src/arch/arm/fastmodel/iris/thread_context.hh - public/gem5 - Git at Google

 /*
  * Copyright 2019 Google, Inc.
  *
  * 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_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__
 #define __ARCH_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__

 #include <list>
 #include <map>
 #include <memory>
 #include <unordered_map>

 #include "arch/arm/fastmodel/iris/memory_spaces.hh"
 #include "arch/arm/regs/vec.hh"
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
 #include "iris/IrisInstance.h"
 #include "iris/detail/IrisErrorCode.h"
 #include "iris/detail/IrisObjects.h"
 #include "sim/system.hh"

 namespace gem5
 {

 namespace Iris
 {

 // This class is the base for ThreadContexts which read and write state using
 // the Iris API.
 class ThreadContext : public gem5::ThreadContext
 {
   public:
     typedef std::map<std::string, iris::ResourceInfo> ResourceMap;

     typedef std::vector<iris::ResourceId> ResourceIds;
     typedef std::map<int, std::string> IdxNameMap;

     typedef std::unordered_map<Iris::CanonicalMsn, iris::MemorySpaceId>
         MemorySpaceMap;

   protected:
     gem5::BaseCPU *_cpu;
     int _threadId;
     ContextID _contextId;
     System *_system;
     gem5::BaseMMU *_mmu;
     gem5::BaseISA *_isa;

     std::string _irisPath;
     iris::InstanceId _instId = iris::IRIS_UINT64_MAX;

     // Temporary holding places for the vector reg accessors to return.
     // These are not updated live, only when requested.
     mutable std::vector<ArmISA::VecRegContainer> vecRegs;
     mutable std::vector<ArmISA::VecPredRegContainer> vecPredRegs;

     Status _status = Active;
     Event *enableAfterPseudoEvent;

     virtual void initFromIrisInstance(const ResourceMap &resources);

     iris::ResourceId extractResourceId(
             const ResourceMap &resources, const std::string &name);
     void extractResourceMap(ResourceIds &ids,
             const ResourceMap &resources, const IdxNameMap &idx_names);
     iris::MemorySpaceId getMemorySpaceId(const Iris::CanonicalMsn& msn) const;


     ResourceIds miscRegIds;
     ResourceIds intReg32Ids;
     ResourceIds intReg64Ids;
     ResourceIds flattenedIntIds;
     ResourceIds ccRegIds;

     iris::ResourceId pcRscId = iris::IRIS_UINT64_MAX;
     iris::ResourceId icountRscId;

     ResourceIds vecRegIds;
     ResourceIds vecPredRegIds;

     std::vector<iris::MemorySpaceInfo> memorySpaces;
     std::vector<iris::MemorySupportedAddressTranslationResult> translations;
     MemorySpaceMap memorySpaceIds;

     // A queue to keep track of instruction count based events.
     EventQueue comInstEventQueue;
     // A helper function to maintain the IRIS step count. This makes sure the
     // step count is correct even after IRIS resets it for us, and also handles
     // events which are supposed to happen at the current instruction count.
     void maintainStepping();


     using BpId = uint64_t;
     struct BpInfo
     {
         Addr pc;
         std::vector<BpId> ids;
         using EventList = std::list<PCEvent *>;
         std::shared_ptr<EventList> events;

         BpInfo(Addr _pc) : pc(_pc), events(new EventList) {}

         bool empty() const { return events->empty(); }
         bool validIds() const { return !ids.empty(); }
         void clearIds() { ids.clear(); }
     };

     using BpInfoPtr = std::unique_ptr<BpInfo>;
     using BpInfoMap = std::map<Addr, BpInfoPtr>;
     using BpInfoIt = BpInfoMap::iterator;

     BpInfoMap bps;

