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utils_asm.S
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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
random utilities
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/
.arm
.globl memcpy
.globl memset32
.globl memset16
.globl memset8
.text
memcpy:
cmp r2, #0
bxeq lr
stmfd sp!, {r4-r6}
orr r3, r0, r1
tst r3, #3
bne _unaligned
cmp r2, #0x0F
bls _dwordcopyfast
cmp r2, #0x1F
bls _fastcopy16
stmfd sp!, {r7-r9}
_fastcopy32:
ldmia r1!, {r3-r9,r12}
stmia r0!, {r3-r9,r12}
sub r2, r2, #0x20
cmp r2, #0x1F
bls _done
b _fastcopy32
_done:
ldmfd sp!, {r7-r9}
_fastcopy16:
cmp r2, #0xf
bls _dwordcopyfast
ldmia r1!, {r3-r6}
stmia r0!, {r3-r6}
sub r2, r2, #0x10
b _fastcopy16
_dwordcopyfast:
cmp r2, #3
bls _unaligned
ldr r3, [r1], #4
str r3, [r0], #4
sub r2, r2, #4
b _dwordcopyfast
_unaligned:
cmp r0, #0x1800000
bcs _bytecopy
mov r12, #0xff
_dwordcopy:
cmp r2, #0
beq _done2
mov r6, r0
and r3, r6, #3
ldr r4, [r6,-r3]!
mov r3, r3, lsl #3
rsb r3, r3, #0x18
bic r5, r4, r12, lsl r3
ldrb r4, [r1],#1
orr r4, r5, r4, lsl r3
str r4, [r6]
add r0, r0, #1
sub r2, r2, #1
b _dwordcopy
_bytecopy:
cmp r2, #0
beq _done2
ldrb r3, [r1], #1
strb r3, [r0], #1
sub r2, r2, #1
b _bytecopy
_done2:
ldmfd sp!, {r4-r6}
bx lr
memset32:
bics r2, #3
bxeq lr
1: str r1, [r0] ,#4
subs r2, #4
bne 1b
bx lr
memset16:
bics r2, #1
bxeq lr
1: strh r1, [r0], #2
subs r2, #2
bne 1b
bx lr
memset8:
cmp r2, #0
bxeq lr
1: strb r1, [r0], #1
subs r2, #1
bne 1b
bx lr