auto import from //depot/cupcake/@135843

1 files changed, 56 insertions, 0 deletions

diff --git a/gen-icount.h b/gen-icount.h
new file mode 100644
index 0000000..61545f1
--- /dev/null
+++ b/gen-icount.h
@@ -0,0 +1,56 @@
+/* Helpers for instruction counting code generation.  */
+
+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);
+}
+