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<h1 class="menu-title">简明 zCore 教程</h1>
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<main>
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<h1 id="zircon-用户程序"><a class="header" href="#zircon-用户程序">Zircon 用户程序</a></h1>
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<h2 id="用户态启动流程"><a class="header" href="#用户态启动流程">用户态启动流程</a></h2>
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<blockquote>
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<p>kernel -> userboot -> bootsvc -> component_manager -> sh / device_manager</p>
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<p>ZBI 与 bootfs：ZBI 中包含初始文件系统 bootfs，内核将 ZBI 完整传递给 userboot，由它负责解析并对其它进程提供文件服务</p>
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</blockquote>
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<h2 id="用户程序的组成"><a class="header" href="#用户程序的组成">用户程序的组成</a></h2>
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<blockquote>
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<p>内核不直接参与用户程序的加载工作（第一个进程除外）</p>
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<p>用户程序强制使用 PIC 和 PIE（位置无关代码）</p>
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<p>内存地址空间组成：Program, Stack, vDSO, Dylibs</p>
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<p>通过 Channel 传递启动信息和句柄</p>
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</blockquote>
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<h2 id="加载-elf-文件"><a class="header" href="#加载-elf-文件">加载 ELF 文件</a></h2>
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<blockquote>
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<p>简单介绍 ELF 文件的组成结构</p>
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<p>实现 VmarExt::load_from_elf 函数</p>
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</blockquote>
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<h2 id="系统调用的跳板vdso"><a class="header" href="#系统调用的跳板vdso">系统调用的跳板：vDSO</a></h2>
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<blockquote>
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<p>介绍 vDSO 的作用</p>
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<p>如何修改 vDSO 源码（libzircon）将 syscall 改为函数调用</p>
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<p>加载 vDSO 时修改 vDSO 代码段，填入跳转地址</p>
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</blockquote>
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<h2 id="第一个用户程序userboot"><a class="header" href="#第一个用户程序userboot">第一个用户程序：userboot</a></h2>
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<blockquote>
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<p>实现 zircon-loader 中的 run_userboot 函数</p>
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<p>能够进入用户态并在第一个系统调用时跳转回来</p>
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