diff options
| author | uvok | 2026-01-09 16:27:09 +0100 |
|---|---|---|
| committer | uvok | 2026-01-09 16:27:09 +0100 |
| commit | cdb2a203f3fe71636e42f357e5e073ef4b2306c8 (patch) | |
| tree | 0d18b04b9b4bc0a4e442a0d1d0f3a304d37d583d /nandgame/assembler/disas.py | |
| parent | b65ed96c66b9ad2243bda0367274b42b963e9321 (diff) | |
bit 14 unset (w/ 15 set) = illegal ins
Diffstat (limited to 'nandgame/assembler/disas.py')
| -rwxr-xr-x | nandgame/assembler/disas.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/nandgame/assembler/disas.py b/nandgame/assembler/disas.py index 56b44c4..5d8ccf5 100755 --- a/nandgame/assembler/disas.py +++ b/nandgame/assembler/disas.py @@ -183,6 +183,10 @@ def fixup_ins(ins: int) -> list[str]: def print_decoded(ins: int, simplify: bool) -> str: + # illegal instruction + if ins & 0xC000 == 0x8000: + return "halt" + if simplify: (mnemonic, dest, op1, op2, jumpdest) = fixup_ins(ins) else: |