Enable ARM32 support and handle undefined instructions

Ryujinx.HLE/HOS/Horizon.cs

@@ -225,11 +225,6 @@ namespace Ryujinx.HLE.HOS
                 }
             }
 
-            if (!metaData.Is64Bits)
-            {
-                throw new NotImplementedException("32-bit titles are unsupported!");
-            }
-
             CurrentTitle = metaData.Aci0.TitleId.ToString("x16");
 
             LoadNso("rtld");
@@ -543,11 +538,6 @@ namespace Ryujinx.HLE.HOS
                 CurrentTitle = metaData.Aci0.TitleId.ToString("x16");
             }
 
-            if (!metaData.Is64Bits)
-            {
-                throw new NotImplementedException("32-bit titles are not supported!");
-            }
-
             LoadNso("rtld");
             LoadNso("main");
             LoadNso("subsdk");

Ryujinx.HLE/HOS/Kernel/Process/HleProcessDebugger.cs

@@ -78,6 +78,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
                 }
             }
 
+            //TODO: ARM32.
             long framePointer = (long)threadState.X29;
 
             while (framePointer != 0)
@@ -245,6 +246,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
             long ehHdrEndOffset   = memory.ReadInt32(mod0Offset + 0x14) + mod0Offset;
             long modObjOffset     = memory.ReadInt32(mod0Offset + 0x18) + mod0Offset;
 
+            //TODO: Elf32.
             while (true)
             {
                 long tagVal = memory.ReadInt64(dynamicOffset + 0);

Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs

@@ -3,6 +3,7 @@ using ChocolArm64.Events;
 using ChocolArm64.Memory;
 using Ryujinx.Common;
 using Ryujinx.Common.Logging;
+using Ryujinx.HLE.Exceptions;
 using Ryujinx.HLE.HOS.Kernel.Common;
 using Ryujinx.HLE.HOS.Kernel.Memory;
 using Ryujinx.HLE.HOS.Kernel.SupervisorCall;
@@ -797,6 +798,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
         {
             context.ThreadState.Interrupt += InterruptHandler;
             context.ThreadState.SvcCall   += _svcHandler.SvcCall;
+            context.ThreadState.Undefined += UndefinedInstructionHandler;
         }
 
         private void InterruptHandler(object sender, EventArgs e)
@@ -1021,5 +1023,10 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
         {
             Logger.PrintInfo(LogClass.Cpu, $"Executing at 0x{e.Position:X16}.");
         }
+
+        private void UndefinedInstructionHandler(object sender, InstUndefinedEventArgs e)
+        {
+            throw new UndefinedInstructionException(e.Position, e.RawOpCode);
+        }
     }
 }

Ryujinx.HLE/HOS/Kernel/Threading/KThread.cs

@@ -152,6 +152,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Threading
 
             Context = new CpuThread(owner.Translator, owner.CpuMemory, (long)entrypoint);
 
+            Context.ThreadState.IsAarch32 = (Owner.MmuFlags & 1) == 0;
+
             Context.ThreadState.X0  = argsPtr;
             Context.ThreadState.X31 = stackTop;
 

Ryujinx.HLE/HOS/ProgramLoader.cs

@@ -125,9 +125,14 @@ namespace Ryujinx.HLE.HOS
             IExecutable[] staticObjects,
             byte[]        arguments = null)
         {
+            if (!metaData.Is64Bits)
+            {
+                Logger.PrintWarning(LogClass.Loader, "32-bits application detected!");
+            }
+
             ulong argsStart = 0;
             int   argsSize  = 0;
-            ulong codeStart = 0x8000000;
+            ulong codeStart = metaData.Is64Bits ? 0x8000000UL : 0x200000UL;
             int   codeSize  = 0;
 
             ulong[] nsoBase = new ulong[staticObjects.Length];