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118 lines
5.6 KiB
HTML
118 lines
5.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 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 1.3 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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Relocating the section contents (Untitled Document)</title>
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<meta name="description" content="Relocating the section contents (Untitled Document)">
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<meta name="keywords" content="Relocating the section contents (Untitled Document)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Performing-the-Final-Link.html#Performing-the-Final-Link" rel="up" title="Performing the Final Link">
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<link href="Writing-the-symbol-table.html#Writing-the-symbol-table" rel="next" title="Writing the symbol table">
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<link href="Information-provided-by-the-linker.html#Information-provided-by-the-linker" rel="prev" title="Information provided by the linker">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Relocating-the-section-contents"></a>
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<div class="header">
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<p>
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Next: <a href="Writing-the-symbol-table.html#Writing-the-symbol-table" accesskey="n" rel="next">Writing the symbol table</a>, Previous: <a href="Information-provided-by-the-linker.html#Information-provided-by-the-linker" accesskey="p" rel="prev">Information provided by the linker</a>, Up: <a href="Performing-the-Final-Link.html#Performing-the-Final-Link" accesskey="u" rel="up">Performing the Final Link</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Relocating-the-section-contents-1"></a>
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<h4 class="subsubsection">2.17.3.2 Relocating the section contents</h4>
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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>
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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>
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<a name="index-_005fbfd_005frelocate_005fcontents"></a>
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<a name="index-_005fbfd_005ffinal_005flink_005frelocate"></a>
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<p>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>
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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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</p>
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</body>
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</html>
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