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| <a name="Standard-Target-Features"></a> |
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| Previous: <a href="Predefined-Target-Types.html#Predefined-Target-Types" accesskey="p" rel="prev">Predefined Target Types</a>, Up: <a href="Target-Descriptions.html#Target-Descriptions" accesskey="u" rel="up">Target Descriptions</a> [<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.4 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’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 — <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 ‘<samp>org.gnu.gdb.arm.core</samp>’. |
| </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. |
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| <tr><td align="left" valign="top">• <a href="AArch64-Features.html#AArch64-Features" accesskey="1">AArch64 Features</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="S_002f390-and-System-z-Features.html#S_002f390-and-System-z-Features" accesskey="9">S/390 and System z Features</a>:</td><td> </td><td align="left" valign="top"> |
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