RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v5]

[Maurizio Cimadamore]

On Thu, 15 Jan 2026 23:07:47 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> I don't have the expertise to confirm the correctness of that code change. @mcimadamore, are you comfortable to  include the patch for PPC64 as described in https://github.com/openjdk/jdk/pull/28931#discussion_r2662361633?
>
> For reference: hotspot uses the platform dependent constant `CCallingConventionRequiresIntsAsLongs`  for such issues. The value is `true` on PPC64 and s390 platforms (and SPARC in earlier JDK versions).

I believe the proposed patch to be reasonable given the limitations we already covered.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2713938064