Tidy up some memory copying cruft:
bcopy.S is no longer needed memmove and memcpy were both stacking r0 and unstacking it to keep the return value, so push this down into _memcpy. rename _memcpy.S to memcpy.S. memmove.S is now just a placeholder otherwise the make system automagically adds a memmove.c file to libkern. memmove is just another entry point for memcpy.
This commit is contained in:
chris
parent
04d6054972
commit
9cc0f33345
@ -1,4 +1,4 @@
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# $NetBSD: Makefile.inc,v 1.2 2001/07/06 17:35:44 toshii Exp $
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# $NetBSD: Makefile.inc,v 1.3 2001/11/20 00:29:19 chris Exp $
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SRCS+= __assert.c __main.c bswap64.c byte_swap_2.S byte_swap_4.S \
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ffs.c imax.c imin.c lmax.c lmin.c max.c min.c random.c scanc.c \
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@ -7,4 +7,4 @@ SRCS+= __assert.c __main.c bswap64.c byte_swap_2.S byte_swap_4.S \
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strncpy.c strtoul.c ulmax.c ulmin.c
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SRCS+= divsi3.S
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SRCS+= memchr.c memcmp.c _memcpy.S memcpy.S memmove.S memset.S
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SRCS+= memchr.c memcmp.c memcpy.S memset.S memmove.S
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@ -1,481 +0,0 @@
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/* $NetBSD: _memcpy.S,v 1.2 2001/01/23 19:12:29 bjh21 Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Neil A. Carson and 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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS
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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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#include <machine/asm.h>
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/*
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* This is one fun bit of code ...
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* Some easy listening music is suggested while trying to understand this
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* code e.g. Iron Maiden
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*
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* For anyone attempting to understand it :
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*
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* The core code is implemented here with simple stubs for memcpy()
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* memmove() and bcopy().
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*
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* All local labels are prefixed with Lmemcpy_
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* Following the prefix a label starting f is used in the forward copy code
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* while a label using b is used in the backwards copy code
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* The source and destination addresses determine whether a forward or
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* backward copy is performed.
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* Separate bits of code are used to deal with the following situations
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* for both the forward and backwards copy.
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* unaligned source address
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* unaligned destination address
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* Separate copy routines are used to produce an optimised result for each
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* of these cases.
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* The copy code will use LDM/STM instructions to copy up to 32 bytes at
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* a time where possible.
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*
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* Note: r12 (aka ip) can be trashed during the function along with
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* r0-r3 although r0-r2 have defined uses i.e. src, dest, len through out.
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* Additional registers are preserved prior to use i.e. r4, r5 & lr
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*
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* Apologies for the state of the comments ;-)
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*/
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ENTRY(_memcpy)
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/* Determine copy direction */
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cmp r1, r0
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bcc Lmemcpy_backwards
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moveq r0, #0 /* Quick abort for len=0 */
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#ifdef __APCS_26__
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moveqs pc, lr
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#else
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moveq pc, lr
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#endif
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stmdb sp!, {r0, lr} /* memcpy() returns dest addr */
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subs r2, r2, #4
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blt Lmemcpy_fl4 /* less than 4 bytes */
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ands r12, r0, #3
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bne Lmemcpy_fdestul /* oh unaligned destination addr */
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ands r12, r1, #3
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bne Lmemcpy_fsrcul /* oh unaligned source addr */
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Lmemcpy_ft8:
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/* We have aligned source and destination */
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subs r2, r2, #8
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blt Lmemcpy_fl12 /* less than 12 bytes (4 from above) */
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subs r2, r2, #0x14
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blt Lmemcpy_fl32 /* less than 32 bytes (12 from above) */
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stmdb sp!, {r4} /* borrow r4 */
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/* blat 32 bytes at a time */
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/* XXX for really big copies perhaps we should use more registers */
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Lmemcpy_floop32:
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ldmia r1!, {r3, r4, r12, lr}
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stmia r0!, {r3, r4, r12, lr}
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ldmia r1!, {r3, r4, r12, lr}
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stmia r0!, {r3, r4, r12, lr}
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subs r2, r2, #0x20
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bge Lmemcpy_floop32
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cmn r2, #0x10
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ldmgeia r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
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stmgeia r0!, {r3, r4, r12, lr}
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subge r2, r2, #0x10
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ldmia sp!, {r4} /* return r4 */
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Lmemcpy_fl32:
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adds r2, r2, #0x14
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/* blat 12 bytes at a time */
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Lmemcpy_floop12:
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ldmgeia r1!, {r3, r12, lr}
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stmgeia r0!, {r3, r12, lr}
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subges r2, r2, #0x0c
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bge Lmemcpy_floop12
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Lmemcpy_fl12:
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adds r2, r2, #8
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blt Lmemcpy_fl4
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subs r2, r2, #4
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ldrlt r3, [r1], #4
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strlt r3, [r0], #4
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ldmgeia r1!, {r3, r12}
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stmgeia r0!, {r3, r12}
