cpu/exec_context.hh - amd/gem5 - Git at Google

 /*
  * Copyright (c) 2006 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.
  */

 #ifndef __CPU_EXEC_CONTEXT_HH__
 #define __CPU_EXEC_CONTEXT_HH__

 #include "config/full_system.hh"
 #include "mem/mem_req.hh"
 #include "sim/faults.hh"
 #include "sim/host.hh"
 #include "sim/serialize.hh"
 #include "sim/byteswap.hh"

 // forward declaration: see functional_memory.hh
 // @todo: Figure out a more architecture independent way to obtain the ITB and
 // DTB pointers.
 class AlphaDTB;
 class AlphaITB;
 class BaseCPU;
 class EndQuiesceEvent;
 class Event;
 class FunctionalMemory;
 class PhysicalMemory;
 class Process;
 class System;
 namespace Kernel {
     class Statistics;
 };

 class ExecContext
 {
   protected:
     typedef TheISA::RegFile RegFile;
     typedef TheISA::MachInst MachInst;
     typedef TheISA::IntReg IntReg;
     typedef TheISA::MiscRegFile MiscRegFile;
     typedef TheISA::MiscReg MiscReg;
   public:
     enum Status
     {
         /// Initialized but not running yet.  All CPUs start in
         /// this state, but most transition to Active on cycle 1.
         /// In MP or SMT systems, non-primary contexts will stay
         /// in this state until a thread is assigned to them.
         Unallocated,

         /// Running.  Instructions should be executed only when
         /// the context is in this state.
         Active,

         /// Temporarily inactive.  Entered while waiting for
         /// synchronization, etc.
         Suspended,

         /// Permanently shut down.  Entered when target executes
         /// m5exit pseudo-instruction.  When all contexts enter
         /// this state, the simulation will terminate.
         Halted
     };

     virtual ~ExecContext() { };

     virtual BaseCPU *getCpuPtr() = 0;

     virtual void setCpuId(int id) = 0;

     virtual int readCpuId() = 0;

     virtual FunctionalMemory *getMemPtr() = 0;

 #if FULL_SYSTEM
     virtual System *getSystemPtr() = 0;

     virtual PhysicalMemory *getPhysMemPtr() = 0;

     virtual AlphaITB *getITBPtr() = 0;

     virtual AlphaDTB * getDTBPtr() = 0;

     virtual Kernel::Statistics *getKernelStats() = 0;
 #else
     virtual Process *getProcessPtr() = 0;
 #endif

     virtual Status status() const = 0;

     virtual void setStatus(Status new_status) = 0;

     /// Set the status to Active.  Optional delay indicates number of
     /// cycles to wait before beginning execution.
     virtual void activate(int delay = 1) = 0;

     /// Set the status to Suspended.
     virtual void suspend() = 0;

     /// Set the status to Unallocated.
     virtual void deallocate() = 0;

     /// Set the status to Halted.
     virtual void halt() = 0;

 #if FULL_SYSTEM
     virtual void dumpFuncProfile() = 0;
 #endif

     virtual void takeOverFrom(ExecContext *old_context) = 0;

     virtual void regStats(const std::string &name) = 0;

     virtual void serialize(std::ostream &os) = 0;
     virtual void unserialize(Checkpoint *cp, const std::string &section) = 0;

 #if FULL_SYSTEM
     virtual EndQuiesceEvent *getQuiesceEvent() = 0;

     // Not necessarily the best location for these...
     // Having an extra function just to read these is obnoxious
     virtual Tick readLastActivate() = 0;
     virtual Tick readLastSuspend() = 0;

     virtual void profileClear() = 0;
     virtual void profileSample() = 0;
 #endif

     virtual int getThreadNum() = 0;

     // Also somewhat obnoxious.  Really only used for the TLB fault.
     // However, may be quite useful in SPARC.
     virtual TheISA::MachInst getInst() = 0;

     virtual void copyArchRegs(ExecContext *xc) = 0;

     virtual void clearArchRegs() = 0;

     //
     // New accessors for new decoder.
     //
     virtual uint64_t readIntReg(int reg_idx) = 0;

     virtual float readFloatRegSingle(int reg_idx) = 0;

     virtual double readFloatRegDouble(int reg_idx) = 0;

     virtual uint64_t readFloatRegInt(int reg_idx) = 0;

     virtual void setIntReg(int reg_idx, uint64_t val) = 0;

     virtual void setFloatRegSingle(int reg_idx, float val) = 0;

     virtual void setFloatRegDouble(int reg_idx, double val) = 0;

     virtual void setFloatRegInt(int reg_idx, uint64_t val) = 0;

     virtual uint64_t readPC() = 0;

     virtual void setPC(uint64_t val) = 0;

     virtual uint64_t readNextPC() = 0;

     virtual void setNextPC(uint64_t val) = 0;

     virtual MiscReg readMiscReg(int misc_reg) = 0;

     virtual MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault) = 0;

     virtual Fault setMiscReg(int misc_reg, const MiscReg &val) = 0;

     virtual Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val) = 0;

