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