RFR: 8291302: ARM32: nmethod entry barriers support

Wed Nov 30 21:03:18 UTC 2022

On Wed, 30 Nov 2022 20:26:23 GMT, Aleksei Voitylov <avoitylov at openjdk.org> wrote:

> This PR implements nmethod entry barriers for ARM32. It has already been implemented for other ports and is related with JDK-8290025 "Remove the Sweeper".

When you call the nmethod entry barrier slow path, floating point arguments are live, but can get clobbered by the C++ runtime. You need to save them. That's probably why you can't print in the slow path without crashing.

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Changes requested by eosterlund (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11442