| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- Copyright (C) 1988-2015 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." --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Debugging with GDB: Memory Map Format</title> |
| |
| <meta name="description" content="Debugging with GDB: Memory Map Format"> |
| <meta name="keywords" content="Debugging with GDB: Memory Map Format"> |
| <meta name="resource-type" content="document"> |
| <meta name="distribution" content="global"> |
| <meta name="Generator" content="makeinfo"> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| <link href="index.html#Top" rel="start" title="Top"> |
| <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol"> |
| <link href="Thread-List-Format.html#Thread-List-Format" rel="next" title="Thread List Format"> |
| <link href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" rel="prev" title="Library List Format for SVR4 Targets"> |
| <style type="text/css"> |
| <!-- |
| a.summary-letter {text-decoration: none} |
| blockquote.smallquotation {font-size: smaller} |
| div.display {margin-left: 3.2em} |
| div.example {margin-left: 3.2em} |
| div.indentedblock {margin-left: 3.2em} |
| div.lisp {margin-left: 3.2em} |
| div.smalldisplay {margin-left: 3.2em} |
| div.smallexample {margin-left: 3.2em} |
| div.smallindentedblock {margin-left: 3.2em; font-size: smaller} |
| div.smalllisp {margin-left: 3.2em} |
| kbd {font-style:oblique} |
| pre.display {font-family: inherit} |
| pre.format {font-family: inherit} |
| pre.menu-comment {font-family: serif} |
| pre.menu-preformatted {font-family: serif} |
| pre.smalldisplay {font-family: inherit; font-size: smaller} |
| pre.smallexample {font-size: smaller} |
| pre.smallformat {font-family: inherit; font-size: smaller} |
| pre.smalllisp {font-size: smaller} |
| span.nocodebreak {white-space:nowrap} |
| span.nolinebreak {white-space:nowrap} |
| span.roman {font-family:serif; font-weight:normal} |
| span.sansserif {font-family:sans-serif; font-weight:normal} |
| ul.no-bullet {list-style: none} |
| --> |
| </style> |
| |
| |
| </head> |
| |
| <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="Memory-Map-Format"></a> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| <hr> |
| <a name="Memory-Map-Format-1"></a> |
| <h3 class="section">E.16 Memory Map Format</h3> |
| <a name="index-memory-map-format"></a> |
| |
| <p>To be able to write into flash memory, <small>GDB</small> needs to obtain a |
| memory map from the target. This section describes the format of the |
| memory map. |
| </p> |
| <p>The memory map is obtained using the ‘<samp>qXfer:memory-map:read</samp>’ |
| (see <a href="General-Query-Packets.html#qXfer-memory-map-read">qXfer memory map read</a>) packet and is an XML document that |
| lists memory regions. |
| </p> |
| <p><small>GDB</small> must be linked with the Expat library to support XML |
| memory maps. See <a href="Requirements.html#Expat">Expat</a>. |
| </p> |
| <p>The top-level structure of the document is shown below: |
| </p> |
| <div class="smallexample"> |
| <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></div> |
| |
| <p>Each region can be either: |
| </p> |
| <ul> |
| <li> A region of RAM starting at <var>addr</var> and extending for <var>length</var> |
| bytes from there: |
| |
| <div class="smallexample"> |
| <pre class="smallexample"><memory type="ram" start="<var>addr</var>" length="<var>length</var>"/> |
| </pre></div> |
| |
| |
| </li><li> A region of read-only memory: |
| |
| <div class="smallexample"> |
| <pre class="smallexample"><memory type="rom" start="<var>addr</var>" length="<var>length</var>"/> |
| </pre></div> |
| |
| |
| </li><li> A region of flash memory, with erasure blocks <var>blocksize</var> |
| bytes in length: |
| |
| <div class="smallexample"> |
| <pre class="smallexample"><memory type="flash" start="<var>addr</var>" length="<var>length</var>"> |
| <property name="blocksize"><var>blocksize</var></property> |
| </memory> |
| </pre></div> |
| |
| </li></ul> |
| |
| <p>Regions must not overlap. <small>GDB</small> assumes that areas of memory not covered |
| by the memory map are RAM, and uses the ordinary ‘<samp>M</samp>’ and ‘<samp>X</samp>’ |
| packets to write to addresses in such ranges. |
| </p> |
| <p>The formal DTD for memory map format is given below: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"><!-- ................................................... --> |
| <!-- Memory Map XML DTD ................................ --> |
| <!-- File: memory-map.dtd .............................. --> |
| <!-- .................................... .............. --> |
| <!-- memory-map.dtd --> |
| <!-- memory-map: Root element with versioning --> |
| <!ELEMENT memory-map (memory | property)> |
| <!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 CDATA #REQUIRED |
| start CDATA #REQUIRED |
| length CDATA #REQUIRED |
| device CDATA #IMPLIED> |
| <!-- property: Generic attribute tag --> |
| <!ELEMENT property (#PCDATA | property)*> |
| <!ATTLIST property name CDATA #REQUIRED> |
| </pre></div> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
