RFR: 8277204: Implement PAC-RET branch protection on Linux/AArch64 [v18]

[Andrew Haley]

On Tue, 8 Feb 2022 09:40:49 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Doing this caused 7 failures across a full jtreg run, namely:
>> 
>> serviceability/sa/ClhsdbFindPC.java#xcomp-core
>> vmTestbase/jit/misctests/fpustack/GraphApplet.java
>> vmTestbase/nsk/jdi/MonitorWaitRequest/MonitorWaitRequest001/TestDescription.java
>> vmTestbase/nsk/jdi/MonitorWaitedRequest/MonitorWaitedRequest001/TestDescription.java
>> vmTestbase/nsk/jdwp/ThreadReference/ForceEarlyReturn/forceEarlyReturn002/forceEarlyReturn002.java
>> vmTestbase/nsk/jdwp/ThreadReference/OwnedMonitorsStackDepthInfo/ownedMonitorsStackDepthInfo002/ownedMonitorsStackDepthInfo002.java
>> vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine/TestDescription.java
>> 
>> ....I'll investigate.
>
>> Doing this caused 7 failures across a full jtreg run, namely:
> 
> I'm glad we caught that.

Status? Is branch protection really incompatible with PreserveFramePointer?

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PR: https://git.openjdk.java.net/jdk/pull/6334