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

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

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'

    # generate code block objects
    ea_cblk = CodeBlock(ea_code)
    memacc_cblk = CodeBlock(memacc_code)
    postacc_cblk = CodeBlock(postacc_code)

    # 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 EAComp object
    ea_iop = InstObjParams(name, Name, base_class, ea_cblk, inst_flags)

    # generate InstObjParams for MemAcc object
    memacc_iop = InstObjParams(name, Name, base_class, memacc_cblk, inst_flags)
    # in the split execution model, the MemAcc portion is responsible
    # for the post-access code.
    memacc_iop.postacc_code = postacc_cblk.code

    # generate InstObjParams for InitiateAcc, CompleteAcc object
    # The code used depends on the template being used
    if (exec_template_base == 'Load'):
        initiateacc_cblk = CodeBlock(ea_code + memacc_code)
        completeacc_cblk = CodeBlock(memacc_code + postacc_code)
    elif (exec_template_base == 'Store'):
        initiateacc_cblk = CodeBlock(ea_code + memacc_code)
        completeacc_cblk = CodeBlock(postacc_code)
    else:
        initiateacc_cblk = ''
        completeacc_cblk = ''

    initiateacc_iop = InstObjParams(name, Name, base_class, initiateacc_cblk,
                                    inst_flags)

    completeacc_iop = InstObjParams(name, Name, base_class, completeacc_cblk,
                                    inst_flags)

    if (exec_template_base == 'Load'):
        initiateacc_iop.ea_code = ea_cblk.code
        initiateacc_iop.memacc_code = memacc_cblk.code
        completeacc_iop.memacc_code = memacc_cblk.code
        completeacc_iop.postacc_code = postacc_cblk.code
    elif (exec_template_base == 'Store'):
        initiateacc_iop.ea_code = ea_cblk.code
        initiateacc_iop.memacc_code = memacc_cblk.code
        completeacc_iop.postacc_code = postacc_cblk.code

    # generate InstObjParams for unified execution
    cblk = CodeBlock(ea_code + memacc_code + postacc_code)
    iop = InstObjParams(name, Name, base_class, cblk, inst_flags)

    iop.ea_constructor = ea_cblk.constructor
    iop.ea_code = ea_cblk.code
    iop.memacc_constructor = memacc_cblk.constructor
    iop.memacc_code = memacc_cblk.code
    iop.postacc_code = postacc_cblk.code

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

    # select templates
    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), LoadStoreConstructor.subst(iop),
            decode_template.subst(iop),
            EACompExecute.subst(ea_iop)
            + memAccExecTemplate.subst(memacc_iop)
            + fullExecTemplate.subst(iop)
            + initiateAccTemplate.subst(initiateacc_iop)
            + completeAccTemplate.subst(completeacc_iop))
}};


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


}};