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| <h3 class="section">G.4 Standard Target Features</h3> |
| |
| <p><a name="index-target-descriptions_002c-standard-features-2553"></a> |
| A target description must contain either no registers or all the |
| target's registers. If the description contains no registers, then |
| <span class="sc">gdb</span> 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 <span class="sc">gdb</span> |
| can recognize them. |
| |
| <p>This is accomplished by giving specific names to feature elements |
| which contain standard registers. <span class="sc">gdb</span> 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, <span class="sc">gdb</span> will reject the target |
| description. You can add additional registers to any of the |
| standard features — <span class="sc">gdb</span> will display them just as if |
| they were added to an unrecognized feature. |
| |
| <p>This section lists the known features and their expected contents. |
| Sample XML documents for these features are included in the |
| <span class="sc">gdb</span> source tree, in the directory <samp><span class="file">gdb/features</span></samp>. |
| |
| <p>Names recognized by <span class="sc">gdb</span> 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><span class="samp">org.gnu.gdb.arm.core</span></samp>’. |
| |
| <p>The names of registers are not case sensitive for the purpose |
| of recognizing standard features, but <span class="sc">gdb</span> will only display |
| registers using the capitalization used in the description. |
| |
| <ul class="menu"> |
| <li><a accesskey="1" href="ARM-Features.html#ARM-Features">ARM Features</a> |
| <li><a accesskey="2" href="i386-Features.html#i386-Features">i386 Features</a> |
| <li><a accesskey="3" href="MIPS-Features.html#MIPS-Features">MIPS Features</a> |
| <li><a accesskey="4" href="M68K-Features.html#M68K-Features">M68K Features</a> |
| <li><a accesskey="5" href="PowerPC-Features.html#PowerPC-Features">PowerPC Features</a> |
| </ul> |
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