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| <h5 class="subsubsection">3.6.8.8 Output Section Fill</h5> |
| |
| <p><a name="index-g_t_003d_0040var_007bfillexp_007d-459"></a><a name="index-section-fill-pattern-460"></a><a name="index-fill-pattern_002c-entire-section-461"></a>You can set the fill pattern for an entire section by using |
| ‘<samp><span class="samp">=</span><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><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 |
| 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-Section-Data">Output Section Data</a>). |
| |
| <p>Here is a simple example: |
| <pre class="smallexample"> SECTIONS { .text : { *(.text) } =0x90909090 } |
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