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Definition of registers which are used as input operands for various instructions. /// Trait to interact with register operands. </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Reg { <span class="doccomment">/// Get the raw x64 register code. </span><span class="kw">fn </span>idx(<span class="kw-2">&</span><span class="self">self</span>) -> u8; <span class="doccomment">/// Check if the registers needs the `REX.W` bit. </span><span class="kw">fn </span>rexw(<span class="kw-2">&</span><span class="self">self</span>) -> bool; <span class="doccomment">/// Check if the register is an extended registers. </span><span class="kw">fn </span>is_ext(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.idx() > <span class="number">7 </span>} <span class="doccomment">/// Check if the register requires a `REX` byte. </span><span class="kw">fn </span>need_rex(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.is_ext() || <span class="self">self</span>.rexw() } <span class="doccomment">/// Check if the register requires a `SIB` byte if used as addressing operand. /// /// See [64 bit /// addressing](https://wiki.osdev.org/X86-64_Instruction_Encoding#32.2F64-bit_addressing) for /// further details. </span><span class="kw">fn </span>need_sib(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.idx() == <span class="number">4 </span>|| <span class="self">self</span>.idx() == <span class="number">12 </span>} <span class="doccomment">/// Check if the register is interpreted as `PC` relative if used as addressing operand. /// /// See [64 bit /// addressing](https://wiki.osdev.org/X86-64_Instruction_Encoding#32.2F64-bit_addressing) for /// further details. </span><span class="kw">fn </span>is_pc_rel(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.idx() == <span class="number">5 </span>|| <span class="self">self</span>.idx() == <span class="number">13 </span>} } <span class="macro">macro_rules! </span>enum_reg { (<span class="attr">#[<span class="macro-nonterminal">$doc</span>:meta] </span><span class="macro-nonterminal">$name</span>:ident, { $(<span class="macro-nonterminal">$reg</span>:ident),+ $(,)<span class="question-mark">? </span>}) => { <span class="attr">#[<span class="macro-nonterminal">$doc</span>] #[allow(non_camel_case_types)] #[derive(Copy, Clone)] #[repr(u8)] </span><span class="kw">pub enum </span><span class="macro-nonterminal">$name </span>{ $( <span class="macro-nonterminal">$reg</span>, )+ } <span class="attr">#[cfg(test)] </span><span class="kw">impl </span><span class="macro-nonterminal">$name </span>{ <span class="kw">fn </span>iter() -> <span class="kw">impl </span>Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'static </span><span class="macro-nonterminal">$name</span>> { <span class="kw">use </span><span class="macro-nonterminal">$name</span>::<span class="kw-2">*</span>; [$( <span class="macro-nonterminal">$reg</span>, )+].iter() } } }; } <span class="macro">macro_rules! </span>impl_reg { (<span class="attr">#[<span class="macro-nonterminal">$doc</span>:meta] </span><span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$rexw</span>:expr, { $(<span class="macro-nonterminal">$reg</span>:ident),+ $(,)<span class="question-mark">? </span>}) => { <span class="macro">enum_reg!</span>(<span class="attr">#[<span class="macro-nonterminal">$doc</span>] </span><span class="macro-nonterminal">$name</span>, { $( <span class="macro-nonterminal">$reg</span>, )+ }); <span class="kw">impl </span>Reg <span class="kw">for </span><span class="macro-nonterminal">$name </span>{ <span class="doccomment">/// Get the raw x64 register code. </span><span class="kw">fn </span>idx(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { <span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8 } <span class="doccomment">/// Check if the registers needs the `REX.W` bit. </span><span class="kw">fn </span>rexw(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="macro-nonterminal">$rexw </span>} } } } <span class="macro">impl_reg!</span>( <span class="doccomment">/// Definition of 64 bit registers. </span>Reg64, <span class="bool-val">true</span>, { rax, rcx, rdx, rbx, rsp, rbp, rsi, rdi, r8, r9, r10, r11, r12, r13, r14, r15 }); <span class="macro">impl_reg!</span>( <span class="doccomment">/// Definition of 32 bit registers. </span>Reg32, <span class="bool-val">false</span>, { eax, ecx, edx, ebx, esp, ebp, esi, edi, r8d, r9d, r10d, r11d, r12d, r13d, r14d, r15d }); <span class="macro">impl_reg!