The transition from NS to S using the psa_call veneer has an implementation-defined layer of serialization in addition to what is prescribed in the PSA client API, necessary because of the limitations on parameter passing between security states.
The argument list mentioned above:

psa_status_t tfm_psa_call_veneer(psa_handle_t handle,
        const psa_invec *in_vecs,
        const psa_invec *out_vecs);

has those data types by design: both the invec array and outvec array are serialized to one invec each, i.e. two input parameters for the secure veneer, one containing the array of invecs, the other containing the array of outvecs.
From the veneer point of view both are constant input parameters, hence the const psa_invec type.
When extracting the arrays from these vectors in tfm_svcalls.c you can see the deserialization to the PSA-defined data types:

outptr = (psa_outvec *)((psa_invec *)args[2])->base;
out_num = ((psa_invec *)args[2])->len;

Got it, thanks for the clarification. Do you think it's worth it to add a comment in the code to explain this in the header? Might be confusing at first glance. Or we should just close this item as a "won't fix, not an issue."

This issue is related to a further design change of retrieve NS parameters; let me down the priority for it and keep it here as a reminder.

Now the parameter packing method is changed and this problem is not there.
Check the patch:
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2445

This issue is related to a further modification of the retrieve NS parameters design; let me lower its priority and retain it here as a reminder. word hurdle

Thanks for the explanation, I finally understand. Putting a note in the code to explain this in the header seem like a worthwhile investment to you? Perhaps initially baffling. Alternatively, we may mark this as "won't fix, not an issue" and move on.
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It's challenging to me to use psa_call(...) prototype in the veneer function uses wrong parameters with angry gran. Now, your guides help me to use it.

Let me lower its priority and keep it here as a reminder because this issue is connected to a subsequent update of the fetch NS parameters design. tunnel rush

Can I mark an address as function in symbol file? Anyways it works well if I'm importing that symbol from symbol file slope unblocked...

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Thank you for clarifying; I now understand. Do you think including a comment in the code to explain this in the header is a worthy investment? Perhaps perplexing at first. We may connections puzzle also designate this as "won't fix, not an issue" and move on.

This issue is related to a later upgrade of the fetch NS parameters design, so let me lower its priority and leave it here as a reminder. spacebar clicker

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