1/* 2 * Copyright (c) 1993 Winning Strategies, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Winning Strategies, Inc. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <machine/asm.h> 32/* 33 * strcpy (dst, src) 34 * copy the string src to dst. 35 * 36 * Written by: 37 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 38 */ 39 40/* 41 * I've unrolled the loop eight times: large enough to make a 42 * significant difference, and small enough not to totally trash the 43 * cache. 44 */ 45 46ENTRY(strcpy) 47 movl 4(%esp),%ecx /* dst address */ 48 movl 8(%esp),%edx /* src address */ 49 pushl %ecx /* push dst address */ 50 51 .align 2,0x90 52L1: movb (%edx),%al /* unroll loop, but not too much */ 53 movb %al,(%ecx) 54 testb %al,%al 55 je L2 56 movb 1(%edx),%al 57 movb %al,1(%ecx) 58 testb %al,%al 59 je L2 60 movb 2(%edx),%al 61 movb %al,2(%ecx) 62 testb %al,%al 63 je L2 64 movb 3(%edx),%al 65 movb %al,3(%ecx) 66 testb %al,%al 67 je L2 68 movb 4(%edx),%al 69 movb %al,4(%ecx) 70 testb %al,%al 71 je L2 72 movb 5(%edx),%al 73 movb %al,5(%ecx) 74 testb %al,%al 75 je L2 76 movb 6(%edx),%al 77 movb %al,6(%ecx) 78 testb %al,%al 79 je L2 80 movb 7(%edx),%al 81 movb %al,7(%ecx) 82 addl $8,%edx 83 addl $8,%ecx 84 testb %al,%al 85 jne L1 86L2: popl %eax /* pop dst address */ 87 ret 88END(strcpy) 89 90 .section .note.GNU-stack,"",%progbits 91