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| <h4 class="subsection">21.3.7 PowerPC Embedded</h4> |
| |
| <p><a name="index-DVC-register-1358"></a><span class="sc">gdb</span> supports using the DVC (Data Value Compare) register to |
| implement in hardware simple hardware watchpoint conditions of the form: |
| |
| <pre class="smallexample"> (gdb) watch <var>ADDRESS|VARIABLE</var> \ |
| if <var>ADDRESS|VARIABLE</var> == <var>CONSTANT EXPRESSION</var> |
| </pre> |
| <p>The DVC register will be automatically used whenever <span class="sc">gdb</span> detects |
| such pattern in a condition expression. This feature is available in native |
| <span class="sc">gdb</span> running on a Linux kernel version 2.6.34 or newer. |
| |
| <p><span class="sc">gdb</span> provides the following PowerPC-specific commands: |
| |
| |
| <a name="index-set-powerpc-1359"></a> |
| <dl><dt><code>set powerpc soft-float</code><dt><code>show powerpc soft-float</code><dd>Force <span class="sc">gdb</span> to use (or not use) a software floating point calling |
| convention. By default, <span class="sc">gdb</span> selects the calling convention based |
| on the selected architecture and the provided executable file. |
| |
| <br><dt><code>set powerpc vector-abi</code><dt><code>show powerpc vector-abi</code><dd>Force <span class="sc">gdb</span> to use the specified calling convention for vector |
| arguments and return values. The valid options are ‘<samp><span class="samp">auto</span></samp>’; |
| ‘<samp><span class="samp">generic</span></samp>’, to avoid vector registers even if they are present; |
| ‘<samp><span class="samp">altivec</span></samp>’, to use AltiVec registers; and ‘<samp><span class="samp">spe</span></samp>’ to use SPE |
| registers. By default, <span class="sc">gdb</span> selects the calling convention |
| based on the selected architecture and the provided executable file. |
| |
| <p><a name="index-target-dink32-1360"></a><br><dt><code>target dink32 </code><var>dev</var><dd>DINK32 ROM monitor. |
| |
| <p><a name="index-target-ppcbug-1361"></a><br><dt><code>target ppcbug </code><var>dev</var><dd><a name="index-target-ppcbug1-1362"></a><br><dt><code>target ppcbug1 </code><var>dev</var><dd>PPCBUG ROM monitor for PowerPC. |
| |
| <p><a name="index-target-sds-1363"></a><br><dt><code>target sds </code><var>dev</var><dd>SDS monitor, running on a PowerPC board (such as Motorola's ADS). |
| </dl> |
| |
| <p><a name="index-SDS-protocol-1364"></a>The following commands specific to the SDS protocol are supported |
| by <span class="sc">gdb</span>: |
| |
| <dl> |
| <dt><code>set sdstimeout </code><var>nsec</var><dd><a name="index-set-sdstimeout-1365"></a>Set the timeout for SDS protocol reads to be <var>nsec</var> seconds. The |
| default is 2 seconds. |
| |
| <br><dt><code>show sdstimeout</code><dd><a name="index-show-sdstimeout-1366"></a>Show the current value of the SDS timeout. |
| |
| <br><dt><code>sds </code><var>command</var><dd><a name="index-sds_0040r_007b_002c-a-command_007d-1367"></a>Send the specified <var>command</var> string to the SDS monitor. |
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