Add __clone() for sh3.

lib/libc/arch/sh3/sys/__clone.S

@@ -0,0 +1,80 @@
+/*	$NetBSD: __clone.S,v 1.1 2001/07/22 17:18:25 tsubai Exp $	*/
+
+/*-
+ * Copyright (c) 2001 Tsubai Masanari.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/errno.h>
+#include "SYS.h"
+
+#ifdef WEAK_ALIAS
+WEAK_ALIAS(clone,__clone)
+#endif
+
+/*
+ * int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
+ */
+ENTRY(__clone)
+	/*
+	 * Sanity checks: func and stack may not be NULL.
+	 */
+	tst	r4, r4
+	bt	inval
+	tst	r5, r5
+	bt	inval
+
+	mov	r4, r2
+	mov	r6, r4
+	mov.l	LSYS___clone, r0
+	trapa	#0x80
+	bf	err
+
+	tst	r0, r0
+	bf	1f		/* We're the parent, just return. */
+
+	jsr	@r2		/* Call the clone's entry point. */
+	mov	r7, r4		/* arg */
+
+	mov.l	L__exit, r1
+	jsr	@r1
+	mov	r0, r4
+
+inval:
+	mov	#EINVAL, r0
+err:
+	mov.l	Lcerror, r1
+	jmp	@r1
+	nop
+1:
+	rts
+	nop
+
+	.align	2
+LSYS___clone:
+	.long	SYS___clone
+L__exit:
+	.long	_C_LABEL(_exit)
+Lcerror:
+	.long	cerror