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1、ABSTRACTABSTRACTBinarytranslationtechnologyisthecoretechnologyofsoftwareportableacrossplatformsandhardwaresimulation,whichenablestheexecutableobjectfileofdifferenthardware/softwareplatformstobeexecutedonanotherone,andisconvenientforhardwarelogicverificationandsystemso
2、ftwaredebuggingaswell.Dynamicbinarytranslationtechnologyiscurrentlythemostpopularbinarytranslationtechnology.Ittakesthestrategyofreal-timetranslationandexecutiontotransformthebinarycodeoftheobjectCPUarchitectureintothelocalone,andequipswithcharacteristicsofreal-timetr
3、anslation,rapidresponse,multi-sourcesandmulti-targetsandsoon.Dynamicbinarytranslation,however,isstillonthestageofcontinuousdevelopmentandneededtobeperfected.Forexample,combineswithdifferenthardwaretechnologiestoacceleratetheexecutionspeedoftheemulator,introducesnovela
4、ndefficientoptimizationalgorithmtoimprovequalityoftranslatedcodeetc.Howtotranslateandoptimizeitfasthasbeenthehotresearchpointforalongtime.QEMUisatypicaldynamicbinarytranslationsystem,itusesdynamicbinarytranslationtechnologytoachievereal-timetranslationandexecutiononth
5、etargetbinarycode,andhavemulti-sourcesandmulti-targets,rapidtranslation,supportself-referencing/self-modifyingcodeandothercharacteristics.Comparedtothefasttranslation,however,thehostcodegeneratedbyQEMUoftenexistmanyunnecessarymemoryaccessandregistermoveoperations,thes
6、ewillleadtosignificantexecutionoverhead.Besidesthat,QEMUtranslates,optimizesandexecutestheobjectbinarycodeinaserializedway,whichleadsmanyadvancedoptimizationalgorithmstobehardlyused,becauseofthesealgorithmsdooptimizationneedsfortime-consumingoptimizationoperation,ando
7、ptimizationoverheadoftenoutweighsthebenefits.ThepaperstudiestheTCGtranslationengineindetails,andputforwards,basedontheresearch,amodelofhotspotcodedetectionanddynamicoptimization:combinationwithmulti-coresofprocessesandmulti-threadstechnologies,implementationtodetectth
8、ehotspotcodeofQEMUthroughcodeinstrumentationandNETalgorithm,andII万方数据ABSTRACTmergethemintoasuperblock.Whenasuperblockisgener
