d>#SS(0)</td>
<td>
<p>If an attempt to pop a value off the stack violates the SS limit.</p>
<p>If an attempt to pop a value off the stack causes a non-canonical address to be referenced.</p></td></tr>
<tr>
<td>#NP(selector)</td>
<td>If the return code or stack segment is not present.</td></tr>
<tr>
<td>#PF(fault-code)</td>
<td>If a page fault occurs.</td></tr>
<tr>
<td>#AC(0)</td>
<td>If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.</td></tr>