bfd.info: Relocating the section contents

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Relocating the section contents

   The `_bfd_final_link' function should look through the `link_order'
structures attached to each section of the output file.  Each
`link_order' structure should either be handled specially, or it should
be passed to the function `_bfd_default_link_order' which will do the
right thing (`_bfd_default_link_order' is defined in `linker.c').
   For efficiency, a `link_order' of type `bfd_indirect_link_order'
whose associated section belongs to a BFD of the same format as the
output BFD must be handled specially.  This type of `link_order'
describes part of an output section in terms of a section belonging to
one of the input files.  The `_bfd_final_link' function should read the
contents of the section and any associated relocs, apply the relocs to
the section contents, and write out the modified section contents.  If
performing a relocateable link, the relocs themselves must also be
modified and written out.
   The functions `_bfd_relocate_contents' and
`_bfd_final_link_relocate' provide some general support for performing
the actual relocations, notably overflow checking.  Their arguments
include information about the symbol the relocation is against and a
`reloc_howto_type' argument which describes the relocation to perform.
These functions are defined in `reloc.c'.
   The a.out function which handles reading, relocating, and writing
section contents is `aout_link_input_section'.  The actual relocation
is done in `aout_link_input_section_std' and
`aout_link_input_section_ext'.