[PATCH v3 2/3] ntdll: Stub Wow64Transition.

[Zebediah Figura]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45567
Signed-off-by: Zebediah Figura 
---
 dlls/ntdll/loader.c   | 48 +++++++++++++++++++++++++++++++++++++++++++
 dlls/ntdll/ntdll.spec |  1 +
 2 files changed, 49 insertions(+)

diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index a7015deeec4..8a328179c91 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -3998,6 +3998,49 @@ static void restart_winevdm( RTL_USER_PROCESS_PARAMETERS *params )
     RtlInitUnicodeString( &params->CommandLine, cmdline );
 }

+#ifndef _WIN64
+void *Wow64Transition;
+
+static void map_wow64cpu(void)
+{
+    SIZE_T size = page_size;
+    OBJECT_ATTRIBUTES attr;
+    UNICODE_STRING string;
+    HANDLE file, section;
+    void *address = NULL;
+    IO_STATUS_BLOCK io;
+    NTSTATUS status;
+
+    RtlInitUnicodeString( &string, L"\??\C:\windows\sysnative\wow64cpu.dll" );
+    InitializeObjectAttributes( &attr, &string, 0, NULL, NULL );
+    if ((status = NtOpenFile( &file, GENERIC_READ | SYNCHRONIZE, &attr, &io, FILE_SHARE_READ,
+                              FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE )))
+    {
+        WARN("failed to open wow64cpu, status %#x\n", status);
+        return;
+    }
+
+    if ((status = NtCreateSection( &section, STANDARD_RIGHTS_REQUIRED | SECTION_MAP_READ,
+                                   NULL, NULL, PAGE_READONLY, SEC_RESERVE, file )))
+    {
+        WARN("failed to create section, status %#x\n", status);
+        NtClose( file );
+        return;
+    }
+
+    if ((status = NtMapViewOfSection( section, NtCurrentProcess(), &address, 0,
+                                      0, NULL, &size, ViewShare, 0, PAGE_READONLY )))
+    {
+        WARN("failed to map section, status %#x\n", status);
+        NtClose( section );
+        NtClose( file );
+        return;
+    }
+
+    Wow64Transition = address;
+}
+#endif
+

/***********************************************************************
  *           process_init
@@ -4061,6 +4104,11 @@ static NTSTATUS process_init(void)
     status = build_builtin_module( params->DllPath.Buffer, &nt_name, meminfo.AllocationBase, 0, &wm );
     assert( !status );

+#ifndef _WIN64
+    if (is_wow64)
+        map_wow64cpu();
+#endif
+
     if ((status = load_dll( params->DllPath.Buffer, kernel32W, NULL, 0, &wm )) != STATUS_SUCCESS)
     {
         MESSAGE( "wine: could not load kernel32.dll, status %x\n", status );
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 36746d989c6..3f852639fe7 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -1131,6 +1131,7 @@
 @ stdcall WinSqmIsOptedIn()
 @ stdcall WinSqmSetDWORD(ptr long long)
 @ stdcall WinSqmStartSession(ptr long long)
+@ extern -arch=win32 Wow64Transition
 @ stdcall -private -syscall ZwAcceptConnectPort(ptr long ptr long ptr ptr) NtAcceptConnectPort
 @ stdcall -private -syscall ZwAccessCheck(ptr long long ptr ptr ptr ptr ptr) NtAccessCheck
 @ stdcall -private -syscall ZwAccessCheckAndAuditAlarm(ptr long ptr ptr ptr long ptr long ptr ptr ptr) NtAccessCheckAndAuditAlarm