gem5/src/cpu/o3/thread_state.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_O3_THREAD_STATE_HH__
#define __CPU_O3_THREAD_STATE_HH__

#include "arch/faults.hh"
#include "arch/isa_traits.hh"
#include "cpu/exec_context.hh"
#include "cpu/thread_state.hh"

class Event;
class Process;

#if FULL_SYSTEM
class EndQuiesceEvent;
class FunctionProfile;
class ProfileNode;
#else
class FunctionalMemory;
class Process;
#endif

/**
 * Class that has various thread state, such as the status, the
 * current instruction being processed, whether or not the thread has
 * a trap pending or is being externally updated, the ExecContext
 * proxy pointer, etc.  It also handles anything related to a specific
 * thread's process, such as syscalls and checking valid addresses.
 */
template <class Impl>
struct O3ThreadState : public ThreadState {
    typedef ExecContext::Status Status;
    typedef typename Impl::FullCPU FullCPU;

    /** Current status of the thread. */
    Status _status;

    /** Current instruction the thread is committing.  Only set and
     * used for DTB faults currently.
     */
    TheISA::MachInst inst;

  private:
    /** Pointer to the CPU. */
    FullCPU *cpu;
  public:
    /** Whether or not the thread is currently in syscall mode, and
     * thus able to be externally updated without squashing.
     */
    bool inSyscall;

    /** Whether or not the thread is currently waiting on a trap, and
     * thus able to be externally updated without squashing.
     */
    bool trapPending;

#if FULL_SYSTEM
    O3ThreadState(FullCPU *_cpu, int _thread_num, FunctionalMemory *_mem)
        : ThreadState(-1, _thread_num, _mem),
          inSyscall(0), trapPending(0)
    { }
#else
    O3ThreadState(FullCPU *_cpu, int _thread_num, Process *_process, int _asid)
        : ThreadState(-1, _thread_num, NULL, _process, _asid),
          cpu(_cpu), inSyscall(0), trapPending(0)
    { }

    O3ThreadState(FullCPU *_cpu, int _thread_num, FunctionalMemory *_mem,
                  int _asid)
        : ThreadState(-1, _thread_num, _mem, NULL, _asid),
          cpu(_cpu), inSyscall(0), trapPending(0)
    { }
#endif

    /** Pointer to the ExecContext of this thread.  @todo: Don't call
     this a proxy.*/
    ExecContext *xcProxy;

    /** Returns a pointer to the XC of this thread. */
    ExecContext *getXCProxy() { return xcProxy; }

    /** Returns the status of this thread. */
    Status status() const { return _status; }

    /** Sets the status of this thread. */
    void setStatus(Status new_status) { _status = new_status; }

    /** Sets the current instruction being committed. */
    void setInst(TheISA::MachInst _inst) { inst = _inst; }

    /** Reads the number of instructions functionally executed and
     * committed.
     */
    Counter readFuncExeInst() { return funcExeInst; }

    /** Sets the total number of instructions functionally executed
     * and committed.
     */
    void setFuncExeInst(Counter new_val) { funcExeInst = new_val; }

#if !FULL_SYSTEM
    /** Handles the syscall. */
    void syscall(int64_t callnum) { process->syscall(callnum, xcProxy); }
#endif
};

#endif // __CPU_O3_THREAD_STATE_HH__