bsd-user: Add host_to_target_uuid for uuidgen(2)

Add host_to_target_uuid() to convert host struct uuid to target ABI
for the uuidgen(2) syscall.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>

bsd-user/bsd-misc.c

@@ -0,0 +1,35 @@
+/*
+ * BSD misc system call conversions routines
+ *
+ * Copyright (c) 2013 Stacey D. Son
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include "qemu/osdep.h"
+
+#include <sys/uuid.h>
+
+#include "qemu.h"
+#include "qemu-bsd.h"
+
+/*
+ * BSD uuidgen(2) struct uuid conversion
+ */
+abi_long host_to_target_uuid(abi_ulong target_addr, struct uuid *host_uuid)
+{
+    struct target_uuid *target_uuid;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_uuid, target_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+    __put_user(host_uuid->time_low, &target_uuid->time_low);
+    __put_user(host_uuid->time_mid, &target_uuid->time_mid);
+    __put_user(host_uuid->time_hi_and_version,
+        &target_uuid->time_hi_and_version);
+    host_uuid->clock_seq_hi_and_reserved =
+        target_uuid->clock_seq_hi_and_reserved;
+    host_uuid->clock_seq_low = target_uuid->clock_seq_low;
+    memcpy(host_uuid->node, target_uuid->node, TARGET_UUID_NODE_LEN);
+    unlock_user_struct(target_uuid, target_addr, 1);
+    return 0;
+}