/*
 * 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.
 */

#ifndef __ARCH_X86_INSTS_STATICINST_HH__
#define __ARCH_X86_INSTS_STATICINST_HH__

#include "base/trace.hh"
#include "cpu/static_inst.hh"
#include "debug/X86.hh"

namespace X86ISA
{

/**
 * Class for register indices passed to instruction constructors. Using a
 * wrapper struct for these lets take advantage of the compiler's type
 * checking.
 */
struct InstRegIndex : public RegId
{
    explicit InstRegIndex(RegIndex _idx) :
       RegId(computeRegClass(_idx), _idx) {}

  private:
    // TODO: As X86 register index definition is highly built on the
    //       unified space concept, it is easier for the moment to rely on
    //       an helper function to compute the RegClass. It would be nice
    //       to fix those definition and get rid of this.
    RegClass
    computeRegClass(RegIndex _idx)
    {
        if (_idx < FP_Reg_Base) {
            return IntRegClass;
        } else if (_idx < CC_Reg_Base) {
            return FloatRegClass;
        } else if (_idx < Misc_Reg_Base) {
            return CCRegClass;
        } else {
            return MiscRegClass;
        }
    }
};

/**
 * Base class for all X86 static instructions.
 */

class X86StaticInst : public StaticInst
{
  protected:
    using ExtMachInst = X86ISA::ExtMachInst;

    // Constructor.
    X86StaticInst(const char *mnem,
         ExtMachInst _machInst, OpClass __opClass)
            : StaticInst(mnem, _machInst, __opClass)
        {
        }

    std::string generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const override;

    void printMnemonic(std::ostream &os, const char * mnemonic) const;
    void printMnemonic(std::ostream &os, const char * instMnemonic,
            const char * mnemonic) const;

    void printSegment(std::ostream &os, int segment) const;

    void printReg(std::ostream &os, RegId reg, int size) const;
    void printSrcReg(std::ostream &os, int reg, int size) const;
    void printDestReg(std::ostream &os, int reg, int size) const;
    void printMem(std::ostream &os, uint8_t segment,
            uint8_t scale, RegIndex index, RegIndex base,
            uint64_t disp, uint8_t addressSize, bool rip) const;

    inline uint64_t
    merge(uint64_t into, uint64_t val, int size) const
    {
        X86IntReg reg = into;
        if (destRegIdx(0).index() & IntFoldBit) {
            reg.H = val;
            return reg;
        }
        switch(size) {
          case 1:
            reg.L = val;
            break;
          case 2:
            reg.X = val;
            break;
          case 4:
            //XXX Check if this should be zeroed or sign extended
            reg = 0;
            reg.E = val;
            break;
          case 8:
            reg.R = val;
            break;
          default:
            panic("Tried to merge with unrecognized size %d.\n", size);
        }
        return reg;
    }

    inline uint64_t
    pick(uint64_t from, int idx, int size) const
    {
        X86IntReg reg = from;
        DPRINTF(X86, "Picking with size %d\n", size);
        if (srcRegIdx(idx).index() & IntFoldBit)
            return reg.H;
        switch(size) {
          case 1:
            return reg.L;
          case 2:
            return reg.X;
          case 4:
            return reg.E;
          case 8:
            return reg.R;
          default:
            panic("Tried to pick with unrecognized size %d.\n", size);
        }
    }

    inline int64_t
    signedPick(uint64_t from, int idx, int size) const
    {
        X86IntReg reg = from;
        DPRINTF(X86, "Picking with size %d\n", size);
        if (srcRegIdx(idx).index() & IntFoldBit)
            return reg.SH;
        switch(size) {
          case 1:
            return reg.SL;
          case 2:
            return reg.SX;
          case 4:
            return reg.SE;
          case 8:
            return reg.SR;
          default:
            panic("Tried to pick with unrecognized size %d.\n", size);
        }
    }

    void
    advancePC(PCState &pcState) const override
    {
        pcState.advance();
    }
};
}

#endif //__ARCH_X86_INSTS_STATICINST_HH__