103 lines
4.5 KiB
HTML
103 lines
4.5 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This file documents the GNU linker LD
|
|
(Linaro_Binutils-2017.02)
|
|
version 2.27.0.
|
|
|
|
Copyright (C) 1991-2016 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 1.3
|
|
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". -->
|
|
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>LD: Orphan Sections</title>
|
|
|
|
<meta name="description" content="LD: Orphan Sections">
|
|
<meta name="keywords" content="LD: Orphan Sections">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Expressions.html#Expressions" rel="up" title="Expressions">
|
|
<link href="Location-Counter.html#Location-Counter" rel="next" title="Location Counter">
|
|
<link href="Symbols.html#Symbols" rel="prev" title="Symbols">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.indentedblock {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style:oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nocodebreak {white-space:nowrap}
|
|
span.nolinebreak {white-space:nowrap}
|
|
span.roman {font-family:serif; font-weight:normal}
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
|
<a name="Orphan-Sections"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Location-Counter.html#Location-Counter" accesskey="n" rel="next">Location Counter</a>, Previous: <a href="Symbols.html#Symbols" accesskey="p" rel="prev">Symbols</a>, Up: <a href="Expressions.html#Expressions" accesskey="u" rel="up">Expressions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="Orphan-Sections-1"></a>
|
|
<h4 class="subsection">3.10.4 Orphan Sections</h4>
|
|
<a name="index-orphan"></a>
|
|
<p>Orphan sections are sections present in the input files which
|
|
are not explicitly placed into the output file by the linker
|
|
script. The linker will still copy these sections into the
|
|
output file, but it has to guess as to where they should be
|
|
placed. The linker uses a simple heuristic to do this. It
|
|
attempts to place orphan sections after non-orphan sections of the
|
|
same attribute, such as code vs data, loadable vs non-loadable, etc.
|
|
If there is not enough room to do this then it places
|
|
at the end of the file.
|
|
</p>
|
|
<p>For ELF targets, the attribute of the section includes section type as
|
|
well as section flag.
|
|
</p>
|
|
<p>The command line options ‘<samp>--orphan-handling</samp>’ and ‘<samp>--unique</samp>’
|
|
(see <a href="Options.html#Options">Command Line Options</a>) can be used to control which
|
|
output sections an orphan is placed in.
|
|
</p>
|
|
<p>If an orphaned section’s name is representable as a C identifier then
|
|
the linker will automatically see <a href="PROVIDE.html#PROVIDE">PROVIDE</a> two symbols:
|
|
__start_SECNAME and __stop_SECNAME, where SECNAME is the name of the
|
|
section. These indicate the start address and end address of the
|
|
orphaned section respectively. Note: most section names are not
|
|
representable as C identifiers because they contain a ‘<samp>.</samp>’
|
|
character.
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|