1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 */ 31/* 32 * Mach Operating System 33 * Copyright (c) 1991,1990 Carnegie Mellon University 34 * All Rights Reserved. 35 * 36 * Permission to use, copy, modify and distribute this software and its 37 * documentation is hereby granted, provided that both the copyright 38 * notice and this permission notice appear in all copies of the 39 * software, derivative works or modified versions, and any portions 40 * thereof, and that both notices appear in supporting documentation. 41 * 42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 43 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 45 * 46 * Carnegie Mellon requests users of this software to return to 47 * 48 * Software Distribution Coordinator or [email protected] 49 * School of Computer Science 50 * Carnegie Mellon University 51 * Pittsburgh PA 15213-3890 52 * 53 * any improvements or extensions that they make and grant Carnegie Mellon 54 * the rights to redistribute these changes. 55 */ 56/* 57 */ 58 59#include <i386/asm.h> 60 61/* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */ 62/* rdi, rsi, rdx */ 63/* 64 * Note: memcpy does not support overlapping copies 65 */ 66ENTRY(memcpy) 67 movq %rdi, %rax /* return destination */ 68 movq %rdx,%rcx 69 cld /* copy forwards */ 70 rep 71 movsb 72 ret 73 74/* void bcopy((const char *) from, (char *) to, (unsigned int) count) */ 75/* rdi, rsi, rdx */ 76 77ENTRY(bcopy_no_overwrite) 78 xchgq %rsi,%rdi 79 jmp EXT(memcpy) 80 81/* 82 * bcopy(src, dst, cnt) 83 * rdi, rsi, rdx 84 * [email protected] (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 85 */ 86ENTRY(bcopy) 87 xchgq %rsi,%rdi 88 jmp EXT(memmove) 89 90/* 91 * memmove(dst, src, cnt) 92 * rdi, rsi, rdx 93 */ 94ENTRY(memmove) 95 movq %rdx,%rcx 96 97 movq %rdi,%rax 98 subq %rsi,%rax 99 cmpq %rcx,%rax /* overlapping && src < dst? */ 100 movq %rdi,%rax /* restore the return value */ 101 jb 1f 102 103 cld /* nope, copy forwards */ 104 rep 105 movsb 106 ret 107 108 /* ALIGN_TEXT */ 1091: 110 addq %rcx,%rdi /* copy backwards */ 111 addq %rcx,%rsi 112 decq %rdi 113 decq %rsi 114 andq $7,%rcx /* any fractional bytes? */ 115 std 116 rep 117 movsb 118 movq %rdx,%rcx /* copy remainder by 32-bit words */ 119 shrq $3,%rcx 120 subq $7,%rsi 121 subq $7,%rdi 122 rep 123 movsq 124 cld 125 ret 126