111";
String func_first = pc4bit.concat(func_sign);
try {
String func_str =
stage_exe
.getJ_pc()
.substring(stage_exe.getJ_pc().length() - 9, stage_exe.getJ_pc().length() - 2);
func_str = String.valueOf(Integer.parseInt(func_str, 2));
Method m = Computer.class.getMethod("func" + func_str);
m.invoke(this);
} catch (NoSuchMethodException e) {
int old_pc = getPC();
int pcbits = old_pc / (2 ^ 28);
// not added pc to sign but it's ready for use then
int offset = Integer.parseInt(stage_exe.getJ_pc(), 2) / 4;
stage_if.setPC(offset);
if (stage_exe.isRegwrite()) { // it's means have jal (our agreement)
stage_exe.getExemem().setALU_result(old_pc); // this old_pc \
// should not increment because it incremented in IF stage
stage_exe.getExemem().setWrite_Register(31);
// use mips structure to save new_pc in ra (not assign directly)
}
} catch (Exception e) {
}
}
if (stage_exe.isJumpReg()) {
int pc = stage_exe.getIdexe().getRS_DATA();
stage_exe.getExemem().setControlBits("0000000000100");
stage_if.setPC(pc);
}
if (stage_exe.isBranch()) {
if (exemem.getALU_result() == 0 && !stage_exe.isNot()) {
int offset;
offset = Integer.parseInt(stage_exe.getIdexe().getSignExt(), 2);
stage_if.setPC(stage_if.getPC() + offset);
}
if (exemem.getALU_result() != 0 && stage_exe.isNot()) {
int offset = 0;
String address = stage_exe.getIdexe().getSignExt();
if (address.charAt(0) == '1') { // must use 2'scompliment method for negative numbers
boolean flag = true;
String newAddress = "";
for (int i = address.length() - 1; i >= 0; i--) {
if (flag) {
char ch = address.charAt(i);
newAddress = ch + newAddress;
if (ch == '1') {
flag = false;
}
} else {
char ch = address.charAt(i);
if (ch == '1') {
newAddress = '0' + newAddress;
}
if (ch == '0') {
newAddress = '1' + newAddress;
}
}
offset = Integer.parseInt(newAddress, 2);
offset = -1 * offset;
}
} else {
offset = Integer.parseInt(stage_exe.getIdexe().getSignExt(), 2);
}
stage_if.setPC(stage_if.getPC() + offset);
}
}
if (stage_exe.isSyscall()) {
System.out.println("here is Syscall");
enableintrrupt = false;
modeBit = true;
interruptBit = true;
interruptReason = 1; // reason 1 for syscall in program
}
stage_mem.action(modeBit, aa);
stage_wb.action(modeBit);
currentLineOfInstructions = stage_if.getPC();
timer.action();
if (timer.check_timer() && enableintrrupt) {
interruptReason = 2;
interruptBit = true;
modeBit = true; // means in kernel Mode now
}
if (interruptBit) {
int syscallReason = getRegisterFile().getRegfile(2);
getRegisterFile().setReg(27, interruptReason);
if (currentProgram != null) {
currentProgram.setPC(stage_if.getPC());
}
switch (interruptReason) {
case 1:
switch (syscallReason) {
case 10:
System.out.println("exit");
defaultRegisters.setReg(27, interruptReason);
defaultRegisters.setReg(2, 10);
break;
case 20:
defaultRegisters.setReg(27, interruptReason);
defaultRegisters.setReg(2, 20);
break;
case 30:
int loc = getRegisterFile().getRegfile(4);
int ch = getRegisterFile().getRegfile(5);
int col = getRegisterFile().getRegfile(6);
me.changeMonitor(loc, ch, col);
}
;
case 2:
// for timer intrupt
break;
case 3:
// for exception
break;
}
stage_if.setPC(0);
currentLineOfInstructions = 0;
lineOfInstructions = stage_if.getIns_mem().size();
interruptBit = false;
stage_id.regfile = defaultRegisters;
}
return true;
} else {
System.out.println("end of file ...");
setRunable(true);
return false;
}
}