80386 Programmer's Reference Manual -- Opcode SLDT

SLDT -- Store Local Descriptor Table Register

OpcodeInstructionClocks DescriptionExample
0F 00 /0sldtw r/m16pm=2/2 Store LDTR to EA wordsldtw %cx
sldtw (%ebx,1)
sldtw (%ebx,2)
sldtw (%ebx,%ebp,1)


r/m16 := LDTR;


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.

SLDT is used only in operating system software. It is not used in application programs.

Flags Affected


Protected Mode Exceptions

#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

Real Address Mode Exceptions

Interrupt 6; SLDT is not recognized in Real Address Mode

Virtual 8086 Mode Exceptions

Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault


The operand-size attribute has no effect on the operation of the instruction.

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