From cee712105850ac3385cd0091a923438167433f9f Mon Sep 17 00:00:00 2001
From: TSR Berry <20988865+TSRBerry@users.noreply.github.com>
Date: Sat, 8 Apr 2023 01:22:00 +0200
Subject: Move solution and projects to src

---
 .../CodeEmitters/ReadOrWriteStaticRegister.cs      | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs

(limited to 'src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs')

diff --git a/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs b/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs
new file mode 100644
index 00000000..67775df7
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs
@@ -0,0 +1,47 @@
+using Ryujinx.HLE.HOS.Tamper.Operations;
+
+namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
+{
+    /// <summary>
+    /// Code type 0xC3 reads or writes a static register with a given register.
+    /// NOTE: Registers are saved and restored to a different set of registers than the ones used
+    /// for the other opcodes (Static Registers).
+    /// </summary>
+    class ReadOrWriteStaticRegister
+    {
+        private const int StaticRegisterIndex = 5;
+        private const int RegisterIndex = 7;
+
+        private const byte FirstWriteRegister = 0x80;
+
+        private const int StaticRegisterSize = 2;
+
+        public static void Emit(byte[] instruction, CompilationContext context)
+        {
+            // C3000XXx
+            // XX: Static register index, 0x00 to 0x7F for reading or 0x80 to 0xFF for writing.
+            // x: Register index.
+
+            ulong staticRegisterIndex = InstructionHelper.GetImmediate(instruction, StaticRegisterIndex, StaticRegisterSize);
+            Register register = context.GetRegister(instruction[RegisterIndex]);
+
+            IOperand sourceRegister;
+            IOperand destinationRegister;
+
+            if (staticRegisterIndex < FirstWriteRegister)
+            {
+                // Read from static register.
+                sourceRegister = context.GetStaticRegister((byte)staticRegisterIndex);
+                destinationRegister = register;
+            }
+            else
+            {
+                // Write to static register.
+                sourceRegister = register;
+                destinationRegister = context.GetStaticRegister((byte)(staticRegisterIndex - FirstWriteRegister));
+            }
+
+            context.CurrentOperations.Add(new OpMov<ulong>(destinationRegister, sourceRegister));
+        }
+    }
+}
-- 
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