1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 1992 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27! .seg "data" 28! .asciz ident "%Z%%M% %I% %E% SMI" 29 .seg ".text" 30 31 .file "ffs.s" 32 33#include <sun4/asm_linkage.h> 34 35 ENTRY(ffs) 36 tst %o0 ! if zero, done 37 bz 2f 38 clr %o1 ! delay slot, return zero if no bit set 391: 40 inc %o1 ! bit that will get checked 41 btst 1, %o0 42 be 1b ! if bit is zero, keep checking 43 srl %o0, 1, %o0 ! shift input right until we hit a 1 bit 442: 45 retl 46 mov %o1, %o0 ! return value is in o1 47 SET_SIZE(ffs) 48