144 lines
4.9 KiB
Python
Executable File
144 lines
4.9 KiB
Python
Executable File
#!/usr/bin/env python3
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import struct
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OP = [
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# Mnemonic, mask, value, xmask, ymask, kmask, klabel
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('CLS', '',
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0xffff, 0x00e0, 0x0000, 0x0000, 0x0000, False),
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('RET', '',
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0xffff, 0x00ee, 0x0000, 0x0000, 0x0000, False),
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('SYS', '{k}',
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0xf000, 0x0000, 0x0000, 0x0000, 0x0fff, True),
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('JP', '{k}',
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0xf000, 0x1000, 0x0000, 0x0000, 0x0fff, True),
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('CALL', '{k}',
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0xf000, 0x2000, 0x0000, 0x0000, 0x0fff, True),
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('SE', 'V{x:01x}, {k:02x}',
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0xf000, 0x3000, 0x0f00, 0x0000, 0x00ff, False),
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('SNE', 'V{x:01x}, {k:02x}',
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0xf000, 0x4000, 0x0f00, 0x0000, 0x00ff, False),
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('SE', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x5000, 0x0f00, 0x00f0, 0x0000, False),
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('LD', 'V{x:01x}, {k:02x}',
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0xf000, 0x6000, 0x0f00, 0x0000, 0x00ff, False),
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('ADD', 'V{x:01x}, {k:02x}',
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0xf000, 0x7000, 0x0f00, 0x0000, 0x00ff, False),
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('LD', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8000, 0x0f00, 0x00f0, 0x0000, False),
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('OR', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8001, 0x0f00, 0x00f0, 0x0000, False),
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('AND', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8002, 0x0f00, 0x00f0, 0x0000, False),
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('XOR', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8003, 0x0f00, 0x00f0, 0x0000, False),
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('ADD', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8004, 0x0f00, 0x00f0, 0x0000, False),
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('SUB', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8005, 0x0f00, 0x00f0, 0x0000, False),
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('SHR', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x8006, 0x0f00, 0x00f0, 0x0000, False),
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('SHL', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x800e, 0x0f00, 0x00f0, 0x0000, False),
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('SNE', 'V{x:01x}, V{y:01x}',
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0xf00f, 0x9000, 0x0f00, 0x00f0, 0x0000, False),
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('LD', 'I, {k}',
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0xf000, 0xa000, 0x0000, 0x0000, 0x0fff, True),
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('JP', 'V0, {k}',
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0xf000, 0xb000, 0x0000, 0x0000, 0x0fff, True),
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('RND', 'V{x:01x}, {k:02x}',
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0xf000, 0xc000, 0x0f00, 0x0000, 0x00ff, False),
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('DRW', 'V{x:01x}, V{y:01x}, {k:02x}',
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0xf000, 0xd000, 0x0f00, 0x00f0, 0x000f, False),
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('SKP', 'V{x:01x}',
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0xf0ff, 0xe09e, 0x0f00, 0x0000, 0x0000, False),
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('SKNP', 'V{x:01x}',
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0xf0ff, 0xe0a1, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'V{x:01x}, DT',
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0xf0ff, 0xf007, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'V{x:01x}, K',
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0xf0ff, 0xf00a, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'DT, V{x:01x}',
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0xf0ff, 0xf015, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'ST, V{x:01x}',
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0xf0ff, 0xf018, 0x0f00, 0x0000, 0x0000, False),
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('ADD', 'I, V{x:01x}',
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0xf0ff, 0xf01e, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'F, V{x:01x}',
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0xf0ff, 0xf029, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'B, V{x:01x}',
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0xf0ff, 0xf033, 0x0f00, 0x0000, 0x0000, False),
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('LD', '[I], V{x:01x}',
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0xf0ff, 0xf055, 0x0f00, 0x0000, 0x0000, False),
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('LD', 'V{x:01x}, [I]',
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0xf0ff, 0xf065, 0x0f00, 0x0000, 0x0000, False),
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('DATA', '{k:04x}',
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0x0000, 0x0000, 0x0000, 0x0000, 0xffff, False)
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]
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def c8decode(ins):
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def _unmask(v, m):
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if m == 0:
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return None
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r = v & m
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while (m & 1) == 0:
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m >>= 1
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r >>= 1
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return r
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for mn, fmt, mask, value, xmask, ymask, kmask, klabel in OP:
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if (ins & mask) == value:
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xo = _unmask(ins, xmask)
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yo = _unmask(ins, ymask)
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ko = _unmask(ins, kmask)
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return (mn, fmt, xo, yo, ko, klabel)
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def disasm(filename, org=0x200):
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pc = org
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targets = set()
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listing = []
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with open(filename, 'rb') as f:
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while True:
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w = f.read(2)
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if len(w) != 2:
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break
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instr = struct.unpack('>H', w)[0]
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mn, fmt, xo, yo, ko, klabel = c8decode(instr)
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if klabel:
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targets.add(ko)
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listing.append((pc, instr, mn, fmt, xo, yo, ko, klabel))
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pc += 2
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end = pc
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print(f""";
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; {filename}
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; start={org:03x} end={end:03x} size={end-org}(dec)
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;
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""")
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for pc, instr, mn, fmt, xo, yo, ko, klabel in listing:
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if pc in targets:
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label = "l%03x" % (pc,)
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else:
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label = ""
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if klabel:
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if org <= ko <= end:
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ko = f"l{ko:03x}"
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else:
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ko = f"{ko:03x}"
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o = fmt.format(x=xo, y=yo, k=ko)
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print(f"{label:8s} {mn:5s} {o:12s} ; {pc:03x}: {instr:04x}")
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if __name__ == '__main__':
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import sys
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for fn in sys.argv[1:]:
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disasm(fn)
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