gen-icount.h

   1 #include "qemu-timer.h"
   2
   3 /* Helpers for instruction counting code generation.  */
   4
   5 static TCGArg *icount_arg;
   6 static int icount_label;
   7
   8 static inline void gen_icount_start(void)
   9 {
  10     TCGv_i32 count;
  11
  12     if (!use_icount)
  13         return;
  14
  15     icount_label = gen_new_label();
  16     count = tcg_temp_local_new_i32();
  17     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u32));
  18     /* This is a horrid hack to allow fixing up the value later.  */
  19     icount_arg = gen_opparam_ptr + 1;
  20     tcg_gen_subi_i32(count, count, 0xdeadbeef);
  21
  22     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
  23     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u16.low));
  24     tcg_temp_free_i32(count);
  25 }
  26
  27 static void gen_icount_end(TranslationBlock *tb, int num_insns)
  28 {
  29     if (use_icount) {
  30         *icount_arg = num_insns;
  31         gen_set_label(icount_label);
  32         tcg_gen_exit_tb((tcg_target_long)tb + 2);
  33     }
  34 }
  35
  36 static inline void gen_io_start(void)
  37 {
  38     TCGv_i32 tmp = tcg_const_i32(1);
  39     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  40     tcg_temp_free_i32(tmp);
  41 }
  42
  43 static inline void gen_io_end(void)
  44 {
  45     TCGv_i32 tmp = tcg_const_i32(0);
  46     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  47     tcg_temp_free_i32(tmp);
  48 }