[PATCH v3 1/2] Push 0x7fff to the stack in __wine_syscall_dispatcher to recreate side effect of KiUserCallbackDispatcher needed by Skyrim Special Edition: Creation Kit

[Keaton Ens]

From: Keaton Ens

---
 dlls/ntdll/unix/signal_x86_64.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c
index 26b540bd629..bf520618cb6 100644
--- a/dlls/ntdll/unix/signal_x86_64.c
+++ b/dlls/ntdll/unix/signal_x86_64.c
@@ -2728,6 +2728,12 @@ __ASM_GLOBAL_FUNC( __wine_syscall_dispatcher,
 #else
                    "movq %gs:0x328,%rcx\n\t"       /* amd64_thread_data()->syscall_frame */
 #endif
+                   /* Skyrim Special Edition: Creation Kit depends on internal function calls
+                    * in KiUserCallbackDispatcher to push 0x7fff onto the stack to initialize a
+                    * local variable.*/
+                   "sub $0x4c,%rsp\n\t"
+                   "movl $0x7fff,(%rsp)\n\t"
+                   "add $0x4c,%rsp\n\t"
                    "popq 0x70(%rcx)\n\t"           /* frame->rip */
                    __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t")
                    __ASM_CFI_REG_IS_AT2(rip, rcx, 0xf0,0x00)