src/cpu/simple/exec_context.hh - arm/gem5 - Git at Google

 /*
  * Copyright (c) 2014-2016 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.
  *
  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  * 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: Kevin Lim
  *          Andreas Sandberg
  *          Mitch Hayenga
  */

 #ifndef __CPU_SIMPLE_EXEC_CONTEXT_HH__
 #define __CPU_SIMPLE_EXEC_CONTEXT_HH__

 #include "arch/registers.hh"
 #include "base/types.hh"
 #include "config/the_isa.hh"
 #include "cpu/base.hh"
 #include "cpu/exec_context.hh"
 #include "cpu/reg_class.hh"
 #include "cpu/simple/base.hh"
 #include "cpu/static_inst_fwd.hh"
 #include "cpu/translation.hh"
 #include "mem/request.hh"

 class BaseSimpleCPU;

 class SimpleExecContext : public ExecContext {
   protected:
     typedef TheISA::MiscReg MiscReg;
     typedef TheISA::FloatReg FloatReg;
     typedef TheISA::FloatRegBits FloatRegBits;
     typedef TheISA::CCReg CCReg;
     using VecRegContainer = TheISA::VecRegContainer;
     using VecElem = TheISA::VecElem;

   public:
     BaseSimpleCPU *cpu;
     SimpleThread* thread;

     // This is the offset from the current pc that fetch should be performed
     Addr fetchOffset;
     // This flag says to stay at the current pc. This is useful for
     // instructions which go beyond MachInst boundaries.
     bool stayAtPC;

     // Branch prediction
     TheISA::PCState predPC;

     /** PER-THREAD STATS */

     // Number of simulated instructions
     Counter numInst;
     Stats::Scalar numInsts;
     Counter numOp;
     Stats::Scalar numOps;

     // Number of integer alu accesses
     Stats::Scalar numIntAluAccesses;

     // Number of float alu accesses
     Stats::Scalar numFpAluAccesses;

     // Number of vector alu accesses
     Stats::Scalar numVecAluAccesses;

     // Number of function calls/returns
     Stats::Scalar numCallsReturns;

     // Conditional control instructions;
     Stats::Scalar numCondCtrlInsts;

     // Number of int instructions
     Stats::Scalar numIntInsts;

     // Number of float instructions
     Stats::Scalar numFpInsts;

     // Number of vector instructions
     Stats::Scalar numVecInsts;

     // Number of integer register file accesses
     Stats::Scalar numIntRegReads;
     Stats::Scalar numIntRegWrites;

     // Number of float register file accesses
     Stats::Scalar numFpRegReads;
     Stats::Scalar numFpRegWrites;

     // Number of vector register file accesses
     mutable Stats::Scalar numVecRegReads;
     Stats::Scalar numVecRegWrites;

     // Number of condition code register file accesses
     Stats::Scalar numCCRegReads;
     Stats::Scalar numCCRegWrites;

     // Number of simulated memory references
     Stats::Scalar numMemRefs;
     Stats::Scalar numLoadInsts;
     Stats::Scalar numStoreInsts;

     // Number of idle cycles
     Stats::Formula numIdleCycles;

     // Number of busy cycles
     Stats::Formula numBusyCycles;

     // Number of simulated loads
     Counter numLoad;

     // Number of idle cycles
     Stats::Average notIdleFraction;
     Stats::Formula idleFraction;

     // Number of cycles stalled for I-cache responses
     Stats::Scalar icacheStallCycles;
     Counter lastIcacheStall;

     // Number of cycles stalled for D-cache responses
     Stats::Scalar dcacheStallCycles;
     Counter lastDcacheStall;

     /// @{
     /// Total number of branches fetched
     Stats::Scalar numBranches;
     /// Number of branches predicted as taken
     Stats::Scalar numPredictedBranches;
     /// Number of misprediced branches
     Stats::Scalar numBranchMispred;
     /// @}

