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author | johannst <johannst@users.noreply.github.com> | 2023-02-27 22:52:40 +0000 |
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committer | johannst <johannst@users.noreply.github.com> | 2023-02-27 22:52:40 +0000 |
commit | 872cf6d06f4d77637b4627fdc583bab79ee2372f (patch) | |
tree | 07022610d914be3813d283577a71a18f26b81d64 /src/juicebox_asm/lib.rs.html | |
download | juicebox-asm-872cf6d06f4d77637b4627fdc583bab79ee2372f.tar.gz juicebox-asm-872cf6d06f4d77637b4627fdc583bab79ee2372f.zip |
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1 files changed, 610 insertions, 0 deletions
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class="kw-2">&</span><span class="self">self</span>) -> Reg64 { + <span class="kw">match </span><span class="self">self </span>{ + MemOp::Indirect(base) => <span class="kw-2">*</span>base, + MemOp::IndirectDisp(base, ..) => <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) -> 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 >> <span class="number">3</span>) & <span class="number">1</span>; + <span class="kw">let </span>x = (x >> <span class="number">3</span>) & <span class="number">1</span>; + <span class="kw">let </span>b = (b >> <span class="number">3</span>) & <span class="number">1</span>; + <span class="number">0b0100_0000 </span>| ((w & <span class="number">1</span>) << <span class="number">3</span>) | (r << <span class="number">2</span>) | (x << <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) -> u8 { + ((mod_ & <span class="number">0b11</span>) << <span class="number">6</span>) | ((reg & <span class="number">0b111</span>) << <span class="number">3</span>) | (rm & <span class="number">0b111</span>) +} + +<span class="kw">pub struct </span>Asm { + buf: Vec<u8>, +} + +<span class="kw">impl </span>Asm { + <span class="kw">pub fn </span>new() -> 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>) -> Vec<u8> { + <span class="self">self</span>.buf + } + + <span class="kw">fn </span>emit(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[u8]) { + <span class="self">self</span>.buf.extend_from_slice(bytes); + } + + <span class="kw">fn </span>emit_optional(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>[<span class="prelude-ty">Option</span><u8>]) { + <span class="kw">for </span>byte <span class="kw">in </span>bytes.iter().filter_map(|<span class="kw-2">&</span>b| b) { + <span class="self">self</span>.buf.push(byte); + } + } + + <span class="kw">fn </span>emit_at(<span class="kw-2">&mut </span><span class="self">self</span>, pos: usize, bytes: <span class="kw-2">&</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">&mut </span><span class="self">self</span>, label: <span class="kw-2">&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">&mut </span><span class="self">self</span>, label: <span class="kw-2">&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">"Label location did not fit into i32."</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">"Label offset did not fit into i32"</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">&</span>disp32.to_ne_bytes()); + } + } + } + + <span class="comment">// -- Encode utilities. + + </span><span class="kw">fn </span>encode_rr<T: Reg>(<span class="kw-2">&mut </span><span class="self">self</span>, opc: u8, op1: T, op2: T) + <span class="kw">where + </span><span class="self">Self</span>: EncodeRR<T>, + { + <span class="comment">// MR operand encoding. + // op1 -> modrm.rm + // op2 -> 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 = <<span class="self">Self </span><span class="kw">as </span>EncodeRR<T>>::legacy_prefix(); + <span class="kw">let </span>rex = <<span class="self">Self </span><span class="kw">as </span>EncodeRR<T>>::rex(op1, op2); + + <span class="self">self</span>.emit_optional(<span class="kw-2">&</span>[prefix, rex]); + <span class="self">self</span>.emit(<span class="kw-2">&</span>[opc, modrm]); + } + + <span class="kw">fn </span>encode_oi<T: Reg, U: Imm>(<span class="kw-2">&mut </span><span class="self">self</span>, opc: u8, op1: T, op2: U) + <span class="kw">where + </span><span class="self">Self</span>: EncodeRI<T>, + { + <span class="kw">let </span>opc = opc + (op1.idx() & <span class="number">0b111</span>); + <span class="kw">let </span>prefix = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::legacy_prefix(); + <span class="kw">let </span>rex = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::rex(op1); + + <span class="self">self</span>.emit_optional(<span class="kw-2">&</span>[prefix, rex]); + <span class="self">self</span>.emit(<span class="kw-2">&</span>[opc]); + <span class="self">self</span>.emit(op2.bytes()); + } + + <span class="kw">fn </span>encode_ri<T: Reg, U: Imm>(<span class="kw-2">&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<T>, + { + <span class="comment">// MI