603c87977f
kasan does not instrument the assembly function, so it is checked in advance before calling. If Kasan is not turned on, the speed and space will be almost unchanged under compiler optimization. Signed-off-by: anjiahao <anjiahao@xiaomi.com>
72 lines
2.2 KiB
ArmAsm
72 lines
2.2 KiB
ArmAsm
/****************************************************************************
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* libs/libc/machine/arm/armv7-a/gnu/arch_memmove.S
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*
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* SPDX-License-Identifier: BSD-3-Clause
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* SPDX-FileCopyrightText: 2015 ARM Ltd
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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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****************************************************************************/
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#include "libc.h"
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#ifdef LIBC_BUILD_MEMMOVE
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.thumb
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.syntax unified
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.global ARCH_LIBCFUN(memmove)
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.type ARCH_LIBCFUN(memmove), %function
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ARCH_LIBCFUN(memmove):
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cmp r0, r1
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push {r4}
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bls 3f
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adds r3, r1, r2
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cmp r0, r3
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bcs 3f
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adds r1, r0, r2
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cbz r2, 2f
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subs r2, r3, r2
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1:
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ldrb r4, [r3, #-1]!
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cmp r2, r3
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strb r4, [r1, #-1]!
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bne 1b
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2:
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pop {r4}
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bx lr
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3:
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cmp r2, #0
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beq 2b
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add r2, r2, r1
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subs r3, r0, #1
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4:
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ldrb r4, [r1], #1
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cmp r2, r1
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strb r4, [r3, #1]!
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bne 4b
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pop {r4}
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bx lr
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.size ARCH_LIBCFUN(memmove), . - ARCH_LIBCFUN(memmove)
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#endif
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