From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-mips@vger.kernel.org, clang-built-linux@googlegroups.com,
Fangrui Song <maskray@google.com>,
Nathan Chancellor <natechancellor@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Borislav Petkov <bp@suse.de>, Kees Cook <keescook@chromium.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] MIPS: Truncate link address into 32bit for 32bit kernel
Date: Mon, 13 Apr 2020 07:59:29 +0100 (BST) [thread overview]
Message-ID: <alpine.LFD.2.21.2004130736410.851719@eddie.linux-mips.org> (raw)
In-Reply-To: <20200413062651.3992652-1-jiaxun.yang@flygoat.com>
On Mon, 13 Apr 2020, Jiaxun Yang wrote:
> LLD failed to link vmlinux with 64bit load address for 32bit ELF
> while bfd will strip 64bit address into 32bit silently.
> To fix LLD build, we should truncate load address provided by platform
> into 32bit for 32bit kernel.
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
> diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
> index a5f00ec73ea6..5226cd8e4bee 100644
> --- a/arch/mips/kernel/vmlinux.lds.S
> +++ b/arch/mips/kernel/vmlinux.lds.S
> @@ -55,7 +55,7 @@ SECTIONS
> /* . = 0xa800000000300000; */
> . = 0xffffffff80300000;
> #endif
> - . = VMLINUX_LOAD_ADDRESS;
> + . = VMLINUX_LINK_ADDRESS;
The CONFIG_BOOT_ELF64 cruft right above it looks interesting to me, never
have ever been used. We have had the current arrangement since:
commit 923ec3d20eef9e36456868b590873ce39f17fe71
Author: Ralf Baechle <ralf@linux-mips.org>
Date: Wed Nov 6 22:16:38 2002 +0000
Define load address in linker script instead of relying on the
deprecated and notoriously unreliable option -Ttext.
and previously `-Ttext' was used with this script anyway, though not very
long, as the script was entirely ignored until:
commit 7a782968041ffc4c2d89816238e2f8ea5cceddba
Author: Ralf Baechle <ralf@linux-mips.org>
Date: Thu Oct 31 23:54:21 2002 +0000
Merge with Linux 2.5.36.
Maciej
next prev parent reply other threads:[~2020-04-13 6:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-13 6:26 [PATCH v4] MIPS: Truncate link address into 32bit for 32bit kernel Jiaxun Yang
2020-04-13 6:59 ` Maciej W. Rozycki [this message]
2020-04-13 7:32 ` Jiaxun Yang
2020-04-13 15:34 ` Fangrui Song
2020-04-13 20:08 ` Maciej W. Rozycki
2020-04-13 20:06 ` Maciej W. Rozycki
2020-04-13 16:25 ` Kees Cook
2020-04-13 18:52 ` Nathan Chancellor
2020-04-22 14:32 ` [PATCH v5] " Jiaxun Yang
2020-04-22 22:16 ` Nathan Chancellor
2020-04-23 0:10 ` Maciej W. Rozycki
2020-04-23 5:42 ` Jiaxun Yang
2020-04-24 12:22 ` Maciej W. Rozycki
2020-05-04 15:46 ` Thomas Bogendoerfer
2020-05-04 16:09 ` Jiaxun Yang
2020-05-04 16:56 ` Thomas Bogendoerfer
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