From: Ilya Leoshkevich <iii@linux.ibm.com>
To: "Laurent Vivier" <laurent@vivier.eu>,
"Eduardo Habkost" <eduardo@habkost.net>,
"Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Yanan Wang" <wangyanan55@huawei.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"David Hildenbrand" <david@redhat.com>,
"Peter Maydell" <peter.maydell@linaro.org>
Cc: qemu-devel@nongnu.org, qemu-s390x@nongnu.org,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v4 2/5] accel/tcg: Introduce is_same_page()
Date: Thu, 11 Aug 2022 11:55:31 +0200 [thread overview]
Message-ID: <20220811095534.241224-3-iii@linux.ibm.com> (raw)
In-Reply-To: <20220811095534.241224-1-iii@linux.ibm.com>
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
next prev parent reply other threads:[~2022-08-11 9:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 9:55 [PATCH v4 0/5] linux-user: Fix siginfo_t contents when jumping to non-readable pages Ilya Leoshkevich
2022-08-11 9:55 ` [PATCH v4 1/5] accel/tcg: Invalidate translations when clearing PAGE_EXEC Ilya Leoshkevich
2022-08-11 9:55 ` Ilya Leoshkevich [this message]
2022-08-11 16:59 ` [PATCH v4 2/5] accel/tcg: Introduce is_same_page() Richard Henderson
2022-08-11 9:55 ` [PATCH v4 3/5] target/s390x: Make translator stop before the end of a page Ilya Leoshkevich
2022-08-11 16:59 ` Richard Henderson
2022-08-11 9:55 ` [PATCH v4 4/5] target/i386: " Ilya Leoshkevich
2022-08-11 16:58 ` Richard Henderson
2022-08-11 17:22 ` Richard Henderson
2022-08-11 9:55 ` [PATCH v4 5/5] tests/tcg: Test siginfo_t contents when jumping to non-readable pages Ilya Leoshkevich
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