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69 lines
3.5 KiB
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69 lines
3.5 KiB
HTML
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<title>Output Section Fill - Untitled</title>
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<link rel="up" href="Output-Section-Attributes.html#Output-Section-Attributes" title="Output Section Attributes">
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<link rel="prev" href="Output-Section-Phdr.html#Output-Section-Phdr" title="Output Section Phdr">
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This file documents the GNU linker LD
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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<a name="Output-Section-Fill"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Output-Section-Phdr.html#Output-Section-Phdr">Output Section Phdr</a>,
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Up: <a rel="up" accesskey="u" href="Output-Section-Attributes.html#Output-Section-Attributes">Output Section Attributes</a>
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<h5 class="subsubsection">3.6.8.8 Output Section Fill</h5>
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<p><a name="index-g_t_003d_0040var_007bfillexp_007d-493"></a><a name="index-section-fill-pattern-494"></a><a name="index-fill-pattern_002c-entire-section-495"></a>You can set the fill pattern for an entire section by using
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‘<samp><span class="samp">=</span><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><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
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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>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>Here is a simple example:
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<pre class="smallexample"> SECTIONS { .text : { *(.text) } =0x90909090 }
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</pre>
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</body></html>
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