[RFC PATCH 30/78] target/nios2: add fallthrough pseudo-keyword

[Emmanouil Pitsidianakis]

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/nios2/helper.c    | 6 +++---
 target/nios2/translate.c | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/target/nios2/helper.c b/target/nios2/helper.c
index bb3b09e5a7..b44e73768e 100644
--- a/target/nios2/helper.c
+++ b/target/nios2/helper.c
@@ -125,136 +125,136 @@ static void do_eic_irq(Nios2CPU *cpu)
 void nios2_cpu_do_interrupt(CPUState *cs)
 {
     Nios2CPU *cpu = NIOS2_CPU(cs);
     CPUNios2State *env = &cpu->env;
     uint32_t tlbmisc_set = 0;
 
     if (qemu_loglevel_mask(CPU_LOG_INT)) {
         const char *name = NULL;
 
         switch (cs->exception_index) {
         case EXCP_IRQ:
             name = "interrupt";
             break;
         case EXCP_TLB_X:
         case EXCP_TLB_D:
             if (env->ctrl[CR_STATUS] & CR_STATUS_EH) {
                 name = "TLB MISS (double)";
             } else {
                 name = "TLB MISS (fast)";
             }
             break;
         case EXCP_PERM_R:
         case EXCP_PERM_W:
         case EXCP_PERM_X:
             name = "TLB PERM";
             break;
         case EXCP_SUPERA_X:
         case EXCP_SUPERA_D:
             name = "SUPERVISOR (address)";
             break;
         case EXCP_SUPERI:
             name = "SUPERVISOR (insn)";
             break;
         case EXCP_ILLEGAL:
             name = "ILLEGAL insn";
             break;
         case EXCP_UNALIGN:
             name = "Misaligned (data)";
             break;
         case EXCP_UNALIGND:
             name = "Misaligned (destination)";
             break;
         case EXCP_DIV:
             name = "DIV error";
             break;
         case EXCP_TRAP:
             name = "TRAP insn";
             break;
         case EXCP_BREAK:
             name = "BREAK insn";
             break;
         case EXCP_SEMIHOST:
             name = "SEMIHOST insn";
             break;
         }
         if (name) {
             qemu_log("%s at pc=0x%08x\n", name, env->pc);
         } else {
             qemu_log("Unknown exception %d at pc=0x%08x\n",
                      cs->exception_index, env->pc);
         }
     }
 
     switch (cs->exception_index) {
     case EXCP_IRQ:
         /* Note that PC is advanced for interrupts as well. */
         env->pc += 4;
         if (cpu->eic_present) {
             do_eic_irq(cpu);
         } else {
             do_iic_irq(cpu);
         }
         break;
 
     case EXCP_TLB_D:
         tlbmisc_set = CR_TLBMISC_D;
-        /* fall through */
+        fallthrough;
     case EXCP_TLB_X:
         if (env->ctrl[CR_STATUS] & CR_STATUS_EH) {
             tlbmisc_set |= CR_TLBMISC_DBL;
             /*
              * Normally, we don't write to tlbmisc unless !EH,
              * so do it manually for the double-tlb miss exception.
              */
             env->ctrl[CR_TLBMISC] &= ~(CR_TLBMISC_D |
                                        CR_TLBMISC_PERM |
                                        CR_TLBMISC_BAD);
             env->ctrl[CR_TLBMISC] |= tlbmisc_set;
             do_exception(cpu, cpu->exception_addr, 0, false);
         } else {
             tlbmisc_set |= CR_TLBMISC_WE;
             do_exception(cpu, cpu->fast_tlb_miss_addr, tlbmisc_set, false);
         }
         break;
 
     case EXCP_PERM_R:
     case EXCP_PERM_W:
         tlbmisc_set = CR_TLBMISC_D;
-        /* fall through */
+        fallthrough;
     case EXCP_PERM_X:
         tlbmisc_set |= CR_TLBMISC_PERM;
         if (!(env->ctrl[CR_STATUS] & CR_STATUS_EH)) {
             tlbmisc_set |= CR_TLBMISC_WE;
         }
         do_exception(cpu, cpu->exception_addr, tlbmisc_set, false);
         break;
 
     case EXCP_SUPERA_D:
     case EXCP_UNALIGN:
         tlbmisc_set = CR_TLBMISC_D;
-        /* fall through */
+        fallthrough;
     case EXCP_SUPERA_X:
     case EXCP_UNALIGND:
         tlbmisc_set |= CR_TLBMISC_BAD;
         do_exception(cpu, cpu->exception_addr, tlbmisc_set, false);
         break;
 
     case EXCP_SUPERI:
     case EXCP_ILLEGAL:
     case EXCP_DIV:
     case EXCP_TRAP:
         do_exception(cpu, cpu->exception_addr, 0, false);
         break;
 
     case EXCP_BREAK:
         do_exception(cpu, cpu->exception_addr, 0, true);
         break;
 
     case EXCP_SEMIHOST:
         do_nios2_semihosting(env);
         break;
 
     default:
         cpu_abort(cs, "unhandled exception type=%d\n", cs->exception_index);
     }
 }
diff --git a/target/nios2/translate.c b/target/nios2/translate.c
index e806623594..2cfe77c90a 100644
--- a/target/nios2/translate.c
+++ b/target/nios2/translate.c
@@ -617,64 +617,64 @@ static void rdctl(DisasContext *dc, uint32_t code, 
uint32_t flags)
 /* ctlN <- rA */
 static void wrctl(DisasContext *dc, uint32_t code, uint32_t flags)
 {
     if (!gen_check_supervisor(dc)) {
         return;
     }
 
 #ifdef CONFIG_USER_ONLY
     g_assert_not_reached();
 #else
     R_TYPE(instr, code);
     TCGv v = load_gpr(dc, instr.a);
     uint32_t ofs = offsetof(CPUNios2State, ctrl[instr.imm5]);
     uint32_t wr = dc->cr_state[instr.imm5].writable;
     uint32_t ro = dc->cr_state[instr.imm5].readonly;
 
     /* Skip reserved or readonly registers. */
     if (wr == 0) {
         return;
     }
 
     switch (instr.imm5) {
     case CR_PTEADDR:
         gen_helper_mmu_write_pteaddr(tcg_env, v);
         break;
     case CR_TLBACC:
         gen_helper_mmu_write_tlbacc(tcg_env, v);
         break;
     case CR_TLBMISC:
         gen_helper_mmu_write_tlbmisc(tcg_env, v);
         break;
     case CR_STATUS:
     case CR_IENABLE:
         /* If interrupts were enabled using WRCTL, trigger them. */
         dc->base.is_jmp = DISAS_UPDATE;
-        /* fall through */
+        fallthrough;
     default:
         if (wr == -1) {
             /* The register is entirely writable. */
             tcg_gen_st_tl(v, tcg_env, ofs);
         } else {
             /*
              * The register is partially read-only or reserved:
              * merge the value.
              */
             TCGv n = tcg_temp_new();
 
             tcg_gen_andi_tl(n, v, wr);
 
             if (ro != 0) {
                 TCGv o = tcg_temp_new();
                 tcg_gen_ld_tl(o, tcg_env, ofs);
                 tcg_gen_andi_tl(o, o, ro);
                 tcg_gen_or_tl(n, n, o);
             }
 
             tcg_gen_st_tl(n, tcg_env, ofs);
         }
         break;
     }
 #endif
 }
 
 /* prs.rC <- rA */
-- 
2.39.2