RFR: 8328306: AArch64: MacOS lazy JIT "write xor execute" switching [v2]

[Andrew Haley]

On Wed, 13 Aug 2025 22:17:48 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update src/hotspot/os_cpu/bsd_aarch64/os_bsd_aarch64.cpp
>>   
>>   Co-authored-by: Bernhard Urban-Forster <lewurm at gmail.com>
>
> src/hotspot/os_cpu/bsd_aarch64/os_bsd_aarch64.cpp line 249:
> 
>> 247:     // If we got a SIGBUS because we tried to write into the code
>> 248:     // cache, try enabling WXWrite mode.
>> 249:     if (sig == SIGBUS && pc != info->si_addr && CodeCache::contains(info->si_addr)) {
> 
> Suggestion:
> 
>     if (sig == SIGBUS && pc != info->si_addr && CodeCache::contains(info->si_addr) && !CodeCache::contains(pc)) {
> 
> I think we want to make sure the code doing the write is outside the codecache.

Ah yes, good point.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26562#discussion_r2275848624