152 lines
7.4 KiB
HTML
152 lines
7.4 KiB
HTML
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<head>
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<title>Debugging with GDB: Library List Format</title>
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<link href="index.html#Top" rel="start" title="Top">
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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="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" rel="next" title="Library List Format for SVR4 Targets">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Library-List-Format"></a>
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<div class="header">
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<p>
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Next: <a href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" accesskey="n" rel="next">Library List Format for SVR4 Targets</a>, Previous: <a href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension" accesskey="p" rel="previous">File-I/O Remote Protocol Extension</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="Library-List-Format-1"></a>
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<h3 class="section">E.14 Library List Format</h3>
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<a name="index-library-list-format_002c-remote-protocol"></a>
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<p>On some platforms, a dynamic loader (e.g. <samp>ld.so</samp>) runs in the
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same process as your application to manage libraries. In this case,
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<small>GDB</small> can use the loader’s symbol table and normal memory
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operations to maintain a list of shared libraries. On other
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platforms, the operating system manages loaded libraries.
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<small>GDB</small> can not retrieve the list of currently loaded libraries
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through memory operations, so it uses the ‘<samp>qXfer:libraries:read</samp>’
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packet (see <a href="General-Query-Packets.html#qXfer-library-list-read">qXfer library list read</a>) instead. The remote stub
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queries the target’s operating system and reports which libraries
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are loaded.
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</p>
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<p>The ‘<samp>qXfer:libraries:read</samp>’ packet returns an XML document which
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lists loaded libraries and their offsets. Each library has an
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associated name and one or more segment or section base addresses,
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which report where the library was loaded in memory.
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</p>
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<p>For the common case of libraries that are fully linked binaries, the
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library should have a list of segments. If the target supports
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dynamic linking of a relocatable object file, its library XML element
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should instead include a list of allocated sections. The segment or
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section bases are start addresses, not relocation offsets; they do not
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depend on the library’s link-time base addresses.
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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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library lists. See <a href="Requirements.html#Expat">Expat</a>.
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</p>
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<p>A simple memory map, with one loaded library relocated by a single
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offset, looks like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><library-list>
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<library name="/lib/libc.so.6">
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<segment address="0x10000000"/>
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</library>
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</library-list>
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</pre></div>
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<p>Another simple memory map, with one loaded library with three
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allocated sections (.text, .data, .bss), looks like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><library-list>
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<library name="sharedlib.o">
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<section address="0x10000000"/>
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<section address="0x20000000"/>
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<section address="0x30000000"/>
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</library>
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</library-list>
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</pre></div>
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<p>The format of a library list is described by this DTD:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><!-- library-list: Root element with versioning -->
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<!ELEMENT library-list (library)*>
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<!ATTLIST library-list version CDATA #FIXED "1.0">
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<!ELEMENT library (segment*, section*)>
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<!ATTLIST library name CDATA #REQUIRED>
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<!ELEMENT segment EMPTY>
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<!ATTLIST segment address CDATA #REQUIRED>
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<!ELEMENT section EMPTY>
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<!ATTLIST section address CDATA #REQUIRED>
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</pre></div>
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<p>In addition, segments and section descriptors cannot be mixed within a
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single library element, and you must supply at least one segment or
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section for each library.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Library-List-Format-for-SVR4-Targets.html#Library-List-Format-for-SVR4-Targets" accesskey="n" rel="next">Library List Format for SVR4 Targets</a>, Previous: <a href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension" accesskey="p" rel="previous">File-I/O Remote Protocol Extension</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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