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authorjohannst <johannst@users.noreply.github.com>2023-02-27 22:52:40 +0000
committerjohannst <johannst@users.noreply.github.com>2023-02-27 22:52:40 +0000
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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="Source of the Rust file `src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-1f7d512b176f0f72.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-124a1ca42af929b6.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-6827029ac823cab7.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../static.files/light-ebce58d0a40c3431.css"><link rel="stylesheet" disabled href="../../static.files/dark-f23faae4a2daf9a6.css"><link rel="stylesheet" disabled href="../../static.files/ayu-8af5e100b21cd173.css"><script id="default-settings" ></script><script src="../../static.files/storage-d43fa987303ecbbb.js"></script><script defer src="../../static.files/source-script-5cf2e01a42cc9858.js"></script><script defer src="../../source-files.js"></script><script defer src="../../static.files/main-c55e1eb52e1886b4.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-13285aec31fa243e.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 source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../juicebox_asm/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><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-5ec35bf9ca753509.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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+</pre><pre class="rust"><code><span class="kw">pub mod </span>prelude;
+<span class="kw">pub mod </span>rt;
+
+<span class="kw">mod </span>imm;
+<span class="kw">mod </span>insn;
+<span class="kw">mod </span>label;
+<span class="kw">mod </span>reg;
+
+<span class="kw">use </span>imm::Imm;
+<span class="kw">use </span>label::Label;
+<span class="kw">use </span>reg::Reg;
+<span class="kw">use </span>reg::{Reg16, Reg32, Reg64, Reg8};
+
+<span class="kw">pub enum </span>MemOp {
+ Indirect(Reg64),
+ IndirectDisp(Reg64, i32),
+}
+
+<span class="kw">impl </span>MemOp {
+ <span class="kw">const fn </span>base(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Reg64 {
+ <span class="kw">match </span><span class="self">self </span>{
+ MemOp::Indirect(base) =&gt; <span class="kw-2">*</span>base,
+ MemOp::IndirectDisp(base, ..) =&gt; <span class="kw-2">*</span>base,
+ }
+ }
+}
+
+<span class="doccomment">/// Encode the `REX` byte.
+</span><span class="kw">const fn </span>rex(w: bool, r: u8, x: u8, b: u8) -&gt; u8 {
+ <span class="kw">let </span>w = <span class="kw">if </span>w { <span class="number">1 </span>} <span class="kw">else </span>{ <span class="number">0 </span>};
+ <span class="kw">let </span>r = (r &gt;&gt; <span class="number">3</span>) &amp; <span class="number">1</span>;
+ <span class="kw">let </span>x = (x &gt;&gt; <span class="number">3</span>) &amp; <span class="number">1</span>;
+ <span class="kw">let </span>b = (b &gt;&gt; <span class="number">3</span>) &amp; <span class="number">1</span>;
+ <span class="number">0b0100_0000 </span>| ((w &amp; <span class="number">1</span>) &lt;&lt; <span class="number">3</span>) | (r &lt;&lt; <span class="number">2</span>) | (x &lt;&lt; <span class="number">1</span>) | b
+}
+
+<span class="doccomment">/// Encode the `ModR/M` byte.
+</span><span class="kw">const fn </span>modrm(mod_: u8, reg: u8, rm: u8) -&gt; u8 {
+ ((mod_ &amp; <span class="number">0b11</span>) &lt;&lt; <span class="number">6</span>) | ((reg &amp; <span class="number">0b111</span>) &lt;&lt; <span class="number">3</span>) | (rm &amp; <span class="number">0b111</span>)
+}
+
+<span class="kw">pub struct </span>Asm {
+ buf: Vec&lt;u8&gt;,
+}
+
+<span class="kw">impl </span>Asm {
+ <span class="kw">pub fn </span>new() -&gt; Asm {
+ <span class="kw">let </span>buf = Vec::with_capacity(<span class="number">1024</span>);
+ Asm { buf }
+ }
+
+ <span class="kw">pub fn </span>into_code(<span class="self">self</span>) -&gt; Vec&lt;u8&gt; {
+ <span class="self">self</span>.buf
+ }
+
+ <span class="kw">fn </span>emit(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8]) {
+ <span class="self">self</span>.buf.extend_from_slice(bytes);
+ }
+
+ <span class="kw">fn </span>emit_optional(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[<span class="prelude-ty">Option</span>&lt;u8&gt;]) {
+ <span class="kw">for </span>byte <span class="kw">in </span>bytes.iter().filter_map(|<span class="kw-2">&amp;</span>b| b) {
+ <span class="self">self</span>.buf.push(byte);
+ }
+ }
+
+ <span class="kw">fn </span>emit_at(<span class="kw-2">&amp;mut </span><span class="self">self</span>, pos: usize, bytes: <span class="kw-2">&amp;</span>[u8]) {
+ <span class="kw">if let </span><span class="prelude-val">Some</span>(buf) = <span class="self">self</span>.buf.get_mut(pos..pos + bytes.len()) {
+ buf.copy_from_slice(bytes);
+ } <span class="kw">else </span>{
+ <span class="macro">unimplemented!</span>();
+ }
+ }
+
+ <span class="doccomment">/// Bind the [Label] to the current location.
