| 1 | /* Copyright (c) 2015 ARM Ltd. |
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| 2 | All rights reserved. |
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| 3 | |
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| 4 | Redistribution and use in source and binary forms, with or without |
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| 5 | modification, are permitted provided that the following conditions are met: |
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| 6 | * Redistributions of source code must retain the above copyright |
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| 7 | notice, this list of conditions and the following disclaimer. |
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| 8 | * Redistributions in binary form must reproduce the above copyright |
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| 9 | notice, this list of conditions and the following disclaimer in the |
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| 10 | documentation and/or other materials provided with the distribution. |
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| 11 | * Neither the name of the Linaro nor the |
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| 12 | names of its contributors may be used to endorse or promote products |
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| 13 | derived from this software without specific prior written permission. |
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| 14 | |
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| 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 16 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 17 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 18 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 19 | HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 21 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 22 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 23 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 24 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 25 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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| 26 | |
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| 27 | .macro def_fn f p2align=0 |
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| 28 | .text |
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| 29 | .p2align \p2align |
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| 30 | .global \f |
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| 31 | .type \f, %function |
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| 32 | \f: |
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| 33 | .endm |
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| 34 | |
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| 35 | .arch armv4t |
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| 36 | .eabi_attribute Tag_also_compatible_with, "\006\013" /* ARMv6-M. */ |
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| 37 | .eabi_attribute Tag_ARM_ISA_use, 0 |
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| 38 | .thumb |
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| 39 | .syntax unified |
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| 40 | |
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| 41 | def_fn strlen p2align=1 |
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| 42 | movs r3, #0 |
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| 43 | 1: |
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| 44 | ldrb r2, [r0, r3] |
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| 45 | adds r3, r3, #1 |
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| 46 | cmp r2, #0 |
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| 47 | bne 1b |
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| 48 | subs r0, r3, #1 |
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| 49 | bx lr |
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| 50 | .size strlen, . - strlen |
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