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Diffstat (limited to 'cpu/base_dyn_inst.hh')
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diff --git a/cpu/base_dyn_inst.hh b/cpu/base_dyn_inst.hh new file mode 100644 index 000000000..7651b517e --- /dev/null +++ b/cpu/base_dyn_inst.hh @@ -0,0 +1,617 @@ +/* + * Copyright (c) 2001-2004 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 __BASE_DYN_INST_HH__ +#define __BASE_DYN_INST_HH__ + +#include <vector> +#include <string> + +#include "base/fast_alloc.hh" +#include "base/trace.hh" + +#include "cpu/static_inst.hh" +#include "cpu/beta_cpu/comm.hh" +#include "cpu/full_cpu/bpred_update.hh" +#include "mem/functional_mem/main_memory.hh" +#include "cpu/full_cpu/spec_memory.hh" +#include "cpu/inst_seq.hh" +#include "cpu/full_cpu/op_class.hh" +#include "cpu/full_cpu/spec_state.hh" + +/** + * @file + * Defines a dynamic instruction context. + */ + +namespace Trace { + class InstRecord; +}; + +class BaseInst +{ +}; + +template <class Impl> +class BaseDynInst : public FastAlloc +{ + public: + // Typedef for the CPU. + typedef typename Impl::FullCPU FullCPU; + + //Typedef to get the ISA. + typedef typename Impl::ISA ISA; + + /// Binary machine instruction type. + typedef typename ISA::MachInst MachInst; + /// Memory address type. + typedef typename ISA::Addr Addr; + /// Logical register index type. + typedef typename ISA::RegIndex RegIndex; + /// Integer register index type. + typedef typename ISA::IntReg IntReg; + + enum { + MaxInstSrcRegs = ISA::MaxInstSrcRegs, //< Max source regs + MaxInstDestRegs = ISA::MaxInstDestRegs, //< Max dest regs + }; + + StaticInstPtr<ISA> staticInst; + + //////////////////////////////////////////// + // + // INSTRUCTION EXECUTION + // + //////////////////////////////////////////// + Trace::InstRecord *traceData; + +// void setCPSeq(InstSeqNum seq); + + template <class T> + Fault read(Addr addr, T &data, unsigned flags); + + template <class T> + Fault write(T data, Addr addr, unsigned flags, + uint64_t *res); + + + IntReg *getIntegerRegs(void); + FunctionalMemory *getMemory(void); + + void prefetch(Addr addr, unsigned flags); + void writeHint(Addr addr, int size, unsigned flags); + Fault copySrcTranslate(Addr src); + Fault copy(Addr dest); + + public: + /** Is this instruction valid. */ + bool valid; + + /** The sequence number of the instruction. */ + InstSeqNum seqNum; + + /** How many source registers are ready. */ + unsigned readyRegs; + + /** Can this instruction issue. */ + bool canIssue; + + /** Has this instruction issued. */ + bool issued; + + /** Has this instruction executed (or made it through execute) yet. */ + bool executed; + + /** Can this instruction commit. */ + bool canCommit; + + /** Is this instruction squashed. */ + bool squashed; + + /** Is this instruction squashed in the instruction queue. */ + bool squashedInIQ; + + /** Is this a recover instruction. */ + bool recoverInst; + + /** Is this a thread blocking instruction. */ + bool blockingInst; /* this inst has called thread_block() */ + + /** Is this a thread syncrhonization instruction. */ + bool threadsyncWait; + + /** If the BTB missed. */ + bool btbMissed; + + /** The thread this instruction is from. */ + short threadNumber; + + /** If instruction is speculative. */ + short specMode; + + /** data address space ID, for loads & stores. */ + short asid; + + /** Pointer to the FullCPU object. */ + FullCPU *cpu; + + /** Pointer to the exec context. Will not exist in the final version. */ + ExecContext *xc; + + /** The kind of fault this instruction has generated. */ + Fault fault; + + /** The effective virtual address (lds & stores only). */ + Addr effAddr; + + /** The effective physical