| 1 | #
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| 2 | # Copyright (c) 2007 Michal Kebrt
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 |
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| 30 | .text
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| 31 |
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| 32 | .global memcpy
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| 33 |
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| 34 | memcpy:
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| 35 | add r3, r1, #3
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| 36 | bic r3, r3, #3
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| 37 | cmp r1, r3
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| 38 | stmdb sp!, {r4, lr}
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| 39 | beq 4f
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| 40 | 1:
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| 41 | cmp r2, #0
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| 42 | movne ip, #0
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| 43 | beq 3f
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| 44 | 2:
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| 45 | ldrb r3, [ip, r1]
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| 46 | strb r3, [ip, r0]
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| 47 | add ip, ip, #1
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| 48 | cmp ip, r2
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| 49 | bne 2b
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| 50 | 3:
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| 51 | mov r0, r1
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| 52 | ldmia sp!, {r4, pc}
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| 53 | 4:
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| 54 | add r3, r0, #3
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| 55 | bic r3, r3, #3
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| 56 | cmp r0, r3
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| 57 | bne 1b
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| 58 | movs r4, r2, lsr #2
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| 59 | moveq lr, r4
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| 60 | beq 6f
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| 61 | mov lr, #0
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| 62 | mov ip, lr
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| 63 | 5:
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| 64 | ldr r3, [ip, r1]
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| 65 | add lr, lr, #1
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| 66 | cmp lr, r4
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| 67 | str r3, [ip, r0]
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| 68 | add ip, ip, #4
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| 69 | bne 5b
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| 70 | 6:
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| 71 | ands r4, r2, #3
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| 72 | beq 3b
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| 73 | mov r3, lr, lsl #2
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| 74 | add r0, r3, r0
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| 75 | add ip, r3, r1
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| 76 | mov r2, #0
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| 77 | 7:
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| 78 | ldrb r3, [r2, ip]
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| 79 | strb r3, [r2, r0]
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| 80 | add r2, r2, #1
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| 81 | cmp r2, r4
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| 82 | bne 7b
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| 83 | b 3b
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| 84 |
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| 85 |
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