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<TITLE>Debugging with GDB: Target Descriptions</TITLE>
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<H1> F. Target Descriptions </H1>
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<!--docid::SEC745::-->
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<P>
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<STRONG>Warning:</STRONG> target descriptions are still under active development,
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and the contents and format may change between GDB releases.
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The format is expected to stabilize in the future.
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</P><P>
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One of the challenges of using GDB to debug embedded systems
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is that there are so many minor variants of each processor
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architecture in use. It is common practice for vendors to start with
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a standard processor core -- ARM, PowerPC, or MIPS, for example ---
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and then make changes to adapt it to a particular market niche. Some
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architectures have hundreds of variants, available from dozens of
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vendors. This leads to a number of problems:
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</P><P>
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<UL>
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<LI>
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With so many different customized processors, it is difficult for
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the GDB maintainers to keep up with the changes.
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<LI>
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Since individual variants may have short lifetimes or limited
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audiences, it may not be worthwhile to carry information about every
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variant in the GDB source tree.
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<LI>
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When GDB does support the architecture of the embedded system
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at hand, the task of finding the correct architecture name to give the
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<CODE>set architecture</CODE> command can be error-prone.
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</UL>
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<P>
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To address these problems, the GDB remote protocol allows a
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target system to not only identify itself to GDB, but to
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actually describe its own features. This lets GDB support
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processor variants it has never seen before -- to the extent that the
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descriptions are accurate, and that GDB understands them.
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</P><P>
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GDB must be linked with the Expat library to support XML
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target descriptions. See <A HREF="gdb_31.html#Expat">Expat</A>.
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</P><P>
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<BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC746">F.1 Retrieving Descriptions</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">How descriptions are fetched from a target.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC747">F.2 Target Description Format</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">The contents of a target description.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC753">F.3 Predefined Target Types</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Standard types available for target
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descriptions.</TD></TR>
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<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC754">F.4 Standard Target Features</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP">Features GDB knows about.</TD></TR>
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</TABLE></BLOCKQUOTE>
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<P>
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<A NAME="Retrieving Descriptions"></A>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> F.1 Retrieving Descriptions </H2>
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<!--docid::SEC746::-->
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<P>
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Target descriptions can be read from the target automatically, or
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specified by the user manually. The default behavior is to read the
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description from the target. GDB retrieves it via the remote
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protocol using <SAMP>`qXfer'</SAMP> requests (see section <A HREF="gdb_33.html#SEC698">qXfer</A>). The <VAR>annex</VAR> in the <SAMP>`qXfer'</SAMP> packet will be
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<SAMP>`target.xml'</SAMP>. The contents of the <SAMP>`target.xml'</SAMP> annex are an
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XML document, of the form described in <A HREF="gdb_35.html#SEC747">F.2 Target Description Format</A>.
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</P><P>
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Alternatively, you can specify a file to read for the target description.
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If a file is set, the target will not be queried. The commands to
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specify a file are:
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</P><P>
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<DL COMPACT>
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<A NAME="IDX1655"></A>
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<DT><CODE>set tdesc filename <VAR>path</VAR></CODE>
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<DD>Read the target description from <VAR>path</VAR>.
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<P>
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<A NAME="IDX1656"></A>
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<DT><CODE>unset tdesc filename</CODE>
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<DD>Do not read the XML target description from a file. GDB
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will use the description supplied by the current target.
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<P>
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<A NAME="IDX1657"></A>
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<DT><CODE>show tdesc filename</CODE>
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<DD>Show the filename to read for a target description, if any.
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</DL>
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<P>
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<A NAME="Target Description Format"></A>
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<HR SIZE="6">
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<A NAME="SEC747"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> F.2 Target Description Format </H2>
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<!--docid::SEC747::-->
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<P>
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A target description annex is an <A HREF="http://www.w3.org/XML/">XML</A>
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document which complies with the Document Type Definition provided in
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the GDB sources in <TT>`gdb/features/gdb-target.dtd'</TT>. This
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means you can use generally available tools like <CODE>xmllint</CODE> to
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check that your feature descriptions are well-formed and valid.
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However, to help people unfamiliar with XML write descriptions for
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their targets, we also describe the grammar here.
