[8u] RFR 8266749: AArch64: Backtracing broken on PAC enabled systems

[Hohensee, Paul]

Lgtm.

Thanks,
Paul

-----Original Message-----
From: jdk8u-dev <jdk8u-dev-retn at openjdk.java.net> on behalf of Alan Hayward <Alan.Hayward at arm.com>
Date: Tuesday, June 29, 2021 at 2:34 AM
To: "jdk8u-dev at openjdk.java.net" <jdk8u-dev at openjdk.java.net>
Subject: [8u] RFR 8266749: AArch64: Backtracing broken on PAC enabled systems

Hi,
I’d like to backport this fix.

Webrev: http://cr.openjdk.java.net/~ahayward/8266749/webrev/

On fedora 33 (and onwards), openJDK is build with PAC enabled on Aarch64.
This patch is required to make the backtracking work.

Tested manually on Fedora 33 on a PAC system (VM on M1 Mac)

Applied cleanly from TIP version, except for
* Files moved into VM directories
* New Windows and Mac files removed from patch.

I also have an 11u version awaiting review here: https://github.com/openjdk/jdk11u-dev/pull/39


(First time using webrev and back porting, so apologies if I’ve missed something)


Thanks,
Alan.
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