1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from locore.s. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <machine/asm.h> 37 38#if defined(LIBC_SCCS) 39 RCSID("$NetBSD: bcopy.S,v 1.8 2002/07/10 06:01:51 kent Exp $") 40#endif 41 42 /* 43 * (ov)bcopy (src,dst,cnt) 44 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 45 */ 46 47#ifdef MEMCOPY 48ENTRY(memcpy) 49#else 50#ifdef MEMMOVE 51ENTRY(memmove) 52#else 53ENTRY(bcopy) 54#endif 55#endif 56 pushl %esi 57 pushl %edi 58#if defined(MEMCOPY) || defined(MEMMOVE) 59 movl 12(%esp),%edi 60 movl 16(%esp),%esi 61 movl %edi,%eax /* return value */ 62#else 63 movl 12(%esp),%esi 64 movl 16(%esp),%edi 65#endif 66 movl 20(%esp),%ecx 67 movl %edi,%edx 68 subl %esi,%edx 69 cmpl %ecx,%edx /* overlapping? */ 70 movl %ecx,%edx 71 jb 1f 72 cld /* nope, copy forwards. */ 73 shrl $2,%ecx /* copy by words */ 74 rep 75 movsl 76 movl %edx,%ecx 77 andl $3,%ecx /* any bytes left? */ 78 rep 79 movsb 80 popl %edi 81 popl %esi 82 ret 831: 84 addl %ecx,%edi /* copy backwards. */ 85 addl %ecx,%esi 86 87#ifdef _DIAGNOSTIC 88 /* check pointer wraparound */ 89#if defined(MEMCOPY) || defined(MEMMOVE) 90 cmpl 12(%esp),%edi 91#else 92 cmpl 16(%esp),%edi 93#endif 94 jae 2f 95 pushl $diagmes1 96 pushl $func 97 pushl $__LINE__-4 98 jmp 4f 992: 100#if defined(MEMCOPY) || defined(MEMMOVE) 101 cmpl 16(%esp),%esi 102#else 103 cmpl 12(%esp),%esi 104#endif 105 jae 3f 106 pushl $diagmes2 107 pushl $func 108 pushl $__LINE__-4 1094: 110 pushl $file 111 call _C_LABEL(__diagassert13) 112 addl $16,%esp 113#if defined(MEMCOPY) || defined(MEMMOVE) 114 movl 12(%esp),%eax 115#endif 116 popl %edi 117 popl %esi 118 ret 1193: 120#endif /* _DIAGNOSTIC */ 121 122 std 123 andl $3,%ecx /* any fractional bytes? */ 124 decl %edi 125 decl %esi 126 rep 127 movsb 128 movl %edx,%ecx /* copy remainder by words */ 129 shrl $2,%ecx 130 subl $3,%esi 131 subl $3,%edi 132 rep 133 movsl 134 popl %edi 135 popl %esi 136 cld 137 ret 138 139#ifdef _DIAGNOSTIC 140file: 141 .asciz __FILE__ 142func: 143#if defined(MEMCOPY) 144 .asciz "memcpy" 145#elseif defined(MEMMOVE) 146 .asciz "memmove" 147#else 148 .asciz "bcopy" 149#endif 150diagmes1: 151 .asciz "src + length > src" 152diagmes2: 153 .asciz "dst + length > dst" 154#endif /* _DIAGNOSTIC */ 155