[aarch64-port-dev ] [Roland Westrelin] Re: Aarch64 port for ZGC, so far

Stuart Monteith stuart.monteith at linaro.org
Mon Apr 15 14:59:53 UTC 2019

Furthermore, if the top 8-bits of GPRs were being wiped on SIGSEGV,
and not restored on return, then we'd already be experiencing that
problem. ZGC simply makes use of an existing feature - I've not turned
it on. It just so happens that for GPRs with the pointers, the top 8
bits is now significant.

On Mon, 15 Apr 2019 at 15:56, Andrew Haley <aph at redhat.com> wrote:
> On 4/15/19 3:00 PM, Andrew Dinn wrote:
> > Yikes! Does that not imply that when we return from a SIGSEGV into a
> > handler that an oop held in a register may have its tags wiped?
> We'll have to try it.
> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671

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