cpukit/*: Correct implicit fallthrough warnings

Use RTEMS_FALL_THROUGH() to annotate case statements which
intentionally do not have a break statement.

cpukit/dev/can/ctucanfd/ctucanfd.c

@@ -1076,6 +1076,7 @@ static void ctucanfd_handle_txtb_done(
         ctucanfd_txb_free( internal, txb_order_idx );
         break;
       }
+      RTEMS_FALL_THROUGH();
     case TXT_ERR:
   #ifdef CTUCANFD_DEBUG
         printk("CTUCANFD TXT_ERR\n");

cpukit/libdebugger/rtems-debugger-microblaze.c

@@ -1338,6 +1338,7 @@ int rtems_debugger_target_exception_to_signal( CPU_Exception_frame *frame )
          return RTEMS_DEBUGGER_SIGNAL_TRAP;
        }
 
+       RTEMS_FALL_THROUGH();
      default:
        return RTEMS_DEBUGGER_SIGNAL_ILL;
     }

cpukit/libdebugger/rtems-debugger-target.c

@@ -231,10 +231,13 @@ rtems_debugger_target_swbreak_control(bool insert, uintptr_t addr, DB_UINT kind)
             switch (target->breakpoint_size) {
             case 4:
               loc[3] = swbreaks[i].contents[3];
+              RTEMS_FALL_THROUGH();
             case 3:
               loc[2] = swbreaks[i].contents[2];
+              RTEMS_FALL_THROUGH();
             case 2:
               loc[1] = swbreaks[i].contents[1];
+              RTEMS_FALL_THROUGH();
             case 1:
               loc[0] = swbreaks[i].contents[0];
               break;
@@ -269,10 +272,13 @@ rtems_debugger_target_swbreak_control(bool insert, uintptr_t addr, DB_UINT kind)
     switch (target->breakpoint_size) {
     case 4:
       contents[3] = loc[3];
+      RTEMS_FALL_THROUGH();
     case 3:
       contents[2] = loc[2];
+      RTEMS_FALL_THROUGH();
     case 2:
       contents[1] = loc[1];
+      RTEMS_FALL_THROUGH();
     case 1:
       contents[0] = loc[0];
       break;
@@ -315,10 +321,13 @@ rtems_debugger_target_swbreak_insert(void)
           switch (target->breakpoint_size) {
           case 4:
             loc[3] = target->breakpoint[3];
+            RTEMS_FALL_THROUGH();
           case 3:
             loc[2] = target->breakpoint[2];
+            RTEMS_FALL_THROUGH();
           case 2:
             loc[1] = target->breakpoint[1];
+            RTEMS_FALL_THROUGH();
           case 1:
             loc[0] = target->breakpoint[0];
             break;
@@ -358,10 +367,13 @@ rtems_debugger_target_swbreak_remove(void)
           switch (target->breakpoint_size) {
           case 4:
             loc[3] = contents[3];
+            RTEMS_FALL_THROUGH();
           case 3:
             loc[2] = contents[2];
+            RTEMS_FALL_THROUGH();
           case 2:
             loc[1] = contents[1];
+            RTEMS_FALL_THROUGH();
           case 1:
             loc[0] = contents[0];
             break;

cpukit/libdl/rtl-mdreloc-arm.c

@@ -633,6 +633,7 @@ rtems_rtl_elf_reloc_rel (rtems_rtl_obj*            obj,
     case R_TYPE(TLS_LE12):
     case R_TYPE(TLS_IE12GP):
       printf("TSL relocations not supported\n");
+      RTEMS_FALL_THROUGH();
 
     default:
       printf ("rtl: reloc unknown: sym = %" PRIu32 ", type = %" PRIu32 ", offset = %p",

