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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Trap handling functionality"><meta name="keywords" content="rust, rustlang, rust-lang, trap"><title>os::trap - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location"><a href="#">Module trap</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></div></section><div id="sidebar-vars" data-name="trap" data-ty="mod" data-relpath="./"></div><script defer src="./sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../os/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><div class="theme-picker hidden"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="22" height="22" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><div class="main-heading">
<h1 class="fqn"><span class="in-band">Module <a href="../index.html">os</a>::<wbr><a class="mod" href="#">trap</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/os/trap/mod.rs.html#1-68">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Trap handling functionality</p>
<p>For rCore, we have a single trap entry point, namely <code>__alltraps</code>. At
initialization in <a href="fn.init.html" title="init()"><code>init()</code></a>, we set the <code>stvec</code> CSR to point to it.</p>
<p>All traps go through <code>__alltraps</code>, which is defined in <code>trap.S</code>. The
assembly language code does just enough work restore the kernel space
context, ensuring that Rust code safely runs, and transfers control to
<a href="fn.trap_handler.html" title="trap_handler()"><code>trap_handler()</code></a>.</p>
<p>It then calls different functionality based on what exactly the exception
was. For example, timer interrupts trigger task preemption, and syscalls go
to <a href="../syscall/fn.syscall.html" title="syscall()"><code>syscall()</code></a>.</p>
</div></details><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="mod" href="context/index.html" title="os::trap::context mod">context</a><span title="Restricted Visibility">&nbsp;🔒</span> </div><div class="item-right docblock-short"></div></div></div><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.TrapContext.html" title="os::trap::TrapContext struct">TrapContext</a></div><div class="item-right docblock-short"><p>Trap Context</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.init.html" title="os::trap::init fn">init</a></div><div class="item-right docblock-short"><p>initialize CSR <code>stvec</code> as the entry of <code>__alltraps</code></p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.trap_handler.html" title="os::trap::trap_handler fn">trap_handler</a></div><div class="item-right docblock-short"><p>handle an interrupt, exception, or system call from user space</p>
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