[XEN PATCH 08/12] x86/emul: add defensive code

[Federico Serafini <federico.serafini@xxxxxxxxxxx>]

Add defensive code after unreachable program points.
This also meets the requirements to deviate a violation of MISRA C:2012
Rule 16.3: "An unconditional `break' statement shall terminate every
switch-clause".

Signed-off-by: Federico Serafini <federico.serafini@xxxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index e12fbe3100..2b03d65fce 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -6831,6 +6831,8 @@ x86_emulate(
             break;
         default:
             ASSERT_UNREACHABLE();
+            rc = X86EMUL_UNHANDLEABLE;
+            goto done;
         }
         break;
 #ifdef HAVE_AS_SSE4_2
@@ -6859,6 +6861,8 @@ x86_emulate(
 # endif
         default:
             ASSERT_UNREACHABLE();
+            rc = X86EMUL_UNHANDLEABLE;
+            goto done;
         }
         break;
 #endif
-- 
2.34.1