Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Rolf Eike Beer <eb@emlix.com>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-efi@vger.kernel.org,
        Linux Kernel Developers List <linux-kernel@vger.kernel.org>,
        stable@vger.kernel.org
Subject: Re: Building arm64 EFI stub with -fpie breaks build of 4.9.x (undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_')
Date:   Thu, 06 Jun 2019 09:50:28 +0200
Message-ID: <1993275.kHlTELq40E@devpool35>
Organization: emlix GmbH
In-Reply-To: <8696846.WsthzzWoxp@devpool35>
References: <779905244.a0lJJiZRjM@devpool35> <20190605162626.GA31164@kroah.com> <8696846.WsthzzWoxp@devpool35>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="nextPart1591061.3d5M5jyMvB"; micalg="pgp-sha256"; protocol="application/pgp-signature"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

--nextPart1591061.3d5M5jyMvB
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="UTF-8"

Am Donnerstag, 6. Juni 2019, 09:38:41 CEST schrieb Rolf Eike Beer:
> Greg KH wrote:
> > On Wed, Jun 05, 2019 at 05:19:40PM +0200, Rolf Eike Beer wrote:
> > > I decided to dig out a toy project which uses a DragonBoard 410c. This
> > > has
> > > been "running" with kernel 4.9, which I would keep this way for
> > > unrelated
> > > reasons. The vanilla 4.9 kernel wasn't bootable back then, but it was
> > > buildable, which was good enough.
> > >=20
> > > Upgrading the kernel to 4.9.180 caused the boot to suddenly fail:
> > >=20
> > > aarch64-unknown-linux-gnueabi-ld:
> > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o): in function
> > > `handle_kernel_image':
> > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-stub.c=
:63
> > > :
> > > undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_'
> > > aarch64-unknown-linux-gnueabi-ld:
> > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o): relocation
> > > R_AARCH64_ADR_PREL_PG_HI21 against symbol
> > > `__efistub__GLOBAL_OFFSET_TABLE_' which may bind externally can not be
> > > used when making a shared object; recompile with -fPIC
> > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-stub.c=
:63
> > > :
> > > (.init.text+0xc): dangerous relocation: unsupported relocation
> > > /tmp/e2/build/linux-4.9.139/Makefile:1001: recipe for target 'vmlinux'
> > > failed -make[1]: *** [vmlinux] Error 1
> > >=20
> > > This is caused by commit 27b5ebf61818749b3568354c64a8ec2d9cd5ecca from
> > > linux-4.9.y (which is 91ee5b21ee026c49e4e7483de69b55b8b47042be),
> > > reverting
> > > this commit fixes the build.
> > >=20
> > > This happens with vanilla binutils 2.32 and gcc 8.3.0 as well as 9.1.=
0.
> > > See
> > > the attached .config for reference.
> > >=20
> > > If you have questions or patches just ping me.
> >=20
> > Does Linus's latest tree also fail for you (or 5.1)?
>=20
> 5.1.7 with the same config as before and "make olddefconfig" builds for m=
e.

Just for the fun of it: both 4.19 and 4.19.48 also work.

Eike
=2D-=20
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
=46on +49 551 30664-0, Fax +49 551 30664-11
Gothaer Platz 3, 37083 G=C3=B6ttingen, Germany
Sitz der Gesellschaft: G=C3=B6ttingen, Amtsgericht G=C3=B6ttingen HR B 3160
Gesch=C3=A4ftsf=C3=BChrung: Heike Jordan, Dr. Uwe Kracke =E2=80=93 Ust-IdNr=
=2E: DE 205 198 055

emlix - smart embedded open source
--nextPart1591061.3d5M5jyMvB
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: This is a digitally signed message part.
Content-Transfer-Encoding: 7Bit

-----BEGIN PGP SIGNATURE-----

iLMEAAEIAB0WIQQ/Uctzh31xzAxFCLur5FH7Xu2t/AUCXPjFxAAKCRCr5FH7Xu2t
/OBSA/47p/vGbW1UKIGGe/7d+N1E9CRBcLYFYWf5EEgUsLww0G/yCYKscdy6m8g2
5lyCJtCwrJn7+1nMnTIcmu8oZh5vWR9TsOpXoH2QsRHgcAsp+xFiLvJgemMYysk8
rZEwzXGe9u5vVieSC2t7bythhrVsHjqOdUJqm+7Lw84dAAbJCw==
=ZwaA
-----END PGP SIGNATURE-----

--nextPart1591061.3d5M5jyMvB--