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</P><P>
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Target descriptions can identify the architecture of the remote target
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and (for some architectures) provide information about custom register
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sets. GDB can use this information to autoconfigure for your
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target, or to warn you if you connect to an unsupported target.
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</P><P>
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Here is a simple target description:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><target version="1.0">
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<architecture>i386:x86-64</architecture>
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</target>
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</FONT></pre></td></tr></table></P><P>
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This minimal description only says that the target uses
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the x86-64 architecture.
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</P><P>
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A target description has the following overall form, with [ ] marking
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optional elements and <small>...</small> marking repeatable elements. The elements
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are explained further below.
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><?xml version="1.0"?>
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<!DOCTYPE target SYSTEM "gdb-target.dtd">
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<target version="1.0">
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[<VAR>architecture</VAR>]
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[<VAR>feature</VAR><small>...</small>]
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</target>
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</FONT></pre></td></tr></table></P><P>
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The description is generally insensitive to whitespace and line
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breaks, under the usual common-sense rules. The XML version
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declaration and document type declaration can generally be omitted
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(GDB does not require them), but specifying them may be
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useful for XML validation tools. The <SAMP>`version'</SAMP> attribute for
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<SAMP>`<target>'</SAMP> may also be omitted, but we recommend
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including it; if future versions of GDB use an incompatible
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revision of <TT>`gdb-target.dtd'</TT>, they will detect and report
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the version mismatch.
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</P><P>
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<HR SIZE="6">
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<A NAME="SEC748"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H3> F.2.1 Inclusion </H3>
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<!--docid::SEC748::-->
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<P>
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It can sometimes be valuable to split a target description up into
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several different annexes, either for organizational purposes, or to
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share files between different possible target descriptions. You can
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divide a description into multiple files by replacing any element of
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the target description with an inclusion directive of the form:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><xi:include href="<VAR>document</VAR>"/>
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</FONT></pre></td></tr></table></P><P>
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When GDB encounters an element of this form, it will retrieve
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the named XML <VAR>document</VAR>, and replace the inclusion directive with
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the contents of that document. If the current description was read
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using <SAMP>`qXfer'</SAMP>, then so will be the included document;
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<VAR>document</VAR> will be interpreted as the name of an annex. If the
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current description was read from a file, GDB will look for
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<VAR>document</VAR> as a file in the same directory where it found the
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original description.
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</P><P>
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<HR SIZE="6">
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<A NAME="SEC749"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H3> F.2.2 Architecture </H3>
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<!--docid::SEC749::-->
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<P>
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An <SAMP>`<architecture>'</SAMP> element has this form:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre> <architecture><VAR>arch</VAR></architecture>
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</FONT></pre></td></tr></table></P><P>
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<VAR>arch</VAR> is an architecture name from the same selection
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accepted by <CODE>set architecture</CODE> (see section <A HREF="gdb_17.html#SEC158">Specifying a Debugging Target</A>).
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</P><P>
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<HR SIZE="6">
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<A NAME="SEC750"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H3> F.2.3 Features </H3>
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<!--docid::SEC750::-->
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<P>
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Each <SAMP>`<feature>'</SAMP> describes some logical portion of the target
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system. Features are currently used to describe available CPU
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registers and the types of their contents. A <SAMP>`<feature>'</SAMP> element
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has this form:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><feature name="<VAR>name</VAR>">
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[<VAR>type</VAR><small>...</small>]
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<VAR>reg</VAR><small>...</small>
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</feature>
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</FONT></pre></td></tr></table></P><P>
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Each feature's name should be unique within the description. The name
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of a feature does not matter unless GDB has some special
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knowledge of the contents of that feature; if it does, the feature
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should have its standard name. See section <A HREF="gdb_35.html#SEC754">F.4 Standard Target Features</A>.
