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class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e1963-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/burnsys/burner_offline_lite.html" id="id-d5856e1963-link">离线烧录</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_display-d5856e2011" class="topicref" data-id="usb_display" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_display-d5856e2011-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/usb-display.html" id="usb_display-d5856e2011-link">USB Display 方案</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2119" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2119-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/peripheral/peripheral-intro.html" id="id-d5856e2119-link">外设移植</a><div class="wh-tooltip"><p class="shortdesc"><span class="ph">CTP、U 盘、SD 卡、有线和无线网络</span>等外设的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2244" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2244-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/bringup/chapter-bringup.html" id="id-d5856e2244-link">BringUp</a><div class="wh-tooltip"><p class="shortdesc">在硬件上电后快速初始化系统，为操作系统的启动准备好必要的硬件环境。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2345" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2345-link" class="wh-expand-btn"></span><div class="title"><a 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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">动态加载 (DM-APP)</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body body"><p class="- topic/p p" data-ofbid="d180481e19__20250121171625">动态模块（<span class="+ topic/keyword pr-d/parmname keyword parmname">Dynamic Module</span>，简称
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dm-app）机制允许开发者在运行时动态加载和卸载应用程序，而无需重新编译整个系统。目前该特性仅在 <span class="- topic/ph ph">Luban-Lite</span> 内核为 RT-Thread
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时支持。</p><p class="- topic/p p" data-ofbid="d180481e27__20250121171625"><span class="- topic/ph ph">Luban-Lite</span> 原生开发的映像为 <span class="+ topic/ph sw-d/filepath ph filepath">Kernel</span> ，使用 <span class="+ topic/keyword pr-d/parmname keyword parmname">Dynamic
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Module</span> 机制开发的应用为 <span class="+ topic/ph sw-d/filepath ph filepath">dm-app</span>。本节介绍 <span class="+ topic/keyword pr-d/parmname keyword parmname">Dynamic
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Module</span> 功能及其配置流程。</p><section class="- topic/section section" id="id__section_dzr_j1q_wcc" data-ofbid="id__section_dzr_j1q_wcc"><h2 class="- topic/title title sectiontitle">DM 原理说明</h2>
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<p class="- topic/p p" data-ofbid="d180481e51__20250121171625">在 Linux/ Windows 等大型系统中，应用和驱动通常可以独立开发并编译成 <span class="+ topic/ph sw-d/filepath ph filepath">ELF/EXE</span>
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文件，然后在目标系统上执行。<span class="- topic/ph ph">Luban-Lite</span> 使用动态模块 (Dynamic Module)
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机制来支持应用程序独立开发的需求，核心就是实现了 <span class="+ topic/ph sw-d/filepath ph filepath">ELF</span> 的链接和加载。基本原理如下：</p>
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<figure class="- topic/fig fig fignone" id="id__id29" data-ofbid="id__id29"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_tm1_4n5_fdc" src="../../../images/sdk/dm_design.png" width="480" alt="dm_design"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Dynamic Module 实现原理</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d180481e70__20250121171625">执行以下步骤，可以实现对动态模块的有效调试，确保能够在产品开发过程中灵活地进行二次开发和调试：</p>
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<ol class="- topic/ol ol arabic simple" id="id__ol_um1_4n5_fdc" data-ofbid="id__ol_um1_4n5_fdc"><li class="- topic/li li" data-ofbid="d180481e75__20250121171625">
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<div class="- topic/p p" data-ofbid="d180481e77__20250121171625">编译链接：使用 GCC 工具链（使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">-fPIC -shared</span> 选项），将应用源文件
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">main.c</span> 编译链接成 <span class="+ topic/ph sw-d/filepath ph filepath">ET_DYN</span> 格式的 ELF
|
||
文件，即 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 文件。<div class="- topic/note note note note_note" id="id__note_ung_rfb_pdc" data-ofbid="id__note_ung_rfb_pdc"><span class="note__title">注：</span> 必须使用
|
||
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">riscv-none-embed-gcc</span> 工具链，否则会导致编译不成功。</div></div>
|
||
<p class="- topic/p p" data-ofbid="d180481e97__20250121171625"><span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 是一个标准的 <span class="+ topic/ph sw-d/filepath ph filepath">ET_DYN</span> 格式 ELF
|
||
文件，位置无关且可动态链接。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d180481e105__20250121171625">
|
||
<p class="- topic/p p" data-ofbid="d180481e107__20250121171625">文件加载：在运行时，首先会把 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 文件的数据段代码段拷贝到内存当中。</p>
|
||
<p class="- topic/p p" data-ofbid="d180481e113__20250121171625">由于代码是是位置无关代码 (PIC)，可以从 <span class="+ topic/keyword pr-d/parmname keyword parmname">Heap</span>
|
||
中动态分配内存再进行代码拷贝。此时代码中还存在很多对系统函数的调用，需要重新定位重新链接后才能运行。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d180481e119__20250121171625">
|
||
<p class="- topic/p p" data-ofbid="d180481e121__20250121171625">动态链接：遍历 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 中的可重定位段，在内核的导出符号表
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">rtmsymtab</span>
|
||
中查询需要重定位的符号，并将查询到的绝对地址回填到可重定位符号的位置。至此完成动态链接，可以跳转到程序入口处执行。</p>
|
||
</li></ol>
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