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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 09:38:41 +0200
Message-ID: <8696846.WsthzzWoxp@devpool35>
Organization: emlix GmbH
In-Reply-To: <20190605162626.GA31164@kroah.com>
References: <779905244.a0lJJiZRjM@devpool35> <20190605162626.GA31164@kroah.com>
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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 unrelat=
ed
> > 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:6=
3:
> > 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:6=
3:
> > (.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), revert=
ing
> > 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)?

5.1.7 with the same config as before and "make olddefconfig" builds for me.

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
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