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Re: [PROBLEM FOUND] qemu-arm on FC2 (was: Re: [Qemu-devel] ARM in big en

From: David Woodhouse
Subject: Re: [PROBLEM FOUND] qemu-arm on FC2 (was: Re: [Qemu-devel] ARM in big endian mode?)
Date: Fri, 06 Aug 2004 17:31:14 +0100

On Fri, 2004-08-06 at 17:59 +0200, Lennert Buytenhek wrote:
> On Fri, Aug 06, 2004 at 03:55:07PM +0100, David Woodhouse wrote:
> > > > > % ./qemu-arm ./x
> > > > > qemu: uncaught target signal 11 (Segmentation fault) - exiting
> >   <...>
> > > Just checked, and indeed, LE binaries segfault too.
> >   <...>
> > > So it looks like it (might have) worked in the past but broke somewhere
> > > between then and now.
> > 
> > Are you using a newer glibc now than the one you were using before?
> Yes.  Now I'm using Fedora Core 2, but Red Hat 9 back then, I think.

Hmm. I meant the ARM glibc, not the host. I have a vague recollection
that using an older ARM libc made it work OK. Using statically linked
ARM binaries also made it work.

> I just found some time for some more testing, and it's FC2's noexecstack
> messing up in this particular case.  If I create, using gcc 2.95.3 and
> glibc 2.1.3 vanilla, a static ARM little-endian "Hello world" binary, and
> run it with qemu-arm latest CVS, it works if I specify -Wl,-z,execstack
> when linking qemu-arm, and crashes with sig11 if I do not.

With 0.6.0 this doesn't do it for me. This is a Familiar 0.7.2 image
with glibc 2.3.2

shinybook /home/dwmw2/working/pkgs/qemu/qemu-0.6.0/arm-user $ gcc -g 
-Wl,-T,/home/dwmw2/working/pkgs/qemu/qemu-0.6.0/ppc.ld -o qemu-arm elfload.o 
main.o syscall.o mmap.o signal.o path.o osdep.o thunk.o nwfpe/softfloat.o 
nwfpe/fpa11.o nwfpe/fpa11_cpdo.o nwfpe/fpa11_cpdt.o nwfpe/fpa11_cprt.o 
nwfpe/fpopcode.o nwfpe/single_cpdo.o nwfpe/double_cpdo.o nwfpe/extended_cpdo.o 
libqemu.a  -lm -Wl,-z,execstack
shinybook /home/dwmw2/working/pkgs/qemu/qemu-0.6.0/arm-user $ ./qemu-arm 
/usr/qemu-arm/bin/echo hello
qemu: uncaught target signal 11 (Segmentation fault) - exiting 


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