RFR: 8287325: AArch64: fix virtual threads with -XX:UseBranchProtection=pac-ret [v2]

[Dean Long]

On Mon, 5 Jun 2023 01:15:40 GMT, Hao Sun <haosun at openjdk.org> wrote:

> > What I thinking was to use the absolute SP during call/return, but "relativize" it on continuation freeze and then rewrite to the new absolute address on thaw.
> 
> Thanks for your review. But the exception is that the **fast path** in stack copying doesn't walk the frames. In this case, I'm afraid we have no chance to "relativize" the SP.

OK, that makes sense.

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PR Comment: https://git.openjdk.org/jdk/pull/13322#issuecomment-1577239174