118 lines
5.8 KiB
HTML
118 lines
5.8 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>Input Section Basics - Untitled</title>
|
|
<meta http-equiv="Content-Type" content="text/html">
|
|
<meta name="description" content="Untitled">
|
|
<meta name="generator" content="makeinfo 4.7">
|
|
<link title="Top" rel="start" href="index.html#Top">
|
|
<link rel="up" href="Input-Section.html#Input-Section" title="Input Section">
|
|
<link rel="next" href="Input-Section-Wildcards.html#Input-Section-Wildcards" title="Input Section Wildcards">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
This file documents the GNU linker LD
|
|
(GNU Binutils)
|
|
version 2.19.
|
|
|
|
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000,
|
|
2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.1
|
|
or any later version published by the Free Software Foundation;
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
|
Back-Cover Texts. A copy of the license is included in the
|
|
section entitled ``GNU Free Documentation License''.-->
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<style type="text/css"><!--
|
|
pre.display { font-family:inherit }
|
|
pre.format { font-family:inherit }
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
|
pre.smallexample { font-size:smaller }
|
|
pre.smalllisp { font-size:smaller }
|
|
span.sc { font-variant:small-caps }
|
|
span.roman { font-family: serif; font-weight: normal; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<p>
|
|
<a name="Input-Section-Basics"></a>Next: <a rel="next" accesskey="n" href="Input-Section-Wildcards.html#Input-Section-Wildcards">Input Section Wildcards</a>,
|
|
Up: <a rel="up" accesskey="u" href="Input-Section.html#Input-Section">Input Section</a>
|
|
<hr><br>
|
|
</div>
|
|
|
|
<h5 class="subsubsection">3.6.4.1 Input Section Basics</h5>
|
|
|
|
<p><a name="index-input-section-basics-368"></a>An input section description consists of a file name optionally followed
|
|
by a list of section names in parentheses.
|
|
|
|
<p>The file name and the section name may be wildcard patterns, which we
|
|
describe further below (see <a href="Input-Section-Wildcards.html#Input-Section-Wildcards">Input Section Wildcards</a>).
|
|
|
|
<p>The most common input section description is to include all input
|
|
sections with a particular name in the output section. For example, to
|
|
include all input <span class="samp">.text</span> sections, you would write:
|
|
<pre class="smallexample"> *(.text)
|
|
</pre>
|
|
<p class="noindent">Here the <span class="samp">*</span> is a wildcard which matches any file name. To exclude a list
|
|
of files from matching the file name wildcard, EXCLUDE_FILE may be used to
|
|
match all files except the ones specified in the EXCLUDE_FILE list. For
|
|
example:
|
|
<pre class="smallexample"> *(EXCLUDE_FILE (*crtend.o *otherfile.o) .ctors)
|
|
</pre>
|
|
<p>will cause all .ctors sections from all files except <span class="file">crtend.o</span> and
|
|
<span class="file">otherfile.o</span> to be included.
|
|
|
|
<p>There are two ways to include more than one section:
|
|
<pre class="smallexample"> *(.text .rdata)
|
|
*(.text) *(.rdata)
|
|
</pre>
|
|
<p class="noindent">The difference between these is the order in which the <span class="samp">.text</span> and
|
|
<span class="samp">.rdata</span> input sections will appear in the output section. In the
|
|
first example, they will be intermingled, appearing in the same order as
|
|
they are found in the linker input. In the second example, all
|
|
<span class="samp">.text</span> input sections will appear first, followed by all
|
|
<span class="samp">.rdata</span> input sections.
|
|
|
|
<p>You can specify a file name to include sections from a particular file.
|
|
You would do this if one or more of your files contain special data that
|
|
needs to be at a particular location in memory. For example:
|
|
<pre class="smallexample"> data.o(.data)
|
|
</pre>
|
|
<p>You can also specify files within archives by writing a pattern
|
|
matching the archive, a colon, then the pattern matching the file,
|
|
with no whitespace around the colon.
|
|
|
|
<dl>
|
|
<dt><span class="samp">archive:file</span><dd>matches file within archive
|
|
<br><dt><span class="samp">archive:</span><dd>matches the whole archive
|
|
<br><dt><span class="samp">:file</span><dd>matches file but not one in an archive
|
|
</dl>
|
|
|
|
<p>Either one or both of <span class="samp">archive</span> and <span class="samp">file</span> can contain shell
|
|
wildcards. On DOS based file systems, the linker will assume that a
|
|
single letter followed by a colon is a drive specifier, so
|
|
<span class="samp">c:myfile.o</span> is a simple file specification, not <span class="samp">myfile.o</span>
|
|
within an archive called <span class="samp">c</span>. <span class="samp">archive:file</span> filespecs may
|
|
also be used within an <code>EXCLUDE_FILE</code> list, but may not appear in
|
|
other linker script contexts. For instance, you cannot extract a file
|
|
from an archive by using <span class="samp">archive:file</span> in an <code>INPUT</code>
|
|
command.
|
|
|
|
<p>If you use a file name without a list of sections, then all sections in
|
|
the input file will be included in the output section. This is not
|
|
commonly done, but it may by useful on occasion. For example:
|
|
<pre class="smallexample"> data.o
|
|
</pre>
|
|
<p>When you use a file name which is not an <span class="samp">archive:file</span> specifier
|
|
and does not contain any wild card
|
|
characters, the linker will first see if you also specified the file
|
|
name on the linker command line or in an <code>INPUT</code> command. If you
|
|
did not, the linker will attempt to open the file as an input file, as
|
|
though it appeared on the command line. Note that this differs from an
|
|
<code>INPUT</code> command, because the linker will not search for the file in
|
|
the archive search path.
|
|
|
|
</body></html>
|
|
|