Special MIPS relocation - How to?

[Alan Modra]

On Wed, Jul 03, 2002 at 09:20:21PM +0200, Francisco Rodriguez wrote:
> My problem now is, that these relocs should be resolved at link time,
> but only when all other relocs have been processed. This is because
> these relocs are based on the final ".text" section contents, not on
> symbol addresses.
> 
> And I simply don't know how to do it.
> I've only reached to tweak the bfd library so ld silently ignore my relocs
> (in bfd_mips_elf_relocate_section).
> 
> Could anyone offer a hint about how to do it?

A general solution might be:

 o  Create a fake input bfd.  (Example of fake input bfds can be found
    in ppc64elf.em and hppaelf.em.)  Further, give the fake bfd an
    input section (zero size ok) with a reloc.

 o  In ldemul_after_open, reorder the input bfd list so that the fake
    is last.

 o  In bfd_mips_elf_relocate_section, when processing normal input
    bfds, save information about your new relocs somewhere.  When
    processing the fake bfd, read the output .text section back from
    disk, and use it and the saved info to produce whatever you
    desire. 

This will be quite a lot of work.

You might be able to do something simpler, but you haven't told us
much about your new relocs.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre