gem5/src/arch/mips/isa/formats/util.isa

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

// Copyright (c) 2006 The Regents of The University of Michigan
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met: redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer;
// redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution;
// neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: Steve Reinhardt
//          Korey Sewell

let {{
def LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
                  postacc_code = '', base_class = 'Memory',
                  decode_template = BasicDecode, exec_template_base = ''):
    # Make sure flags are in lists (convert to lists if not).
    mem_flags = makeList(mem_flags)
    inst_flags = makeList(inst_flags)

    # add hook to get effective addresses into execution trace output.
    ea_code += '\nif (traceData) { traceData->setAddr(EA); }\n'

    # Some CPU models execute the memory operation as an atomic unit,
    # while others want to separate them into an effective address
    # computation and a memory access operation.  As a result, we need
    # to generate three StaticInst objects.  Note that the latter two
    # are nested inside the larger "atomic" one.

    # Generate InstObjParams for each of the three objects.  Note that
    # they differ only in the set of code objects contained (which in
    # turn affects the object's overall operand list).
    iop = InstObjParams(name, Name, base_class,
                        { 'ea_code':ea_code, 'memacc_code':memacc_code, 'postacc_code':postacc_code },
                        inst_flags)
    ea_iop = InstObjParams(name, Name, base_class,
                        { 'ea_code':ea_code },
                        inst_flags)
    memacc_iop = InstObjParams(name, Name, base_class,
                        { 'memacc_code':memacc_code, 'postacc_code':postacc_code },
                        inst_flags)

    if mem_flags:
        s = '\n\tmemAccessFlags = ' + string.join(mem_flags, '|') + ';'
        iop.constructor += s
        memacc_iop.constructor += s

    # select templates

    # The InitiateAcc template is the same for StoreCond templates as the
    # corresponding Store template..
    StoreCondInitiateAcc = StoreInitiateAcc

    memAccExecTemplate = eval(exec_template_base + 'MemAccExecute')
    fullExecTemplate = eval(exec_template_base + 'Execute')
    initiateAccTemplate = eval(exec_template_base + 'InitiateAcc')
    completeAccTemplate = eval(exec_template_base + 'CompleteAcc')

    # (header_output, decoder_output, decode_block, exec_output)
    return (LoadStoreDeclare.subst(iop),
            EACompConstructor.subst(ea_iop)
            + MemAccConstructor.subst(memacc_iop)
            + LoadStoreConstructor.subst(iop),
            decode_template.subst(iop),
            EACompExecute.subst(ea_iop)
            + memAccExecTemplate.subst(memacc_iop)
            + fullExecTemplate.subst(iop)
            + initiateAccTemplate.subst(iop)
            + completeAccTemplate.subst(iop))
}};


output header {{
        std::string inst2string(MachInst machInst);
}};

output decoder {{

std::string inst2string(MachInst machInst)
{
    std::string str = "";
    uint32_t mask = 0x80000000;

    for(int i=0; i < 32; i++) {
        if ((machInst & mask) == 0) {
            str += "0";
        } else {
            str += "1";
        }

        mask = mask >> 1;
    }

    return str;
}

}};
output exec {{

    using namespace MipsISA;

    /// CLEAR ALL CPU INST/EXE HAZARDS
    inline void
    clear_exe_inst_hazards()
    {
        //CODE HERE
    }


    /// Check "FP enabled" machine status bit.  Called when executing any FP
    /// instruction in full-system mode.
    /// @retval Full-system mode: NoFault if FP is enabled, FenFault
    /// if not.  Non-full-system mode: always returns NoFault.
#if FULL_SYSTEM
    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
    {
        Fault fault = NoFault;	// dummy... this ipr access should not fault
        if (!Mips34k::ICSR_FPE(xc->readIpr(MipsISA::IPR_ICSR, fault))) {
            fault = FloatEnableFault;
        }
        return fault;
    }
#else
    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
    {
        return NoFault;
    }
#endif



}};