thread_context.hh

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/*
 * Copyright (c) 2011-2012, 2016-2018 ARM Limited
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * All rights reserved
 *
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 * 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
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2006 The Regents of The University of Michigan
 * All rights reserved.
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 * 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;
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 * Authors: Kevin Lim
 */

#ifndef __CPU_THREAD_CONTEXT_HH__
#define __CPU_THREAD_CONTEXT_HH__

#include <iostream>
#include <string>

#include "arch/generic/isa.hh"
#include "arch/registers.hh"
#include "arch/types.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/pc_event.hh"
#include "cpu/reg_class.hh"

// @todo: Figure out a more architecture independent way to obtain the ITB and
// DTB pointers.
namespace TheISA
{
    class ISA;
    class Decoder;
}
class BaseCPU;
class BaseTLB;
class CheckerCPU;
class Checkpoint;
class EndQuiesceEvent;
class PortProxy;
class Process;
class System;
namespace Kernel {
    class Statistics;
}

class ThreadContext : public PCEventScope
{
  protected:
    typedef TheISA::MachInst MachInst;
    using VecRegContainer = TheISA::VecRegContainer;
    using VecElem = TheISA::VecElem;
    using VecPredRegContainer = TheISA::VecPredRegContainer;

  public:

    enum Status
    {
        Active,

        Suspended,

        Halting,

        Halted
    };

    virtual ~ThreadContext() { };

    virtual BaseCPU *getCpuPtr() = 0;

    virtual int cpuId() const = 0;

    virtual uint32_t socketId() const = 0;

    virtual int threadId() const = 0;

    virtual void setThreadId(int id) = 0;

    virtual ContextID contextId() const = 0;

    virtual void setContextId(ContextID id) = 0;

    virtual BaseTLB *getITBPtr() = 0;

    virtual BaseTLB *getDTBPtr() = 0;

    virtual CheckerCPU *getCheckerCpuPtr() = 0;

    virtual BaseISA *getIsaPtr() = 0;

    virtual TheISA::Decoder *getDecoderPtr() = 0;

    virtual System *getSystemPtr() = 0;

    virtual ::Kernel::Statistics *getKernelStats() = 0;

    virtual PortProxy &getPhysProxy() = 0;

    virtual PortProxy &getVirtProxy() = 0;

    virtual void initMemProxies(ThreadContext *tc) = 0;

    virtual Process *getProcessPtr() = 0;

    virtual void setProcessPtr(Process *p) = 0;

    virtual Status status() const = 0;

    virtual void setStatus(Status new_status) = 0;

    virtual void activate() = 0;

    virtual void suspend() = 0;

    virtual void halt() = 0;

    void quiesce();

    void quiesceTick(Tick resume);

    virtual void dumpFuncProfile() = 0;

    virtual void takeOverFrom(ThreadContext *old_context) = 0;

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

    virtual EndQuiesceEvent *getQuiesceEvent() = 0;

    virtual void scheduleInstCountEvent(Event *event, Tick count) = 0;
    virtual void descheduleInstCountEvent(Event *event) = 0;
    virtual Tick getCurrentInstCount() = 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;

    virtual void copyArchRegs(ThreadContext *tc) = 0;

    virtual void clearArchRegs() = 0;

    //
    // New accessors for new decoder.
    //
    virtual RegVal readIntReg(RegIndex reg_idx) const = 0;

    virtual RegVal readFloatReg(RegIndex reg_idx) const = 0;

    virtual const VecRegContainer& readVecReg(const RegId& reg) const = 0;
    virtual VecRegContainer& getWritableVecReg(const RegId& reg) = 0;

    virtual ConstVecLane8
    readVec8BitLaneReg(const RegId& reg) const = 0;

    virtual ConstVecLane16
    readVec16BitLaneReg(const RegId& reg) const = 0;

    virtual ConstVecLane32
    readVec32BitLaneReg(const RegId& reg) const = 0;

    virtual ConstVecLane64
    readVec64BitLaneReg(const RegId& reg) const = 0;

