On Mon, 22 Mar 2021 12:50:14 GMT, Anton Kozlov <akoz...@openjdk.org> wrote:

>> Please review the implementation of JEP 391: macOS/AArch64 Port.
>> 
>> It's heavily based on existing ports to linux/aarch64, macos/x86_64, and 
>> windows/aarch64. 
>> 
>> Major changes are in:
>> * src/hotspot/cpu/aarch64: support of the new calling convention (subtasks 
>> JDK-8253817, JDK-8253818)
>> * src/hotspot/os_cpu/bsd_aarch64: copy of os_cpu/linux_aarch64 with 
>> necessary adjustments (JDK-8253819)
>> * src/hotspot/share, test/hotspot/gtest: support of write-xor-execute (W^X), 
>> required on macOS/AArch64 platform. It's implemented with 
>> pthread_jit_write_protect_np provided by Apple. The W^X mode is local to a 
>> thread, so W^X mode change relates to the java thread state change (for java 
>> threads). In most cases, JVM executes in write-only mode, except when 
>> calling a generated stub like SafeFetch, which requires a temporary switch 
>> to execute-only mode. The same execute-only mode is enabled when a java 
>> thread executes in java or native states. This approach of managing W^X mode 
>> turned out to be simple and efficient enough.
>> * src/jdk.hotspot.agent: serviceability agent implementation (JDK-8254941)
>
> Anton Kozlov has updated the pull request with a new target base due to a 
> merge or a rebase. The pull request now contains 115 commits:
> 
>  - Merge branch 'master' into jdk-macos
>  - JDK-8262491: bsd_aarch64 part
>  - JDK-8263002: bsd_aarch64 part
>  - Merge remote-tracking branch 'upstream/jdk/master' into jdk-macos
>  - Wider #ifdef block
>  - Fix most of issues in java/foreign/ tests
>    
>    Failures related to va_args are tracked in JDK-8263512.
>  - Add Azul copyright
>  - Update Oracle copyright years
>  - Use Thread::current_or_null_safe in SafeFetch
>  - 8262903: [macos_aarch64] Thread::current() called on detached thread
>  - ... and 105 more: 
> https://git.openjdk.java.net/jdk/compare/a9d2267f...5add9269

Marked as reviewed by aph (Reviewer).

-------------

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

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