| /* |
| * 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. |
| */ |
| |
| #ifndef __CPU_O3_DYN_INST_HH__ |
| #define __CPU_O3_DYN_INST_HH__ |
| |
| #include <algorithm> |
| #include <array> |
| #include <deque> |
| #include <list> |
| #include <string> |
| |
| #include "base/refcnt.hh" |
| #include "base/trace.hh" |
| #include "config/the_isa.hh" |
| #include "cpu/checker/cpu.hh" |
| #include "cpu/exec_context.hh" |
| #include "cpu/exetrace.hh" |
| #include "cpu/inst_res.hh" |
| #include "cpu/inst_seq.hh" |
| #include "cpu/o3/cpu.hh" |
| #include "cpu/o3/dyn_inst_ptr.hh" |
| #include "cpu/o3/lsq_unit.hh" |
| #include "cpu/op_class.hh" |
| #include "cpu/reg_class.hh" |
| #include "cpu/static_inst.hh" |
| #include "cpu/translation.hh" |
| #include "debug/HtmCpu.hh" |
| |
| namespace gem5 |
| { |
| |
| class Packet; |
| |
| namespace o3 |
| { |
| |
| class DynInst : public ExecContext, public RefCounted |
| { |
| private: |
| DynInst(const StaticInstPtr &staticInst, const StaticInstPtr ¯oop, |
| InstSeqNum seq_num, CPU *cpu); |
| |
| public: |
| // The list of instructions iterator type. |
| typedef typename std::list<DynInstPtr>::iterator ListIt; |
| |
| struct Arrays |
| { |
| size_t numSrcs; |
| size_t numDests; |
| |
| RegId *flatDestIdx; |
| PhysRegIdPtr *destIdx; |
| PhysRegIdPtr *prevDestIdx; |
| PhysRegIdPtr *srcIdx; |
| uint8_t *readySrcIdx; |
| }; |
| |
| static void *operator new(size_t count, Arrays &arrays); |
| |
| /** BaseDynInst constructor given a binary instruction. */ |
| DynInst(const Arrays &arrays, const StaticInstPtr &staticInst, |
| const StaticInstPtr ¯oop, InstSeqNum seq_num, CPU *cpu); |
| |
| DynInst(const Arrays &arrays, const StaticInstPtr &staticInst, |
| const StaticInstPtr ¯oop, const PCStateBase &pc, |
| const PCStateBase &pred_pc, InstSeqNum seq_num, CPU *cpu); |
| |
| /** BaseDynInst constructor given a static inst pointer. */ |
| DynInst(const Arrays &arrays, const StaticInstPtr &_staticInst, |
| const StaticInstPtr &_macroop); |
| |
| ~DynInst(); |
| |
| /** 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); |
| |
| /** The sequence number of the instruction. */ |
| InstSeqNum seqNum = 0; |
| |
| /** The StaticInst used by this BaseDynInst. */ |
| const StaticInstPtr staticInst; |
| |
| /** Pointer to the Impl's CPU object. */ |
| CPU *cpu = nullptr; |
| |
| BaseCPU *getCpuPtr() { return cpu; } |
| |
| /** Pointer to the thread state. */ |
| ThreadState *thread = nullptr; |
| |
| /** The kind of fault this instruction has generated. */ |
| Fault fault = NoFault; |
| |
| /** InstRecord that tracks this instructions. */ |
| Trace::InstRecord *traceData = nullptr; |
| |
| protected: |
| enum Status |
| { |
| IqEntry, /// Instruction is in the IQ |
| RobEntry, /// Instruction is in the ROB |
| LsqEntry, /// Instruction is in the LSQ |
| Completed, /// Instruction has completed |
| ResultReady, /// Instruction has its result |
| CanIssue, /// Instruction can issue and execute |
| Issued, /// Instruction has issued |
| Executed, /// Instruction has executed |
| CanCommit, /// Instruction can commit |
| AtCommit, /// Instruction has reached commit |
| Committed, /// Instruction has committed |
| Squashed, /// Instruction is squashed |
| SquashedInIQ, /// Instruction is squashed in the IQ |
| SquashedInLSQ, /// Instruction is squashed in the LSQ |
| SquashedInROB, /// Instruction is squashed in the ROB |
| PinnedRegsRenamed, /// Pinned registers are renamed |
| PinnedRegsWritten, /// Pinned registers are written back |
| PinnedRegsSquashDone, /// Regs pinning status updated after squash |
| RecoverInst, /// Is a recover instruction |
| BlockingInst, /// Is a blocking instruction |
| ThreadsyncWait, /// Is a thread synchronization instruction |
| SerializeBefore, /// Needs to serialize on |
| /// instructions ahead of it |
| SerializeAfter, /// Needs to serialize instructions behind it |
| SerializeHandled, /// Serialization has been handled |
| NumStatus |
| }; |
| |
| enum Flags |
| { |
| NotAnInst, |
| TranslationStarted, |
| TranslationCompleted, |
| PossibleLoadViolation, |
| HitExternalSnoop, |
| EffAddrValid, |
| RecordResult, |
| Predicate, |
| MemAccPredicate, |
| PredTaken, |
| IsStrictlyOrdered, |
| ReqMade, |
| MemOpDone, |
| HtmFromTransaction, |
| MaxFlags |
| }; |
| |
| private: |
| /* An amalgamation of a lot of boolean values into one */ |
