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ENCLSEMODT
Enters a software enclave. This instruction initiates the transition from non-enclave mode to enclave mode by saving the current state and jumping to the specified entry point within the enclave.
The table after the description covers what the source and destinations can be.
| source | destination(s) |
|---|---|
| imm | #I |
| reg | #I |
| mN | #I |
DO NOT support LOCK
This instruction is only available when the processor is operating in Long Mode. It SHALL NOT be used in compatibility mode. The execution of ENCLS requires that the processor is not already executing within an enclave.
The ENCLS instruction SHALL fail and return an error code in rax if the enclave is not properly initialized or if the target entry point is invalid. To avoid unexpected execution flow, the programmer MUST verify the return value in rax immediately after the instruction to ensure the transition to the enclave succeeded.