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ENCLSEADD

Adds a 64-bit memory address to the enclave page cache map (EPCM) tracking for the current enclave, specifically updating the enclave's internal page tracking structures to include the specified address.

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 executing within an enclave (Enclave Mode). Execution outside of an enclave SHALL result in a general protection fault (#GP). It is not supported in compatibility mode.

The EADD leaf is used exclusively with the ENCLS (Execute Enclave Command) instruction. The specific operation is triggered by loading the value EADD into the EAX register before executing ENCLS. Failure to provide the correct leaf value in EAX SHALL cause the instruction to return an error code in EAX rather than performing the memory addition.

The address provided MUST be 4KB page-aligned. If the address is not aligned to a 4KB boundary, the instruction SHALL fail and return an error code in EAX.