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199
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1 from target import Register, Instruction, Target
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2
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3 # Target description for the MSP430 processor
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4
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5 class MSP430Reg(Register):
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6 def __init__(self, num, name):
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7 super().__init__(name)
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8 self.num = num
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9
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10 # 8 bit registers:
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11 PCB = MSP430Reg(0, 'r0')
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12 r13 = MSP430Reg(13, 'r13')
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13 r14 = MSP430Reg(14, 'r14')
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14 r15 = MSP430Reg(15, 'r15')
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15
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16 # .. etc
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17
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18 #GR8 = RegisterClass((PCB, R15B))
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19
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200
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20 # Two operand arithmatic instructions:
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21
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22 class TwoOpArith(Instruction):
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23 operands = (MSP430Reg, MSP430Reg)
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24 def __init__(self, op1, op2):
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25 self.op1 = op1
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26 self.op2 = op2
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27 def encode(self):
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28 # TODO:
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29 b1 = (self.opcode << 4)
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30 b2 = 0
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31 ba = bytearray([b1, b2])
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32 return bytes(ba)
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33
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200
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34 class mov_ins(TwoOpArith):
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35 # class variables:
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36 mnemonic = 'mov'
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37 opcode = 4
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38
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39 class add_ins(TwoOpArith):
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40 mnemonic = 'add'
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41 opcode = 5
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42
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43 class MSP430(Target):
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44 def __init__(self):
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45 self.registers = [PCB, r13, r14, r15]
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46 self.instructions = [mov_ins, add_ins]
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47
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48 t = MSP430()
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49
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