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</P><P>
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<HR SIZE="6">
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<A NAME="SEC751"></A>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H3> F.2.4 Types </H3>
|
|
<!--docid::SEC751::-->
|
|
<P>
|
|
|
|
Any register's value is a collection of bits which GDB must
|
|
interpret. The default interpretation is a two's complement integer,
|
|
but other types can be requested by name in the register description.
|
|
Some predefined types are provided by GDB (see section <A HREF="gdb_35.html#SEC753">F.3 Predefined Target Types</A>), and the description can define additional composite types.
|
|
</P><P>
|
|
|
|
Each type element must have an <SAMP>`id'</SAMP> attribute, which gives
|
|
a unique (within the containing <SAMP>`<feature>'</SAMP>) name to the type.
|
|
Types must be defined before they are used.
|
|
</P><P>
|
|
|
|
<A NAME="IDX1658"></A>
|
|
Some targets offer vector registers, which can be treated as arrays
|
|
of scalar elements. These types are written as <SAMP>`<vector>'</SAMP> elements,
|
|
specifying the array element type, <VAR>type</VAR>, and the number of elements,
|
|
<VAR>count</VAR>:
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><vector id="<VAR>id</VAR>" type="<VAR>type</VAR>" count="<VAR>count</VAR>"/>
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
<A NAME="IDX1659"></A>
|
|
If a register's value is usefully viewed in multiple ways, define it
|
|
with a union type containing the useful representations. The
|
|
<SAMP>`<union>'</SAMP> element contains one or more <SAMP>`<field>'</SAMP> elements,
|
|
each of which has a <VAR>name</VAR> and a <VAR>type</VAR>:
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><union id="<VAR>id</VAR>">
|
|
<field name="<VAR>name</VAR>" type="<VAR>type</VAR>"/>
|
|
<small>...</small>
|
|
</union>
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
<HR SIZE="6">
|
|
<A NAME="SEC752"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC751"> < </A>]</TD>
|
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|
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|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC753"> >> </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H3> F.2.5 Registers </H3>
|
|
<!--docid::SEC752::-->
|
|
<P>
|
|
|
|
Each register is represented as an element with this form:
|
|
</P><P>
|
|
|
|
<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre><reg name="<VAR>name</VAR>"
|
|
bitsize="<VAR>size</VAR>"
|
|
[regnum="<VAR>num</VAR>"]
|
|
[save-restore="<VAR>save-restore</VAR>"]
|
|
[type="<VAR>type</VAR>"]
|
|
[group="<VAR>group</VAR>"]/>
|
|
</FONT></pre></td></tr></table></P><P>
|
|
|
|
The components are as follows:
|
|
</P><P>
|
|
|
|
<DL COMPACT>
|
|
|
|
<DT><VAR>name</VAR>
|
|
<DD>The register's name; it must be unique within the target description.
|
|
<P>
|
|
|
|
<DT><VAR>bitsize</VAR>
|
|
<DD>The register's size, in bits.
|
|
<P>
|
|
|
|
<DT><VAR>regnum</VAR>
|
|
<DD>The register's number. If omitted, a register's number is one greater
|
|
than that of the previous register (either in the current feature or in
|
|
a preceeding feature); the first register in the target description
|
|
defaults to zero. This register number is used to read or write
|
|
the register; e.g. it is used in the remote <CODE>p</CODE> and <CODE>P</CODE>
|
|
packets, and registers appear in the <CODE>g</CODE> and <CODE>G</CODE> packets
|
|
in order of increasing register number.
|
|
<P>
|
|
|
|
<DT><VAR>save-restore</VAR>
|
|
<DD>Whether the register should be preserved across inferior function
|
|
calls; this must be either <CODE>yes</CODE> or <CODE>no</CODE>. The default is
|
|
<CODE>yes</CODE>, which is appropriate for most registers except for
|
|
some system control registers; this is not related to the target's
|
|
ABI.
|
|
<P>
|
|
|
|
<DT><VAR>type</VAR>
|
|
<DD>The type of the register. <VAR>type</VAR> may be a predefined type, a type
|
|
defined in the current feature, or one of the special types <CODE>int</CODE>
|
|
and <CODE>float</CODE>. <CODE>int</CODE> is an integer type of the correct size
|
|
for <VAR>bitsize</VAR>, and <CODE>float</CODE> is a floating point type (in the
|
|
architecture's normal floating point format) of the correct size for
|
|
<VAR>bitsize</VAR>. The default is <CODE>int</CODE>.
