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77 lines
3.4 KiB
HTML
77 lines
3.4 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Orphan Sections - 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 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Expressions.html#Expressions" title="Expressions">
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<link rel="prev" href="Symbols.html#Symbols" title="Symbols">
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<link rel="next" href="Location-Counter.html#Location-Counter" title="Location Counter">
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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 2.26.
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Copyright (C) 1991-2015 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
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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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span.sansserif { font-family:sans-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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<a name="Orphan-Sections"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Location-Counter.html#Location-Counter">Location Counter</a>,
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Previous: <a rel="previous" accesskey="p" href="Symbols.html#Symbols">Symbols</a>,
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Up: <a rel="up" accesskey="u" href="Expressions.html#Expressions">Expressions</a>
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<hr>
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</div>
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<h4 class="subsection">3.10.4 Orphan Sections</h4>
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<p><a name="index-orphan-538"></a>Orphan sections are sections present in the input files which
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are not explicitly placed into the output file by the linker
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script. The linker will still copy these sections into the
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output file, but it has to guess as to where they should be
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placed. The linker uses a simple heuristic to do this. It
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attempts to place orphan sections after non-orphan sections of the
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same attribute, such as code vs data, loadable vs non-loadable, etc.
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If there is not enough room to do this then it places
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at the end of the file.
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<p>For ELF targets, the attribute of the section includes section type as
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well as section flag.
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<p>The command line options ‘<samp><span class="samp">--orphan-handling</span></samp>’ and ‘<samp><span class="samp">--unique</span></samp>’
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(see <a href="Options.html#Options">Command Line Options</a>) can be used to control which
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output sections an orphan is placed in.
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<p>If an orphaned section's name is representable as a C identifier then
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the linker will automatically see <a href="PROVIDE.html#PROVIDE">PROVIDE</a> two symbols:
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__start_SECNAME and __stop_SECNAME, where SECNAME is the name of the
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section. These indicate the start address and end address of the
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orphaned section respectively. Note: most section names are not
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representable as C identifiers because they contain a ‘<samp><span class="samp">.</span></samp>’
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character.
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</body></html>
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