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, 58 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Tamper/CodeEmitters/LoadRegisterWithMemory.cs b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/LoadRegisterWithMemory.cs
new file mode 100644
index 00000000..87b37a1e
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/LoadRegisterWithMemory.cs
@@ -0,0 +1,58 @@
+using Ryujinx.HLE.Exceptions;
+
+namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
+{
+    /// <summary>
+    /// Code type 5 allows loading a value from memory into a register, either using a fixed address or by
+    /// dereferencing the destination register.
+    /// </summary>
+    class LoadRegisterWithMemory
+    {
+        private const int OperationWidthIndex = 1;
+        private const int MemoryRegionIndex = 2;
+        private const int DestinationRegisterIndex = 3;
+        private const int UseDestinationAsSourceIndex = 4;
+        private const int OffsetImmediateIndex = 6;
+
+        private const int OffsetImmediateSize = 10;
+
+        public static void Emit(byte[] instruction, CompilationContext context)
+        {
+            // 5TMR00AA AAAAAAAA
+            // T: Width of memory read (1, 2, 4, or 8 bytes).
+            // M: Memory region to write to (0 = Main NSO, 1 = Heap).
+            // R: Register to load value into.
+            // A: Immediate offset to use from memory region base.
+
+            // 5TMR10AA AAAAAAAA
+            // T: Width of memory read(1, 2, 4, or 8 bytes).
+            // M: Ignored.
+            // R: Register to use as base address and to load value into.
+            // A: Immediate offset to use from register R.
+
+            byte operationWidth = instruction[OperationWidthIndex];
+            MemoryRegion memoryRegion = (MemoryRegion)instruction[MemoryRegionIndex];
+            Register destinationRegister = context.GetRegister(instruction[DestinationRegisterIndex]);
+            byte useDestinationAsSourceIndex = instruction[UseDestinationAsSourceIndex];
+            ulong address = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
+
+            Pointer sourceMemory;
+
+            switch (useDestinationAsSourceIndex)
+            {
+                case 0:
+                    // Don't use the source register as an additional address offset.
+                    sourceMemory = MemoryHelper.EmitPointer(memoryRegion, address, context);
+                    break;
+                case 1:
+                    // Use the source register as the base address.
+                    sourceMemory = MemoryHelper.EmitPointer(destinationRegister, address, context);
+                    break;
+                default:
+                    throw new TamperCompilationException($"Invalid source mode {useDestinationAsSourceIndex} in Atmosphere cheat");
+            }
+
+            InstructionHelper.EmitMov(operationWidth, context, destinationRegister, sourceMemory);
+        }
+    }
+}