|
|
<P>
|
|
|
|
<DT><VAR>group</VAR>
|
|
<DD>The register group to which this register belongs. <VAR>group</VAR> must
|
|
be either <CODE>general</CODE>, <CODE>float</CODE>, or <CODE>vector</CODE>. If no
|
|
<VAR>group</VAR> is specified, GDB will not display the register
|
|
in <CODE>info registers</CODE>.
|
|
<P>
|
|
|
|
</DL>
|
|
<P>
|
|
|
|
<A NAME="Predefined Target Types"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC753"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC752"> < </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC754"> > </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC754"> << </A>]</TD>
|
|
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|
|
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|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H2> F.3 Predefined Target Types </H2>
|
|
<!--docid::SEC753::-->
|
|
<P>
|
|
|
|
Type definitions in the self-description can build up composite types
|
|
from basic building blocks, but can not define fundamental types. Instead,
|
|
standard identifiers are provided by GDB for the fundamental
|
|
types. The currently supported types are:
|
|
</P><P>
|
|
|
|
<DL COMPACT>
|
|
|
|
<DT><CODE>int8</CODE>
|
|
<DD><DT><CODE>int16</CODE>
|
|
<DD><DT><CODE>int32</CODE>
|
|
<DD><DT><CODE>int64</CODE>
|
|
<DD><DT><CODE>int128</CODE>
|
|
<DD>Signed integer types holding the specified number of bits.
|
|
<P>
|
|
|
|
<DT><CODE>uint8</CODE>
|
|
<DD><DT><CODE>uint16</CODE>
|
|
<DD><DT><CODE>uint32</CODE>
|
|
<DD><DT><CODE>uint64</CODE>
|
|
<DD><DT><CODE>uint128</CODE>
|
|
<DD>Unsigned integer types holding the specified number of bits.
|
|
<P>
|
|
|
|
<DT><CODE>code_ptr</CODE>
|
|
<DD><DT><CODE>data_ptr</CODE>
|
|
<DD>Pointers to unspecified code and data. The program counter and
|
|
any dedicated return address register may be marked as code
|
|
pointers; printing a code pointer converts it into a symbolic
|
|
address. The stack pointer and any dedicated address registers
|
|
may be marked as data pointers.
|
|
<P>
|
|
|
|
<DT><CODE>ieee_single</CODE>
|
|
<DD>Single precision IEEE floating point.
|
|
<P>
|
|
|
|
<DT><CODE>ieee_double</CODE>
|
|
<DD>Double precision IEEE floating point.
|
|
<P>
|
|
|
|
<DT><CODE>arm_fpa_ext</CODE>
|
|
<DD>The 12-byte extended precision format used by ARM FPA registers.
|
|
<P>
|
|
|
|
</DL>
|
|
<P>
|
|
|
|
<A NAME="Standard Target Features"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC754"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC753"> < </A>]</TD>
|
|
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|
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|
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|
|
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|
|
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|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H2> F.4 Standard Target Features </H2>
|
|
<!--docid::SEC754::-->
|
|
<P>
|
|
|
|
A target description must contain either no registers or all the
|
|
target's registers. If the description contains no registers, then
|
|
GDB 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 GDB
|
|
can recognize them.
|
|
</P><P>
|
|
|
|
This is accomplished by giving specific names to feature elements
|
|
which contain standard registers. GDB 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, GDB will reject the target
|
|
description. You can add additional registers to any of the
|
|
standard features -- GDB 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
|
|
GDB source tree, in the directory <TT>`gdb/features'</TT>.
|
|
</P><P>
|
|
|
|
Names recognized by GDB 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 GDB will only display
|
|
registers using the capitalization used in the description.
|
|
</P><P>
|
|
|
|
<BLOCKQUOTE><TABLE BORDER=0 CELLSPACING=0>
|
|
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC755">F.4.1 ARM Features</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP"></TD></TR>
|
|
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC756">F.4.2 MIPS Features</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP"></TD></TR>
|
|
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC757">F.4.3 M68K Features</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP"></TD></TR>
|
|
<TR><TD ALIGN="left" VALIGN="TOP"><A HREF="gdb_35.html#SEC758">F.4.4 PowerPC Features</A></TD><TD> </TD><TD ALIGN="left" VALIGN="TOP"></TD></TR>
|
|
</TABLE></BLOCKQUOTE>
|
|
<P>
|
|
|
|
<A NAME="ARM Features"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC755"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC754"> < </A>]</TD>
|
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|
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|
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|
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|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H3> F.4.1 ARM Features </H3>
|
|
<!--docid::SEC755::-->
|
|
<P>
|
|
|
|
The <SAMP>`org.gnu.gdb.arm.core'</SAMP> feature is required for ARM targets.