     BpInfoIt getOrAllocBp(Addr pc);

     void installBp(BpInfoIt it);
     void uninstallBp(BpInfoIt it);
     void delBp(BpInfoIt it);

     virtual const std::vector<iris::MemorySpaceId> &getBpSpaceIds() const = 0;


     iris::IrisErrorCode instanceRegistryChanged(
             uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
             uint64_t sInstId, bool syncEc, std::string &error_message_out);
     iris::IrisErrorCode phaseInitLeave(
             uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
             uint64_t sInstId, bool syncEc, std::string &error_message_out);
     iris::IrisErrorCode simulationTimeEvent(
             uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
             uint64_t sInstId, bool syncEc, std::string &error_message_out);
     iris::IrisErrorCode breakpointHit(
             uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
             uint64_t sInstId, bool syncEc, std::string &error_message_out);
     iris::IrisErrorCode semihostingEvent(
             uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
             uint64_t sInstId, bool syncEc, std::string &error_message_out);

     iris::EventStreamId regEventStreamId;
     iris::EventStreamId initEventStreamId;
     iris::EventStreamId timeEventStreamId;
     iris::EventStreamId breakpointEventStreamId;
     iris::EventStreamId semihostingEventStreamId;

     mutable iris::IrisInstance client;
     iris::IrisCppAdapter &call() const { return client.irisCall(); }
     iris::IrisCppAdapter &noThrow() const { return client.irisCallNoThrow(); }

     mutable ArmISA::PCState pc;

     void readMem(iris::MemorySpaceId space,
                  Addr addr, void *p, size_t size);
     void writeMem(iris::MemorySpaceId space,
                   Addr addr, const void *p, size_t size);
     bool translateAddress(Addr &paddr, iris::MemorySpaceId p_space,
                           Addr vaddr, iris::MemorySpaceId v_space);

   public:
     ThreadContext(gem5::BaseCPU *cpu, int id, System *system,
                   gem5::BaseMMU *mmu, gem5::BaseISA *isa,
                   iris::IrisConnectionInterface *iris_if,
                   const std::string &iris_path);
     virtual ~ThreadContext();

     virtual bool translateAddress(Addr &paddr, Addr vaddr) = 0;

     bool schedule(PCEvent *e) override;
     bool remove(PCEvent *e) override;

     void scheduleInstCountEvent(Event *event, Tick count) override;
     void descheduleInstCountEvent(Event *event) override;
     Tick getCurrentInstCount() override;

     gem5::BaseCPU *getCpuPtr() override { return _cpu; }
     int cpuId() const override { return _cpu->cpuId(); }
     uint32_t socketId() const override { return _cpu->socketId(); }

     int threadId() const override { return _threadId; }
     void setThreadId(int id) override { _threadId = id; }

     int contextId() const override { return _contextId; }
     void setContextId(int id) override { _contextId = id; }

     BaseMMU *
     getMMUPtr() override
     {
         return _mmu;
     }

     CheckerCPU *getCheckerCpuPtr() override { return nullptr; }
     InstDecoder *
     getDecoderPtr() override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     System *getSystemPtr() override { return _cpu->system; }

     BaseISA *
     getIsaPtr() override
     {
         return _isa;
     }

     void sendFunctional(PacketPtr pkt) override;

     Process *
     getProcessPtr() override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     void
     setProcessPtr(Process *p) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     Status status() const override;
     void setStatus(Status new_status) override;
     void activate() override { setStatus(Active); }
     void suspend() override { setStatus(Suspended); }
     void halt() override { setStatus(Halted); }

     void
     takeOverFrom(gem5::ThreadContext *old_context) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void regStats(const std::string &name) override {}

     // Not necessarily the best location for these...
     // Having an extra function just to read these is obnoxious
     Tick
     readLastActivate() override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     Tick readLastSuspend() override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     copyArchRegs(gem5::ThreadContext *tc) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     clearArchRegs() override
     {
         warn("Ignoring clearArchRegs()");
     }

     //
     // New accessors for new decoder.
     //
     RegVal readIntReg(RegIndex reg_idx) const override;

