1/* $NetBSD: mulsi3.S,v 1.4 2013/07/16 23:24:18 matt Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <machine/asm.h> 37 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)mulsi3.s 5.1 (Berkeley) 6/7/90") 41#else 42 RCSID("$NetBSD: mulsi3.S,v 1.4 2013/07/16 23:24:18 matt Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46/* int * int */ 47ENTRY(__mulsi3) 48#ifndef __mc68010__ 49 movel 4(%sp),%d0 50 mulsl 8(%sp),%d0 51#else 52| NB: this requires that __udivsi3 preserve %a0 and return 53| the modulus in %d1: 54 movew 6(%sp), %d0 55 movel %d0, %a0 | save B 56 muluw 8(%sp), %d0 | %d0 holds B * C 57 movew 10(%sp), %d1 58 movel %d1, %a1 | save D 59 muluw 4(%sp), %d1 | %d1 holds A * D 60 addw %d1, %d0 | %d0 holds (B * C) + (A * D) 61 swap %d0 62 clrw %d0 | %d0 holds ((B * C) + (A * D)) << 16 63 exg %a0, %d0 | restore B 64 movel %a1, %d1 | restore D 65 muluw %d1, %d0 | %d0 holds B * D 66 addl %a0, %d0 | final result 67#endif /* __mc68010__ */ 68 rts 69END(__mulsi3) 70