5146a69835
isSyscall was originally created because during handling of a syscall in SE mode the threadcontext had to be updated. However, in many places this is used in FS mode (e.g. fault handlers) and the name doesn't make much sense. The boolean actually stops gem5 from squashing speculative and non-committed state when a write to a threadcontext happens, so re-name the variable to something more appropriate
104 lines
3.9 KiB
C++
104 lines
3.9 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/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 EndQuiesceEvent;
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class Event;
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class FunctionalMemory;
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class FunctionProfile;
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class InOrderCPU;
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class Process;
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class ProfileNode;
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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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/* This variable controls if writes to a thread context should cause a all
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* dynamic/speculative state to be thrown away. Nominally this is the
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* desired behavior because the external thread context write has updated
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* some state that could be used by an inflight instruction, however there
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* are some cases like in a fault/trap handler where this behavior would
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* lead to successive restarts and forward progress couldn't be made. This
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* variable controls if the squashing will occur.
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*/
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bool noSquashFromTC;
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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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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), noSquashFromTC(false), trapPending(false),
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lastGradIsBranch(false)
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{ }
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/** Handles the syscall. */
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void syscall(int64_t callnum) { process->syscall(callnum, tc); }
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void dumpFuncProfile();
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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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/** Is last instruction graduated a branch? */
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bool lastGradIsBranch;
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TheISA::PCState lastBranchPC;
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};
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#endif // __CPU_INORDER_THREAD_STATE_HH__
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