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subge r2, r2, #4
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Lmemcpy_fl4:
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/* less than 4 bytes to go */
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adds r2, r2, #4
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ldmeqia sp!, {r0, pc} /* done */
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/* copy the crud byte at a time */
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cmp r2, #2
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ldrb r3, [r1], #1
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strb r3, [r0], #1
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ldrgeb r3, [r1], #1
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strgeb r3, [r0], #1
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ldrgtb r3, [r1], #1
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strgtb r3, [r0], #1
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#ifdef __APCS_26__
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ldmia sp!, {r0, pc}^
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#else
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ldmia sp!, {r0, pc}
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#endif
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/* erg - unaligned destination */
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Lmemcpy_fdestul:
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rsb r12, r12, #4
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cmp r12, #2
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/* align destination with byte copies */
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ldrb r3, [r1], #1
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strb r3, [r0], #1
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ldrgeb r3, [r1], #1
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strgeb r3, [r0], #1
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ldrgtb r3, [r1], #1
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strgtb r3, [r0], #1
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subs r2, r2, r12
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blt Lmemcpy_fl4 /* less the 4 bytes */
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ands r12, r1, #3
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beq Lmemcpy_ft8 /* we have an aligned source */
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/* erg - unaligned source */
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/* This is where it gets nasty ... */
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Lmemcpy_fsrcul:
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bic r1, r1, #3
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ldr lr, [r1], #4
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cmp r12, #2
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bgt Lmemcpy_fsrcul3
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beq Lmemcpy_fsrcul2
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cmp r2, #0x0c
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blt Lmemcpy_fsrcul1loop4
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sub r2, r2, #0x0c
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stmdb sp!, {r4, r5}
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Lmemcpy_fsrcul1loop16:
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mov r3, lr, lsr #8
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ldmia r1!, {r4, r5, r12, lr}
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orr r3, r3, r4, lsl #24
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mov r4, r4, lsr #8
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orr r4, r4, r5, lsl #24
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mov r5, r5, lsr #8
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orr r5, r5, r12, lsl #24
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mov r12, r12, lsr #8
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orr r12, r12, lr, lsl #24
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stmia r0!, {r3-r5, r12}
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subs r2, r2, #0x10
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bge Lmemcpy_fsrcul1loop16
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ldmia sp!, {r4, r5}
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adds r2, r2, #0x0c
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blt Lmemcpy_fsrcul1l4
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Lmemcpy_fsrcul1loop4:
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mov r12, lr, lsr #8
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ldr lr, [r1], #4
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orr r12, r12, lr, lsl #24
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str r12, [r0], #4
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subs r2, r2, #4
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bge Lmemcpy_fsrcul1loop4
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Lmemcpy_fsrcul1l4:
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sub r1, r1, #3
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b Lmemcpy_fl4
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Lmemcpy_fsrcul2:
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cmp r2, #0x0c
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blt Lmemcpy_fsrcul2loop4
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sub r2, r2, #0x0c
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stmdb sp!, {r4, r5}
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Lmemcpy_fsrcul2loop16:
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mov r3, lr, lsr #16
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ldmia r1!, {r4, r5, r12, lr}
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orr r3, r3, r4, lsl #16
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mov r4, r4, lsr #16
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orr r4, r4, r5, lsl #16
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mov r5, r5, lsr #16
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orr r5, r5, r12, lsl #16
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mov r12, r12, lsr #16
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orr r12, r12, lr, lsl #16
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stmia r0!, {r3-r5, r12}
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subs r2, r2, #0x10
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bge Lmemcpy_fsrcul2loop16
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ldmia sp!, {r4, r5}
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adds r2, r2, #0x0c
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blt Lmemcpy_fsrcul2l4
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Lmemcpy_fsrcul2loop4:
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mov r12, lr, lsr #16
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ldr lr, [r1], #4
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orr r12, r12, lr, lsl #16
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str r12, [r0], #4
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subs r2, r2, #4
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bge Lmemcpy_fsrcul2loop4
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Lmemcpy_fsrcul2l4:
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sub r1, r1, #2
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b Lmemcpy_fl4
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Lmemcpy_fsrcul3:
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cmp r2, #0x0c
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blt Lmemcpy_fsrcul3loop4
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sub r2, r2, #0x0c
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stmdb sp!, {r4, r5}
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Lmemcpy_fsrcul3loop16:
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mov r3, lr, lsr #24
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ldmia r1!, {r4, r5, r12, lr}
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orr r3, r3, r4, lsl #8
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mov r4, r4, lsr #24
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orr r4, r4, r5, lsl #8
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mov r5, r5, lsr #24
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orr r5, r5, r12, lsl #8
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mov r12, r12, lsr #24
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orr r12, r12, lr, lsl #8
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stmia r0!, {r3-r5, r12}
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subs r2, r2, #0x10
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bge Lmemcpy_fsrcul3loop16
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ldmia sp!, {r4, r5}
