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