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<title>Debugging with GDB: ARM Features</title>

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<a name="ARM-Features"></a>
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Next: <a href="i386-Features.html#i386-Features" accesskey="n" rel="next">i386 Features</a>, Previous: <a href="AArch64-Features.html#AArch64-Features" accesskey="p" rel="prev">AArch64 Features</a>, Up: <a href="Standard-Target-Features.html#Standard-Target-Features" accesskey="u" rel="up">Standard Target Features</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="ARM-Features-1"></a>
<h4 class="subsection">G.4.2 ARM Features</h4>
<a name="index-target-descriptions_002c-ARM-features"></a>

<p>The &lsquo;<samp>org.gnu.gdb.arm.core</samp>&rsquo; feature is required for non-M-profile
ARM targets.
It should contain registers &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r13</samp>&rsquo;, &lsquo;<samp>sp</samp>&rsquo;,
&lsquo;<samp>lr</samp>&rsquo;, &lsquo;<samp>pc</samp>&rsquo;, and &lsquo;<samp>cpsr</samp>&rsquo;.
</p>
<p>For M-profile targets (e.g. Cortex-M3), the &lsquo;<samp>org.gnu.gdb.arm.core</samp>&rsquo;
feature is replaced by &lsquo;<samp>org.gnu.gdb.arm.m-profile</samp>&rsquo;.  It should contain
registers &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r13</samp>&rsquo;, &lsquo;<samp>sp</samp>&rsquo;, &lsquo;<samp>lr</samp>&rsquo;, &lsquo;<samp>pc</samp>&rsquo;,
and &lsquo;<samp>xpsr</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.arm.fpa</samp>&rsquo; feature is optional.  If present, it
should contain registers &lsquo;<samp>f0</samp>&rsquo; through &lsquo;<samp>f7</samp>&rsquo; and &lsquo;<samp>fps</samp>&rsquo;.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.xscale.iwmmxt</samp>&rsquo; feature is optional.  If present,
it should contain at least registers &lsquo;<samp>wR0</samp>&rsquo; through &lsquo;<samp>wR15</samp>&rsquo; and
&lsquo;<samp>wCGR0</samp>&rsquo; through &lsquo;<samp>wCGR3</samp>&rsquo;.  The &lsquo;<samp>wCID</samp>&rsquo;, &lsquo;<samp>wCon</samp>&rsquo;,
&lsquo;<samp>wCSSF</samp>&rsquo;, and &lsquo;<samp>wCASF</samp>&rsquo; registers are optional.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.arm.vfp</samp>&rsquo; feature is optional.  If present, it
should contain at least registers &lsquo;<samp>d0</samp>&rsquo; through &lsquo;<samp>d15</samp>&rsquo;.  If
they are present, &lsquo;<samp>d16</samp>&rsquo; through &lsquo;<samp>d31</samp>&rsquo; should also be included.
<small>GDB</small> will synthesize the single-precision registers from
halves of the double-precision registers.
</p>
<p>The &lsquo;<samp>org.gnu.gdb.arm.neon</samp>&rsquo; feature is optional.  It does not
need to contain registers; it instructs <small>GDB</small> to display the
VFP double-precision registers as vectors and to synthesize the
quad-precision registers from pairs of double-precision registers.
If this feature is present, &lsquo;<samp>org.gnu.gdb.arm.vfp</samp>&rsquo; must also
be present and include 32 double-precision registers.
</p>


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