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225 lines
6.9 KiB
ArmAsm
225 lines
6.9 KiB
ArmAsm
/* $NetBSD: memset.S,v 1.4 2003/10/14 07:51:45 scw Exp $ */
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/*
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* Copyright 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Steve C. Woodford for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1995 Mark Brinicombe.
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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. 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 Mark Brinicombe.
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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 THE AUTHOR ``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 THE AUTHOR 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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#include <machine/asm.h>
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.syntax unified
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/*
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* memset: Sets a block of memory to the specified value
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*
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* On entry:
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* r0 - dest address
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* r1 - byte to write
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* r2 - number of bytes to write
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*
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* On exit:
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* r0 - dest address
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*/
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#ifdef _BZERO
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/* LINTSTUB: Func: void bzero(void *, size_t) */
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ENTRY(bzero)
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mov r3, #0x00
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#else
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/* LINTSTUB: Func: void *memset(void *, int, size_t) */
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ENTRY(memset)
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and r3, r1, #0xff /* We deal with bytes */
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mov r1, r2
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#endif
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cmp r1, #0x04 /* Do we have less than 4 bytes */
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mov ip, r0
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blt .Lmemset_lessthanfour
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/* Ok first we will word align the address */
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ands r2, ip, #0x03 /* Get the bottom two bits */
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bne .Lmemset_wordunaligned /* The address is not word aligned */
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/* We are now word aligned */
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.Lmemset_wordaligned:
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#ifndef _BZERO
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orr r3, r3, r3, lsl #8 /* Extend value to 16-bits */
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#endif
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tst ip, #0x04 /* Quad-align for armv5e */
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#ifndef _BZERO
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orr r3, r3, r3, lsl #16 /* Extend value to 32-bits */
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#endif
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itt ne
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subne r1, r1, #0x04 /* Quad-align if necessary */
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strne r3, [ip], #0x04
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cmp r1, #0x10
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blt .Lmemset_loop4 /* If less than 16 then use words */
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mov r2, r3 /* Duplicate data */
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cmp r1, #0x80 /* If < 128 then skip the big loop */
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blt .Lmemset_loop32
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/* Do 128 bytes at a time */
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.Lmemset_loop128:
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subs r1, r1, #0x80
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itttt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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itttt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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itttt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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itttt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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bgt .Lmemset_loop128
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it eq
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RETeq /* Zero length so just exit */
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add r1, r1, #0x80 /* Adjust for extra sub */
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/* Do 32 bytes at a time */
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.Lmemset_loop32:
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subs r1, r1, #0x20
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itttt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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bgt .Lmemset_loop32
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it eq
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RETeq /* Zero length so just exit */
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adds r1, r1, #0x10 /* Partially adjust for extra sub */
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/* Deal with 16 bytes or more */
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itt ge
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strdge r2, [ip], #0x08
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strdge r2, [ip], #0x08
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it eq
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RETeq /* Zero length so just exit */
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it lt
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addlt r1, r1, #0x10 /* Possibly adjust for extra sub */
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/* We have at least 4 bytes so copy as words */
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.Lmemset_loop4:
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subs r1, r1, #0x04
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it ge
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strge r3, [ip], #0x04
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bgt .Lmemset_loop4
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it eq
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RETeq /* Zero length so just exit */
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/* Compensate for 64-bit alignment check */
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adds r1, r1, #0x04
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it eq
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RETeq
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cmp r1, #2
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strb r3, [ip], #0x01 /* Set 1 byte */
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it ge
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strbge r3, [ip], #0x01 /* Set another byte */
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it gt
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strbgt r3, [ip] /* and a third */
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RET /* Exit */
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.Lmemset_wordunaligned:
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rsb r2, r2, #0x004
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strb r3, [ip], #0x01 /* Set 1 byte */
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cmp r2, #0x02
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it ge
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strbge r3, [ip], #0x01 /* Set another byte */
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sub r1, r1, r2
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it gt
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strbgt r3, [ip], #0x01 /* and a third */
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cmp r1, #0x04 /* More than 4 bytes left? */
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it ge
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bge .Lmemset_wordaligned /* Yup */
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.Lmemset_lessthanfour:
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cmp r1, #0x00
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it eq
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RETeq /* Zero length so exit */
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strb r3, [ip], #0x01 /* Set 1 byte */
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cmp r1, #0x02
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it ge
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strbge r3, [ip], #0x01 /* Set another byte */
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it gt
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strbgt r3, [ip] /* and a third */
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RET /* Exit */
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#ifdef _BZERO
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END(bzero)
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#else
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END(memset)
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#endif
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.section .note.GNU-stack,"",%progbits
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