计算机组成与结构07-程序的机器级表示：过程.pptx

第3章程序的机器级表示——过程计算机组成与结构2016年4月主讲教师赵欢******@&PointersIA32StackRegionofmemorymanagedwithstackdisciplineGrowstowardloweraddressesRegister%espcontainsloweststackaddressaddressof“top”elementStackPointer:%espStackGrowsDownIncreasingAddressesStack“Top”Stack“Bottom”IA32Stack:PushpushlSrcFetchoperandatSrcDecrement%espby4Writeoperandataddressgivenby%esp-4StackGrowsDownIncreasingAddressesStack“Bottom”StackPointer:%espStack“Top”StackPointer:%espStackGrowsDownIncreasingAddressesStack“Top”Stack“Bottom”IA32Stack:Pop+4poplDestReadvalueataddressgivenby%espIncrement%espby4StorevalueatDest(mustberegister)ProcedureControlFlowUsestacktosupportprocedurecallandreturnProcedurecall:calllabelPushreturnaddressonstackJumptolabelReturnaddress:AddressofthenextinstructionrightaftercallExamplefromdisassembly804854e:e83d060000call8048b90<main>8048553:50pushl%eaxReturnaddress=0x8048553Procedurereturn:retPopaddressfromstackJumptoaddress%esp%esp0x80485530x104%esp%eip%esp%eip0x8048b900x1080x10c0x1100x1040x804854e123ProcedureCallExample0x1080x10c0x1101230x108call8048b90804854e: e83d060000 call8048b90<main>8048553: 50 pushl%eax%eip:programcounter%esp%esp%esp%eip0x104%esp%eip0x80485910x1040x1080x10c0x1100x8048553123ProcedureReturnExample0x1080x10c0x110123ret8048591: c3 ret0x1080x80485530x8048553%eip:programcounter0x104804854e: e83d060000 call8048b90<main>8048553: 50 pushl%eaxStack-.,C,Pascal,JavaCodemustbe“Reentrant”ivenprocedureneededforlimitedtimeFromwhencalledtowhenreturnCalleereturnsbeforecallerdoesStackallocatedinFramesstateforsingleprocedureinstantiationFramePointer:%ebpStackFramesContentsLocalvariablesReturninformationTemporaryspaceManagementSpaceallocatedwhenenterprocedure“Set-up”codeDeallocatedwhenreturn“Finish”codeStackPointer:%espStack“Top”PreviousFrameFrameforproc