| 1 | /* |
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| 2 | * Copyright (c) 2012-2014 ARM Ltd |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. The name of the company may not be used to endorse or promote |
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| 14 | * products derived from this software without specific prior written |
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| 15 | * permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 21 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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| 22 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 23 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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| 24 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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| 25 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 26 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |
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| 29 | /* This version is only used when we want a very basic Thumb1 |
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| 30 | implementation or for size, otherwise we use the base ARMv4 |
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| 31 | version. This is also suitable for ARMv6-M. */ |
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| 32 | |
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| 33 | .thumb |
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| 34 | .syntax unified |
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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 | def_fn strcmp |
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| 39 | .cfi_sections .debug_frame |
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| 40 | .cfi_startproc |
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| 41 | 1: |
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| 42 | ldrb r2, [r0] |
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| 43 | ldrb r3, [r1] |
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| 44 | cmp r2, #0 |
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| 45 | beq 2f |
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| 46 | adds r0, r0, #1 |
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| 47 | adds r1, r1, #1 |
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| 48 | cmp r2, r3 |
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| 49 | beq 1b |
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| 50 | 2: |
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| 51 | subs r0, r2, r3 |
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| 52 | bx lr |
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| 53 | .cfi_endproc |
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| 54 | .size strcmp, . - strcmp |
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