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<h4 class="subsection">G.5.2 ARC Features</h4>

<p><a name="index-target-descriptions_002c-ARC-Features-3659"></a>
ARC processors are highly configurable, so even core registers and their number
are not completely predetermined.  In addition flags and PC registers which are
important to <span class="sc">gdb</span> are not &ldquo;core&rdquo; registers in ARC.  It is required
that one of the core registers features is present. 
&lsquo;<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>&rsquo; feature is mandatory.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>&rsquo; feature is required for ARC EM and ARC HS
targets with a normal register file.  It should contain registers &lsquo;<samp><span class="samp">r0</span></samp>&rsquo;
through &lsquo;<samp><span class="samp">r25</span></samp>&rsquo;, &lsquo;<samp><span class="samp">gp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">fp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">sp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">r30</span></samp>&rsquo;, &lsquo;<samp><span class="samp">blink</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">lp_count</span></samp>&rsquo; and &lsquo;<samp><span class="samp">pcl</span></samp>&rsquo;.  This feature may contain register &lsquo;<samp><span class="samp">ilink</span></samp>&rsquo;
and any of extension core registers &lsquo;<samp><span class="samp">r32</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r59/acch</span></samp>&rsquo;. 
&lsquo;<samp><span class="samp">ilink</span></samp>&rsquo; and extension core registers are not available to read/write, when
debugging GNU/Linux applications, thus &lsquo;<samp><span class="samp">ilink</span></samp>&rsquo; is made optional.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.arc.core-reduced.v2</span></samp>&rsquo; feature is required for ARC EM and
ARC HS targets with a reduced register file.  It should contain registers
&lsquo;<samp><span class="samp">r0</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r3</span></samp>&rsquo;, &lsquo;<samp><span class="samp">r10</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r15</span></samp>&rsquo;, &lsquo;<samp><span class="samp">gp</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">fp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">sp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">r30</span></samp>&rsquo;, &lsquo;<samp><span class="samp">blink</span></samp>&rsquo;, &lsquo;<samp><span class="samp">lp_count</span></samp>&rsquo; and &lsquo;<samp><span class="samp">pcl</span></samp>&rsquo;. 
This feature may contain register &lsquo;<samp><span class="samp">ilink</span></samp>&rsquo; and any of extension core
registers &lsquo;<samp><span class="samp">r32</span></samp>&rsquo; through &lsquo;<samp><span class="samp">r59/acch</span></samp>&rsquo;.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.arc.core.arcompact</span></samp>&rsquo; feature is required for ARCompact
targets with a normal register file.  It should contain registers &lsquo;<samp><span class="samp">r0</span></samp>&rsquo;
through &lsquo;<samp><span class="samp">r25</span></samp>&rsquo;, &lsquo;<samp><span class="samp">gp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">fp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">sp</span></samp>&rsquo;, &lsquo;<samp><span class="samp">r30</span></samp>&rsquo;, &lsquo;<samp><span class="samp">blink</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">lp_count</span></samp>&rsquo; and &lsquo;<samp><span class="samp">pcl</span></samp>&rsquo;.  This feature may contain registers
&lsquo;<samp><span class="samp">ilink1</span></samp>&rsquo;, &lsquo;<samp><span class="samp">ilink2</span></samp>&rsquo; and any of extension core registers &lsquo;<samp><span class="samp">r32</span></samp>&rsquo;
through &lsquo;<samp><span class="samp">r59/acch</span></samp>&rsquo;.  &lsquo;<samp><span class="samp">ilink1</span></samp>&rsquo; and &lsquo;<samp><span class="samp">ilink2</span></samp>&rsquo; and extension core
registers are not available when debugging GNU/Linux applications.  The only
difference with &lsquo;<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>&rsquo; feature is in the names of
&lsquo;<samp><span class="samp">ilink1</span></samp>&rsquo; and &lsquo;<samp><span class="samp">ilink2</span></samp>&rsquo; registers and that &lsquo;<samp><span class="samp">r30</span></samp>&rsquo; is mandatory in
ARC v2, but &lsquo;<samp><span class="samp">ilink2</span></samp>&rsquo; is optional on ARCompact.

   <p>The &lsquo;<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>&rsquo; feature is required for all ARC
targets.  It should contain registers &lsquo;<samp><span class="samp">pc</span></samp>&rsquo; and &lsquo;<samp><span class="samp">status32</span></samp>&rsquo;.

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