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ENCLUEEXIT

Exits an enclave by transitioning execution to the enclave's exit handler or returning to the calling application.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is only available when the processor is operating within an enclave. Execution of EEXIT outside of an enclave environment results in a general-protection exception (#GP).

The EEXIT instruction performs a synchronous exit from the enclave, meaning it clears the enclave's internal state and restores the processor to the state of the untrusted application. It SHALL be used specifically for planned exits. If an asynchronous event (such as an interrupt or exception) occurs, the processor performs an Asynchronous Enclave Exit (AEX) instead of executing EEXIT. Failure to ensure the enclave state is properly saved before calling EEXIT may lead to data loss within the enclave's private memory region.