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 11 static inline void gen_icount_start(void) 12 { 13 TCGv_i32 count; 14 15 if (!use_icount) 16 return; 17 18 icount_label = gen_new_label(); 19 count = tcg_temp_local_new_i32(); 20 tcg_gen_ld_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u32)); 21 /* This is a horrid hack to allow fixing up the value later. */ 22 icount_arg = tcg_ctx.gen_opparam_ptr + 1; 23 tcg_gen_subi_i32(count, count, 0xdeadbeef); 24 25 tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label); 26 tcg_gen_st16_i32(count, cpu_env, offsetof(CPUArchState, icount_decr.u16.low)); 27 tcg_temp_free_i32(count); 28 } 29 30 static void gen_icount_end(TranslationBlock *tb, int num_insns) 31 { 32 if (use_icount) { 33 *icount_arg = num_insns; 34 gen_set_label(icount_label); 35 tcg_gen_exit_tb((uintptr_t)tb + 2); 36 } 37 } 38 39 static inline void gen_io_start(void) 40 { 41 TCGv_i32 tmp = tcg_const_i32(1); 42 tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io)); 43 tcg_temp_free_i32(tmp); 44 } 45 46 static inline void gen_io_end(void) 47 { 48 TCGv_i32 tmp = tcg_const_i32(0); 49 tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUArchState, can_do_io)); 50 tcg_temp_free_i32(tmp); 51 } 52 53 #endif 54
