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/*
* Copyright (c) 2010, 2016 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2004-2006 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.
*
* Authors: Kevin Lim
*/
#ifndef __CPU_O3_DYN_INST_HH__
#define __CPU_O3_DYN_INST_HH__
#include <array>
#include "arch/isa_traits.hh"
#include "config/the_isa.hh"
#include "cpu/o3/cpu.hh"
#include "cpu/o3/isa_specific.hh"
#include "cpu/base_dyn_inst.hh"
#include "cpu/inst_seq.hh"
#include "cpu/reg_class.hh"
class Packet;
template <class Impl>
class BaseO3DynInst : public BaseDynInst<Impl>
{
public:
/** Typedef for the CPU. */
typedef typename Impl::O3CPU O3CPU;
/** Binary machine instruction type. */
typedef TheISA::MachInst MachInst;
/** Register types. */
using VecRegContainer = TheISA::VecRegContainer;
using VecElem = TheISA::VecElem;
static constexpr auto NumVecElemPerVecReg = TheISA::NumVecElemPerVecReg;
using VecPredRegContainer = TheISA::VecPredRegContainer;
enum {
MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs
MaxInstDestRegs = TheISA::MaxInstDestRegs //< Max dest regs
};
public:
/** BaseDynInst constructor given a binary instruction. */
BaseO3DynInst(const StaticInstPtr &staticInst, const StaticInstPtr
¯oop, TheISA::PCState pc, TheISA::PCState predPC,
InstSeqNum seq_num, O3CPU *cpu);
/** BaseDynInst constructor given a static inst pointer. */
BaseO3DynInst(const StaticInstPtr &_staticInst,
const StaticInstPtr &_macroop);
~BaseO3DynInst();
/** Executes the instruction.*/
Fault execute();
/** Initiates the access. Only valid for memory operations. */
Fault initiateAcc();
/** Completes the access. Only valid for memory operations. */
Fault completeAcc(PacketPtr pkt);
private:
/** Initializes variables. */
void initVars();
protected:
/** Explicitation of dependent names. */
using BaseDynInst<Impl>::cpu;
using BaseDynInst<Impl>::_srcRegIdx;
using BaseDynInst<Impl>::_destRegIdx;
/** Values to be written to the destination misc. registers. */
std::array<RegVal, TheISA::MaxMiscDestRegs> _destMiscRegVal;
/** Indexes of the destination misc. registers. They are needed to defer
* the write accesses to the misc. registers until the commit stage, when
* the instruction is out of its speculative state.
*/
std::array<short, TheISA::MaxMiscDestRegs> _destMiscRegIdx;
/** Number of destination misc. registers. */
uint8_t _numDestMiscRegs;
public:
#if TRACING_ON
/** Tick records used for the pipeline activity viewer. */
Tick fetchTick; // instruction fetch is completed.
int32_t decodeTick; // instruction enters decode phase
int32_t renameTick; // instruction enters rename phase
int32_t dispatchTick;
int32_t issueTick;
int32_t completeTick;
int32_t commitTick;
int32_t storeTick;
#endif
/** Reads a misc. register, including any side-effects the read
* might have as defined by the architecture.
*/
RegVal
readMiscReg(int misc_reg) override
{
return this->cpu->readMiscReg(misc_reg, this->threadNumber);
}
/** Sets a misc. register, including any side-effects the write
* might have as defined by the architecture.
*/
void
setMiscReg(int misc_reg, RegVal val) override
{
/** Writes to misc. registers are recorded and deferred until the
* commit stage, when updateMiscRegs() is called. First, check if
* the misc reg has been written before and update its value to be
* committed instead of making a new entry. If not, make a new
* entry and record the write.
*/
for (int idx = 0; idx < _numDestMiscRegs; idx++) {
if (_destMiscRegIdx[idx] == misc_reg) {
_destMiscRegVal[idx] = val;
return;
}
}
assert(_numDestMiscRegs < TheISA::MaxMiscDestRegs);
_destMiscRegIdx[_numDestMiscRegs] = misc_reg;
_destMiscRegVal[_numDestMiscRegs] = val;
_numDestMiscRegs++;
}
/** Reads a misc. register, including any side-effects the read
* might have as defined by the architecture.
