1 files changed, 45 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/MemoryConditional.cs b/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/MemoryConditional.cs
new file mode 100644
index 00000000..2048a67b
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Tamper/CodeEmitters/MemoryConditional.cs
@@ -0,0 +1,45 @@
+using Ryujinx.HLE.HOS.Tamper.Conditions;
+
+namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
+{
+    /// <summary>
+    /// Code type 1 performs a comparison of the contents of memory to a static value.
+    /// If the condition is not met, all instructions until the appropriate conditional block terminator
+    /// are skipped.
+    /// </summary>
+    class MemoryConditional
+    {
+        private const int OperationWidthIndex = 1;
+        private const int MemoryRegionIndex = 2;
+        private const int ComparisonTypeIndex = 3;
+        private const int OffsetImmediateIndex = 6;
+        private const int ValueImmediateIndex = 16;
+
+        private const int OffsetImmediateSize = 10;
+        private const int ValueImmediateSize4 = 8;
+        private const int ValueImmediateSize8 = 16;
+
+        public static ICondition Emit(byte[] instruction, CompilationContext context)
+        {
+            // 1TMC00AA AAAAAAAA VVVVVVVV (VVVVVVVV)
+            // T: Width of memory write (1, 2, 4, or 8 bytes).
+            // M: Memory region to write to (0 = Main NSO, 1 = Heap).
+            // C: Condition to use, see below.
+            // A: Immediate offset to use from memory region base.
+            // V: Value to compare to.
+
+            byte operationWidth = instruction[OperationWidthIndex];
+            MemoryRegion memoryRegion = (MemoryRegion)instruction[MemoryRegionIndex];
+            Comparison comparison = (Comparison)instruction[ComparisonTypeIndex];
+
+            ulong address = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
+            Pointer sourceMemory = MemoryHelper.EmitPointer(memoryRegion, address, context);
+
+            int valueSize = operationWidth <= 4 ? ValueImmediateSize4 : ValueImmediateSize8;
+            ulong value = InstructionHelper.GetImmediate(instruction, ValueImmediateIndex, valueSize);
+            Value<ulong> compareToValue = new Value<ulong>(value);
+
+            return InstructionHelper.CreateCondition(comparison, operationWidth, sourceMemory, compareToValue);
+        }
+    }
+}