title: What does qword ptr [hexvalue] mean without a base register
body: <p>I was debugging CLR code in assembly, and got to a line</p>
  
  <pre><code>mov rax, qword ptr [ff4053c0h]
  </code></pre>
  
  <p>I think <code>qword ptr [ff4053c0h]</code> refers to a string I'm interested in, but <code>ff4053c0h</code> is not a valid memory location. Reading about <code>qword ptr</code> it seems to reference an address based on a base register (e.g. <code>qword ptr [rsp+30h]</code> is 30 bytes into the stack), but I can't find what it means with no base register.</p>