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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 defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></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></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"><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"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></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#1-137">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</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>
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<p>For rCore, we have a single trap entry point, namely <code>__alltraps</code>. At
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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>
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<p>All traps go through <code>__alltraps</code>, which is defined in <code>trap.S</code>. The
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assembly language code does just enough work restore the kernel space
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context, ensuring that Rust code safely runs, and transfers control to
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<a href="fn.trap_handler.html" title="trap_handler()"><code>trap_handler()</code></a>.</p>
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<p>It then calls different functionality based on what exactly the exception
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was. For example, timer interrupts trigger task preemption, and syscalls go
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to <a href="../syscall/fn.syscall.html" title="syscall()"><code>syscall()</code></a>.</p>
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</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"> 🔒</span> </div><div class="item-right docblock-short"><p>Implementation of <a href="context/struct.TrapContext.html" title="TrapContext"><code>TrapContext</code></a></p>
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</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 structure containing sstatus, sepc and registers</p>
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</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.enable_timer_interrupt.html" title="os::trap::enable_timer_interrupt fn">enable_timer_interrupt</a></div><div class="item-right docblock-short"><p>enable timer interrupt in sie CSR</p>
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</div></div><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>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.set_kernel_trap_entry.html" title="os::trap::set_kernel_trap_entry fn">set_kernel_trap_entry</a><span title="Restricted Visibility"> 🔒</span> </div><div class="item-right docblock-short"></div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.set_user_trap_entry.html" title="os::trap::set_user_trap_entry fn">set_user_trap_entry</a><span title="Restricted Visibility"> 🔒</span> </div><div class="item-right docblock-short"></div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.trap_from_kernel.html" title="os::trap::trap_from_kernel fn">trap_from_kernel</a></div><div class="item-right docblock-short"><p>Unimplement: traps/interrupts/exceptions from kernel mode
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Todo: Chapter 9: I/O device</p>
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</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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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.trap_return.html" title="os::trap::trap_return fn">trap_return</a></div><div class="item-right docblock-short"><p>set the new addr of __restore asm function in TRAMPOLINE page,
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set the reg a0 = trap_cx_ptr, reg a1 = phy addr of usr page table,
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finally, jump to new addr of __restore asm function</p>
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