> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Haavard Skinnemoen > Sent: den 25 juli 2008 14:19 > To: kenneth johansson > Cc: vb; u-boot-users@lists.sourceforge.net; Wolfgang Denk > Subject: Re: [U-Boot-Users] Changing u-boot relocation scheme > > On Fri, 25 Jul 2008 13:55:58 +0200 > kenneth johansson <[EMAIL PROTECTED]> wrote: > > > > An ELF shared library has the dynamic relocations we need. So if we > > > build u-boot as an .so file, it should work in theory on most > > > architectures. > > > > well the elf binary of u-boot obviously has everything we need > > regardless of what options it was compiled with. If we had a full linker > > at runtime we could just do a relink to whatever address we wanted. > > No we couldn't if we don't have any relocation information. Just as you > can't relink just any ELF binary to run at a different location after > it's been through a final link, no matter how "full" the linker is. > > And if the ELF file wasn't compiled as position-independent code to > begin with, there's just no way it will ever work if it's loaded at a > different address than it was linked at. You can't go through and fix > up all the compiler-generated address calculations when you don't even > have a clue where they are! > > So whether or not the u-boot ELF file has everything we need depends a > _lot_ on what options were used when building it.
Exactly. > > > It sounds a bit easier to just loop over a list of pointers and change > > the values than to implement a complete linker but maybe that is just > > me. > > The question remains how should that list of pointers be generated? One > possible answer is to let the linker do it (as dynamic relocations). I think the best bet is to make -mrelocatable work for PPC. Question is how does the other arches do it? Do they include fixup ptrs by default or do they lack this functionality? Jocke > > Haavard ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
