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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode LEAVE</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="LEA.htm"> LEA Load Effective Address</A><BR> <B>next:</B><A HREF="LGDT.htm"> LGDT/LIDT Load Global/Interrupt Descriptor Table Register</A><P><HR><P><H1>LEAVE -- High Level Procedure Exit</H1><PRE>Opcode Instruction Clocks DescriptionC9 LEAVE 4 Set SP to BP, then pop BPC9 LEAVE 4 Set ESP to EBP, then pop EBP</PRE><H2>Operation</H2><PRE>IF StackAddrSize = 16THEN SP := BP;ELSE (* StackAddrSize = 32 *) ESP := EBP;FI;IF OperandSize = 16THEN BP := Pop();ELSE (* OperandSize = 32 *) EBP := Pop();FI;</PRE><H2>Description</H2>LEAVE reverses the actions of the <A HREF="ENTER.htm">ENTER</A> instruction. By copying theframe pointer to the stack pointer, LEAVE releases the stack space usedby a procedure for its local variables. The old frame pointer is poppedinto BP or EBP, restoring the caller's frame. A subsequent <A HREF="RET.htm">RET</A>instruction removes any arguments pushed onto the stack of the exitingprocedure.<H2>Flags Affected</H2>None<H2>Protected Mode Exceptions</H2>#SS(0) if BP does not point to a location within the limits of the currentstack segment<H2>Real Address Mode Exceptions</H2>Interrupt 13 if any part of the operand would lie outside of the effectiveaddress space from 0 to 0FFFFH<H2>Virtual 8086 Mode Exceptions</H2>Same exceptions as in Real Address Mode<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="LEA.htm"> LEA Load Effective Address</A><BR> <B>next:</B><A HREF="LGDT.htm"> LGDT/LIDT Load Global/Interrupt Descriptor Table Register</A></BODY>?? 快捷鍵說明
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