From: Heiko Schocher <hs@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] ARM relocation, question to Heiko
Date: Mon, 04 Oct 2010 10:57:20 +0200 [thread overview]
Message-ID: <4CA996F0.3080707@denx.de> (raw)
In-Reply-To: <4CA99040.2020304@free.fr>
Hello Albert,
Albert ARIBAUD wrote:
> Le 04/10/2010 09:27, Reinhard Meyer a ?crit :
>> Dear Albert ARIBAUD,
>>>
>>> Right now I can build (not run, mind you) u-boot for edminiv2 without
>>> -fPIC/-fPIE, with -pie and a modified u-boot.lds and start.S. Almost all
>>> of the .rel.dyn fixup entries are type 23, that is, relative to the base
>>> address, which is good. However, here are about ten at the end which are
>>> type 2 -- symbol-relative -- and I am studying them in order to see if
>>> they are needed.
>>>
>>> If type 23 relocations are all that is needed, then a first ARM ELF
>>> relocation implementation should 'simply' trade GOT vs .rel.dyn
>>> relocation in start.S (I am almost there) and remove fixups in
>>> board_init_r. Start.S would apply type 23 fixups only and ignore the
>>> rest. Later on we could add a build stage to rewrite the .rel.dyn
>>> section as suggested, by filtering out non-type-23 relocs and keeping
>>> only the address part of type-23 ones, reducing the .rel.dyn table
>>> roughly by half.
>>>
>>> The good news is, I can spare a couple more hours today on this. I'll
>>> let you all know how this fares!
>>
>> Thats good news! How much did the image size increase with this table?
>
> ./MAKEALL edminiv2 results:
>
> text data bss dec hex filename
> 141376 4388 16640 162404 27a64 ./u-boot (for GOT
> reloc)
> 150160 3819 16640 170619 29a7b ./u-boot (for ELF
> reloc)
>
> u-boot.bin size in bytes:
>
> 145764 (for GOT reloc)
> 153976 (for ELF reloc)
Huh...
> The .rel.dyn table is 18472 bytes, and should eventually shrink by half,
> losing about 9 KB. That would bring the u-boot.bin size down to
> 145 KB, roughly the same size as GOT reloc -- plus we'd save a few code
... puuh ;-)
> bytes since reloc fixup functions in board_init_r would not be needed
> any more.
Sounds good. And we can easy test this, by defining CONFIG_RELOC_FIXUP_WORKS
for all arm boards ...
>> And I am willing to test your efforts on AT91 here, maybe you can send me
>> the changes to .lds and start.S beforehand so I can see what type of
>> relocation info gets produced here.
>
> I'll post an RFC patch within one or two hours.
Thanks! I am wating for it, and try your patches too.
bye,
Heiko
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
next prev parent reply other threads:[~2010-10-04 8:57 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-30 13:57 [U-Boot] ARM relocation, probably trivial mistake Reinhard Meyer
2010-09-30 14:08 ` Stefano Babic
2010-09-30 14:20 ` Reinhard Meyer
2010-09-30 15:39 ` Heiko Schocher
2010-09-30 16:06 ` Reinhard Meyer
2010-09-30 15:38 ` Heiko Schocher
2010-09-30 17:43 ` Wolfgang Denk
2010-10-01 5:25 ` Heiko Schocher
2010-10-01 5:40 ` Albert ARIBAUD
2010-10-01 5:53 ` Heiko Schocher
2010-10-01 6:39 ` Reinhard Meyer
2010-10-01 6:57 ` Heiko Schocher
2010-10-01 8:45 ` Wolfgang Denk
2010-10-01 7:01 ` Albert ARIBAUD
2010-10-01 7:42 ` [U-Boot] ARM relocation, probably trivial mistake - back to original problem Reinhard Meyer
2010-10-01 8:27 ` Heiko Schocher
2010-10-01 10:44 ` Reinhard Meyer
2010-10-01 10:55 ` Wolfgang Denk
2010-10-01 11:03 ` Reinhard Meyer
2010-10-01 11:21 ` Wolfgang Denk
2010-10-01 11:37 ` Reinhard Meyer
2010-10-01 11:59 ` Wolfgang Denk
2010-10-01 12:22 ` Reinhard Meyer
2010-10-01 12:47 ` Reinhard Meyer
2010-10-01 12:55 ` Wolfgang Denk