     // Also not necessarily the best location for these two.  Hopefully will go
     // away once we decide upon where st cond failures goes.
     virtual unsigned readStCondFailures() = 0;

     virtual void setStCondFailures(unsigned sc_failures) = 0;

 #if FULL_SYSTEM
     virtual bool inPalMode() = 0;
 #endif

     // Only really makes sense for old CPU model.  Still could be useful though.
     virtual bool misspeculating() = 0;

 #if !FULL_SYSTEM
     virtual IntReg getSyscallArg(int i) = 0;

     // used to shift args for indirect syscall
     virtual void setSyscallArg(int i, IntReg val) = 0;

     virtual void setSyscallReturn(SyscallReturn return_value) = 0;

 //    virtual void syscall() = 0;

     // Same with st cond failures.
     virtual Counter readFuncExeInst() = 0;
 #endif
 };

 template <class XC>
 class ProxyExecContext : public ExecContext
 {
   public:
     ProxyExecContext(XC *actual_xc)
     { actualXC = actual_xc; }

   private:
     XC *actualXC;

   public:

     BaseCPU *getCpuPtr() { return actualXC->getCpuPtr(); }

     void setCpuId(int id) { actualXC->setCpuId(id); }

     int readCpuId() { return actualXC->readCpuId(); }

     FunctionalMemory *getMemPtr() { return actualXC->getMemPtr(); }

 #if FULL_SYSTEM
     System *getSystemPtr() { return actualXC->getSystemPtr(); }

     PhysicalMemory *getPhysMemPtr() { return actualXC->getPhysMemPtr(); }

     AlphaITB *getITBPtr() { return actualXC->getITBPtr(); }

     AlphaDTB *getDTBPtr() { return actualXC->getDTBPtr(); }

     Kernel::Statistics *getKernelStats() { return actualXC->getKernelStats(); }
 #else
     Process *getProcessPtr() { return actualXC->getProcessPtr(); }
 #endif

     Status status() const { return actualXC->status(); }

     void setStatus(Status new_status) { actualXC->setStatus(new_status); }

     /// Set the status to Active.  Optional delay indicates number of
     /// cycles to wait before beginning execution.
     void activate(int delay = 1) { actualXC->activate(delay); }

     /// Set the status to Suspended.
     void suspend() { actualXC->suspend(); }

     /// Set the status to Unallocated.
     void deallocate() { actualXC->deallocate(); }

     /// Set the status to Halted.
     void halt() { actualXC->halt(); }

 #if FULL_SYSTEM
     void dumpFuncProfile() { actualXC->dumpFuncProfile(); }
 #endif

     void takeOverFrom(ExecContext *oldContext)
     { actualXC->takeOverFrom(oldContext); }

     void regStats(const std::string &name) { actualXC->regStats(name); }

     void serialize(std::ostream &os) { actualXC->serialize(os); }
     void unserialize(Checkpoint *cp, const std::string &section)
     { actualXC->unserialize(cp, section); }

 #if FULL_SYSTEM
     EndQuiesceEvent *getQuiesceEvent() { return actualXC->getQuiesceEvent(); }

     Tick readLastActivate() { return actualXC->readLastActivate(); }
     Tick readLastSuspend() { return actualXC->readLastSuspend(); }

     void profileClear() { return actualXC->profileClear(); }
     void profileSample() { return actualXC->profileSample(); }
 #endif

     int getThreadNum() { return actualXC->getThreadNum(); }

     // @todo: Do I need this?
     MachInst getInst() { return actualXC->getInst(); }