     RegVal
     readFloatReg(RegIndex reg_idx) const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     const ArmISA::VecRegContainer &readVecReg(const RegId &reg) const override;
     ArmISA::VecRegContainer &
     getWritableVecReg(const RegId &reg) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     RegVal
     readVecElem(const RegId &reg) const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     const ArmISA::VecPredRegContainer &
         readVecPredReg(const RegId &reg) const override;
     ArmISA::VecPredRegContainer &
     getWritableVecPredReg(const RegId &reg) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     RegVal
     readCCReg(RegIndex reg_idx) const override
     {
         return readCCRegFlat(reg_idx);
     }

     void setIntReg(RegIndex reg_idx, RegVal val) override;

     void
     setFloatReg(RegIndex reg_idx, RegVal val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setVecReg(const RegId &reg, const ArmISA::VecRegContainer &val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setVecElem(const RegId& reg, RegVal val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setVecPredReg(const RegId &reg,
                   const ArmISA::VecPredRegContainer &val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setCCReg(RegIndex reg_idx, RegVal val) override
     {
         setCCRegFlat(reg_idx, val);
     }

     void pcStateNoRecord(const PCStateBase &val) override { pcState(val); }

     const PCStateBase &pcState() const override;
     void pcState(const PCStateBase &val) override;

     RegVal readMiscRegNoEffect(RegIndex misc_reg) const override;
     RegVal
     readMiscReg(RegIndex misc_reg) override
     {
         return readMiscRegNoEffect(misc_reg);
     }

     void setMiscRegNoEffect(RegIndex misc_reg, const RegVal val) override;
     void
     setMiscReg(RegIndex misc_reg, const RegVal val) override
     {
         setMiscRegNoEffect(misc_reg, val);
     }

     RegId
     flattenRegId(const RegId& regId) const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     // Also not necessarily the best location for these two.  Hopefully will go
     // away once we decide upon where st cond failures goes.
     unsigned
     readStCondFailures() const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setStCondFailures(unsigned sc_failures) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     /** @{ */
     /**
      * Flat register interfaces
      *
      * Some architectures have different registers visible in
      * different modes. Such architectures "flatten" a register (see
      * flattenRegId()) to map it into the
      * gem5 register file. This interface provides a flat interface to
      * the underlying register file, which allows for example
      * serialization code to access all registers.
      */

     RegVal readIntRegFlat(RegIndex idx) const override;
     void setIntRegFlat(RegIndex idx, uint64_t val) override;

     RegVal
     readFloatRegFlat(RegIndex idx) const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     void
     setFloatRegFlat(RegIndex idx, RegVal val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     const ArmISA::VecRegContainer &readVecRegFlat(RegIndex idx) const override;
     ArmISA::VecRegContainer &
     getWritableVecRegFlat(RegIndex idx) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     void
     setVecRegFlat(RegIndex idx, const ArmISA::VecRegContainer &val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     RegVal
     readVecElemFlat(RegIndex idx, const ElemIndex& elemIdx) const override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     void
     setVecElemFlat(RegIndex idx, const ElemIndex &elemIdx, RegVal val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     const ArmISA::VecPredRegContainer &
         readVecPredRegFlat(RegIndex idx) const override;
     ArmISA::VecPredRegContainer &
     getWritableVecPredRegFlat(RegIndex idx) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
     void
     setVecPredRegFlat(RegIndex idx,
             const ArmISA::VecPredRegContainer &val) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     RegVal readCCRegFlat(RegIndex idx) const override;
     void setCCRegFlat(RegIndex idx, RegVal val) override;
     /** @} */

     // hardware transactional memory
     void
     htmAbortTransaction(uint64_t htm_uid, HtmFailureFaultCause cause) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     BaseHTMCheckpointPtr &
     getHtmCheckpointPtr() override
     {
         panic("%s not implemented.", __FUNCTION__);
     }

     void
     setHtmCheckpointPtr(BaseHTMCheckpointPtr cpt) override
     {
         panic("%s not implemented.", __FUNCTION__);
     }
 };

 } // namespace Iris
 } // namespace gem5

 #endif // __ARCH_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__
	/*
	* Copyright 2019 Google, Inc.
	*
	* 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_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__
	#define __ARCH_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__