cpukit/libfs/src/rfs/rtems-rfs-dir-hash.c

@@ -37,6 +37,7 @@
 #include "config.h"
 #endif
 
+#include <rtems/score/basedefs.h>
 #include <rtems/rfs/rtems-rfs-dir-hash.h>
 
 #ifdef __rtems__
@@ -342,17 +343,17 @@ rtems_rfs_dir_hash (const void *key, size_t length)
     /*-------------------------------- last block: affect all 32 bits of (c) */
     switch(length)                   /* all the case statements fall through */
     {
-      case 12: c+=((uint32_t)k[11])<<24;
+      case 12: c+=((uint32_t)k[11])<<24; RTEMS_FALL_THROUGH();
-      case 11: c+=((uint32_t)k[10])<<16;
+      case 11: c+=((uint32_t)k[10])<<16; RTEMS_FALL_THROUGH();
-      case 10: c+=((uint32_t)k[9])<<8;
+      case 10: c+=((uint32_t)k[9])<<8; RTEMS_FALL_THROUGH();
-      case 9 : c+=k[8];
+      case 9 : c+=k[8]; RTEMS_FALL_THROUGH();
-      case 8 : b+=((uint32_t)k[7])<<24;
+      case 8 : b+=((uint32_t)k[7])<<24; RTEMS_FALL_THROUGH();
-      case 7 : b+=((uint32_t)k[6])<<16;
+      case 7 : b+=((uint32_t)k[6])<<16; RTEMS_FALL_THROUGH();
-      case 6 : b+=((uint32_t)k[5])<<8;
+      case 6 : b+=((uint32_t)k[5])<<8; RTEMS_FALL_THROUGH();
-      case 5 : b+=k[4];
+      case 5 : b+=k[4]; RTEMS_FALL_THROUGH();
-      case 4 : a+=((uint32_t)k[3])<<24;
+      case 4 : a+=((uint32_t)k[3])<<24; RTEMS_FALL_THROUGH();
-      case 3 : a+=((uint32_t)k[2])<<16;
+      case 3 : a+=((uint32_t)k[2])<<16; RTEMS_FALL_THROUGH();
-      case 2 : a+=((uint32_t)k[1])<<8;
+      case 2 : a+=((uint32_t)k[1])<<8; RTEMS_FALL_THROUGH();
       case 1 : a+=k[0];
         break;
       case 0 : return c;

cpukit/libmisc/cpuuse/cpuusagetop.c

@@ -238,20 +238,21 @@ task_usage(Thread_Control* thread, void* arg)
       {
         default:
           data->sort_order = RTEMS_TOP_SORT_CURRENT;
-          /* drop through */
+          RTEMS_FALL_THROUGH();
         case RTEMS_TOP_SORT_CURRENT:
           if (CPU_usage_Equal_to(&current, &data->zero) ||
               CPU_usage_Less_than(&current, &data->current_usage[j]))
             continue;
+          RTEMS_FALL_THROUGH();
         case RTEMS_TOP_SORT_TOTAL:
           if (CPU_usage_Equal_to(&usage, &data->zero) ||
               CPU_usage_Less_than(&usage, &data->usage[j]))
             continue;
-          /* Fall through */
+          RTEMS_FALL_THROUGH();
         case RTEMS_TOP_SORT_REAL_PRI:
           if (thread->Real_priority.priority > data->tasks[j]->Real_priority.priority)
             continue;
-          /* Fall through */
+          RTEMS_FALL_THROUGH();
         case RTEMS_TOP_SORT_CURRENT_PRI:
           if (
             _Thread_Get_priority( thread )
@@ -259,7 +260,7 @@ task_usage(Thread_Control* thread, void* arg)
           ) {
             continue;
           }
-          /* Fall through */
+          RTEMS_FALL_THROUGH();
         case RTEMS_TOP_SORT_ID:
           if (thread->Object.id < data->tasks[j]->Object.id)
             continue;

cpukit/libmisc/shell/main_cp.c

@@ -529,6 +529,9 @@ copy(rtems_shell_cp_globals* cp_globals,
 		case S_IFSOCK:
 			warnx("%s is a socket (not copied).",
 				    curr->fts_path);
+#ifdef __rtems__
+			RTEMS_FALL_THROUGH();
+#endif
 		case S_IFIFO:
 			if (Rflag) {
 				if (copy_fifo(cp_globals, curr->fts_statp, !dne))

cpukit/libmisc/shell/main_ln.c

@@ -186,12 +186,15 @@ main_ln(rtems_shell_ln_globals* globals, int argc, char *argv[])
 	case 0:
 		usage(globals);
 		/* NOTREACHED */
+		RTEMS_UNREACHABLE();
 	case 1:				/* ln target */
 		exit(linkit(globals, argv[0], ".", 1));
 		/* NOTREACHED */
+		RTEMS_UNREACHABLE();
 	case 2:				/* ln target source */
 		exit(linkit(globals, argv[0], argv[1], 0));
 		/* NOTREACHED */
+		RTEMS_UNREACHABLE();
 	}
 
 					/* ln target1 target2 directory */

cpukit/libmisc/shell/shell.c

@@ -577,7 +577,7 @@ static int rtems_shell_line_editor(
           }
 
           up = 1;
-          /* drop through */
+          RTEMS_FALL_THROUGH();
 
         case 14:                        /* Control-N */
         {