Vol. 2A 3-545
INSTRUCTION SET REFERENCE, A-M
LLDT—Load Local Descriptor Table Register
ELSE LDTR ← INVALID
FI;
Flags Affected
None.
Protected Mode Exceptions
#GP(0) If the current privilege level is not 0.
If a memory operand effective address is outside the CS, DS,
ES, FS, or GS segment limit.
If the DS, ES, FS, or GS register contains a NULL segment
selector.
#GP(selector) If the selector operand does not point into the Global Descriptor
Table or if the entry in the GDT is not a Local Descriptor Table.
Segment selector is beyond GDT limit.
#SS(0) If a memory operand effective address is outside the SS
segment limit.
#NP(selector) If the LDT descriptor is not present.
#PF(fault-code) If a page fault occurs.
#UD If the LOCK prefix is used.
Real-Address Mode Exceptions
#UD The LLDT instruction is not recognized in real-address mode.
Virtual-8086 Mode Exceptions
#UD The LLDT instruction is not recognized in virtual-8086 mode.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
#SS(0) If a memory address referencing the SS segment is in a non-
canonical form.
#GP(0) If the current privilege level is not 0.
If the memory address is in a non-canonical form.
#GP(selector) If the selector operand does not point into the Global Descriptor
Table or if the entry in the GDT is not a Local Descriptor Table.
Segment selector is beyond GDT limit.
#NP(selector) If the LDT descriptor is not present.