2010-10-01 14:55 ` Reinhard Meyer
2010-10-02 8:53 ` Heiko Schocher
2010-10-01 15:47 ` Steve Sakoman
2010-10-02 7:15 ` [U-Boot] ARM relocation, question to Heiko Reinhard Meyer
[not found] ` <4CA6E517.9040701@fr<1286167382.22760.19.camel@ptyser-laptop>
2010-10-02 7:53 ` Albert ARIBAUD
2010-10-02 8:10 ` Reinhard Meyer
2010-10-02 8:26 ` Albert ARIBAUD
2010-10-03 18:04 ` Wolfgang Denk
2010-10-02 9:08 ` Heiko Schocher
2010-10-02 9:29 ` Albert ARIBAUD
2010-10-03 18:05 ` Wolfgang Denk
2010-10-02 10:17 ` Joakim Tjernlund
2010-10-02 16:21 ` J. William Campbell
2010-10-02 18:33 ` Reinhard Meyer
2010-10-03 18:22 ` Wolfgang Denk
2010-10-02 20:39 ` Reinhard Meyer
2010-10-02 21:09 ` Albert ARIBAUD
2010-10-02 23:07 ` Graeme Russ
2010-10-03 7:10 ` Albert ARIBAUD
2010-10-03 8:44 ` Graeme Russ
2010-10-03 8:58 ` Albert ARIBAUD
2010-10-03 15:36 ` J. William Campbell
2010-10-03 16:47 ` Albert ARIBAUD
2010-10-03 17:54 ` Albert ARIBAUD
2010-10-03 18:43 ` Wolfgang Denk
2010-10-04 5:41 ` Heiko Schocher
2010-10-03 18:29 ` Wolfgang Denk
2010-10-03 19:26 ` J. William Campbell
2010-10-04 5:52 ` Heiko Schocher
2010-10-03 18:14 ` Wolfgang Denk
2010-10-03 18:54 ` J. William Campbell
2010-10-03 19:52 ` Albert ARIBAUD
2010-10-03 18:03 ` Wolfgang Denk
2010-10-03 18:34 ` Albert ARIBAUD
2010-10-03 18:45 ` Wolfgang Denk
2010-10-04 6:08 ` Heiko Schocher
2010-10-04 6:40 ` Albert ARIBAUD
2010-10-04 7:27 ` Reinhard Meyer
2010-10-04 8:28 ` Albert ARIBAUD
2010-10-04 8:57 ` Heiko Schocher [this message]
2010-10-04 9:27 ` Albert ARIBAUD
2010-10-04 10:01 ` Joakim Tjernlund
2010-10-04 9:58 ` Graeme Russ
2010-10-04 14:17 ` Albert ARIBAUD
2010-10-04 14:25 ` Rogan Dawes
2010-10-04 15:24 ` Albert ARIBAUD
2010-10-04 16:31 ` Stefan Roese
2010-10-04 21:31 ` Albert ARIBAUD
2010-10-04 7:44 ` Albert ARIBAUD
2010-10-04 4:43 ` Peter Tyser
2010-10-04 6:08 ` Wolfgang Denk
2010-10-04 7:36 ` Joakim Tjernlund
2010-10-04 8:08 ` Albert ARIBAUD
2010-10-04 8:28 ` Joakim Tjernlund
2010-10-04 8:33 ` Albert ARIBAUD
[not found] ` <OF05779DA1.EF3C4954-ONC12577B2.00307A0D-C12577B2.0030B9C0@tran <4CAA1613.80002@comcast.net>
2010-10-04 8:52 ` Joakim Tjernlund
2010-10-04 9:10 ` Albert ARIBAUD
2010-10-04 10:13 ` Wolfgang Denk
2010-10-04 15:28 ` J. William Campbell
2010-10-04 15:52 ` Albert ARIBAUD
2010-10-04 17:06 ` Wolfgang Denk
2010-10-04 17:59 ` J. William Campbell
2010-10-04 18:43 ` Joakim Tjernlund
2010-10-04 21:10 ` Wolfgang Denk
2010-10-05 7:26 ` Joakim Tjernlund
2010-10-04 17:04 ` Graeme Russ
2010-10-04 17:14 ` Wolfgang Denk
2010-10-04 8:27 ` Wolfgang Denk
2010-10-02 8:49 ` [U-Boot] ARM relocation, probably trivial mistake - back to original problem Heiko Schocher
2010-10-01 12:49 ` Wolfgang Denk
2010-10-01 14:48 ` Reinhard Meyer
2010-10-04 7:44 ` [U-Boot] AT91 clock and timer cleanups (was: ARM relocation, probably trivial mistake - back to original problem) Reinhard Meyer
2010-10-04 8:32 ` Wolfgang Denk
2010-10-04 8:42 ` [U-Boot] AT91 clock and timer cleanups Reinhard Meyer
2010-10-04 8:49 ` Wolfgang Denk
2010-10-04 8:52 ` Reinhard Meyer
2010-10-04 9:03 ` Wolfgang Denk
2010-10-04 9:12 ` Reinhard Meyer
2010-10-04 14:58 ` Reinhard Meyer
2010-10-04 17:00 ` Wolfgang Denk
2010-10-04 17:15 ` Reinhard Meyer
2010-10-04 17:32 ` Wolfgang Denk
2010-10-04 19:22 ` Reinhard Meyer
2010-10-01 8:48 ` [U-Boot] ARM relocation, probably trivial mistake - back to original problem Wolfgang Denk
2010-10-01 9:50 ` Reinhard Meyer
2010-10-01 8:03 ` [U-Boot] ARM relocation, probably trivial mistake Wolfgang Denk
2010-10-01 7:51 ` Wolfgang Denk
2010-10-01 8:28 ` Heiko Schocher
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