[tfaber] 71175: [NTOS:KE] - In debug builds, restore EBP early in KiSwitchThreads to get a sensible backtrace CORE-11123

Author: tfaber
Date: Sun Apr 17 09:55:13 2016
New Revision: 71175

URL: http://svn.reactos.org/svn/reactos?rev=71175&view=rev
Log:
[NTOS:KE]
- In debug builds, restore EBP early in KiSwitchThreads to get a sensible backtrace
CORE-11123

Modified:
    trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S

Modified: trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/ctxswitch....
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S	[iso-8859-1] Sun Apr 17 09:55:13 2016
@@ -63,6 +63,10 @@
 @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 */