1 files changed, 63 insertions, 0 deletions
diff --git a/src/Arithmetic.cpp b/src/Arithmetic.cpp
new file mode 100644
index 0000000..dd2a1ef
--- /dev/null
+++ b/src/Arithmetic.cpp
@@ -0,0 +1,63 @@
+#include "Arithmetic.h"
+
+#include "ExecutorCases.h"
+#include "CPUContext.h"
+#include "Instruction.h"
+#include "Bus.h"
+
+#include <stdexcept>
+#include <iostream>
+
+namespace executor_cases {
+  void Add_rm32_r32(CPUContext& cc){
+    x86::ModRM modrm = cc.m_Instruction.m_ModRM;
+
+    std::cout << "[Instruction] ";
+
+    switch(modrm.m_State) {
+    case x86::ModRMState::R:
+      cc.m_Registers[modrm.m_Rm] += cc.m_Registers[modrm.m_Reg];
+      std::cout << "add " << x86::Register2Str((x86::Register)modrm.m_Rm) << ", " <<  x86::Register2Str((x86::Register)modrm.m_Rm);
+      break;
+    default:
+      helpers::Add_rm_dst(cc, helpers::ResolveModRMAddress(cc));
+      std::cout << "add DWORD PTR [0x" << helpers::ResolveModRMAddress(cc) << "], " <<  x86::Register2Str((x86::Register)modrm.m_Reg);
+      break;
+    }
+
+    std::cout << std::endl;
+  }
+
+  // TODO: Finish the function
+  void Add_r32_rm32(CPUContext& cc){
+    // x86::ModRM modrm = cc.m_Instruction.optional.m_ModRM;
+    
+    // std::cout << "[Instruction] ";
+    
+    // switch(modrm.m_State) {
+    // case x86::ModRMState::R:
+    //   cc.m_Registers[modrm.m_Reg] += cc.m_Registers[modrm.m_Rm];
+    //   std::cout << "add " << x86::Register2Str((x86::Register)modrm.m_Reg) << ", " <<  x86::Register2Str((x86::Register)modrm.m_Rm);
+    //   break;
+    // default:
+    //   uint32_t dstAddress = ;ResolveModRMAddress(cc);
+    //   uint32_t dstPrevValue = cc.m_Bus->AccessX<uint32_t>(dstAddress);
+    //   uint32_t currRegValue = cc.m_Registers[cc.m_Instruction.optional.m_ModRM.m_Reg];
+    //   uint32_t result = dstPrevValue + currRegValue;
+    //   std::cout << "add DWORD PTR [0x" << helpers::ResolveModRMAddress(cc) << "], " <<  x86::Register2Str((x86::Register)modrm.m_Reg);
+    //   break;
+    // }
+
+    // std::cout << std::endl;
+    std::runtime_error("Not implemented!");
+ }
+
+  namespace helpers {
+    void Add_rm_dst(CPUContext& cc, uint32_t address) {
+      uint32_t dstPrevValue = cc.m_Bus->AccessX<uint32_t>(address);
+      uint32_t currRegValue = cc.m_Registers[cc.m_Instruction.m_ModRM.m_Reg];
+      uint32_t result = dstPrevValue + currRegValue;
+      cc.m_Bus->WriteX<uint32_t>(address, result);
+    }
+  }
+}