gen-icount.h revision 9251866320b5f8329a043bb56b3a794f78d12849 
1/* Helpers for instruction counting code generation.  */
2
3static TCGArg *icount_arg;
4static int icount_label;
5
6static 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
25static 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
34static 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
41static 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