+ </span><span class="kw">pub fn </span>bind(<span class="kw-2">&amp;mut </span><span class="self">self</span>, label: <span class="kw-2">&amp;mut </span>Label) {
+ <span class="comment">// Bind the label to the current offset.
+ </span>label.bind(<span class="self">self</span>.buf.len());
+
+ <span class="comment">// Resolve any pending relocations for the label.
+ </span><span class="self">self</span>.resolve(label);
+ }
+
+ <span class="doccomment">/// If the [Label] is bound, patch any pending relocation.
+ </span><span class="kw">pub fn </span>resolve(<span class="kw-2">&amp;mut </span><span class="self">self</span>, label: <span class="kw-2">&amp;mut </span>Label) {
+ <span class="kw">if let </span><span class="prelude-val">Some</span>(loc) = label.location() {
+ <span class="kw">let </span>loc = i32::try_from(loc).expect(<span class="string">&quot;Label location did not fit into i32.&quot;</span>);
+
+ <span class="comment">// Resolve any pending relocations for the label.
+ </span><span class="kw">for </span>off <span class="kw">in </span>label.offsets_mut().drain() {
+ <span class="comment">// Displacement is relative to the next instruction following the jump.
+ // We record the offset to patch at the first byte of the disp32 therefore we need
+ // to account for that in the disp computation.
+ </span><span class="kw">let </span>disp32 = loc - i32::try_from(off).expect(<span class="string">&quot;Label offset did not fit into i32&quot;</span>) - <span class="number">4 </span><span class="comment">/* account for the disp32 */</span>;
+
+ <span class="comment">// Patch the relocation with the disp32.
+ </span><span class="self">self</span>.emit_at(off, <span class="kw-2">&amp;</span>disp32.to_ne_bytes());
+ }
+ }
+ }
+
+ <span class="comment">// -- Encode utilities.
+
+ </span><span class="kw">fn </span>encode_rr&lt;T: Reg&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, op1: T, op2: T)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeRR&lt;T&gt;,
+ {
+ <span class="comment">// MR operand encoding.
+ // op1 -&gt; modrm.rm
+ // op2 -&gt; modrm.reg
+ </span><span class="kw">let </span>modrm = modrm(
+ <span class="number">0b11</span>, <span class="comment">/* mod */
+ </span>op2.idx(), <span class="comment">/* reg */
+ </span>op1.idx(), <span class="comment">/* rm */
+ </span>);
+
+ <span class="kw">let </span>prefix = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRR&lt;T&gt;&gt;::legacy_prefix();
+ <span class="kw">let </span>rex = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRR&lt;T&gt;&gt;::rex(op1, op2);
+
+ <span class="self">self</span>.emit_optional(<span class="kw-2">&amp;</span>[prefix, rex]);
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[opc, modrm]);
+ }
+
+ <span class="kw">fn </span>encode_oi&lt;T: Reg, U: Imm&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, op1: T, op2: U)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeRI&lt;T&gt;,
+ {
+ <span class="kw">let </span>opc = opc + (op1.idx() &amp; <span class="number">0b111</span>);
+ <span class="kw">let </span>prefix = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::legacy_prefix();
+ <span class="kw">let </span>rex = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::rex(op1);
+
+ <span class="self">self</span>.emit_optional(<span class="kw-2">&amp;</span>[prefix, rex]);
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[opc]);
+ <span class="self">self</span>.emit(op2.bytes());
+ }
+
+ <span class="kw">fn </span>encode_ri&lt;T: Reg, U: Imm&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, opc_ext: u8, op1: T, op2: U)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeRI&lt;T&gt;,
+ {
+ <span class="comment">// MI operand encoding.
