process EGPRs in VM only if APX is supported. Also, add AMD64VolatileContextPointers for windows

Author: khushal1996

src/coreclr/System.Private.CoreLib/src/System/Runtime/ExceptionServices/AsmOffsets.cs

@@ -20,7 +20,7 @@ class AsmOffsets
     public const int OFFSETOF__REGDISPLAY__SP = 0x1b78;
     public const int OFFSETOF__REGDISPLAY__ControlPC = 0x1b80;
 #else // TARGET_UNIX
-    public const int SIZEOF__REGDISPLAY = 0xbf0;
+    public const int SIZEOF__REGDISPLAY = 0xc70;
     public const int OFFSETOF__REGDISPLAY__SP = 0xbd8;
     public const int OFFSETOF__REGDISPLAY__ControlPC = 0xbe0;
 #endif // TARGET_UNIX

src/coreclr/inc/regdisp.h

@@ -197,7 +197,7 @@ typedef struct _Arm64VolatileContextPointer
 } Arm64VolatileContextPointer;
 #endif //TARGET_ARM64
 
-#if defined(TARGET_AMD64) && defined(TARGET_UNIX)
+#if defined(TARGET_AMD64)
 typedef struct _Amd64VolatileContextPointer
 {
     union {
@@ -222,7 +222,7 @@ typedef struct _Amd64VolatileContextPointer
         PDWORD64 R[16];
     };
 } Amd64VolatileContextPointer;
-#endif //TARGET_AMD64 && TARGET_UNIX
+#endif //TARGET_AMD64
 
 #if defined(TARGET_LOONGARCH64)
 typedef struct _LoongArch64VolatileContextPointer
@@ -280,7 +280,7 @@ struct REGDISPLAY : public REGDISPLAY_BASE {
     LoongArch64VolatileContextPointer    volatileCurrContextPointers;
 #endif
 
-#if defined(TARGET_AMD64) && defined(TARGET_UNIX)
+#if defined(TARGET_AMD64)
     Amd64VolatileContextPointer    volatileCurrContextPointers;
 #endif
 

src/coreclr/vm/codeman.h

@@ -70,6 +70,9 @@ Module Name:
 #ifdef TARGET_X86
 #include "gc_unwind_x86.h"
 #endif
+#ifdef TARGET_AMD64
+#include <minipal/cpufeatures.h>
+#endif
 
 class MethodDesc;
 class ICorJitCompiler;
@@ -2198,6 +2201,13 @@ class EEJitManager final : public EECodeGenManager
         return m_CPUCompileFlags;
     }
 
+#if defined(TARGET_AMD64)
+    inline bool IsAPXSupported()
+    {
+        return m_CPUCompileFlags.IsSet(InstructionSet_APX);
+    }
+#endif // TARGET_AMD64
+
 private :
     Crst                m_JitLoadLock;
 

src/coreclr/vm/gcinfodecoder.cpp

@@ -1502,13 +1502,11 @@ template <typename GcInfoEncoding> OBJECTREF* TGcInfoDecoder<GcInfoEncoding>::Ge
     // The fields of KNONVOLATILE_CONTEXT_POINTERS are in the same order as
     // the processor encoding numbers.
     ULONGLONG **ppRax = &pRD->pCurrentContextPointers->Rax;
-#if defined(TARGET_UNIX)
-    if(regNum >= 16)
+    if(ExecutionManager::GetEEJitManager()->IsAPXSupported() && regNum >= 16)
     {
         ppRax = &pRD->volatileCurrContextPointers.R16;
         return (OBJECTREF*)*(ppRax + regNum - 16);
     }
-#endif // TARGET_UNIX
 #endif // FEATURE_NATIVEAOT
 
     return (OBJECTREF*)*(ppRax + regNum);
@@ -1529,13 +1527,11 @@ template <typename GcInfoEncoding> OBJECTREF* TGcInfoDecoder<GcInfoEncoding>::Ge
 
     // The fields of CONTEXT are in the same order as
     // the processor encoding numbers.
-#if defined(TARGET_UNIX)
-    if (regNum >= 16)
+    if (ExecutionManager::GetEEJitManager()->IsAPXSupported() && regNum >= 16)
     {
         ULONGLONG *pRax = &pRD->pCurrentContext->R16;
         return (OBJECTREF*)(pRax + regNum - 16);
     }
-#endif // TARGET_UNIX
     ULONGLONG *pRax = &pRD->pCurrentContext->Rax;
 
     return (OBJECTREF*)(pRax + regNum);