Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

Vol. 2 3-483
INSTRUCTION SET REFERENCE, A-M
Real-Address Mode Exceptions
#UD Operand is a register.
Virtual-8086 Mode Exceptions
#GP(0) The INVLPG instruction cannot be executed at the virtual-8086
mode.
64-Bit Mode Exceptions
#GP(0) If the current privilege level is not 0.
#UD Operand is a register.