gem5/src/arch/arm/isa/insts/data.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
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// 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
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Authors: Gabe Black

let {{

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

    calcQCode = '''
        cprintf("canOverflow: %%d\\n", Dest < resTemp);
        replaceBits(CondCodes, 27, Dest < resTemp);
    '''

    calcCcCode = '''
        uint16_t _ic, _iv, _iz, _in;
        _in = (resTemp >> %(negBit)d) & 1;
        _iz = (resTemp == 0);
        _iv = %(ivValue)s & 1;
        _ic = %(icValue)s & 1;

        CondCodes =  _in << 31 | _iz << 30 | _ic << 29 | _iv << 28 |
                    (CondCodes & 0x0FFFFFFF);

        DPRINTF(Arm, "(in, iz, ic, iv) = (%%d, %%d, %%d, %%d)\\n",
                     _in, _iz, _ic, _iv);
       '''

    # Dict of code to set the carry flag. (imm, reg, reg-reg)
    oldC = 'CondCodes<29:>'
    oldV = 'CondCodes<28:>'
    carryCode = {
        "none": (oldC, oldC, oldC),
        "llbit": (oldC, oldC, oldC),
        "overflow": ('0', '0', '0'),
        "add": ('findCarry(32, resTemp, Op1, secondOp)',
                'findCarry(32, resTemp, Op1, secondOp)',
                'findCarry(32, resTemp, Op1, secondOp)'),
        "sub": ('findCarry(32, resTemp, Op1, ~secondOp)',
                'findCarry(32, resTemp, Op1, ~secondOp)',
                'findCarry(32, resTemp, Op1, ~secondOp)'),
        "rsb": ('findCarry(32, resTemp, secondOp, ~Op1)',
                'findCarry(32, resTemp, secondOp, ~Op1)',
                'findCarry(32, resTemp, secondOp, ~Op1)'),
        "logic": ('(rotC ? bits(secondOp, 31) : %s)' % oldC,
                  'shift_carry_imm(Op2, shiftAmt, shiftType, %s)' % oldC,
                  'shift_carry_rs(Op2, Shift<7:0>, shiftType, %s)' % oldC)
    }
    # Dict of code to set the overflow flag.
    overflowCode = {
        "none": oldV,
        "llbit": oldV,
        "overflow": '0',
        "add": 'findOverflow(32, resTemp, Op1, secondOp)',
        "sub": 'findOverflow(32, resTemp, Op1, ~secondOp)',
        "rsb": 'findOverflow(32, resTemp, secondOp, ~Op1)',
        "logic": oldV
    }

    secondOpRe = re.compile("secondOp")
    immOp2 = "imm"
    regOp2 = "shift_rm_imm(Op2, shiftAmt, shiftType, CondCodes<29:>)"
    regRegOp2 = "shift_rm_rs(Op2, Shift, shiftType, CondCodes<29:>)"

