Alexandre Julliard : ntdll: Create the cross-process work list at startup on ARM64EC.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: e6fa673ad5e981d1114bb31235bd7f970c6bd78d
URL:    https://gitlab.winehq.org/wine/wine/-/commit/e6fa673ad5e981d1114bb31235bd7f9...

Author: Alexandre Julliard 
Date:   Tue Jul  9 12:19:55 2024 +0200

ntdll: Create the cross-process work list at startup on ARM64EC.

Copied from the corresponding code in wow64.dll.

---

dlls/ntdll/ntdll_misc.h     | 13 +++++++++++++
 dlls/ntdll/signal_arm64ec.c | 37 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/ntdll_misc.h b/dlls/ntdll/ntdll_misc.h
index bda4dd61d25..52875efa6b5 100644
--- a/dlls/ntdll/ntdll_misc.h
+++ b/dlls/ntdll/ntdll_misc.h
@@ -122,6 +122,19 @@ static inline void ascii_to_unicode( WCHAR *dst, const char *src, size_t len )
 extern TEB_FLS_DATA *fls_alloc_data(void);
 extern void heap_thread_detach(void);

+#if defined __aarch64__ || defined __arm64ec__
+/* equivalent of WOW64INFO, stored after the 64-bit PEB */
+struct arm64ec_shared_info
+{
+    ULONG                    Wow64ExecuteFlags;
+    USHORT                   NativeMachineType;
+    USHORT                   EmulatedMachineType;
+    HANDLE                   SectionHandle;
+    CROSS_PROCESS_WORK_LIST *CrossProcessWorkList;
+    void                    *unknown;
+};
+#endif
+
 /* register context */

#ifdef __i386__
diff --git a/dlls/ntdll/signal_arm64ec.c b/dlls/ntdll/signal_arm64ec.c
index 3fbdb63cb83..b48255678de 100644
--- a/dlls/ntdll/signal_arm64ec.c
+++ b/dlls/ntdll/signal_arm64ec.c
@@ -57,6 +57,40 @@ static inline BOOL is_valid_arm64ec_frame( ULONG_PTR frame )
 }

+/**********************************************************************
+ *           create_cross_process_work_list
+ */
+static NTSTATUS create_cross_process_work_list( struct arm64ec_shared_info *info )
+{
+    SIZE_T map_size = 0x4000;
+    LARGE_INTEGER size;
+    NTSTATUS status;
+    HANDLE section;
+    CROSS_PROCESS_WORK_LIST *list = NULL;
+    CROSS_PROCESS_WORK_ENTRY *end;
+    UINT i;
+
+    size.QuadPart = map_size;
+    status = NtCreateSection( &section, SECTION_ALL_ACCESS, NULL, &size, PAGE_READWRITE, SEC_COMMIT, 0 );
+    if (status) return status;
+    status = NtMapViewOfSection( section, GetCurrentProcess(), (void **)&list, 0, 0, NULL,
+                                 &map_size, ViewShare, MEM_TOP_DOWN, PAGE_READWRITE );
+    if (status)
+    {
+        NtClose( section );
+        return status;
+    }
+
+    end = (CROSS_PROCESS_WORK_ENTRY *)((char *)list + map_size);
+    for (i = 0; list->entries + i + 1 <= end; i++)
+        RtlWow64PushCrossProcessWorkOntoFreeList( &list->free_list, &list->entries[i] );
+
+    info->SectionHandle = section;
+    info->CrossProcessWorkList = list;
+    return STATUS_SUCCESS;
+}
+
+
 /**********************************************************************
  *           send_cross_process_notification
  */
@@ -97,6 +131,7 @@ static BOOL send_cross_process_notification( HANDLE process, UINT id, const void
 NTSTATUS arm64ec_process_init( HMODULE module )
 {
     NTSTATUS status = STATUS_SUCCESS;
+    struct arm64ec_shared_info *info = (struct arm64ec_shared_info *)(RtlGetCurrentPeb() + 1);

__os_arm64x_dispatch_call_no_redirect = RtlFindExportedRoutineByName( module, "ExitToX64" );
     __os_arm64x_dispatch_fptr = RtlFindExportedRoutineByName( module, "DispatchJump" );
@@ -108,7 +143,7 @@ NTSTATUS arm64ec_process_init( HMODULE module )
 #undef GET_PTR

if (pProcessInit) status = pProcessInit();
-
+    if (!status) status = create_cross_process_work_list( info );
     if (!status) status = arm64ec_thread_init();
     return status;
 }