    // Instruction mix histogram by OpClass
    Stats::Vector statExecutedInstType;

   public:
     /** Constructor */
     SimpleExecContext(BaseSimpleCPU* _cpu, SimpleThread* _thread)
         : cpu(_cpu), thread(_thread), fetchOffset(0), stayAtPC(false),
         numInst(0), numOp(0), numLoad(0), lastIcacheStall(0), lastDcacheStall(0)
     { }

     /** Reads an integer register. */
     IntReg readIntRegOperand(const StaticInst *si, int idx) override
     {
         numIntRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isIntReg());
         return thread->readIntReg(reg.index());
     }

     /** Sets an integer register to a value. */
     void setIntRegOperand(const StaticInst *si, int idx, IntReg val) override
     {
         numIntRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isIntReg());
         thread->setIntReg(reg.index(), val);
     }

     /** Reads a floating point register of single register width. */
     FloatReg readFloatRegOperand(const StaticInst *si, int idx) override
     {
         numFpRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isFloatReg());
         return thread->readFloatReg(reg.index());
     }

     /** Reads a floating point register in its binary format, instead
      * of by value. */
     FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx) override
     {
         numFpRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isFloatReg());
         return thread->readFloatRegBits(reg.index());
     }

     /** Sets a floating point register of single width to a value. */
     void setFloatRegOperand(const StaticInst *si, int idx,
                             FloatReg val) override
     {
         numFpRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isFloatReg());
         thread->setFloatReg(reg.index(), val);
     }

     /** Sets the bits of a floating point register of single width
      * to a binary value. */
     void setFloatRegOperandBits(const StaticInst *si, int idx,
                                 FloatRegBits val) override
     {
         numFpRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isFloatReg());
         thread->setFloatRegBits(reg.index(), val);
     }

     /** Reads a vector register. */
     const VecRegContainer&
     readVecRegOperand(const StaticInst *si, int idx) const override
     {
         numVecRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isVecReg());
         return thread->readVecReg(reg);
     }

     /** Reads a vector register for modification. */
     VecRegContainer&
     getWritableVecRegOperand(const StaticInst *si, int idx) override
     {
         numVecRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isVecReg());
         return thread->getWritableVecReg(reg);
     }

     /** Sets a vector register to a value. */
     void setVecRegOperand(const StaticInst *si, int idx,
                           const VecRegContainer& val) override
     {
         numVecRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isVecReg());
         thread->setVecReg(reg, val);
     }

     /** Vector Register Lane Interfaces. */
     /** @{ */
     /** Reads source vector lane. */
     template <typename VecElem>
     VecLaneT<VecElem, true>
     readVecLaneOperand(const StaticInst *si, int idx) const
     {
         numVecRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isVecReg());
         return thread->readVecLane<VecElem>(reg);
     }
     /** Reads source vector 8bit operand. */
     virtual ConstVecLane8
     readVec8BitLaneOperand(const StaticInst *si, int idx) const
                             override
     { return readVecLaneOperand<uint8_t>(si, idx); }

     /** Reads source vector 16bit operand. */
     virtual ConstVecLane16
     readVec16BitLaneOperand(const StaticInst *si, int idx) const
                             override
     { return readVecLaneOperand<uint16_t>(si, idx); }

     /** Reads source vector 32bit operand. */
     virtual ConstVecLane32
     readVec32BitLaneOperand(const StaticInst *si, int idx) const
                             override
     { return readVecLaneOperand<uint32_t>(si, idx); }

     /** Reads source vector 64bit operand. */
     virtual ConstVecLane64
     readVec64BitLaneOperand(const StaticInst *si, int idx) const
                             override
     { return readVecLaneOperand<uint64_t>(si, idx); }

