[reactos] 17/19: [NTOS:KE:X64] Handle pending user APC on syscall exit (should be done on trap exit, too)

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=637183a12c6627f09d732…

commit 637183a12c6627f09d732377142696628ef5bdec
Author:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
AuthorDate: Thu Jun 27 18:07:58 2019 +0200
Commit:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Sat Oct 31 14:23:16 2020 +0100

    [NTOS:KE:X64] Handle pending user APC on syscall exit (should be done on trap exit,
too)
---
 ntoskrnl/ke/amd64/trap.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ntoskrnl/ke/amd64/trap.S b/ntoskrnl/ke/amd64/trap.S
index 9c3c085d2e7..731e21b250a 100644
--- a/ntoskrnl/ke/amd64/trap.S
+++ b/ntoskrnl/ke/amd64/trap.S
@@ -806,6 +806,13 @@ PUBLIC KiSystemServiceExit
 IntsEnabled:
 #endif
 
+    /* Check for pending user APC */
+    mov rcx, gs:qword ptr [PcCurrentThread]
+    cmp byte ptr [rcx + ThApcState + AsUserApcPending], 0
+    jz no_user_apc_pending
+    call KiInitiateUserApc
+no_user_apc_pending:
+
     /* Disable interrupts for return */
     cli