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| <h5 class="subsubsection">9.7.2.2 Register Names</h5> |
| |
| <p><a name="index-BPF-register-names-862"></a><a name="index-register-names_002c-BPF-863"></a>The eBPF processor provides ten general-purpose 64-bit registers, |
| which are read-write, and a read-only frame pointer register: |
| |
| <dl> |
| <dt>‘<samp><span class="samp">%r0 .. %r9</span></samp>’<dd>General-purpose registers. |
| <br><dt>‘<samp><span class="samp">%r10</span></samp>’<dd>Frame pointer register. |
| </dl> |
| |
| <p>Some registers have additional names, to reflect their role in the |
| eBPF ABI: |
| |
| <dl> |
| <dt>‘<samp><span class="samp">%a</span></samp>’<dd>This is ‘<samp><span class="samp">%r0</span></samp>’. |
| <br><dt>‘<samp><span class="samp">%ctx</span></samp>’<dd>This is ‘<samp><span class="samp">%r6</span></samp>’. |
| <br><dt>‘<samp><span class="samp">%fp</span></samp>’<dd>This is ‘<samp><span class="samp">%r10</span></samp>’. |
| </dl> |
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