069b38c0d5
when threads are switching in/out the CPU, we need to keep track of special cases like branches. Add appropriate variables in ThreadState t track this and then use these variables when updating pc after context switch
119 lines
4 KiB
C++
119 lines
4 KiB
C++
/*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Kevin Lim
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*/
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#ifndef __CPU_INORDER_THREAD_STATE_HH__
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#define __CPU_INORDER_THREAD_STATE_HH__
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#include "arch/faults.hh"
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#include "arch/isa_traits.hh"
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#include "base/callback.hh"
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#include "base/output.hh"
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#include "cpu/thread_context.hh"
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#include "cpu/thread_state.hh"
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#include "sim/sim_exit.hh"
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class Event;
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class InOrderCPU;
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#if FULL_SYSTEM
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class EndQuiesceEvent;
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class FunctionProfile;
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class ProfileNode;
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#else
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class FunctionalMemory;
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class Process;
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#endif
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/**
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* Class that has various thread state, such as the status, the
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* current instruction being processed, whether or not the thread has
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* a trap pending or is being externally updated, the ThreadContext
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* pointer, etc. It also handles anything related to a specific
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* thread's process, such as syscalls and checking valid addresses.
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*/
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class InOrderThreadState : public ThreadState {
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typedef ThreadContext::Status Status;
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private:
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/** Pointer to the CPU. */
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InOrderCPU *cpu;
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public:
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/** Whether or not the thread is currently in syscall mode, and
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* thus able to be externally updated without squashing.
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*/
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bool inSyscall;
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/** Whether or not the thread is currently waiting on a trap, and
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* thus able to be externally updated without squashing.
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*/
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bool trapPending;
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#if FULL_SYSTEM
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InOrderThreadState(InOrderCPU *_cpu, ThreadID _thread_num)
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: ThreadState(reinterpret_cast<BaseCPU*>(_cpu), _thread_num),
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cpu(_cpu), inSyscall(0), trapPending(0), lastGradIsBranch(false)
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{ }
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#else
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InOrderThreadState(InOrderCPU *_cpu, ThreadID _thread_num,
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Process *_process)
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: ThreadState(reinterpret_cast<BaseCPU*>(_cpu), _thread_num,
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_process),
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cpu(_cpu), inSyscall(0), trapPending(0), lastGradIsBranch(false)
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{ }
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#endif
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#if !FULL_SYSTEM
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/** Handles the syscall. */
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void syscall(int64_t callnum) { process->syscall(callnum, tc); }
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#endif
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#if FULL_SYSTEM
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void dumpFuncProfile();
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#endif
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/** Pointer to the ThreadContext of this thread. */
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ThreadContext *tc;
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/** Returns a pointer to the TC of this thread. */
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ThreadContext *getTC() { return tc; }
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/** Return the thread id */
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int readTid() { return threadId(); }
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/** Is last instruction graduated a branch? */
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bool lastGradIsBranch;
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Addr lastBranchPC;
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Addr lastBranchNextPC;
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Addr lastBranchNextNPC;
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};
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#endif // __CPU_INORDER_THREAD_STATE_HH__
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