     // @todo: Do I need this?
     void copyArchRegs(ExecContext *xc) { actualXC->copyArchRegs(xc); }

     void clearArchRegs() { actualXC->clearArchRegs(); }

     //
     // New accessors for new decoder.
     //
     uint64_t readIntReg(int reg_idx)
     { return actualXC->readIntReg(reg_idx); }

     float readFloatRegSingle(int reg_idx)
     { return actualXC->readFloatRegSingle(reg_idx); }

     double readFloatRegDouble(int reg_idx)
     { return actualXC->readFloatRegDouble(reg_idx); }

     uint64_t readFloatRegInt(int reg_idx)
     { return actualXC->readFloatRegInt(reg_idx); }

     void setIntReg(int reg_idx, uint64_t val)
     { actualXC->setIntReg(reg_idx, val); }

     void setFloatRegSingle(int reg_idx, float val)
     { actualXC->setFloatRegSingle(reg_idx, val); }

     void setFloatRegDouble(int reg_idx, double val)
     { actualXC->setFloatRegDouble(reg_idx, val); }

     void setFloatRegInt(int reg_idx, uint64_t val)
     { actualXC->setFloatRegInt(reg_idx, val); }

     uint64_t readPC() { return actualXC->readPC(); }

     void setPC(uint64_t val) { actualXC->setPC(val); }

     uint64_t readNextPC() { return actualXC->readNextPC(); }

     void setNextPC(uint64_t val) { actualXC->setNextPC(val); }

     MiscReg readMiscReg(int misc_reg)
     { return actualXC->readMiscReg(misc_reg); }

     MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault)
     { return actualXC->readMiscRegWithEffect(misc_reg, fault); }

     Fault setMiscReg(int misc_reg, const MiscReg &val)
     { return actualXC->setMiscReg(misc_reg, val); }

     Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val)
     { return actualXC->setMiscRegWithEffect(misc_reg, val); }

     unsigned readStCondFailures()
     { return actualXC->readStCondFailures(); }

     void setStCondFailures(unsigned sc_failures)
     { actualXC->setStCondFailures(sc_failures); }
 #if FULL_SYSTEM
     bool inPalMode() { return actualXC->inPalMode(); }
 #endif

     // @todo: Fix this!
     bool misspeculating() { return actualXC->misspeculating(); }

 #if !FULL_SYSTEM
     IntReg getSyscallArg(int i) { return actualXC->getSyscallArg(i); }

     // used to shift args for indirect syscall
     void setSyscallArg(int i, IntReg val)
     { actualXC->setSyscallArg(i, val); }

     void setSyscallReturn(SyscallReturn return_value)
     { actualXC->setSyscallReturn(return_value); }

 //    void syscall() { actualXC->syscall(); }

     Counter readFuncExeInst() { return actualXC->readFuncExeInst(); }
 #endif
 };

 #endif
	/*
	* Copyright (c) 2006 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.
	*/

	#ifndef __CPU_EXEC_CONTEXT_HH__
	#define __CPU_EXEC_CONTEXT_HH__

	#include "config/full_system.hh"
	#include "mem/mem_req.hh"
	#include "sim/faults.hh"
	#include "sim/host.hh"
	#include "sim/serialize.hh"
	#include "sim/byteswap.hh"

	// forward declaration: see functional_memory.hh
	// @todo: Figure out a more architecture independent way to obtain the ITB and
	// DTB pointers.
	class AlphaDTB;
	class AlphaITB;
	class BaseCPU;
	class EndQuiesceEvent;
	class Event;
	class FunctionalMemory;
	class PhysicalMemory;
	class Process;
	class System;
	namespace Kernel {
	class Statistics;
	};

	class ExecContext
	{
	protected:
	typedef TheISA::RegFile RegFile;
	typedef TheISA::MachInst MachInst;
	typedef TheISA::IntReg IntReg;
	typedef TheISA::MiscRegFile MiscRegFile;
	typedef TheISA::MiscReg MiscReg;
	public:
	enum Status
	{
	/// Initialized but not running yet. All CPUs start in
	/// this state, but most transition to Active on cycle 1.
	/// In MP or SMT systems, non-primary contexts will stay
	/// in this state until a thread is assigned to them.
	Unallocated,

	/// Running. Instructions should be executed only when
	/// the context is in this state.
	Active,

	/// Temporarily inactive. Entered while waiting for
	/// synchronization, etc.
	Suspended,

	/// Permanently shut down. Entered when target executes
	/// m5exit pseudo-instruction. When all contexts enter
	/// this state, the simulation will terminate.
	Halted
	};

	virtual ~ExecContext() { };

	virtual BaseCPU *getCpuPtr() = 0;

	virtual void setCpuId(int id) = 0;

	virtual int readCpuId() = 0;

	virtual FunctionalMemory *getMemPtr() = 0;

	#if FULL_SYSTEM
	virtual System *getSystemPtr() = 0;

	virtual PhysicalMemory *getPhysMemPtr() = 0;

	virtual AlphaITB *getITBPtr() = 0;

	virtual AlphaDTB * getDTBPtr() = 0;

	virtual Kernel::Statistics *getKernelStats() = 0;
	#else
	virtual Process *getProcessPtr() = 0;
	#endif

	virtual Status status() const = 0;

	virtual void setStatus(Status new_status) = 0;

