xref: /gem5/src/arch/arm/insts/mem.hh

/* Copyright (c) 2007-2008 The Florida State University
 * All rights reserved.
 *
 * 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: Stephen Hines
 */
#ifndef __ARCH_ARM_MEM_HH__
#define __ARCH_ARM_MEM_HH__

#include "arch/arm/insts/pred_inst.hh"

namespace ArmISA
{
/**
 * Base class for general Arm memory-format instructions.
 */
class Memory : public PredOp
{
  protected:

    /// Memory request flags.  See mem_req_base.hh.
    unsigned memAccessFlags;
    /// Pointer to EAComp object.
    const StaticInstPtr eaCompPtr;
    /// Pointer to MemAcc object.
    const StaticInstPtr memAccPtr;

    /// Displacement for EA calculation (signed).
    int32_t disp;
    int32_t disp8;
    int32_t up;
    int32_t hilo,
            shift_size,
            shift;

    /// Constructor
    Memory(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
           StaticInstPtr _eaCompPtr = nullStaticInstPtr,
           StaticInstPtr _memAccPtr = nullStaticInstPtr)
        : PredOp(mnem, _machInst, __opClass),
                 memAccessFlags(0),
                 eaCompPtr(_eaCompPtr), memAccPtr(_memAccPtr),
                 disp(machInst.immed11_0),
                 disp8(machInst.immed7_0 << 2),
                 up(machInst.puswl.up),
                 hilo((machInst.immedHi11_8 << 4) | machInst.immedLo3_0),
                 shift_size(machInst.shiftSize), shift(machInst.shift)
    {
        // When Up is not set, then we must subtract by the displacement
        if (!up)
        {
            disp = -disp;
            disp8 = -disp8;
            hilo = -hilo;
        }
    }

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

  public:

    const StaticInstPtr &eaCompInst() const { return eaCompPtr; }
    const StaticInstPtr &memAccInst() const { return memAccPtr; }
};

 /**
 * Base class for a few miscellaneous memory-format insts
 * that don't interpret the disp field
 */
class MemoryNoDisp : public Memory
{
  protected:
    /// Constructor
    MemoryNoDisp(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
                 StaticInstPtr _eaCompPtr = nullStaticInstPtr,
                 StaticInstPtr _memAccPtr = nullStaticInstPtr)
        : Memory(mnem, _machInst, __opClass, _eaCompPtr, _memAccPtr)
    {
    }

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

#endif //__ARCH_ARM_INSTS_MEM_HH__