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adds r2, r2, #0x0c
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blt Lmemcpy_fsrcul3l4
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Lmemcpy_fsrcul3loop4:
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mov r12, lr, lsr #24
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ldr lr, [r1], #4
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orr r12, r12, lr, lsl #8
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str r12, [r0], #4
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subs r2, r2, #4
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bge Lmemcpy_fsrcul3loop4
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Lmemcpy_fsrcul3l4:
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sub r1, r1, #1
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b Lmemcpy_fl4
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Lmemcpy_backwards:
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add r1, r1, r2
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add r0, r0, r2
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subs r2, r2, #4
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blt Lmemcpy_bl4 /* less than 4 bytes */
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ands r12, r0, #3
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bne Lmemcpy_bdestul /* oh unaligned destination addr */
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ands r12, r1, #3
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bne Lmemcpy_bsrcul /* oh unaligned source addr */
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Lmemcpy_bt8:
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/* We have aligned source and destination */
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subs r2, r2, #8
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blt Lmemcpy_bl12 /* less than 12 bytes (4 from above) */
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stmdb sp!, {r4, lr}
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subs r2, r2, #0x14 /* less than 32 bytes (12 from above) */
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blt Lmemcpy_bl32
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/* blat 32 bytes at a time */
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/* XXX for really big copies perhaps we should use more registers */
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Lmemcpy_bloop32:
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ldmdb r1!, {r3, r4, r12, lr}
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stmdb r0!, {r3, r4, r12, lr}
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ldmdb r1!, {r3, r4, r12, lr}
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stmdb r0!, {r3, r4, r12, lr}
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subs r2, r2, #0x20
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bge Lmemcpy_bloop32
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Lmemcpy_bl32:
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cmn r2, #0x10
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ldmgedb r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
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stmgedb r0!, {r3, r4, r12, lr}
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subge r2, r2, #0x10
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adds r2, r2, #0x14
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ldmgedb r1!, {r3, r12, lr} /* blat a remaining 12 bytes */
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stmgedb r0!, {r3, r12, lr}
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subge r2, r2, #0x0c
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ldmia sp!, {r4, lr}
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Lmemcpy_bl12:
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adds r2, r2, #8
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blt Lmemcpy_bl4
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subs r2, r2, #4
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ldrlt r3, [r1, #-4]!
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strlt r3, [r0, #-4]!
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ldmgedb r1!, {r3, r12}
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stmgedb r0!, {r3, r12}
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subge r2, r2, #4
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Lmemcpy_bl4:
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/* less than 4 bytes to go */
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adds r2, r2, #4
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moveq pc, lr /* done */
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/* copy the crud byte at a time */
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cmp r2, #2
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ldrb r3, [r1, #-1]!
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strb r3, [r0, #-1]!
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ldrgeb r3, [r1, #-1]!
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strgeb r3, [r0, #-1]!
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ldrgtb r3, [r1, #-1]!
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strgtb r3, [r0, #-1]!
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#ifdef __APCS_26__
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movs pc, lr
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#else
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mov pc, lr
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#endif
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/* erg - unaligned destination */
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Lmemcpy_bdestul:
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cmp r12, #2
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/* align destination with byte copies */
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ldrb r3, [r1, #-1]!
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strb r3, [r0, #-1]!
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ldrgeb r3, [r1, #-1]!
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strgeb r3, [r0, #-1]!
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ldrgtb r3, [r1, #-1]!
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strgtb r3, [r0, #-1]!
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subs r2, r2, r12
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blt Lmemcpy_bl4 /* less than 4 bytes to go */
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ands r12, r1, #3
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beq Lmemcpy_bt8 /* we have an aligned source */
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/* erg - unaligned source */
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/* This is where it gets nasty ... */
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Lmemcpy_bsrcul:
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bic r1, r1, #3
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ldr r3, [r1, #0]
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cmp r12, #2
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blt Lmemcpy_bsrcul1
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beq Lmemcpy_bsrcul2
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cmp r2, #0x0c
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blt Lmemcpy_bsrcul3loop4
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sub r2, r2, #0x0c
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stmdb sp!, {r4, r5, lr}
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Lmemcpy_bsrcul3loop16:
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mov lr, r3, lsl #8
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ldmdb r1!, {r3-r5, r12}
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orr lr, lr, r12, lsr #24
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mov r12, r12, lsl #8
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orr r12, r12, r5, lsr #24
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mov r5, r5, lsl #8
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orr r5, r5, r4, lsr #24
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mov r4, r4, lsl #8
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orr r4, r4, r3, lsr #24
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stmdb r0!, {r4, r5, r12, lr}
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subs r2, r2, #0x10
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bge Lmemcpy_bsrcul3loop16
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ldmia sp!, {r4, r5, lr}
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adds r2, r2, #0x0c
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blt Lmemcpy_bsrcul3l4
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Lmemcpy_bsrcul3loop4:
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mov r12, r3, lsl #8
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ldr r3, [r1, #-4]!
