xref: /illumos-kvm-cmd/gen-icount.h (revision 68396ea9)
1 #include "qemu-timer.h"
2 
3 /* Helpers for instruction counting code generation.  */
4 
5 static TCGArg *icount_arg;
6 static int icount_label;
7 
gen_icount_start(void)8 static inline void gen_icount_start(void)
9 {
10     TCGv_i32 count;
11 
12     if (!use_icount)
13         return;
14 
15     icount_label = gen_new_label();
16     count = tcg_temp_local_new_i32();
17     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
18     /* This is a horrid hack to allow fixing up the value later.  */
19     icount_arg = gen_opparam_ptr + 1;
20     tcg_gen_subi_i32(count, count, 0xdeadbeef);
21 
22     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
23     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
24     tcg_temp_free_i32(count);
25 }
26 
gen_icount_end(TranslationBlock * tb,int num_insns)27 static void gen_icount_end(TranslationBlock *tb, int num_insns)
28 {
29     if (use_icount) {
30         *icount_arg = num_insns;
31         gen_set_label(icount_label);
32         tcg_gen_exit_tb((long)tb + 2);
33     }
34 }
35 
gen_io_start(void)36 static inline void gen_io_start(void)
37 {
38     TCGv_i32 tmp = tcg_const_i32(1);
39     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
40     tcg_temp_free_i32(tmp);
41 }
42 
gen_io_end(void)43 static inline void gen_io_end(void)
44 {
45     TCGv_i32 tmp = tcg_const_i32(0);
46     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
47     tcg_temp_free_i32(tmp);
48 }
49