__encls_N(9)

💅 __encls_N — okay so this is the ENCLS encoder for the no-error-code girlies

bestie. welcome to section 9 of the Kernel API Manual, aka the kernel-manpage section, aka where the macro lore lives. today we're talking about __encls_N — a macro that encodes an ENCLS function that doesn't return an error code. that's the whole vibe. no error code, no drama, periodt. ✨

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🎀 SYNOPSIS 🎀

__encls_N (rax , rbx_out , inputs... );

like, look at her. three little slots and she's done. iconic.

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🌸 ARGUMENTS 🌸

• rax — the function number. which ENCLS function are we even doing here. that one. 🫶
• rbx_out — an optional output variable. only if you need it, no pressure.
• inputs — the asm inputs for the function. feed her.

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🦋 DESCRIPTION 🦋

okay so what she actually does: she emits assembly for an ENCLS function that does not return an error code — think ECREATE, that kind of energy. 💅

and here's the key thing, the part you cannot skip: leaves without error codes either succeed or fault. there's no in-between, no "oops here's a return value", none of that. it works or it traps. main character behaviour fr fr.

rbx_out is an optional parameter for use by EDGBRD, which returns the requested value in RBX. so if you're the EDGBRD girlie, that's your slot. iykyk. 🧚

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⭐ RETURN ⭐

• 0 on success 🎉
• trapnr with SGX_ENCLS_FAULT_FLAG set on fault 💀

like i said. succeed or fault. no cap.

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🌈 SEE ALSO 🌈

• Kernel file ./arch/x86/kernel/cpu/sgx/encls.h
• encls_failed(9)
• __encls_ret_N(9)

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lowkey reminder bestie: if it faults you're getting a trapnr back with SGX_ENCLS_FAULT_FLAG set, so check that flag before you assume anything. 🫶

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mwah 💋 that's the page! this little love letter lives in the kernel source tree at ./arch/x86/kernel/cpu/sgx, and it's dated October 2026 — so yeah, she's from the future and she's still serving __encls_N(9). go forth and encode, queen 👑✨