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, 106 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Tamper/CodeEmitters/RegisterConditional.cs b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/RegisterConditional.cs
new file mode 100644
index 00000000..fcd3a9eb
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/RegisterConditional.cs
@@ -0,0 +1,106 @@
+using Ryujinx.HLE.Exceptions;
+using Ryujinx.HLE.HOS.Tamper.Conditions;
+using Ryujinx.HLE.HOS.Tamper.Operations;
+
+namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
+{
+    /// <summary>
+    /// Code type 0xC0 performs a comparison of the contents of a register and another value.
+    /// This code support multiple operand types, see below. If the condition is not met,
+    /// all instructions until the appropriate conditional block terminator are skipped.
+    /// </summary>
+    class RegisterConditional
+    {
+        private const int OperationWidthIndex = 2;
+        private const int ComparisonTypeIndex = 3;
+        private const int SourceRegisterIndex = 4;
+        private const int OperandTypeIndex = 5;
+        private const int RegisterOrMemoryRegionIndex = 6;
+        private const int OffsetImmediateIndex = 7;
+        private const int ValueImmediateIndex = 8;
+
+        private const int MemoryRegionWithOffsetImmediate = 0;
+        private const int MemoryRegionWithOffsetRegister = 1;
+        private const int AddressRegisterWithOffsetImmediate = 2;
+        private const int AddressRegisterWithOffsetRegister = 3;
+        private const int OffsetImmediate = 4;
+        private const int AddressRegister = 5;
+
+        private const int OffsetImmediateSize = 9;
+        private const int ValueImmediateSize8 = 8;
+        private const int ValueImmediateSize16 = 16;
+
+        public static ICondition Emit(byte[] instruction, CompilationContext context)
+        {
+            // C0TcSX##
+            // C0TcS0Ma aaaaaaaa
+            // C0TcS1Mr
+            // C0TcS2Ra aaaaaaaa
+            // C0TcS3Rr
+            // C0TcS400 VVVVVVVV (VVVVVVVV)
+            // C0TcS5X0
+            // T: Width of memory write(1, 2, 4, or 8 bytes).
+            // c: Condition to use, see below.
+            // S: Source Register.
+            // X: Operand Type, see below.
+            // M: Memory Type(operand types 0 and 1).
+            // R: Address Register(operand types 2 and 3).
+            // a: Relative Address(operand types 0 and 2).
+            // r: Offset Register(operand types 1 and 3).
+            // X: Other Register(operand type 5).
+            // V: Value to compare to(operand type 4).
+
+            byte operationWidth = instruction[OperationWidthIndex];
+            Comparison comparison = (Comparison)instruction[ComparisonTypeIndex];
+            Register sourceRegister = context.GetRegister(instruction[SourceRegisterIndex]);
+            byte operandType = instruction[OperandTypeIndex];
+            byte registerOrMemoryRegion = instruction[RegisterOrMemoryRegionIndex];
+            byte offsetRegisterIndex = instruction[OffsetImmediateIndex];
+            ulong offsetImmediate;
+            ulong valueImmediate;
+            int valueImmediateSize;
+            Register addressRegister;
+            Register offsetRegister;
+            IOperand sourceOperand;
+
+            switch (operandType)
+            {
+                case MemoryRegionWithOffsetImmediate:
+                    // *(?x + #a)
+                    offsetImmediate = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
+                    sourceOperand = MemoryHelper.EmitPointer((MemoryRegion)registerOrMemoryRegion, offsetImmediate, context);
+                    break;
+                case MemoryRegionWithOffsetRegister:
+                    // *(?x + $r)
+                    offsetRegister = context.GetRegister(offsetRegisterIndex);
+                    sourceOperand = MemoryHelper.EmitPointer((MemoryRegion)registerOrMemoryRegion, offsetRegister, context);
+                    break;
+                case AddressRegisterWithOffsetImmediate:
+                    // *($R + #a)
+                    addressRegister = context.GetRegister(registerOrMemoryRegion);
+                    offsetImmediate = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
+                    sourceOperand = MemoryHelper.EmitPointer(addressRegister, offsetImmediate, context);
+                    break;
+                case AddressRegisterWithOffsetRegister:
+                    // *($R + $r)
+                    addressRegister = context.GetRegister(registerOrMemoryRegion);
+                    offsetRegister = context.GetRegister(offsetRegisterIndex);
+                    sourceOperand = MemoryHelper.EmitPointer(addressRegister, offsetRegister, context);
+                    break;
+                case OffsetImmediate:
+                    valueImmediateSize = operationWidth <= 4 ? ValueImmediateSize8 : ValueImmediateSize16;
+                    valueImmediate = InstructionHelper.GetImmediate(instruction, ValueImmediateIndex, valueImmediateSize);
+                    sourceOperand = new Value<ulong>(valueImmediate);
+                    break;
+                case AddressRegister:
+                    // $V
+                    sourceOperand = context.GetRegister(registerOrMemoryRegion);
+                    break;
+                default:
+                    throw new TamperCompilationException($"Invalid operand type {operandType} in Atmosphere cheat");
+            }
+
+            return InstructionHelper.CreateCondition(comparison, operationWidth, sourceRegister, sourceOperand);
+        }
+    }
+}