diff options
Diffstat (limited to 'src/armv7.rs')
| -rw-r--r-- | src/armv7.rs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/armv7.rs b/src/armv7.rs index ada486a..2901508 100644 --- a/src/armv7.rs +++ b/src/armv7.rs @@ -1492,6 +1492,17 @@ impl Decoder<ARMv7> for InstDecoder { } } 0b11 => { + // We know the instruction looks like this... + // |1 1 1 1|1 1 1|x x x x|x|x x x x|x x x x|x x x x x|x x|x|x x x x| + // ^ We need to check that this bit is zero, if any of the + // instructions decoded in this block are to match + // correctly. + // See A5-214 for the table that shows the required forms for these + // instructions. + if (op1 >> 4) & 1 != 0 { + return Err(DecodeError::InvalidOpcode); + } + // operands are shared between cdp2 and mcr2/mrc2, but Rt is repurposed as // CRd let CRm = word as u8 & 0b1111; |