     /** Write a lane of the destination vector operand. */
     template <typename LD>
     void
     setVecLaneOperandT(const StaticInst *si, int idx,
             const LD& val)
     {
         numVecRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isVecReg());
         return thread->setVecLane(reg, val);
     }
     /** Write a lane of the destination vector operand. */
     virtual void
     setVecLaneOperand(const StaticInst *si, int idx,
             const LaneData<LaneSize::Byte>& val) override
     { return setVecLaneOperandT(si, idx, val); }
     /** Write a lane of the destination vector operand. */
     virtual void
     setVecLaneOperand(const StaticInst *si, int idx,
             const LaneData<LaneSize::TwoByte>& val) override
     { return setVecLaneOperandT(si, idx, val); }
     /** Write a lane of the destination vector operand. */
     virtual void
     setVecLaneOperand(const StaticInst *si, int idx,
             const LaneData<LaneSize::FourByte>& val) override
     { return setVecLaneOperandT(si, idx, val); }
     /** Write a lane of the destination vector operand. */
     virtual void
     setVecLaneOperand(const StaticInst *si, int idx,
             const LaneData<LaneSize::EightByte>& val) override
     { return setVecLaneOperandT(si, idx, val); }
     /** @} */

     /** Reads an element of a vector register. */
     VecElem readVecElemOperand(const StaticInst *si, int idx) const override
     {
         numVecRegReads++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isVecElem());
         return thread->readVecElem(reg);
     }

     /** Sets an element of a vector register to a value. */
     void setVecElemOperand(const StaticInst *si, int idx,
                            const VecElem val) override
     {
         numVecRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isVecElem());
         thread->setVecElem(reg, val);
     }

     CCReg readCCRegOperand(const StaticInst *si, int idx) override
     {
         numCCRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isCCReg());
         return thread->readCCReg(reg.index());
     }

     void setCCRegOperand(const StaticInst *si, int idx, CCReg val) override
     {
         numCCRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isCCReg());
         thread->setCCReg(reg.index(), val);
     }

     MiscReg readMiscRegOperand(const StaticInst *si, int idx) override
     {
         numIntRegReads++;
         const RegId& reg = si->srcRegIdx(idx);
         assert(reg.isMiscReg());
         return thread->readMiscReg(reg.index());
     }

     void setMiscRegOperand(const StaticInst *si, int idx,
                            const MiscReg &val) override
     {
         numIntRegWrites++;
         const RegId& reg = si->destRegIdx(idx);
         assert(reg.isMiscReg());
         thread->setMiscReg(reg.index(), val);
     }

     /**
      * Reads a miscellaneous register, handling any architectural
      * side effects due to reading that register.
      */
     MiscReg readMiscReg(int misc_reg) override
     {
         numIntRegReads++;
         return thread->readMiscReg(misc_reg);
     }

     /**
      * Sets a miscellaneous register, handling any architectural
      * side effects due to writing that register.
      */
     void setMiscReg(int misc_reg, const MiscReg &val) override
     {
         numIntRegWrites++;
         thread->setMiscReg(misc_reg, val);
     }

     PCState pcState() const override
     {
         return thread->pcState();
     }

     void pcState(const PCState &val) override
     {
         thread->pcState(val);
     }


     Fault readMem(Addr addr, uint8_t *data, unsigned int size,
                   Request::Flags flags) override
     {
         return cpu->readMem(addr, data, size, flags);
     }

     Fault initiateMemRead(Addr addr, unsigned int size,
                           Request::Flags flags) override
     {
         return cpu->initiateMemRead(addr, size, flags);
     }

     Fault writeMem(uint8_t *data, unsigned int size, Addr addr,
                    Request::Flags flags, uint64_t *res) override
     {
         return cpu->writeMem(data, size, addr, flags, res);
     }

     /**
      * Sets the number of consecutive store conditional failures.
      */
     void setStCondFailures(unsigned int sc_failures) override
     {
         thread->setStCondFailures(sc_failures);
     }

     /**
      * Returns the number of consecutive store conditional failures.
      */
     unsigned int readStCondFailures() const override
     {
         return thread->readStCondFailures();
     }

     /**
      * Executes a syscall specified by the callnum.
      */
     void syscall(int64_t callnum, Fault *fault) override
     {
         if (FullSystem)
             panic("Syscall emulation isn't available in FS mode.");

         thread->syscall(callnum, fault);
     }

     /** Returns a pointer to the ThreadContext. */
     ThreadContext *tcBase() override
     {
         return thread->getTC();
     }

