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90 lines
2.2 KiB
ArmAsm
90 lines
2.2 KiB
ArmAsm
/*
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* This file is part of fastboot 3DS
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* Copyright (C) 2019 Aurora Wright, TuxSH, derrek, profi200
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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@ Based on https://github.com/AuroraWright/Luma3DS/blob/master/arm9/source/alignedseqmemcpy.s
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#include "asm_macros.h"
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.syntax unified
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.cpu arm946e-s
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.fpu softvfp
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@ void iomemcpy(vu32 *restrict dst, const vu32 *restrict src, u32 size)
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BEGIN_ASM_FUNC iomemcpy
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bics r12, r2, #31
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beq iomemcpy_test_words
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stmfd sp!, {r4-r10}
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iomemcpy_blocks_lp:
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ldmia r1!, {r3-r10}
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subs r12, #32
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stmia r0!, {r3-r10}
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bne iomemcpy_blocks_lp
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ldmfd sp!, {r4-r10}
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iomemcpy_test_words:
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ands r12, r2, #28
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beq iomemcpy_halfword_byte
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iomemcpy_words_lp:
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ldr r3, [r1], #4
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subs r12, #4
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str r3, [r0], #4
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bne iomemcpy_words_lp
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iomemcpy_halfword_byte:
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tst r2, #2
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ldrhne r3, [r1], #2
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strhne r3, [r0], #2
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tst r2, #1
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ldrbne r3, [r1]
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strbne r3, [r0]
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bx lr
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END_ASM_FUNC
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@ void iomemset(vu32 *ptr, u32 value, u32 size)
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BEGIN_ASM_FUNC iomemset
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bics r12, r2, #31
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beq iomemset_test_words
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stmfd sp!, {r4-r9}
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mov r3, r1
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mov r4, r1
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mov r5, r1
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mov r6, r1
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mov r7, r1
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mov r8, r1
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mov r9, r1
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iomemset_blocks_lp:
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stmia r0!, {r1, r3-r9}
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subs r12, #32
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bne iomemset_blocks_lp
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ldmfd sp!, {r4-r9}
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iomemset_test_words:
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ands r12, r2, #28
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beq iomemset_halfword_byte
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iomemset_words_lp:
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subs r12, #4
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str r1, [r0], #4
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bne iomemset_words_lp
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iomemset_halfword_byte:
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tst r2, #2
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strhne r1, [r0], #2
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tst r2, #1
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strbne r1, [r0]
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bx lr
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END_ASM_FUNC
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