Re: access to hppa machine to work on Bug#558980
> On Mon, Dec 14, 2009 at 07:46:52AM -0500, Stephen Leake wrote:
> ...
> > Ludovic also suggested removing '-fstack-check' from the list of
> > compiler options. I did that, rebuilt the static and dynamic
> > libraries, and the bug went away; the test code works with both static
> > and dynamic libraries.
>
> Dave, Carlos,
> Would this imply something might be broken in the stack unwinding?
Possibly. An off by one error was recently fixed on GCC head.
This affects Ada but not Java. Java had code to adjust the program
counter by one instruction when catching signals. The change could
be backported to 4.4, but I don't intend to do it because the behavior
isn't a regression and it changes the behavior of libgcc_s.so. We
need a version bump for libgcc_s.so in 4.5.
We don't have any backend support for '-fstack-check'. Eric
Botcazou has recently done some updates which I think fix some issues
with generic stack checking. See for example,
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20548
So, it might help to try a recent 4.5.0 snapshot.
The fact that the stack grows upwards on hppa is a bit unusual and
might be a source of problems. It is possible that we could add backend
support for stack checking using the probe instruction, etc, but I don't
have time to look into it until we finish moving. There's still a few
remaining issues for 4.5.0 to be addressed.
> Or is this more likely to be something specific to Gnu ADA?
Dave
--
J. David Anglin dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
Reply to: