1996-06-04 01:21:29 +04:00
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/* $NetBSD: memcpy.S,v 1.2 1996/06/03 21:24:56 mark Exp $ */
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1996-02-01 02:14:53 +03:00
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/*
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* Copyright (c) 1995 Mark Brinicombe.
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* Copyright (c) 1995 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* memset.S
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*
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* optimized memset function
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*
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* Created : 16/05/95
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*/
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sp .req r13
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lr .req r14
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pc .req r15
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.text
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.global _bcopy
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.global _ovbcopy
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_bcopy:
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_ovbcopy:
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teq r2, #0x00000000
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moveq r0, #0x00000000
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moveq pc, lr
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cmp r0, r1
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blt bcopy_back
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bcopy_loop:
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ldrb r3, [r0], #0x0001
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strb r3, [r1], #0x0001
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subs r2, r2, #0x00000001
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bne bcopy_loop
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mov pc, r14
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bcopy_back:
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add r0, r0, r2
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add r1, r1, r2
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bcopy_bloop:
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ldrb r3, [r0, #-0x0001]!
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strb r3, [r1, #-0x0001]!
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subs r2, r2, #0x00000001
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bne bcopy_bloop
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mov pc, r14
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.global _memcpy
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_memcpy:
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teq r2, #0x00000000
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moveq r0, #0x00000000
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moveq pc, lr
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cmp r1, r0
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blt memcpy_back
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memcpy_loop:
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ldrb r3, [r1], #0x0001
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strb r3, [r0], #0x0001
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subs r2, r2, #0x00000001
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bne memcpy_loop
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mov pc, r14
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memcpy_back:
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add r0, r0, r2
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add r1, r1, r2
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memcpy_bloop:
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ldrb r3, [r1, #-0x0001]!
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strb r3, [r0, #-0x0001]!
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subs r2, r2, #0x00000001
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bne memcpy_bloop
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mov pc, r14
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