[FFmpeg-devel] arm64: Add Armv8.3-A PAC support to assembly files

[Andre Kempe]

Hi everyone,

This patch adds signing and validation of LinkRegister when storing to and
Loading from stack using Pointer Authentication Codes (PACs).

PAC support is turned on or off at compile time based on the presence of
the __ARM_FEATURE_PAC_DEFAULT feature macro. Without PAC enabled
at compile time, no additional instruction will be emitted at all.

A binary compiled with PAC support can be executed on processors
without PAC support because the instructions are defined in NOP space.

Regression tested in in a PAC-enabled environment - no issues. Could
someone please have a look and give feedback?

Thanks + Best Regards,
André

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