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<h4 class="mume-header" id="%E4%B8%80-%E4%BB%80%E4%B9%88%E6%98%AFld-linker-script">一、什么是ld linker script</h4>
<p>        程序链接时，目标文件根据一系列规则合并成可执行文件。这一步骤同时伴随着复杂的符号重定位、段合并和地址空间分配等步骤。</p>
<p>        <code>ld linker script</code>是<code>ld</code>提供的操作界面，用以对链接过程进行精确把控。使用<code>ld linker script</code>可以控制段的合并顺序、地址空间分配和链接符号导出。</p>
<h4 class="mume-header" id="%E4%BA%8C-%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81%E6%8E%8C%E6%8F%A1ld-linker-script">二、为什么需要掌握ld linker script</h4>
<p>        涉及<code>u-boot</code>和<code>kernel</code>开发时，编译产出需要根据硬件环境进行特殊适配。例如，需要把指定指令放入固定存储空间内。甚至编译产出为binary类型文件，对指令和数据的分配都有硬性要求。这些对编译产出的精确控制，都离不开<code>ld linker script</code>的帮助。</p>
<h4 class="mume-header" id="%E4%B8%89-%E5%8F%97%E4%BC%97%E7%BE%A4%E4%BD%93">三、受众群体</h4>
<p><code>ld linker script</code>主要面向<code>bootloader</code>、<code>kernel</code>、<code>soc</code>开发人员。这类环境需要对编译产出格式严格控制。另外应用开发仍然有必要了解这门技术，了解空间地址分配其对程序调试仍有裨益。</p>
<h4 class="mume-header" id="%E5%9B%9B-%E6%AD%A4%E5%8D%9A%E5%AE%A2%E6%9C%89%E5%93%AA%E4%BA%9B%E7%89%B9%E6%80%A7">四、此博客有哪些特性</h4>
<p>        毫无疑问地说，<code>ld linker script</code>仍然是十分冷门的技术，并且牵涉到大量底层的延伸技术细节。中文资料对这门技术的讲解仍然稀少，只有部分博客上有零零散散的介绍。</p>
<p>        此博客立足于现状，对整个技术做个全面介绍。所有章节都以<a href="https://sourceware.org/binutils/docs/ld/" title="https://sourceware.org/binutils/docs/ld/">官方文档(https://sourceware.org/binutils/docs/ld/)</a>为中心，每个章节对应目录都配有演示示例。建议读者仔细阅读示例，多动手尝试实现细节，从而提高掌握水平。</p>
<h4 class="mume-header" id="%E4%BA%94-%E6%88%91%E9%9C%80%E8%A6%81%E6%8E%8C%E6%8F%A1%E5%93%AA%E4%BA%9B%E6%8A%80%E6%9C%AF%E8%83%8C%E6%99%AF">五、我需要掌握哪些技术背景</h4>
<p>        此博客需要读者具备一定的C应用开发经验，对程序的执行加载有所了解。同事要求读者尽可能具备深入的<code>ELF</code>技术储备。</p>
<hr>
<p>文章地址：<a href="https://github.com/iDalink/ld-linker-script">https://github.com/iDalink/ld-linker-script</a></p>
<h3 class="mume-header" id="center%E7%AB%A0%E8%8A%82%E7%9B%AE%E5%BD%95center"><center>章节目录</center></h3>
<ul>
<li><em>01 基本概念</em></li>
<li><em>02 格式</em></li>
<li><em>03 简要示例</em></li>
<li><em>04 简要链接指令</em></li>
<li><em>05 符号值分配</em></li>
<li><em>06 SECTIONS指令</em></li>
<li><em>07 MEMORY指令</em></li>
<li><em>08 PHDRS指令</em></li>
<li><em>09 VERSION指令</em></li>
<li><em>10 Linker Scripts中的表达式</em></li>
</ul>
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