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Add note that inst fetches are only implicit accesses subject to VS/single-stage addr. trans. at the moment #166

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Oct 17, 2023
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Add note that inst fetches are only implicit accesses subject to VS/single-stage addr. trans. at the moment #166

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7 changes: 7 additions & 0 deletions cfi_backward.adoc
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Expand Up @@ -874,6 +874,13 @@ or `C.SSPUSH`, and the store is being made to a shadow stack page.
Shadow stack instructions cause an access-fault if the accessed page is not a
shadow stack page or if the page is in non-idempotent memory to similarly
indicate fatality.

While the specification mandates that an access-fault exception shall be
generated when either single-stage or VS-stage address translation is invoked
for an implicit access targeting a shadow stack page, it is pertinent to
highlight that, at the time of this specification's drafting, instruction
fetches are the exclusive class of implicit accesses that are subjected to
either single-stage or VS-stage address translation.
====

To support these rules, the virtual address translation process specified in
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