oaf-boost/libn3ds/kernel/source/kmemcpy_set.s
2023-10-14 17:49:00 +08:00

103 lines
2.5 KiB
ArmAsm

/*
* This file is part of fastboot 3DS
* Copyright (C) 2019 Aurora Wright, TuxSH, derrek, profi200
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
@ Based on https://github.com/AuroraWright/Luma3DS/blob/master/arm9/source/alignedseqmemcpy.s
.syntax unified
.arm
.cpu arm946e-s
.fpu softvfp
@ void kmemcpy(u32 *restrict dst, const u32 *restrict src, u32 size);
@ void iokmemcpy(vu32 *restrict dst, const vu32 *restrict src, u32 size);
.section .text.kmemcpy, "ax", %progbits
.global kmemcpy
.global iokmemcpy
.type kmemcpy %function
.type iokmemcpy %function
.align 2
kmemcpy:
iokmemcpy:
bics r12, r2, #31
beq kmemcpy_test_words
stmfd sp!, {r4-r10}
kmemcpy_blocks_lp:
ldmia r1!, {r3-r10}
subs r12, #32
stmia r0!, {r3-r10}
bne kmemcpy_blocks_lp
ldmfd sp!, {r4-r10}
kmemcpy_test_words:
ands r12, r2, #28
beq kmemcpy_halfword_byte
kmemcpy_words_lp:
ldr r3, [r1], #4
subs r12, #4
str r3, [r0], #4
bne kmemcpy_words_lp
kmemcpy_halfword_byte:
tst r2, #2
ldrhne r3, [r1], #2
strhne r3, [r0], #2
tst r2, #1
ldrbne r3, [r1]
strbne r3, [r0]
bx lr
@ void kmemset(u32 *ptr, u32 value, u32 size);
@ void iokmemset(vu32 *ptr, u32 value, u32 size);
.section .text.kmemset, "ax", %progbits
.global kmemset
.global iokmemset
.type kmemset %function
.type iokmemset %function
.align 2
kmemset:
iokmemset:
bics r12, r2, #31
beq kmemset_test_words
stmfd sp!, {r4-r9}
mov r3, r1
mov r4, r1
mov r5, r1
mov r6, r1
mov r7, r1
mov r8, r1
mov r9, r1
kmemset_blocks_lp:
stmia r0!, {r1, r3-r9}
subs r12, #32
bne kmemset_blocks_lp
ldmfd sp!, {r4-r9}
kmemset_test_words:
ands r12, r2, #28
beq kmemset_halfword_byte
kmemset_words_lp:
str r1, [r0], #4
subs r12, #4
bne kmemset_words_lp
kmemset_halfword_byte:
tst r2, #2
strhne r1, [r0], #2
tst r2, #1
strbne r1, [r0]
bx lr