*/
RegVal
readMiscRegOperand(const StaticInst *si, int idx) override
{
const RegId& reg = si->srcRegIdx(idx);
assert(reg.isMiscReg());
return this->cpu->readMiscReg(reg.index(), this->threadNumber);
}
/** Sets a misc. register, including any side-effects the write
* might have as defined by the architecture.
*/
void
setMiscRegOperand(const StaticInst *si, int idx, RegVal val) override
{
const RegId& reg = si->destRegIdx(idx);
assert(reg.isMiscReg());
setMiscReg(reg.index(), val);
}
/** Called at the commit stage to update the misc. registers. */
void
updateMiscRegs()
{
// @todo: Pretty convoluted way to avoid squashing from happening when
// using the TC during an instruction's execution (specifically for
// instructions that have side-effects that use the TC). Fix this.
// See cpu/o3/dyn_inst_impl.hh.
bool no_squash_from_TC = this->thread->noSquashFromTC;
this->thread->noSquashFromTC = true;
for (int i = 0; i < _numDestMiscRegs; i++)
this->cpu->setMiscReg(
_destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber);
this->thread->noSquashFromTC = no_squash_from_TC;
}
void forwardOldRegs()
{
for (int idx = 0; idx < this->numDestRegs(); idx++) {
PhysRegIdPtr prev_phys_reg = this->prevDestRegIdx(idx);
const RegId& original_dest_reg =
this->staticInst->destRegIdx(idx);
switch (original_dest_reg.classValue()) {
case IntRegClass:
this->setIntRegOperand(this->staticInst.get(), idx,
this->cpu->readIntReg(prev_phys_reg));
break;
case FloatRegClass:
this->setFloatRegOperandBits(this->staticInst.get(), idx,
this->cpu->readFloatReg(prev_phys_reg));
break;
case VecRegClass:
this->setVecRegOperand(this->staticInst.get(), idx,
this->cpu->readVecReg(prev_phys_reg));
break;
case VecElemClass:
this->setVecElemOperand(this->staticInst.get(), idx,
this->cpu->readVecElem(prev_phys_reg));
break;
case VecPredRegClass:
this->setVecPredRegOperand(this->staticInst.get(), idx,
this->cpu->readVecPredReg(prev_phys_reg));
break;
case CCRegClass:
this->setCCRegOperand(this->staticInst.get(), idx,
this->cpu->readCCReg(prev_phys_reg));
break;
case MiscRegClass:
// no need to forward misc reg values
break;
default:
panic("Unknown register class: %d",
(int)original_dest_reg.classValue());
}
}
}
/** Calls hardware return from error interrupt. */
Fault hwrei() override;
/** Traps to handle specified fault. */
void trap(const Fault &fault);
bool simPalCheck(int palFunc) override;
/** Emulates a syscall. */
void syscall(int64_t callnum, Fault *fault) override;
public:
// The register accessor methods provide the index of the
// instruction's operand (e.g., 0 or 1), not the architectural
// register index, to simplify the implementation of register
// renaming. We find the architectural register index by indexing
// into the instruction's own operand index table. Note that a
// raw pointer to the StaticInst is provided instead of a
// ref-counted StaticInstPtr to redice overhead. This is fine as
// long as these methods don't copy the pointer into any long-term
// storage (which is pretty hard to imagine they would have reason
// to do).
RegVal
readIntRegOperand(const StaticInst *si, int idx) override
{
return this->cpu->readIntReg(this->_srcRegIdx[idx]);
}
RegVal
readFloatRegOperandBits(const StaticInst *si, int idx) override
{
return this->cpu->readFloatReg(this->_srcRegIdx[idx]);
}
const VecRegContainer&
readVecRegOperand(const StaticInst *si, int idx) const override
{
return this->cpu->readVecReg(this->_srcRegIdx[idx]);
}
/**
* Read destination vector register operand for modification.
