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[Morello] Change the PCS to pass memory arguments through C9 instead of passing them on the stack #205

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[Morello] Change the PCS to pass memory arguments through C9 instead of passing them on the stack #205

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Commits on Jul 24, 2023

  1. [Morello] Change the PCS to pass memory arguments through C9 

    instead of passing them on the stack.

In practice for non-compartment calls the arguments are
still passed on the stack, although now there is no explicit
requirement for this.

Variadic arguments are still passed through C9 in the same
way, at the first 16-byte aligned location after the last
non-variadic argument.

This is done is such a way that reading more variadic
arguments than were passed is guaranteed to cause an
out-of-bounds fault.

Implements ARM-software#158.
    @sbaranga-arm
    sbaranga-arm committed Jul 24, 2023
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