Function tee_command 

pub fn tee_command(attr: TokenStream, item: TokenStream) -> TokenStream

Generates two companion functions for a TA command handler.

function_name_dispatched (TA side, default, #[cfg(feature = "ta")]): unpacks ::optee_utee::Parameters via the [TeeParam] trait, calls the original function, and flushes any output or inout values back into their slots.

call_function_name (CA side, #[cfg(feature = "ca")]): packs arguments via [TeeParam], calls invoke_command, then reads output slots back.

The original function body is emitted unchanged.

Codec attribute

When any parameter or return type implements TeeParam<C> for a serialized codec, you must specify the codec:

#[tee_command(codec = PostcardCodec, ctx)]
fn my_handler(ctx: &mut Context, config: MyConfig) -> Result<(), TeeError> { /* … */ }

The codec C is passed as the type parameter to all TeeParam<C> calls. For primitive types (integers, booleans) the codec is ignored — they always use the TeeParamSlot::Primitive variant. Omitting codec uses ::consortium_tee::NoCodec as the default, which causes a compile error if any serialized TeeParam types are present (since NoCodec does not implement CodecFor<T>).

Parameter type support

Rust type	TEE slot	Notes
&[u8]	MemrefInput
&mut [u8]	MemrefInout
&mut u32	ValueInout	TA reads initial, writes result back
&mut i32	ValueInout	bit-cast through u32
&mut u64	ValueInout	split across a(low)/b(high)
T: TeeParam<C>	Value/Memref	dispatched via T::into_tee_param / from
&mut T: TeeParam<C>	MemrefInout	inout codec round-trip

ctx marks the first parameter as TA context. The parameter must be a mutable reference to a named path type and is skipped when assigning TEE slots. ctx = name and ctx = 0 are accepted for compatibility and emit a deprecation warning.

Return values use the same TeeParam<C> dispatch.