/
main.py
683 lines (624 loc) · 20.1 KB
/
main.py
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#!/usr/bin/python3.2
import sys
from PyQt4 import QtGui, QtCore
from gui import Ui_Form
def inttohex(int_):
"""
Convert an integer to 4 digit hex string
@param int_ integer to be converted
@return 4 digit hex string
"""
if int_ >= 0:
return ("{0:0>4s}".format(hex(int_ % (1 << 16))[2:])).upper()
else:
return (hex((int_ + (1 << 16)) % (1 << 16)).upper()[2:]).upper()
def inttobin(int_):
"""
convert an integer to 16 bit binary sting
@param int_ integer to be converted
@return 16 bit binary string
"""
if int_ >= 0:
return "{0:0>16s}".format(bin(int_)[2:])
else:
return bin((int_ + (1 << 16)) % (1 << 16)).upper()[2:]
def hextobin(hex_):
"""
convert 4 digit hex string to 16 bit binary string
@param hex_ 4 digit hex string
@return 16 bit binary string
"""
return inttobin(int(hex_, 16))
def bintohex(bin_):
"""
convert a 16 bit binary string to 4 digit hex string
@param bin_ 16 bit binary string
@return 4 digit hex string
"""
return inttohex(int(bin_, 2))
class PyASM(QtGui.QMainWindow):
"""
Application class responsible for the instantiation of the GUI and simulation of the Software Machine.
@extends QtGui.QMainWindow framework for building the application's GUI
"""
def __init__(self):
"""
Constructor.
Inititalizes GUI, event handling, hotkeys, etc
"""
super(PyASM, self).__init__()
self.ui = Ui_Form(); self.ui.setupUi(self)
self.ui.step.clicked.connect(self.run)
self.ui.run.clicked.connect(self.runFull)
self.initSIM()
self.ui.memory.verticalHeader().setVisible(False)
self.ui.memory.setRowCount(32768)
self.newItem = QtGui.QTableWidgetItem
self.setWindowTitle('Software Machine v1.3')
openFile = QtGui.QAction('&Open', self)
openFile.setShortcut('Ctrl+O')
openFile.triggered.connect(self.loadProgramFromFile)
refreshProgram = QtGui.QAction('&Refresh', self)
refreshProgram.setShortcut('Ctrl+R')
refreshProgram.triggered.connect(self.loadInstructions)
aboutProgram = QtGui.QAction('&About', self)
aboutProgram.triggered.connect(self.aboutProgram)
exitAction = QtGui.QAction('&Exit', self)
exitAction.setShortcut('Ctrl+Q')
exitAction.triggered.connect(QtGui.qApp.quit)
self.ui.r0.clicked.connect(self.showRegInfoR0)
self.ui.r1.clicked.connect(self.showRegInfoR1)
self.ui.r2.clicked.connect(self.showRegInfoR2)
self.ui.r3.clicked.connect(self.showRegInfoR3)
self.ui.r4.clicked.connect(self.showRegInfoR4)
self.ui.r5.clicked.connect(self.showRegInfoR5)
self.ui.r6.clicked.connect(self.showRegInfoR6)
self.ui.r7.clicked.connect(self.showRegInfoR7)
self.ui.pc.clicked.connect(self.showRegInfoPC)
menubar = self.menuBar()
fileMenu = menubar.addMenu('&Menu')
fileMenu.addAction(openFile)
fileMenu.addAction(refreshProgram)
fileMenu.addAction(exitAction)
helpMenu = menubar.addMenu('&Help')
helpMenu.addAction(aboutProgram)
stepButton = QtGui.QAction(self)
stepButton.setShortcut('F11')
stepButton.triggered.connect(self.run)
self.ui.step.addAction(stepButton)
runButton = QtGui.QAction(self)
runButton.setShortcut('F5')
runButton.triggered.connect(self.runFull)
self.ui.run.addAction(runButton)
self.running = "on"
row = 0
i = 0
for row in range(0, 32768):
self.ui.memory.setItem(row, 0, self.newItem(inttohex(i)))
self.ui.memory.setItem(row, 1, self.newItem("0000"))
self.ui.memory.item(row, 0).setFlags(QtCore.Qt.ItemIsSelectable)
i += 2
self.ui.flags.setText("Flags:\nZ E G L .\n")
self.updateUI()
self.show()
def updateUI(self):
"""
Updates the the GUI with the backend data used by the simulator
"""
self.ui.r0.setText("R0: " + self.regbank["000"])
self.ui.r1.setText("R1: " + self.regbank["001"])
self.ui.r2.setText("R2: " + self.regbank["010"])
self.ui.r3.setText("R3: " + self.regbank["011"])
self.ui.r4.setText("R4: " + self.regbank["100"])
self.ui.r5.setText("R5: " + self.regbank["101"])
self.ui.r6.setText("R6: " + self.regbank["110"])
self.ui.r7.setText("R7: " + self.regbank["111"])
self.regbank["pc"] = inttohex(2 * self.pc)
self.ui.pc.setText("PC: " + self.regbank["pc"])
tmp = hextobin(self.regbank["flags"])
self.ui.flagZ.setCheckState(int(tmp[-16]))
self.ui.flagE.setCheckState(int(tmp[-15]))
self.ui.flagG.setCheckState(int(tmp[-14]))
self.ui.flagL.setCheckState(int(tmp[-13]))
def initSIM(self):
"""
Initialize the backend of the Simulator.
