RFR: 8308503: AArch64: SIGILL when running with -XX:UseBranchProtection=pac-ret on hardware without PAC feature

[Andrew Haley]

On Tue, 23 May 2023 15:51:50 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Virtual threads are proposed to be a permanent feature in JDK 21 so I assume predicating this on Arguments:enable_preview check no longer make sense.

Oh, I **see**. So it really only makes sense either to make ROP protection work in vthreads, or just disable ROP protection in JDK 21.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14095#discussion_r1202642014