chore: add macros for ModRM GPR Instruction parsing

src/disasm.rs

@@ -7,7 +7,7 @@ use crate::{
     Args,
     instructions::{ImmediateByte, ImmediateWord, Instruction, Mnemonic, Register},
 };
-use crate::{modrmb, modrms, modrmv};
+use crate::{modrmb, modrmgprb, modrmgprv, modrms, modrmv};
 
 #[derive(Debug)]
 /// Generic errors, which are encountered during parsing.
@@ -385,18 +385,9 @@ impl Disassembler {
                 0x7E => Mnemonic::JLE(ImmediateByte(self.parse_byte())),
                 0x7F => Mnemonic::JG(ImmediateByte(self.parse_byte())),
 
-                // 0x80..=0x83 => panic!("GRP1 not implemented"),
+                0x80 => modrmgprb!(self),
-                0x80 => {
+                0x81 => modrmgprv!(self),
-                    let (target, reg) = self.parse_modrm_byte(OperandWidth::Byte(0));
+                0x82 => modrmgprb!(self), // same as 0x80
-                    let imm = self.parse_byte();
-                    Self::modrm_reg_to_mnemonic(reg, target, OperandWidth::Byte(imm))
-                }
-                0x81 => {
-                    let (target, reg) = self.parse_modrm_byte(OperandWidth::Word(0));
-                    let imm = self.parse_word();
-                    Self::modrm_reg_to_mnemonic(reg, target, OperandWidth::Word(imm))
-                }
-                0x82 => panic!("Same as 0x80"),
                 0x83 => panic!("Sign extented GPR1 not yet implemented"),
 
                 0x84 => modrmb!(self, TEST),

src/disasm_macros.rs

@@ -24,3 +24,23 @@ macro_rules! modrms {
         Mnemonic::$variant(target, SegmentRegister::by_id(reg))
     }};
 }
+
+#[macro_export]
+/// Generate a GPR instruction from modrm byte for byte
+macro_rules! modrmgprb {
+    ($self:ident) => {{
+        let (target, reg) = $self.parse_modrm_byte(OperandWidth::Byte(0));
+        let imm = $self.parse_byte();
+        Self::modrm_reg_to_mnemonic(reg, target, OperandWidth::Byte(imm))
+    }};
+}
+
+#[macro_export]
+/// Generate a GPR instruction from modrm byte for word
+macro_rules! modrmgprv {
+    ($self:ident) => {{
+        let (target, reg) = $self.parse_modrm_byte(OperandWidth::Word(0));
+        let imm = $self.parse_byte();
+        Self::modrm_reg_to_mnemonic(reg, target, OperandWidth::Word(imm.into()))
+    }};
+}