From: Laurent Vivier <laurent@vivier.eu>
To: qemu-devel@nongnu.org
Cc: Riku Voipio <riku.voipio@iki.fi>,
Richard Henderson <richard.henderson@linaro.org>,
Laurent Vivier <laurent@vivier.eu>
Subject: [PULL 5/6] linux-user: Add x86_64 vsyscall page to /proc/self/maps
Date: Thu, 26 Mar 2020 08:23:51 +0100 [thread overview]
Message-ID: <20200326072352.2056553-6-laurent@vivier.eu> (raw)
In-Reply-To: <20200326072352.2056553-1-laurent@vivier.eu>
From: Richard Henderson <richard.henderson@linaro.org>
The page isn't (necessarily) present in the host /proc/self/maps,
and even if it might be it isn't present in page_flags, and even
if it was it might not have the same set of page permissions.
The easiest thing to do, particularly when it comes to the
"[vsyscall]" note at the end of line, is to special case it.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200213032223.14643-5-richard.henderson@linaro.org>
[lv: remove trailing space]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/syscall.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 35f414666243..dbdd56e42077 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7144,6 +7144,16 @@ static int open_self_maps(void *cpu_env, int fd)
}
}
+#ifdef TARGET_VSYSCALL_PAGE
+ /*
+ * We only support execution from the vsyscall page.
+ * This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
+ */
+ dprintf(fd, TARGET_FMT_lx "-" TARGET_FMT_lx
+ " --xp 00000000 00:00 0 [vsyscall]\n",
+ TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE);
+#endif
+
free(line);
fclose(fp);
--
2.25.1
next prev parent reply other threads:[~2020-03-26 7:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 7:23 [PULL 0/6] Linux user for 5.0 patches Laurent Vivier
2020-03-26 7:23 ` [PULL 1/6] linux-user, configure: fix (again) syscall_nr.h dependencies cleanup Laurent Vivier
2020-03-26 7:23 ` [PULL 2/6] target/i386: Renumber EXCP_SYSCALL Laurent Vivier
2020-03-26 7:23 ` [PULL 3/6] linux-user/i386: Split out gen_signal Laurent Vivier
2020-03-26 7:23 ` [PULL 4/6] linux-user/i386: Emulate x86_64 vsyscalls Laurent Vivier
2020-03-26 7:23 ` Laurent Vivier [this message]
2020-03-26 7:23 ` [PULL 6/6] linux-user: Flush out implementation of gettimeofday Laurent Vivier
2020-03-26 15:42 ` [PULL 0/6] Linux user for 5.0 patches Peter Maydell
2020-03-26 16:43 ` Laurent Vivier
2020-03-26 21:58 ` Peter Maydell
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