</span>( <span class="doccomment">/// Definition of 16 bit registers. </span>Reg16, <span class="bool-val">false</span>, { ax, cx, dx, bx, sp, bp, si, di, r8w, r9w, r10w, r11w, r12w, r13w, r14w, r15w }); <span class="macro">enum_reg!</span>( <span class="doccomment">/// Definition of 8 bit registers. </span>Reg8, { al, cl, dl, bl, spl, bpl, sil, dil, r8l, r9l, r10l, r11l, r12l, r13l, r14l, r15l, ah, ch, dh, bh }); <span class="kw">impl </span>Reg <span class="kw">for </span>Reg8 { <span class="doccomment">/// Get the raw x64 register code. </span><span class="kw">fn </span>idx(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { <span class="kw">match </span><span class="self">self </span>{ Reg8::ah => <span class="number">4</span>, Reg8::ch => <span class="number">5</span>, Reg8::dh => <span class="number">6</span>, Reg8::bh => <span class="number">7</span>, <span class="kw">_ </span>=> <span class="kw-2">*</span><span class="self">self </span><span class="kw">as </span>u8, } } <span class="doccomment">/// Check if the registers needs the `REX.W` bit. </span><span class="kw">fn </span>rexw(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="bool-val">false </span>} <span class="doccomment">/// Check whether the gp register needs a `REX` prefix /// Check if the register requires a `REX` byte. /// /// For 1 byte addressing, register indexes `[4:7]` require a `REX` prefix, or else they will /// be decoded as `{AH, CH, DH, BH}` accordingly. /// /// See [Registers](https://wiki.osdev.org/X86-64_Instruction_Encoding#Registers) for /// further details or conduct `Table 3-1. Register Codes` in the *Intel Software Developers /// Manual - Volume 2*. </span><span class="kw">fn </span>need_rex(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.idx() > <span class="number">7 </span>|| <span class="macro">matches!</span>(<span class="self">self</span>, Reg8::spl | Reg8::bpl | Reg8::sil | Reg8::dil) } } <span class="attr">#[cfg(test)] </span><span class="kw">mod </span>tests { <span class="kw">use super</span>::<span class="kw-2">*</span>; <span class="attr">#[test] </span><span class="kw">fn </span>test_reg8() { <span class="kw">use </span>Reg8::<span class="kw-2">*</span>; <span class="kw">for </span>r <span class="kw">in </span>Reg8::iter() { <span class="comment">// Check register index. </span><span class="kw">let </span>idx = <span class="kw">match </span>r { al => <span class="number">0</span>, cl => <span class="number">1</span>, dl => <span class="number">2</span>, bl => <span class="number">3</span>, spl => <span class="number">4</span>, bpl => <span class="number">5</span>, sil => <span class="number">6</span>, dil => <span class="number">7</span>, r8l => <span class="number">8</span>, r9l => <span class="number">9</span>, r10l => <span class="number">10</span>, r11l => <span class="number">11</span>, r12l => <span class="number">12</span>, r13l => <span class="number">13</span>, r14l => <span class="number">14</span>, r15l => <span class="number">15</span>, ah => <span class="number">4</span>, ch => <span class="number">5</span>, dh => <span class="number">6</span>, bh => <span class="number">7</span>, }; <span class="macro">assert_eq!</span>(r.idx(), idx); <span class="comment">// Check REX.W bit. </span><span class="macro">assert!</span>(!r.rexw()); <span class="comment">// Check need REX byte. </span><span class="kw">let </span>rex = <span class="macro">matches!</span>( r, r8l | r9l | r10l | r11l | r12l | r13l | r14l | r15l | spl | bpl | sil | dil ); <span class="macro">assert_eq!</span>(r.need_rex(), rex); <span class="comment">// Check need SIB byte. </span><span class="kw">let </span>sib = <span class="macro">matches!</span>(r, spl | r12l | ah); <span class="macro">assert_eq!</span>(r.need_sib(), sib); <span class="comment">// Check if is PC relative addressing. </span><span class="kw">let </span>rel = <span class="macro">matches!</span>(r, bpl | r13l | ch); <span class="macro">assert_eq!</span>(r.is_pc_rel(), rel); } } <span class="attr">#[test] </span><span class="kw">fn </span>test_reg16() { <span class="kw">use </span>Reg16::<span class="kw-2">*</span>; <span class="kw">for </span>r <span class="kw">in </span>Reg16::iter() { <span class="comment">// Check register index. </span><span class="kw">let </span>idx = <span class="kw">match </span>r { ax => <span class="number">0</span>, cx => <span class="number">1</span>, dx => <span class="number">2</span>, bx => <span class="number">3</span>, sp => <span class="number">4</span>, bp => <span class="number">5</span>, si => <span class="number">6</span>, di => <span class="number">7</span>, r8w => <span class="number">8</span>, r9w => <span class="number">9</span>, r10w => <span class="number">10</span>, r11w => <span class="number">11</span>, r12w => <span class="number">12</span>, r13w => <span class="number">13</span>, r14w => <span class="number">14</span>, r15w => <span class="number">15</span>, }; <span class="macro">assert_eq!