diff mbox series

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

Message ID 20220811095534.241224-3-iii@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series linux-user: Fix siginfo_t contents when jumping to non-readable pages | expand

Commit Message

Ilya Leoshkevich Aug. 11, 2022, 9:55 a.m. UTC
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(+)

Comments

Richard Henderson Aug. 11, 2022, 4:59 p.m. UTC | #1
On 8/11/22 02:55, Ilya Leoshkevich wrote:
> 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>

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~
diff mbox series

Patch

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 */