sp word alignment on real hardware

Author: coder114514

emulator/src/Chipset/CPU.cpp

@@ -244,6 +244,7 @@ namespace casioemu {
         SetupOpcodeDispatch();
         SetupRegisterProxies();
         impl_csr_mask = emulator.GetModelInfo("csr_mask");
+        real_hardware = emulator.GetModelInfo("real_hardware");
     }
 
     void CPU::SetupOpcodeDispatch() {

emulator/src/Chipset/CPU.hpp

@@ -65,6 +65,8 @@ namespace casioemu {
         size_t impl_hint;
         uint16_t impl_csr_mask;
 
+        bool real_hardware;
+
         void SetupOpcodeDispatch();
         void SetupRegisterProxies();
 

emulator/src/Chipset/CPUControl.cpp

@@ -10,6 +10,7 @@ namespace casioemu {
     void CPU::OP_ADDSP() {
         impl_operands[0].value |= (impl_operands[0].value & 0x80) ? 0xFF00 : 0;
         reg_sp += impl_operands[0].value;
+        if (real_hardware) reg_sp &= ~1;
     }
 
     void CPU::OP_CTRL() {
@@ -46,6 +47,7 @@ namespace casioemu {
             break;
         case 11:
             reg_sp = impl_operands[1].value;
+            if (real_hardware) reg_sp &= ~1;
             break;
         }
     }