| std::bitset<MaxFlags> instFlags; |
| |
| /** The status of this BaseDynInst. Several bits can be set. */ |
| std::bitset<NumStatus> status; |
| |
| protected: |
| /** The result of the instruction; assumes an instruction can have many |
| * destination registers. |
| */ |
| std::queue<InstResult> instResult; |
| |
| /** PC state for this instruction. */ |
| std::unique_ptr<PCStateBase> pc; |
| |
| /** Values to be written to the destination misc. registers. */ |
| std::vector<RegVal> _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::vector<short> _destMiscRegIdx; |
| |
| size_t _numSrcs; |
| size_t _numDests; |
| |
| // Flattened register index of the destination registers of this |
| // instruction. |
| RegId *_flatDestIdx; |
| |
| // Physical register index of the destination registers of this |
| // instruction. |
| PhysRegIdPtr *_destIdx; |
| |
| // Physical register index of the previous producers of the |
| // architected destinations. |
| PhysRegIdPtr *_prevDestIdx; |
| |
| // Physical register index of the source registers of this instruction. |
| PhysRegIdPtr *_srcIdx; |
| |
| // Whether or not the source register is ready, one bit per register. |
| uint8_t *_readySrcIdx; |
| |
| public: |
| size_t numSrcs() const { return _numSrcs; } |
| size_t numDests() const { return _numDests; } |
| |
| // Returns the flattened register index of the idx'th destination |
| // register. |
| const RegId & |
| flattenedDestIdx(int idx) const |
| { |
| return _flatDestIdx[idx]; |
| } |
| |
| // Flattens a destination architectural register index into a logical |
| // index. |
| void |
| flattenedDestIdx(int idx, const RegId ®_id) |
| { |
| _flatDestIdx[idx] = reg_id; |
| } |
| |
| // Returns the physical register index of the idx'th destination |
| // register. |
| PhysRegIdPtr |
| renamedDestIdx(int idx) const |
| { |
| return _destIdx[idx]; |
| } |
| |
| // Set the renamed dest register id. |
| void |
| renamedDestIdx(int idx, PhysRegIdPtr phys_reg_id) |
| { |
| _destIdx[idx] = phys_reg_id; |
| } |
| |
| // Returns the physical register index of the previous physical |
| // register that remapped to the same logical register index. |
| PhysRegIdPtr |
| prevDestIdx(int idx) const |
| { |
| return _prevDestIdx[idx]; |
| } |
| |
| // Set the previous renamed dest register id. |
| void |
| prevDestIdx(int idx, PhysRegIdPtr phys_reg_id) |
| { |
| _prevDestIdx[idx] = phys_reg_id; |
| } |
| |
| // Returns the physical register index of the i'th source register. |
| PhysRegIdPtr |
| renamedSrcIdx(int idx) const |
| { |
| return _srcIdx[idx]; |
| } |
| |
| void |
| renamedSrcIdx(int idx, PhysRegIdPtr phys_reg_id) |
| { |
| _srcIdx[idx] = phys_reg_id; |
| } |
| |
| bool |
| readySrcIdx(int idx) const |
| { |
| uint8_t &byte = _readySrcIdx[idx / 8]; |
| return bits(byte, idx % 8); |
| } |
| |
| void |
| readySrcIdx(int idx, bool ready) |
| { |
| uint8_t &byte = _readySrcIdx[idx / 8]; |
| replaceBits(byte, idx % 8, ready ? 1 : 0); |
| } |
| |
| /** The thread this instruction is from. */ |
| ThreadID threadNumber = 0; |
| |
| /** Iterator pointing to this BaseDynInst in the list of all insts. */ |
| ListIt instListIt; |
| |
| ////////////////////// Branch Data /////////////// |
| /** Predicted PC state after this instruction. */ |
| std::unique_ptr<PCStateBase> predPC; |
| |
| /** The Macroop if one exists */ |
| const StaticInstPtr macroop; |
| |
| /** How many source registers are ready. */ |
| uint8_t readyRegs = 0; |
| |
| public: |
| /////////////////////// Load Store Data ////////////////////// |
| /** The effective virtual address (lds & stores only). */ |
| Addr effAddr = 0; |
| |
| /** The effective physical address. */ |
| Addr physEffAddr = 0; |
| |
| /** The memory request flags (from translation). */ |
| unsigned memReqFlags = 0; |
| |
| /** The size of the request */ |
| unsigned effSize; |
| |
| /** Pointer to the data for the memory access. */ |
| uint8_t *memData = nullptr; |
| |
| /** Load queue index. */ |
| ssize_t lqIdx = -1; |
| typename LSQUnit::LQIterator lqIt; |
| |
| /** Store queue index. */ |
| ssize_t sqIdx = -1; |
| typename LSQUnit::SQIterator sqIt; |
| |
| |
| /////////////////////// TLB Miss ////////////////////// |
| /** |
| * Saved memory request (needed when the DTB address translation is |
| * delayed due to a hw page table walk). |
| */ |
| LSQ::LSQRequest *savedRequest; |
| |
