src/cpu/inorder/thread_state.hh

   1 /*
   2  * Copyright (c) 2006 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Kevin Lim
  29  */
  30
  31 #ifndef __CPU_INORDER_THREAD_STATE_HH__
  32 #define __CPU_INORDER_THREAD_STATE_HH__
  33
  34 #include "arch/isa_traits.hh"
  35 #include "base/callback.hh"
  36 #include "base/output.hh"
  37 #include "cpu/thread_context.hh"
  38 #include "cpu/thread_state.hh"
  39 #include "sim/sim_exit.hh"
  40
  41 class EndQuiesceEvent;
  42 class Event;
  43 class FunctionalMemory;
  44 class FunctionProfile;
  45 class InOrderCPU;
  46 class Process;
  47 class ProfileNode;
  48
  49 /**
  50  * Class that has various thread state, such as the status, the
  51  * current instruction being processed, whether or not the thread has
  52  * a trap pending or is being externally updated, the ThreadContext
  53  * pointer, etc.  It also handles anything related to a specific
  54  * thread's process, such as syscalls and checking valid addresses.
  55  */
  56 class InOrderThreadState : public ThreadState {
  57     typedef ThreadContext::Status Status;
  58
  59   private:
  60     /** Pointer to the CPU. */
  61     InOrderCPU *cpu;
  62
  63   public:
  64     /* This variable controls if writes to a thread context should cause a all
  65      * dynamic/speculative state to be thrown away. Nominally this is the
  66      * desired behavior because the external thread context write has updated
  67      * some state that could be used by an inflight instruction, however there
  68      * are some cases like in a fault/trap handler where this behavior would
  69      * lead to successive restarts and forward progress couldn't be made. This
  70      * variable controls if the squashing will occur.
  71      */
  72     bool noSquashFromTC;
  73
  74     /** Whether or not the thread is currently waiting on a trap, and
  75      * thus able to be externally updated without squashing.
  76      */
  77     bool trapPending;
  78
  79     InOrderThreadState(InOrderCPU *_cpu, ThreadID _thread_num,
  80                        Process *_process)
  81         : ThreadState(reinterpret_cast<BaseCPU*>(_cpu), _thread_num,
  82                       _process),
  83           cpu(_cpu), noSquashFromTC(false), trapPending(false),
  84           lastGradIsBranch(false)
  85     { }
  86
  87     /** Handles the syscall. */
  88     void syscall(int64_t callnum) { process->syscall(callnum, tc); }
  89
  90     void dumpFuncProfile();
  91
  92     /** Pointer to the ThreadContext of this thread. */
  93     ThreadContext *tc;
  94
  95     /** Returns a pointer to the TC of this thread. */
  96     ThreadContext *getTC() { return tc; }
  97
  98     /** Is last instruction graduated a branch? */
  99     bool lastGradIsBranch;
 100     TheISA::PCState lastBranchPC;
 101 };
 102
 103 #endif // __CPU_INORDER_THREAD_STATE_HH__