</span>(r.idx(), idx); <span class="comment">// Check REX.W bit. </span><span class="macro">assert!</span>(!r.rexw()); <span class="comment">// Check need REX byte. </span><span class="kw">let </span>rex = <span class="macro">matches!</span>(r, r8w | r9w | r10w | r11w | r12w | r13w | r14w | r15w); <span class="macro">assert_eq!</span>(r.need_rex(), rex); <span class="comment">// Check need SIB byte. </span><span class="kw">let </span>sib = <span class="macro">matches!</span>(r, sp | r12w); <span class="macro">assert_eq!</span>(r.need_sib(), sib); <span class="comment">// Check if is PC relative addressing. </span><span class="kw">let </span>rel = <span class="macro">matches!</span>(r, bp | r13w); <span class="macro">assert_eq!</span>(r.is_pc_rel(), rel); } } <span class="attr">#[test] </span><span class="kw">fn </span>test_reg32() { <span class="kw">use </span>Reg32::<span class="kw-2">*</span>; <span class="kw">for </span>r <span class="kw">in </span>Reg32::iter() { <span class="comment">// Check register index. </span><span class="kw">let </span>idx = <span class="kw">match </span>r { eax => <span class="number">0</span>, ecx => <span class="number">1</span>, edx => <span class="number">2</span>, ebx => <span class="number">3</span>, esp => <span class="number">4</span>, ebp => <span class="number">5</span>, esi => <span class="number">6</span>, edi => <span class="number">7</span>, r8d => <span class="number">8</span>, r9d => <span class="number">9</span>, r10d => <span class="number">10</span>, r11d => <span class="number">11</span>, r12d => <span class="number">12</span>, r13d => <span class="number">13</span>, r14d => <span class="number">14</span>, r15d => <span class="number">15</span>, }; <span class="macro">assert_eq!</span>(r.idx(), idx); <span class="comment">// Check REX.W bit. </span><span class="macro">assert!</span>(!r.rexw()); <span class="comment">// Check need REX byte. </span><span class="kw">let </span>rex = <span class="macro">matches!</span>(r, r8d | r9d | r10d | r11d | r12d | r13d | r14d | r15d); <span class="macro">assert_eq!</span>(r.need_rex(), rex); <span class="comment">// Check need SIB byte. </span><span class="kw">let </span>sib = <span class="macro">matches!</span>(r, esp | r12d); <span class="macro">assert_eq!</span>(r.need_sib(), sib); <span class="comment">// Check if is PC relative addressing. </span><span class="kw">let </span>rel = <span class="macro">matches!</span>(r, ebp | r13d); <span class="macro">assert_eq!</span>(r.is_pc_rel(), rel); } } <span class="attr">#[test] </span><span class="kw">fn </span>test_reg64() { <span class="kw">use </span>Reg64::<span class="kw-2">*</span>; <span class="kw">for </span>r <span class="kw">in </span>Reg64::iter() { <span class="comment">// Check register index. </span><span class="kw">let </span>idx = <span class="kw">match </span>r { rax => <span class="number">0</span>, rcx => <span class="number">1</span>, rdx => <span class="number">2</span>, rbx => <span class="number">3</span>, rsp => <span class="number">4</span>, rbp => <span class="number">5</span>, rsi => <span class="number">6</span>, rdi => <span class="number">7</span>, r8 => <span class="number">8</span>, r9 => <span class="number">9</span>, r10 => <span class="number">10</span>, r11 => <span class="number">11</span>, r12 => <span class="number">12</span>, r13 => <span class="number">13</span>, r14 => <span class="number">14</span>, r15 => <span class="number">15</span>, }; <span class="macro">assert_eq!</span>(r.idx(), idx); <span class="comment">// Check REX.W bit. </span><span class="macro">assert!</span>(r.rexw()); <span class="comment">// Check need REX byte. </span><span class="macro">assert!</span>(r.need_rex()); <span class="comment">// Check need SIB byte. </span><span class="kw">let </span>sib = <span class="macro">matches!</span>(r, rsp | r12); <span class="macro">assert_eq!</span>(r.need_sib(), sib); <span class="comment">// Check if is PC relative addressing. </span><span class="kw">let </span>rel = <span class="macro">matches!</span>(r, rbp | r13); <span class="macro">assert_eq!</span>(r.is_pc_rel(), rel); } } } </code></pre></div></section></main></body></html>