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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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| <a name="Output-Section-Fill-1"></a> |
| <h4 class="subsubsection">3.6.8.8 Output Section Fill</h4> |
| <a name="index-_003dfillexp"></a> |
| <a name="index-section-fill-pattern"></a> |
| <a name="index-fill-pattern_002c-entire-section"></a> |
| <p>You can set the fill pattern for an entire section by using |
| ‘<samp>=<var>fillexp</var></samp>’. <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 ‘<samp>0x</samp>’ and without a trailing ‘<samp>k</samp>’ or ‘<samp>M</samp>’, 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> |
| <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-Section-Data">Output Section Data</a>). |
| </p> |
| <p>Here is a simple example: |
| </p><div class="smallexample"> |
| <pre class="smallexample">SECTIONS { .text : { *(.text) } =0x90909090 } |
| </pre></div> |
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