	#include <list>
	#include <map>
	#include <memory>
	#include <unordered_map>

	#include "arch/arm/fastmodel/iris/memory_spaces.hh"
	#include "arch/arm/regs/vec.hh"
	#include "cpu/base.hh"
	#include "cpu/thread_context.hh"
	#include "iris/IrisInstance.h"
	#include "iris/detail/IrisErrorCode.h"
	#include "iris/detail/IrisObjects.h"
	#include "sim/system.hh"

	namespace gem5
	{

	namespace Iris
	{

	// This class is the base for ThreadContexts which read and write state using
	// the Iris API.
	class ThreadContext : public gem5::ThreadContext
	{
	public:
	typedef std::map<std::string, iris::ResourceInfo> ResourceMap;

	typedef std::vector<iris::ResourceId> ResourceIds;
	typedef std::map<int, std::string> IdxNameMap;

	typedef std::unordered_map<Iris::CanonicalMsn, iris::MemorySpaceId>
	MemorySpaceMap;

	protected:
	gem5::BaseCPU *_cpu;
	int _threadId;
	ContextID _contextId;
	System *_system;
	gem5::BaseMMU *_mmu;
	gem5::BaseISA *_isa;

	std::string _irisPath;
	iris::InstanceId _instId = iris::IRIS_UINT64_MAX;

	// Temporary holding places for the vector reg accessors to return.
	// These are not updated live, only when requested.
	mutable std::vector<ArmISA::VecRegContainer> vecRegs;
	mutable std::vector<ArmISA::VecPredRegContainer> vecPredRegs;

	Status _status = Active;
	Event *enableAfterPseudoEvent;

	virtual void initFromIrisInstance(const ResourceMap &resources);

	iris::ResourceId extractResourceId(
	const ResourceMap &resources, const std::string &name);
	void extractResourceMap(ResourceIds &ids,
	const ResourceMap &resources, const IdxNameMap &idx_names);
	iris::MemorySpaceId getMemorySpaceId(const Iris::CanonicalMsn& msn) const;


	ResourceIds miscRegIds;
	ResourceIds intReg32Ids;
	ResourceIds intReg64Ids;
	ResourceIds flattenedIntIds;
	ResourceIds ccRegIds;

	iris::ResourceId pcRscId = iris::IRIS_UINT64_MAX;
	iris::ResourceId icountRscId;

	ResourceIds vecRegIds;
	ResourceIds vecPredRegIds;

	std::vector<iris::MemorySpaceInfo> memorySpaces;
	std::vector<iris::MemorySupportedAddressTranslationResult> translations;
	MemorySpaceMap memorySpaceIds;

	// A queue to keep track of instruction count based events.
	EventQueue comInstEventQueue;
	// A helper function to maintain the IRIS step count. This makes sure the
	// step count is correct even after IRIS resets it for us, and also handles
	// events which are supposed to happen at the current instruction count.
	void maintainStepping();


	using BpId = uint64_t;
	struct BpInfo
	{
	Addr pc;
	std::vector<BpId> ids;
	using EventList = std::list<PCEvent *>;
	std::shared_ptr<EventList> events;

	BpInfo(Addr _pc) : pc(_pc), events(new EventList) {}

	bool empty() const { return events->empty(); }
	bool validIds() const { return !ids.empty(); }
	void clearIds() { ids.clear(); }
	};

	using BpInfoPtr = std::unique_ptr<BpInfo>;
	using BpInfoMap = std::map<Addr, BpInfoPtr>;
	using BpInfoIt = BpInfoMap::iterator;

	BpInfoMap bps;

