RFR: 8299683: [S390X] Problems with -XX:+VerifyStack [v2]

[sid8606]

On Wed, 1 Feb 2023 16:30:58 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Setting last_Java_pc = pc() + current offset looks weird. Could it be that this breaks something which prevents the failure from happening? E.g. pointing to somewhere outside the deopt blob?
>
> I think you can't use this get_PC version for the intended purpose. It doesn't set Z_RET = start pc + offs which is what you probably wanted.

if Z_RET = start pc + offs can not be used then let me explore on how to get that offset on s390x.

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PR: https://git.openjdk.org/jdk/pull/12161