1#include "qemu-timer.h"
2
3/* Helpers for instruction counting code generation.  */
4
5static TCGArg *icount_arg;
6static int icount_label;
7
8static 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
27static 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((tcg_target_long)tb + 2);
33    }
34}
35
36static 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
43static 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