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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"><title>os::trap - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-fa3bb1812debf86c.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="os" data-themes="" data-resource-suffix="" data-rustdoc-version="1.75.0-nightly (bf9a1c8a1 2023-10-08)" data-channel="nightly" data-search-js="search-5f5ec5419eadd0c9.js" data-settings-js="settings-74424d7eec62a23e.js" ><script src="../../static.files/storage-fec3eaa3851e447d.js"></script><script defer src="../../static.files/main-c5bd66d33317d69f.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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="logo-container" href="../../os/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a></nav><nav class="sidebar"><a class="logo-container" href="../../os/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><h2 class="location"><a href="#">Module trap</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></section></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">os</a>::<wbr><a class="mod" href="#">trap</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/os/trap/mod.rs.html#1-140">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="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="fn os::trap::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="fn os::trap::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="fn os::syscall::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><ul class="item-table"><li><div class="item-name"><a class="mod" href="context/index.html" title="mod os::trap::context">context</a><span title="Restricted Visibility"> 🔒</span> </div><div class="desc docblock-short">Implementation of <a href="context/struct.TrapContext.html" title="struct os::trap::context::TrapContext"><code>TrapContext</code></a></div></li></ul><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.TrapContext.html" title="struct os::trap::TrapContext">TrapContext</a></div><div class="desc docblock-short">trap context structure containing sstatus, sepc and registers</div></li></ul><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.enable_timer_interrupt.html" title="fn os::trap::enable_timer_interrupt">enable_timer_interrupt</a></div><div class="desc docblock-short">enable timer interrupt in sie CSR</div></li><li><div class="item-name"><a class="fn" href="fn.init.html" title="fn os::trap::init">init</a></div><div class="desc docblock-short">initialize CSR <code>stvec</code> as the entry of <code>__alltraps</code></div></li><li><div class="item-name"><a class="fn" href="fn.set_kernel_trap_entry.html" title="fn os::trap::set_kernel_trap_entry">set_kernel_trap_entry</a><span title="Restricted Visibility"> 🔒</span> </div></li><li><div class="item-name"><a class="fn" href="fn.set_user_trap_entry.html" title="fn os::trap::set_user_trap_entry">set_user_trap_entry</a><span title="Restricted Visibility"> 🔒</span> </div></li><li><div class="item-name"><a class="fn" href="fn.trap_from_kernel.html" title="fn os::trap::trap_from_kernel">trap_from_kernel</a></div><div class="desc docblock-short">Unimplement: traps/interrupts/exceptions from kernel mode
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Todo: Chapter 9: I/O device</div></li><li><div class="item-name"><a class="fn" href="fn.trap_handler.html" title="fn os::trap::trap_handler">trap_handler</a></div><div class="desc docblock-short">handle an interrupt, exception, or system call from user space</div></li><li><div class="item-name"><a class="fn" href="fn.trap_return.html" title="fn os::trap::trap_return">trap_return</a></div><div class="desc docblock-short">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</div></li></ul></section></div></main></body></html> |