	BpInfoIt getOrAllocBp(Addr pc);

	void installBp(BpInfoIt it);
	void uninstallBp(BpInfoIt it);
	void delBp(BpInfoIt it);

	virtual const std::vector<iris::MemorySpaceId> &getBpSpaceIds() const = 0;


	iris::IrisErrorCode instanceRegistryChanged(
	uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
	uint64_t sInstId, bool syncEc, std::string &error_message_out);
	iris::IrisErrorCode phaseInitLeave(
	uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
	uint64_t sInstId, bool syncEc, std::string &error_message_out);
	iris::IrisErrorCode simulationTimeEvent(
	uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
	uint64_t sInstId, bool syncEc, std::string &error_message_out);
	iris::IrisErrorCode breakpointHit(
	uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
	uint64_t sInstId, bool syncEc, std::string &error_message_out);
	iris::IrisErrorCode semihostingEvent(
	uint64_t esId, const iris::IrisValueMap &fields, uint64_t time,
	uint64_t sInstId, bool syncEc, std::string &error_message_out);

	iris::EventStreamId regEventStreamId;
	iris::EventStreamId initEventStreamId;
	iris::EventStreamId timeEventStreamId;
	iris::EventStreamId breakpointEventStreamId;
	iris::EventStreamId semihostingEventStreamId;

	mutable iris::IrisInstance client;
	iris::IrisCppAdapter &call() const { return client.irisCall(); }
	iris::IrisCppAdapter &noThrow() const { return client.irisCallNoThrow(); }

	mutable ArmISA::PCState pc;

	void readMem(iris::MemorySpaceId space,
	Addr addr, void *p, size_t size);
	void writeMem(iris::MemorySpaceId space,
	Addr addr, const void *p, size_t size);
	bool translateAddress(Addr &paddr, iris::MemorySpaceId p_space,
	Addr vaddr, iris::MemorySpaceId v_space);

	public:
	ThreadContext(gem5::BaseCPU cpu, int id, System system,
	gem5::BaseMMU mmu, gem5::BaseISA isa,
	iris::IrisConnectionInterface *iris_if,
	const std::string &iris_path);
	virtual ~ThreadContext();

	virtual bool translateAddress(Addr &paddr, Addr vaddr) = 0;

	bool schedule(PCEvent *e) override;
	bool remove(PCEvent *e) override;

	void scheduleInstCountEvent(Event *event, Tick count) override;
	void descheduleInstCountEvent(Event *event) override;
	Tick getCurrentInstCount() override;

	gem5::BaseCPU *getCpuPtr() override { return _cpu; }
	int cpuId() const override { return _cpu->cpuId(); }
	uint32_t socketId() const override { return _cpu->socketId(); }

	int threadId() const override { return _threadId; }
	void setThreadId(int id) override { _threadId = id; }

	int contextId() const override { return _contextId; }
	void setContextId(int id) override { _contextId = id; }

	BaseMMU *
	getMMUPtr() override
	{
	return _mmu;
	}

	CheckerCPU *getCheckerCpuPtr() override { return nullptr; }
	InstDecoder *
	getDecoderPtr() override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	System *getSystemPtr() override { return _cpu->system; }

	BaseISA *
	getIsaPtr() override
	{
	return _isa;
	}

	void sendFunctional(PacketPtr pkt) override;

	Process *
	getProcessPtr() override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	void
	setProcessPtr(Process *p) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	Status status() const override;
	void setStatus(Status new_status) override;
	void activate() override { setStatus(Active); }
	void suspend() override { setStatus(Suspended); }
	void halt() override { setStatus(Halted); }

	void
	takeOverFrom(gem5::ThreadContext *old_context) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void regStats(const std::string &name) override {}

	// Not necessarily the best location for these...
	// Having an extra function just to read these is obnoxious
	Tick
	readLastActivate() override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	Tick readLastSuspend() override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	copyArchRegs(gem5::ThreadContext *tc) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	clearArchRegs() override
	{
	warn("Ignoring clearArchRegs()");
	}

	//
	// New accessors for new decoder.
	//
	RegVal readIntReg(RegIndex reg_idx) const override;