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orr r12, r12, r3, lsr #24
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str r12, [r0, #-4]!
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subs r2, r2, #4
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bge Lmemcpy_bsrcul3loop4
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Lmemcpy_bsrcul3l4:
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add r1, r1, #3
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b Lmemcpy_bl4
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|
||||
Lmemcpy_bsrcul2:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_bsrcul2loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5, lr}
|
||||
|
||||
Lmemcpy_bsrcul2loop16:
|
||||
mov lr, r3, lsl #16
|
||||
ldmdb r1!, {r3-r5, r12}
|
||||
orr lr, lr, r12, lsr #16
|
||||
mov r12, r12, lsl #16
|
||||
orr r12, r12, r5, lsr #16
|
||||
mov r5, r5, lsl #16
|
||||
orr r5, r5, r4, lsr #16
|
||||
mov r4, r4, lsl #16
|
||||
orr r4, r4, r3, lsr #16
|
||||
stmdb r0!, {r4, r5, r12, lr}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_bsrcul2loop16
|
||||
ldmia sp!, {r4, r5, lr}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_bsrcul2l4
|
||||
|
||||
Lmemcpy_bsrcul2loop4:
|
||||
mov r12, r3, lsl #16
|
||||
ldr r3, [r1, #-4]!
|
||||
orr r12, r12, r3, lsr #16
|
||||
str r12, [r0, #-4]!
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_bsrcul2loop4
|
||||
|
||||
Lmemcpy_bsrcul2l4:
|
||||
add r1, r1, #2
|
||||
b Lmemcpy_bl4
|
||||
|
||||
Lmemcpy_bsrcul1:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_bsrcul1loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5, lr}
|
||||
|
||||
Lmemcpy_bsrcul1loop32:
|
||||
mov lr, r3, lsl #24
|
||||
ldmdb r1!, {r3-r5, r12}
|
||||
orr lr, lr, r12, lsr #8
|
||||
mov r12, r12, lsl #24
|
||||
orr r12, r12, r5, lsr #8
|
||||
mov r5, r5, lsl #24
|
||||
orr r5, r5, r4, lsr #8
|
||||
mov r4, r4, lsl #24
|
||||
orr r4, r4, r3, lsr #8
|
||||
stmdb r0!, {r4, r5, r12, lr}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_bsrcul1loop32
|
||||
ldmia sp!, {r4, r5, lr}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_bsrcul1l4
|
||||
|
||||
Lmemcpy_bsrcul1loop4:
|
||||
mov r12, r3, lsl #24
|
||||
ldr r3, [r1, #-4]!
|
||||
orr r12, r12, r3, lsr #8
|
||||
str r12, [r0, #-4]!
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_bsrcul1loop4
|
||||
|
||||
Lmemcpy_bsrcul1l4:
|
||||
add r1, r1, #1
|
||||
b Lmemcpy_bl4
|
||||
|
||||
@ -1,48 +0,0 @@
|
||||
/* $NetBSD: bcopy.S,v 1.1 2000/12/29 20:51:56 bjh21 Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1997 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to The NetBSD Foundation
|
||||
* by Neil A. Carson and Mark Brinicombe
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||||
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||||
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <machine/asm.h>
|
||||
|
||||
/* bcopy = memcpy/memmove with arguments reversed. */
|
||||
|
||||
ENTRY(bcopy)
|
||||
/* switch the source and destination registers */
|
||||
eor r0, r1, r0
|
||||
eor r1, r0, r1
|
||||
eor r0, r1, r0
|
||||
b _C_LABEL(_memcpy)
|
||||
@ -1,4 +1,4 @@
|
||||
/* $NetBSD: memcpy.S,v 1.1 2000/12/29 20:51:57 bjh21 Exp $ */
|
||||
/* $NetBSD: memcpy.S,v 1.2 2001/11/20 00:29:20 chris Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1997 The NetBSD Foundation, Inc.
|
||||
@ -17,8 +17,8 @@
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
@ -38,11 +38,456 @@
|
||||
|
||||
#include <machine/asm.h>
|
||||
|
||||
/*
|
||||
* This is one fun bit of code ...
|
||||
* Some easy listening music is suggested while trying to understand this
|
||||
* code e.g. Iron Maiden
|
||||
*
|
||||
* For anyone attempting to understand it :
|
||||
*
|
||||
* The core code is implemented here with simple stubs for memcpy()
|
||||
* memmove() and bcopy().
