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89 lines
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<title>ARC Features - Debugging with GDB</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Standard-Target-Features.html#Standard-Target-Features" title="Standard Target Features">
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<link rel="prev" href="AArch64-Features.html#AArch64-Features" title="AArch64 Features">
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<div class="node">
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<a name="ARC-Features"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="ARM-Features.html#ARM-Features">ARM Features</a>,
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Previous: <a rel="previous" accesskey="p" href="AArch64-Features.html#AArch64-Features">AArch64 Features</a>,
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Up: <a rel="up" accesskey="u" href="Standard-Target-Features.html#Standard-Target-Features">Standard Target Features</a>
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<hr>
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</div>
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<h4 class="subsection">G.5.2 ARC Features</h4>
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<p><a name="index-target-descriptions_002c-ARC-Features-3659"></a>
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ARC processors are highly configurable, so even core registers and their number
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are not completely predetermined. In addition flags and PC registers which are
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important to <span class="sc">gdb</span> are not “core” registers in ARC. It is required
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that one of the core registers features is present.
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‘<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>’ feature is mandatory.
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<p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>’ feature is required for ARC EM and ARC HS
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targets with a normal register file. It should contain registers ‘<samp><span class="samp">r0</span></samp>’
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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>’,
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‘<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>’
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and any of extension core registers ‘<samp><span class="samp">r32</span></samp>’ through ‘<samp><span class="samp">r59/acch</span></samp>’.
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‘<samp><span class="samp">ilink</span></samp>’ and extension core registers are not available to read/write, when
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debugging GNU/Linux applications, thus ‘<samp><span class="samp">ilink</span></samp>’ is made optional.
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<p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core-reduced.v2</span></samp>’ feature is required for ARC EM and
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ARC HS targets with a reduced register file. It should contain registers
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‘<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>’,
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‘<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>’.
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This feature may contain register ‘<samp><span class="samp">ilink</span></samp>’ and any of extension core
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registers ‘<samp><span class="samp">r32</span></samp>’ through ‘<samp><span class="samp">r59/acch</span></samp>’.
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<p>The ‘<samp><span class="samp">org.gnu.gdb.arc.core.arcompact</span></samp>’ feature is required for ARCompact
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targets with a normal register file. It should contain registers ‘<samp><span class="samp">r0</span></samp>’
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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>’,
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‘<samp><span class="samp">lp_count</span></samp>’ and ‘<samp><span class="samp">pcl</span></samp>’. This feature may contain registers
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‘<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>’
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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
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registers are not available when debugging GNU/Linux applications. The only
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difference with ‘<samp><span class="samp">org.gnu.gdb.arc.core.v2</span></samp>’ feature is in the names of
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‘<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
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ARC v2, but ‘<samp><span class="samp">ilink2</span></samp>’ is optional on ARCompact.
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<p>The ‘<samp><span class="samp">org.gnu.gdb.arc.aux-minimal</span></samp>’ feature is required for all ARC
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targets. It should contain registers ‘<samp><span class="samp">pc</span></samp>’ and ‘<samp><span class="samp">status32</span></samp>’.
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</body></html>
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