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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 19 Jul 2010 12:16:41 +0000 (UTC)
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Subject: svn commit: r210231 - stable/8/sys/amd64/amd64
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Author: kib
Date: Mon Jul 19 12:16:41 2010
New Revision: 210231
URL: http://svn.freebsd.org/changeset/base/210231

Log:
  MFC r209955:
  When switching the thread from the processor, store %dr7 content
  into the pcb before disabling watchpoints. Otherwise, when the
  thread is restored on a processor, watchpoints are still disabled.

Modified:
  stable/8/sys/amd64/amd64/cpu_switch.S
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/amd64/amd64/cpu_switch.S
==============================================================================
--- stable/8/sys/amd64/amd64/cpu_switch.S	Mon Jul 19 10:55:44 2010	(r210230)
+++ stable/8/sys/amd64/amd64/cpu_switch.S	Mon Jul 19 12:16:41 2010	(r210231)
@@ -245,13 +245,13 @@ store_dr:
 	movq	%dr2,%r13
 	movq	%dr3,%r12
 	movq	%dr6,%r11
-	andq	$0x0000fc00, %rax		/* disable all watchpoints */
 	movq	%r15,PCB_DR0(%r8)
 	movq	%r14,PCB_DR1(%r8)
 	movq	%r13,PCB_DR2(%r8)
 	movq	%r12,PCB_DR3(%r8)
 	movq	%r11,PCB_DR6(%r8)
 	movq	%rax,PCB_DR7(%r8)
+	andq	$0x0000fc00, %rax		/* disable all watchpoints */
 	movq	%rax,%dr7
 	jmp	done_store_dr