1 files changed, 95 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/HOS/Tamper/MemoryHelper.cs b/src/Ryujinx.HLE/HOS/Tamper/MemoryHelper.cs
new file mode 100644
index 00000000..1260ed9a
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Tamper/MemoryHelper.cs
@@ -0,0 +1,95 @@
+using Ryujinx.HLE.Exceptions;
+using Ryujinx.HLE.HOS.Tamper.Operations;
+
+namespace Ryujinx.HLE.HOS.Tamper
+{
+    class MemoryHelper
+    {
+        public static ulong GetAddressShift(MemoryRegion source, CompilationContext context)
+        {
+            switch (source)
+            {
+                case MemoryRegion.NSO:
+                    // Memory address is relative to the code start.
+                    return context.ExeAddress;
+                case MemoryRegion.Heap:
+                    // Memory address is relative to the heap.
+                    return context.HeapAddress;
+                case MemoryRegion.Alias:
+                    // Memory address is relative to the alias region.
+                    return context.AliasAddress;
+                case MemoryRegion.Asrl:
+                    // Memory address is relative to the asrl region, which matches the code region.
+                    return context.AslrAddress;
+                default:
+                    throw new TamperCompilationException($"Invalid memory source {source} in Atmosphere cheat");
+            }
+        }
+
+        private static void EmitAdd(Value<ulong> finalValue, IOperand firstOperand, IOperand secondOperand, CompilationContext context)
+        {
+            context.CurrentOperations.Add(new OpAdd<ulong>(finalValue, firstOperand, secondOperand));
+        }
+
+        public static Pointer EmitPointer(ulong addressImmediate, CompilationContext context)
+        {
+            Value<ulong> addressImmediateValue = new Value<ulong>(addressImmediate);
+
+            return new Pointer(addressImmediateValue, context.Process);
+        }
+
+        public static Pointer EmitPointer(Register addressRegister, CompilationContext context)
+        {
+            return new Pointer(addressRegister, context.Process);
+        }
+
+        public static Pointer EmitPointer(Register addressRegister, ulong offsetImmediate, CompilationContext context)
+        {
+            Value<ulong> offsetImmediateValue = new Value<ulong>(offsetImmediate);
+            Value<ulong> finalAddressValue = new Value<ulong>(0);
+            EmitAdd(finalAddressValue, addressRegister, offsetImmediateValue, context);
+
+            return new Pointer(finalAddressValue, context.Process);
+        }
+
+        public static Pointer EmitPointer(Register addressRegister, Register offsetRegister, CompilationContext context)
+        {
+            Value<ulong> finalAddressValue = new Value<ulong>(0);
+            EmitAdd(finalAddressValue, addressRegister, offsetRegister, context);
+
+            return new Pointer(finalAddressValue, context.Process);
+        }
+
+        public static Pointer EmitPointer(Register addressRegister, Register offsetRegister, ulong offsetImmediate, CompilationContext context)
+        {
+            Value<ulong> offsetImmediateValue = new Value<ulong>(offsetImmediate);
+            Value<ulong> finalOffsetValue = new Value<ulong>(0);
+            EmitAdd(finalOffsetValue, offsetRegister, offsetImmediateValue, context);
+            Value<ulong> finalAddressValue = new Value<ulong>(0);
+            EmitAdd(finalAddressValue, addressRegister, finalOffsetValue, context);
+
+            return new Pointer(finalAddressValue, context.Process);
+        }
+
+        public static Pointer EmitPointer(MemoryRegion memoryRegion, ulong offsetImmediate, CompilationContext context)
+        {
+            offsetImmediate += GetAddressShift(memoryRegion, context);
+
+            return EmitPointer(offsetImmediate, context);
+        }
+
+        public static Pointer EmitPointer(MemoryRegion memoryRegion, Register offsetRegister, CompilationContext context)
+        {
+            ulong offsetImmediate = GetAddressShift(memoryRegion, context);
+
+            return EmitPointer(offsetRegister, offsetImmediate, context);
+        }
+
+        public static Pointer EmitPointer(MemoryRegion memoryRegion, Register offsetRegister, ulong offsetImmediate, CompilationContext context)
+        {
+            offsetImmediate += GetAddressShift(memoryRegion, context);
+
+            return EmitPointer(offsetRegister, offsetImmediate, context);
+        }
+    }
+}