101 lines
4.6 KiB
HTML
101 lines
4.6 KiB
HTML
<!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 GNU linker LD
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(Linaro_Binutils-2017.02)
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version 2.27.0.
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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
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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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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LD: Output Section Fill</title>
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<meta name="description" content="LD: Output Section Fill">
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<meta name="keywords" content="LD: Output Section Fill">
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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="LD-Index.html#LD-Index" rel="index" title="LD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Output-Section-Attributes.html#Output-Section-Attributes" rel="up" title="Output Section Attributes">
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<link href="Overlay-Description.html#Overlay-Description" rel="next" title="Overlay Description">
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<link href="Output-Section-Phdr.html#Output-Section-Phdr" rel="prev" title="Output Section Phdr">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.indentedblock {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nocodebreak {white-space:nowrap}
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span.nolinebreak {white-space:nowrap}
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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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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="Output-Section-Fill"></a>
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<div class="header">
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<p>
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Previous: <a href="Output-Section-Phdr.html#Output-Section-Phdr" accesskey="p" rel="prev">Output Section Phdr</a>, Up: <a href="Output-Section-Attributes.html#Output-Section-Attributes" accesskey="u" rel="up">Output Section Attributes</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>
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</div>
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<hr>
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<a name="Output-Section-Fill-1"></a>
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<h4 class="subsubsection">3.6.8.8 Output Section Fill</h4>
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<a name="index-_003dfillexp"></a>
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<a name="index-section-fill-pattern"></a>
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<a name="index-fill-pattern_002c-entire-section"></a>
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<p>You can set the fill pattern for an entire section by using
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‘<samp>=<var>fillexp</var></samp>’. <var>fillexp</var> is an expression
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(see <a href="Expressions.html#Expressions">Expressions</a>). Any otherwise unspecified regions of memory
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within the output section (for example, gaps left due to the required
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alignment of input sections) will be filled with the value, repeated as
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necessary. If the fill expression is a simple hex number, ie. a string
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of hex digit starting with ‘<samp>0x</samp>’ and without a trailing ‘<samp>k</samp>’ or ‘<samp>M</samp>’, then
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an arbitrarily long sequence of hex digits can be used to specify the
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fill pattern; Leading zeros become part of the pattern too. For all
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other cases, including extra parentheses or a unary <code>+</code>, the fill
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pattern is the four least significant bytes of the value of the
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expression. In all cases, the number is big-endian.
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</p>
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<p>You can also change the fill value with a <code>FILL</code> command in the
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output section commands; (see <a href="Output-Section-Data.html#Output-Section-Data">Output Section Data</a>).
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</p>
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<p>Here is a simple example:
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</p><div class="smallexample">
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<pre class="smallexample">SECTIONS { .text : { *(.text) } =0x90909090 }
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</pre></div>
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</body>
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</html>
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