RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v10]

[Anton Kozlov]

On Thu, 4 Feb 2021 22:15:47 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> Anton Kozlov has updated the pull request incrementally with six additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'origin/jdk/jdk-macos' into jdk-macos
>>  - Add comments to WX transitions
>>    
>>    + minor change of placements
>>  - Use macro conditionals instead of empty functions
>>  - Add W^X to tests
>>  - Do not require known W^X state
>>  - Revert w^x in gtests
>
> src/hotspot/os_cpu/bsd_aarch64/os_bsd_aarch64.cpp line 322:
> 
>> 320: #ifdef __APPLE__
>> 321:       } else if (sig == SIGFPE && info->si_code == FPE_NOOP) {
>> 322:         Unimplemented();
> 
> Is there a follow up issue for this?

Thanks, this is a leftover from the development phase, it will be removed. In macos/x86, this looks like a workaround. We've never met with this condition and it looks recent darwin kernel should correctly report the cause in si_code: https://github.com/apple/darwin-xnu/blob/33eb9835cd948dbbcdd8741aa52457cbe507c765/bsd/dev/arm/unix_signal.c#L436.

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PR: https://git.openjdk.java.net/jdk/pull/2200