| /////////////////////// Checker ////////////////////// |
| // Need a copy of main request pointer to verify on writes. |
| RequestPtr reqToVerify; |
| |
| public: |
| /** Records changes to result? */ |
| void recordResult(bool f) { instFlags[RecordResult] = f; } |
| |
| /** Is the effective virtual address valid. */ |
| bool effAddrValid() const { return instFlags[EffAddrValid]; } |
| void effAddrValid(bool b) { instFlags[EffAddrValid] = b; } |
| |
| /** Whether or not the memory operation is done. */ |
| bool memOpDone() const { return instFlags[MemOpDone]; } |
| void memOpDone(bool f) { instFlags[MemOpDone] = f; } |
| |
| bool notAnInst() const { return instFlags[NotAnInst]; } |
| void setNotAnInst() { instFlags[NotAnInst] = true; } |
| |
| |
| //////////////////////////////////////////// |
| // |
| // INSTRUCTION EXECUTION |
| // |
| //////////////////////////////////////////// |
| |
| void |
| demapPage(Addr vaddr, uint64_t asn) override |
| { |
| cpu->demapPage(vaddr, asn); |
| } |
| |
| Fault initiateMemRead(Addr addr, unsigned size, Request::Flags flags, |
| const std::vector<bool> &byte_enable) override; |
| |
| Fault initiateHtmCmd(Request::Flags flags) override; |
| |
| Fault writeMem(uint8_t *data, unsigned size, Addr addr, |
| Request::Flags flags, uint64_t *res, |
| const std::vector<bool> &byte_enable) override; |
| |
| Fault initiateMemAMO(Addr addr, unsigned size, Request::Flags flags, |
| AtomicOpFunctorPtr amo_op) override; |
| |
| /** True if the DTB address translation has started. */ |
| bool translationStarted() const { return instFlags[TranslationStarted]; } |
| void translationStarted(bool f) { instFlags[TranslationStarted] = f; } |
| |
| /** True if the DTB address translation has completed. */ |
| bool |
| translationCompleted() const |
| { |
| return instFlags[TranslationCompleted]; |
| } |
| void translationCompleted(bool f) { instFlags[TranslationCompleted] = f; } |
| |
| /** True if this address was found to match a previous load and they issued |
| * out of order. If that happend, then it's only a problem if an incoming |
| * snoop invalidate modifies the line, in which case we need to squash. |
| * If nothing modified the line the order doesn't matter. |
| */ |
| bool |
| possibleLoadViolation() const |
| { |
| return instFlags[PossibleLoadViolation]; |
| } |
| void |
| possibleLoadViolation(bool f) |
| { |
| instFlags[PossibleLoadViolation] = f; |
| } |
| |
| /** True if the address hit a external snoop while sitting in the LSQ. |
| * If this is true and a older instruction sees it, this instruction must |
| * reexecute |
| */ |
| bool hitExternalSnoop() const { return instFlags[HitExternalSnoop]; } |
| void hitExternalSnoop(bool f) { instFlags[HitExternalSnoop] = f; } |
| |
| /** |
| * Returns true if the DTB address translation is being delayed due to a hw |
| * page table walk. |
| */ |
| bool |
| isTranslationDelayed() const |
| { |
| return (translationStarted() && !translationCompleted()); |
| } |
| |
| public: |
| #ifdef DEBUG |
| void dumpSNList(); |
| #endif |
| |
| /** Renames a destination register to a physical register. Also records |
| * the previous physical register that the logical register mapped to. |
| */ |
| void |
| renameDestReg(int idx, PhysRegIdPtr renamed_dest, |
| PhysRegIdPtr previous_rename) |
| { |
| renamedDestIdx(idx, renamed_dest); |
| prevDestIdx(idx, previous_rename); |
| if (renamed_dest->isPinned()) |
| setPinnedRegsRenamed(); |
| } |
| |
| /** Renames a source logical register to the physical register which |
| * has/will produce that logical register's result. |
| * @todo: add in whether or not the source register is ready. |
| */ |
| void |
| renameSrcReg(int idx, PhysRegIdPtr renamed_src) |
| { |
| renamedSrcIdx(idx, renamed_src); |
| } |
| |
| /** Dumps out contents of this BaseDynInst. */ |
| void dump(); |
| |
| /** Dumps out contents of this BaseDynInst into given string. */ |
| void dump(std::string &outstring); |
| |
| /** Read this CPU's ID. */ |
| int cpuId() const { return cpu->cpuId(); } |
| |
| /** Read this CPU's Socket ID. */ |
| uint32_t socketId() const { return cpu->socketId(); } |
| |
| /** Read this CPU's data requestor ID */ |
| RequestorID requestorId() const { return cpu->dataRequestorId(); } |
| |
| /** Read this context's system-wide ID **/ |
| ContextID contextId() const { return thread->contextId(); } |