|
||||
*
|
||||
* All local labels are prefixed with Lmemcpy_
|
||||
* Following the prefix a label starting f is used in the forward copy code
|
||||
* while a label using b is used in the backwards copy code
|
||||
* The source and destination addresses determine whether a forward or
|
||||
* backward copy is performed.
|
||||
* Separate bits of code are used to deal with the following situations
|
||||
* for both the forward and backwards copy.
|
||||
* unaligned source address
|
||||
* unaligned destination address
|
||||
* Separate copy routines are used to produce an optimised result for each
|
||||
* of these cases.
|
||||
* The copy code will use LDM/STM instructions to copy up to 32 bytes at
|
||||
* a time where possible.
|
||||
*
|
||||
* Note: r12 (aka ip) can be trashed during the function along with
|
||||
* r0-r3 although r0-r2 have defined uses i.e. src, dest, len through out.
|
||||
* Additional registers are preserved prior to use i.e. r4, r5 & lr
|
||||
*
|
||||
* Apologies for the state of the comments ;-)
|
||||
*/
|
||||
|
||||
ENTRY(memcpy)
|
||||
stmfd sp!, {r0, lr}
|
||||
bl _C_LABEL(_memcpy)
|
||||
ENTRY_NP(memmove)
|
||||
/* Determine copy direction */
|
||||
cmp r1, r0
|
||||
|
||||
moveq r0, #0 /* Quick abort for len=0 */
|
||||
#ifdef __APCS_26__
|
||||
ldmfd sp!, {r0, pc}^
|
||||
moveqs pc, lr
|
||||
#else
|
||||
ldmfd sp!, {r0, pc}
|
||||
moveq pc, lr
|
||||
#endif
|
||||
|
||||
/* save leaf functions having to store this away */
|
||||
stmdb sp!, {r0, lr} /* memcpy() returns dest addr */
|
||||
|
||||
bcc Lmemcpy_backwards
|
||||
|
||||
/* start of forwards copy */
|
||||
subs r2, r2, #4
|
||||
blt Lmemcpy_fl4 /* less than 4 bytes */
|
||||
ands r12, r0, #3
|
||||
bne Lmemcpy_fdestul /* oh unaligned destination addr */
|
||||
ands r12, r1, #3
|
||||
bne Lmemcpy_fsrcul /* oh unaligned source addr */
|
||||
|
||||
Lmemcpy_ft8:
|
||||
/* We have aligned source and destination */
|
||||
subs r2, r2, #8
|
||||
blt Lmemcpy_fl12 /* less than 12 bytes (4 from above) */
|
||||
subs r2, r2, #0x14
|
||||
blt Lmemcpy_fl32 /* less than 32 bytes (12 from above) */
|
||||
stmdb sp!, {r4} /* borrow r4 */
|
||||
|
||||
/* blat 32 bytes at a time */
|
||||
/* XXX for really big copies perhaps we should use more registers */
|
||||
Lmemcpy_floop32:
|
||||
ldmia r1!, {r3, r4, r12, lr}
|
||||
stmia r0!, {r3, r4, r12, lr}
|
||||
ldmia r1!, {r3, r4, r12, lr}
|
||||
stmia r0!, {r3, r4, r12, lr}
|
||||
subs r2, r2, #0x20
|
||||
bge Lmemcpy_floop32
|
||||
|
||||
cmn r2, #0x10
|
||||
ldmgeia r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
|
||||
stmgeia r0!, {r3, r4, r12, lr}
|
||||
subge r2, r2, #0x10
|
||||
ldmia sp!, {r4} /* return r4 */
|
||||
|
||||
Lmemcpy_fl32:
|
||||
adds r2, r2, #0x14
|
||||
|
||||
/* blat 12 bytes at a time */
|
||||
Lmemcpy_floop12:
|
||||
ldmgeia r1!, {r3, r12, lr}
|
||||
stmgeia r0!, {r3, r12, lr}
|
||||
subges r2, r2, #0x0c
|
||||
bge Lmemcpy_floop12
|
||||
|
||||
Lmemcpy_fl12:
|
||||
adds r2, r2, #8
|
||||
blt Lmemcpy_fl4
|
||||
|
||||
subs r2, r2, #4
|
||||
ldrlt r3, [r1], #4
|
||||
strlt r3, [r0], #4
|
||||
ldmgeia r1!, {r3, r12}
|
||||
stmgeia r0!, {r3, r12}
