1/* Copyright (c) 2015 ARM Ltd.
2   All rights reserved.
3
4   Redistribution and use in source and binary forms, with or without
5   modification, are permitted provided that the following conditions are met:
6       * Redistributions of source code must retain the above copyright
7	 notice, this list of conditions and the following disclaimer.
8       * Redistributions in binary form must reproduce the above copyright
9	 notice, this list of conditions and the following disclaimer in the
10	 documentation and/or other materials provided with the distribution.
11       * Neither the name of the Linaro nor the
12	 names of its contributors may be used to endorse or promote products
13	 derived from this software without specific prior written permission.
14
15   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
19   HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  */
26
27#include "arm_asm.h"
28
29	.macro def_fn f p2align=0
30	.text
31	.p2align \p2align
32	.global \f
33	.type \f, %function
34\f:
35	.endm
36#if __ARM_ARCH_PROFILE == 'M' && __ARM_ARCH >= 8
37	/* keep config inherited from -march=.  */
38#elif __ARM_ARCH_ISA_THUMB >= 2 && __ARM_ARCH >= 7
39	.arch   armv7
40#else
41	.arch	armv6t2
42#endif
43	.eabi_attribute Tag_ARM_ISA_use, 0
44	.thumb
45	.syntax unified
46
47def_fn	strlen p2align=1
48	.fnstart
49	.cfi_startproc
50	prologue
51	mov     r3, r0
521:	ldrb    r2, [r3], #1
53	cmp     r2, #0
54	bne	1b
55	subs    r0, r3, r0
56	subs    r0, #1
57	epilogue
58	.cfi_endproc
59	.cantunwind
60	.fnend
61	.size	strlen, . - strlen
62
63#if defined(__linux__) && defined(__ELF__)
64.section .note.GNU-stack,"",%progbits
65#endif
66