| |
| /** Returns the fault type. */ |
| Fault getFault() const { return fault; } |
| /** TODO: This I added for the LSQRequest side to be able to modify the |
| * fault. There should be a better mechanism in place. */ |
| Fault& getFault() { return fault; } |
| |
| /** Checks whether or not this instruction has had its branch target |
| * calculated yet. For now it is not utilized and is hacked to be |
| * always false. |
| * @todo: Actually use this instruction. |
| */ |
| bool doneTargCalc() { return false; } |
| |
| /** Set the predicted target of this current instruction. */ |
| void setPredTarg(const PCStateBase &pred_pc) { set(predPC, pred_pc); } |
| |
| const PCStateBase &readPredTarg() { return *predPC; } |
| |
| /** Returns whether the instruction was predicted taken or not. */ |
| bool readPredTaken() { return instFlags[PredTaken]; } |
| |
| void |
| setPredTaken(bool predicted_taken) |
| { |
| instFlags[PredTaken] = predicted_taken; |
| } |
| |
| /** Returns whether the instruction mispredicted. */ |
| bool |
| mispredicted() |
| { |
| std::unique_ptr<PCStateBase> next_pc(pc->clone()); |
| staticInst->advancePC(*next_pc); |
| return *next_pc != *predPC; |
| } |
| |
| // |
| // Instruction types. Forward checks to StaticInst object. |
| // |
| bool isNop() const { return staticInst->isNop(); } |
| bool isMemRef() const { return staticInst->isMemRef(); } |
| bool isLoad() const { return staticInst->isLoad(); } |
| bool isStore() const { return staticInst->isStore(); } |
| bool isAtomic() const { return staticInst->isAtomic(); } |
| bool isStoreConditional() const |
| { return staticInst->isStoreConditional(); } |
| bool isInstPrefetch() const { return staticInst->isInstPrefetch(); } |
| bool isDataPrefetch() const { return staticInst->isDataPrefetch(); } |
| bool isInteger() const { return staticInst->isInteger(); } |
| bool isFloating() const { return staticInst->isFloating(); } |
| bool isVector() const { return staticInst->isVector(); } |
| bool isControl() const { return staticInst->isControl(); } |
| bool isCall() const { return staticInst->isCall(); } |
| bool isReturn() const { return staticInst->isReturn(); } |
| bool isDirectCtrl() const { return staticInst->isDirectCtrl(); } |
| bool isIndirectCtrl() const { return staticInst->isIndirectCtrl(); } |
| bool isCondCtrl() const { return staticInst->isCondCtrl(); } |
| bool isUncondCtrl() const { return staticInst->isUncondCtrl(); } |
| bool isSerializing() const { return staticInst->isSerializing(); } |
| bool |
| isSerializeBefore() const |
| { |
| return staticInst->isSerializeBefore() || status[SerializeBefore]; |
| } |
| bool |
| isSerializeAfter() const |
| { |
| return staticInst->isSerializeAfter() || status[SerializeAfter]; |
| } |
| bool isSquashAfter() const { return staticInst->isSquashAfter(); } |
| bool isFullMemBarrier() const { return staticInst->isFullMemBarrier(); } |
| bool isReadBarrier() const { return staticInst->isReadBarrier(); } |
| bool isWriteBarrier() const { return staticInst->isWriteBarrier(); } |
| bool isNonSpeculative() const { return staticInst->isNonSpeculative(); } |
| bool isQuiesce() const { return staticInst->isQuiesce(); } |
| bool isUnverifiable() const { return staticInst->isUnverifiable(); } |
| bool isSyscall() const { return staticInst->isSyscall(); } |
| bool isMacroop() const { return staticInst->isMacroop(); } |
| bool isMicroop() const { return staticInst->isMicroop(); } |
| bool isDelayedCommit() const { return staticInst->isDelayedCommit(); } |
| bool isLastMicroop() const { return staticInst->isLastMicroop(); } |
| bool isFirstMicroop() const { return staticInst->isFirstMicroop(); } |
| // hardware transactional memory |
| bool isHtmStart() const { return staticInst->isHtmStart(); } |
| bool isHtmStop() const { return staticInst->isHtmStop(); } |
| bool isHtmCancel() const { return staticInst->isHtmCancel(); } |
| bool isHtmCmd() const { return staticInst->isHtmCmd(); } |
| |
| uint64_t |
| getHtmTransactionUid() const override |
| { |
| assert(instFlags[HtmFromTransaction]); |
| return htmUid; |
| } |
| |
| uint64_t |
| newHtmTransactionUid() const override |
| { |
| panic("Not yet implemented\n"); |
| return 0; |
| } |
| |
| bool |
| inHtmTransactionalState() const override |
| { |
| return instFlags[HtmFromTransaction]; |
| } |
| |
| uint64_t |
| getHtmTransactionalDepth() const override |
