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def render(instr):
if 'op' in instr:
return "{} {}".format(instr['mnemonic'], instr['op'])
else:
return instr['mnemonic']
def disassemble(blob, offset):
instr = {}
instr['length'] = 1
instrbytes = blob[offset:offset + 2]
# instrbytes.reverse()
print("Decoding {}{}...".format(hex(instrbytes[0])[2:], hex(instrbytes[1])[2:]))
if instrbytes[0] == 0x00:
print(hex(instrbytes[1]))
# there's a few instructions here...
if instrbytes[1] == 0xff:
instr['mnemonic'] = 'reset'
else:
instr['mnemonic'] = [
'nop',
'BAD',
'BAD',
'sleep',
'clrwdt',
'push',
'pop',
'daw',
'tblrd*',
'tblrd*+',
'tblrd*-',
'tblrd+*',
'tblwr*',
'tblwr*+',
'tblwr*-',
'tblwr+*',
'retfie',
'retfie fast',
'return',
'return fast',
'callw*'][instrbytes[1]]
if instrbytes[0] == 0x01:
if instrbytes[1] > 0xf:
instr['mnemonic'] = 'BAD'
else:
instr['mnemonic'] = 'movlb'
instr['op'] = "#" + str(instrbytes[1])
elif instrbytes[0] == 0x02 or instrbytes[0] == 0x03:
instr['mnemonic'] = 'mulwf'
instr['op'] = 'TODO'
elif instrbytes[0] == 0x04 or instrbytes[0] == 0x05 or instrbytes[0] == 0x06 or instrbytes[0] == 0x07:
instr['mnemonic'] = 'decf'
instr['op'] = 'TODO'
elif instrbytes[0] == 0x08:
instr['mnemonic'] = 'sublw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x09:
instr['mnemonic'] = 'iorlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0a:
instr['mnemonic'] = 'xorlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0b:
instr['mnemonic'] = 'andlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0c:
instr['mnemonic'] = 'retlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0d:
instr['mnemonic'] = 'mullw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0e:
instr['mnemonic'] = 'movlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] == 0x0f:
instr['mnemonic'] = 'addlw'
instr['op'] = '#' + hex(instrbytes[1])
elif instrbytes[0] >= 0x20 and instrbytes[0] <= 0x5f:
mnemonicSel = instrbytes[0] >> 2
instr['mnemonic'] = [
'iorwf',
'andwf',
'xorwf',
'comf',
'addwfc',
'addwf',
'incf',
'decfsz',
'rrcf',
'rlcf',
'swapf',
'incfsz',
'rrncf',
'rlncf',
'infsnz',
'dcfsnz',
'movf',
'subwfb',
'subwfb',
'subwf'
][mnemonicSel]
instr['op'] = 'TODO'
elif instrbytes[0] >= 0x60 and instrbytes[0] < 0x70:
mnemonicSel = instrbytes[0] >> 1
instr['mnemonic'] = [
'cpfslt',
'cpfseq',
'cpfsgt',
'tstfsz',
'setf',
'clrf',
'negf',
'movwf'
][mnemonicSel]
instr['op'] = 'TODO'
elif instrbytes[0] >= 0x70 and instrbytes[0] < 0xc0:
mnemonicSel = instrbytes[0] >> 4
instr['mnemonic'] = [
'BAD', 'BAD', 'BAD', 'BAD', 'BAD', 'BAD', 'BAD',
'BTG',
'BSF',
'BCF',
'BTFSS',
'BTFSC'
][mnemonicSel]
instr['op'] = 'TODO'
elif instrbytes[0] >= 0xc0 and instrbytes[0] < 0xd0:
instr['mnemonic'] = 'MOVFF'
instr['op'] = 'TODO'
elif instrbytes[0] >= 0xd0 and instrbytes[0] < 0xd8:
instr['mnemonic'] = 'BRA'
instr['op'] = 'TODO'
elif instrbytes[0] >= 0xd8 and instrbytes[0] < 0xe0:
instr['mnemonic'] = 'RCALL'
instr['op'] = 'TODO'
elif instrbytes[0] >= 0xf0 and instrbytes[0] <= 0xff:
instr['mnemonic'] = 'MOVFF'
instr['op'] = 'TODO'
elif instrbytes[0] == 0xec or instrbytes[0] == 0xed:
instr['mnemonic'] = 'CALL'
instr['op'] = 'TODO'
instr['length'] = 2
elif instrbytes[0] == 0xee:
instr['mnemonic'] = 'LFSR'
instr['op'] = 'TODO'
instr['length'] = 2
elif instrbytes[0] == 0xef:
instr['mnemonic'] = 'GOTO'
instr['op'] = 'TODO'
instr['length'] = 2
else:
instr['mnemonic'] = 'TODO'
return (offset + instr['length'] * 2, instr)
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