RFR: 8374744: Enable dumping of APX EGPRs (R16–R31) in JVM fatal error logs

[David Holmes]

On Thu, 29 Jan 2026 21:47:27 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

> > Why is this only implemented for Linux?
> 
> Hello David (@dholmes-ora), this change is only implemented for Linux as APX support is available from kernel >= 6.16. For Windows, the status of APX support is not known.
> 
> Thanks, Vamsi

None of the code predicated on `UseAPX` is Linux-only but is all OS-agnostic as far as I can see. These changes seem applicable to all x86 platforms: Linux, Windows, macOS. Unfortunately `os::print_register_info` is duplicated across all three OS (with one key difference for each OS - how to read a register from the context).

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

PR Comment: https://git.openjdk.org/jdk/pull/29098#issuecomment-3821170840