[PATCH v4 2/5] accel/tcg: Introduce is_same_page()

[Ilya Leoshkevich]

Introduce a function that checks whether a given address is on the same
page as where disassembly started. Having it improves readability of
the following patches.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 include/exec/translator.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/exec/translator.h b/include/exec/translator.h
index 7db6845535..d27f8c33b6 100644
--- a/include/exec/translator.h
+++ b/include/exec/translator.h
@@ -187,4 +187,14 @@ FOR_EACH_TRANSLATOR_LD(GEN_TRANSLATOR_LD)
 
 #undef GEN_TRANSLATOR_LD
 
+/*
+ * Return whether addr is on the same page as where disassembly started.
+ * Translators can use this to enforce the rule that only single-insn
+ * translation blocks are allowed to cross page boundaries.
+ */
+static inline bool is_same_page(DisasContextBase *db, target_ulong addr)
+{
+    return ((addr ^ db->pc_first) & TARGET_PAGE_MASK) == 0;
+}
+
 #endif /* EXEC__TRANSLATOR_H */
-- 
2.37.1