ft: partially implement Group 5 instructions

2025-05-14 13:41:08 +09:00
parent 4fa789e6bb
commit 1f88db75f5
2 changed files with 17 additions and 1 deletions
--- a/src/disasm.rs
+++ b/src/disasm.rs
@@ -613,7 +613,20 @@ impl Disassembler {
                        _ => panic!("Illegal Group 4 mnemonic"),
                    }
                }
-                0xFF => todo!("Group 5"),
+                0xFF => {
+                    let (target, reg) = self.parse_modrm_byte(Operand::Word(0));
+                    match reg {
+                        0b000 => Mnemonic::INC_Mod(target),
+                        0b001 => Mnemonic::DEC_Mod(target),
+                        0b010 => Mnemonic::CALL_Mod(target),
+                        0b011 => todo!("Implement CALL Mp"),
+                        0b100 => Mnemonic::JMP_Mod(target),
+                        0b101 => todo!("Implement JMP Mp"),
+                        0b110 => Mnemonic::PUSH_Mod(target),
+                        // 0b111 => unused
+                        _ => panic!("Illegal Group 5 mnemonic"),
+                    }
+                }

                _ => {
                    eprintln!("Encountered unknown instruction '0x{:x}'", opcode);