src/cpu/thread_context.hh

/*
 * 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;

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;
#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(); }
#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