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66Previous: <a href="AArch64-Opcodes.html#AArch64-Opcodes" accesskey="p" rel="previous">AArch64 Opcodes</a>, Up: <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="u" rel="up">AArch64-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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69<a name="Mapping-Symbols"></a>
70<h4 class="subsection">9.1.7 Mapping Symbols</h4>
71
72<p>The AArch64 ELF specification requires that special symbols be inserted
73into object files to mark certain features:
74</p>
75<dl compact="compact">
76<dd>
77<a name="index-_0024x"></a>
78</dd>
79<dt><code>$x</code></dt>
80<dd><p>At the start of a region of code containing AArch64 instructions.
81</p>
82<a name="index-_0024d"></a>
83</dd>
84<dt><code>$d</code></dt>
85<dd><p>At the start of a region of data.
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