	/// Set the status to Active. Optional delay indicates number of
	/// cycles to wait before beginning execution.
	virtual void activate(int delay = 1) = 0;

	/// Set the status to Suspended.
	virtual void suspend() = 0;

	/// Set the status to Unallocated.
	virtual void deallocate() = 0;

	/// Set the status to Halted.
	virtual void halt() = 0;

	#if FULL_SYSTEM
	virtual void dumpFuncProfile() = 0;
	#endif

	virtual void takeOverFrom(ExecContext *old_context) = 0;

	virtual void regStats(const std::string &name) = 0;

	virtual void serialize(std::ostream &os) = 0;
	virtual void unserialize(Checkpoint *cp, const std::string &section) = 0;

	#if FULL_SYSTEM
	virtual EndQuiesceEvent *getQuiesceEvent() = 0;

	// Not necessarily the best location for these...
	// Having an extra function just to read these is obnoxious
	virtual Tick readLastActivate() = 0;
	virtual Tick readLastSuspend() = 0;

	virtual void profileClear() = 0;
	virtual void profileSample() = 0;
	#endif

	virtual int getThreadNum() = 0;

	// Also somewhat obnoxious. Really only used for the TLB fault.
	// However, may be quite useful in SPARC.
	virtual TheISA::MachInst getInst() = 0;

	virtual void copyArchRegs(ExecContext *xc) = 0;

	virtual void clearArchRegs() = 0;

	//
	// New accessors for new decoder.
	//
	virtual uint64_t readIntReg(int reg_idx) = 0;

	virtual float readFloatRegSingle(int reg_idx) = 0;

	virtual double readFloatRegDouble(int reg_idx) = 0;

	virtual uint64_t readFloatRegInt(int reg_idx) = 0;

	virtual void setIntReg(int reg_idx, uint64_t val) = 0;

	virtual void setFloatRegSingle(int reg_idx, float val) = 0;

	virtual void setFloatRegDouble(int reg_idx, double val) = 0;

	virtual void setFloatRegInt(int reg_idx, uint64_t val) = 0;

	virtual uint64_t readPC() = 0;

	virtual void setPC(uint64_t val) = 0;

	virtual uint64_t readNextPC() = 0;

	virtual void setNextPC(uint64_t val) = 0;

	virtual MiscReg readMiscReg(int misc_reg) = 0;

	virtual MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault) = 0;

	virtual Fault setMiscReg(int misc_reg, const MiscReg &val) = 0;

	virtual Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val) = 0;

	// Also not necessarily the best location for these two. Hopefully will go
	// away once we decide upon where st cond failures goes.
	virtual unsigned readStCondFailures() = 0;

	virtual void setStCondFailures(unsigned sc_failures) = 0;

	#if FULL_SYSTEM
	virtual bool inPalMode() = 0;
	#endif

	// Only really makes sense for old CPU model. Still could be useful though.
	virtual bool misspeculating() = 0;

	#if !FULL_SYSTEM
	virtual IntReg getSyscallArg(int i) = 0;

	// used to shift args for indirect syscall
	virtual void setSyscallArg(int i, IntReg val) = 0;

	virtual void setSyscallReturn(SyscallReturn return_value) = 0;

	// virtual void syscall() = 0;

	// Same with st cond failures.
	virtual Counter readFuncExeInst() = 0;
	#endif
	};

	template <class XC>
	class ProxyExecContext : public ExecContext
	{
	public:
	ProxyExecContext(XC *actual_xc)
	{ actualXC = actual_xc; }

	private:
	XC *actualXC;

	public:

	BaseCPU *getCpuPtr() { return actualXC->getCpuPtr(); }

	void setCpuId(int id) { actualXC->setCpuId(id); }

	int readCpuId() { return actualXC->readCpuId(); }

	FunctionalMemory *getMemPtr() { return actualXC->getMemPtr(); }

	#if FULL_SYSTEM
	System *getSystemPtr() { return actualXC->getSystemPtr(); }

	PhysicalMemory *getPhysMemPtr() { return actualXC->getPhysMemPtr(); }

	AlphaITB *getITBPtr() { return actualXC->getITBPtr(); }

	AlphaDTB *getDTBPtr() { return actualXC->getDTBPtr(); }

	Kernel::Statistics *getKernelStats() { return actualXC->getKernelStats(); }
	#else
	Process *getProcessPtr() { return actualXC->getProcessPtr(); }
	#endif

