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

[David Holmes]

On Wed, 7 Jan 2026 20:28:14 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

> The goal of this PR is to add support for printing the values of APX extended general-purpose registers (EGPRs, R16-R31) in hs_err_pid* crash logs on x86 platforms with APX support. The implementation detects APX support at runtime and attempts to dump the additional registers when available, improving post-mortem debugging capabilities.

Why is this only implemented for Linux?

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PR Comment: https://git.openjdk.org/jdk/pull/29098#issuecomment-3766105969