From: Albert ARIBAUD <albert.aribaud@free.fr>
To: u-boot@lists.denx.de
Subject: [U-Boot] ARM relocation, question to Heiko
Date: Mon, 04 Oct 2010 08:40:06 +0200 [thread overview]
Message-ID: <4CA976C6.9000009@free.fr> (raw)
In-Reply-To: <4CA96F60.50900@denx.de>
Le 04/10/2010 08:08, Heiko Schocher a ?crit :
> Hello Albert,
>
> Albert ARIBAUD wrote:
>> Le 03/10/2010 20:03, Wolfgang Denk a ?crit :
>>
>>> Dear Reinhard Meyer,
>>>
>>> In message<4CA6E8E5.2090605@emk-elektronik.de> you wrote:
>>>>> And yes, this means the content arrays of pointers such as init_sequence
>>>>> is not relocated. Been there, done that, can give you one of the
>>>>> tee-shirts I got :)
>>> It should work.
>>>
>>> Eventually we need to find out which sort of tweaking of compiler
>>> and/or linker options is needed on ARM.
>>
>> While looking for enhancements to Heiko's arm relocation patches, I have
>> gone through all relocation related compiler and linker options, and
>> then some. -fPIC / -fPIE will not generate GOT fixups for data
>> containing pointers, and I have found no additional option that will.
>
> Yep, that was also my problem ...
>
>> OTOH, -pie will generate this kind of fixup (and all others needed) in
>> the form of .rel.dyn relocations, as Bill describes.
>
> Ah! Have to look in this, maybe thats the way we have to go ...
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!
> bye,
> Heiko
Amicalement,
--
Albert.
next prev parent reply other threads:[~2010-10-04 6:40 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 [this message]
2010-10-04 7:27 ` Reinhard Meyer
2010-10-04 8:28 ` Albert ARIBAUD
2010-10-04 8:57 ` Heiko Schocher
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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