|
|
It should contain registers <SAMP>`r0'</SAMP> through <SAMP>`r13'</SAMP>, <SAMP>`sp'</SAMP>,
|
|
<SAMP>`lr'</SAMP>, <SAMP>`pc'</SAMP>, and <SAMP>`cpsr'</SAMP>.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.arm.fpa'</SAMP> feature is optional. If present, it
|
|
should contain registers <SAMP>`f0'</SAMP> through <SAMP>`f7'</SAMP> and <SAMP>`fps'</SAMP>.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.xscale.iwmmxt'</SAMP> feature is optional. If present,
|
|
it should contain at least registers <SAMP>`wR0'</SAMP> through <SAMP>`wR15'</SAMP> and
|
|
<SAMP>`wCGR0'</SAMP> through <SAMP>`wCGR3'</SAMP>. The <SAMP>`wCID'</SAMP>, <SAMP>`wCon'</SAMP>,
|
|
<SAMP>`wCSSF'</SAMP>, and <SAMP>`wCASF'</SAMP> registers are optional.
|
|
</P><P>
|
|
|
|
<A NAME="MIPS Features"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC756"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC755"> < </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC757"> > </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC757"> << </A>]</TD>
|
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|
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|
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|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
|
</TR></TABLE>
|
|
<H3> F.4.2 MIPS Features </H3>
|
|
<!--docid::SEC756::-->
|
|
<P>
|
|
|
|
The <SAMP>`org.gnu.gdb.mips.cpu'</SAMP> feature is required for MIPS targets.
|
|
It should contain registers <SAMP>`r0'</SAMP> through <SAMP>`r31'</SAMP>, <SAMP>`lo'</SAMP>,
|
|
<SAMP>`hi'</SAMP>, and <SAMP>`pc'</SAMP>. They may be 32-bit or 64-bit depending
|
|
on the target.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.mips.cp0'</SAMP> feature is also required. It should
|
|
contain at least the <SAMP>`status'</SAMP>, <SAMP>`badvaddr'</SAMP>, and <SAMP>`cause'</SAMP>
|
|
registers. They may be 32-bit or 64-bit depending on the target.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.mips.fpu'</SAMP> feature is currently required, though
|
|
it may be optional in a future version of GDB. It should
|
|
contain registers <SAMP>`f0'</SAMP> through <SAMP>`f31'</SAMP>, <SAMP>`fcsr'</SAMP>, and
|
|
<SAMP>`fir'</SAMP>. They may be 32-bit or 64-bit depending on the target.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.mips.linux'</SAMP> feature is optional. It should
|
|
contain a single register, <SAMP>`restart'</SAMP>, which is used by the
|
|
Linux kernel to control restartable syscalls.
|
|
</P><P>
|
|
|
|
<A NAME="M68K Features"></A>
|
|
<HR SIZE="6">
|
|
<A NAME="SEC757"></A>
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
|
|
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC756"> < </A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC758"> > </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC758"> << </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC754"> Up </A>]</TD>
|
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|
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H3> F.4.3 M68K Features </H3>
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<!--docid::SEC757::-->
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<P>
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|
|
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<DL COMPACT>
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<DT><CODE><SAMP>`org.gnu.gdb.m68k.core'</SAMP></CODE>
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<DD><DT><CODE><SAMP>`org.gnu.gdb.coldfire.core'</SAMP></CODE>
|
|
<DD><DT><CODE><SAMP>`org.gnu.gdb.fido.core'</SAMP></CODE>
|
|
<DD>One of those features must be always present.
|
|
The feature that is present determines which flavor of m86k is
|
|
used. The feature that is present should contain registers
|
|
<SAMP>`d0'</SAMP> through <SAMP>`d7'</SAMP>, <SAMP>`a0'</SAMP> through <SAMP>`a5'</SAMP>, <SAMP>`fp'</SAMP>,
|
|
<SAMP>`sp'</SAMP>, <SAMP>`ps'</SAMP> and <SAMP>`pc'</SAMP>.