address. */ + Addr physEffAddr; + + /** Effective virtual address for a copy source. */ + Addr copySrcEffAddr; + + /** Effective physical address for a copy source. */ + Addr copySrcPhysEffAddr; + + /** The memory request flags (from translation). */ + unsigned memReqFlags; + + /** The size of the data to be stored. */ + int storeSize; + + /** The data to be stored. */ + IntReg storeData; + + /** Result of this instruction, if an integer. */ + uint64_t intResult; + + /** Result of this instruction, if a float. */ + float floatResult; + + /** Result of this instruction, if a double. */ + double doubleResult; + + /** PC of this instruction. */ + Addr PC; + + /** Next non-speculative PC. It is not filled in at fetch, but rather + * once the target of the branch is truly known (either decode or + * execute). + */ + Addr nextPC; + + /** Predicted next PC. */ + Addr predPC; + + /** Count of total number of dynamic instructions. */ + static int instcount; + + /** Did this instruction do a spec write? */ + bool specMemWrite; + + private: + /** Physical register index of the destination registers of this + * instruction. + */ + PhysRegIndex _destRegIdx[MaxInstDestRegs]; + + /** Physical register index of the source registers of this + * instruction. + */ + PhysRegIndex _srcRegIdx[MaxInstSrcRegs]; + + /** Whether or not the source register is ready. */ + bool _readySrcRegIdx[MaxInstSrcRegs]; + + /** Physical register index of the previous producers of the + * architected destinations. + */ + PhysRegIndex _prevDestRegIdx[MaxInstDestRegs]; + + public: + /** BaseDynInst constructor given a binary instruction. */ + BaseDynInst(MachInst inst, Addr PC, Addr Pred_PC, InstSeqNum seq_num, + FullCPU *cpu); + + /** BaseDynInst constructor given a static inst pointer. */ + BaseDynInst(StaticInstPtr<ISA> &_staticInst); + + /** BaseDynInst destructor. */ + ~BaseDynInst(); + +#if 0 + Fault + mem_access(MemCmd cmd, // Read or Write access cmd + Addr addr, // virtual address of access + void *p, // input/output buffer + int nbytes); // access size +#endif + + void + trace_mem(Fault fault, // last fault + MemCmd cmd, // last command + Addr addr, // virtual address of access + void *p, // memory accessed + int nbytes); // access size + + /** Dumps out contents of this BaseDynInst. */ + void dump(); + + /** Dumps out contents of this BaseDynInst into given string. */ + void dump(std::string &outstring); + + /** Returns the fault type. */ + 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. + */ + bool doneTargCalc() { return false; } + + /** Returns the calculated target of the branch. */ + Addr readCalcTarg() { return nextPC; } + + Addr readNextPC() { return nextPC; } + + /** Set the predicted target of this current instruction. */ + void setPredTarg(Addr predicted_PC) { predPC = predicted_PC; } + + /** Returns the predicted target of the branch. */ + Addr readPredTarg() { return predPC; } + + /** Returns whether the instruction was predicted taken or not. */ + bool predTaken() { +// DPRINTF(FullCPU, "PC: %08p\n", PC); +// DPRINTF(FullCPU, "predPC: %08p\n", predPC); + + return( predPC != (PC + sizeof(MachInst) ) ); + } + + /** Returns whether the instruction mispredicted. */ + bool mispredicted() { return (predPC != nextPC); } + + // + // 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 isInstPrefetch() const { return staticInst->isInstPrefetch(); } + bool isDataPrefetch() const { return staticInst->isDataPrefetch(); } + bool isCopy() const { return staticInst->isCopy(); } + bool isInteger() const { return staticInst->isInteger(); } + bool isFloating() const { return staticInst->isFloating(); } + 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 isThreadSync() const { return staticInst->isThreadSync(); } + bool isSerializing() const { return staticInst->isSerializing(); } + bool isMemBarrier() const { return staticInst->isMemBarrier(); } + bool isWriteBarrier() const { return staticInst->isWriteBarrier(); } + bool isNonSpeculative() const { return staticInst->isNonSpeculative(); } + + int8_t numSrcRegs() const { return staticInst->numSrcRegs(); } + int8_t numDestRegs() const { return staticInst->numDestRegs(); } + + // 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(); } + + /** Returns the logical register index of the i'th destination register. */ + RegIndex destRegIdx(int i) const + { + return staticInst->destRegIdx(i); + } + + /** Returns the logical register index of the i'th source register. */ + RegIndex srcRegIdx(int i) const + { + return staticInst->srcRegIdx(i); + } + + /** Returns the physical register index of the i'th destination + * register. + */ + PhysRegIndex renamedDestRegIdx(int idx) const + { + return _destRegIdx[idx]; + } + + /** Returns the physical register index of the i'th source register. */ + PhysRegIndex renamedSrcRegIdx(int idx) const + { + return _srcRegIdx[idx]; + } + + bool isReadySrcRegIdx(int idx) const + { + return _readySrcRegIdx[idx]; + } + + /** Returns the physical register index of the previous physical register + * that remapped to the same logical register index. + */ + PhysRegIndex prevDestRegIdx(int idx) const + { + return _prevDestRegIdx[idx]; + } + + /** Renames a destination register to a physical register. Also records + * the previous physical register that the logical register mapped to. + */ + void renameDestReg(int idx, + PhysRegIndex renamed_dest, + PhysRegIndex previous_rename) + { + _destRegIdx[idx] = renamed_dest; + _prevDestRegIdx[idx] = previous_rename; + } + + /** 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, PhysRegIndex renamed_src) + { + _srcRegIdx[idx] = renamed_src; + } + + //Push to .cc file. + /** Records that one of the source registers is ready. */ + void markSrcRegReady() + { + ++readyRegs; + if(readyRegs == numSrcRegs()) { + canIssue = true; + } + } + + void markSrcRegReady(RegIndex src_idx) + { + ++readyRegs; + + _readySrcRegIdx[src_idx] = 1; + + if(readyRegs == numSrcRegs()) { + canIssue = true; + } + } + + /** Sets this instruction as ready to issue. */ + void setCanIssue() { canIssue = true; } + + /** Returns whether or not this instruction is ready to issue. */ + bool readyToIssue() const { return canIssue; } + + /** Sets this instruction as issued from the IQ. */ + void setIssued() { issued = true; } + + /** Returns whether or not this instruction has issued. */ + bool isIssued() { return issued; } + + /** Sets this instruction as executed. */ + void setExecuted() { executed = true; } + + /** Returns whether or not this instruction has executed. */ + bool isExecuted() { return executed; } + + /** Sets this instruction as ready to commit. */ + void setCanCommit() { canCommit = true; } + + /** Returns whether or not this instruction is ready to commit. */ + bool readyToCommit() const { return canCommit; } + + /** Sets this instruction as squashed. */ + void setSquashed() { squashed = true; } + + /** Returns whether or not this instruction is squashed. */ + bool isSquashed() const { return squashed; } + + /** Sets this instruction as squashed in the IQ. */ + void setSquashedInIQ() { squashedInIQ = true; } + + /** Returns whether or not this instruction is squashed in the IQ. */ + bool isSquashedInIQ() { return squashedInIQ; } + + /** Returns the opclass of this instruction. */ + OpClass opClass() const { return staticInst->opClass(); } + + /** Returns whether or not the BTB missed. */ + bool btbMiss() const { return btbMissed; } + + /** Returns the branch target address. */ + Addr branchTarget() const { return staticInst->branchTarget(PC); } + + // 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). + + uint64_t readIntReg(StaticInst<ISA> *si, int idx) + { + return cpu->readIntReg(_srcRegIdx[idx]); + } + + float readFloatRegSingle(StaticInst<ISA> *si, int idx) + { + return cpu->readFloatRegSingle(_srcRegIdx[idx]); + } + + double readFloatRegDouble(StaticInst<ISA> *si, int idx) + { + return cpu->readFloatRegDouble(_srcRegIdx[idx]); + } + + uint64_t readFloatRegInt(StaticInst<ISA> *si, int idx) + { + return cpu->readFloatRegInt(_srcRegIdx[idx]); + } + /** @todo: Make results into arrays so they can handle multiple dest + * registers. + */ + void setIntReg(StaticInst<ISA> *si, int idx, uint64_t val) + { + cpu->setIntReg(_destRegIdx[idx], val); + intResult = val; + } + + void setFloatRegSingle(StaticInst<ISA> *si, int idx, float val) + { + cpu->setFloatRegSingle(_destRegIdx[idx], val); + floatResult = val; + } + + void setFloatRegDouble(StaticInst<ISA> *si, int idx, double val) + { + cpu->setFloatRegDouble(_destRegIdx[idx], val); + doubleResult = val; + } + + void setFloatRegInt(StaticInst<ISA> *si, int idx, uint64_t val) + { + cpu->setFloatRegInt(_destRegIdx[idx], val); + intResult = val; + } + + /** Read the PC of this instruction. */ + Addr readPC() { return PC; } + + /** Set the next PC of this instruction (its actual target). */ + void setNextPC(uint64_t val) { nextPC = val; } + +// bool misspeculating() { return cpu->misspeculating(); } + ExecContext *xcBase() { return xc; } +}; + +template<class Impl> +template<class T> +inline Fault +BaseDynInst<Impl>::read(Addr addr, T &data, unsigned flags) +{ + MemReqPtr req = new MemReq(addr, xc, sizeof(T), flags); + req->asid = asid; + + fault = cpu->translateDataReadReq(req); + + // Record key MemReq parameters so we can generate another one + // just like it for the timing access without calling translate() + // again (which might mess up the TLB). + effAddr = req->vaddr; + physEffAddr = req->paddr; + memReqFlags = req->flags; + + /** + * @todo + * Replace the disjoint functional memory with a unified one and remove + * this hack. + */ +#ifndef FULL_SYSTEM + req->paddr = req->vaddr; +#endif + + if (fault == No_Fault) { + fault = cpu->read(req, data); + } + else { + // Return a fixed value to keep simulation deterministic even + // along misspeculated paths. + data = (T)-1; + } + + if (traceData) { + traceData->setAddr(addr); + traceData->setData(data); + } + + return fault; +} + +template<class Impl> +template<class T> +inline Fault +BaseDynInst<Impl>::write(T data, Addr addr, unsigned flags, uint64_t *res) +{ + if (traceData) { + traceData->setAddr(addr); + traceData->setData(data); + } + + storeSize = sizeof(T); + storeData = data; + if (specMode) + specMemWrite = true; + + MemReqPtr req = new MemReq(addr, xc, sizeof(T), flags); + + req->asid = asid; + + fault = cpu->translateDataWriteReq(req); + + // Record key MemReq parameters so we can generate another one + // just like it for the timing access without calling translate() + // again (which might mess up the TLB). + effAddr = req->vaddr; + physEffAddr = req->paddr; + memReqFlags = req->flags; + + /** + * @todo + * Replace the disjoint functional memory with a unified one and remove + * this hack. + */ +#ifndef FULL_SYSTEM + req->paddr = req->vaddr; +#endif + + if (fault == No_Fault) { + fault = cpu->write(req, data); + } + + if (res) { + // always return some result to keep misspeculated paths + // (which will ignore faults) deterministic + *res = (fault == No_Fault) ? req->result : 0; + } + + return fault; +} + +#endif // __DYN_INST_HH__ |