|
||||
subge r2, r2, #4
|
||||
|
||||
Lmemcpy_fl4:
|
||||
/* less than 4 bytes to go */
|
||||
adds r2, r2, #4
|
||||
#ifdef __APCS_26_
|
||||
ldmeqia sp!, {r0, pc}^ /* done */
|
||||
#else
|
||||
ldmeqia sp!, {r0, pc} /* done */
|
||||
#endif
|
||||
/* copy the crud byte at a time */
|
||||
cmp r2, #2
|
||||
ldrb r3, [r1], #1
|
||||
strb r3, [r0], #1
|
||||
ldrgeb r3, [r1], #1
|
||||
strgeb r3, [r0], #1
|
||||
ldrgtb r3, [r1], #1
|
||||
strgtb r3, [r0], #1
|
||||
#ifdef __APCS_26__
|
||||
ldmia sp!, {r0, pc}^
|
||||
#else
|
||||
ldmia sp!, {r0, pc}
|
||||
#endif
|
||||
|
||||
/* erg - unaligned destination */
|
||||
Lmemcpy_fdestul:
|
||||
rsb r12, r12, #4
|
||||
cmp r12, #2
|
||||
|
||||
/* align destination with byte copies */
|
||||
ldrb r3, [r1], #1
|
||||
strb r3, [r0], #1
|
||||
ldrgeb r3, [r1], #1
|
||||
strgeb r3, [r0], #1
|
||||
ldrgtb r3, [r1], #1
|
||||
strgtb r3, [r0], #1
|
||||
subs r2, r2, r12
|
||||
blt Lmemcpy_fl4 /* less the 4 bytes */
|
||||
|
||||
ands r12, r1, #3
|
||||
beq Lmemcpy_ft8 /* we have an aligned source */
|
||||
|
||||
/* erg - unaligned source */
|
||||
/* This is where it gets nasty ... */
|
||||
Lmemcpy_fsrcul:
|
||||
bic r1, r1, #3
|
||||
ldr lr, [r1], #4
|
||||
cmp r12, #2
|
||||
bgt Lmemcpy_fsrcul3
|
||||
beq Lmemcpy_fsrcul2
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_fsrcul1loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_fsrcul1loop16:
|
||||
mov r3, lr, lsr #8
|
||||
ldmia r1!, {r4, r5, r12, lr}
|
||||
orr r3, r3, r4, lsl #24
|
||||
mov r4, r4, lsr #8
|
||||
orr r4, r4, r5, lsl #24
|
||||
mov r5, r5, lsr #8
|
||||
orr r5, r5, r12, lsl #24
|
||||
mov r12, r12, lsr #8
|
||||
orr r12, r12, lr, lsl #24
|
||||
stmia r0!, {r3-r5, r12}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_fsrcul1loop16
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_fsrcul1l4
|
||||
|
||||
Lmemcpy_fsrcul1loop4:
|
||||
mov r12, lr, lsr #8
|
||||
ldr lr, [r1], #4
|
||||
orr r12, r12, lr, lsl #24
|
||||
str r12, [r0], #4
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_fsrcul1loop4
|
||||
|
||||
Lmemcpy_fsrcul1l4:
|
||||
sub r1, r1, #3
|
||||
b Lmemcpy_fl4
|
||||
|
||||
Lmemcpy_fsrcul2:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_fsrcul2loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_fsrcul2loop16:
|
||||
mov r3, lr, lsr #16
|
||||
ldmia r1!, {r4, r5, r12, lr}
|
||||
orr r3, r3, r4, lsl #16
|
||||
mov r4, r4, lsr #16
|
||||
orr r4, r4, r5, lsl #16
|
||||
mov r5, r5, lsr #16
|
||||
orr r5, r5, r12, lsl #16
|
||||
mov r12, r12, lsr #16
|
||||
orr r12, r12, lr, lsl #16
|
||||
stmia r0!, {r3-r5, r12}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_fsrcul2loop16
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_fsrcul2l4
|
||||
|
||||
Lmemcpy_fsrcul2loop4:
|
||||
mov r12, lr, lsr #16
|
||||
ldr lr, [r1], #4
|
||||
orr r12, r12, lr, lsl #16
|
||||
str r12, [r0], #4
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_fsrcul2loop4
|
||||
|
||||
Lmemcpy_fsrcul2l4:
|
||||
sub r1, r1, #2
|
||||
b Lmemcpy_fl4
|
||||
|
||||
Lmemcpy_fsrcul3:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_fsrcul3loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_fsrcul3loop16:
