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[PULL v3 07/20] accel/tcg: Introduce is_same_page()
From: |
Richard Henderson |
Subject: |
[PULL v3 07/20] accel/tcg: Introduce is_same_page() |
Date: |
Tue, 6 Sep 2022 09:38:02 +0100 |
From: Ilya Leoshkevich <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.
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20220811095534.241224-3-iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[rth: Make the DisasContextBase parameter const.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/exec/translator.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/exec/translator.h b/include/exec/translator.h
index 7db6845535..0d0bf3a31e 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(const DisasContextBase *db, target_ulong addr)
+{
+ return ((addr ^ db->pc_first) & TARGET_PAGE_MASK) == 0;
+}
+
#endif /* EXEC__TRANSLATOR_H */
--
2.34.1
- [PULL v3 00/20] tcg patch queue, Richard Henderson, 2022/09/06
- [PULL v3 03/20] linux-user/x86_64: Allocate vsyscall page as a commpage, Richard Henderson, 2022/09/06
- [PULL v3 02/20] linux-user/hppa: Allocate page zero as a commpage, Richard Henderson, 2022/09/06
- [PULL v3 05/20] linux-user: Clear translations on mprotect(), Richard Henderson, 2022/09/06
- [PULL v3 06/20] tests/tcg/i386: Move smc_code2 to an executable section, Richard Henderson, 2022/09/06
- [PULL v3 08/20] accel/tcg: Properly implement get_page_addr_code for user-only, Richard Henderson, 2022/09/06
- [PULL v3 04/20] linux-user: Honor PT_GNU_STACK, Richard Henderson, 2022/09/06
- [PULL v3 01/20] linux-user/arm: Mark the commpage executable, Richard Henderson, 2022/09/06
- [PULL v3 09/20] accel/tcg: Unlock mmap_lock after longjmp, Richard Henderson, 2022/09/06
- [PULL v3 07/20] accel/tcg: Introduce is_same_page(),
Richard Henderson <=
- [PULL v3 11/20] accel/tcg: Move qemu_ram_addr_from_host_nofail to physmem.c, Richard Henderson, 2022/09/06
- [PULL v3 10/20] accel/tcg: Make tb_htable_lookup static, Richard Henderson, 2022/09/06
- [PULL v3 12/20] accel/tcg: Use probe_access_internal for softmmu get_page_addr_code_hostp, Richard Henderson, 2022/09/06
- [PULL v3 13/20] accel/tcg: Document the faulting lookup in tb_lookup_cmp, Richard Henderson, 2022/09/06
- [PULL v3 14/20] accel/tcg: Remove translator_ldsw, Richard Henderson, 2022/09/06
- [PULL v3 16/20] accel/tcg: Add fast path for translator_ld*, Richard Henderson, 2022/09/06
- [PULL v3 15/20] accel/tcg: Add pc and host_pc params to gen_intermediate_code, Richard Henderson, 2022/09/06
- [PULL v3 17/20] target/s390x: Make translator stop before the end of a page, Richard Henderson, 2022/09/06
- [PULL v3 19/20] target/riscv: Add MAX_INSN_LEN and insn_len, Richard Henderson, 2022/09/06
- [PULL v3 20/20] target/riscv: Make translator stop before the end of a page, Richard Henderson, 2022/09/06