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 } 47
