interface 外文学习材料

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1、Native64-bitSubprogramInterfaceforMIPSArchitecturesThisdocumentdescribestheinternalsubprograminterfacefornative64-bitprograms,whichwasintroducedwiththeMIPSproversion6.0com-pilersuite.Weassumesomefamiliaritywiththecurrent32-bitinterfaceconventionsasspecifiedintheMIPSABI(i.e.theMIPSsupplementtothe

2、SVR4ApplicationBinaryInterfacespecification,whichwewillrefertoasthe32-bitABI,astheold32-bitABI,orastheo32ABI).Thisdocumentalsodescribesaproposednew32-bitsubprograminter-face,whichislargelyidenticaltothe64-bitsubprograminterface.Itdif-fersonlyinthatcertaindatatypes(i.e.longandpointer)produce32-bi

3、tdataobjectswhiletheywouldhavebeen64-bitobjectsinthe64-bitABI.ThisABIisgenerallycalledthenew32-bitABI,orthen32ABI.Sincethisdocumentdoesnotdiscusstheinterfaceintermsofthesourcelan-guagetypes,thesedifferencesaregenerallyirrelevant.ThereareothercomponentsofanABIwhichwedonotaddressinthisdocument,sp

4、ecificallythesourcelanguagetypemappingandstoragelayout,theformatusedforobjectfiles,andoperatingsystemcallinter-faces.Thetransitiontonative64-bitcodeontheMIPSR4000andsubsequentMIPSarchitectureprocessorsrequiressubprograminterfacechangesduetothechangesinregisterandaddresssize.Thisspecificationtakesa

5、d-vantageofthistransitiontorevamptheinterfacetoimproveperformanceinanumberofareas.8/21/95SiliconGraphicsComputerSystemsPage2Native64-bitSubprogramInterfaceforMIPSArchitecturesTheprincipalinterfacefor64-bitnativecodeissuperficiallysimilartotheold32-bitABI,withall32-bitobjectsreplacedby64-bitobjec

6、ts.Inparticular,thisimplies:●Allintegerparametersarepromoted(i.e.sign-orzero-extended)to64-bitintegersandpassedinasingleregister.(Nocodeisnormallyrequiredforthepromotion.)●Allpointersandaddressesare64bitobjectsinthe64-bitABI;theyremain32bitobjectsinthen32ABI.●Floatingpointparametersarepassedass

7、ingle-ordouble-precisionaccordingtotheANSICrules.●Allstackparameterslotsbecome64-bitdoublewords,evenforpa-rameterswhicharesmaller,e.g.floatsand32-bitintegers.Inmoredetail,the64-bitnativecallingsequencewillhavethefollowingcharacteri