xref: /gem5/src/arch/x86/insts/microop.hh

/*
 * Copyright (c) 2007 The Hewlett-Packard Development Company
 * 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
 */

#ifndef __ARCH_X86_INSTS_MICROOP_HH__
#define __ARCH_X86_INSTS_MICROOP_HH__

#include "arch/x86/insts/static_inst.hh"

namespace X86ISA
{
    namespace ConditionTests
    {
        enum CondTest {
            True,
            NotFalse = True,
            ECF,
            EZF,
            SZnZF,
            MSTRZ,
            STRZ,
            MSTRC,
            STRZnEZF,
            OF,
            CF,
            ZF,
            CvZF,
            SF,
            PF,
            SxOF,
            SxOvZF,

            False,
            NotTrue = False,
            NotECF,
            NotEZF,
            NotSZnZF,
            NotMSTRZ,
            NotSTRZ,
            NotMSTRC,
            STRnZnEZF,
            NotOF,
            NotCF,
            NotZF,
            NotCvZF,
            NotSF,
            NotPF,
            NotSxOF,
            NotSxOvZF
        };
    }

    //A class which is the base of all x86 micro ops. It provides a function to
    //set necessary flags appropriately.
    class X86MicroopBase : public X86StaticInst
    {
      protected:
        const char * instMnem;
        uint8_t opSize;
        uint8_t addrSize;

        X86MicroopBase(ExtMachInst _machInst,
                const char *mnem, const char *_instMnem,
                uint64_t setFlags, OpClass __opClass) :
            X86ISA::X86StaticInst(mnem, _machInst, __opClass),
            instMnem(_instMnem)
        {
            const int ChunkSize = sizeof(unsigned long);
            const int Chunks = sizeof(setFlags) / ChunkSize;

            // Since the bitset constructor can only handle unsigned long
            // sized chunks, feed it those one at a time while oring them in.
            for (int i = 0; i < Chunks; i++) {
                unsigned shift = i * ChunkSize * 8;
                flags |= (std::bitset<Num_Flags>(setFlags >> shift) << shift);
            }
        }

        std::string generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream ss;

            ccprintf(ss, "\t%s.%s", instMnem, mnemonic);

            return ss.str();
        }

        bool checkCondition(uint64_t flags, int condition) const;

        void
        advancePC(PCState &pcState) const
        {
            if (flags[IsLastMicroop])
                pcState.uEnd();
            else
                pcState.uAdvance();
        }
    };
}

#endif //__ARCH_X86_INSTS_MICROOP_HH__