File:  [Qemu by Fabrice Bellard] / qemu / gen-icount.h
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:51 2018 UTC (2 years, 2 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0111, qemu0110, qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    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:     /* FIXME: This generates lousy code.  We can't use tcg_new_temp because
   15:        count needs to live over the conditional branch.  To workaround this
   16:        we allow the target to supply a convenient register temporary.  */
   17: #ifndef ICOUNT_TEMP
   18:     count = tcg_temp_local_new_i32();
   19: #else
   20:     count = ICOUNT_TEMP;
   21: #endif
   22:     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
   23:     /* This is a horrid hack to allow fixing up the value later.  */
   24:     icount_arg = gen_opparam_ptr + 1;
   25:     tcg_gen_subi_i32(count, count, 0xdeadbeef);
   26: 
   27:     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
   28:     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
   29: #ifndef ICOUNT_TEMP
   30:     tcg_temp_free_i32(count);
   31: #endif
   32: }
   33: 
   34: static void gen_icount_end(TranslationBlock *tb, int num_insns)
   35: {
   36:     if (use_icount) {
   37:         *icount_arg = num_insns;
   38:         gen_set_label(icount_label);
   39:         tcg_gen_exit_tb((long)tb + 2);
   40:     }
   41: }
   42: 
   43: static void inline gen_io_start(void)
   44: {
   45:     TCGv_i32 tmp = tcg_const_i32(1);
   46:     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
   47:     tcg_temp_free_i32(tmp);
   48: }
   49: 
   50: static inline void gen_io_end(void)
   51: {
   52:     TCGv_i32 tmp = tcg_const_i32(0);
   53:     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
   54:     tcg_temp_free_i32(tmp);
   55: }

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