| { |
| if (inHtmTransactionalState()) |
| return htmDepth; |
| else |
| return 0; |
| } |
| |
| void |
| setHtmTransactionalState(uint64_t htm_uid, uint64_t htm_depth) |
| { |
| instFlags.set(HtmFromTransaction); |
| htmUid = htm_uid; |
| htmDepth = htm_depth; |
| } |
| |
| void |
| clearHtmTransactionalState() |
| { |
| if (inHtmTransactionalState()) { |
| DPRINTF(HtmCpu, |
| "clearing instuction's transactional state htmUid=%u\n", |
| getHtmTransactionUid()); |
| |
| instFlags.reset(HtmFromTransaction); |
| htmUid = -1; |
| htmDepth = 0; |
| } |
| } |
| |
| /** Temporarily sets this instruction as a serialize before instruction. */ |
| void setSerializeBefore() { status.set(SerializeBefore); } |
| |
| /** Clears the serializeBefore part of this instruction. */ |
| void clearSerializeBefore() { status.reset(SerializeBefore); } |
| |
| /** Checks if this serializeBefore is only temporarily set. */ |
| bool isTempSerializeBefore() { return status[SerializeBefore]; } |
| |
| /** Temporarily sets this instruction as a serialize after instruction. */ |
| void setSerializeAfter() { status.set(SerializeAfter); } |
| |
| /** Clears the serializeAfter part of this instruction.*/ |
| void clearSerializeAfter() { status.reset(SerializeAfter); } |
| |
| /** Checks if this serializeAfter is only temporarily set. */ |
| bool isTempSerializeAfter() { return status[SerializeAfter]; } |
| |
| /** Sets the serialization part of this instruction as handled. */ |
| void setSerializeHandled() { status.set(SerializeHandled); } |
| |
| /** Checks if the serialization part of this instruction has been |
| * handled. This does not apply to the temporary serializing |
| * state; it only applies to this instruction's own permanent |
| * serializing state. |
| */ |
| bool isSerializeHandled() { return status[SerializeHandled]; } |
| |
| /** Returns the opclass of this instruction. */ |
| OpClass opClass() const { return staticInst->opClass(); } |
| |
| /** Returns the branch target address. */ |
| std::unique_ptr<PCStateBase> |
| branchTarget() const |
| { |
| return staticInst->branchTarget(*pc); |
| } |
| |
| /** Returns the number of source registers. */ |
| size_t numSrcRegs() const { return numSrcs(); } |
| |
| /** Returns the number of destination registers. */ |
| size_t numDestRegs() const { return numDests(); } |
| |
| // the following are used to track physical register usage |
| // for machines with separate int & FP reg files |
| int8_t numFPDestRegs() const { return staticInst->numFPDestRegs(); } |
| int8_t numIntDestRegs() const { return staticInst->numIntDestRegs(); } |
| int8_t numCCDestRegs() const { return staticInst->numCCDestRegs(); } |
| int8_t numVecDestRegs() const { return staticInst->numVecDestRegs(); } |
| int8_t |
| numVecElemDestRegs() const |
| { |
| return staticInst->numVecElemDestRegs(); |
| } |
| int8_t |
| numVecPredDestRegs() const |
| { |
| return staticInst->numVecPredDestRegs(); |
| } |
| |
| /** Returns the logical register index of the i'th destination register. */ |
| const RegId& destRegIdx(int i) const { return staticInst->destRegIdx(i); } |
| |
| /** Returns the logical register index of the i'th source register. */ |
| const RegId& srcRegIdx(int i) const { return staticInst->srcRegIdx(i); } |
| |
| /** Return the size of the instResult queue. */ |
| uint8_t resultSize() { return instResult.size(); } |
| |
| /** Pops a result off the instResult queue. |
| * If the result stack is empty, return the default value. |
| * */ |
| InstResult |
| popResult(InstResult dflt=InstResult()) |
| { |
| if (!instResult.empty()) { |
| InstResult t = instResult.front(); |
| instResult.pop(); |
| return t; |
| } |
| return dflt; |
| } |
| |
| /** Pushes a result onto the instResult queue. */ |
| /** @{ */ |
| template<typename T> |
| void |
| setResult(T &&t) |
| { |
| if (instFlags[RecordResult]) { |
| instResult.emplace(std::forward<T>(t)); |
| } |
| } |
| /** @} */ |
| |
| /** Records that one of the source registers is ready. */ |
| void markSrcRegReady(); |
| |
| /** Marks a specific register as ready. */ |
| void markSrcRegReady(RegIndex src_idx); |
| |
| /** Sets this instruction as completed. */ |
| void setCompleted() { status.set(Completed); } |
| |
| /** Returns whether or not this instruction is completed. */ |
| bool isCompleted() const { return status[Completed]; } |
