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#!/usr/bin/env python3
import sys
if len(sys.argv) != 2:
print(f"Usage: {sys.argv[0]} [filename]")
sys.exit(1)
def decode_jump(ins: int) -> str:
if (ins & 0x7) == 0:
return ""
if (ins & 0x7) == 0x7:
return "; j"
jl = (ins & (1<<2)) != 0
je = (ins & (1<<1)) != 0
jg = (ins & (1<<0)) != 0
# implied: and not jg
if (jl and je): return "; jle"
# implied: and not je
if (jl and jg): return "; jne"
# implied: and not je
if (je and jg): return "; jge"
# implied: only one flag is 1
if (jl): return "; jl"
if (je): return "; je"
if (jg): return "; jg"
return "; <unknown>"
def decode_ins(ins: int) -> str:
opcode = (ins >> 8) & 0x03
ar_n_log = (ins & (1<<10)) != 0
opcode |= (ar_n_log << 2)
if opcode == 0b000: return "AND"
if opcode == 0b001: return "OR"
if opcode == 0b010: return "XOR"
if opcode == 0b011: return "NEG"
if opcode == 0b100: return "ADD"
if opcode == 0b101: return "INC"
if opcode == 0b110: return "SUB"
if opcode == 0b111: return "DEC"
return "<?>"
def decode(ins: int) -> str:
if (ins & 0x8000 == 0):
# mov? ldr? ldi? aaaaaaaaaaa....
return f"mov A, #{ins}"
else:
use_mem = (ins & (1<<12)) != 0
zx = (ins & (1<<7)) != 0
sw = (ins & (1<<6)) != 0
dA = (ins & (1<<5)) != 0
dD = (ins & (1<<4)) != 0
dM = (ins & (1<<3)) != 0
codename = decode_ins(ins)
return f"{codename:<5}<unknown>{decode_jump(ins)}"
try:
with open(sys.argv[1], "rb") as f:
while True:
insb = f.read(2)
if not insb: break
ins = int.from_bytes(insb)
print(f"\t{insb[0]:02x} {insb[1]:02x}\t{decode(ins)}")
except FileNotFoundError:
print(f"File not found.")
sys.exit(1)
# head, tail...
except BrokenPipeError:
sys.exit(0)
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