176 lines
4.4 KiB
ArmAsm
176 lines
4.4 KiB
ArmAsm
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2006 Free Software Foundation, Inc.
|
|
* This file was originally part of the GNU C Library
|
|
* Contributed to glibc by MontaVista Software, Inc. (written by Nicolas Pitre)
|
|
* Adapted for Rockbox by Daniel Ankers
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "config.h"
|
|
|
|
/*
|
|
* Endian independent macros for shifting bytes within registers.
|
|
*/
|
|
#ifndef __ARMEB__
|
|
#define pull lsr
|
|
#define push lsl
|
|
#else
|
|
#define pull lsl
|
|
#define push lsr
|
|
#endif
|
|
|
|
/* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
|
|
|
|
.section .icode,"ax",%progbits
|
|
|
|
.align 2
|
|
.global memcpy
|
|
.type memcpy,%function
|
|
|
|
memcpy:
|
|
stmfd sp!, {r0, r4, lr}
|
|
|
|
subs r2, r2, #4
|
|
blt 8f
|
|
ands ip, r0, #3
|
|
bne 9f
|
|
ands ip, r1, #3
|
|
bne 10f
|
|
|
|
1: subs r2, r2, #(28)
|
|
stmfd sp!, {r5 - r8}
|
|
blt 5f
|
|
|
|
2:
|
|
3:
|
|
4: ldmia r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
|
|
subs r2, r2, #32
|
|
stmia r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
|
|
bge 3b
|
|
|
|
5: ands ip, r2, #28
|
|
rsb ip, ip, #32
|
|
addne pc, pc, ip @ C is always clear here
|
|
b 7f
|
|
6: nop
|
|
ldr r3, [r1], #4
|
|
ldr r4, [r1], #4
|
|
ldr r5, [r1], #4
|
|
ldr r6, [r1], #4
|
|
ldr r7, [r1], #4
|
|
ldr r8, [r1], #4
|
|
ldr lr, [r1], #4
|
|
|
|
add pc, pc, ip
|
|
nop
|
|
nop
|
|
str r3, [r0], #4
|
|
str r4, [r0], #4
|
|
str r5, [r0], #4
|
|
str r6, [r0], #4
|
|
str r7, [r0], #4
|
|
str r8, [r0], #4
|
|
str lr, [r0], #4
|
|
|
|
7: ldmfd sp!, {r5 - r8}
|
|
|
|
8: movs r2, r2, lsl #31
|
|
ldrneb r3, [r1], #1
|
|
ldrcsb r4, [r1], #1
|
|
ldrcsb ip, [r1]
|
|
strneb r3, [r0], #1
|
|
strcsb r4, [r0], #1
|
|
strcsb ip, [r0]
|
|
|
|
ldmpc regs="r0, r4"
|
|
|
|
9: rsb ip, ip, #4
|
|
cmp ip, #2
|
|
ldrgtb r3, [r1], #1
|
|
ldrgeb r4, [r1], #1
|
|
ldrb lr, [r1], #1
|
|
strgtb r3, [r0], #1
|
|
strgeb r4, [r0], #1
|
|
subs r2, r2, ip
|
|
strb lr, [r0], #1
|
|
blt 8b
|
|
ands ip, r1, #3
|
|
beq 1b
|
|
|
|
10: bic r1, r1, #3
|
|
cmp ip, #2
|
|
ldr lr, [r1], #4
|
|
beq 17f
|
|
bgt 18f
|
|
|
|
|
|
.macro forward_copy_shift pull push
|
|
|
|
subs r2, r2, #28
|
|
blt 14f
|
|
|
|
11: stmfd sp!, {r5 - r9}
|
|
|
|
12:
|
|
13: ldmia r1!, {r4, r5, r6, r7}
|
|
mov r3, lr, pull #\pull
|
|
subs r2, r2, #32
|
|
ldmia r1!, {r8, r9, ip, lr}
|
|
orr r3, r3, r4, push #\push
|
|
mov r4, r4, pull #\pull
|
|
orr r4, r4, r5, push #\push
|
|
mov r5, r5, pull #\pull
|
|
orr r5, r5, r6, push #\push
|
|
mov r6, r6, pull #\pull
|
|
orr r6, r6, r7, push #\push
|
|
mov r7, r7, pull #\pull
|
|
orr r7, r7, r8, push #\push
|
|
mov r8, r8, pull #\pull
|
|
orr r8, r8, r9, push #\push
|
|
mov r9, r9, pull #\pull
|
|
orr r9, r9, ip, push #\push
|
|
mov ip, ip, pull #\pull
|
|
orr ip, ip, lr, push #\push
|
|
stmia r0!, {r3, r4, r5, r6, r7, r8, r9, ip}
|
|
bge 12b
|
|
|
|
ldmfd sp!, {r5 - r9}
|
|
|
|
14: ands ip, r2, #28
|
|
beq 16f
|
|
|
|
15: mov r3, lr, pull #\pull
|
|
ldr lr, [r1], #4
|
|
subs ip, ip, #4
|
|
orr r3, r3, lr, push #\push
|
|
str r3, [r0], #4
|
|
bgt 15b
|
|
|
|
16: sub r1, r1, #(\push / 8)
|
|
b 8b
|
|
|
|
.endm
|
|
|
|
|
|
forward_copy_shift pull=8 push=24
|
|
|
|
17: forward_copy_shift pull=16 push=16
|
|
|
|
18: forward_copy_shift pull=24 push=8
|
|
|