include: Add some WOW64 definitions.

include/winnt.h

@@ -995,7 +995,7 @@ typedef struct _LDT_ENTRY {
             unsigned    BaseHi : 8;
         } Bits;
     } HighWord;
-} LDT_ENTRY, *PLDT_ENTRY;
+} LDT_ENTRY, *PLDT_ENTRY, WOW64_LDT_ENTRY, *PWOW64_LDT_ENTRY;
 
 /* x86-64 context definitions */
 #if defined(__x86_64__)
@@ -2112,6 +2112,74 @@ typedef CONTEXT *PCONTEXT;
 
 NTSYSAPI void WINAPI RtlCaptureContext(CONTEXT*);
 
+#define WOW64_CONTEXT_i386 0x00010000
+#define WOW64_CONTEXT_i486 0x00010000
+#define WOW64_CONTEXT_CONTROL (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000001))
+#define WOW64_CONTEXT_INTEGER (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000002))
+#define WOW64_CONTEXT_SEGMENTS (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000004))
+#define WOW64_CONTEXT_FLOATING_POINT (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000008))
+#define WOW64_CONTEXT_DEBUG_REGISTERS (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000010))
+#define WOW64_CONTEXT_EXTENDED_REGISTERS (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000020))
+#define WOW64_CONTEXT_FULL (WOW64_CONTEXT_CONTROL | WOW64_CONTEXT_INTEGER | WOW64_CONTEXT_SEGMENTS)
+#define WOW64_CONTEXT_ALL (WOW64_CONTEXT_CONTROL | WOW64_CONTEXT_INTEGER | \
+                           WOW64_CONTEXT_SEGMENTS | WOW64_CONTEXT_FLOATING_POINT | \
+                           WOW64_CONTEXT_DEBUG_REGISTERS | WOW64_CONTEXT_EXTENDED_REGISTERS)
+
+#define WOW64_CONTEXT_XSTATE (WOW64_CONTEXT_i386 | __MSABI_LONG(0x00000040))
+
+#define WOW64_CONTEXT_EXCEPTION_ACTIVE      0x08000000
+#define WOW64_CONTEXT_SERVICE_ACTIVE        0x10000000
+#define WOW64_CONTEXT_EXCEPTION_REQUEST     0x40000000
+#define WOW64_CONTEXT_EXCEPTION_REPORTING   0x80000000
+
+#define WOW64_SIZE_OF_80387_REGISTERS 80
+#define WOW64_MAXIMUM_SUPPORTED_EXTENSION 512
+
+typedef struct _WOW64_FLOATING_SAVE_AREA
+{
+    DWORD   ControlWord;
+    DWORD   StatusWord;
+    DWORD   TagWord;
+    DWORD   ErrorOffset;
+    DWORD   ErrorSelector;
+    DWORD   DataOffset;
+    DWORD   DataSelector;
+    BYTE    RegisterArea[WOW64_SIZE_OF_80387_REGISTERS];
+    DWORD   Cr0NpxState;
+} WOW64_FLOATING_SAVE_AREA, *PWOW64_FLOATING_SAVE_AREA;
+
+#include "pshpack4.h"
+typedef struct _WOW64_CONTEXT
+{
+    DWORD ContextFlags;
+    DWORD Dr0;
+    DWORD Dr1;
+    DWORD Dr2;
+    DWORD Dr3;
+    DWORD Dr6;
+    DWORD Dr7;
+    WOW64_FLOATING_SAVE_AREA FloatSave;
+    DWORD SegGs;
+    DWORD SegFs;
+    DWORD SegEs;
+    DWORD SegDs;
+    DWORD Edi;
+    DWORD Esi;
+    DWORD Ebx;
+    DWORD Edx;
+    DWORD Ecx;
+    DWORD Eax;
+    DWORD Ebp;
+    DWORD Eip;
+    DWORD SegCs;
+    DWORD EFlags;
+    DWORD Esp;
+    DWORD SegSs;
+    BYTE ExtendedRegisters[WOW64_MAXIMUM_SUPPORTED_EXTENSION];
+} WOW64_CONTEXT, *PWOW64_CONTEXT;
+#include "poppack.h"
+
+
 /*
  * Product types
  */