1 files changed, 43 insertions, 0 deletions
diff --git a/src/vm/argslot.h b/src/vm/argslot.h
new file mode 100644
index 0000000000..9729227eed
--- /dev/null
+++ b/src/vm/argslot.h
@@ -0,0 +1,43 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+// ============================================================================
+// File: argslot.h
+//
+
+// ============================================================================
+// Contains the ARG_SLOT type.
+
+
+#ifndef __ARG_SLOT_H__
+#define __ARG_SLOT_H__
+
+// The ARG_SLOT must be big enough to represent all pointer and basic types (except for 80-bit fp values).
+// So, it's guaranteed to be at least 64-bit.
+typedef unsigned __int64 ARG_SLOT;
+#define SIZEOF_ARG_SLOT 8
+
+#if BIGENDIAN
+// Returns the address of the payload inside the argslot
+inline BYTE* ArgSlotEndianessFixup(ARG_SLOT* pArg, UINT cbSize) {
+    LIMITED_METHOD_CONTRACT;
+
+    BYTE* pBuf = (BYTE*)pArg;
+    switch (cbSize) {
+    case 1:
+        pBuf += 7;
+        break;
+    case 2:
+        pBuf += 6;
+        break;
+    case 4:
+        pBuf += 4;
+        break;
+    }
+    return pBuf;
+}
+#else
+#define ArgSlotEndianessFixup(pArg, cbSize) ((BYTE *)(pArg))
+#endif
+
+#endif  // __ARG_SLOT_H__