some efficient architecture simulation techniques

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1、SomeEfficientArchitectureSimulationTechniquesRobertBedichekDepartmentofComputerScience,FR-35UniversityofWashingtonSeattle,Washington98195robertb@cs.washington.eduABSTRACTAnefficientsimulatorfortheMotorola88000attheISA(InstructionSetArchitecture)levelisdescribed.Bytranslatinginstructionsontheflyt

2、oaquick-to-executeformweachieveanaverageratioof20simulatorhostinstructionsexecutedpersimulatedinstruction.Lazyallocationofmemoryallowslargememoriestobemodelledwithlowstart-uptime.Wedescribeourexperienceusingthesimulatortodevelopworkstationsoftware.Thesimulator’sspeedandextensiveI/Odevicemodellin

3、gmadeitpossibleforustointeractivelydebugand®testaUNIXkernelanddiagnosticsoftwarewellbeforethehardwarewasavailable.Exten-sionstocloselymodelcachesandmultiprocessorsaresketched.1.IntroductionWepresenttechniquesforbuildingahighspeedarchitecturesimulatorfortheMotorola88000CPU[1]andCMMU(CacheandMemor

4、yManagementUnit)[2].Thesemethodscanbeusedforsimulationofotherarchitectures,includingCISCs.Thisworkwasdonewhiletheauthorwasat®TektronixandsupportedthedevelopmentoftheXD88workstationseries.Theconceptsdescribedbelowareimplementedinasimulatorthatrunson68020-basedTektronixworkstations.Ona2.5MIPSworks

5、tationthesimulatorexecutesroughly130,00088000instructionspersecond.Thesimulatormodelsthe88100CPU,uptoeight88200CMMUs,andanumberofI/Odevices.Thesimulatorhasahumaninterfacethatgivesprogrammerssymbolicdebuggingfacilities.Thisinterface,calledthefront-end,isderivedfromdbx.Dbxisatoolnormallyusedfordeb

6、uggingprogramsthatrununderUNIX.®Thesimulatorwasusedtodebugpiecesofdiagnosticcode,bootROMs,aSystemVUNIXkernel,andothersoftware.Section2explainswhywebuiltoursimulator.Section3givesanoverviewofthe88000architecture.Sections4through6describeoursimulator.Sometechnicaladvantagesofusingsuchasimulatorare

7、pointedoutinsection7.Weexplainournot-very-prettysolutiontowritingthisinCinsection8.Ourexperiencewiththesimulatorisdiscussedinsection9.Section10sketchesextensionstothesimulator.2.MotivationWhenCPUarchitectsdesignanewmachine,t