include/exec/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 static int exitreq_label;
  11
  12 static inline void gen_tb_start(void)
  13 {
  14     TCGv_i32 count;
  15     TCGv_i32 flag;
  16
  17     exitreq_label = gen_new_label();
  18     flag = tcg_temp_new_i32();
  19     tcg_gen_ld_i32(flag, cpu_env,
  20                    offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
  21     tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);
  22     tcg_temp_free_i32(flag);
  23
  24     if (!use_icount)
  25         return;
  26
  27     icount_label = gen_new_label();
  28     count = tcg_temp_local_new_i32();
  29     tcg_gen_ld_i32(count, cpu_env,
  30                    -ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
  31     /* This is a horrid hack to allow fixing up the value later.  */
  32     icount_arg = tcg_ctx.gen_opparam_ptr + 1;
  33     tcg_gen_subi_i32(count, count, 0xdeadbeef);
  34
  35     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
  36     tcg_gen_st16_i32(count, cpu_env,
  37                      -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
  38     tcg_temp_free_i32(count);
  39 }
  40
  41 static void gen_tb_end(TranslationBlock *tb, int num_insns)
  42 {
  43     gen_set_label(exitreq_label);
  44     tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
  45
  46     if (use_icount) {
  47         *icount_arg = num_insns;
  48         gen_set_label(icount_label);
  49         tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
  50     }
  51 }
  52
  53 static inline void gen_io_start(void)
  54 {
  55     TCGv_i32 tmp = tcg_const_i32(1);
  56     tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
  57     tcg_temp_free_i32(tmp);
  58 }
  59
  60 static inline void gen_io_end(void)
  61 {
  62     TCGv_i32 tmp = tcg_const_i32(0);
  63     tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
  64     tcg_temp_free_i32(tmp);
  65 }
  66
  67 #endif