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Date: Fri, 4 Sep 2009 13:14:45 +0300
Message-ID: <cc557aab0909040314j31307c44u6af42cd1adc453a9@mail.gmail.com>
Subject: Re: [Qemu-devel] [PATCH v4 2/2] Build usermode targets as PIE
From: "Kirill A. Shutemov" <kirill@shutemov.name>
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To: Arnaud Patard <arnaud.patard@rtp-net.org>
Cc: Paolo Bonzini <bonzini@gnu.org>, Riku Voipio <riku.voipio@iki.fi>, qemu-devel@nongnu.org, Paul Brook <paul@codesourcery.com>, Juan Quintela <quintela@trasno.org>

On Fri, Sep 4, 2009 at 12:58 PM, Arnaud Patard<arnaud.patard@rtp-net.org> w=
rote:
> "Kirill A. Shutemov" <kirill@shutemov.name> writes:
>
> Hi,
>
> [...]
>
>> +cat > $TMPC <<EOF
>> +int main() {
>> + =C2=A0 =C2=A0 static __thread int i =3D 0;
>> + =C2=A0 =C2=A0 i++;
>> + =C2=A0 =C2=A0 return 0;
>> +}
>> +EOF
>> +
>> +if test "$user_pie" !=3D "no" ; then
>> + =C2=A0 =C2=A0if compile_prog "-fpie" "-pie -Wl,--fatal-warnings -Wl,--=
warn-shared-textrel"; then
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0user_pie=3D"yes"
>> + =C2=A0 =C2=A0else
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0if test "$user_pie" =3D "yes"; then
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "Toolchain has no proper=
 PIE support"
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0exit 1
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0else
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0user_pie=3D"no"
>> + =C2=A0 =C2=A0 =C2=A0 =C2=A0fi
>> + =C2=A0 =C2=A0fi
>> +fi
>
> Unfortunately, the broken mips toolchain pass this test. When you
> compile, you're getting no warning at all. Moreover, the failure is
> triggered at run-time (and this test doesn't trigger it). See
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D526961 if you want
> something which segfault with pie.
> I don't know if there are some other non-mips toolchains with broken pie
> and what's their behaviour. I hope it's crashing too...

Where can I get a mips cross-compiler with this issue to play?