Implement a new JIT for Arm devices (#6057)

* Implement a new JIT for Arm devices

* Auto-format

* Make a lot of Assembler members read-only

* More read-only

* Fix more warnings

* ObjectDisposedException.ThrowIf

* New JIT cache for platforms that enforce W^X, currently unused

* Remove unused using

* Fix assert

* Pass memory manager type around

* Safe memory manager mode support + other improvements

* Actual safe memory manager mode masking support

* PR feedback

src/Ryujinx.Cpu/LightningJit/Arm32/RegisterUtils.cs

@@ -0,0 +1,109 @@
+using System;
+
+namespace Ryujinx.Cpu.LightningJit.Arm32
+{
+    static class RegisterUtils
+    {
+        public const int SpRegister = 13;
+        public const int LrRegister = 14;
+        public const int PcRegister = 15;
+
+        private const int RmBit = 0;
+        private const int RdRtBit = 12;
+        private const int RdHiRnBit = 16;
+
+        private const int RdRtT16Bit = 16;
+        private const int RdRtT16AltBit = 24;
+
+        private const int RdRt2RdHiT32Bit = 8;
+        private const int RdT32AltBit = 0;
+        private const int RtRdLoT32Bit = 12;
+
+        public static int ExtractRt(uint encoding)
+        {
+            return (int)(encoding >> RdRtBit) & 0xf;
+        }
+
+        public static int ExtractRt2(uint encoding)
+        {
+            return (int)GetRt2((uint)ExtractRt(encoding));
+        }
+
+        public static int ExtractRd(InstFlags flags, uint encoding)
+        {
+            return flags.HasFlag(InstFlags.Rd16) ? ExtractRn(encoding) : ExtractRd(encoding);
+        }
+
+        public static int ExtractRd(uint encoding)
+        {
+            return (int)(encoding >> RdRtBit) & 0xf;
+        }
+
+        public static int ExtractRdHi(uint encoding)
+        {
+            return (int)(encoding >> RdHiRnBit) & 0xf;
+        }
+
+        public static int ExtractRn(uint encoding)
+        {
+            return (int)(encoding >> RdHiRnBit) & 0xf;
+        }
+
+        public static int ExtractRm(uint encoding)
+        {
+            return (int)(encoding >> RmBit) & 0xf;
+        }
+
+        public static uint GetRt2(uint rt)
+        {
+            return Math.Min(rt + 1, PcRegister);
+        }
+
+        public static int ExtractRdn(InstFlags flags, uint encoding)
+        {
+            if (flags.HasFlag(InstFlags.Dn))
+            {
+                return ((int)(encoding >> RdRtT16Bit) & 7) | (int)((encoding >> 4) & 8);
+            }
+            else
+            {
+                return ExtractRdT16(flags, encoding);
+            }
+        }
+
+        public static int ExtractRdT16(InstFlags flags, uint encoding)
+        {
+            return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdRtT16AltBit) & 7 : (int)(encoding >> RdRtT16Bit) & 7;
+        }
+
+        public static int ExtractRtT16(InstFlags flags, uint encoding)
+        {
+            return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdRtT16AltBit) & 7 : (int)(encoding >> RdRtT16Bit) & 7;
+        }
+
+        public static int ExtractRdT32(InstFlags flags, uint encoding)
+        {
+            return flags.HasFlag(InstFlags.Rd16) ? (int)(encoding >> RdT32AltBit) & 0xf : (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
+        }
+
+        public static int ExtractRdLoT32(uint encoding)
+        {
+            return (int)(encoding >> RtRdLoT32Bit) & 0xf;
+        }
+
+        public static int ExtractRdHiT32(uint encoding)
+        {
+            return (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
+        }
+
+        public static int ExtractRtT32(uint encoding)
+        {
+            return (int)(encoding >> RtRdLoT32Bit) & 0xf;
+        }
+
+        public static int ExtractRt2T32(uint encoding)
+        {
+            return (int)(encoding >> RdRt2RdHiT32Bit) & 0xf;
+        }
+    }
+}