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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 “core” registers in ARC. It is required |
| that one of the core registers features is present. |
| ‘<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>’ feature is mandatory. |
| |
| <p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>’ feature is required for ARC EM and ARC HS |
| targets with a normal register file. It should contain registers ‘<samp><span class="samp">r0</span></samp>’ |
| through ‘<samp><span class="samp">r25</span></samp>’, ‘<samp><span class="samp">gp</span></samp>’, ‘<samp><span class="samp">fp</span></samp>’, ‘<samp><span class="samp">sp</span></samp>’, ‘<samp><span class="samp">r30</span></samp>’, ‘<samp><span class="samp">blink</span></samp>’, |
| ‘<samp><span class="samp">lp_count</span></samp>’ and ‘<samp><span class="samp">pcl</span></samp>’. This feature may contain register ‘<samp><span class="samp">ilink</span></samp>’ |
| and any of extension core registers ‘<samp><span class="samp">r32</span></samp>’ through ‘<samp><span class="samp">r59/acch</span></samp>’. |
| ‘<samp><span class="samp">ilink</span></samp>’ and extension core registers are not available to read/write, when |
| debugging GNU/Linux applications, thus ‘<samp><span class="samp">ilink</span></samp>’ is made optional. |
| |
| <p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core-reduced.v2</span></samp>’ feature is required for ARC EM and |
| ARC HS targets with a reduced register file. It should contain registers |
| ‘<samp><span class="samp">r0</span></samp>’ through ‘<samp><span class="samp">r3</span></samp>’, ‘<samp><span class="samp">r10</span></samp>’ through ‘<samp><span class="samp">r15</span></samp>’, ‘<samp><span class="samp">gp</span></samp>’, |
| ‘<samp><span class="samp">fp</span></samp>’, ‘<samp><span class="samp">sp</span></samp>’, ‘<samp><span class="samp">r30</span></samp>’, ‘<samp><span class="samp">blink</span></samp>’, ‘<samp><span class="samp">lp_count</span></samp>’ and ‘<samp><span class="samp">pcl</span></samp>’. |
| This feature may contain register ‘<samp><span class="samp">ilink</span></samp>’ and any of extension core |
| registers ‘<samp><span class="samp">r32</span></samp>’ through ‘<samp><span class="samp">r59/acch</span></samp>’. |
| |
| <p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core.arcompact</span></samp>’ feature is required for ARCompact |
| targets with a normal register file. It should contain registers ‘<samp><span class="samp">r0</span></samp>’ |
| through ‘<samp><span class="samp">r25</span></samp>’, ‘<samp><span class="samp">gp</span></samp>’, ‘<samp><span class="samp">fp</span></samp>’, ‘<samp><span class="samp">sp</span></samp>’, ‘<samp><span class="samp">r30</span></samp>’, ‘<samp><span class="samp">blink</span></samp>’, |
| ‘<samp><span class="samp">lp_count</span></samp>’ and ‘<samp><span class="samp">pcl</span></samp>’. This feature may contain registers |
| ‘<samp><span class="samp">ilink1</span></samp>’, ‘<samp><span class="samp">ilink2</span></samp>’ and any of extension core registers ‘<samp><span class="samp">r32</span></samp>’ |
| through ‘<samp><span class="samp">r59/acch</span></samp>’. ‘<samp><span class="samp">ilink1</span></samp>’ and ‘<samp><span class="samp">ilink2</span></samp>’ and extension core |
| registers are not available when debugging GNU/Linux applications. The only |
| difference with ‘<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>’ feature is in the names of |
| ‘<samp><span class="samp">ilink1</span></samp>’ and ‘<samp><span class="samp">ilink2</span></samp>’ registers and that ‘<samp><span class="samp">r30</span></samp>’ is mandatory in |
| ARC v2, but ‘<samp><span class="samp">ilink2</span></samp>’ is optional on ARCompact. |
| |
| <p>The ‘<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>’ feature is required for all ARC |
| targets. It should contain registers ‘<samp><span class="samp">pc</span></samp>’ and ‘<samp><span class="samp">status32</span></samp>’. |
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