diff options
Diffstat (limited to 'src/protected_mode')
| -rw-r--r-- | src/protected_mode/mod.rs | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/src/protected_mode/mod.rs b/src/protected_mode/mod.rs index 89c5dfd..eeb2942 100644 --- a/src/protected_mode/mod.rs +++ b/src/protected_mode/mod.rs @@ -7087,12 +7087,6 @@ fn read_operands< OperandCase::ModRM_0x0f0d => { let r = instruction.regs[0].num & 0b111; - let bank = if instruction.prefixes.operand_size() { - RegisterBank::W - } else { - RegisterBank::D - }; - match r { 1 => { instruction.opcode = Opcode::PREFETCHW; @@ -7101,12 +7095,14 @@ fn read_operands< instruction.opcode = Opcode::NOP; } } - instruction.operands[0] = mem_oper; - if instruction.operands[0] != OperandSpec::RegMMM { - instruction.mem_size = 64; - } else { - instruction.regs[1].bank = bank; + if mem_oper == OperandSpec::RegMMM { + // *found* this from running `0f0dc0` under KVM on a Zen 5 system. this is + // consistent with the register number being used to pick kinds of prefetch. + return Err(DecodeError::InvalidOperand); } + + instruction.operands[0] = mem_oper; + instruction.mem_size = 64; instruction.operand_count = 1; } OperandCase::ModRM_0x0f0f => { |