On Sat, May 25, 2013 at 5:39 AM, Clemens Kolbitsch <kolbit...@lastline.com> wrote: > Hi guys, > > we recently had an issue with running a program using FPU instructions > to obtain the current EIP (basically a weird way of "call 0; pop eax") > that was not working on QEMU (with TCG). > > Looking at the problem, we found this patch to be useful/fixing the issue: > > https://launchpadlibrarian.net/140457932/patch-qemu-1.5.0-fpip.diff This patch is not working fully because the floating-point control instructions do not change fpip.
> > Looking through the DEVEL archives, I found this patch > > http://lists.nongnu.org/archive/html/qemu-devel/2011-06/msg01206.html > > that adds the FPU flags to the environment, but is only using them for KVM. > > I was wondering - since the above patch is rather old, you have > probably come across it before - if there was a reason for not > including it in QEMU (I checked in git:master and it's not applied). > If there isn't, maybe it'd be worth re-considering :) > > thanks! > -Clemens > > > -- > Clemens Kolbitsch > Security Researcher > kolbit...@lastline.com > > Lastline, Inc. > 6950 Hollister Avenue, Suite 101 > Goleta, CA 93117 > > www.lastline.com >
