Annotation of qemu/gen-icount.h, revision 1.1.1.1
1.1 root 1: /* Helpers for instruction counting code generation. */
2:
3: static TCGArg *icount_arg;
4: static int icount_label;
5:
6: static 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: /* FIXME: This generates lousy code. We can't use tcg_new_temp because
15: count needs to live over the conditional branch. To workaround this
16: we allow the target to supply a convenient register temporary. */
17: #ifndef ICOUNT_TEMP
18: count = tcg_temp_local_new_i32();
19: #else
20: count = ICOUNT_TEMP;
21: #endif
22: tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
23: /* This is a horrid hack to allow fixing up the value later. */
24: icount_arg = gen_opparam_ptr + 1;
25: tcg_gen_subi_i32(count, count, 0xdeadbeef);
26:
27: tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
28: tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
29: #ifndef ICOUNT_TEMP
30: tcg_temp_free_i32(count);
31: #endif
32: }
33:
34: static void gen_icount_end(TranslationBlock *tb, int num_insns)
35: {
36: if (use_icount) {
37: *icount_arg = num_insns;
38: gen_set_label(icount_label);
39: tcg_gen_exit_tb((long)tb + 2);
40: }
41: }
42:
43: static void inline gen_io_start(void)
44: {
45: TCGv_i32 tmp = tcg_const_i32(1);
46: tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
47: tcg_temp_free_i32(tmp);
48: }
49:
50: static inline void gen_io_end(void)
51: {
52: TCGv_i32 tmp = tcg_const_i32(0);
53: tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
54: tcg_temp_free_i32(tmp);
55: }
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