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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/app/dm_app_gdb_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">GDB 调试</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 2 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d279703e26__20250121171751">使用 JTAG 调试器连接 SoC，并通过 DebugServer 提供的 GDB 调试接口可以调试 dm-app。以
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">test_dm_lib</span> 命令动态加载 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span>
为例，整个调试过程如下所示：<ol class="- topic/ol ol simple" id="dm_app_gdb_debug__ul_dnk_2n5_fdc" data-ofbid="dm_app_gdb_debug__ul_dnk_2n5_fdc"><li class="- topic/li li" data-ofbid="d279703e35__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e37__20250121171751">在 GDB 中给系统函数 <span class="+ topic/keyword pr-d/apiname keyword apiname">dlmodule_load()</span>
打上断点：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_enk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_enk_2n5_fdc">(gdb) b dlmodule_load
</pre></div>
</li><li class="- topic/li li" data-ofbid="d279703e45__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e47__20250121171751">在串口 Shell
中执行下列测试启动命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_gnk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_gnk_2n5_fdc">test_dm_lib</pre></div>
</li><li class="- topic/li li" data-ofbid="d279703e52__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e54__20250121171751">GDB 中断在 <span class="+ topic/keyword pr-d/apiname keyword apiname">dlmodule_load()</span> 入口以后，输入 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">finish</span>
命令让 <span class="+ topic/keyword pr-d/apiname keyword apiname">dlmodule_load()</span>
执行完成：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_ink_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_ink_2n5_fdc">(gdb) finish</pre></div>
</li><li class="- topic/li li" data-ofbid="d279703e68__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e70__20250121171751">记录串口 Shell
上打印出来的模块动态加载基地址：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_knk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_knk_2n5_fdc">test_dm_lib</pre></div>
<div class="- topic/p p" data-ofbid="d279703e75__20250121171751">动态模块的基地址会在加载函数 <code class="+ topic/ph pr-d/codeph ph codeph">dlmodule_load()</code>
加载完动态模块后，打印出当前模块的基地址。例如，下列输出示例中，基地址为
0x404f8c80：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_wlk_hnm_tdc" data-ofbid="dm_app_gdb_debug__codeblock_wlk_hnm_tdc"><span class="hl-number">01</span>-<span class="hl-number">01</span> <span class="hl-number">10</span>:<span class="hl-number">05</span>:<span class="hl-number">30</span> I/NO_TAG: Module: load /sdcard/hello.so to <span class="hl-number">0x404f8c80</span> succeed.
[AIC-DM-APP] init!</pre></div>
</li><li class="- topic/li li" data-ofbid="d279703e83__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e85__20250121171751">通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">readelf</span> 命令读取 ELF 文件 <code class="+ topic/ph pr-d/codeph ph codeph">.text</code>
段的偏移：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_mnk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_mnk_2n5_fdc">readelf -S hello/hello.so</pre></div>
<div class="- topic/p p" data-ofbid="d279703e96__20250121171751">输出示例如下，<code class="+ topic/ph pr-d/codeph ph codeph">.text</code> 的 Address 字段为
'0x550'：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_ocb_3nm_tdc" data-ofbid="dm_app_gdb_debug__codeblock_ocb_3nm_tdc">Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
...
[<span class="hl-number">7</span>] .text PROGBITS <span class="hl-number">000000000000055000000550</span>
<span class="hl-number">000000000000008e</span> <span class="hl-number">0000000000000000</span> AX <span class="hl-number">002</span>
...
