public void EX()
throws IrregularStringOfBitsException, IntegerOverflowException, TwosComplementSumException {
// getting strings from temporary registers
String rt = TR[RT_FIELD].getBinString();
String rs = TR[RS_FIELD].getBinString();
String shift = "", rd;
// getting the low order 5 bits from rs register
shift = rs.substring(59);
// cutting the high part of register
rt = rt.substring(32, 64);
int shift_value = Converter.binToInt(shift, true);
// composing new shifted value and performing sign extension
StringBuffer buf = new StringBuffer();
for (int i = 0; i < 32; i++) {
buf.append(rt.charAt(0));
}
buf.append(rt.substring(shift_value));
// filling the remaining bits with 0
for (int i = 0; i < shift_value; i++) {
buf.append('0');
}
String target = new String(buf);
TR[RD_FIELD].setBits(target, 0);
if (enableForwarding) {
doWB();
}
}
public void MEM()
throws IrregularStringOfBitsException, NotAlignException, MemoryElementNotFoundException,
AddressErrorException, IrregularWriteOperationException {
super.MEM(); // unlock the fp register in order to avoid WAW hazards
// restoring the address from the temporary register
long address = TR[OFFSET_PLUS_BASE].getValue();
// For the trace file
Dinero din = Dinero.getInstance();
din.Load(Converter.binToHex(Converter.positiveIntToBin(64, address)), 4);
MemoryElement memEl = memory.getCellByAddress(address);
// reading from the memory element and saving values on LMD register
TR[LMD_REGISTER].writeWord(memEl.readWord((int) (address % 8)));
if (enableForwarding) {
doWB();
}
}
/**
* Returns the signed numeric decimal value stored in this register.
*
* @return signed numerical value stored in this register
*/
public long getValue() {
try {
return Converter.binToLong(this.getBinString(), false);
} catch (IrregularStringOfBitsException e) {
e.printStackTrace();
this.reset(false); // azzeriamo il registro
return 0;
}
}
public void pack() throws IrregularStringOfBitsException {
// conversion of instruction parameters of "params" list to the "repr" form (32 binary value)
repr.setBits(OPCODE_VALUE, OPCODE_VALUE_INIT);
repr.setBits(Converter.intToBin(RS_FIELD_LENGTH, params.get(RS_FIELD)), RS_FIELD_INIT);
repr.setBits(Converter.intToBin(RT_FIELD_LENGTH, params.get(RT_FIELD)), RT_FIELD_INIT);
}