109 lines
3.5 KiB
ArmAsm
109 lines
3.5 KiB
ArmAsm
/*
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* Copyright (c) 2012-2014 ARM Ltd
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the company may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Wrapper for the various implementations of strcmp. */
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#include "arm_asm.h"
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#ifdef __ARM_BIG_ENDIAN
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#define S2LO lsl
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#define S2LOEQ lsleq
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#define S2HI lsr
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#define MSB 0x000000ff
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#define LSB 0xff000000
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#define BYTE0_OFFSET 24
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#define BYTE1_OFFSET 16
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#define BYTE2_OFFSET 8
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#define BYTE3_OFFSET 0
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#else /* not __ARM_BIG_ENDIAN */
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#define S2LO lsr
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#define S2LOEQ lsreq
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#define S2HI lsl
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#define BYTE0_OFFSET 0
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#define BYTE1_OFFSET 8
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#define BYTE2_OFFSET 16
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#define BYTE3_OFFSET 24
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#define MSB 0xff000000
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#define LSB 0x000000ff
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#endif /* not __ARM_BIG_ENDIAN */
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.macro def_fn f p2align=0
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.text
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.p2align \p2align
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.global \f
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.type \f, %function
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\f:
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.endm
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#if defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED) \
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|| (__ARM_ARCH == 6 && __ARM_ARCH_PROFILE == 'M')
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# if defined (__thumb__) && !defined (__thumb2__)
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/* Thumb1 only variant. If size is preferred, use strcmp-armv4t.S.
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If speed is preferred, the strcmp function in ../../string/strcmp.c
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will be used. */
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# if defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED)
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# include "strcmp-armv4t.S"
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# else
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/* Leave this field blank. So the strcmp() is not defined, and this will
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automatically pull in the default C definition of strcmp() from
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../../string/strcmp.c. No need to include this file explicitely.
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The lib_a-strcmp.o will not be generated, so it won't replace the
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default lib_a-strcmp.o which is generated by ../../string/strcmp.c.
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See the commands in configure.in and Makefile.am for more details.
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However, if we need to rewrite this function to be more efficient,
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we can add the corresponding assembly code into this field and
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change the commands in configure.in and Makefile.am to allow the
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corresponding lib_a-strcmp.o to be generated.
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*/
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# endif
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# else
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# include "strcmp-arm-tiny.S"
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# endif
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#elif __ARM_ARCH >= 7
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# ifdef __ARM_FEATURE_SIMD32
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# include "strcmp-armv7.S"
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# else
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# include "strcmp-armv7m.S"
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# endif
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#elif __ARM_ARCH >= 6
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# include "strcmp-armv6.S"
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#else
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# include "strcmp-armv4.S"
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#endif
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