Integrated: 8253795: Implementation of JEP 391: macOS/AArch64 Port

[Anton Kozlov]

On Fri, 22 Jan 2021 18:49:42 GMT, Anton Kozlov <akozlov at 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)

This pull request has now been integrated.

Changeset: dbc9e4b5
Author:    Anton Kozlov <akozlov at openjdk.org>
Committer: Vladimir Kempik <vkempik at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/dbc9e4b5
Stats:     2960 lines in 75 files changed: 2851 ins; 27 del; 82 mod

8253795: Implementation of JEP 391: macOS/AArch64 Port
8253816: Support macOS W^X
8253817: Support macOS Aarch64 ABI in Interpreter
8253818: Support macOS Aarch64 ABI for compiled wrappers
8253819: Implement os/cpu for macOS/AArch64
8253839: Update tests and JDK code for macOS/Aarch64
8254941: Implement Serviceability Agent for macOS/AArch64
8255776: Change build system for macOS/AArch64
8262903: [macos_aarch64] Thread::current() called on detached thread

Co-authored-by: Vladimir Kempik <vkempik at openjdk.org>
Co-authored-by: Bernhard Urban-Forster <burban at openjdk.org>
Co-authored-by: Ludovic Henry <luhenry at openjdk.org>
Co-authored-by: Monica Beckwith <mbeckwit at openjdk.org>
Reviewed-by: erikj, ihse, prr, cjplummer, stefank, gziemski, aph, mbeckwit, luhenry

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

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