win32u: Support wow64 in NtAllocateVirtualMemory calls.

dlls/win32u/dc.c

@@ -112,8 +112,8 @@ static DC_ATTR *alloc_dc_attr(void)
     {
         SIZE_T size = system_info.AllocationGranularity;
         bucket->entries = NULL;
-        if (!NtAllocateVirtualMemory( GetCurrentProcess(), (void **)&bucket->entries, 0, &size,
-                                      MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE ))
+        if (!NtAllocateVirtualMemory( GetCurrentProcess(), (void **)&bucket->entries, zero_bits(),
+                                      &size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE ))
         {
             bucket->next_free = NULL;
             bucket->next_unused = bucket->entries + 1;

dlls/win32u/dib.c

@@ -1548,8 +1548,8 @@ HBITMAP WINAPI NtGdiCreateDIBSection( HDC hdc, HANDLE section, DWORD offset, con
     {
         SIZE_T size = bmp->dib.dsBmih.biSizeImage;
         offset = 0;
-        if (NtAllocateVirtualMemory( GetCurrentProcess(), &bmp->dib.dsBm.bmBits, 0, &size,
-                                     MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE ))
+        if (NtAllocateVirtualMemory( GetCurrentProcess(), &bmp->dib.dsBm.bmBits, zero_bits(),
+                                     &size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE ))
             goto error;
     }
     bmp->dib.dshSection = section;

dlls/win32u/gdiobj.c

@@ -566,8 +566,8 @@ static void init_gdi_shared(void)
 {
     SIZE_T size = sizeof(*gdi_shared);
 
-    if (NtAllocateVirtualMemory( GetCurrentProcess(), (void **)&gdi_shared, 0, &size,
-                                 MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE ))
+    if (NtAllocateVirtualMemory( GetCurrentProcess(), (void **)&gdi_shared, zero_bits(),
+                                 &size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE ))
         return;
     next_unused = gdi_shared->Handles + FIRST_GDI_HANDLE;
 

dlls/win32u/win32u_private.h

@@ -494,6 +494,15 @@ static inline BOOL is_win9x(void)
     return NtCurrentTeb()->Peb->OSPlatformId == VER_PLATFORM_WIN32s;
 }
 
+static inline ULONG_PTR zero_bits(void)
+{
+#ifdef _WIN64
+    return !NtCurrentTeb()->WowTebOffset ? 0 : 0x7fffffff;
+#else
+    return 0;
+#endif
+}
+
 static inline const char *debugstr_us( const UNICODE_STRING *us )
 {
     if (!us) return "<null>";