505d62d073
memcpy(p, unaligned, 4..) returns (p + num_of_unaligned_by_copied) instead of p because p is not preserved in the unaligned case. Noticed by Herbert Xu's superior parameter recycling coding technique which let the md4 self-test fail on avr32. Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/*
|
|
* void *memcpy(void *to, const void *from, unsigned long n)
|
|
*
|
|
* This implementation does word-aligned loads in the main loop,
|
|
* possibly sacrificing alignment of stores.
|
|
*
|
|
* Hopefully, in most cases, both "to" and "from" will be
|
|
* word-aligned to begin with.
|
|
*/
|
|
.text
|
|
.global memcpy
|
|
.type memcpy, @function
|
|
memcpy:
|
|
mov r9, r11
|
|
andl r9, 3, COH
|
|
brne 1f
|
|
|
|
/* At this point, "from" is word-aligned */
|
|
2: mov r9, r12
|
|
5: sub r10, 4
|
|
brlt 4f
|
|
|
|
3: ld.w r8, r11++
|
|
sub r10, 4
|
|
st.w r12++, r8
|
|
brge 3b
|
|
|
|
4: neg r10
|
|
reteq r9
|
|
|
|
/* Handle unaligned count */
|
|
lsl r10, 2
|
|
add pc, pc, r10
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
retal r9
|
|
|
|
/* Handle unaligned "from" pointer */
|
|
1: sub r10, 4
|
|
brlt 4b
|
|
add r10, r9
|
|
lsl r9, 2
|
|
add pc, pc, r9
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
mov r8, r12
|
|
add pc, pc, r9
|
|
sub r8, 1
|
|
nop
|
|
sub r8, 1
|
|
nop
|
|
sub r8, 1
|
|
nop
|
|
mov r9, r8
|
|
rjmp 5b
|