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76 lines
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<title>MIPS Embedded - Debugging with GDB</title>
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Next: <a rel="next" accesskey="n" href="OpenRISC-1000.html#OpenRISC-1000">OpenRISC 1000</a>,
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<h4 class="subsection">21.3.5 <acronym>MIPS</acronym> Embedded</h4>
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<p class="noindent"><span class="sc">gdb</span> supports these special commands for <acronym>MIPS</acronym> targets:
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<dl>
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<dt><code>set mipsfpu double</code><dt><code>set mipsfpu single</code><dt><code>set mipsfpu none</code><dt><code>set mipsfpu auto</code><dt><code>show mipsfpu</code><dd><a name="index-set-mipsfpu-1583"></a><a name="index-show-mipsfpu-1584"></a><a name="index-g_t_0040acronym_007bMIPS_007d-remote-floating-point-1585"></a><a name="index-floating-point_002c-_0040acronym_007bMIPS_007d-remote-1586"></a>If your target board does not support the <acronym>MIPS</acronym> floating point
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coprocessor, you should use the command ‘<samp><span class="samp">set mipsfpu none</span></samp>’ (if you
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need this, you may wish to put the command in your <span class="sc">gdb</span> init
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file). This tells <span class="sc">gdb</span> how to find the return value of
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functions which return floating point values. It also allows
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<span class="sc">gdb</span> to avoid saving the floating point registers when calling
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functions on the board. If you are using a floating point coprocessor
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with only single precision floating point support, as on the <span class="sc">r4650</span>
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processor, use the command ‘<samp><span class="samp">set mipsfpu single</span></samp>’. The default
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double precision floating point coprocessor may be selected using
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‘<samp><span class="samp">set mipsfpu double</span></samp>’.
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<p>In previous versions the only choices were double precision or no
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floating point, so ‘<samp><span class="samp">set mipsfpu on</span></samp>’ will select double precision
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and ‘<samp><span class="samp">set mipsfpu off</span></samp>’ will select no floating point.
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<p>As usual, you can inquire about the <code>mipsfpu</code> variable with
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‘<samp><span class="samp">show mipsfpu</span></samp>’.
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</dl>
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