| |
| /** Marks the result as ready. */ |
| void setResultReady() { status.set(ResultReady); } |
| |
| /** Returns whether or not the result is ready. */ |
| bool isResultReady() const { return status[ResultReady]; } |
| |
| /** Sets this instruction as ready to issue. */ |
| void setCanIssue() { status.set(CanIssue); } |
| |
| /** Returns whether or not this instruction is ready to issue. */ |
| bool readyToIssue() const { return status[CanIssue]; } |
| |
| /** Clears this instruction being able to issue. */ |
| void clearCanIssue() { status.reset(CanIssue); } |
| |
| /** Sets this instruction as issued from the IQ. */ |
| void setIssued() { status.set(Issued); } |
| |
| /** Returns whether or not this instruction has issued. */ |
| bool isIssued() const { return status[Issued]; } |
| |
| /** Clears this instruction as being issued. */ |
| void clearIssued() { status.reset(Issued); } |
| |
| /** Sets this instruction as executed. */ |
| void setExecuted() { status.set(Executed); } |
| |
| /** Returns whether or not this instruction has executed. */ |
| bool isExecuted() const { return status[Executed]; } |
| |
| /** Sets this instruction as ready to commit. */ |
| void setCanCommit() { status.set(CanCommit); } |
| |
| /** Clears this instruction as being ready to commit. */ |
| void clearCanCommit() { status.reset(CanCommit); } |
| |
| /** Returns whether or not this instruction is ready to commit. */ |
| bool readyToCommit() const { return status[CanCommit]; } |
| |
| void setAtCommit() { status.set(AtCommit); } |
| |
| bool isAtCommit() { return status[AtCommit]; } |
| |
| /** Sets this instruction as committed. */ |
| void setCommitted() { status.set(Committed); } |
| |
| /** Returns whether or not this instruction is committed. */ |
| bool isCommitted() const { return status[Committed]; } |
| |
| /** Sets this instruction as squashed. */ |
| void setSquashed(); |
| |
| /** Returns whether or not this instruction is squashed. */ |
| bool isSquashed() const { return status[Squashed]; } |
| |
| //Instruction Queue Entry |
| //----------------------- |
| /** Sets this instruction as a entry the IQ. */ |
| void setInIQ() { status.set(IqEntry); } |
| |
| /** Sets this instruction as a entry the IQ. */ |
| void clearInIQ() { status.reset(IqEntry); } |
| |
| /** Returns whether or not this instruction has issued. */ |
| bool isInIQ() const { return status[IqEntry]; } |
| |
| /** Sets this instruction as squashed in the IQ. */ |
| void setSquashedInIQ() { status.set(SquashedInIQ); status.set(Squashed);} |
| |
| /** Returns whether or not this instruction is squashed in the IQ. */ |
| bool isSquashedInIQ() const { return status[SquashedInIQ]; } |
| |
| |
| //Load / Store Queue Functions |
| //----------------------- |
| /** Sets this instruction as a entry the LSQ. */ |
| void setInLSQ() { status.set(LsqEntry); } |
| |
| /** Sets this instruction as a entry the LSQ. */ |
| void removeInLSQ() { status.reset(LsqEntry); } |
| |
| /** Returns whether or not this instruction is in the LSQ. */ |
| bool isInLSQ() const { return status[LsqEntry]; } |
| |
| /** Sets this instruction as squashed in the LSQ. */ |
| void setSquashedInLSQ() { status.set(SquashedInLSQ); status.set(Squashed);} |
| |
| /** Returns whether or not this instruction is squashed in the LSQ. */ |
| bool isSquashedInLSQ() const { return status[SquashedInLSQ]; } |
| |
| |
| //Reorder Buffer Functions |
| //----------------------- |
| /** Sets this instruction as a entry the ROB. */ |
| void setInROB() { status.set(RobEntry); } |
| |
| /** Sets this instruction as a entry the ROB. */ |
| void clearInROB() { status.reset(RobEntry); } |
| |
| /** Returns whether or not this instruction is in the ROB. */ |
| bool isInROB() const { return status[RobEntry]; } |
| |
| /** Sets this instruction as squashed in the ROB. */ |
| void setSquashedInROB() { status.set(SquashedInROB); } |
| |
| /** Returns whether or not this instruction is squashed in the ROB. */ |
| bool isSquashedInROB() const { return status[SquashedInROB]; } |
| |
| /** Returns whether pinned registers are renamed */ |
| bool isPinnedRegsRenamed() const { return status[PinnedRegsRenamed]; } |
| |
| /** Sets the destination registers as renamed */ |
| void |
| setPinnedRegsRenamed() |
| { |
| assert(!status[PinnedRegsSquashDone]); |
| assert(!status[PinnedRegsWritten]); |
| status.set(PinnedRegsRenamed); |
