xref: /gem5/src/arch/arm/isa/insts/ldr.isa

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

// Copyright (c) 2010 ARM Limited
// All rights reserved
//
// The license below extends only to copyright in the software and shall
// not be construed as granting a license to any other intellectual
// property including but not limited to intellectual property relating
// to a hardware implementation of the functionality of the software
// licensed hereunder.  You may use the software subject to the license
// terms below provided that you ensure that this notice is replicated
// unmodified and in its entirety in all distributions of the software,
// modified or unmodified, in source code or in binary form.
//
// 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: Gabe Black

let {{

    header_output = ""
    decoder_output = ""
    exec_output = ""

    def loadImmClassName(post, add, writeback, \
                         size=4, sign=False, user=False):
        return memClassName("LOAD_IMM", post, add, writeback,
                            size, sign, user)

    def loadRegClassName(post, add, writeback, \
                         size=4, sign=False, user=False):
        return memClassName("LOAD_REG", post, add, writeback,
                            size, sign, user)

    def emitLoad(name, Name, imm, eaCode, accCode, memFlags, instFlags, base):
        global header_output, decoder_output, exec_output

        (newHeader,
         newDecoder,
         newExec) = newLoadStoreBase(name, Name, imm,
                                     eaCode, accCode,
                                     memFlags, instFlags,
                                     base, execTemplateBase = 'Load')

        header_output += newHeader
        decoder_output += newDecoder
        exec_output += newExec

    def buildImmLoad(mnem, post, add, writeback, \
                     size=4, sign=False, user=False):
        name = mnem
        Name = loadImmClassName(post, add, writeback, \
                                size, sign, user)

        if add:
            op = " +"
        else:
            op = " -"

        offset = op + " imm"
        eaCode = "EA = Base"
        if not post:
            eaCode += offset
        eaCode += ";"

        accCode = "Dest = Mem%s;\n" % buildMemSuffix(sign, size)
        if writeback:
            accCode += "Base = Base %s;\n" % offset
        base = buildMemBase("MemoryNewImm", post, writeback)

        emitLoad(name, Name, True, eaCode, accCode, [], [], base)

    def buildRegLoad(mnem, post, add, writeback, \
                     size=4, sign=False, user=False):
        name = mnem
        Name = loadRegClassName(post, add, writeback,
                                size, sign, user)

        if add:
            op = " +"
        else:
            op = " -"

        offset = op + " shift_rm_imm(Index, shiftAmt," + \
                      " shiftType, CondCodes<29:>)"
        eaCode = "EA = Base"
        if not post:
            eaCode += offset
        eaCode += ";"

        accCode = "Dest = Mem%s;\n" % buildMemSuffix(sign, size)
        if writeback:
            accCode += "Base = Base %s;\n" % offset
        base = buildMemBase("MemoryNewReg", post, writeback)

        emitLoad(name, Name, False, eaCode, accCode, [], [], base)

    def buildLoads(mnem, size=4, sign=False, user=False):
        buildImmLoad(mnem, True, True, True, size, sign, user)
        buildRegLoad(mnem, True, True, True, size, sign, user)
        buildImmLoad(mnem, True, False, True, size, sign, user)
        buildRegLoad(mnem, True, False, True, size, sign, user)
        buildImmLoad(mnem, False, True, True, size, sign, user)
        buildRegLoad(mnem, False, True, True, size, sign, user)
        buildImmLoad(mnem, False, False, True, size, sign, user)
        buildRegLoad(mnem, False, False, True, size, sign, user)
        buildImmLoad(mnem, False, True, False, size, sign, user)
        buildRegLoad(mnem, False, True, False, size, sign, user)
        buildImmLoad(mnem, False, False, False, size, sign, user)
        buildRegLoad(mnem, False, False, False, size, sign, user)

    buildLoads("ldr")
    buildLoads("ldrt", user=True)
    buildLoads("ldrb", size=1)
    buildLoads("ldrbt", size=1, user=True)
    buildLoads("ldrsb", size=1, sign=True)
    buildLoads("ldrsbt", size=1, sign=True, user=True)
    buildLoads("ldrh", size=2)
    buildLoads("ldrht", size=2, user=True)
    buildLoads("hdrsh", size=2, sign=True)
    buildLoads("ldrsht", size=2, sign=True, user=True)
}};