From 997409d3d0bd6894f33e31ced251c0fdf523aa14 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Tue, 8 Jul 2008 15:07:00 -0700
Subject: xen64: deal with extra words Xen pushes onto exception frames

Xen pushes two extra words containing the values of rcx and r11.  This
pvop hook copies the words back into their appropriate registers, and
cleans them off the stack.  This leaves the stack in native form, so
the normal handler can run unchanged.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/xen/xen-asm_64.S | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'arch/x86/xen/xen-asm_64.S')

diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 4ec1082..b147b49 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -133,6 +133,11 @@ check_events:
 	ret
 #endif
 
+ENTRY(xen_adjust_exception_frame)
+	mov 8+0(%rsp),%rcx
+	mov 8+8(%rsp),%r11
+	ret $16
+
 ENTRY(xen_iret)
 	pushq $0
 	jmp hypercall_page + __HYPERVISOR_iret * 32
-- 
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