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.hender...@linaro.org>
---
linux-user/syscall.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 171c0caef3..eb867a5296 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7005,6 +7005,15 @@ static int open_self_maps(void *cpu_env, int fd)
}
}
+#ifdef TARGET_X86_64
+ /*
+ * We only support execution from the vsyscall page.
+ * This is as if CONFIG_LEGACY_VSYSCALL_XONLY=y from v5.3.
+ */
+ dprintf(fd, "ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0"
+ " [vsyscall]\n");
+#endif
+
free(line);
fclose(fp);
--
2.20.1