"""
self.instructionTable = {"000000":self.instruction_NEG,
"000001":self.instruction_AND,
"000010":self.instruction_XOR,
"000011":self.instruction_OR,
"000100":self.instruction_LSR,
"000101":self.instruction_LSL,
"000110":self.instruction_ASR,
"000111":self.instruction_TST,
"001000":self.instruction_ROR,
"001001":self.instruction_ROL,
"001010":self.instruction_HLT,
"001011":None,
"001100":self.instruction_MOVB,
"001101":self.instruction_MOV,
"001110":self.instruction_CMP,
"001111":self.instruction_JMP,
"010000":self.instruction_ADD,
"010001":self.instruction_SUB,
"010010":self.instruction_PUSH,
"010011":self.instruction_POP,
"010100":self.instruction_CALL,
"010101":self.instruction_RET
}
self.regbank = {"000":"0000",
"001":"0000",
"010":"0000",
"011":"0000",
"100":"0000",
"101":"0000",
"110":"0000",
"111":"0000",
"flags":"0000",
"pc":"0000",
"sp":"FFFE"
}
self.pc = 0
self.prevpc = 0
self.initialPC = 0
self.initialLoadAddress = 0
def loadProgramFromFile(self):
"""
Load a program from a file. Opens a QFileDialog instance to read the input program file to the text editor in the Simulator.
"""
file = QtGui.QFileDialog.getOpenFileName(self, 'Open File', '.')
file = open(file, 'r')
self.ui.instructions.setText(file.read())
file.close()
self.loadInstructions()
def loadInstructions(self):
"""
Instructions to be given to the simulator are read from the text editor and are loaded to memory.
"""
self.regbank["000"] = "0000"
self.regbank["001"] = "0000"
self.regbank["010"] = "0000"
self.regbank["011"] = "0000"
self.regbank["100"] = "0000"
self.regbank["101"] = "0000"
self.regbank["110"] = "0000"
self.regbank["111"] = "0000"
self.regbank["flags"] = "0000"
self.regbank["pc"] = "0000"
self.regbank["sp"] = "FFFE"
addr, ok = QtGui.QInputDialog.getText(self, 'Input Dialog', 'Enter starting address to place instructions (default : 0000)')
if not ok or addr == "":
addr = "0000"
addr = int(addr, 16)
tmp, ok = QtGui.QInputDialog.getText(self, 'Input Dialog', 'Enter value of PC (default : 0000)')
if not ok or tmp == "":
tmp = "0000"
self.pc = int(int(tmp, 16)/2)
i = addr
instructions = self.ui.instructions.toPlainText().split("\n")
for inst in instructions:
if inst != "":
self.setWord(i, inst)
i += 2
self.updateUI()
self.defaultColor = self.ui.memory.item(0, 0).background()
self.running = "on"
self.previnst = ""
def run(self):
"""
Runs the next instruction (if any). Equivalent to 'step'
"""
if self.running == "on" and self.pc < 32768:
if self.previnst != "":
self.ui.memory.item(self.prevpc-1, 1).setBackground(self.defaultColor)
if self.previnst[-2:] == "10" or self.previnst[-2:] == "11" or self.previnst[-7:-5] == "10" or self.previnst[-7:-5] == "11":
self.ui.memory.item(self.prevpc-2, 1).setBackground(self.defaultColor)
inst = hextobin(self.nextInstruction())
self.simulateInstruction(inst)
self.updateUI()
self.previnst = inst
def runFull(self):
"""
Runs the whole program (or the remaining) till the end of the program. Equivalent to 'run'
"""
while self.running == "on" and self.pc < 32768:
self.run()
def nextInstruction(self):
"""
Obtains the next word from memory which can be used either as instruction/data and highlights it.
