In preparation of raising -Wimplicit-fallthrough to 5, replace all
fall-through comments with the fallthrough attribute pseudo-keyword.

Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 target/sh4/helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/sh4/helper.c b/target/sh4/helper.c
index e02e7af607..c1cc5e82f4 100644
--- a/target/sh4/helper.c
+++ b/target/sh4/helper.c
@@ -56,131 +56,131 @@ int cpu_sh4_is_cached(CPUSH4State *env, target_ulong addr)
 void superh_cpu_do_interrupt(CPUState *cs)
 {
     SuperHCPU *cpu = SUPERH_CPU(cs);
     CPUSH4State *env = &cpu->env;
     int do_irq = cs->interrupt_request & CPU_INTERRUPT_HARD;
     int do_exp, irq_vector = cs->exception_index;
 
     /* prioritize exceptions over interrupts */
 
     do_exp = cs->exception_index != -1;
     do_irq = do_irq && (cs->exception_index == -1);
 
     if (env->sr & (1u << SR_BL)) {
         if (do_exp && cs->exception_index != 0x1e0) {
             /* In theory a masked exception generates a reset exception,
                which in turn jumps to the reset vector. However this only
                works when using a bootloader. When using a kernel and an
                initrd, they need to be reloaded and the program counter
                should be loaded with the kernel entry point.
                qemu_system_reset_request takes care of that.  */
             qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
             return;
         }
         if (do_irq && !env->in_sleep) {
             return; /* masked */
         }
     }
     env->in_sleep = 0;
 
     if (do_irq) {
         irq_vector = sh_intc_get_pending_vector(env->intc_handle,
 						(env->sr >> 4) & 0xf);
         if (irq_vector == -1) {
             return; /* masked */
 	}
     }
 
     if (qemu_loglevel_mask(CPU_LOG_INT)) {
 	const char *expname;
         switch (cs->exception_index) {
 	case 0x0e0:
 	    expname = "addr_error";
 	    break;
 	case 0x040:
 	    expname = "tlb_miss";
 	    break;
 	case 0x0a0:
 	    expname = "tlb_violation";
 	    break;
 	case 0x180:
 	    expname = "illegal_instruction";
 	    break;
 	case 0x1a0:
 	    expname = "slot_illegal_instruction";
 	    break;
 	case 0x800:
 	    expname = "fpu_disable";
 	    break;
 	case 0x820:
 	    expname = "slot_fpu";
 	    break;
 	case 0x100:
 	    expname = "data_write";
 	    break;
 	case 0x060:
 	    expname = "dtlb_miss_write";
 	    break;
 	case 0x0c0:
 	    expname = "dtlb_violation_write";
 	    break;
 	case 0x120:
 	    expname = "fpu_exception";
 	    break;
 	case 0x080:
 	    expname = "initial_page_write";
 	    break;
 	case 0x160:
 	    expname = "trapa";
 	    break;
 	default:
             expname = do_irq ? "interrupt" : "???";
             break;
 	}
 	qemu_log("exception 0x%03x [%s] raised\n",
 		  irq_vector, expname);
         log_cpu_state(cs, 0);
     }
 
     env->ssr = cpu_read_sr(env);
     env->spc = env->pc;
     env->sgr = env->gregs[15];
     env->sr |= (1u << SR_BL) | (1u << SR_MD) | (1u << SR_RB);
     env->lock_addr = -1;
 
     if (env->flags & TB_FLAG_DELAY_SLOT_MASK) {
         /* Branch instruction should be executed again before delay slot. */
 	env->spc -= 2;
 	/* Clear flags for exception/interrupt routine. */
         env->flags &= ~TB_FLAG_DELAY_SLOT_MASK;
     }
 
     if (do_exp) {
         env->expevt = cs->exception_index;
         switch (cs->exception_index) {
         case 0x000:
         case 0x020:
         case 0x140:
             env->sr &= ~(1u << SR_FD);
             env->sr |= 0xf << 4; /* IMASK */
             env->pc = 0xa0000000;
             break;
         case 0x040:
         case 0x060:
             env->pc = env->vbr + 0x400;
             break;
         case 0x160:
             env->spc += 2; /* special case for TRAPA */
-            /* fall through */
+            fallthrough;
         default:
             env->pc = env->vbr + 0x100;
             break;
         }
         return;
     }
 
     if (do_irq) {
         env->intevt = irq_vector;
         env->pc = env->vbr + 0x600;
         return;
     }
 }
-- 
2.39.2