114 lines
4.8 KiB
HTML
114 lines
4.8 KiB
HTML
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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) 1991-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Untitled Document: Section Input</title>
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<meta name="description" content="Untitled Document: Section Input">
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<meta name="keywords" content="Untitled Document: Section Input">
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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="Sections.html#Sections" rel="up" title="Sections">
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<link href="Section-Output.html#Section-Output" rel="next" title="Section Output">
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<link href="Sections.html#Sections" rel="prev" title="Sections">
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<style type="text/css">
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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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Section-Input"></a>
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<div class="header">
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<p>
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Next: <a href="Section-Output.html#Section-Output" accesskey="n" rel="next">Section Output</a>, Previous: <a href="Sections.html#Sections" accesskey="p" rel="prev">Sections</a>, Up: <a href="Sections.html#Sections" accesskey="u" rel="up">Sections</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="Section-input"></a>
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<h4 class="subsection">2.6.1 Section input</h4>
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<p>When a BFD is opened for reading, the section structures are
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created and attached to the BFD.
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</p>
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<p>Each section has a name which describes the section in the
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outside world—for example, <code>a.out</code> would contain at least
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three sections, called <code>.text</code>, <code>.data</code> and <code>.bss</code>.
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</p>
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<p>Names need not be unique; for example a COFF file may have several
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sections named <code>.data</code>.
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</p>
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<p>Sometimes a BFD will contain more than the “natural” number of
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sections. A back end may attach other sections containing
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constructor data, or an application may add a section (using
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<code>bfd_make_section</code>) to the sections attached to an already open
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BFD. For example, the linker creates an extra section
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<code>COMMON</code> for each input file’s BFD to hold information about
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common storage.
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</p>
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<p>The raw data is not necessarily read in when
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the section descriptor is created. Some targets may leave the
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data in place until a <code>bfd_get_section_contents</code> call is
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made. Other back ends may read in all the data at once. For
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example, an S-record file has to be read once to determine the
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size of the data. An IEEE-695 file doesn’t contain raw data in
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sections, but data and relocation expressions intermixed, so
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the data area has to be parsed to get out the data and
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relocations.
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</p>
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</body>
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</html>
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