|
||||
mov r3, lr, lsr #24
|
||||
ldmia r1!, {r4, r5, r12, lr}
|
||||
orr r3, r3, r4, lsl #8
|
||||
mov r4, r4, lsr #24
|
||||
orr r4, r4, r5, lsl #8
|
||||
mov r5, r5, lsr #24
|
||||
orr r5, r5, r12, lsl #8
|
||||
mov r12, r12, lsr #24
|
||||
orr r12, r12, lr, lsl #8
|
||||
stmia r0!, {r3-r5, r12}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_fsrcul3loop16
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_fsrcul3l4
|
||||
|
||||
Lmemcpy_fsrcul3loop4:
|
||||
mov r12, lr, lsr #24
|
||||
ldr lr, [r1], #4
|
||||
orr r12, r12, lr, lsl #8
|
||||
str r12, [r0], #4
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_fsrcul3loop4
|
||||
|
||||
Lmemcpy_fsrcul3l4:
|
||||
sub r1, r1, #1
|
||||
b Lmemcpy_fl4
|
||||
|
||||
Lmemcpy_backwards:
|
||||
add r1, r1, r2
|
||||
add r0, r0, r2
|
||||
subs r2, r2, #4
|
||||
blt Lmemcpy_bl4 /* less than 4 bytes */
|
||||
ands r12, r0, #3
|
||||
bne Lmemcpy_bdestul /* oh unaligned destination addr */
|
||||
ands r12, r1, #3
|
||||
bne Lmemcpy_bsrcul /* oh unaligned source addr */
|
||||
|
||||
Lmemcpy_bt8:
|
||||
/* We have aligned source and destination */
|
||||
subs r2, r2, #8
|
||||
blt Lmemcpy_bl12 /* less than 12 bytes (4 from above) */
|
||||
stmdb sp!, {r4}
|
||||
subs r2, r2, #0x14 /* less than 32 bytes (12 from above) */
|
||||
blt Lmemcpy_bl32
|
||||
|
||||
/* blat 32 bytes at a time */
|
||||
/* XXX for really big copies perhaps we should use more registers */
|
||||
Lmemcpy_bloop32:
|
||||
ldmdb r1!, {r3, r4, r12, lr}
|
||||
stmdb r0!, {r3, r4, r12, lr}
|
||||
ldmdb r1!, {r3, r4, r12, lr}
|
||||
stmdb r0!, {r3, r4, r12, lr}
|
||||
subs r2, r2, #0x20
|
||||
bge Lmemcpy_bloop32
|
||||
|
||||
Lmemcpy_bl32:
|
||||
cmn r2, #0x10
|
||||
ldmgedb r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
|
||||
stmgedb r0!, {r3, r4, r12, lr}
|
||||
subge r2, r2, #0x10
|
||||
adds r2, r2, #0x14
|
||||
ldmgedb r1!, {r3, r12, lr} /* blat a remaining 12 bytes */
|
||||
stmgedb r0!, {r3, r12, lr}
|
||||
subge r2, r2, #0x0c
|
||||
ldmia sp!, {r4}
|
||||
|
||||
Lmemcpy_bl12:
|
||||
adds r2, r2, #8
|
||||
blt Lmemcpy_bl4
|
||||
subs r2, r2, #4
|
||||
ldrlt r3, [r1, #-4]!
|
||||
strlt r3, [r0, #-4]!
|
||||
ldmgedb r1!, {r3, r12}
|
||||
stmgedb r0!, {r3, r12}
|
||||
subge r2, r2, #4
|
||||
|
||||
Lmemcpy_bl4:
|
||||
/* less than 4 bytes to go */
|
||||
adds r2, r2, #4
|
||||
#ifdef __APCS_26__
|
||||
ldmeqia sp!, {r0, pc}^
|
||||
#else
|
||||
ldmeqia sp!, {r0, pc}
|
||||
#endif
|
||||
|
||||
/* copy the crud byte at a time */
|
||||
cmp r2, #2
|
||||
ldrb r3, [r1, #-1]!
|
||||
strb r3, [r0, #-1]!
|
||||
ldrgeb r3, [r1, #-1]!
|
||||
strgeb r3, [r0, #-1]!
|
||||
ldrgtb r3, [r1, #-1]!
|
||||
strgtb r3, [r0, #-1]!
|
||||
#ifdef __APCS_26__
|
||||
ldmia sp!, {r0, pc}^
|
||||
#else
|
||||
ldmia sp!, {r0, pc}
|
||||
#endif
|
||||
|
||||
/* erg - unaligned destination */
|
||||
Lmemcpy_bdestul:
|
||||
cmp r12, #2
|
||||
|
||||
/* align destination with byte copies */
|
||||
ldrb r3, [r1, #-1]!
|
||||
strb r3, [r0, #-1]!
|
||||
ldrgeb r3, [r1, #-1]!
|
||||
strgeb r3, [r0, #-1]!
|
||||
ldrgtb r3, [r1, #-1]!
|
||||
strgtb r3, [r0, #-1]!
