Alexandre Julliard : wow64: Preserve the CPURESERVED flags across user callbacks.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 51c3cfddfe03fa35ab21aeac6230c28d877b20f1
URL:    https://gitlab.winehq.org/wine/wine/-/commit/51c3cfddfe03fa35ab21aeac6230c28...

Author: Alexandre Julliard <julliard(a)winehq.org>
Date:   Fri Feb 10 13:55:54 2023 +0100

wow64: Preserve the CPURESERVED flags across user callbacks.

---

 dlls/wow64/syscall.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/wow64/syscall.c b/dlls/wow64/syscall.c
index 41860aeb281..d2242134819 100644
--- a/dlls/wow64/syscall.c
+++ b/dlls/wow64/syscall.c
@@ -1044,9 +1044,11 @@ void WINAPI Wow64ApcRoutine( ULONG_PTR arg1, ULONG_PTR arg2, ULONG_PTR arg3, CON
 NTSTATUS WINAPI Wow64KiUserCallbackDispatcher( ULONG id, void *args, ULONG len,
                                                void **ret_ptr, ULONG *ret_len )
 {
+    WOW64_CPURESERVED *cpu = NtCurrentTeb()->TlsSlots[WOW64_TLS_CPURESERVED];
     TEB32 *teb32 = (TEB32 *)((char *)NtCurrentTeb() + NtCurrentTeb()->WowTebOffset);
     ULONG teb_frame = teb32->Tib.ExceptionList;
     struct user_callback_frame frame;
+    USHORT flags = cpu->Flags;
 
     frame.prev_frame = NtCurrentTeb()->TlsSlots[WOW64_TLS_USERCALLBACKDATA];
     frame.temp_list  = NtCurrentTeb()->TlsSlots[WOW64_TLS_TEMPLIST];
@@ -1115,6 +1117,7 @@ NTSTATUS WINAPI Wow64KiUserCallbackDispatcher( ULONG id, void *args, ULONG len,
     teb32->Tib.ExceptionList = teb_frame;
     NtCurrentTeb()->TlsSlots[WOW64_TLS_USERCALLBACKDATA] = frame.prev_frame;
     NtCurrentTeb()->TlsSlots[WOW64_TLS_TEMPLIST] = frame.temp_list;
+    cpu->Flags = flags;
     return frame.status;
 }