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AMD64 Technology 24594 Rev. 3.10 February 2005LEAVEDelete Procedure Stack FrameReleases a stack frame created by a previous ENTER instruction. To release theframe, it copies the frame pointer (in the rBP register) to the stack pointer register(rSP), and then pops the old frame pointer from the stack into the rBP register, thusrestoring the stack frame of the calling procedure.The 32-bit LEAVE instruction is equivalent to the following 32-bit operation:MOV ESP,EBPPOP EBPTo return program control to the calling procedure, execute a RET instruction afterthe LEAVE instruction.In 64-bit mode, the LEAVE operand size defaults to 64 bits, and there is no prefixavailable for encoding a 32-bit operand size.Mnemonic Opcode DescriptionLEAVELEAVELEAVERelated InstructionsENTERrFLAGS AffectedNoneC9C9C9Set the stack pointer register SP to the value in the BP registerand pop BP.Set the stack pointer register ESP to the value in the EBP registerand pop EBP.(No prefix for encoding this in 64-bit mode.)Set the stack pointer register RSP to the value in the RBP registerand pop RBP.184 LEAVE
24594 Rev. 3.10 February 2005 AMD64 TechnologyExceptionsException RealVirtual8086 Protected Cause of ExceptionStack, #SS X X X A memory address exceeded the stack segment limit or was noncanonical.Page fault, #PF X X A page fault resulted from the execution of the instruction.Alignment check, #AC X X An unaligned memory reference was performed while alignmentchecking was enabled.LEAVE 185
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