bootblock/boot/muldi3.s

1.1  is /*	$NetBSD: muldi3.s,v 1.1 1996/11/29 23:36:30 is Exp $
1.1  is  *
1.1  is  * Copyright (c) 1996 Ignatios Souvatzis
1.1  is  * All rights reserved.
1.1  is  *
1.1  is  * Redistribution and use in source and binary forms, with or without
1.1  is  * modification, are permitted provided that the following conditions
1.1  is  * are met:
1.1  is  * 1. Redistributions of source code must retain the above copyright
1.1  is  *    notice, this list of conditions and the following disclaimer.
1.1  is  * 2. Redistributions in binary form must reproduce the above copyright
1.1  is  *    notice, this list of conditions and the following disclaimer in the
1.1  is  *    documentation and/or other materials provided with the distribution.
1.1  is  * 3. All advertising materials mentioning features or use of this software
1.1  is  *    must display the following acknowledgement:
1.1  is  *      This product includes software developed by Ignatios Souvatzis
1.1  is  *      for the NetBSD project.
1.1  is  * 4. The name of the author may not be used to endorse or promote products
1.1  is  *    derived from this software without specific prior written permission
1.1  is  *
1.1  is  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1.1  is  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1.1  is  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1.1  is  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1.1  is  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1.1  is  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.1  is  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.1  is  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.1  is  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.1  is  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1  is  *
1.1  is  * Slow but small muldi3.
1.1  is  * Beware... the multiplicand is unsigned (but should be enough for
1.1  is  * usage by ufs.c :-)
1.1  is  */
1.1  is
1.1  is 	.text
1.1  is 	.even
1.1  is 	.globl	___muldi3
1.1  is ___muldi3:
1.1  is 	movml d2/d3/d4/d5/d6,sp@-	| 0..4 regs, 5 pc, 6..9 parameters
1.1  is 	movml sp@(24),d2-d5
1.1  is |	movl sp@(24),d2
1.1  is |	movl sp@(28),d3
1.1  is |	movl sp@(32),d4
1.1  is |	movl sp@(36),d5
1.1  is 	movq #0,d0
1.1  is 	movq #0,d1
1.1  is 	movq #63,d6
1.1  is L4:
1.1  is 	asrl #1,d2
1.1  is 	roxrl #1,d3
1.1  is 	jcc L5
1.1  is 	addl d5,d1
1.1  is 	addxl d4,d0
1.1  is L5:
1.1  is 	addl d5,d5
1.1  is 	addxl d4,d4
1.1  is L7:
1.1  is 	dbra d6,L4
1.1  is 	movml sp@+,d2/d3/d4/d5/d6
1.1  is 	rts