	Status status() const { return actualXC->status(); }

	void setStatus(Status new_status) { actualXC->setStatus(new_status); }

	/// Set the status to Active. Optional delay indicates number of
	/// cycles to wait before beginning execution.
	void activate(int delay = 1) { actualXC->activate(delay); }

	/// Set the status to Suspended.
	void suspend() { actualXC->suspend(); }

	/// Set the status to Unallocated.
	void deallocate() { actualXC->deallocate(); }

	/// Set the status to Halted.
	void halt() { actualXC->halt(); }

	#if FULL_SYSTEM
	void dumpFuncProfile() { actualXC->dumpFuncProfile(); }
	#endif

	void takeOverFrom(ExecContext *oldContext)
	{ actualXC->takeOverFrom(oldContext); }

	void regStats(const std::string &name) { actualXC->regStats(name); }

	void serialize(std::ostream &os) { actualXC->serialize(os); }
	void unserialize(Checkpoint *cp, const std::string &section)
	{ actualXC->unserialize(cp, section); }

	#if FULL_SYSTEM
	EndQuiesceEvent *getQuiesceEvent() { return actualXC->getQuiesceEvent(); }

	Tick readLastActivate() { return actualXC->readLastActivate(); }
	Tick readLastSuspend() { return actualXC->readLastSuspend(); }

	void profileClear() { return actualXC->profileClear(); }
	void profileSample() { return actualXC->profileSample(); }
	#endif

	int getThreadNum() { return actualXC->getThreadNum(); }

	// @todo: Do I need this?
	MachInst getInst() { return actualXC->getInst(); }

	// @todo: Do I need this?
	void copyArchRegs(ExecContext *xc) { actualXC->copyArchRegs(xc); }

	void clearArchRegs() { actualXC->clearArchRegs(); }

	//
	// New accessors for new decoder.
	//
	uint64_t readIntReg(int reg_idx)
	{ return actualXC->readIntReg(reg_idx); }

	float readFloatRegSingle(int reg_idx)
	{ return actualXC->readFloatRegSingle(reg_idx); }

	double readFloatRegDouble(int reg_idx)
	{ return actualXC->readFloatRegDouble(reg_idx); }

	uint64_t readFloatRegInt(int reg_idx)
	{ return actualXC->readFloatRegInt(reg_idx); }

	void setIntReg(int reg_idx, uint64_t val)
	{ actualXC->setIntReg(reg_idx, val); }

	void setFloatRegSingle(int reg_idx, float val)
	{ actualXC->setFloatRegSingle(reg_idx, val); }

	void setFloatRegDouble(int reg_idx, double val)
	{ actualXC->setFloatRegDouble(reg_idx, val); }

	void setFloatRegInt(int reg_idx, uint64_t val)
	{ actualXC->setFloatRegInt(reg_idx, val); }

	uint64_t readPC() { return actualXC->readPC(); }

	void setPC(uint64_t val) { actualXC->setPC(val); }

	uint64_t readNextPC() { return actualXC->readNextPC(); }

	void setNextPC(uint64_t val) { actualXC->setNextPC(val); }

	MiscReg readMiscReg(int misc_reg)
	{ return actualXC->readMiscReg(misc_reg); }

	MiscReg readMiscRegWithEffect(int misc_reg, Fault &fault)
	{ return actualXC->readMiscRegWithEffect(misc_reg, fault); }

	Fault setMiscReg(int misc_reg, const MiscReg &val)
	{ return actualXC->setMiscReg(misc_reg, val); }

	Fault setMiscRegWithEffect(int misc_reg, const MiscReg &val)
	{ return actualXC->setMiscRegWithEffect(misc_reg, val); }

	unsigned readStCondFailures()
	{ return actualXC->readStCondFailures(); }

	void setStCondFailures(unsigned sc_failures)
	{ actualXC->setStCondFailures(sc_failures); }
	#if FULL_SYSTEM
	bool inPalMode() { return actualXC->inPalMode(); }
	#endif

	// @todo: Fix this!
	bool misspeculating() { return actualXC->misspeculating(); }

	#if !FULL_SYSTEM
	IntReg getSyscallArg(int i) { return actualXC->getSyscallArg(i); }

	// used to shift args for indirect syscall
	void setSyscallArg(int i, IntReg val)
	{ actualXC->setSyscallArg(i, val); }

	void setSyscallReturn(SyscallReturn return_value)
	{ actualXC->setSyscallReturn(return_value); }

	// void syscall() { actualXC->syscall(); }

	Counter readFuncExeInst() { return actualXC->readFuncExeInst(); }
	#endif
	};

	#endif