/* $NetBSD: bcopy.S,v 1.2 2008/04/28 20:22:52 martin 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. * * 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. 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 1.2 2008/04/28 20:22:52 martin 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 #ifdef __mc68010__ /* * The 68010 cannot access a word or long on an odd boundary, * period. If the source and the destination addresses aren't * of the same evenness, we're forced to do a bytewise copy. */ movl %a0,%d0 addl %a1,%d0 btst #0,%d0 jne Lbcfbyte #endif /* __mc68010__ */ /* 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 #if defined(__SVR4_ABI__) moveal %d0,%a0 #endif #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 #ifdef __mc68010__ /* * The 68010 cannot access a word or long on an odd boundary, * period. If the source and the destination addresses aren't * of the same evenness, we're forced to do a bytewise copy. */ movl %a0,%d0 addl %a1,%d0 btst #0,%d0 jne Lbcbbyte #endif /* __mc68010__ */ /* 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 #if defined(__SVR4_ABI__) moveal %d0,%a0 #endif #endif rts