operand encoding. + // op1 -> modrm.rm + // opc extension -> 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 = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::legacy_prefix(); + <span class="kw">let </span>rex = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::rex(op1); + + <span class="self">self</span>.emit_optional(<span class="kw-2">&</span>[prefix, rex]); + <span class="self">self</span>.emit(<span class="kw-2">&</span>[opc, modrm]); + <span class="self">self</span>.emit(op2.bytes()); + } + + <span class="kw">fn </span>encode_r<T: Reg>(<span class="kw-2">&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<T>, + { + <span class="comment">// M operand encoding. + // op1 -> modrm.rm + // opc extension -> 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 = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::legacy_prefix(); + <span class="kw">let </span>rex = <<span class="self">Self </span><span class="kw">as </span>EncodeRI<T>>::rex(op1); + + <span class="self">self</span>.emit_optional(<span class="kw-2">&</span>[prefix, rex]); + <span class="self">self</span>.emit(<span class="kw-2">&</span>[opc, modrm]); + } + + <span class="kw">fn </span>encode_mr<T: Reg>(<span class="kw-2">&mut </span><span class="self">self</span>, opc: u8, op1: MemOp, op2: T) + <span class="kw">where + </span><span class="self">Self</span>: EncodeMR<T>, + { + <span class="comment">// MR operand encoding. + // op1 -> modrm.rm + // op2 -> modrm.reg + </span><span class="kw">let </span>mode = <span class="kw">match </span>op1 { + MemOp::Indirect(..) => { + <span class="macro">assert!</span>(!op1.base().need_sib() && !op1.base().is_pc_rel()); + <span class="number">0b00 + </span>} + MemOp::IndirectDisp(..) => { + <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 = <<span class="self">Self </span><span class="kw">as </span>EncodeMR<T>>::legacy_prefix(); + <span class="kw">let </span>rex = <<span class="self">Self </span><span class="kw">as </span>EncodeMR<T>>::rex(<span class="kw-2">&</span>op1, op2); + + <span class="self">self</span>.emit_optional(<span class="kw-2">&</span>[prefix, rex]); + <span class="self">self</span>.emit(<span class="kw-2">&</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">&</span>disp.to_ne_bytes()); + } + } + + <span class="kw">fn </span>encode_rm<T: Reg>(<span class="kw-2">&mut </span><span class="self">self</span>, opc: u8, op1: T, op2: MemOp) + <span class="kw">where + </span><span class="self">Self</span>: EncodeMR<T>, + { + <span class="comment">// RM operand encoding. + // op1 -> modrm.reg + // op2 -> 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">&mut </span><span class="self">self</span>, opc: <span class="kw-2">&</span>[u8], op1: <span class="kw-2">&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">&</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<T: Reg> { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">None + </span>} + + <span class="kw">fn </span>rex(op1: T, op2: T) -> <span class="prelude-ty">Option</span><u8> { + <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<Reg8> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeRR<Reg32> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeRR<Reg16> <span class="kw">for </span>Asm { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">Some</span>(<span class="number">0x66</span>) + } +} +<span class="kw">impl </span>EncodeRR<Reg64> <span class="kw">for </span>Asm {} + +<span class="kw">trait </span>EncodeRI<T: Reg> { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">None + </span>} + + <span class="kw">fn </span>rex(op1: T) -> <span class="prelude-ty">Option</span><u8> { + <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<Reg8> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeRI<Reg32> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeRI<Reg16> <span class="kw">for </span>Asm { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">Some</span>(<span class="number">0x66</span>) + } +} +<span class="kw">impl </span>EncodeRI<Reg64> <span class="kw">for </span>Asm {} + +<span class="kw">trait </span>EncodeMR<T: Reg> { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">None + </span>} + + <span class="kw">fn </span>rex(op1: <span class="kw-2">&</span>MemOp, op2: T) -> <span class="prelude-ty">Option</span><u8> { + <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<Reg8> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeMR<Reg16> <span class="kw">for </span>Asm { + <span class="kw">fn </span>legacy_prefix() -> <span class="prelude-ty">Option</span><u8> { + <span class="prelude-val">Some</span>(<span class="number">0x66</span>) + } +} +<span class="kw">impl </span>EncodeMR<Reg32> <span class="kw">for </span>Asm {} +<span class="kw">impl </span>EncodeMR<Reg64> <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>
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