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authorRichard Henderson2020-02-13 04:22:22 +0100
committerLaurent Vivier2020-03-26 08:08:54 +0100
commitbf02adcd888f2837f6accc235a3acf69ca2e82f8 (patch)
treefe0653450e0ff0ae4ba7929c7efefef5dd62e84b /linux-user
parentlinux-user/i386: Emulate x86_64 vsyscalls (diff)
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linux-user: Add x86_64 vsyscall page to /proc/self/maps
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>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 35f4146662..dbdd56e420 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);