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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode MOV Special Registers</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="MOV.htm"> MOV Move Data</A><BR><B>next:</B><A HREF="MOVS.htm"> MOVS/MOVSB/MOVSW/MOVSD Move Data from String to String</A><P><HR><P><H1>MOV -- Move to/from Special Registers</H1><PRE>Opcode Instruction Clocks Description0F 20 /r MOV r32,CR0/CR2/CR3 6 Move (control register) to (register)0F 22 /r MOV CR0/CR2/CR3,r32 10/4/5 Move (register) to (control register)0F 21 /r MOV r32,DR0 -- 3 22 Move (debug register) to (register)0F 21 /r MOV r32,DR6/DR7 14 Move (debug register) to (register)0F 23 /r MOV DR0 -- 3,r32 22 Move (register) to (debug register)0F 23 /r MOV DR6/DR7,r32 16 Move (register) to (debug register)0F 24 /r MOV r32,TR6/TR7 12 Move (test register) to (register)0F 26 /r MOV TR6/TR7,r32 12 Move (register) to (test register)</PRE><H2>Operation</H2><PRE>DEST := SRC;</PRE><H2>Description</H2>The above forms of MOV store or load the following special registers inor from a general purpose register:<UL> <LI> Control registers CR0, CR2, and CR3 <LI> Debug Registers DR0, DR1, DR2, DR3, DR6, and DR7 <LI> Test Registers TR6 and TR7</UL>32-bit operands are always used with these instructions, regardless of theoperand-size attribute.<H2>Flags Affected</H2>OF, SF, ZF, AF, PF, and CF are undefined<H2>Protected Mode Exceptions</H2>#GP(0) if the current privilege level is not 0<H2>Real Address Mode Exceptions</H2>None<H2>Virtual 8086 Mode Exceptions</H2>#GP(0) if instruction execution is attempted<H2>Notes</H2>The instructions must be executed at privilege level 0 or in real-addressmode; otherwise, a protection exception will be raised.<P>The reg field within the ModRM byte specifies which of the specialregisters in each category is involved. The two bits in the field arealways 11. The r/m field specifies the general register involved.<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="MOV.htm"> MOV Move Data</A><BR><B>next:</B><A HREF="MOVS.htm"> MOVS/MOVSB/MOVSW/MOVSD Move Data from String to String</A></BODY>?? 快捷鍵說明
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