</pre></div>
</li><li class="- topic/li li" data-ofbid="d279703e104__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e106__20250121171751">根据已经获得的动态加载地址和 <code class="+ topic/ph pr-d/codeph ph codeph">.text</code> 段偏移，使用下列公式计算出 <code class="+ topic/ph pr-d/codeph ph codeph">add-symbol-file
hello.so xxx</code>
的基地址：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_jfj_dp5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_jfj_dp5_fdc"><span class="hl-number">0x404f8c80</span> + <span class="hl-number">0x550</span> = <span class="hl-number">0x404F91D0</span></pre></div>
<p class="- topic/p p" data-ofbid="d279703e117__20250121171751">计算出 <code class="+ topic/ph pr-d/codeph ph codeph">.text</code> 的动态基地址为 0x404F91D0，</p>
</li><li class="- topic/li li" data-ofbid="d279703e123__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e125__20250121171751">使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">add-symbol-file</span> 命令在 GDB 中加载
<span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span>
符号表：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_pnk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_pnk_2n5_fdc">(gdb) add-symbol-file aic-dm-apps/hello/hello.so <span class="hl-number">0x404F91D0</span>
</pre></div>
<p class="- topic/p p" data-ofbid="d279703e136__20250121171751">GDB 就会根据给定的基地址加载 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 的符号表。</p>
</li><li class="- topic/li li" data-ofbid="d279703e142__20250121171751">
<p class="- topic/p p" data-ofbid="d279703e144__20250121171751">为了能够调试动态模块，需要在编译时保留原始 ELF 文件中的调试信息，详情可查看 <a class="- topic/xref xref" href="dm_app_gdb_debug.html#dm_app_gdb_debug__elf">保留 ELF 调试信息</a>。</p>
</li><li class="- topic/li li" data-ofbid="d279703e151__20250121171751">
<div class="- topic/p p" data-ofbid="d279703e153__20250121171751">在 GDB 中跳转到 <span class="+ topic/keyword pr-d/apiname keyword apiname">my_thread_init()</span>
函数，并根据需求开始调试：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_rnk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_rnk_2n5_fdc">(gdb) n
<span class="hl-number">30</span> func();(gdb) s
my_thread_init () at hello/rtt_api_test.c:<span class="hl-number">18</span>
<span class="hl-number">18</span>tid= rt_thread_create(<span class="hl-string">"tMyTask"</span>, my_thread_entry, RT_NULL</pre></div>
</li></ol></div><section class="- topic/section section" id="dm_app_gdb_debug__elf" data-ofbid="dm_app_gdb_debug__elf"><h2 class="- topic/title title sectiontitle">保留 ELF 调试信息</h2>
<p class="- topic/p p" data-ofbid="d279703e166__20250121171751">为了能够调试动态模块，需要在编译时保留原始 ELF 文件中的调试信息。</p>
<div class="- topic/p p" data-ofbid="d279703e169__20250121171751"><span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 和 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 原始 ELF 文件中含有 debug
信息，为了减少动态加载时的内存大小，需要临时注释掉 <span class="+ topic/ph sw-d/filepath ph filepath">rtconfig.py</span> 文件中的
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">strip</span> 动作
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">M_POST_ACTION</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_gdb_debug__codeblock_zmk_2n5_fdc" data-ofbid="dm_app_gdb_debug__codeblock_zmk_2n5_fdc">M_POST_ACTION = M_STRIP + <span class="hl-string">' -R .hash $TARGET\n'</span> + M_SIZE + <span class="hl-string">' $TARGET \n'</span></pre><ul class="- topic/ul ul" id="dm_app_gdb_debug__ul_pqw_s5s_vcc" data-ofbid="dm_app_gdb_debug__ul_pqw_s5s_vcc"><li class="- topic/li li" data-ofbid="d279703e189__20250121171751">如果 <code class="+ topic/ph pr-d/codeph ph codeph">aic-dm-apps</code> 位于 <span class="- topic/ph ph">Luban-Lite</span> 项目的
<span class="+ topic/ph sw-d/filepath ph filepath">\bsp\artinchip\sys\dm\</span> 目录下，修改该目录下的
<span class="+ topic/ph sw-d/filepath ph filepath">rtconfig.py</span> 文件。</li><li class="- topic/li li" data-ofbid="d279703e203__20250121171751">如果 <code class="+ topic/ph pr-d/codeph ph codeph">aic-dm-apps</code> 已从 Luban-Lite 项目中拷贝出来，则修改该文件
<span class="+ topic/ph sw-d/filepath ph filepath">aic-dm-apps\tools\sdk\</span> 目录下的
<span class="+ topic/ph sw-d/filepath ph filepath">rtconfig.py</span> 文件。</li></ul></div>
<p class="- topic/p p" data-ofbid="d279703e215__20250121171751">重新运行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --app=hello</span> 或者 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --lib=hello</span>
，编译出来的 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 或者 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> ELF 文件就会带
debug 调试信息。</p>
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