aarch64 build does not support PAC/BTI features

[ggardet]

On aarch64/arm64, when we build with gcc13 and -mbranch-protection=standard to enable Pointer Authentication (PAC) and Branch Target Identification (BTI), the final link disable them, likely because some assembler code do not support PAC and BTI.

This is a matter to add paciasp/autiasp in start/end of functions for PAC and BTI C (or better hint #34) as landing pad on branches for BTI.

More information on :

• PAC: https://developer.arm.com/documentation/102433/0100/Return-oriented-programming
• BTI: https://developer.arm.com/documentation/102433/0100/Jump-oriented-programming