+ // op1 -&gt; modrm.rm
+ // opc extension -&gt; modrm.reg
+ </span><span class="kw">let </span>modrm = modrm(
+ <span class="number">0b11</span>, <span class="comment">/* mod */
+ </span>opc_ext, <span class="comment">/* reg */
+ </span>op1.idx(), <span class="comment">/* rm */
+ </span>);
+
+ <span class="kw">let </span>prefix = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::legacy_prefix();
+ <span class="kw">let </span>rex = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::rex(op1);
+
+ <span class="self">self</span>.emit_optional(<span class="kw-2">&amp;</span>[prefix, rex]);
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[opc, modrm]);
+ <span class="self">self</span>.emit(op2.bytes());
+ }
+
+ <span class="kw">fn </span>encode_r&lt;T: Reg&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, opc_ext: u8, op1: T)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeRI&lt;T&gt;,
+ {
+ <span class="comment">// M operand encoding.
+ // op1 -&gt; modrm.rm
+ // opc extension -&gt; modrm.reg
+ </span><span class="kw">let </span>modrm = modrm(
+ <span class="number">0b11</span>, <span class="comment">/* mod */
+ </span>opc_ext, <span class="comment">/* reg */
+ </span>op1.idx(), <span class="comment">/* rm */
+ </span>);
+
+ <span class="kw">let </span>prefix = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::legacy_prefix();
+ <span class="kw">let </span>rex = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeRI&lt;T&gt;&gt;::rex(op1);
+
+ <span class="self">self</span>.emit_optional(<span class="kw-2">&amp;</span>[prefix, rex]);
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[opc, modrm]);
+ }
+
+ <span class="kw">fn </span>encode_mr&lt;T: Reg&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, op1: MemOp, op2: T)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeMR&lt;T&gt;,
+ {
+ <span class="comment">// MR operand encoding.
+ // op1 -&gt; modrm.rm
+ // op2 -&gt; modrm.reg
+ </span><span class="kw">let </span>mode = <span class="kw">match </span>op1 {
+ MemOp::Indirect(..) =&gt; {
+ <span class="macro">assert!</span>(!op1.base().need_sib() &amp;&amp; !op1.base().is_pc_rel());
+ <span class="number">0b00
+ </span>}
+ MemOp::IndirectDisp(..) =&gt; {
+ <span class="macro">assert!</span>(!op1.base().need_sib());
+ <span class="number">0b10
+ </span>}
+ };
+
+ <span class="kw">let </span>modrm = modrm(
+ mode, <span class="comment">/* mode */
+ </span>op2.idx(), <span class="comment">/* reg */
+ </span>op1.base().idx(), <span class="comment">/* rm */
+ </span>);
+ <span class="kw">let </span>prefix = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeMR&lt;T&gt;&gt;::legacy_prefix();
+ <span class="kw">let </span>rex = &lt;<span class="self">Self </span><span class="kw">as </span>EncodeMR&lt;T&gt;&gt;::rex(<span class="kw-2">&amp;</span>op1, op2);
+
+ <span class="self">self</span>.emit_optional(<span class="kw-2">&amp;</span>[prefix, rex]);
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[opc, modrm]);
+ <span class="kw">if let </span>MemOp::IndirectDisp(<span class="kw">_</span>, disp) = op1 {
+ <span class="self">self</span>.emit(<span class="kw-2">&amp;</span>disp.to_ne_bytes());
+ }
+ }
+
+ <span class="kw">fn </span>encode_rm&lt;T: Reg&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: u8, op1: T, op2: MemOp)
+ <span class="kw">where
+ </span><span class="self">Self</span>: EncodeMR&lt;T&gt;,
+ {
+ <span class="comment">// RM operand encoding.
