📄 output-section-fill.html

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Node:<a name="Output%20Section%20Fill">Output Section Fill</a>,

Previous:<a rel="previous" accesskey="p" href="Output-Section-Phdr.html#Output%20Section%20Phdr">Output Section Phdr</a>,

Up:<a rel="up" accesskey="u" href="Output-Section-Attributes.html#Output%20Section%20Attributes">Output Section Attributes</a>

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<h5 class="subsubsection">Output section fill</h5>



   <p>You can set the fill pattern for an entire section by using

<code>=</code><var>fillexp</var><code></code>.  <var>fillexp</var> is an expression

(see <a href="Expressions.html#Expressions">Expressions</a>).  Any otherwise unspecified regions of memory

within the output section (for example, gaps left due to the required

alignment of input sections) will be filled with the value, repeated as

necessary.  If the fill expression is a simple hex number, ie. a string

of hex digit starting with <code>0x</code> and without a trailing <code>k</code> or <code>M</code>, then

an arbitrarily long sequence of hex digits can be used to specify the

fill pattern;  Leading zeros become part of the pattern too.  For all

other cases, including extra parentheses or a unary <code>+</code>, the fill

pattern is the four least significant bytes of the value of the

expression.  In all cases, the number is big-endian.



   <p>You can also change the fill value with a <code>FILL</code> command in the

output section commands; (see <a href="Output-Section-Data.html#Output%20Section%20Data">Output Section Data</a>).



   <p>Here is a simple example:

<pre class="smallexample">     SECTIONS { .text : { *(.text) } =0x90909090 }

     </pre>



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