@return 4 digit hex string
"""
inst = self.ui.memory.item(self.pc, 1).text()
self.ui.memory.item(self.pc, 1).setBackground(QtGui.QBrush(QtGui.QColor(0, 255, 255)))
self.pc += 1
self.prevpc = self.pc
return inst
# boundary conditions to be added
def simulateInstruction(self, inst):
"""
Starts simulation of the instruction provided.
@param inst instruction to be simulated.
"""
self.instructionTable[inst[-16:-10]](inst)
def instruction_NEG(self, inst):
"""
Simulation of NEG (negation)
Details in specs document
@param inst NEG instruction
"""
src1 = self.getOperandOneWord(inst)
self.setDestinationWord(inst, ~src1)
def instruction_AND(self, inst):
"""
Simulation of AND (bitwise and)
Details in specs document
@param inst AND instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src1 & src2)
def instruction_XOR(self, inst):
"""
Simulation of XOR (bitwise xor)
Details in specs document
@param inst NEG instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src1 ^ src2)
def instruction_OR(self, inst):
"""
Simulation of OR (or)
Details in specs document
@param inst OR instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src1 | src2)
def instruction_LSR(self, inst):
"""
Simulation of LSR (Logical Right-Shift)
Details in specs document
@param inst LSR instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src2 >> src1)
def instruction_LSL(self, inst):
"""
Simulation of LSL (Logical Left-Shift) - Also applies for ASL (Arithmetic Left-Shift)
Details in specs document
@param inst LSL instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src2 << src1)
def instruction_ASR(self, inst):
"""
Simulation of ASR (Arithmetic Right-Shft)
Details in specs document
@param inst ASL instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
if src2 > 32767:
src2 -= 65536
self.setDestinationWord(inst, src2 >> src1)
def instruction_TST(self, inst):
"""
Simulation of TST (Test bit)
Details in specs document
@param inst TST instruction
"""
if inst[-7:-5] == "00":
src = int(self.regbank[inst[-10:-7]], 16)
elif inst[-7:-5] == "01":
src = int(self.getWord(int(self.regbank[inst[-10:-5]], 16)), 16)
bit = 2**(int(inst[-4:], 2))
if bit & src == 0:
tmp = "1000000000000000"
else:
tmp = "0000000000000000"
self.regbank["flags"] = bintohex(tmp)
def instruction_ROR(self, inst):
"""
Simulation of ROR (Rotate Right)
Details in specs document
@param inst ROR instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, (src2 >> src1) | (src2 << (16-src1)))
def instruction_ROL(self, inst):
"""
Simulation of ROL (Rotate Left)
Details in specs document
@param inst ROL instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, (src2 << src1) | (src2 >> (16-src1)))
def instruction_HLT(self, inst):
"""
Simulation of HLT (Halt)
Details in specs document
@param inst HLT instruction
"""
self.running = "off"
def instruction_MOVB(self, inst):
"""
Simulation of MOVB (Move byte)
Details in specs document
@param inst instruction
"""
src1 = self.getOperandOneByte(inst)
self.setDestinationByte(inst, src1)
def instruction_MOV(self, inst):
"""
Simulation of MOV (Move)
Details in specs document
@param inst MOV instruction
"""
src1 = self.getOperandOneWord(inst)
self.setDestinationWord(inst, src1)
def instruction_CMP(self, inst):
"""
Simulation of CMP (Compare)
Details in specs document
@param inst CMP instruction
"""
src2 = self.getOperandOneWord(inst)
src1 = self.getOperandTwoWord(inst)
self.updateFlags(src1, src2)
def instruction_JMP(self, inst):
"""
Simulation of JMP (Jump/Branch). Different types of jumping use JMP with different flags set.
