Alexandre Julliard : wow64: Initialize win32u syscall table when it is mapped.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f2a07805b9b027da9a1caaf6023abc90bc950459
URL:    https://gitlab.winehq.org/wine/wine/-/commit/f2a07805b9b027da9a1caaf6023abc9...

Author: Alexandre Julliard 
Date:   Tue Jan 10 15:35:53 2023 +0100

wow64: Initialize win32u syscall table when it is mapped.

---

dlls/wow64/syscall.c | 75 +++++++++++++---------------------------------------
 1 file changed, 18 insertions(+), 57 deletions(-)

diff --git a/dlls/wow64/syscall.c b/dlls/wow64/syscall.c
index 8be5a1c300c..5ba9cd14954 100644
--- a/dlls/wow64/syscall.c
+++ b/dlls/wow64/syscall.c
@@ -88,6 +88,7 @@ SYSTEM_DLL_INIT_BLOCK *pLdrSystemDllInitBlock = NULL;

/* wow64win syscall table */
 static const SYSTEM_SERVICE_TABLE *psdwhwin32;
+static HMODULE win32u_module;

/* cpu backend dll functions */
 static void *   (WINAPI *pBTCpuGetBopCode)(void);
@@ -392,17 +393,6 @@ static DWORD get_syscall_num( const BYTE *syscall )
 }

-/**********************************************************************
- *           init_image_mapping
- */
-void init_image_mapping( HMODULE module )
-{
-    void **ptr = RtlFindExportedRoutineByName( module, "Wow64Transition" );
-
-    if (ptr) *ptr = pBTCpuGetBopCode();
-}
-
-
 /**********************************************************************
  *           init_syscall_table
  */
@@ -467,6 +457,23 @@ static void init_syscall_table( HMODULE module, ULONG idx, const SYSTEM_SERVICE_
 }

+/**********************************************************************
+ *           init_image_mapping
+ */
+void init_image_mapping( HMODULE module )
+{
+    void **ptr = RtlFindExportedRoutineByName( module, "Wow64Transition" );
+
+    if (!ptr) return;
+    *ptr = pBTCpuGetBopCode();
+    if (!win32u_module && RtlFindExportedRoutineByName( module, "NtUserInitializeClientPfnArrays" ))
+    {
+        win32u_module = module;
+        init_syscall_table( win32u_module, 1, psdwhwin32 );
+    }
+}
+
+
 /**********************************************************************
  *           load_64bit_module
  */
@@ -489,48 +496,6 @@ static HMODULE load_64bit_module( const WCHAR *name )
 }

-/**********************************************************************
- *           load_32bit_module
- */
-static HMODULE load_32bit_module( const WCHAR *name )
-{
-    NTSTATUS status;
-    UNICODE_STRING str;
-    WCHAR path[MAX_PATH];
-    HANDLE file, mapping;
-    LARGE_INTEGER size;
-    IO_STATUS_BLOCK io;
-    OBJECT_ATTRIBUTES attr;
-    SIZE_T len = 0;
-    void *module = NULL;
-    const WCHAR *dir = get_machine_wow64_dir( current_machine );
-
-    swprintf( path, MAX_PATH, L"%s\%s", dir, name );
-    RtlInitUnicodeString( &str, path );
-    InitializeObjectAttributes( &attr, &str, OBJ_CASE_INSENSITIVE, 0, NULL );
-    if ((status = NtOpenFile( &file, GENERIC_READ | SYNCHRONIZE, &attr, &io,
-                              FILE_SHARE_READ | FILE_SHARE_DELETE,
-                              FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE ))) goto failed;
-
-    size.QuadPart = 0;
-    status = NtCreateSection( &mapping, STANDARD_RIGHTS_REQUIRED | SECTION_QUERY |
-                              SECTION_MAP_READ | SECTION_MAP_EXECUTE,
-                              NULL, &size, PAGE_EXECUTE_READ, SEC_IMAGE, file );
-    NtClose( file );
-    if (status) goto failed;
-
-    status = NtMapViewOfSection( mapping, GetCurrentProcess(), &module, 0, 0, NULL, &len,
-                                 ViewShare, 0, PAGE_EXECUTE_READ );
-    NtClose( mapping );
-    if (!status) return module;
-
-failed:
-    ERR( "failed to load dll %lx\n", status );
-    NtTerminateProcess( GetCurrentProcess(), status );
-    return NULL;
-}
-
-
 /**********************************************************************
  *           get_cpu_dll_name
  */
@@ -589,10 +554,6 @@ static DWORD WINAPI process_init( RTL_RUN_ONCE *once, void *param, void **contex
     *(void **)RtlFindExportedRoutineByName( module, "__wine_syscall_dispatcher" ) = pBTCpuGetBopCode();
     *(void **)RtlFindExportedRoutineByName( module, "__wine_unix_call_dispatcher" ) = p__wine_get_unix_opcode();

-    module = load_32bit_module( L"win32u.dll" );
-    init_syscall_table( module, 1, psdwhwin32 );
-    NtUnmapViewOfSection( GetCurrentProcess(), module );
-
     init_file_redirects();
     return TRUE;