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strcat_naive.S revision 1.1.8.3 
      1  1.1.8.2  tls /*-
      2  1.1.8.2  tls  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      3  1.1.8.2  tls  * All rights reserved.
      4  1.1.8.2  tls  *
      5  1.1.8.2  tls  * This code is derived from software contributed to The NetBSD Foundation
      6  1.1.8.2  tls  * by Matt Thomas of 3am Software Foundry.
      7  1.1.8.2  tls  *
      8  1.1.8.2  tls  * Redistribution and use in source and binary forms, with or without
      9  1.1.8.2  tls  * modification, are permitted provided that the following conditions
     10  1.1.8.2  tls  * are met:
     11  1.1.8.2  tls  * 1. Redistributions of source code must retain the above copyright
     12  1.1.8.2  tls  *    notice, this list of conditions and the following disclaimer.
     13  1.1.8.2  tls  * 2. Redistributions in binary form must reproduce the above copyright
     14  1.1.8.2  tls  *    notice, this list of conditions and the following disclaimer in the
     15  1.1.8.2  tls  *    documentation and/or other materials provided with the distribution.
     16  1.1.8.2  tls  *
     17  1.1.8.2  tls  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  1.1.8.2  tls  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  1.1.8.2  tls  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  1.1.8.2  tls  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  1.1.8.2  tls  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  1.1.8.2  tls  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  1.1.8.2  tls  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  1.1.8.2  tls  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  1.1.8.2  tls  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  1.1.8.2  tls  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  1.1.8.2  tls  * POSSIBILITY OF SUCH DAMAGE.
     28  1.1.8.2  tls  */
     29  1.1.8.2  tls 
     30  1.1.8.2  tls #include <machine/asm.h>
     31  1.1.8.2  tls 
     32  1.1.8.2  tls RCSID("$NetBSD: strcat_naive.S,v 1.1.8.3 2014/08/19 23:45:12 tls Exp $")
     33  1.1.8.2  tls 
     34  1.1.8.2  tls ENTRY(strcat)
     35  1.1.8.2  tls 	mov	ip, r0			/* need to preserve r0 */
     36  1.1.8.3  tls #if defined(__thumb__)
     37  1.1.8.3  tls 1:	ldrb	r2, [r0]		/* load next byte */
     38  1.1.8.3  tls 	adds	r0, r0, #1		/* advance */
     39  1.1.8.3  tls 	cmp	r2, #0			/* was it a NUL? */
     40  1.1.8.3  tls 	bne	1b			/*   no, get next byte */
     41  1.1.8.3  tls 	subs	r0, r0, #1		/* back up one to the NUL */
     42  1.1.8.3  tls 	subs	r1, r1, r0		/* save one increment */
     43  1.1.8.3  tls 2:	ldrb	r2, [r1, r0]		/* load next byte from append */
     44  1.1.8.3  tls 	strb	r2, [r0]		/* store it */
     45  1.1.8.3  tls 	adds	r0, r0, #1		/* advance */
     46  1.1.8.3  tls 	cmp	r2, #0			/* was it a NUL? */
     47  1.1.8.3  tls 	bne	2b			/*   no, get next byte */
     48  1.1.8.3  tls 	mov	r0, ip			/* restore dst address */
     49  1.1.8.3  tls 	RET				/* return */
     50  1.1.8.3  tls #else /* !__thumb__ */
     51  1.1.8.3  tls 	mov	ip, r0			/* need to preserve r0 */
     52  1.1.8.2  tls 1:	ldrb	r2, [ip], #1		/* load next byte */
     53  1.1.8.2  tls 	teq	r2, #0			/* was it a NUL? */
     54  1.1.8.2  tls 	bne	1b			/*   no, get next byte */
     55  1.1.8.2  tls 	sub	ip, ip, #1		/* back up one to the NUL */
     56  1.1.8.2  tls 2:	ldrb	r2, [r1], #1		/* load next byte from append */
     57  1.1.8.2  tls 	strb	r2, [ip], #1		/* store it */
     58  1.1.8.2  tls 	teq	r2, #0			/* was it a NUL? */
     59  1.1.8.2  tls 	bne	2b			/*   no, get next byte */
     60  1.1.8.2  tls 	RET				/* return */
     61  1.1.8.3  tls #endif
     62  1.1.8.2  tls END(strcat)
     63