     /**
      * Somewhat Alpha-specific function that handles returning from an
      * error or interrupt.
      */
     Fault hwrei() override
     {
         return thread->hwrei();
     }

     /**
      * Check for special simulator handling of specific PAL calls.  If
      * return value is false, actual PAL call will be suppressed.
      */
     bool simPalCheck(int palFunc) override
     {
         return thread->simPalCheck(palFunc);
     }

     bool readPredicate() override
     {
         return thread->readPredicate();
     }

     void setPredicate(bool val) override
     {
         thread->setPredicate(val);

         if (cpu->traceData) {
             cpu->traceData->setPredicate(val);
         }
     }

     /**
      * Invalidate a page in the DTLB <i>and</i> ITLB.
      */
     void demapPage(Addr vaddr, uint64_t asn) override
     {
         thread->demapPage(vaddr, asn);
     }

     void armMonitor(Addr address) override
     {
         cpu->armMonitor(thread->threadId(), address);
     }

     bool mwait(PacketPtr pkt) override
     {
         return cpu->mwait(thread->threadId(), pkt);
     }

     void mwaitAtomic(ThreadContext *tc) override
     {
         cpu->mwaitAtomic(thread->threadId(), tc, thread->dtb);
     }

     AddressMonitor *getAddrMonitor() override
     {
         return cpu->getCpuAddrMonitor(thread->threadId());
     }

 #if THE_ISA == MIPS_ISA
     MiscReg readRegOtherThread(const RegId& reg,
                                ThreadID tid = InvalidThreadID)
         override
     {
         panic("Simple CPU models do not support multithreaded "
               "register access.");
     }

     void setRegOtherThread(const RegId& reg, MiscReg val,
                            ThreadID tid = InvalidThreadID) override
     {
         panic("Simple CPU models do not support multithreaded "
               "register access.");
     }

 #endif

 };

 #endif // __CPU_EXEC_CONTEXT_HH__
	/*
	* Copyright (c) 2014-2016 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.
	*
	* Copyright (c) 2002-2005 The Regents of The University of Michigan
	* 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: Kevin Lim
	* Andreas Sandberg
	* Mitch Hayenga
	*/

	#ifndef __CPU_SIMPLE_EXEC_CONTEXT_HH__
	#define __CPU_SIMPLE_EXEC_CONTEXT_HH__

	#include "arch/registers.hh"
	#include "base/types.hh"
	#include "config/the_isa.hh"
	#include "cpu/base.hh"
	#include "cpu/exec_context.hh"
	#include "cpu/reg_class.hh"
	#include "cpu/simple/base.hh"
	#include "cpu/static_inst_fwd.hh"
	#include "cpu/translation.hh"
	#include "mem/request.hh"

	class BaseSimpleCPU;

	class SimpleExecContext : public ExecContext {
	protected:
	typedef TheISA::MiscReg MiscReg;
	typedef TheISA::FloatReg FloatReg;
	typedef TheISA::FloatRegBits FloatRegBits;
	typedef TheISA::CCReg CCReg;
	using VecRegContainer = TheISA::VecRegContainer;
	using VecElem = TheISA::VecElem;

	public:
	BaseSimpleCPU *cpu;
	SimpleThread* thread;

	// This is the offset from the current pc that fetch should be performed
	Addr fetchOffset;
	// This flag says to stay at the current pc. This is useful for
	// instructions which go beyond MachInst boundaries.
	bool stayAtPC;

	// Branch prediction
	TheISA::PCState predPC;

	/** PER-THREAD STATS */

	// Number of simulated instructions
	Counter numInst;
	Stats::Scalar numInsts;
	Counter numOp;
	Stats::Scalar numOps;

	// Number of integer alu accesses
	Stats::Scalar numIntAluAccesses;

	// Number of float alu accesses
	Stats::Scalar numFpAluAccesses;

	// Number of vector alu accesses
	Stats::Scalar numVecAluAccesses;