    def buildDataInst(mnem, code, flagType = "logic"):
        global header_output, decoder_output, exec_output
        cCode = carryCode[flagType]
        vCode = overflowCode[flagType]
        negBit = 31
        if flagType == "llbit":
            negBit = 63
        if flagType == "overflow":
            immCcCode = regCcCode = regRegCcCode = calcQCode
        else:
            immCcCode = calcCcCode % {
                "icValue": secondOpRe.sub(immOp2, cCode[0]),
                "ivValue": secondOpRe.sub(immOp2, vCode),
                "negBit": negBit
            }
            regCcCode = calcCcCode % {
                "icValue": secondOpRe.sub(regOp2, cCode[1]),
                "ivValue": secondOpRe.sub(regOp2, vCode),
                "negBit": negBit
            }
            regRegCcCode = calcCcCode % {
                "icValue": secondOpRe.sub(regRegOp2, cCode[2]),
                "ivValue": secondOpRe.sub(regRegOp2, vCode),
                "negBit": negBit
            }
        immCode = secondOpRe.sub(immOp2, code)
        regCode = secondOpRe.sub(regOp2, code)
        regRegCode = secondOpRe.sub(regRegOp2, code)
        immIop = InstObjParams(mnem, mnem.capitalize() + "Imm", "DataImmOp",
                               {"code" : immCode,
                                "predicate_test": predicateTest})
        regIop = InstObjParams(mnem, mnem.capitalize() + "Reg", "DataRegOp",
                               {"code" : regCode,
                                "predicate_test": predicateTest})
        regRegIop = InstObjParams(mnem, mnem.capitalize() + "RegReg",
                                  "DataRegRegOp",
                                  {"code" : regRegCode,
                                   "predicate_test": predicateTest})
        immIopCc = InstObjParams(mnem + "s", mnem.capitalize() + "ImmCc",
                                 "DataImmOp",
                                 {"code" : immCode + immCcCode,
                                  "predicate_test": predicateTest})
        regIopCc = InstObjParams(mnem + "s", mnem.capitalize() + "RegCc",
                                 "DataRegOp",
                                 {"code" : regCode + regCcCode,
                                  "predicate_test": predicateTest})
        regRegIopCc = InstObjParams(mnem + "s",
                                    mnem.capitalize() + "RegRegCc",
                                    "DataRegRegOp",
                                    {"code" : regRegCode + regRegCcCode,
                                     "predicate_test": predicateTest})
        header_output += DataImmDeclare.subst(immIop) + \
                         DataImmDeclare.subst(immIopCc) + \
                         DataRegDeclare.subst(regIop) + \
                         DataRegDeclare.subst(regIopCc) + \
                         DataRegRegDeclare.subst(regRegIop) + \
                         DataRegRegDeclare.subst(regRegIopCc)
        decoder_output += DataImmConstructor.subst(immIop) + \
                          DataImmConstructor.subst(immIopCc) + \
                          DataRegConstructor.subst(regIop) + \
                          DataRegConstructor.subst(regIopCc) + \
                          DataRegRegConstructor.subst(regRegIop) + \
                          DataRegRegConstructor.subst(regRegIopCc)
        exec_output += PredOpExecute.subst(immIop) + \
                       PredOpExecute.subst(immIopCc) + \
                       PredOpExecute.subst(regIop) + \
                       PredOpExecute.subst(regIopCc) + \
                       PredOpExecute.subst(regRegIop) + \
                       PredOpExecute.subst(regRegIopCc)

    buildDataInst("and", "Dest = resTemp = Op1 & secondOp;")
    buildDataInst("eor", "Dest = resTemp = Op1 ^ secondOp;")
    buildDataInst("sub", "Dest = resTemp = Op1 - secondOp;", "sub")
    buildDataInst("rsb", "Dest = resTemp = secondOp - Op1;", "rsb")
    buildDataInst("add", "Dest = resTemp = Op1 + secondOp;", "add")
    buildDataInst("adc", "Dest = resTemp = Op1 + secondOp + %s;" % oldC, "add")
    buildDataInst("sbc", "Dest = resTemp = Op1 - secondOp - !%s;" % oldC, "sub")
    buildDataInst("rsc", "Dest = resTemp = secondOp - Op1 - !%s;" % oldC, "rsb")
    buildDataInst("tst", "resTemp = Op1 & secondOp;")
    buildDataInst("teq", "resTemp = Op1 ^ secondOp;")
    buildDataInst("cmp", "resTemp = Op1 - secondOp;", "sub")
    buildDataInst("cmn", "resTemp = Op1 + secondOp;", "add")
    buildDataInst("orr", "Dest = resTemp = Op1 | secondOp;")
    buildDataInst("orn", "Dest = resTemp = Op1 | ~secondOp;")
    buildDataInst("mov", "Dest = resTemp = secondOp;")
    buildDataInst("bic", "Dest = resTemp = Op1 & ~secondOp;")
    buildDataInst("mvn", "Dest = resTemp = ~secondOp;")
}};