src/arch/x86/insts/microregop.cc

/*
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 * Redistributions of source code must retain the above copyright notice,
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 * this software without specific prior written permission.  No right of
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 * Non-Commercial Uses.  Derivatives of the software may be shared with
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 * conditions herein which includes the Non-Commercial Use restrictions;
 * and (ii) such Derivatives of the software include the above copyright
 * notice to acknowledge the contribution from this software where
 * applicable, this list of conditions and the disclaimer below.
 *
 * 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
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 * Authors: Gabe Black
 */

#include "arch/x86/insts/microregop.hh"
#include "arch/x86/miscregs.hh"
#include "base/condcodes.hh"
#include <string>

namespace X86ISA
{
    uint64_t RegOpBase::genFlags(uint64_t oldFlags, uint64_t flagMask,
            uint64_t _dest, uint64_t _src1, uint64_t _src2,
            bool subtract) const
    {
        DPRINTF(X86, "flagMask = %#x\n", flagMask);
        uint64_t flags = oldFlags & ~flagMask;
        if(flagMask & (ECFBit | CFBit))
        {
            if(findCarry(dataSize*8, _dest, _src1, _src2))
                flags |= (flagMask & (ECFBit | CFBit));
            if(subtract)
                flags ^= (flagMask & (ECFBit | CFBit));
        }
        if(flagMask & PFBit && findParity(dataSize*8, _dest))
            flags |= PFBit;
        if(flagMask & AFBit)
        {
            if(findCarry(4, _dest, _src1, _src2))
                flags |= AFBit;
            if(subtract)
                flags ^= AFBit;
        }
        if(flagMask & (EZFBit | ZFBit) && findZero(dataSize*8, _dest))
            flags |= (flagMask & (EZFBit | ZFBit));
        if(flagMask & SFBit && findNegative(dataSize*8, _dest))
            flags |= SFBit;
        if(flagMask & OFBit && findOverflow(dataSize*8, _dest, _src1, _src2))
            flags |= OFBit;
        return flags;
    }

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

        printMnemonic(response, instMnem, mnemonic);
        printDestReg(response, 0, dataSize);
        response << ", ";
        printSrcReg(response, 0, dataSize);
        response << ", ";
        printSrcReg(response, 1, dataSize);
        return response.str();
    }

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

        printMnemonic(response, instMnem, mnemonic);
        printDestReg(response, 0, dataSize);
        response << ", ";
        printSrcReg(response, 0, dataSize);
        ccprintf(response, ", %#x", imm8);
        return response.str();
    }
}