diff options
Diffstat (limited to 'src/real_mode/mod.rs')
| -rw-r--r-- | src/real_mode/mod.rs | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/real_mode/mod.rs b/src/real_mode/mod.rs index 8376230..bfcb79f 100644 --- a/src/real_mode/mod.rs +++ b/src/real_mode/mod.rs @@ -4422,6 +4422,47 @@ impl Instruction { instr: self, } } + + /// does this instruction include the `xacquire` hint for hardware lock elision? + pub fn xacquire(&self) -> bool { + if self.prefixes.repnz() { + // xacquire is permitted on typical `lock` instructions, OR `xchg` with memory operand, + // regardless of `lock` prefix. + if self.prefixes.lock() { + true + } else if self.opcode == Opcode::XCHG { + self.operands[0] != OperandSpec::RegMMM && self.operands[1] != OperandSpec::RegMMM + } else { + false + } + } else { + false + } + } + + /// does this instruction include the `xrelease` hint for hardware lock elision? + pub fn xrelease(&self) -> bool { + if self.prefixes.rep() { + // xrelease is permitted on typical `lock` instructions, OR `xchg` with memory operand, + // regardless of `lock` prefix. additionally, xrelease is permitted on some forms of mov. + if self.prefixes.lock() { + true + } else if self.opcode == Opcode::XCHG { + self.operands[0] != OperandSpec::RegMMM && self.operands[1] != OperandSpec::RegMMM + } else if self.opcode == Opcode::MOV { + self.operands[0] != OperandSpec::RegMMM && ( + self.operands[1] == OperandSpec::RegRRR || + self.operands[1] == OperandSpec::ImmI8 || + self.operands[1] == OperandSpec::ImmI16 || + self.operands[1] == OperandSpec::ImmI32 + ) + } else { + false + } + } else { + false + } + } } #[derive(Debug, Copy, Clone, Eq, PartialEq)] |