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, 26 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Tamper/CodeEmitters/KeyPressConditional.cs b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/KeyPressConditional.cs
new file mode 100644
index 00000000..a1758665
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Tamper/CodeEmitters/KeyPressConditional.cs
@@ -0,0 +1,26 @@
+using Ryujinx.HLE.HOS.Tamper.Conditions;
+
+namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
+{
+    /// <summary>
+    /// Code type 8 enters or skips a conditional block based on whether a key combination is pressed.
+    /// </summary>
+    class KeyPressConditional
+    {
+        private const int InputMaskIndex = 1;
+
+        private const int InputMaskSize = 7;
+
+        public static ICondition Emit(byte[] instruction, CompilationContext context)
+        {
+            // 8kkkkkkk
+            // k: Keypad mask to check against, see below.
+            // Note that for multiple button combinations, the bitmasks should be ORd together.
+            // The Keypad Values are the direct output of hidKeysDown().
+
+            ulong inputMask = InstructionHelper.GetImmediate(instruction, InputMaskIndex, InputMaskSize);
+
+            return new InputMask((long)inputMask, context.PressedKeys);
+        }
+    }
+}