[XEN PATCH v2 4/7] xen/arm: traps: add ASSERT_UNREACHABLE() where needed

[Nicola Vetrini <nicola.vetrini@bugseng.com>]

The statements after a call to the noreturn function 'do_unexpected_trap'
can't be reached, thus violating MISRA C:2012 Rule 2.1
("A project shall not contain unreachable code.").
ASSERT_UNREACHABLE() is used to signal that the unreachable break-s are used as
a defensive coding measure to prevent inadvertent fallthrough.

Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com>
---
Changes in v2:
- Use ASSERT_UNREACHABLE() to prevent mistakes.
---
 xen/arch/arm/traps.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 3784e8276ef6..77220ba0927a 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2152,6 +2152,7 @@ void do_trap_hyp_sync(struct cpu_user_regs *regs)
     case HSR_EC_SVE:
         /* An SVE exception is a bug somewhere in hypervisor code */
         do_unexpected_trap("SVE trap at EL2", regs);
+        ASSERT_UNREACHABLE();
         break;
 #endif
     case HSR_EC_DATA_ABORT_CURR_EL:
@@ -2171,7 +2172,7 @@ void do_trap_hyp_sync(struct cpu_user_regs *regs)
             dump_hyp_walk(get_hfar(is_data));
 
         do_unexpected_trap(fault, regs);
-
+        ASSERT_UNREACHABLE();
         break;
     }
     default:
-- 
2.34.1