[Xen-changelog] [xen-4.0-testing] x86: emulate lea with two register operands correctly

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User David Vrabel <david.vrabel@xxxxxxxxxx>
# Date 1326800103 0
# Node ID 75007e524cd8e8065a179b6cc7e652d0a4cf1eec
# Parent  3f7117070ba1ed15e2a660dcc79e1a2bfe8e82fb
x86: emulate lea with two register operands correctly

An lea instruction with two register operands should raise an
undefined instruction exception.

Skype does such a instruction and will crash when starting if it does
not get the exception.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   24456:03781de56c31
xen-unstable date:        Thu Jan 05 15:47:16 2012 +0000
---


diff -r 3f7117070ba1 -r 75007e524cd8 xen/arch/x86/x86_emulate/x86_emulate.c
--- a/xen/arch/x86/x86_emulate/x86_emulate.c    Tue Jan 17 11:34:43 2012 +0000
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c    Tue Jan 17 11:35:03 2012 +0000
@@ -2056,6 +2056,7 @@
     }
 
     case 0x8d: /* lea */
+        generate_exception_if(ea.type != OP_MEM, EXC_UD, -1);
         dst.val = ea.mem.off;
         break;
 

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