tree 8cb108f73c0864e365af77051b0a36bdbe7d4ed3
parent 1dfd7b85de70c8fa8c26316b2b67a6d6b3f638fd
author Branislav Rankov <branislav.rankov@arm.com> 1581014041 +0000
committer Szabolcs Nagy <szabolcs.nagy@arm.com> 1582044419 +0000

ARMv8.5 MTE: Add MTE compatible version of strlen.

Reading outside the range of the string is only allowed within 16 byte
aligned granules when MTE is enabled.

This implementation is based on string/aarch64/strlen.S

Merged the page cross code into the main path and optimized it.
Modified the zeroones mask to ignore the bytes that are loaded but are
not part of the string. Made a special case for when there is 8 bytes
or less to check before the alignment boundary.