1<html lang="en"> 2<head> 3<title>Output Section Fill - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Output-Section-Attributes.html#Output-Section-Attributes" title="Output Section Attributes"> 9<link rel="prev" href="Output-Section-Phdr.html#Output-Section-Phdr" title="Output Section Phdr"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12This file documents the GNU linker LD 13(Sourcery CodeBench Lite 2011.09-69) 14version 2.21.53. 15 16Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 172001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. 18 19Permission is granted to copy, distribute and/or modify this document 20under the terms of the GNU Free Documentation License, Version 1.3 21or any later version published by the Free Software Foundation; 22with no Invariant Sections, with no Front-Cover Texts, and with no 23Back-Cover Texts. A copy of the license is included in the 24section entitled ``GNU Free Documentation License''.--> 25<meta http-equiv="Content-Style-Type" content="text/css"> 26<style type="text/css"><!-- 27 pre.display { font-family:inherit } 28 pre.format { font-family:inherit } 29 pre.smalldisplay { font-family:inherit; font-size:smaller } 30 pre.smallformat { font-family:inherit; font-size:smaller } 31 pre.smallexample { font-size:smaller } 32 pre.smalllisp { font-size:smaller } 33 span.sc { font-variant:small-caps } 34 span.roman { font-family:serif; font-weight:normal; } 35 span.sansserif { font-family:sans-serif; font-weight:normal; } 36--></style> 37<link rel="stylesheet" type="text/css" href="../cs.css"> 38</head> 39<body> 40<div class="node"> 41<a name="Output-Section-Fill"></a> 42<p> 43Previous: <a rel="previous" accesskey="p" href="Output-Section-Phdr.html#Output-Section-Phdr">Output Section Phdr</a>, 44Up: <a rel="up" accesskey="u" href="Output-Section-Attributes.html#Output-Section-Attributes">Output Section Attributes</a> 45<hr> 46</div> 47 48<h5 class="subsubsection">3.6.8.8 Output Section Fill</h5> 49 50<p><a name="index-g_t_003d_0040var_007bfillexp_007d-469"></a><a name="index-section-fill-pattern-470"></a><a name="index-fill-pattern_002c-entire-section-471"></a>You can set the fill pattern for an entire section by using 51‘<samp><span class="samp">=</span><var>fillexp</var></samp>’. <var>fillexp</var> is an expression 52(see <a href="Expressions.html#Expressions">Expressions</a>). Any otherwise unspecified regions of memory 53within the output section (for example, gaps left due to the required 54alignment of input sections) will be filled with the value, repeated as 55necessary. If the fill expression is a simple hex number, ie. a string 56of hex digit starting with ‘<samp><span class="samp">0x</span></samp>’ and without a trailing ‘<samp><span class="samp">k</span></samp>’ or ‘<samp><span class="samp">M</span></samp>’, then 57an arbitrarily long sequence of hex digits can be used to specify the 58fill pattern; Leading zeros become part of the pattern too. For all 59other cases, including extra parentheses or a unary <code>+</code>, the fill 60pattern is the four least significant bytes of the value of the 61expression. In all cases, the number is big-endian. 62 63 <p>You can also change the fill value with a <code>FILL</code> command in the 64output section commands; (see <a href="Output-Section-Data.html#Output-Section-Data">Output Section Data</a>). 65 66 <p>Here is a simple example: 67<pre class="smallexample"> SECTIONS { .text : { *(.text) } =0x90909090 } 68</pre> 69 </body></html> 70 71