Create os-syscall.h. The purpose of this file is to define anything
that's different among the BSDs, like system call numbers and
time_t. While there's a lot more different between the BSDs, this is at
least a start at capturing it.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/freebsd/os-syscall.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 bsd-user/freebsd/os-syscall.h

diff --git a/bsd-user/freebsd/os-syscall.h b/bsd-user/freebsd/os-syscall.h
new file mode 100644
index 0000000000..962adfa91a
--- /dev/null
+++ b/bsd-user/freebsd/os-syscall.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2023 Warner Losh <imp@bsdimp.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * OS-Specific portion of syscall_defs.h
+ */
+
+#include "syscall_nr.h"
+
+/*
+ * FreeBSD uses a 64bits time_t except on i386 so we have to add a special case
+ * here.
+ */
+#if defined(TARGET_I386) && !defined(TARGET_X86_64)
+typedef int32_t target_time_t;
+#else
+typedef int64_t target_time_t;
+#endif
+
+typedef abi_long target_suseconds_t;
-- 
2.52.0