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clarify element zero exceptions for FoF loads #487

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Dec 18, 2024
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clarify element zero exceptions for FoF loads #487

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6 changes: 1 addition & 5 deletions src/vector-integration.adoc
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Expand Up @@ -26,11 +26,7 @@ _no_ CHERI fault will be taken.
This is consistent with other exceptions such as page faults which are only taken
on _active_ elements.

In the case of fault-only-first loads, only the first element will cause a CHERI
length violation. If a later element causes a length violation, then it will be
treated the same way as a page fault and vl will be reduced.
All other CHERI exceptions, such as tag and permission violations are checked on
the first element, and so will be taken as expected.
In the case of fault-only-first loads, a trap caused by a CHERI exception will only be taken if it caused by element 0 (and then only if element 0 is active). If another active element causes a CHERI exception then it is treated the same way as other exceptions, the trap is not taken and instead vl is reduced.

NOTE: Indexed loads in {cheri_cap_mode_name} check the bounds of every access against
the authority capability in `cs1`. Therefore the approach of having a zero base
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