socsvn commit: r269497 - soc2014/op/freebsd-base/sys/i386/i386

[op at FreeBSD.org]

Author: op
Date: Fri Jun 13 00:39:46 2014
New Revision: 269497
URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=269497

Log:
  SMAP i386: stac instruction should fail when used with lock prefix
  
  git: https://github.com/opntr/opBSD/commits/op/gsoc2014/smap
  
  Signed-off-by: Oliver Pinter <oliver.pntr at gmail.com>
  

Modified:
  soc2014/op/freebsd-base/sys/i386/i386/support.s

Modified: soc2014/op/freebsd-base/sys/i386/i386/support.s
==============================================================================
--- soc2014/op/freebsd-base/sys/i386/i386/support.s	Fri Jun 13 00:34:34 2014	(r269496)
+++ soc2014/op/freebsd-base/sys/i386/i386/support.s	Fri Jun 13 00:39:46 2014	(r269497)
@@ -421,10 +421,10 @@
 	cmpl	$VM_MAXUSER_ADDRESS-4,%edx	/* verify address is valid */
 	ja	fusufault
 
+	stac					/* open user-space */
 #ifdef SMP
 	lock
 #endif
-	stac					/* open user-space */
 	cmpxchgl %ecx,(%edx)			/* Compare and set. */
 	clac					/* close user-space */