File:  [Qemu by Fabrice Bellard] / qemu / gen-icount.h
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:34:48 2018 UTC (2 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, HEAD
qemu 0.12.0

    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: }

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