Add the TamperMachine module for runtime mods and cheats (#1928)

* Add initial implementation of the Tamper Machine

* Implement Atmosphere opcodes 0, 4 and 9

* Add missing TamperCompilationException class

* Implement Atmosphere conditional and loop opcodes 1, 2 and 3

* Inplement input conditional opcode 8

* Add register store opcode A

* Implement extended pause/resume opcodes FF0 and FF1

* Implement extended log opcode FFF

* Implement extended register conditional opcode C0

* Refactor TamperProgram to an interface

* Moved Atmosphere classes to a separate subdirectory

* Fix OpProcCtrl class not setting process

* Implement extended register save/restore opcodes C1, C2 and C3

* Refactor code emitters to separate classes

* Supress memory access errors from the Tamper Machine

* Add debug information to tamper register and memory writes

* Add block stack check to Atmosphere Cheat compiler

* Add handheld input support to Tamper Machine

* Fix code styling

* Fix build id and cheat case mismatch

* Fix invalid immediate size selection

* Print build ids of the title

* Prevent Tamper Machine from change code regions

* Remove Atmosphere namespace

* Remove empty cheats from the list

* Prevent code modification without disabling the tampering

* Fix missing addressing mode in LoadRegisterWithMemory

* Fix wrong addressing in RegisterConditional

* Add name to the tamper machine thread

* Fix code styling

1 files changed, 47 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/ReadOrWriteStaticRegister.cs
new file mode 100644
index 00000000..67775df7
--- /dev/null
+++ b/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));
+        }
+    }
+}