	// Number of function calls/returns
	Stats::Scalar numCallsReturns;

	// Conditional control instructions;
	Stats::Scalar numCondCtrlInsts;

	// Number of int instructions
	Stats::Scalar numIntInsts;

	// Number of float instructions
	Stats::Scalar numFpInsts;

	// Number of vector instructions
	Stats::Scalar numVecInsts;

	// Number of integer register file accesses
	Stats::Scalar numIntRegReads;
	Stats::Scalar numIntRegWrites;

	// Number of float register file accesses
	Stats::Scalar numFpRegReads;
	Stats::Scalar numFpRegWrites;

	// Number of vector register file accesses
	mutable Stats::Scalar numVecRegReads;
	Stats::Scalar numVecRegWrites;

	// Number of condition code register file accesses
	Stats::Scalar numCCRegReads;
	Stats::Scalar numCCRegWrites;

	// Number of simulated memory references
	Stats::Scalar numMemRefs;
	Stats::Scalar numLoadInsts;
	Stats::Scalar numStoreInsts;

	// Number of idle cycles
	Stats::Formula numIdleCycles;

	// Number of busy cycles
	Stats::Formula numBusyCycles;

	// Number of simulated loads
	Counter numLoad;

	// Number of idle cycles
	Stats::Average notIdleFraction;
	Stats::Formula idleFraction;

	// Number of cycles stalled for I-cache responses
	Stats::Scalar icacheStallCycles;
	Counter lastIcacheStall;

	// Number of cycles stalled for D-cache responses
	Stats::Scalar dcacheStallCycles;
	Counter lastDcacheStall;

	/// @{
	/// Total number of branches fetched
	Stats::Scalar numBranches;
	/// Number of branches predicted as taken
	Stats::Scalar numPredictedBranches;
	/// Number of misprediced branches
	Stats::Scalar numBranchMispred;
	/// @}

	// Instruction mix histogram by OpClass
	Stats::Vector statExecutedInstType;

	public:
	/** Constructor */
	SimpleExecContext(BaseSimpleCPU* _cpu, SimpleThread* _thread)
	: cpu(_cpu), thread(_thread), fetchOffset(0), stayAtPC(false),
	numInst(0), numOp(0), numLoad(0), lastIcacheStall(0), lastDcacheStall(0)
	{ }

	/** Reads an integer register. */
	IntReg readIntRegOperand(const StaticInst *si, int idx) override
	{
	numIntRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isIntReg());
	return thread->readIntReg(reg.index());
	}

	/** Sets an integer register to a value. */
	void setIntRegOperand(const StaticInst *si, int idx, IntReg val) override
	{
	numIntRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isIntReg());
	thread->setIntReg(reg.index(), val);
	}

	/** Reads a floating point register of single register width. */
	FloatReg readFloatRegOperand(const StaticInst *si, int idx) override
	{
	numFpRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isFloatReg());
	return thread->readFloatReg(reg.index());
	}

	/** Reads a floating point register in its binary format, instead
	* of by value. */
	FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx) override
	{
	numFpRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isFloatReg());
	return thread->readFloatRegBits(reg.index());
	}

	/** Sets a floating point register of single width to a value. */
	void setFloatRegOperand(const StaticInst *si, int idx,
	FloatReg val) override
	{
	numFpRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isFloatReg());
	thread->setFloatReg(reg.index(), val);
	}

	/** Sets the bits of a floating point register of single width
	* to a binary value. */
	void setFloatRegOperandBits(const StaticInst *si, int idx,
	FloatRegBits val) override
	{
	numFpRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isFloatReg());
	thread->setFloatRegBits(reg.index(), val);
	}

	/** Reads a vector register. */
	const VecRegContainer&
	readVecRegOperand(const StaticInst *si, int idx) const override
	{
	numVecRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isVecReg());
	return thread->readVecReg(reg);
	}

	/** Reads a vector register for modification. */
	VecRegContainer&
	getWritableVecRegOperand(const StaticInst *si, int idx) override
	{
	numVecRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isVecReg());
	return thread->getWritableVecReg(reg);
	}

