target/arm: Rename DISAS_UPDATE to DISAS_UPDATE_EXIT

Emphasize that the is_jmp option exits to the main loop.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200626033144.790098-6-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 20 insertions, 18 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 4cef862..e4795ae 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -1616,7 +1616,7 @@ static void handle_msr_i(DisasContext *s, uint32_t insn,
         gen_helper_msr_i_daifclear(cpu_env, t1);
         tcg_temp_free_i32(t1);
         /* For DAIFClear, exit the cpu loop to re-evaluate pending IRQs.  */
-        s->base.is_jmp = DISAS_UPDATE;
+        s->base.is_jmp = DISAS_UPDATE_EXIT;
         break;
 
     default:
@@ -1795,7 +1795,7 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
 
     if ((tb_cflags(s->base.tb) & CF_USE_ICOUNT) && (ri->type & ARM_CP_IO)) {
         /* I/O operations must end the TB here (whether read or write) */
-        s->base.is_jmp = DISAS_UPDATE;
+        s->base.is_jmp = DISAS_UPDATE_EXIT;
     }
     if (!isread && !(ri->type & ARM_CP_SUPPRESS_TB_END)) {
         /*
@@ -1810,7 +1810,7 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
          * but allow this to be suppressed by the register definition
          * (usually only necessary to work around guest bugs).
          */
-        s->base.is_jmp = DISAS_UPDATE;
+        s->base.is_jmp = DISAS_UPDATE_EXIT;
     }
 }
 
@@ -14292,7 +14292,7 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
             gen_goto_tb(dc, 1, dc->base.pc_next);
             break;
         default:
-        case DISAS_UPDATE:
+        case DISAS_UPDATE_EXIT:
             gen_a64_set_pc_im(dc->base.pc_next);
             /* fall through */
         case DISAS_EXIT:
diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index bf31b18..afa8a5f 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -123,7 +123,7 @@ static bool full_vfp_access_check(DisasContext *s, bool ignore_vfp_enabled)
              * this to be the last insn in the TB).
              */
             if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                s->base.is_jmp = DISAS_UPDATE;
+                s->base.is_jmp = DISAS_UPDATE_EXIT;
                 gen_io_start();
             }
             gen_helper_v7m_preserve_fp_state(cpu_env);
@@ -2860,6 +2860,6 @@ static bool trans_VLLDM_VLSTM(DisasContext *s, arg_VLLDM_VLSTM *a)
     tcg_temp_free_i32(fptr);
 
     /* End the TB, because we have updated FP control bits */
-    s->base.is_jmp = DISAS_UPDATE;
+    s->base.is_jmp = DISAS_UPDATE_EXIT;
     return true;
 }
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 795964d..146ff5d 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -2775,7 +2775,7 @@ static void gen_msr_banked(DisasContext *s, int r, int sysm, int rn)
     tcg_temp_free_i32(tcg_tgtmode);
     tcg_temp_free_i32(tcg_regno);
     tcg_temp_free_i32(tcg_reg);
-    s->base.is_jmp = DISAS_UPDATE;
+    s->base.is_jmp = DISAS_UPDATE_EXIT;
 }
 
 static void gen_mrs_banked(DisasContext *s, int r, int sysm, int rn)
@@ -2797,7 +2797,7 @@ static void gen_mrs_banked(DisasContext *s, int r, int sysm, int rn)
     tcg_temp_free_i32(tcg_tgtmode);
     tcg_temp_free_i32(tcg_regno);
     store_reg(s, rn, tcg_reg);
-    s->base.is_jmp = DISAS_UPDATE;
+    s->base.is_jmp = DISAS_UPDATE_EXIT;
 }
 
 /* Store value to PC as for an exception return (ie don't
@@ -5114,7 +5114,7 @@ static void gen_srs(DisasContext *s,
         tcg_temp_free_i32(tmp);
     }
     tcg_temp_free_i32(addr);
-    s->base.is_jmp = DISAS_UPDATE;
+    s->base.is_jmp = DISAS_UPDATE_EXIT;
 }
 
 /* Generate a label used for skipping this instruction */
@@ -8160,7 +8160,7 @@ static bool trans_SETEND(DisasContext *s, arg_SETEND *a)
     }
     if (a->E != (s->be_data == MO_BE)) {
         gen_helper_setend(cpu_env);
-        s->base.is_jmp = DISAS_UPDATE;
+        s->base.is_jmp = DISAS_UPDATE_EXIT;
     }
     return true;
 }
@@ -8873,7 +8873,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
             break;
         case DISAS_NEXT:
         case DISAS_TOO_MANY:
-        case DISAS_UPDATE:
+        case DISAS_UPDATE_EXIT:
             gen_set_pc_im(dc, dc->base.pc_next);
             /* fall through */
         default:
@@ -8900,7 +8900,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
         case DISAS_JUMP:
             gen_goto_ptr();
             break;
-        case DISAS_UPDATE:
+        case DISAS_UPDATE_EXIT:
             gen_set_pc_im(dc, dc->base.pc_next);
             /* fall through */
         default:
diff --git a/target/arm/translate.h b/target/arm/translate.h
index 19650a9..d5edef2 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -148,7 +148,8 @@ static inline void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
 
 /* is_jmp field values */
 #define DISAS_JUMP      DISAS_TARGET_0 /* only pc was modified dynamically */
-#define DISAS_UPDATE    DISAS_TARGET_1 /* cpu state was modified dynamically */
+/* CPU state was modified dynamically; exit to main loop for interrupts. */
+#define DISAS_UPDATE_EXIT  DISAS_TARGET_1
 /* These instructions trap after executing, so the A32/T32 decoder must
  * defer them until after the conditional execution state has been updated.
  * WFI also needs special handling when single-stepping.
@@ -164,11 +165,12 @@ static inline void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
  * custom end-of-TB code)
  */
 #define DISAS_BX_EXCRET DISAS_TARGET_8
-/* For instructions which want an immediate exit to the main loop,
- * as opposed to attempting to use lookup_and_goto_ptr. Unlike
- * DISAS_UPDATE this doesn't write the PC on exiting the translation
- * loop so you need to ensure something (gen_a64_set_pc_im or runtime
- * helper) has done so before we reach return from cpu_tb_exec.
+/*
+ * For instructions which want an immediate exit to the main loop, as opposed
+ * to attempting to use lookup_and_goto_ptr.  Unlike DISAS_UPDATE_EXIT, this
+ * doesn't write the PC on exiting the translation loop so you need to ensure
+ * something (gen_a64_set_pc_im or runtime helper) has done so before we reach
+ * return from cpu_tb_exec.
  */
 #define DISAS_EXIT      DISAS_TARGET_9