e:</p>
<figure id="tbl-40-28">
<table>
<tr>
<th>Error Code (see <span class="not-imported">Table 40-4</span>)</th>
<th>Description</th></tr>
<tr>
<td>No Error</td>
<td>ELDB/ELDU successful.</td></tr>
<tr>
<td>SGX_MAC_COMPARE_FAIL</td>
<td>If the MAC check fails.</td></tr></table>
<figcaption><a href="./ELDB:ELDU:ELDBC:ELBUC.html#tbl-40-28">Table 40-28</a>. ELDB/ELDU/ELDBC/ELBUC Return Value in RAX</figcaption></figure>
<h3 id="concurrency-restrictions">Concurrency Restrictions<a class="anchor" href="#concur