[OpenJDK 2D-Dev] RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v21]
aph at openjdk.java.net
Mon Mar 1 10:33:59 UTC 2021
On Fri, 26 Feb 2021 19:17:12 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)
> Anton Kozlov has updated the pull request incrementally with two additional commits since the last revision:
> - Merge remote-tracking branch 'origin/jdk/jdk-macos' into jdk-macos
> - Minor fixes
src/hotspot/cpu/aarch64/globalDefinitions_aarch64.hpp line 62:
> 61: #if defined(__APPLE__) || defined(_WIN64)
> 62: #define R18_RESERVED
#define R18_RESERVED true```
More information about the 2d-dev