Commits on Mar 20, 2024

1. c18n: Save caller's stack pointer in trusted frame …

   Previously, the caller's stack pointer is only saved at the bottom of
   the caller's stack during domain transition. This means that the act of
   unwinding a trusted frame relies on external state, namely the value at
   the bottom of the caller's stack.
   
   We now also save the caller's stack pointer in the trusted frame so that
   unwinding can be stateless, i.e., inspecting the content of the trusted
   frame alone is sufficient for restoring the stack pointer of the caller.

   

   dpgao committed Mar 20, 2024
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