xref: /gem5/src/arch/x86/isa/decoder/locked_opcodes.isa

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// Authors: Gabe Black

////////////////////////////////////////////////////////////////////
//
// Decode opcodes with the lock prefix. Opcodes which shouldn't have that
// prefix should effectively decode to UD2.
//

// All the memory references in these instructions happen through modrm bytes.
// We therefore only need to make sure the modrm byte encodes a memory
// reference to make sure these are the memory forms of these instructions.
0x1: decode MODRM_MOD {
    format Inst {
        0x3: UD2();
        default: decode OPCODE_NUM {
            0x1: decode OPCODE_OP_TOP5 {
                0x00: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::ADD_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x01: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::OR_LOCKED(OPCODE_OP_BOTTOM3,
                                           [Mb,Gb], [Mv,Gv]);
                }
                0x02: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::ADC_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x03: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::SBB_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x04: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::AND_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x05: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::SUB_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x06: decode OPCODE_OP_BOTTOM3 {
                    default: MultiInst::XOR_LOCKED(OPCODE_OP_BOTTOM3,
                                            [Mb,Gb], [Mv,Gv]);
                }
                0x10: decode OPCODE_OP_BOTTOM3 {
                    0x0: decode MODRM_REG {
                        0x0: ADD_LOCKED(Mb,Ib);
                        0x1: OR_LOCKED(Mb,Ib);
                        0x2: ADC_LOCKED(Mb,Ib);
                        0x3: SBB_LOCKED(Mb,Ib);
                        0x4: AND_LOCKED(Mb,Ib);
                        0x5: SUB_LOCKED(Mb,Ib);
                        0x6: XOR_LOCKED(Mb,Ib);
                    }
                    0x1: decode MODRM_REG {
                        0x0: ADD_LOCKED(Mv,Iz);
                        0x1: OR_LOCKED(Mv,Iz);
                        0x2: ADC_LOCKED(Mv,Iz);
                        0x3: SBB_LOCKED(Mv,Iz);
                        0x4: AND_LOCKED(Mv,Iz);
                        0x5: SUB_LOCKED(Mv,Iz);
                        0x6: XOR_LOCKED(Mv,Iz);
                    }
                    0x2: decode MODE_SUBMODE {
                        0x0: UD2();
                        default: decode MODRM_REG {
                            0x0: ADD_LOCKED(Mb,Ib);
                            0x1: OR_LOCKED(Mb,Ib);
                            0x2: ADC_LOCKED(Mb,Ib);
                            0x3: SBB_LOCKED(Mb,Ib);
                            0x4: AND_LOCKED(Mb,Ib);
                            0x5: SUB_LOCKED(Mb,Ib);
                            0x6: XOR_LOCKED(Mb,Ib);
                        }
                    }
                    //0x3: group1_Ev_Ib();
                    0x3: decode MODRM_REG {
                        0x0: ADD_LOCKED(Mv,Ib);
                        0x1: OR_LOCKED(Mv,Ib);
                        0x2: ADC_LOCKED(Mv,Ib);
                        0x3: SBB_LOCKED(Mv,Ib);
                        0x4: AND_LOCKED(Mv,Ib);
                        0x5: SUB_LOCKED(Mv,Ib);
                        0x6: XOR_LOCKED(Mv,Ib);
                    }
                    0x6: XCHG_LOCKED(Mb,Gb);
                    0x7: XCHG_LOCKED(Mv,Gv);
                }
                0x1E: decode OPCODE_OP_BOTTOM3 {
                    //0x6: group3_Eb();
                    0x6: decode MODRM_REG {
                        0x2: NOT_LOCKED(Mb);
                        0x3: NEG_LOCKED(Mb);
                    }
                    //0x7: group3_Ev();
                    0x7: decode MODRM_REG {
                        0x2: NOT_LOCKED(Mv);
                        0x3: NEG_LOCKED(Mv);
                    }
                }
                0x1F: decode OPCODE_OP_BOTTOM3 {
                    0x6: decode MODRM_REG {
                        0x0: INC_LOCKED(Mb);
                        0x1: DEC_LOCKED(Mb);
                        default: UD2();
                    }
                    //0x7: group5();
                    0x7: decode MODRM_REG {
                        0x0: INC_LOCKED(Mv);
                        0x1: DEC_LOCKED(Mv);
                    }
                }
            }
            0x2: decode OPCODE_PREFIXA {
                0x0F: decode OPCODE_OP_TOP5 {
                    0x15: decode OPCODE_OP_BOTTOM3 {
                        0x3: BTS_LOCKED(Mv,Gv);
                    }
                    0x16: decode OPCODE_OP_BOTTOM3 {
                        0x0: CMPXCHG_LOCKED(Mb,Gb);
                        0x1: CMPXCHG_LOCKED(Mv,Gv);
                        0x3: BTR_LOCKED(Mv,Gv);
                    }
                    0x17: decode OPCODE_OP_BOTTOM3 {
                        0x2: decode MODRM_REG {
                            0x5: BTS_LOCKED(Mv,Ib);
                            0x6: BTR_LOCKED(Mv,Ib);
                            0x7: BTC_LOCKED(Mv,Ib);
                        }
                        0x3: BTC_LOCKED(Mv,Gv);
                    }
                    0x18: decode OPCODE_OP_BOTTOM3 {
                        0x0: XADD_LOCKED(Mb,Gb);
                        0x1: XADD_LOCKED(Mv,Gv);
                        //0x7: group9();
                        0x7: decode MODRM_REG {
                            0x1: WarnUnimpl::cmpxchg_Mq_LOCKED();
                        }
                    }
                }
                default: M5InternalError::error(
                    {{"Unexpected first opcode byte in two byte opcode!"}});
            }
        }
    }
}