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90 lines
4.4 KiB
HTML
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<a name="Relocating-the-section-contents"></a>Next: <a rel="next" accesskey="n" href="Writing-the-symbol-table.html#Writing-the-symbol-table">Writing the symbol table</a>,
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Previous: <a rel="previous" accesskey="p" href="Information-provided-by-the-linker.html#Information-provided-by-the-linker">Information provided by the linker</a>,
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Up: <a rel="up" accesskey="u" href="Performing-the-Final-Link.html#Performing-the-Final-Link">Performing the Final Link</a>
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<h5 class="subsubsection">2.17.3.2 Relocating the section contents</h5>
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<p>The <code>_bfd_final_link</code> function should look through the
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<code>link_order</code> structures attached to each section of the
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output file. Each <code>link_order</code> structure should either be
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handled specially, or it should be passed to the function
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<code>_bfd_default_link_order</code> which will do the right thing
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(<code>_bfd_default_link_order</code> is defined in <code>linker.c</code>).
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<p>For efficiency, a <code>link_order</code> of type
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<code>bfd_indirect_link_order</code> whose associated section belongs
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to a BFD of the same format as the output BFD must be handled
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specially. This type of <code>link_order</code> describes part of an
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output section in terms of a section belonging to one of the
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input files. The <code>_bfd_final_link</code> function should read the
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contents of the section and any associated relocs, apply the
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relocs to the section contents, and write out the modified
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section contents. If performing a relocatable link, the
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relocs themselves must also be modified and written out.
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<p><a name="index-_005fbfd_005frelocate_005fcontents-1377"></a><a name="index-_005fbfd_005ffinal_005flink_005frelocate-1378"></a>The functions <code>_bfd_relocate_contents</code> and
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<code>_bfd_final_link_relocate</code> provide some general support for
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performing the actual relocations, notably overflow checking.
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Their arguments include information about the symbol the
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relocation is against and a <code>reloc_howto_type</code> argument
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which describes the relocation to perform. These functions
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are defined in <code>reloc.c</code>.
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<p>The a.out function which handles reading, relocating, and
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writing section contents is <code>aout_link_input_section</code>. The
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actual relocation is done in <code>aout_link_input_section_std</code>
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and <code>aout_link_input_section_ext</code>.
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</body></html>
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