gen-icount.h

   1 /* Helpers for instruction counting code generation.  */
   2
   3 static TCGArg *icount_arg;
   4 static int icount_label;
   5
   6 static inline void gen_icount_start(void)
   7 {
   8     TCGv_i32 count;
   9
  10     if (!use_icount)
  11         return;
  12
  13     icount_label = gen_new_label();
  14     count = tcg_temp_local_new_i32();
  15     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
  16     /* This is a horrid hack to allow fixing up the value later.  */
  17     icount_arg = gen_opparam_ptr + 1;
  18     tcg_gen_subi_i32(count, count, 0xdeadbeef);
  19
  20     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
  21     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
  22     tcg_temp_free_i32(count);
  23 }
  24
  25 static void gen_icount_end(TranslationBlock *tb, int num_insns)
  26 {
  27     if (use_icount) {
  28         *icount_arg = num_insns;
  29         gen_set_label(icount_label);
  30         tcg_gen_exit_tb((long)tb + 2);
  31     }
  32 }
  33
  34 static inline void gen_io_start(void)
  35 {
  36     TCGv_i32 tmp = tcg_const_i32(1);
  37     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
  38     tcg_temp_free_i32(tmp);
  39 }
  40
  41 static inline void gen_io_end(void)
  42 {
  43     TCGv_i32 tmp = tcg_const_i32(0);
  44     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
  45     tcg_temp_free_i32(tmp);
  46 }