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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode PUSHF</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="PUSHA.htm"> PUSHA/PUSHAD Push all General Registers</A><BR><B>next:</B><A HREF="RCL.htm"> RCL/RCR/ROL/ROR Rotate</A><P><HR><P><H1>PUSHF/PUSHFD -- Push Flags Register onto the Stack</H1><PRE>Opcode Instruction Clocks Description9C PUSHF 4 Push FLAGS9C PUSHFD 4 Push EFLAGS</PRE><H2>Operation</H2><PRE>IF OperandSize = 32THEN push(EFLAGS);ELSE push(FLAGS);FI;</PRE><H2>Description</H2>PUSHF decrements the stack pointer by 2 and copies the FLAGSregister to the new top of stack; PUSHFD decrements the stack pointer by4, and the 80386 EFLAGS register is copied to the new top of stackwhich is pointed to by SS:eSP. Refer to <A HREF="c02.htm">Chapter 2</A> and <A HREF="c04.htm">Chapter 4</A> for information on the EFLAGS register.<H2>Flags Affected</H2>None<H2>Protected Mode Exceptions</H2>#SS(0) if the new value of eSP is outside the stack segment boundaries<H2>Real Address Mode Exceptions</H2>None; the 80386 shuts down due to a lack of stack space<H2>Virtual 8086 Mode Exceptions</H2>#GP(0) fault if IOPL is less than 3, to permit emulation<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="PUSHA.htm"> PUSHA/PUSHAD Push all General Registers</A><BR><B>next:</B><A HREF="RCL.htm"> RCL/RCR/ROL/ROR Rotate</A></BODY>⌨️ 快捷键说明
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