1*0Sstevel@tonic-gate/* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate/* 23*0Sstevel@tonic-gate * Copyright 1992 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate! .seg "data" 28*0Sstevel@tonic-gate! .asciz ident "%Z%%M% %I% %E% SMI" 29*0Sstevel@tonic-gate .seg ".text" 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate .file "ffs.s" 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate#include <sun4/asm_linkage.h> 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate ENTRY(ffs) 36*0Sstevel@tonic-gate tst %o0 ! if zero, done 37*0Sstevel@tonic-gate bz 2f 38*0Sstevel@tonic-gate clr %o1 ! delay slot, return zero if no bit set 39*0Sstevel@tonic-gate1: 40*0Sstevel@tonic-gate inc %o1 ! bit that will get checked 41*0Sstevel@tonic-gate btst 1, %o0 42*0Sstevel@tonic-gate be 1b ! if bit is zero, keep checking 43*0Sstevel@tonic-gate srl %o0, 1, %o0 ! shift input right until we hit a 1 bit 44*0Sstevel@tonic-gate2: 45*0Sstevel@tonic-gate retl 46*0Sstevel@tonic-gate mov %o1, %o0 ! return value is in o1 47*0Sstevel@tonic-gate SET_SIZE(ffs) 48