Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1570

LLDT—Load Local Descriptor Table Register (Continued)
#GP(selector)
#SS(0)
#NP(selector)
#PF(fault-code)
Real Address Mode Exceptions
#UD
Virtual 8086 Mode Exceptions
#UD
4:268
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.
If a memory operand effective address is outside the SS segment
limit.
If the LDT descriptor is not present.
If a page fault occurs.
The LLDT instruction is not recognized in real address mode.
The LLDT instruction is recognized in virtual 8086 mode.
Volume 4: Base IA-32 Instruction Reference