|
|
<P>
|
|
|
|
<DT><CODE><SAMP>`org.gnu.gdb.coldfire.fp'</SAMP></CODE>
|
|
<DD>This feature is optional. If present, it should contain registers
|
|
<SAMP>`fp0'</SAMP> through <SAMP>`fp7'</SAMP>, <SAMP>`fpcontrol'</SAMP>, <SAMP>`fpstatus'</SAMP> and
|
|
<SAMP>`fpiaddr'</SAMP>.
|
|
</DL>
|
|
<P>
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|
|
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<A NAME="PowerPC Features"></A>
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<HR SIZE="6">
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<A NAME="SEC758"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC757"> < </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_36.html#SEC759"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC745"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC754"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_36.html#SEC759"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
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</TR></TABLE>
|
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<H3> F.4.4 PowerPC Features </H3>
|
|
<!--docid::SEC758::-->
|
|
<P>
|
|
|
|
The <SAMP>`org.gnu.gdb.power.core'</SAMP> feature is required for PowerPC
|
|
targets. It should contain registers <SAMP>`r0'</SAMP> through <SAMP>`r31'</SAMP>,
|
|
<SAMP>`pc'</SAMP>, <SAMP>`msr'</SAMP>, <SAMP>`cr'</SAMP>, <SAMP>`lr'</SAMP>, <SAMP>`ctr'</SAMP>, and
|
|
<SAMP>`xer'</SAMP>. They may be 32-bit or 64-bit depending on the target.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.power.fpu'</SAMP> feature is optional. It should
|
|
contain registers <SAMP>`f0'</SAMP> through <SAMP>`f31'</SAMP> and <SAMP>`fpscr'</SAMP>.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.power.altivec'</SAMP> feature is optional. It should
|
|
contain registers <SAMP>`vr0'</SAMP> through <SAMP>`vr31'</SAMP>, <SAMP>`vscr'</SAMP>,
|
|
and <SAMP>`vrsave'</SAMP>.
|
|
</P><P>
|
|
|
|
The <SAMP>`org.gnu.gdb.power.spe'</SAMP> feature is optional. It should
|
|
contain registers <SAMP>`ev0h'</SAMP> through <SAMP>`ev31h'</SAMP>, <SAMP>`acc'</SAMP>, and
|
|
<SAMP>`spefscr'</SAMP>. SPE targets should provide 32-bit registers in
|
|
<SAMP>`org.gnu.gdb.power.core'</SAMP> and provide the upper halves in
|
|
<SAMP>`ev0h'</SAMP> through <SAMP>`ev31h'</SAMP>. GDB will combine
|
|
these to present registers <SAMP>`ev0'</SAMP> through <SAMP>`ev31'</SAMP> to the
|
|
user.
|
|
</P><P>
|
|
|
|
<A NAME="Copying"></A>
|
|
<HR SIZE="6">
|
|
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_35.html#SEC745"> << </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_36.html#SEC759"> >> </A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb.html#SEC_Top">Top</A>]</TD>
|
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_38.html#SEC764">Index</A>]</TD>
|
|
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_abt.html#SEC_About"> ? </A>]</TD>
|
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</TR></TABLE>
|
|
<BR>
|
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<FONT SIZE="-1">
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<address>
|
|
|
|
<p>Please send FSF & GNU inquiries & questions to <a
|
|
href="mailto:gnu@gnu.org">gnu@gnu.org</a>. There are also <a
|
|
href="http://www.gnu.org/home.html#ContactInfo">other ways to
|
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contact</a> the FSF.</p>
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|
|
<p>These pages are maintained by <a
|
|
href="http://www.gnu.org/software/gdb/">the GDB developers</a>.</p>
|
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|
|
<p>Copyright Free Software Foundation, Inc., 59 Temple Place - Suite
|
|
330, Boston, MA 02111, USA.</p>
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|
|
<p>Verbatim copying and distribution of this entire article is
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permitted in any medium, provided this notice is preserved.</p>
|
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|
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</address>
|
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|
|
This document was generated
|
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by <I>GDB Administrator</I> on <I>March, 27 2008</I>
|
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