+ // op1 -&gt; modrm.reg
+ // op2 -&gt; modrm.rm
+ </span><span class="self">self</span>.encode_mr(opc, op2, op1);
+ }
+
+ <span class="kw">fn </span>encode_jmp_label(<span class="kw-2">&amp;mut </span><span class="self">self</span>, opc: <span class="kw-2">&amp;</span>[u8], op1: <span class="kw-2">&amp;mut </span>Label) {
+ <span class="comment">// Emit the opcode.
+ </span><span class="self">self</span>.emit(opc);
+
+ <span class="comment">// Record relocation offset starting at the first byte of the disp32.
+ </span>op1.record_offset(<span class="self">self</span>.buf.len());
+
+ <span class="comment">// Emit a zeroed disp32, which serves as placeholder for the relocation.
+ </span><span class="self">self</span>.emit(<span class="kw-2">&amp;</span>[<span class="number">0u8</span>; <span class="number">4</span>]);
+
+ <span class="comment">// Resolve any pending relocations for the label.
+ </span><span class="self">self</span>.resolve(op1);
+ }
+}
+
+<span class="comment">// -- Encoder helper.
+
+</span><span class="kw">trait </span>EncodeRR&lt;T: Reg&gt; {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">None
+ </span>}
+
+ <span class="kw">fn </span>rex(op1: T, op2: T) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="kw">if </span>op1.need_rex() || op2.need_rex() {
+ <span class="prelude-val">Some</span>(rex(op1.rexw(), op2.idx(), <span class="number">0</span>, op1.idx()))
+ } <span class="kw">else </span>{
+ <span class="prelude-val">None
+ </span>}
+ }
+}
+
+<span class="kw">impl </span>EncodeRR&lt;Reg8&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeRR&lt;Reg32&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeRR&lt;Reg16&gt; <span class="kw">for </span>Asm {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">Some</span>(<span class="number">0x66</span>)
+ }
+}
+<span class="kw">impl </span>EncodeRR&lt;Reg64&gt; <span class="kw">for </span>Asm {}
+
+<span class="kw">trait </span>EncodeRI&lt;T: Reg&gt; {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">None
+ </span>}
+
+ <span class="kw">fn </span>rex(op1: T) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="kw">if </span>op1.need_rex() {
+ <span class="prelude-val">Some</span>(rex(op1.rexw(), <span class="number">0</span>, <span class="number">0</span>, op1.idx()))
+ } <span class="kw">else </span>{
+ <span class="prelude-val">None
+ </span>}
+ }
+}
+
+<span class="kw">impl </span>EncodeRI&lt;Reg8&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeRI&lt;Reg32&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeRI&lt;Reg16&gt; <span class="kw">for </span>Asm {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">Some</span>(<span class="number">0x66</span>)
+ }
+}
+<span class="kw">impl </span>EncodeRI&lt;Reg64&gt; <span class="kw">for </span>Asm {}
+
+<span class="kw">trait </span>EncodeMR&lt;T: Reg&gt; {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">None
+ </span>}
+
+ <span class="kw">fn </span>rex(op1: <span class="kw-2">&amp;</span>MemOp, op2: T) -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="kw">if </span>op2.need_rex() || (op1.base().is_ext()) {
+ <span class="prelude-val">Some</span>(rex(op2.rexw(), op2.idx(), <span class="number">0</span>, op1.base().idx()))
+ } <span class="kw">else </span>{
+ <span class="prelude-val">None
+ </span>}
+ }
+}
+
+<span class="kw">impl </span>EncodeMR&lt;Reg8&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeMR&lt;Reg16&gt; <span class="kw">for </span>Asm {
+ <span class="kw">fn </span>legacy_prefix() -&gt; <span class="prelude-ty">Option</span>&lt;u8&gt; {
+ <span class="prelude-val">Some</span>(<span class="number">0x66</span>)
+ }
+}
+<span class="kw">impl </span>EncodeMR&lt;Reg32&gt; <span class="kw">for </span>Asm {}
+<span class="kw">impl </span>EncodeMR&lt;Reg64&gt; <span class="kw">for </span>Asm {}
+</code></pre></div>
+</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="juicebox_asm" data-themes="" data-resource-suffix="" data-rustdoc-version="1.67.1 (d5a82bbd2 2023-02-07)" data-search-js="search-444266647c4dba98.js" data-settings-js="settings-bebeae96e00e4617.js" data-settings-css="settings-af96d9e2fc13e081.css" ></div></body></html> \ No newline at end of file