1/*
2 * Copyright (c) 2012-2014 ARM Ltd
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. The name of the company may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
22 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29	/* This version is only used when we want a very basic Thumb1
30	   implementation or for size, otherwise we use the base ARMv4
31	   version.  This is also suitable for ARMv6-M.  */
32
33#include <picolibc.h>
34
35	.thumb
36	.syntax unified
37	.arch	armv4t
38	.eabi_attribute Tag_also_compatible_with, "\006\013" /* ARMv6-M.  */
39	.eabi_attribute Tag_ARM_ISA_use, 0
40def_fn strcmp
41	.cfi_sections .debug_frame
42	.cfi_startproc
431:
44	ldrb	r2, [r0]
45	ldrb	r3, [r1]
46	cmp	r2, #0
47	beq	2f
48	adds	r0, r0, #1
49	adds	r1, r1, #1
50	cmp	r2, r3
51	beq	1b
522:
53	subs	r0, r2, r3
54	bx	lr
55	.cfi_endproc
56	.size	strcmp, . - strcmp
57