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90 lines
4.4 KiB
HTML
90 lines
4.4 KiB
HTML
15 years ago
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<title>Relocating the section contents - Untitled</title>
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Performing-the-Final-Link.html#Performing-the-Final-Link" title="Performing the Final Link">
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<link rel="prev" href="Information-provided-by-the-linker.html#Information-provided-by-the-linker" title="Information provided by the linker">
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<link rel="next" href="Writing-the-symbol-table.html#Writing-the-symbol-table" title="Writing the symbol table">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the BFD library.
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Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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Free Software'', the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled ``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.-->
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</head>
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<body>
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<div class="node">
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<p>
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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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<hr><br>
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</div>
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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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