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arm64: Use the pointer auth register defines

Description

arm64: Use the pointer auth register defines

When building with gcc it complains the pointer authentication
registers aren't valid with the architecture level we are targeting.
Fix this by using the alternative spelling of these registers accesses
through MRS_REG_ALT_NAME.

Reviewed by: jhb
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D45263

Details

Provenance
andrewAuthored on Wed, May 22, 8:19 AM
Reviewer
jhb
Differential Revision
D45263: arm64: Use the pointer auth register defines
Parents
rG57d714a23f5c: arm64: Add the pointer auth registers to armreg.h
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