10c2e37f60
In FS mode the syscall function will panic, but the interface will be consistent and code which calls syscall can be compiled in. This will allow, for instance, instructions that use syscall to be built unconditionally but then not returned by the decoder.
212 lines
6.8 KiB
C++
212 lines
6.8 KiB
C++
/*
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* Copyright (c) 2010 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2004-2006 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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#include "base/cp_annotate.hh"
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#include "cpu/o3/dyn_inst.hh"
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template <class Impl>
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BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr staticInst,
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StaticInstPtr macroop,
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TheISA::PCState pc, TheISA::PCState predPC,
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InstSeqNum seq_num, O3CPU *cpu)
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: BaseDynInst<Impl>(staticInst, macroop, pc, predPC, seq_num, cpu)
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{
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initVars();
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}
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template <class Impl>
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BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr _staticInst,
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StaticInstPtr _macroop)
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: BaseDynInst<Impl>(_staticInst, _macroop)
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{
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initVars();
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}
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template <class Impl>
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void
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BaseO3DynInst<Impl>::initVars()
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{
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// Make sure to have the renamed register entries set to the same
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// as the normal register entries. It will allow the IQ to work
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// without any modifications.
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for (int i = 0; i < this->staticInst->numDestRegs(); i++) {
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this->_destRegIdx[i] = this->staticInst->destRegIdx(i);
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}
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for (int i = 0; i < this->staticInst->numSrcRegs(); i++) {
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this->_srcRegIdx[i] = this->staticInst->srcRegIdx(i);
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this->_readySrcRegIdx[i] = 0;
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}
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_numDestMiscRegs = 0;
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#if TRACING_ON
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fetchTick = 0;
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decodeTick = 0;
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renameTick = 0;
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dispatchTick = 0;
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issueTick = 0;
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completeTick = 0;
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#endif
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}
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template <class Impl>
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Fault
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BaseO3DynInst<Impl>::execute()
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{
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// @todo: Pretty convoluted way to avoid squashing from happening
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// when using the TC during an instruction's execution
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// (specifically for instructions that have side-effects that use
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// the TC). Fix this.
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bool in_syscall = this->thread->inSyscall;
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this->thread->inSyscall = true;
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this->fault = this->staticInst->execute(this, this->traceData);
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this->thread->inSyscall = in_syscall;
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return this->fault;
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}
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template <class Impl>
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Fault
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BaseO3DynInst<Impl>::initiateAcc()
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{
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// @todo: Pretty convoluted way to avoid squashing from happening
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// when using the TC during an instruction's execution
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// (specifically for instructions that have side-effects that use
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// the TC). Fix this.
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bool in_syscall = this->thread->inSyscall;
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this->thread->inSyscall = true;
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this->fault = this->staticInst->initiateAcc(this, this->traceData);
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this->thread->inSyscall = in_syscall;
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return this->fault;
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}
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template <class Impl>
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Fault
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BaseO3DynInst<Impl>::completeAcc(PacketPtr pkt)
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{
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// @todo: Pretty convoluted way to avoid squashing from happening
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// when using the TC during an instruction's execution
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// (specifically for instructions that have side-effects that use
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// the TC). Fix this.
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bool in_syscall = this->thread->inSyscall;
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this->thread->inSyscall = true;
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this->fault = this->staticInst->completeAcc(pkt, this, this->traceData);
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this->thread->inSyscall = in_syscall;
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return this->fault;
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}
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#if FULL_SYSTEM
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template <class Impl>
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Fault
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BaseO3DynInst<Impl>::hwrei()
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{
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#if THE_ISA == ALPHA_ISA
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// Can only do a hwrei when in pal mode.
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if (!(this->instAddr() & 0x3))
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return new AlphaISA::UnimplementedOpcodeFault;
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// Set the next PC based on the value of the EXC_ADDR IPR.
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AlphaISA::PCState pc = this->pcState();
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pc.npc(this->cpu->readMiscRegNoEffect(AlphaISA::IPR_EXC_ADDR,
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this->threadNumber));
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this->pcState(pc);
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if (CPA::available()) {
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ThreadContext *tc = this->cpu->tcBase(this->threadNumber);
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CPA::cpa()->swAutoBegin(tc, this->nextInstAddr());
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}
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// Tell CPU to clear any state it needs to if a hwrei is taken.
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this->cpu->hwrei(this->threadNumber);
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#else
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#endif
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// FIXME: XXX check for interrupts? XXX
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return NoFault;
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}
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template <class Impl>
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void
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BaseO3DynInst<Impl>::trap(Fault fault)
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{
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this->cpu->trap(fault, this->threadNumber, this->staticInst);
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}
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template <class Impl>
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bool
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BaseO3DynInst<Impl>::simPalCheck(int palFunc)
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{
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#if THE_ISA != ALPHA_ISA
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panic("simPalCheck called, but PAL only exists in Alpha!\n");
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#endif
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return this->cpu->simPalCheck(palFunc, this->threadNumber);
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}
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#endif
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template <class Impl>
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void
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BaseO3DynInst<Impl>::syscall(int64_t callnum)
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{
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#if FULL_SYSTEM
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panic("Syscall emulation isn't available in FS mode.\n");
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#else
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// HACK: check CPU's nextPC before and after syscall. If it
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// changes, update this instruction's nextPC because the syscall
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// must have changed the nextPC.
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TheISA::PCState curPC = this->cpu->pcState(this->threadNumber);
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this->cpu->syscall(callnum, this->threadNumber);
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TheISA::PCState newPC = this->cpu->pcState(this->threadNumber);
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if (!(curPC == newPC)) {
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this->pcState(newPC);
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}
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#endif
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}
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