STUI
Set User Interrupt Flag
stableVMJITAOTinstruction
Encodings
| Opcode | Instruction | Op/En | 64-bit | Compat/Legacy | Description |
|---|---|---|---|---|---|
F3 0F 01 EF | STUI | ZO | Valid | Invalid | Set user interrupt flag. |
Measured cost
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Description
STUI sets the user interrupt flag (UIF). Its effect takes place immediately; a user interrupt may be delivered on the instruction boundary following STUI. (This is in contrast with STI, whose effect is delayed by one instruction).
An execution of STUI inside a transactional region causes a transactional abort; the abort loads EAX as it would have had it been due to an execution of STI.
Operation
UIF := 1;Flags affected
None.
Exceptions
Protected mode
#UD | The STUI instruction is not recognized in protected mode. |
Real address mode
#UD | The STUI instruction is not recognized in real-address mode. |
Virtual-8086 mode
#UD | The STUI instruction is not recognized in virtual-8086 mode. |
Compatibility mode
#UD | The STUI instruction is not recognized in compatibility mode. |
64-bit mode
#UD | If the LOCK prefix is used. If executed inside an enclave. If CR4.UINTR = 0. If CPUID.07H.00H:EDX.UINTR[5] = 0. |