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SLDT.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode SLDT</TITLE>
</HEAD>
<BODY STYLE="width:80ch">
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="SHRD.htm"> SHRD Double Precision Shift Right</A><BR>
<B>next:</B><A HREF="SMSW.htm"> SMSW Store Machine Status Word</A>
<P>
<HR>
<P>
<H1>SLDT -- Store Local Descriptor Table Register</H1>
<PRE>
Opcode Instruction Clocks Description
0F 00 /0 SLDT r/m16 pm=2/2 Store LDTR to EA word
</PRE>
<H2>Operation</H2>
<PRE>
r/m16 := LDTR;
</PRE>
<H2>Description</H2>
SLDT stores the Local Descriptor Table Register (LDTR) in the two-byte
register or memory location indicated by the effective address operand.
This register is a selector that points into the Global Descriptor Table.
<P>
SLDT is used only in operating system software. It is not used in
application programs.
<H2>Flags Affected</H2>
None
<H2>Protected Mode Exceptions</H2>
#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal
memory operand effective address in the CS, DS, ES, FS, or GS segments;
#SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page
fault
<H2>Real Address Mode Exceptions</H2>
Interrupt 6; SLDT is not recognized in Real Address Mode
<H2>Virtual 8086 Mode Exceptions</H2>
Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault
<H2>Notes</H2>
The operand-size attribute has no effect on the operation of the
instruction.
<P>
<HR>
<P>
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="SHRD.htm"> SHRD Double Precision Shift Right</A><BR>
<B>next:</B><A HREF="SMSW.htm"> SMSW Store Machine Status Word</A>
</BODY>