|
||||
subs r2, r2, r12
|
||||
blt Lmemcpy_bl4 /* less than 4 bytes to go */
|
||||
ands r12, r1, #3
|
||||
beq Lmemcpy_bt8 /* we have an aligned source */
|
||||
|
||||
/* erg - unaligned source */
|
||||
/* This is where it gets nasty ... */
|
||||
Lmemcpy_bsrcul:
|
||||
bic r1, r1, #3
|
||||
ldr r3, [r1, #0]
|
||||
cmp r12, #2
|
||||
blt Lmemcpy_bsrcul1
|
||||
beq Lmemcpy_bsrcul2
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_bsrcul3loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_bsrcul3loop16:
|
||||
mov lr, r3, lsl #8
|
||||
ldmdb r1!, {r3-r5, r12}
|
||||
orr lr, lr, r12, lsr #24
|
||||
mov r12, r12, lsl #8
|
||||
orr r12, r12, r5, lsr #24
|
||||
mov r5, r5, lsl #8
|
||||
orr r5, r5, r4, lsr #24
|
||||
mov r4, r4, lsl #8
|
||||
orr r4, r4, r3, lsr #24
|
||||
stmdb r0!, {r4, r5, r12, lr}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_bsrcul3loop16
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_bsrcul3l4
|
||||
|
||||
Lmemcpy_bsrcul3loop4:
|
||||
mov r12, r3, lsl #8
|
||||
ldr r3, [r1, #-4]!
|
||||
orr r12, r12, r3, lsr #24
|
||||
str r12, [r0, #-4]!
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_bsrcul3loop4
|
||||
|
||||
Lmemcpy_bsrcul3l4:
|
||||
add r1, r1, #3
|
||||
b Lmemcpy_bl4
|
||||
|
||||
Lmemcpy_bsrcul2:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_bsrcul2loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_bsrcul2loop16:
|
||||
mov lr, r3, lsl #16
|
||||
ldmdb r1!, {r3-r5, r12}
|
||||
orr lr, lr, r12, lsr #16
|
||||
mov r12, r12, lsl #16
|
||||
orr r12, r12, r5, lsr #16
|
||||
mov r5, r5, lsl #16
|
||||
orr r5, r5, r4, lsr #16
|
||||
mov r4, r4, lsl #16
|
||||
orr r4, r4, r3, lsr #16
|
||||
stmdb r0!, {r4, r5, r12, lr}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_bsrcul2loop16
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_bsrcul2l4
|
||||
|
||||
Lmemcpy_bsrcul2loop4:
|
||||
mov r12, r3, lsl #16
|
||||
ldr r3, [r1, #-4]!
|
||||
orr r12, r12, r3, lsr #16
|
||||
str r12, [r0, #-4]!
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_bsrcul2loop4
|
||||
|
||||
Lmemcpy_bsrcul2l4:
|
||||
add r1, r1, #2
|
||||
b Lmemcpy_bl4
|
||||
|
||||
Lmemcpy_bsrcul1:
|
||||
cmp r2, #0x0c
|
||||
blt Lmemcpy_bsrcul1loop4
|
||||
sub r2, r2, #0x0c
|
||||
stmdb sp!, {r4, r5}
|
||||
|
||||
Lmemcpy_bsrcul1loop32:
|
||||
mov lr, r3, lsl #24
|
||||
ldmdb r1!, {r3-r5, r12}
|
||||
orr lr, lr, r12, lsr #8
|
||||
mov r12, r12, lsl #24
|
||||
orr r12, r12, r5, lsr #8
|
||||
mov r5, r5, lsl #24
|
||||
orr r5, r5, r4, lsr #8
|
||||
mov r4, r4, lsl #24
|
||||
orr r4, r4, r3, lsr #8
|
||||
stmdb r0!, {r4, r5, r12, lr}
|
||||
subs r2, r2, #0x10
|
||||
bge Lmemcpy_bsrcul1loop32
|
||||
ldmia sp!, {r4, r5}
|
||||
adds r2, r2, #0x0c
|
||||
blt Lmemcpy_bsrcul1l4
|
||||
|
||||
Lmemcpy_bsrcul1loop4:
|
||||
mov r12, r3, lsl #24
|
||||
ldr r3, [r1, #-4]!
|
||||
orr r12, r12, r3, lsr #8
|
||||
str r12, [r0, #-4]!
|
||||
subs r2, r2, #4
|
||||
bge Lmemcpy_bsrcul1loop4
|
||||
|
||||
Lmemcpy_bsrcul1l4:
|
||||
add r1, r1, #1
|
||||
b Lmemcpy_bl4
|
||||
|
||||
|
||||
@ -1,48 +1,5 @@
|
||||
/* $NetBSD: memmove.S,v 1.1 2000/12/29 20:51:57 bjh21 Exp $ */
|
||||
/* $NetBSD: memmove.S,v 1.2 2001/11/20 00:29:20 chris Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1997 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to The NetBSD Foundation
|
||||
* by Neil A. Carson and Mark Brinicombe
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||||
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||||
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
/*
|
||||
* placeholder to keep the make system happy, memove is actually in memcpy.S
|
||||
*/
|
||||
|
||||
#include <machine/asm.h>
|
||||
|
||||
ENTRY(memmove)
|
||||
stmfd sp!, {r0, lr}
|
||||
bl _C_LABEL(_memcpy)
|
||||
#ifdef __APCS_26__
|
||||
ldmfd sp!, {r0, pc}^
|
||||
#else
|
||||
ldmfd sp!, {r0, pc}
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user