    virtual void setVecLane(const RegId& reg,
            const LaneData<LaneSize::Byte>& val) = 0;
    virtual void setVecLane(const RegId& reg,
            const LaneData<LaneSize::TwoByte>& val) = 0;
    virtual void setVecLane(const RegId& reg,
            const LaneData<LaneSize::FourByte>& val) = 0;
    virtual void setVecLane(const RegId& reg,
            const LaneData<LaneSize::EightByte>& val) = 0;
    virtual const VecElem& readVecElem(const RegId& reg) const = 0;

    virtual const VecPredRegContainer& readVecPredReg(const RegId& reg)
        const = 0;
    virtual VecPredRegContainer& getWritableVecPredReg(const RegId& reg) = 0;

    virtual RegVal readCCReg(RegIndex reg_idx) const = 0;

    virtual void setIntReg(RegIndex reg_idx, RegVal val) = 0;

    virtual void setFloatReg(RegIndex reg_idx, RegVal val) = 0;

    virtual void setVecReg(const RegId& reg, const VecRegContainer& val) = 0;

    virtual void setVecElem(const RegId& reg, const VecElem& val) = 0;

    virtual void setVecPredReg(const RegId& reg,
                               const VecPredRegContainer& val) = 0;

    virtual void setCCReg(RegIndex reg_idx, RegVal val) = 0;

    virtual TheISA::PCState pcState() const = 0;

    virtual void pcState(const TheISA::PCState &val) = 0;

    void
    setNPC(Addr val)
    {
        TheISA::PCState pc_state = pcState();
        pc_state.setNPC(val);
        pcState(pc_state);
    }

    virtual void pcStateNoRecord(const TheISA::PCState &val) = 0;

    virtual Addr instAddr() const = 0;

    virtual Addr nextInstAddr() const = 0;

    virtual MicroPC microPC() const = 0;

    virtual RegVal readMiscRegNoEffect(RegIndex misc_reg) const = 0;

    virtual RegVal readMiscReg(RegIndex misc_reg) = 0;

    virtual void setMiscRegNoEffect(RegIndex misc_reg, RegVal val) = 0;

    virtual void setMiscReg(RegIndex misc_reg, RegVal val) = 0;

    virtual RegId flattenRegId(const RegId& regId) const = 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() const = 0;

    virtual void setStCondFailures(unsigned sc_failures) = 0;

    // Same with st cond failures.
    virtual Counter readFuncExeInst() const = 0;

    virtual void syscall(Fault *fault) = 0;

    // This function exits the thread context in the CPU and returns
    // 1 if the CPU has no more active threads (meaning it's OK to exit);
    // Used in syscall-emulation mode when a  thread calls the exit syscall.
    virtual int exit() { return 1; };

    static void compare(ThreadContext *one, ThreadContext *two);

    virtual RegVal readIntRegFlat(RegIndex idx) const = 0;
    virtual void setIntRegFlat(RegIndex idx, RegVal val) = 0;

    virtual RegVal readFloatRegFlat(RegIndex idx) const = 0;
    virtual void setFloatRegFlat(RegIndex idx, RegVal val) = 0;

    virtual const VecRegContainer& readVecRegFlat(RegIndex idx) const = 0;
    virtual VecRegContainer& getWritableVecRegFlat(RegIndex idx) = 0;
    virtual void setVecRegFlat(RegIndex idx, const VecRegContainer& val) = 0;

    virtual const VecElem& readVecElemFlat(RegIndex idx,
                                           const ElemIndex& elemIdx) const = 0;
    virtual void setVecElemFlat(RegIndex idx, const ElemIndex& elemIdx,
                                const VecElem& val) = 0;

    virtual const VecPredRegContainer &
        readVecPredRegFlat(RegIndex idx) const = 0;
    virtual VecPredRegContainer& getWritableVecPredRegFlat(RegIndex idx) = 0;
    virtual void setVecPredRegFlat(RegIndex idx,
                                   const VecPredRegContainer& val) = 0;

    virtual RegVal readCCRegFlat(RegIndex idx) const = 0;
    virtual void setCCRegFlat(RegIndex idx, RegVal val) = 0;
};

void serialize(const ThreadContext &tc, CheckpointOut &cp);
void unserialize(ThreadContext &tc, CheckpointIn &cp);

void takeOverFrom(ThreadContext &new_tc, ThreadContext &old_tc);

#endif