strcpy.S revision 91999
11849Swollman/* 21849Swollman * Copyright (c) 1993 Winning Strategies, Inc. 31849Swollman * All rights reserved. 41849Swollman * 51849Swollman * Redistribution and use in source and binary forms, with or without 61849Swollman * modification, are permitted provided that the following conditions 71849Swollman * are met: 81849Swollman * 1. Redistributions of source code must retain the above copyright 91849Swollman * notice, this list of conditions and the following disclaimer. 101849Swollman * 2. Redistributions in binary form must reproduce the above copyright 111849Swollman * notice, this list of conditions and the following disclaimer in the 121849Swollman * documentation and/or other materials provided with the distribution. 131849Swollman * 3. All advertising materials mentioning features or use of this software 141849Swollman * must display the following acknowledgement: 151849Swollman * This product includes software developed by Winning Strategies, Inc. 161849Swollman * 4. The name of the author may not be used to endorse or promote products 171849Swollman * derived from this software withough specific prior written permission 181849Swollman * 191849Swollman * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 201849Swollman * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 211849Swollman * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 221849Swollman * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 231849Swollman * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 241849Swollman * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 251849Swollman * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 261849Swollman * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 271849Swollman * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 281849Swollman * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 291849Swollman */ 301849Swollman 311849Swollman#if defined(LIBC_RCS) && !defined(lint) 325790Sdg .text 3350476Speter .asciz "$FreeBSD: head/lib/libc/i386/string/strcpy.S 91999 2002-03-10 12:08:28Z billf $" 341849Swollman#endif /* LIBC_RCS and not lint */ 351849Swollman 3685437Speter#include <machine/asm.h> 371849Swollman 381849Swollman/* 391849Swollman * strcpy (dst, src) 401849Swollman * copy the string src to dst. 411849Swollman * 421849Swollman * Written by: 431849Swollman * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 441849Swollman */ 451849Swollman 461849Swollman/* 471849Swollman * I've unrolled the loop eight times: large enough to make a 481849Swollman * significant difference, and small enough not to totally trash the 4991999Sbillf * cache. 501849Swollman */ 511849Swollman 521849SwollmanENTRY(strcpy) 531849Swollman movl 4(%esp),%ecx /* dst address */ 541849Swollman movl 8(%esp),%edx /* src address */ 551849Swollman pushl %ecx /* push dst address */ 561849Swollman 571849Swollman .align 2,0x90 581849SwollmanL1: movb (%edx),%al /* unroll loop, but not too much */ 591849Swollman movb %al,(%ecx) 601849Swollman testb %al,%al 611849Swollman je L2 621849Swollman movb 1(%edx),%al 631849Swollman movb %al,1(%ecx) 641849Swollman testb %al,%al 651849Swollman je L2 661849Swollman movb 2(%edx),%al 671849Swollman movb %al,2(%ecx) 681849Swollman testb %al,%al 691849Swollman je L2 701849Swollman movb 3(%edx),%al 711849Swollman movb %al,3(%ecx) 721849Swollman testb %al,%al 731849Swollman je L2 741849Swollman movb 4(%edx),%al 751849Swollman movb %al,4(%ecx) 761849Swollman testb %al,%al 771849Swollman je L2 781849Swollman movb 5(%edx),%al 791849Swollman movb %al,5(%ecx) 801849Swollman testb %al,%al 811849Swollman je L2 821849Swollman movb 6(%edx),%al 831849Swollman movb %al,6(%ecx) 841849Swollman testb %al,%al 851849Swollman je L2 861849Swollman movb 7(%edx),%al 871849Swollman movb %al,7(%ecx) 881849Swollman addl $8,%edx 891849Swollman addl $8,%ecx 901849Swollman testb %al,%al 911849Swollman jne L1 921849SwollmanL2: popl %eax /* pop dst address */ 931849Swollman ret 94