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

// Copyright (c) 2007 The Hewlett-Packard Development Company
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// Authors: Gabe Black

////////////////////////////////////////////////////////////////////
//
// The actual decoder specification
//

decode OPCODE_NUM default Unknown::unknown()
{
    0x0: M5InternalError::error(
        {{"Saw an ExtMachInst with zero opcode bytes!"}});
    //1 byte opcodes
    ##include "one_byte_opcodes.isa"
    //2 byte opcodes
    ##include "two_byte_opcodes.isa"
    //3 byte opcodes
    0x3: decode OPCODE_PREFIXA {
        0xF0: decode OPCODE_PREFIXB {
            //We don't handle these properly in the predecoder yet, so there's
            //no reason to implement them for now.
            0x38: decode OPCODE_OP {
                default: FailUnimpl::sseThreeEight();
            }
            0x3A: decode OPCODE_OP {
                default: FailUnimpl::sseThreeA();
            }
            0xF0: decode OPCODE_OP {
                default: FailUnimpl::threednow();
            }
            default: M5InternalError::error(
                {{"Unexpected second opcode byte in three byte opcode!"}});
        }
        default: M5InternalError::error(
            {{"Unexpected first opcode byte in three byte opcode!"}});
    }
}