	RegVal
	readFloatReg(RegIndex reg_idx) const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	const ArmISA::VecRegContainer &readVecReg(const RegId &reg) const override;
	ArmISA::VecRegContainer &
	getWritableVecReg(const RegId &reg) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	RegVal
	readVecElem(const RegId &reg) const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	const ArmISA::VecPredRegContainer &
	readVecPredReg(const RegId &reg) const override;
	ArmISA::VecPredRegContainer &
	getWritableVecPredReg(const RegId &reg) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	RegVal
	readCCReg(RegIndex reg_idx) const override
	{
	return readCCRegFlat(reg_idx);
	}

	void setIntReg(RegIndex reg_idx, RegVal val) override;

	void
	setFloatReg(RegIndex reg_idx, RegVal val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setVecReg(const RegId &reg, const ArmISA::VecRegContainer &val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setVecElem(const RegId& reg, RegVal val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setVecPredReg(const RegId &reg,
	const ArmISA::VecPredRegContainer &val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setCCReg(RegIndex reg_idx, RegVal val) override
	{
	setCCRegFlat(reg_idx, val);
	}

	void pcStateNoRecord(const PCStateBase &val) override { pcState(val); }

	const PCStateBase &pcState() const override;
	void pcState(const PCStateBase &val) override;

	RegVal readMiscRegNoEffect(RegIndex misc_reg) const override;
	RegVal
	readMiscReg(RegIndex misc_reg) override
	{
	return readMiscRegNoEffect(misc_reg);
	}

	void setMiscRegNoEffect(RegIndex misc_reg, const RegVal val) override;
	void
	setMiscReg(RegIndex misc_reg, const RegVal val) override
	{
	setMiscRegNoEffect(misc_reg, val);
	}

	RegId
	flattenRegId(const RegId& regId) const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	// Also not necessarily the best location for these two. Hopefully will go
	// away once we decide upon where st cond failures goes.
	unsigned
	readStCondFailures() const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setStCondFailures(unsigned sc_failures) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	/** @{ */
	/**
	* Flat register interfaces
	*
	* Some architectures have different registers visible in
	* different modes. Such architectures "flatten" a register (see
	* flattenRegId()) to map it into the
	* gem5 register file. This interface provides a flat interface to
	* the underlying register file, which allows for example
	* serialization code to access all registers.
	*/

	RegVal readIntRegFlat(RegIndex idx) const override;
	void setIntRegFlat(RegIndex idx, uint64_t val) override;

	RegVal
	readFloatRegFlat(RegIndex idx) const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	void
	setFloatRegFlat(RegIndex idx, RegVal val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	const ArmISA::VecRegContainer &readVecRegFlat(RegIndex idx) const override;
	ArmISA::VecRegContainer &
	getWritableVecRegFlat(RegIndex idx) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	void
	setVecRegFlat(RegIndex idx, const ArmISA::VecRegContainer &val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	RegVal
	readVecElemFlat(RegIndex idx, const ElemIndex& elemIdx) const override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	void
	setVecElemFlat(RegIndex idx, const ElemIndex &elemIdx, RegVal val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	const ArmISA::VecPredRegContainer &
	readVecPredRegFlat(RegIndex idx) const override;
	ArmISA::VecPredRegContainer &
	getWritableVecPredRegFlat(RegIndex idx) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	void
	setVecPredRegFlat(RegIndex idx,
	const ArmISA::VecPredRegContainer &val) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	RegVal readCCRegFlat(RegIndex idx) const override;
	void setCCRegFlat(RegIndex idx, RegVal val) override;
	/** @} */

	// hardware transactional memory
	void
	htmAbortTransaction(uint64_t htm_uid, HtmFailureFaultCause cause) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	BaseHTMCheckpointPtr &
	getHtmCheckpointPtr() override
	{
	panic("%s not implemented.", __FUNCTION__);
	}

	void
	setHtmCheckpointPtr(BaseHTMCheckpointPtr cpt) override
	{
	panic("%s not implemented.", __FUNCTION__);
	}
	};

	} // namespace Iris
	} // namespace gem5

	#endif // __ARCH_ARM_FASTMODEL_IRIS_THREAD_CONTEXT_HH__