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

1 files changed, 101 insertions, 0 deletions

diff --git a/src/Ryujinx.Cpu/LightningJit/Arm32/Block.cs b/src/Ryujinx.Cpu/LightningJit/Arm32/Block.cs
new file mode 100644
index 00000000..4729f694
--- /dev/null
+++ b/src/Ryujinx.Cpu/LightningJit/Arm32/Block.cs
@@ -0,0 +1,101 @@
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace Ryujinx.Cpu.LightningJit.Arm32
+{
+    class Block
+    {
+        public readonly ulong Address;
+        public readonly ulong EndAddress;
+        public readonly List<InstInfo> Instructions;
+        public readonly bool EndsWithBranch;
+        public readonly bool HasHostCall;
+        public readonly bool IsTruncated;
+        public readonly bool IsLoopEnd;
+        public readonly bool IsThumb;
+
+        public Block(
+            ulong address,
+            ulong endAddress,
+            List<InstInfo> instructions,
+            bool endsWithBranch,
+            bool hasHostCall,
+            bool isTruncated,
+            bool isLoopEnd,
+            bool isThumb)
+        {
+            Debug.Assert(isThumb || (int)((endAddress - address) / 4) == instructions.Count);
+
+            Address = address;
+            EndAddress = endAddress;
+            Instructions = instructions;
+            EndsWithBranch = endsWithBranch;
+            HasHostCall = hasHostCall;
+            IsTruncated = isTruncated;
+            IsLoopEnd = isLoopEnd;
+            IsThumb = isThumb;
+        }
+
+        public (Block, Block) SplitAtAddress(ulong address)
+        {
+            int splitIndex = FindSplitIndex(address);
+
+            if (splitIndex < 0)
+            {
+                return (null, null);
+            }
+
+            int splitCount = Instructions.Count - splitIndex;
+
+            // Technically those are valid, but we don't want to create empty blocks.
+            Debug.Assert(splitIndex != 0);
+            Debug.Assert(splitCount != 0);
+
+            Block leftBlock = new(
+                Address,
+                address,
+                Instructions.GetRange(0, splitIndex),
+                false,
+                HasHostCall,
+                false,
+                false,
+                IsThumb);
+
+            Block rightBlock = new(
+                address,
+                EndAddress,
+                Instructions.GetRange(splitIndex, splitCount),
+                EndsWithBranch,
+                HasHostCall,
+                IsTruncated,
+                IsLoopEnd,
+                IsThumb);
+
+            return (leftBlock, rightBlock);
+        }
+
+        private int FindSplitIndex(ulong address)
+        {
+            if (IsThumb)
+            {
+                ulong pc = Address;
+
+                for (int index = 0; index < Instructions.Count; index++)
+                {
+                    if (pc == address)
+                    {
+                        return index;
+                    }
+
+                    pc += Instructions[index].Flags.HasFlag(InstFlags.Thumb16) ? 2UL : 4UL;
+                }
+
+                return -1;
+            }
+            else
+            {
+                return (int)((address - Address) / 4);
+            }
+        }
+    }
+}