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CMU CS 15213 - Lecture

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Machine-Level Programming III: Procedures Sept. 14, 2007IA32 StackIA32 Stack PushingIA32 Stack PoppingProcedure Control FlowProcedure Call ExampleProcedure Return ExampleStack-Based LanguagesCall Chain ExampleStack FramesStack OperationSlide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21IA32/Linux Stack FrameRevisiting swapSlide 24swap Setup #1swap Setup #2swap Setup #3Effect of swap Setupswap Finish #1swap Finish #2swap Finish #3swap Finish #4Register Saving ConventionsSlide 34IA32/Linux Register UsageRecursive FactorialRfact Stack SetupRfact BodyRfact RecursionRfact ResultRfact CompletionPointer CodeCreating & Initializing PointerPassing PointerUsing PointerIA 32 Procedure Summaryx86-64 General Purpose Registersx86-64 Register Conventionsx86-64 Registersx86-64 Long Swapx86-64 Locals in the Red Zonex86-64 NonLeaf without Stack Framex86-64 Call using Jumpx86-64 Stack Frame ExampleUnderstanding x86-64 Stack FrameStack OperationsInteresting Features of Stack Framex86-64 Procedure SummaryMachine-Level Programming III:ProceduresSept. 14, 2007Machine-Level Programming III:ProceduresSept. 14, 2007IA32IA32stack disciplineRegister saving conventionsCreating pointers to local variablesx86-64x86-64Argument passing in registersMinimizing stack usageUsing stack pointer as only referenceclass06.ppt15-213“The course that gives CMU its Zip!”15-213, F’07– 2 –15-213, F’07IA32 StackIA32 StackRegion of memory managed with stack disciplineGrows toward lower addressesRegister %esp indicates lowest stack addressaddress of top elementStackPointer%espStack GrowsDownIncreasingAddressesStack “Top”Stack “Bottom”– 3 –15-213, F’07IA32 Stack PushingIA32 Stack PushingPushingPushingpushl SrcFetch operand at SrcDecrement %esp by 4Write operand at address given by %espStack GrowsDownIncreasingAddressesStack “Top”Stack “Bottom”StackPointer%esp-4– 4 –15-213, F’07IA32 Stack PoppingIA32 Stack PoppingPoppingPoppingpopl DestRead operand at address given by %espIncrement %esp by 4Write to DestStackPointer%espStack GrowsDownIncreasingAddressesStack “Top”Stack “Bottom”+4– 5 –15-213, F’07Procedure Control FlowProcedure Control FlowUse stack to support procedure call and returnProcedure call:Procedure call:call labelPush return address on stack; Jump to labelReturn address valueReturn address valueAddress of instruction beyond callExample from disassembly 804854e: e8 3d 06 00 00 call 8048b90 <main> 8048553: 50 pushl %eaxReturn address = 0x8048553Procedure return:Procedure return:ret Pop address from stack; Jump to address– 6 –15-213, F’07%esp%eip%esp%eip 0x804854e0x1080x1080x10c0x1100x1040x804854e0x8048553123Procedure Call ExampleProcedure Call Example0x1080x10c0x1101230x108call 8048b90804854e: e8 3d 06 00 00 call 8048b90 <main>8048553: 50 pushl %eax0x8048b900x104%eip is program counter– 7 –15-213, F’07%esp%eip0x104%esp%eip 0x80485910x80485910x1040x1040x1080x10c0x1100x8048553123Procedure Return ExampleProcedure Return Example0x1080x10c0x110123ret8048591: c3 ret0x108%eip is program counter0x80485530x8048553– 8 –15-213, F’07Stack-Based LanguagesStack-Based LanguagesLanguages that Support RecursionLanguages that Support Recursione.g., C, Pascal, JavaCode must be “Reentrant”Multiple simultaneous instantiations of single procedureNeed some place to store state of each instantiationArgumentsLocal variablesReturn pointerStack DisciplineStack DisciplineState for given procedure needed for limited timeFrom when called to when returnCallee returns before caller doesStack Allocated in Stack Allocated in FramesFramesstate for single procedure instantiation– 9 –15-213, F’07Call Chain ExampleCall Chain ExampleCode StructureCode Structureyoo(…){••who();••}who(…){• • •amI();• • •amI();• • •}amI(…){••amI();••}yoowhoamIamIamICall ChainProcedure amI recursiveamI– 10 –15-213, F’07StackPointer%espyoowhoprocFramePointer%ebpStack“Top”Stack FramesStack FramesContentsContentsLocal variablesReturn informationTemporary spaceManagementManagementSpace allocated when enter procedure“Set-up” codeDeallocated when return“Finish” codePointersPointersStack pointer %esp indicates stack topFrame pointer %ebp indicates start of current frameamI– 11 –15-213, F’07StackPointer%espyoo•••FramePointer%ebpStack OperationStack OperationyooCall Chainyoo(…){••who();••}– 12 –15-213, F’07StackPointer%espyoowho•••FramePointer%ebpStack OperationStack OperationyoowhoCall Chainwho(…){• • •amI();• • •amI();• • •}– 13 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoamICall ChainamI(…){••amI();••}– 14 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoamICall ChainamI(…){••amI();••}amIamI– 15 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoamICall ChainamI(…){••amI();••}amIamIamIamI– 16 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoamICall ChainamI(…){••amI();••}amIamIamI– 17 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoamICall ChainamI(…){••amI();••}amIamI– 18 –15-213, F’07StackPointer%espyoowho•••FramePointer%ebpStack OperationStack OperationyoowhoCall Chainwho(…){• • •amI();• • •amI();• • •}amIamIamI– 19 –15-213, F’07StackPointer%espyoowhoamI•••FramePointer%ebpStack OperationStack OperationyoowhoCall ChainamI(…){••••}amIamIamIamI– 20 –15-213, F’07StackPointer%espyoowho•••FramePointer%ebpStack OperationStack OperationyoowhoCall Chainwho(…){• • •amI();• • •amI();• • •}amIamIamIamI– 21 –15-213, F’07yoo(…){••who();••}StackPointer%espyoo•••FramePointer%ebpStack OperationStack OperationyoowhoCall ChainamIamIamIamI– 22 –15-213, F’07IA32/Linux Stack FrameIA32/Linux Stack FrameCurrent Stack Frame (“Top” Current Stack Frame (“Top” to Bottom)to Bottom)Parameters for function about to call“Argument build”Local variablesIf


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