Details in specs document
@param inst instruction
"""
if inst[-2:] == "00":
jmpdest = int(self.regbank[inst[-5:-2]], 16)
elif inst[-2:] == "01":
val = int(self.regbank[inst[-5:-2]], 16)
if val > 32767:
val -= 65536
jmpdest = int(self.regbank["pc"], 16) + val
elif inst[-2:] == "10":
jmpdest = int(self.nextInstruction(), 16)
elif inst[-2:] == "11":
val = int(self.nextInstruction(), 16)
if val > 32767:
val -= 65536
jmpdest = int(self.regbank["pc"], 16) + val
if inst[-10] == "1":
self.pc = int(jmpdest / 2)
elif int(inst[-9:-5], 2) & int(hextobin(self.regbank["flags"])[-16:-12], 2) > 0:
self.pc = int(jmpdest / 2)
def instruction_ADD(self, inst):
"""
Simulation of ADD (addition)
Details in specs document
@param inst ADD instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src1 + src2)
def instruction_SUB(self, inst):
"""
Simulation of SUB (subtraction)
Details in specs document
@param inst SUB instruction
"""
src1 = self.getOperandOneWord(inst)
src2 = self.getOperandTwoWord(inst)
self.setDestinationWord(inst, src2 - src1)
def instruction_PUSH(self, inst):
"""
Simulation of PUSH (push to stack)
Details in specs document
@param inst PUSH instruction
"""
intsp = int(self.regbank["sp"], 16)
self.setWord(intsp, inttohex(self.getOperandOneWord(inst)))
self.regbank["sp"] = inttohex(intsp-2)
def instruction_POP(self, inst):
"""
Simulation of POP (pop from stack)
Details in specs document
@param inst POP instruction
"""
intsp = int(self.regbank["sp"], 16) + 2
self.setDestinationWord(inst, int(self.getWord(intsp), 16))
self.regbank["sp"] = inttohex(intsp)
pass
def instruction_CALL(self, inst):
"""
Simulation of CALL (sub-routine call)
Details in specs document
@param inst CALL instruction
"""
if inst[-2:] == "00":
jmpdest = int(self.regbank[inst[-5:-2]], 16)
elif inst[-2:] == "01":
val = int(self.regbank[inst[-5:-2]], 16)
if val > 32767:
val -= 65536
jmpdest = int(self.regbank["pc"], 16) + val
elif inst[-2:] == "10":
jmpdest = int(self.nextInstruction(), 16)
elif inst[-2:] == "11":
val = int(self.nextInstruction(), 16)
if val > 32767:
val -= 65536
jmpdest = int(self.regbank["pc"], 16) + val
intsp = int(self.regbank["sp"], 16)
self.setWord(intsp, inttohex(2*self.pc))
self.regbank["sp"] = inttohex(intsp-2)
self.pc = int(jmpdest / 2)
def instruction_RET(self, inst):
"""
Simulation of RET (sub-routine return)
Details in specs document
@param inst RET instruction
"""
intsp = int(self.regbank["sp"], 16) + 2
self.pc = int(int(self.getWord(intsp), 16) / 2)
self.regbank["sp"] = inttohex(intsp)
def getOperandOneWord(self, inst):
"""
Gets a word denoted by bits 2 to 5 of the instruction
@param inst instruction which contains flags set for the method of data access
@return 4 digit hex string
"""
if inst[-2:] == "00":
src1 = int(self.regbank[inst[-5:-2]], 16)
elif inst[-2:] == "01":
src1 = int(self.getWord(int(self.regbank[inst[-5:-2]], 16)), 16)
elif inst[-2:] == "10":
src1 = int(self.nextInstruction(), 16)
return src1
def getOperandOneByte(self, inst):
"""
Gets a byte denoted by bits 2 to 5 of the instruction
@param inst instruction which contains flags set for the method of data access
@return 2 digit hex string
"""
if inst[-2:] == "00":
src1 = int(self.regbank[inst[-5:-2]][-2:], 16)
elif inst[-2:] == "01":
src1 = int(self.getByte(int(self.regbank[inst[-5:-2]], 16))[-2:], 16)
elif inst[-2:] == "10":
src1 = int((self.nextInstruction())[-2:], 16)
return src1
def getOperandTwoWord(self, inst):
"""
Gets a word denoted by bits 7 to 10 of the instruction
@param inst instruction which contains flags set for the method of data access
@return 4 digit hex string
"""
if inst[-7:-5] == "00":
src2 = int(self.regbank[inst[-10:-7]], 16)
elif inst[-7:-5] == "01":
src2 = int(self.getWord(int(self.regbank[inst[-10:-7]], 16)), 16)
