title: MCR and MRC does not exist on AARCH64?
body: <p>I am trying to compile "mrc" and "mcr" instruction on AARCH64 based on Board but I am seeing below error message</p>
  
  <pre><code>   tmp/ccqOHmrK.s: Assembler messages:
    /tmp/ccqOHmrK.s:43: Error: unknown mnemonic `mrc' -- `mrc p15,0,x0,c14,c3,1'
    /tmp/ccqOHmrK.s:53: Error: unknown mnemonic `mrc' -- `mrc p15,0,x2,c14,c3,0'
  </code></pre>
  
  <p>I tried looking into the kernel source /arch/arm64 but no where mcr&amp;&amp;mrc has been used without emulation.</p>
  
  <p>Is it some syntax issue?</p>