	/** Sets a vector register to a value. */
	void setVecRegOperand(const StaticInst *si, int idx,
	const VecRegContainer& val) override
	{
	numVecRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isVecReg());
	thread->setVecReg(reg, val);
	}

	/** Vector Register Lane Interfaces. */
	/** @{ */
	/** Reads source vector lane. */
	template <typename VecElem>
	VecLaneT<VecElem, true>
	readVecLaneOperand(const StaticInst *si, int idx) const
	{
	numVecRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isVecReg());
	return thread->readVecLane<VecElem>(reg);
	}
	/** Reads source vector 8bit operand. */
	virtual ConstVecLane8
	readVec8BitLaneOperand(const StaticInst *si, int idx) const
	override
	{ return readVecLaneOperand<uint8_t>(si, idx); }

	/** Reads source vector 16bit operand. */
	virtual ConstVecLane16
	readVec16BitLaneOperand(const StaticInst *si, int idx) const
	override
	{ return readVecLaneOperand<uint16_t>(si, idx); }

	/** Reads source vector 32bit operand. */
	virtual ConstVecLane32
	readVec32BitLaneOperand(const StaticInst *si, int idx) const
	override
	{ return readVecLaneOperand<uint32_t>(si, idx); }

	/** Reads source vector 64bit operand. */
	virtual ConstVecLane64
	readVec64BitLaneOperand(const StaticInst *si, int idx) const
	override
	{ return readVecLaneOperand<uint64_t>(si, idx); }

	/** Write a lane of the destination vector operand. */
	template <typename LD>
	void
	setVecLaneOperandT(const StaticInst *si, int idx,
	const LD& val)
	{
	numVecRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isVecReg());
	return thread->setVecLane(reg, val);
	}
	/** Write a lane of the destination vector operand. */
	virtual void
	setVecLaneOperand(const StaticInst *si, int idx,
	const LaneData<LaneSize::Byte>& val) override
	{ return setVecLaneOperandT(si, idx, val); }
	/** Write a lane of the destination vector operand. */
	virtual void
	setVecLaneOperand(const StaticInst *si, int idx,
	const LaneData<LaneSize::TwoByte>& val) override
	{ return setVecLaneOperandT(si, idx, val); }
	/** Write a lane of the destination vector operand. */
	virtual void
	setVecLaneOperand(const StaticInst *si, int idx,
	const LaneData<LaneSize::FourByte>& val) override
	{ return setVecLaneOperandT(si, idx, val); }
	/** Write a lane of the destination vector operand. */
	virtual void
	setVecLaneOperand(const StaticInst *si, int idx,
	const LaneData<LaneSize::EightByte>& val) override
	{ return setVecLaneOperandT(si, idx, val); }
	/** @} */

	/** Reads an element of a vector register. */
	VecElem readVecElemOperand(const StaticInst *si, int idx) const override
	{
	numVecRegReads++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isVecElem());
	return thread->readVecElem(reg);
	}

	/** Sets an element of a vector register to a value. */
	void setVecElemOperand(const StaticInst *si, int idx,
	const VecElem val) override
	{
	numVecRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isVecElem());
	thread->setVecElem(reg, val);
	}

	CCReg readCCRegOperand(const StaticInst *si, int idx) override
	{
	numCCRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isCCReg());
	return thread->readCCReg(reg.index());
	}

	void setCCRegOperand(const StaticInst *si, int idx, CCReg val) override
	{
	numCCRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isCCReg());
	thread->setCCReg(reg.index(), val);
	}

	MiscReg readMiscRegOperand(const StaticInst *si, int idx) override
	{
	numIntRegReads++;
	const RegId& reg = si->srcRegIdx(idx);
	assert(reg.isMiscReg());
	return thread->readMiscReg(reg.index());
	}

	void setMiscRegOperand(const StaticInst *si, int idx,
	const MiscReg &val) override
	{
	numIntRegWrites++;
	const RegId& reg = si->destRegIdx(idx);
	assert(reg.isMiscReg());
	thread->setMiscReg(reg.index(), val);
	}