| } |
| |
| /** Returns whether destination registers are written */ |
| bool isPinnedRegsWritten() const { return status[PinnedRegsWritten]; } |
| |
| /** Sets destination registers as written */ |
| void |
| setPinnedRegsWritten() |
| { |
| assert(!status[PinnedRegsSquashDone]); |
| assert(status[PinnedRegsRenamed]); |
| status.set(PinnedRegsWritten); |
| } |
| |
| /** Return whether dest registers' pinning status updated after squash */ |
| bool |
| isPinnedRegsSquashDone() const |
| { |
| return status[PinnedRegsSquashDone]; |
| } |
| |
| /** Sets dest registers' status updated after squash */ |
| void |
| setPinnedRegsSquashDone() |
| { |
| assert(!status[PinnedRegsSquashDone]); |
| status.set(PinnedRegsSquashDone); |
| } |
| |
| /** Read the PC state of this instruction. */ |
| const PCStateBase & |
| pcState() const override |
| { |
| return *pc; |
| } |
| |
| /** Set the PC state of this instruction. */ |
| void pcState(const PCStateBase &val) override { set(pc, val); } |
| |
| bool readPredicate() const override { return instFlags[Predicate]; } |
| |
| void |
| setPredicate(bool val) override |
| { |
| instFlags[Predicate] = val; |
| |
| if (traceData) { |
| traceData->setPredicate(val); |
| } |
| } |
| |
| bool |
| readMemAccPredicate() const override |
| { |
| return instFlags[MemAccPredicate]; |
| } |
| |
| void |
| setMemAccPredicate(bool val) override |
| { |
| instFlags[MemAccPredicate] = val; |
| } |
| |
| /** Sets the thread id. */ |
| void setTid(ThreadID tid) { threadNumber = tid; } |
| |
| /** Sets the pointer to the thread state. */ |
| void setThreadState(ThreadState *state) { thread = state; } |
| |
| /** Returns the thread context. */ |
| gem5::ThreadContext *tcBase() const override { return thread->getTC(); } |
| |
| public: |
| /** Is this instruction's memory access strictly ordered? */ |
| bool strictlyOrdered() const { return instFlags[IsStrictlyOrdered]; } |
| void strictlyOrdered(bool so) { instFlags[IsStrictlyOrdered] = so; } |
| |
| /** Has this instruction generated a memory request. */ |
| bool hasRequest() const { return instFlags[ReqMade]; } |
| /** Assert this instruction has generated a memory request. */ |
| void setRequest() { instFlags[ReqMade] = true; } |
| |
| /** Returns iterator to this instruction in the list of all insts. */ |
| ListIt &getInstListIt() { return instListIt; } |
| |
| /** Sets iterator for this instruction in the list of all insts. */ |
| void setInstListIt(ListIt _instListIt) { instListIt = _instListIt; } |
| |
| public: |
| /** Returns the number of consecutive store conditional failures. */ |
| unsigned int |
| readStCondFailures() const override |
| { |
| return thread->storeCondFailures; |
| } |
| |
| /** Sets the number of consecutive store conditional failures. */ |
| void |
| setStCondFailures(unsigned int sc_failures) override |
| { |
| thread->storeCondFailures = sc_failures; |
| } |
| |
| public: |
| // monitor/mwait funtions |
| void |
| armMonitor(Addr address) override |
| { |
| cpu->armMonitor(threadNumber, address); |
| } |
| bool |
| mwait(PacketPtr pkt) override |
| { |
| return cpu->mwait(threadNumber, pkt); |
| } |
| void |
| mwaitAtomic(gem5::ThreadContext *tc) override |
| { |
| return cpu->mwaitAtomic(threadNumber, tc, cpu->mmu); |
| } |
| AddressMonitor * |
| getAddrMonitor() override |
| { |
| return cpu->getCpuAddrMonitor(threadNumber); |
| } |
| |
| private: |
| // hardware transactional memory |
| uint64_t htmUid = -1; |
| uint64_t htmDepth = 0; |
| |
| public: |
| #if TRACING_ON |
| // Value -1 indicates that particular phase |
| // hasn't happened (yet). |
| /** Tick records used for the pipeline activity viewer. */ |
| Tick fetchTick = -1; // instruction fetch is completed. |
| int32_t decodeTick = -1; // instruction enters decode phase |
| int32_t renameTick = -1; // instruction enters rename phase |
| int32_t dispatchTick = -1; |
| int32_t issueTick = -1; |
| int32_t completeTick = -1; |
| int32_t commitTick = -1; |
| int32_t storeTick = -1; |
| #endif |
| |
| /* Values used by LoadToUse stat */ |
| Tick firstIssue = -1; |
| Tick lastWakeDependents = -1; |
| |
| /** Reads a misc. register, including any side-effects the read |
| * might have as defined by the architecture. |
| */ |
| RegVal |
| readMiscReg(int misc_reg) override |
| { |
