120 lines
5.5 KiB
HTML
120 lines
5.5 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>Memory Map Format - Debugging with GDB</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Debugging with GDB">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="Remote-Protocol.html#Remote-Protocol" title="Remote Protocol">
|
||
|
|
<link rel="prev" href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" title="Library List Format for SVR4 Targets">
|
||
|
|
<link rel="next" href="Thread-List-Format.html#Thread-List-Format" title="Thread List Format">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
Copyright (C) 1988-2019 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being ``Free Software'' and ``Free Software Needs
|
||
|
|
Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
|
||
|
|
and with the Back-Cover Texts as in (a) below.
|
||
|
|
|
||
|
|
(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
|
||
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
||
|
|
developing GNU and promoting software freedom.''
|
||
|
|
-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family:serif; font-weight:normal; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="Memory-Map-Format"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="Thread-List-Format.html#Thread-List-Format">Thread List Format</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets">Library List Format for SVR4 Targets</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h3 class="section">E.16 Memory Map Format</h3>
|
||
|
|
|
||
|
|
<p><a name="index-memory-map-format-3633"></a>
|
||
|
|
To be able to write into flash memory, <span class="sc">gdb</span> needs to obtain a
|
||
|
|
memory map from the target. This section describes the format of the
|
||
|
|
memory map.
|
||
|
|
|
||
|
|
<p>The memory map is obtained using the ‘<samp><span class="samp">qXfer:memory-map:read</span></samp>’
|
||
|
|
(see <a href="qXfer-memory-map-read.html#qXfer-memory-map-read">qXfer memory map read</a>) packet and is an XML document that
|
||
|
|
lists memory regions.
|
||
|
|
|
||
|
|
<p><span class="sc">gdb</span> must be linked with the Expat library to support XML
|
||
|
|
memory maps. See <a href="Expat.html#Expat">Expat</a>.
|
||
|
|
|
||
|
|
<p>The top-level structure of the document is shown below:
|
||
|
|
|
||
|
|
<pre class="smallexample"> <?xml version="1.0"?>
|
||
|
|
<!DOCTYPE memory-map
|
||
|
|
PUBLIC "+//IDN gnu.org//DTD GDB Memory Map V1.0//EN"
|
||
|
|
"http://sourceware.org/gdb/gdb-memory-map.dtd">
|
||
|
|
<memory-map>
|
||
|
|
region...
|
||
|
|
</memory-map>
|
||
|
|
</pre>
|
||
|
|
<p>Each region can be either:
|
||
|
|
|
||
|
|
<ul>
|
||
|
|
<li>A region of RAM starting at <var>addr</var> and extending for <var>length</var>
|
||
|
|
bytes from there:
|
||
|
|
|
||
|
|
<pre class="smallexample"> <memory type="ram" start="<var>addr</var>" length="<var>length</var>"/>
|
||
|
|
</pre>
|
||
|
|
<li>A region of read-only memory:
|
||
|
|
|
||
|
|
<pre class="smallexample"> <memory type="rom" start="<var>addr</var>" length="<var>length</var>"/>
|
||
|
|
</pre>
|
||
|
|
<li>A region of flash memory, with erasure blocks <var>blocksize</var>
|
||
|
|
bytes in length:
|
||
|
|
|
||
|
|
<pre class="smallexample"> <memory type="flash" start="<var>addr</var>" length="<var>length</var>">
|
||
|
|
<property name="blocksize"><var>blocksize</var></property>
|
||
|
|
</memory>
|
||
|
|
</pre>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<p>Regions must not overlap. <span class="sc">gdb</span> assumes that areas of memory not covered
|
||
|
|
by the memory map are RAM, and uses the ordinary ‘<samp><span class="samp">M</span></samp>’ and ‘<samp><span class="samp">X</span></samp>’
|
||
|
|
packets to write to addresses in such ranges.
|
||
|
|
|
||
|
|
<p>The formal DTD for memory map format is given below:
|
||
|
|
|
||
|
|
<pre class="smallexample"> <!-- ................................................... -->
|
||
|
|
<!-- Memory Map XML DTD ................................ -->
|
||
|
|
<!-- File: memory-map.dtd .............................. -->
|
||
|
|
<!-- .................................... .............. -->
|
||
|
|
<!-- memory-map.dtd -->
|
||
|
|
<!-- memory-map: Root element with versioning -->
|
||
|
|
<!ELEMENT memory-map (memory)*>
|
||
|
|
<!ATTLIST memory-map version CDATA #FIXED "1.0.0">
|
||
|
|
<!ELEMENT memory (property)*>
|
||
|
|
<!-- memory: Specifies a memory region,
|
||
|
|
and its type, or device. -->
|
||
|
|
<!ATTLIST memory type (ram|rom|flash) #REQUIRED
|
||
|
|
start CDATA #REQUIRED
|
||
|
|
length CDATA #REQUIRED>
|
||
|
|
<!-- property: Generic attribute tag -->
|
||
|
|
<!ELEMENT property (#PCDATA | property)*>
|
||
|
|
<!ATTLIST property name (blocksize) #REQUIRED>
|
||
|
|
</pre>
|
||
|
|
</body></html>
|
||
|
|
|