From: Sam Ravnborg <sam@ravnborg.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: fastboot@osdl.org, linux-kernel@vger.kernel.org,
Horms <horms@verge.net.au>,
Jan Kratochvil <lace@jankratochvil.net>,
"H. Peter Anvin" <hpa@zytor.com>,
Magnus Damm <magnus.damm@gmail.com>,
Vivek Goyal <vgoyal@in.ibm.com>, Linda Wang <lwang@redhat.com>
Subject: Re: [PATCH 1/33] i386: vmlinux.lds.S Distinguish absolute symbols
Date: Tue, 1 Aug 2006 21:06:57 +0200 [thread overview]
Message-ID: <20060801190657.GA12573@mars.ravnborg.org> (raw)
In-Reply-To: <11544302283864-git-send-email-ebiederm@xmission.com>
On Tue, Aug 01, 2006 at 05:03:16AM -0600, Eric W. Biederman wrote:
> Ld knows about 2 kinds of symbols, absolute and section
> relative. Section relative symbols symbols change value
> when a section is moved and absolute symbols do not.
>
> Currently in the linker script we have several labels
> marking the beginning and ending of sections that
> are outside of sections, making them absolute symbols.
> Having a mixture of absolute and section relative
> symbols refereing to the same data is currently harmless
> but it is confusing.
In the past we have seen problems when there was some padding between
the global symbol and the actual section start. The reason for the
padding was the alignment of the section which is aligned accordign to
the longest of the contained symbols. So no matter the
relocatable kernel this is an improvement.
Sam
next prev parent reply other threads:[~2006-08-01 19:07 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 10:58 [RFC] ELF Relocatable x86 and x86_64 bzImages Eric W. Biederman
2006-08-01 11:03 ` [PATCH 1/33] i386: vmlinux.lds.S Distinguish absolute symbols Eric W. Biederman
2006-08-01 19:06 ` Sam Ravnborg [this message]
2006-08-01 11:03 ` [PATCH 2/33] i386: define __pa_symbol Eric W. Biederman
2006-08-01 19:06 ` Andi Kleen
2006-08-02 2:19 ` Eric W. Biederman
2006-08-02 3:04 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 3/33] i386 setup.c: Reserve kernel memory starting from _text Eric W. Biederman
2006-08-01 11:03 ` [PATCH 4/33] i386: CONFIG_PHYSICAL_START cleanup Eric W. Biederman
2006-08-01 19:08 ` Sam Ravnborg
2006-08-02 2:23 ` Eric W. Biederman
2006-08-02 16:14 ` Eric W. Biederman
2006-08-03 14:05 ` Sam Ravnborg
2006-08-01 11:03 ` [PATCH 5/33] i386 Kconfig: Add a range definition to config PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 6/33] Make linux/elf.h safe to be included in assembly files Eric W. Biederman
2006-08-01 11:03 ` [PATCH 7/33] elf: Add ELFOSABI_STANDALONE to elf.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 8/33] kallsyms.c: Generate relocatable symbols Eric W. Biederman
2006-08-01 11:36 ` Paulo Marques
2006-08-01 11:52 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 9/33] i386 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 19:19 ` Andi Kleen
2006-08-02 2:30 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 4:57 ` Eric W. Biederman
2006-08-02 5:21 ` Andi Kleen
2006-08-02 6:44 ` Eric W. Biederman
2006-08-02 3:06 ` Eric W. Biederman
2006-08-02 3:10 ` Andi Kleen
2006-08-02 5:27 ` Eric W. Biederman
2006-08-02 5:44 ` Andi Kleen
2006-08-02 7:14 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 10/33] i386: Relocatable kernel support Eric W. Biederman
2006-08-01 13:34 ` Mika Penttilä
2006-08-01 18:07 ` Eric W. Biederman
2006-08-01 18:11 ` Sam Ravnborg
2006-08-01 18:16 ` Mika Penttilä
2006-08-01 11:03 ` [PATCH 11/33] i386 boot: Add an ELF header to bzImage Eric W. Biederman
2006-08-01 22:10 ` Jeremy Fitzhardinge
2006-08-02 2:38 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 12/33] x86_64: fixup indentation in e820.c Eric W. Biederman