	/**
	* Reads a miscellaneous register, handling any architectural
	* side effects due to reading that register.
	*/
	MiscReg readMiscReg(int misc_reg) override
	{
	numIntRegReads++;
	return thread->readMiscReg(misc_reg);
	}

	/**
	* Sets a miscellaneous register, handling any architectural
	* side effects due to writing that register.
	*/
	void setMiscReg(int misc_reg, const MiscReg &val) override
	{
	numIntRegWrites++;
	thread->setMiscReg(misc_reg, val);
	}

	PCState pcState() const override
	{
	return thread->pcState();
	}

	void pcState(const PCState &val) override
	{
	thread->pcState(val);
	}


	Fault readMem(Addr addr, uint8_t *data, unsigned int size,
	Request::Flags flags) override
	{
	return cpu->readMem(addr, data, size, flags);
	}

	Fault initiateMemRead(Addr addr, unsigned int size,
	Request::Flags flags) override
	{
	return cpu->initiateMemRead(addr, size, flags);
	}

	Fault writeMem(uint8_t *data, unsigned int size, Addr addr,
	Request::Flags flags, uint64_t *res) override
	{
	return cpu->writeMem(data, size, addr, flags, res);
	}

	/**
	* Sets the number of consecutive store conditional failures.
	*/
	void setStCondFailures(unsigned int sc_failures) override
	{
	thread->setStCondFailures(sc_failures);
	}

	/**
	* Returns the number of consecutive store conditional failures.
	*/
	unsigned int readStCondFailures() const override
	{
	return thread->readStCondFailures();
	}

	/**
	* Executes a syscall specified by the callnum.
	*/
	void syscall(int64_t callnum, Fault *fault) override
	{
	if (FullSystem)
	panic("Syscall emulation isn't available in FS mode.");

	thread->syscall(callnum, fault);
	}

	/** Returns a pointer to the ThreadContext. */
	ThreadContext *tcBase() override
	{
	return thread->getTC();
	}

	/**
	* Somewhat Alpha-specific function that handles returning from an
	* error or interrupt.
	*/
	Fault hwrei() override
	{
	return thread->hwrei();
	}

	/**
	* Check for special simulator handling of specific PAL calls. If
	* return value is false, actual PAL call will be suppressed.
	*/
	bool simPalCheck(int palFunc) override
	{
	return thread->simPalCheck(palFunc);
	}

	bool readPredicate() override
	{
	return thread->readPredicate();
	}

	void setPredicate(bool val) override
	{
	thread->setPredicate(val);

	if (cpu->traceData) {
	cpu->traceData->setPredicate(val);
	}
	}

	/**
	* Invalidate a page in the DTLB <i>and</i> ITLB.
	*/
	void demapPage(Addr vaddr, uint64_t asn) override
	{
	thread->demapPage(vaddr, asn);
	}

	void armMonitor(Addr address) override
	{
	cpu->armMonitor(thread->threadId(), address);
	}

	bool mwait(PacketPtr pkt) override
	{
	return cpu->mwait(thread->threadId(), pkt);
	}

	void mwaitAtomic(ThreadContext *tc) override
	{
	cpu->mwaitAtomic(thread->threadId(), tc, thread->dtb);
	}

	AddressMonitor *getAddrMonitor() override
	{
	return cpu->getCpuAddrMonitor(thread->threadId());
	}

	#if THE_ISA == MIPS_ISA
	MiscReg readRegOtherThread(const RegId& reg,
	ThreadID tid = InvalidThreadID)
	override
	{
	panic("Simple CPU models do not support multithreaded "
	"register access.");
	}

	void setRegOtherThread(const RegId& reg, MiscReg val,
	ThreadID tid = InvalidThreadID) override
	{
	panic("Simple CPU models do not support multithreaded "
	"register access.");
	}

	#endif

	};

	#endif // __CPU_EXEC_CONTEXT_HH__