return src2
def getOperandTwoByte(self, inst):
"""
Gets a byte denoted by bits 7 to 10 of the instruction
@param inst instruction which contains flags set for the method of data access
@return 2 digit hex string
"""
if inst[-7:-5] == "00":
src2 = int(self.regbank[inst[-10:-7]][-2:], 16)
elif inst[-7:-5] == "01":
src2 = int(self.getWord(int(self.regbank[inst[-10:-7]], 16))[-2:], 16)
return src2
def setDestinationWord(self, inst, dest):
"""
Sets a word denoted by bits 7 to 10 of the instruction
@param inst instruction which contains flags set for the method of data access
"""
if inst[-7:-5] == "00":
self.regbank[inst[-10:-7]] = inttohex(dest)
elif inst[-7:-5] == "01":
self.setWord(int(self.regbank[inst[-10:-7]], 16), inttohex(dest))
def setDestinationByte(self, inst, dest):
"""
Sets a byte denoted by bits 7 to 10 of the instruction
@param inst instruction which contains flags set for the method of data access
"""
if inst[-7:-5] == "00":
self.regbank[inst[-10:-7]] = self.regbank[inst[-10:-17]][-4:-2] + inttohex(dest)[-2:]
elif inst[-7:-5] == "01":
self.setByte(int(self.regbank[inst[-10:-7]], 16), inttohex(dest)[-2:])
def getByte(self, byteNo):
"""
Gets a byte of data from memory
@param byteNo the byte to be obtained
@return 2 digit hex string
"""
if byteNo % 2 == 0:
return self.ui.memory.item(byteNo, 1)[:2]
else:
return self.ui.memory.item(byteNo - 1, 1)[2:]
def setByte(self, byteNo, val):
"""
Sets a byte of data in memory
@param byteNo the byte to be set
@param val value to be set in memory
"""
word = self.ui.memory.item(byteNo, 1)
if byteNo % 2 == 0:
word = val + word[2:]
else:
word = word[:2] + val
word = self.ui.memory.setItem(byteNo - (byteNo % 2), 1, self.newItem(word))
def getWord(self, wordNo):
"""
Gets a word of data from memory
@param wordNo the word to be obtained
@return 4 digit hex string
"""
wordNo = int(wordNo / 2)
return self.ui.memory.item(wordNo, 1).text()
def setWord(self, wordNo, val):
"""
Sets a word of data in memory
@param wordNo the word to be set
@param val value to be set in memory
"""
wordNo = int(wordNo / 2)
self.ui.memory.setItem(wordNo, 1, self.newItem(val))
def updateFlags(self, src1, src2):
"""
Update flag register with respect to the values provided
@param src1 1st value, operand one
@param src2 2nd value, operand two
"""
flags = hextobin(self.regbank["flags"])
if src1 == src2 != 0:
flags = "0100" + flags[-12:]
elif src1 == src2 == 0:
flags = "1100" + flags[-12:]
elif src1 < src2:
flags = "0001" + flags[-12:]
elif src1 > src2:
flags = "0010" + flags[-12:]
self.regbank["flags"] = bintohex(flags)
def aboutProgram(self):
"""
Displays a message box about the Simulator
"""
QtGui.QMessageBox.information(self, 'About', 'Software Machine\nVersion 1.3\n\nDesigned and Developed by\nSathyam M Vellal', QtGui.QMessageBox.Ok)
def showRegInfoR0(self):
self.showRegInfo("000")
def showRegInfoR1(self):
self.showRegInfo("001")
def showRegInfoR2(self):
self.showRegInfo("010")
def showRegInfoR3(self):
self.showRegInfo("011")
def showRegInfoR4(self):
self.showRegInfo("100")
def showRegInfoR5(self):
self.showRegInfo("101")
def showRegInfoR6(self):
self.showRegInfo("110")
def showRegInfoR7(self):
self.showRegInfo("111")
def showRegInfoPC(self):
self.showRegInfo("pc")
def showRegInfo(self, reg):
"""
Shows a dialog box with the info of the register
"""
info = ""
info += "Integer : " + str(int(self.regbank[reg], 16)) + "\n"
info += "Hexadecimal : " + self.regbank[reg] + "\n"
bin = hextobin(self.regbank[reg])
info += "Binary : " + bin[-16:-12] + " " + bin[-12:-8] + " " + bin[-8:-4] + " " + bin[-4:] + "\n"
QtGui.QMessageBox.information(self, 'Register Information', info, QtGui.QMessageBox.Ok)
if __name__ == '__main__':
qApp = QtGui.QApplication(sys.argv)
pyasm = PyASM()
sys.exit(qApp.exec_())