LXR qemu/gen-icount.h

   1/* Helpers for instruction counting code generation.  */
   2
   3static TCGArg *icount_arg;
   4static int icount_label;
   5
   6static 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
  25static 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
  34static 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
  41static 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}
  47