diff options
Diffstat (limited to 'atk16_asm/asm_ops.py')
| -rw-r--r-- | atk16_asm/asm_ops.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/atk16_asm/asm_ops.py b/atk16_asm/asm_ops.py index a7ef88f..3198d4c 100644 --- a/atk16_asm/asm_ops.py +++ b/atk16_asm/asm_ops.py @@ -126,6 +126,10 @@ def make_jpi(meta: Meta, symbols: Symbols, imm: int | str) -> int: """JPI 0110 XXXI IIII IIII""" imm_e = eval_expr(symbols, str(imm), bits=9) imm_e = imm_e - meta.address - 1 + + if imm_e < -(2 ** 8) or imm_e >= 2 ** 8: + raise Exception(f"jpi imm value is not representable in 9 bits: {imm_e}") + imm_e = imm_e & (0b111111111) word = (0b0110 << 12) + \ imm_e |