From f66b801a7591989f9daa08d7bbbc7190ef2aec23 Mon Sep 17 00:00:00 2001
From: Thomas Faber <thomas.faber@reactos.org>
Date: Sun, 17 Apr 2016 09:55:13 +0000
Subject: [PATCH] [NTOS:KE] - In debug builds, restore EBP early in
 KiSwitchThreads to get a sensible backtrace CORE-11123

svn path=/trunk/; revision=71175
---
 reactos/ntoskrnl/ke/i386/ctxswitch.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reactos/ntoskrnl/ke/i386/ctxswitch.S b/reactos/ntoskrnl/ke/i386/ctxswitch.S
index 7bd712eb634..bbeb462d11b 100644
--- a/reactos/ntoskrnl/ke/i386/ctxswitch.S
+++ b/reactos/ntoskrnl/ke/i386/ctxswitch.S
@@ -63,6 +63,10 @@ PUBLIC @KiSwitchThreads@8
 @KiSwitchThreads@8:
     /* Load the new kernel stack and switch OS to new thread */
     mov esp, edx
+#if DBG
+    /* Restore the frame pointer early to get sensible backtraces */
+    mov ebp, [esp+12]
+#endif
     call @KiSwapContextExit@8
 
     /* Now we're on the new thread. Return to the caller to restore registers */