gen-icount.h

   1 #ifndef GEN_ICOUNT_H
   2 #define GEN_ICOUNT_H 1
   3
   4 #include "qemu-timer.h"
   5
   6 /* Helpers for instruction counting code generation.  */
   7
   8 static TCGArg *icount_arg;
   9 static int icount_label;
  10
  11 static inline void gen_icount_start(void)
  12 {
  13     TCGv_i32 count;
  14
  15     if (!use_icount)
  16         return;
  17
  18     icount_label = gen_new_label();
  19     count = tcg_temp_local_new_i32();
  20     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u32));
  21     /* This is a horrid hack to allow fixing up the value later.  */
  22     icount_arg = tcg_ctx.gen_opparam_ptr + 1;
  23     tcg_gen_subi_i32(count, count, 0xdeadbeef);
  24
  25     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
  26     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u16.low));
  27     tcg_temp_free_i32(count);
  28 }
  29
  30 static void gen_icount_end(TranslationBlock *tb, int num_insns)
  31 {
  32     if (use_icount) {
  33         *icount_arg = num_insns;
  34         gen_set_label(icount_label);
  35         tcg_gen_exit_tb((tcg_target_long)tb + 2);
  36     }
  37 }
  38
  39 static inline void gen_io_start(void)
  40 {
  41     TCGv_i32 tmp = tcg_const_i32(1);
  42     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  43     tcg_temp_free_i32(tmp);
  44 }
  45
  46 static inline void gen_io_end(void)
  47 {
  48     TCGv_i32 tmp = tcg_const_i32(0);
  49     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io));
  50     tcg_temp_free_i32(tmp);
  51 }
  52
  53 #endif