*/
VecRegContainer&
getWritableVecRegOperand(const StaticInst *si, int idx) override
{
return this->cpu->getWritableVecReg(this->_destRegIdx[idx]);
}
/** Vector Register Lane Interfaces. */
/** @{ */
/** Reads source vector 8bit operand. */
ConstVecLane8
readVec8BitLaneOperand(const StaticInst *si, int idx) const override
{
return cpu->template readVecLane<uint8_t>(_srcRegIdx[idx]);
}
/** Reads source vector 16bit operand. */
ConstVecLane16
readVec16BitLaneOperand(const StaticInst *si, int idx) const override
{
return cpu->template readVecLane<uint16_t>(_srcRegIdx[idx]);
}
/** Reads source vector 32bit operand. */
ConstVecLane32
readVec32BitLaneOperand(const StaticInst *si, int idx) const override
{
return cpu->template readVecLane<uint32_t>(_srcRegIdx[idx]);
}
/** Reads source vector 64bit operand. */
ConstVecLane64
readVec64BitLaneOperand(const StaticInst *si, int idx) const override
{
return cpu->template readVecLane<uint64_t>(_srcRegIdx[idx]);
}
/** Write a lane of the destination vector operand. */
template <typename LD>
void
setVecLaneOperandT(const StaticInst *si, int idx, const LD& val)
{
return cpu->template setVecLane(_destRegIdx[idx], val);
}
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::Byte>& val) override
{
return setVecLaneOperandT(si, idx, val);
}
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::TwoByte>& val) override
{
return setVecLaneOperandT(si, idx, val);
}
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::FourByte>& val) override
{
return setVecLaneOperandT(si, idx, val);
}
virtual void
setVecLaneOperand(const StaticInst *si, int idx,
const LaneData<LaneSize::EightByte>& val) override
{
return setVecLaneOperandT(si, idx, val);
}
/** @} */
VecElem readVecElemOperand(const StaticInst *si, int idx) const override
{
return this->cpu->readVecElem(this->_srcRegIdx[idx]);
}
const VecPredRegContainer&
readVecPredRegOperand(const StaticInst *si, int idx) const override
{
return this->cpu->readVecPredReg(this->_srcRegIdx[idx]);
}
VecPredRegContainer&
getWritableVecPredRegOperand(const StaticInst *si, int idx) override
{
return this->cpu->getWritableVecPredReg(this->_destRegIdx[idx]);
}
RegVal
readCCRegOperand(const StaticInst *si, int idx) override
{
return this->cpu->readCCReg(this->_srcRegIdx[idx]);
}
/** @todo: Make results into arrays so they can handle multiple dest
* registers.
*/
void
setIntRegOperand(const StaticInst *si, int idx, RegVal val) override
{
this->cpu->setIntReg(this->_destRegIdx[idx], val);
BaseDynInst<Impl>::setIntRegOperand(si, idx, val);
}
void
setFloatRegOperandBits(const StaticInst *si, int idx, RegVal val) override
{
this->cpu->setFloatReg(this->_destRegIdx[idx], val);
BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val);
}
void
setVecRegOperand(const StaticInst *si, int idx,
const VecRegContainer& val) override
{
this->cpu->setVecReg(this->_destRegIdx[idx], val);
BaseDynInst<Impl>::setVecRegOperand(si, idx, val);
}
void setVecElemOperand(const StaticInst *si, int idx,
const VecElem val) override
{
int reg_idx = idx;
this->cpu->setVecElem(this->_destRegIdx[reg_idx], val);
BaseDynInst<Impl>::setVecElemOperand(si, idx, val);
}
void
setVecPredRegOperand(const StaticInst *si, int idx,
const VecPredRegContainer& val) override
{
this->cpu->setVecPredReg(this->_destRegIdx[idx], val);
BaseDynInst<Impl>::setVecPredRegOperand(si, idx, val);
}
void setCCRegOperand(const StaticInst *si, int idx, RegVal val) override
{
this->cpu->setCCReg(this->_destRegIdx[idx], val);
BaseDynInst<Impl>::setCCRegOperand(si, idx, val);
}
};
#endif // __CPU_O3_ALPHA_DYN_INST_HH__
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