1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Donn Seeley at UUNET Technologies, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if defined(LIBC_SCCS) && !defined(lint) 34 /* .asciz "@(#)udiv.s 8.1 (Berkeley) 6/4/93" */ 35 .asciz "$NetBSD: udiv.S,v 1.2 2005/12/24 08:33:32 matt Exp $" 36#endif /* LIBC_SCCS and not lint */ 37 38/* 39 * Unsigned division, PCC flavor. 40 * udiv() takes an ordinary dividend/divisor pair; 41 * audiv() takes a pointer to a dividend and an ordinary divisor. 42 */ 43 44#include <machine/asm.h> 45 46#define DIVIDEND 4(%ap) 47#define DIVISOR 8(%ap) 48 49#ifdef __ELF__ 50ASENTRY(__udiv,0) 51#else 52ASENTRY(udiv,0) 53#endif 54 movl DIVISOR,%r2 55 jlss Leasy # big divisor: settle by comparison 56 movl DIVIDEND,%r0 57 jlss Lhard # big dividend: extended division 58 divl2 %r2,%r0 # small divisor and dividend: signed division 59 ret 60Lhard: 61 clrl %r1 62 ediv %r2,%r0,%r0,%r1 63 ret 64Leasy: 65 cmpl DIVIDEND,%r2 66 jgequ Lone # if dividend is as big or bigger, return 1 67 clrl %r0 # else return 0 68 ret 69Lone: 70 movl $1,%r0 71 ret 72 73#ifdef __ELF__ 74ASENTRY(__audiv,0) 75#else 76ASENTRY(audiv,0) 77#endif 78 movl DIVIDEND,%r3 79 movl DIVISOR,%r2 80 jlss La_easy # big divisor: settle by comparison 81 movl (%r3),%r0 82 jlss La_hard # big dividend: extended division 83 divl2 %r2,%r0 # small divisor and dividend: signed division 84 movl %r0,(%r3) # leave the value of the assignment in %r0 85 ret 86La_hard: 87 clrl %r1 88 ediv %r2,%r0,%r0,%r1 89 movl %r0,(%r3) 90 ret 91La_easy: 92 cmpl (%r3),%r2 93 jgequ La_one # if dividend is as big or bigger, return 1 94 clrl %r0 # else return 0 95 clrl (%r3) 96 ret 97La_one: 98 movl $1,%r0 99 movl %r0,(%r3) 100 ret 101