common-user: Move safe-syscall.* from linux-user

Move linux-user safe-syscall.S and safe-syscall-error.c to common-user
so that bsd-user can also use it.  Also move safe-syscall.h to
include/user/.  Since there is nothing here that is related to the guest,
as opposed to the host, build it once.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 0 insertions, 25 deletions

diff --git a/linux-user/safe-syscall-error.c b/linux-user/safe-syscall-error.c
deleted file mode 100644
index 55d95ac39a..0000000000
--- a/linux-user/safe-syscall-error.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * safe-syscall-error.c: errno setting fragment
- * This is intended to be invoked by safe-syscall.S
- *
- * Written by Richard Henderson <rth@twiddle.net>
- * Copyright (C) 2021 Red Hat, Inc.
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
- */
-
-#include "qemu/osdep.h"
-#include "safe-syscall.h"
-
-/*
- * This is intended to be invoked via tail-call on the error path
- * from the assembly in host/arch/safe-syscall.inc.S.  This takes
- * care of the host specific addressing of errno.
- * Return -1 to finalize the return value for safe_syscall_base.
- */
-long safe_syscall_set_errno_tail(int value)
-{
-    errno = value;
-    return -1;
-}