/* $NetBSD: bcopy.S,v 1.13 1997/05/15 16:07:31 jtc Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by J.T. Conklin. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 RCSID("from: @(#)bcopy.s 5.1 (Berkeley) 5/12/90") #else RCSID("$NetBSD: bcopy.S,v 1.13 1997/05/15 16:07:31 jtc Exp $") #endif #endif /* LIBC_SCCS and not lint */ #ifdef MEMCOPY ENTRY(memcpy) #else #ifdef MEMMOVE ENTRY(memmove) #else ENTRY(bcopy) #endif #endif #if defined(MEMCOPY) || defined(MEMMOVE) movl sp@(4),a1 | dest address movl sp@(8),a0 | src address #else movl sp@(4),a0 | src address movl sp@(8),a1 | dest address #endif movl sp@(12),d1 | count cmpl a1,a0 | src after dest? jlt Lbcback | yes, must copy backwards /* * It isn't worth the overhead of aligning to {long}word boundries * if the string is too short. */ cmpl #8,d1 jlt Lbcfbyte /* word align */ movl a1,d0 btst #0,d0 | if (dst & 1) jeq Lbcfalgndw | movb a0@+,a1@+ | *(char *)dst++ = *(char *) src++ subql #1,d1 | len-- Lbcfalgndw: /* long word align */ btst #1,d0 | if (dst & 2) jeq Lbcfalgndl movw a0@+,a1@+ | *(short *)dst++ = *(short *) dst++ subql #2,d1 | len -= 2 Lbcfalgndl: /* copy by 8 longwords */ movel d1,d0 lsrl #5,d0 | cnt = len / 32 jeq Lbcflong | if (cnt) andl #31,d1 | len %= 32 subql #1,d0 | set up for dbf Lbcf32loop: movl a0@+,a1@+ | copy 8 long words movl a0@+,a1@+ movl a0@+,a1@+ movl a0@+,a1@+ movl a0@+,a1@+ movl a0@+,a1@+ movl a0@+,a1@+ movl a0@+,a1@+ dbf d0,Lbcf32loop | till done clrw d0 subql #1,d0 jcc Lbcf32loop Lbcflong: /* copy by longwords */ movel d1,d0 lsrl #2,d0 | cnt = len / 4 jeq Lbcfbyte | if (cnt) subql #1,d0 | set up for dbf Lbcflloop: movl a0@+,a1@+ | copy longwords dbf d0,Lbcflloop | til done andl #3,d1 | len %= 4 jeq Lbcdone subql #1,d1 | set up for dbf Lbcfbloop: movb a0@+,a1@+ | copy bytes Lbcfbyte: dbf d1,Lbcfbloop | till done Lbcdone: #if defined(MEMCOPY) || defined(MEMMOVE) movl sp@(4),d0 | dest address #endif rts Lbcback: addl d1,a0 | src pointer to end addl d1,a1 | dest pointer to end /* * It isn't worth the overhead of aligning to {long}word boundries * if the string is too short. */ cmpl #8,d1 jlt Lbcbbyte /* word align */ movl a1,d0 btst #0,d0 | if (dst & 1) jeq Lbcbalgndw | movb a0@-,a1@- | *(char *)dst-- = *(char *) src-- subql #1,d1 | len-- Lbcbalgndw: /* long word align */ btst #1,d0 | if (dst & 2) jeq Lbcbalgndl movw a0@-,a1@- | *(short *)dst-- = *(short *) dst-- subql #2,d1 | len -= 2 Lbcbalgndl: /* copy by 8 longwords */ movel d1,d0 lsrl #5,d0 | cnt = len / 32 jeq Lbcblong | if (cnt) andl #31,d1 | len %= 32 subql #1,d0 | set up for dbf Lbcb32loop: movl a0@-,a1@- | copy 8 long words movl a0@-,a1@- movl a0@-,a1@- movl a0@-,a1@- movl a0@-,a1@- movl a0@-,a1@- movl a0@-,a1@- movl a0@-,a1@- dbf d0,Lbcb32loop | till done clrw d0 subql #1,d0 jcc Lbcb32loop Lbcblong: /* copy by longwords */ movel d1,d0 lsrl #2,d0 | cnt = len / 4 jeq Lbcbbyte | if (cnt) subql #1,d0 | set up for dbf Lbcblloop: movl a0@-,a1@- | copy longwords dbf d0,Lbcblloop | til done andl #3,d1 | len %= 4 jeq Lbcdone subql #1,d1 | set up for dbf Lbcbbloop: movb a0@-,a1@- | copy bytes Lbcbbyte: dbf d1,Lbcbbloop | till done #if defined(MEMCOPY) || defined(MEMMOVE) movl sp@(4),d0 | dest address #endif rts