2006-08-01 11:03 ` [PATCH 13/33] x86_64: Remove assumptions about the kernel start address from e820/bad_addr() Eric W. Biederman
2006-08-01 11:03 ` [PATCH 14/33] x86_64: Properly report in /proc/iomem the kernel address Eric W. Biederman
2006-08-01 11:03 ` [PATCH 15/33] x86_64: Fix kernel direct mapping size check Eric W. Biederman
2006-08-01 11:03 ` [PATCH 16/33] x86_64: Assembly safe page.h and pgtable.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 17/33] x86_64: Separate normal memory map initialization from the hotplug case Eric W. Biederman
2006-08-01 11:03 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds Eric W. Biederman
2006-08-01 19:02 ` Andi Kleen
2006-08-02 2:08 ` Eric W. Biederman
2006-08-01 19:04 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds II Andi Kleen
2006-08-02 2:11 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 5:35 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 19/33] x86_64: Cleanup the early boot page table Eric W. Biederman
2006-08-01 11:03 ` [PATCH 20/33] x86_64: fix early_printk to use the standard ISA mapping Eric W. Biederman
2006-08-01 11:03 ` [PATCH 21/33] x86_64: modify copy_bootdata to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 22/33] x86_64: Fix gdt table size in trampoline.S Eric W. Biederman
2006-08-01 18:59 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 23/33] x86_64: cleanup segments Eric W. Biederman
2006-08-01 11:03 ` [PATCH 24/33] x86_64: Add EFER to the set registers saved by save_processor_state Eric W. Biederman
2006-08-01 11:03 ` [PATCH 25/33] x86_64: 64bit PIC SMP trampoline Eric W. Biederman
2006-08-01 19:13 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 26/33] x86_64: 64bit PIC ACPI wakeup Eric W. Biederman
2006-08-01 19:10 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 27/33] x86_64: Modify discover_ebda to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 28/33] x86_64: Remove the identity mapping as early as possible Eric W. Biederman
2006-08-01 19:15 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 29/33] x86_64: __pa and __pa_symbol address space separation Eric W. Biederman
2006-08-01 11:03 ` [PATCH 30/33] x86_64: Remove CONFIG_PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 31/33] x86_64 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 11:03 ` [PATCH 32/33] x86_64: Relocatable kernel support Eric W. Biederman
2006-08-01 19:11 ` Andi Kleen
2006-08-02 2:25 ` Eric W. Biederman
2006-11-05 6:02 ` Yinghai Lu
2006-11-05 6:52 ` Eric W. Biederman
2006-11-05 7:15 ` Yinghai Lu
2006-08-01 11:03 ` [PATCH 33/33] x86_64: Make bzImage a valid 64bit elf executable Eric W. Biederman
2006-08-01 19:26 ` [RFC] ELF Relocatable x86 and x86_64 bzImages Vivek Goyal
2006-08-01 20:13 ` Jan Kratochvil
2006-08-01 20:25 ` H. Peter Anvin
2006-08-02 2:02 ` Eric W. Biederman
2006-08-01 20:40 ` Vivek Goyal
2006-08-02 2:40 ` Eric W. Biederman
2006-08-02 6:34 ` Magnus Damm
2006-08-02 7:09 ` Eric W. Biederman
2006-08-02 8:34 ` Magnus Damm
2006-08-02 9:59 ` Eric W. Biederman
2006-08-02 18:37 ` [Fastboot] " Don Zickus
2006-08-03 1:00 ` Eric W. Biederman
2006-08-03 4:53 ` H. Peter Anvin
2006-08-04 22:56 ` Vivek Goyal
2006-08-04 23:14 ` Eric W. Biederman
2006-08-04 23:38 ` Dave Jones
2006-08-04 23:47 ` H. Peter Anvin
2006-08-05 8:01 ` Eric W. Biederman
2006-08-08 3:34 ` Horms
2006-08-08 4:32 ` H. Peter Anvin
2006-08-08 4:57 ` Magnus Damm
2006-08-08 5:04 ` Eric W. Biederman
2006-08-08 6:09 ` Horms
2006-08-08 7:23 ` Eric W. Biederman
2006-08-08 7:58 ` Horms
2006-08-09 14:56 ` D. Hazelton
2006-08-17 18:44 ` Vivek Goyal
2006-08-11 13:11 ` [Fastboot] " Rachita Kothiyal
2006-08-11 13:36 ` Vivek Goyal
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