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INSTRUCTION SET REFERENCE
LTRLoad Task Register (Continued)
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 is used to access memory and it contains
a null segment selector.
#GP(selector)If the source selector points to a segment that is not a TSS or to one for a
task that is already busy.
If the selector points to LDT or is beyond the GDT limit.
#NP(selector)If the TSS is marked not present.
#SS(0)
If a memory operand effective address is outside the SS segment limit.
#PF(fault-code)If a page fault occurs.
Real-Address Mode Exceptions
#UD
The LTR instruction is not recognized in real-address mode.
Virtual-8086 Mode Exceptions
#UD
The LTR instruction is not recognized in virtual-8086 mode.
