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

# HG changeset patch
# User David Vrabel <david.vrabel@xxxxxxxxxx>
# Date 1325778436 0
# Node ID 03781de56c31072266fb464e7dfeec133bcf0fb4
# Parent  94180a5a0c7c7d680ede2e54bd13f56ed43f452d
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>

diff -r 94180a5a0c7c -r 03781de56c31 xen/arch/x86/x86_emulate/x86_emulate.c
--- a/xen/arch/x86/x86_emulate/x86_emulate.c    Tue Dec 20 08:21:11 2011 +0100
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c    Thu Jan 05 15:47:16 2012 +0000
@@ -2240,6 +2240,7 @@
     case 0x8d: /* lea */
+        generate_exception_if(ea.type != OP_MEM, EXC_UD, -1);
         dst.val = ea.mem.off;

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