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SLDT -- Store Local Descriptor Table Register

Opcode      Instruction   Clocks      Description

0F  00 /0   SLDT r/m16    pm=2/2      Store LDTR to EA word

Operation

r/m16 := LDTR;

Description

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

None

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

Notes

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

up: Chapter 17 -- 80386 Instruction Set
prev: SHRD Double Precision Shift Right
next: SMSW Store Machine Status Word