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<title>Debugging with GDB: Standard Target Features</title>

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<a name="Standard-Target-Features"></a>
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<p>
Previous: <a href="Enum-Target-Types.html#Enum-Target-Types" accesskey="p" rel="previous">Enum Target Types</a>, Up: <a href="Target-Descriptions.html#Target-Descriptions" accesskey="u" rel="up">Target Descriptions</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="Standard-Target-Features-1"></a>
<h3 class="section">G.5 Standard Target Features</h3>
<a name="index-target-descriptions_002c-standard-features"></a>

<p>A target description must contain either no registers or all the
target&rsquo;s registers.  If the description contains no registers, then
<small>GDB</small> will assume a default register layout, selected based on
the architecture.  If the description contains any registers, the
default layout will not be used; the standard registers must be
described in the target description, in such a way that <small>GDB</small>
can recognize them.
</p>
<p>This is accomplished by giving specific names to feature elements
which contain standard registers.  <small>GDB</small> will look for features
with those names and verify that they contain the expected registers;
if any known feature is missing required registers, or if any required
feature is missing, <small>GDB</small> will reject the target
description.  You can add additional registers to any of the
standard features &mdash; <small>GDB</small> will display them just as if
they were added to an unrecognized feature.
</p>
<p>This section lists the known features and their expected contents.
Sample XML documents for these features are included in the
<small>GDB</small> source tree, in the directory <samp>gdb/features</samp>.
</p>
<p>Names recognized by <small>GDB</small> should include the name of the
company or organization which selected the name, and the overall
architecture to which the feature applies; so e.g. the feature
containing ARM core registers is named &lsquo;<samp>org.gnu.gdb.arm.core</samp>&rsquo;.
</p>
<p>The names of registers are not case sensitive for the purpose
of recognizing standard features, but <small>GDB</small> will only display
registers using the capitalization used in the description.
</p>
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<tr><td align="left" valign="top">&bull; <a href="AArch64-Features.html#AArch64-Features" accesskey="1">AArch64 Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="ARC-Features.html#ARC-Features" accesskey="2">ARC Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="ARM-Features.html#ARM-Features" accesskey="3">ARM Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="i386-Features.html#i386-Features" accesskey="4">i386 Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="MicroBlaze-Features.html#MicroBlaze-Features" accesskey="5">MicroBlaze Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="MIPS-Features.html#MIPS-Features" accesskey="6">MIPS Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="M68K-Features.html#M68K-Features" accesskey="7">M68K Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="NDS32-Features.html#NDS32-Features" accesskey="8">NDS32 Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Nios-II-Features.html#Nios-II-Features" accesskey="9">Nios II Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="OpenRISC-1000-Features.html#OpenRISC-1000-Features">OpenRISC 1000 Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="PowerPC-Features.html#PowerPC-Features">PowerPC Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="RISC_002dV-Features.html#RISC_002dV-Features">RISC-V Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="RX-Features.html#RX-Features">RX Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="S_002f390-and-System-z-Features.html#S_002f390-and-System-z-Features">S/390 and System z Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Sparc-Features.html#Sparc-Features">Sparc Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="TIC6x-Features.html#TIC6x-Features">TIC6x Features</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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