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-rw-r--r--gen-icount.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/gen-icount.h b/gen-icount.h
new file mode 100644
index 0000000000..172b2bc7d7
--- /dev/null
+++ b/gen-icount.h
@@ -0,0 +1,56 @@
+/* Helpewrs for instruction counting code genration. */
+
+static TCGArg *icount_arg;
+static int icount_label;
+
+static inline void gen_icount_start(void)
+{
+ TCGv count;
+
+ if (!use_icount)
+ return;
+
+ icount_label = gen_new_label();
+ /* FIXME: This generates lousy code. We can't use tcg_new_temp because
+ count needs to live over the conditional branch. To workaround this
+ we allow the target to supply a convenient register temporary. */
+#ifndef ICOUNT_TEMP
+ count = tcg_temp_local_new(TCG_TYPE_I32);
+#else
+ count = ICOUNT_TEMP;
+#endif
+ tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
+ /* This is a horrid hack to allow fixing up the value later. */
+ icount_arg = gen_opparam_ptr + 1;
+ tcg_gen_subi_i32(count, count, 0xdeadbeef);
+
+ tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
+ tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
+#ifndef ICOUNT_TEMP
+ tcg_temp_free(count);
+#endif
+}
+
+static void gen_icount_end(TranslationBlock *tb, int num_insns)
+{
+ if (use_icount) {
+ *icount_arg = num_insns;
+ gen_set_label(icount_label);
+ tcg_gen_exit_tb((long)tb + 2);
+ }
+}
+
+static void inline gen_io_start(void)
+{
+ TCGv tmp = tcg_const_i32(1);
+ tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
+ tcg_temp_free(tmp);
+}
+
+static inline void gen_io_end(void)
+{
+ TCGv tmp = tcg_const_i32(0);
+ tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
+ tcg_temp_free(tmp);
+}
+