[RFC PATCH 1/4] cert:arch/arm: Add missing default labels to switch statements

[Oleksandr Andrushchenko <andr2000@gmail.com>]

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

It is required by MISRA [1] that every switch statement has a default
label as a measure of defensive programming technique.

The changes in this patch are to match MISRA C:2012: Rule 16.4
requirements.

[1] https://www.misra.org.uk/

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 xen/arch/arm/decode.c     |  3 +++
 xen/arch/arm/domain.c     | 10 ++++++++++
 xen/arch/arm/guest_walk.c |  2 ++
 xen/arch/arm/mm.c         |  3 +++
 xen/arch/arm/p2m.c        |  7 +++++++
 xen/arch/arm/traps.c      |  6 ++++++
 xen/arch/arm/vsmc.c       |  9 +++++++++
 7 files changed, 40 insertions(+)

diff --git a/xen/arch/arm/decode.c b/xen/arch/arm/decode.c
index 8b1e15d11892..1ed37696d678 100644
--- a/xen/arch/arm/decode.c
+++ b/xen/arch/arm/decode.c
@@ -112,6 +112,9 @@ static int decode_thumb(register_t pc, struct hsr_dabt *dabt)
         case 3: /* Signed byte */
             update_dabt(dabt, reg, 0, true);
             break;
+        default:
+            ASSERT_UNREACHABLE();
+            goto bad_thumb;
         }
 
         break;
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 6dc633ed5048..ecb43736a7c3 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -439,6 +439,11 @@ unsigned long hypercall_create_continuation(
                 case 3: regs->x3 = arg; break;
                 case 4: regs->x4 = arg; break;
                 case 5: regs->x5 = arg; break;
+                /*
+                 * arm_abi Hypercall Calling Convention:
+                 * A hypercall can take up to 5 arguments.
+                 */
+                default: BUG(); break;
                 }
             }
 
@@ -462,6 +467,11 @@ unsigned long hypercall_create_continuation(
                 case 3: regs->r3 = arg; break;
                 case 4: regs->r4 = arg; break;
                 case 5: regs->r5 = arg; break;
+                /*
+                 * arm_abi Hypercall Calling Convention:
+                 * A hypercall can take up to 5 arguments.
+                 */
+                default: BUG(); break;
                 }
             }
 
diff --git a/xen/arch/arm/guest_walk.c b/xen/arch/arm/guest_walk.c
index 7db7a7321b20..8c4be32b7ef8 100644
--- a/xen/arch/arm/guest_walk.c
+++ b/xen/arch/arm/guest_walk.c
@@ -101,6 +101,8 @@ static bool guest_walk_sd(const struct vcpu *v,
 
     switch ( pte.walk.dt )
     {
+    default:
+        /* Fall through. */
     case L1DESC_INVALID:
         return false;
 
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 01ae2cccc068..ba5bf5b2b3ba 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1112,6 +1112,9 @@ static void set_pte_flags_on_range(const char *p, unsigned long l, enum mg mg)
             pte.pt.xn = 0;
             pte.pt.ro = 1;
             break;
+        default:
+            pte.pt.valid = 0;
+            break;
         }
         write_pte(xen_xenmap + i, pte);
     }
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index c38bd7e16e26..1e12dc0fd482 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -540,6 +540,10 @@ static void p2m_set_permission(lpae_t *e, p2m_type_t t, p2m_access_t a)
     case p2m_max_real_type:
         BUG();
         break;
+
+    default:
+        BUG();
+        break;
     }
 
     /* Then restrict with access permissions */
@@ -574,6 +578,9 @@ static void p2m_set_permission(lpae_t *e, p2m_type_t t, p2m_access_t a)
         e->p2m.read = e->p2m.write = 0;
         e->p2m.xn = 1;
         break;
+    default:
+        BUG();
+        break;
     }
 }
 
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 8741aa1d59ce..42e1bd54d31f 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1306,6 +1306,10 @@ int do_bug_frame(const struct cpu_user_regs *regs, vaddr_t pc)
         show_execution_state(regs);
         panic("Assertion '%s' failed at %s%s:%d\n",
               predicate, prefix, filename, lineno);
+        break;
+
+    default:
+        break;
     }
 
     return -EINVAL;
@@ -1972,6 +1976,8 @@ static void do_trap_stage2_abort_guest(struct cpu_user_regs *regs,
                 advance_pc(regs, hsr);
                 return;
             case IO_UNHANDLED:
+                /* Fall through. */
+            default:
                 /* IO unhandled, try another way to handle it. */
                 break;
             }
diff --git a/xen/arch/arm/vsmc.c b/xen/arch/arm/vsmc.c
index c72b9a04ff76..9eabed89f9c5 100644
--- a/xen/arch/arm/vsmc.c
+++ b/xen/arch/arm/vsmc.c
@@ -109,6 +109,8 @@ static bool handle_arch(struct cpu_user_regs *regs)
         case ARM_SMCCC_ARCH_WORKAROUND_2_FID:
             switch ( get_ssbd_state() )
             {
+            default:
+                /* Fall through. */
             case ARM_SSBD_UNKNOWN:
             case ARM_SSBD_FORCE_DISABLE:
                 break;
@@ -123,6 +125,8 @@ static bool handle_arch(struct cpu_user_regs *regs)
                 break;
             }
             break;
+        default:
+            break;
         }
 
         set_user_reg(regs, 0, ret);
@@ -152,6 +156,9 @@ static bool handle_arch(struct cpu_user_regs *regs)
 
         return true;
     }
+
+    default:
+        break;
     }
 
     return false;
@@ -276,6 +283,8 @@ static bool vsmccc_handle_call(struct cpu_user_regs *regs)
         case ARM_SMCCC_OWNER_SIP:
             handled = platform_smc(regs);
             break;
+        default:
+            break;
         }
     }
 
-- 
2.20.1


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