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