xref: /gem5/src/arch/x86/isa/formats/string.isa

// -*- mode:c++ -*-

// Copyright (c) 2007 The Hewlett-Packard Development Company
// All rights reserved.
//
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// to a hardware implementation of the functionality of the software
// licensed hereunder.  You may use the software subject to the license
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//
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// modification, are permitted provided that the following conditions are
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// notice, this list of conditions and the following disclaimer;
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// this software without specific prior written permission.
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Authors: Gabe Black

//////////////////////////////////////////////////////////////////////////
//
// String Instructions
//
//////////////////////////////////////////////////////////////////////////

def format StringTestInst(*opTypeSet) {{
    allBlocks = OutputBlocks()

    regBlocks = specializeInst(Name, list(opTypeSet), EmulEnv())
    eBlocks = specializeInst(Name + "_E", list(opTypeSet), EmulEnv())
    nBlocks = specializeInst(Name + "_N", list(opTypeSet), EmulEnv())

    for blocks in (regBlocks, eBlocks, nBlocks):
        allBlocks.header_output += blocks.header_output
        allBlocks.decoder_output += blocks.decoder_output
        allBlocks.exec_output += blocks.exec_output

    allBlocks.decode_block = '''
        if (LEGACY_REP) {
            %s
        } else if (LEGACY_REPNE) {
            %s
        } else {
            %s
        }
    ''' % (eBlocks.decode_block, nBlocks.decode_block, regBlocks.decode_block)

    (header_output, decoder_output,
     decode_block, exec_output) = allBlocks.makeList()
}};

def format StringInst(*opTypeSet) {{
    allBlocks = OutputBlocks()

    regBlocks = specializeInst(Name, list(opTypeSet), EmulEnv())
    eBlocks = specializeInst(Name + "_E", list(opTypeSet), EmulEnv())

    for blocks in (regBlocks, eBlocks):
        allBlocks.header_output += blocks.header_output
        allBlocks.decoder_output += blocks.decoder_output
        allBlocks.exec_output += blocks.exec_output

    allBlocks.decode_block = '''
        if (LEGACY_REP) {
            %s
        } else if (LEGACY_REPNE) {
            // The repne prefix is illegal
            return new MicroFault(machInst, "illprefix", 0,
                                  std::make_shared<InvalidOpcode>(), 0);
        } else {
            %s
        }
    ''' % (eBlocks.decode_block, regBlocks.decode_block)

    (header_output, decoder_output,
     decode_block, exec_output) = allBlocks.makeList()
}};