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161 lines
7.1 KiB
HTML
161 lines
7.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Memory Map Format (Debugging with GDB)</title>
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<meta name="description" content="Memory Map Format (Debugging with GDB)">
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<meta name="keywords" content="Memory Map Format (Debugging with GDB)">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol">
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<link href="Thread-List-Format.html#Thread-List-Format" rel="next" title="Thread List Format">
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<a name="Memory-Map-Format"></a>
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<div class="header">
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<p>
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Next: <a href="Thread-List-Format.html#Thread-List-Format" accesskey="n" rel="next">Thread List Format</a>, Previous: <a href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" accesskey="p" rel="prev">Library List Format for SVR4 Targets</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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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</div>
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<hr>
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<a name="Memory-Map-Format-1"></a>
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<h3 class="section">E.16 Memory Map Format</h3>
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<a name="index-memory-map-format"></a>
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<p>To be able to write into flash memory, <small>GDB</small> needs to obtain a
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memory map from the target. This section describes the format of the
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memory map.
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</p>
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<p>The memory map is obtained using the ‘<samp>qXfer:memory-map:read</samp>’
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(see <a href="General-Query-Packets.html#qXfer-memory-map-read">qXfer memory map read</a>) packet and is an XML document that
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lists memory regions.
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</p>
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<p><small>GDB</small> must be linked with the Expat library to support XML
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memory maps. See <a href="Requirements.html#Expat">Expat</a>.
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</p>
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<p>The top-level structure of the document is shown below:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><?xml version="1.0"?>
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<!DOCTYPE memory-map
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PUBLIC "+//IDN gnu.org//DTD GDB Memory Map V1.0//EN"
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"http://sourceware.org/gdb/gdb-memory-map.dtd">
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<memory-map>
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region...
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</memory-map>
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</pre></div>
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<p>Each region can be either:
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</p>
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<ul>
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<li> A region of RAM starting at <var>addr</var> and extending for <var>length</var>
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bytes from there:
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<div class="smallexample">
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<pre class="smallexample"><memory type="ram" start="<var>addr</var>" length="<var>length</var>"/>
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</pre></div>
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</li><li> A region of read-only memory:
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<div class="smallexample">
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<pre class="smallexample"><memory type="rom" start="<var>addr</var>" length="<var>length</var>"/>
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</pre></div>
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</li><li> A region of flash memory, with erasure blocks <var>blocksize</var>
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bytes in length:
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<div class="smallexample">
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<pre class="smallexample"><memory type="flash" start="<var>addr</var>" length="<var>length</var>">
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<property name="blocksize"><var>blocksize</var></property>
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</memory>
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</pre></div>
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</li></ul>
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<p>Regions must not overlap. <small>GDB</small> assumes that areas of memory not covered
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by the memory map are RAM, and uses the ordinary ‘<samp>M</samp>’ and ‘<samp>X</samp>’
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packets to write to addresses in such ranges.
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</p>
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<p>The formal DTD for memory map format is given below:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><!-- ................................................... -->
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<!-- Memory Map XML DTD ................................ -->
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<!-- File: memory-map.dtd .............................. -->
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<!-- .................................... .............. -->
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<!-- memory-map.dtd -->
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<!-- memory-map: Root element with versioning -->
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<!ELEMENT memory-map (memory)*>
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<!ATTLIST memory-map version CDATA #FIXED "1.0.0">
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<!ELEMENT memory (property)*>
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<!-- memory: Specifies a memory region,
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and its type, or device. -->
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<!ATTLIST memory type (ram|rom|flash) #REQUIRED
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start CDATA #REQUIRED
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length CDATA #REQUIRED>
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<!-- property: Generic attribute tag -->
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<!ELEMENT property (#PCDATA | property)*>
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<!ATTLIST property name (blocksize) #REQUIRED>
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Thread-List-Format.html#Thread-List-Format" accesskey="n" rel="next">Thread List Format</a>, Previous: <a href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" accesskey="p" rel="prev">Library List Format for SVR4 Targets</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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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</div>
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</body>
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</html>
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