| return cpu->readMiscReg(misc_reg, 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 (auto &idx: _destMiscRegIdx) { |
| if (idx == misc_reg) |
| return; |
| } |
| |
| _destMiscRegIdx.push_back(misc_reg); |
| _destMiscRegVal.push_back(val); |
| } |
| |
| /** 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.is(MiscRegClass)); |
| return cpu->readMiscReg(reg.index(), 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.is(MiscRegClass)); |
| 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 = thread->noSquashFromTC; |
| thread->noSquashFromTC = true; |
| |
| for (int i = 0; i < _destMiscRegIdx.size(); i++) |
| cpu->setMiscReg( |
| _destMiscRegIdx[i], _destMiscRegVal[i], threadNumber); |
| |
| thread->noSquashFromTC = no_squash_from_TC; |
| } |
| |
| void |
| forwardOldRegs() |
| { |
| |
| for (int idx = 0; idx < numDestRegs(); idx++) { |
| PhysRegIdPtr prev_phys_reg = prevDestIdx(idx); |
| const RegId& original_dest_reg = staticInst->destRegIdx(idx); |
| switch (original_dest_reg.classValue()) { |
| case IntRegClass: |
| setIntRegOperand(staticInst.get(), idx, |
| cpu->readIntReg(prev_phys_reg)); |
| break; |
| case FloatRegClass: |
| setFloatRegOperandBits(staticInst.get(), idx, |
| cpu->readFloatReg(prev_phys_reg)); |
| break; |
| case VecRegClass: |
| setVecRegOperand(staticInst.get(), idx, |
| cpu->readVecReg(prev_phys_reg)); |
| break; |
| case VecElemClass: |
| setVecElemOperand(staticInst.get(), idx, |
| cpu->readVecElem(prev_phys_reg)); |
| break; |
| case VecPredRegClass: |
| setVecPredRegOperand(staticInst.get(), idx, |
| cpu->readVecPredReg(prev_phys_reg)); |
| break; |
| case CCRegClass: |
| setCCRegOperand(staticInst.get(), idx, |
| 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()); |
| } |
| } |
| } |
| /** Traps to handle specified fault. */ |
| void trap(const Fault &fault); |
| |
| 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 cpu->readIntReg(renamedSrcIdx(idx)); |
| } |
| |
| RegVal |
| readFloatRegOperandBits(const StaticInst *si, int idx) override |
| { |
| return cpu->readFloatReg(renamedSrcIdx(idx)); |
| } |
| |
| const TheISA::VecRegContainer& |
| readVecRegOperand(const StaticInst *si, int idx) const override |
| { |
| return cpu->readVecReg(renamedSrcIdx(idx)); |
| } |
| |
| /** |
| * Read destination vector register operand for modification. |
| */ |
| TheISA::VecRegContainer& |
| getWritableVecRegOperand(const StaticInst *si, int idx) override |
| { |
| return cpu->getWritableVecReg(renamedDestIdx(idx)); |
| } |
| |
| RegVal |
| readVecElemOperand(const StaticInst *si, int idx) const override |
| { |
| return cpu->readVecElem(renamedSrcIdx(idx)); |
| } |
| |
| const TheISA::VecPredRegContainer& |
| readVecPredRegOperand(const StaticInst *si, int idx) const override |
| { |
| return cpu->readVecPredReg(renamedSrcIdx(idx)); |
| } |
| |
| TheISA::VecPredRegContainer& |
| getWritableVecPredRegOperand(const StaticInst *si, int idx) override |
| { |
| return cpu->getWritableVecPredReg(renamedDestIdx(idx)); |
| } |
| |
| RegVal |
| readCCRegOperand(const StaticInst *si, int idx) override |
| { |
| return cpu->readCCReg(renamedSrcIdx(idx)); |
| } |
| |
| /** @todo: Make results into arrays so they can handle multiple dest |
| * registers. |
| */ |
| void |
| setIntRegOperand(const StaticInst *si, int idx, RegVal val) override |
| { |
| cpu->setIntReg(renamedDestIdx(idx), val); |
| setResult(val); |
| } |
| |
| void |
| setFloatRegOperandBits(const StaticInst *si, int idx, RegVal val) override |
| { |
| cpu->setFloatReg(renamedDestIdx(idx), val); |
| setResult(val); |
| } |
| |
| void |
| setVecRegOperand(const StaticInst *si, int idx, |
| const TheISA::VecRegContainer& val) override |
| { |
| cpu->setVecReg(renamedDestIdx(idx), val); |
| setResult(val); |
| } |
| |
| void |
| setVecElemOperand(const StaticInst *si, int idx, RegVal val) override |
| { |
| int reg_idx = idx; |
| cpu->setVecElem(renamedDestIdx(reg_idx), val); |
| setResult(val); |
| } |
| |
| void |
| setVecPredRegOperand(const StaticInst *si, int idx, |
| const TheISA::VecPredRegContainer& val) override |
| { |
| cpu->setVecPredReg(renamedDestIdx(idx), val); |
| setResult(val); |
| } |
| |
| void |
| setCCRegOperand(const StaticInst *si, int idx, RegVal val) override |
| { |
| cpu->setCCReg(renamedDestIdx(idx), val); |
| setResult(val); |
| } |
| }; |
| |
| } // namespace o3 |
| } // namespace gem5 |
| |
| #endif // __CPU_O3_DYN_INST_HH__ |
