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| 2145 | kebrt | 1 | # |
| 2153 | kebrt | 2 | # Copyright (c) 2007 Michal Kebrt |
| 2145 | kebrt | 3 | # All rights reserved. |
| 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 | |||
| 29 | |||
| 30 | .text |
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| 31 | |||
| 2153 | kebrt | 32 | .global memcpy |
| 2145 | kebrt | 33 | |
| 34 | memcpy: |
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| 35 | |||
| 2153 | kebrt | 36 | add r3, r1, #3 |
| 37 | bic r3, r3, #3 |
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| 38 | cmp r1, r3 |
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| 39 | stmdb sp!, {r4, lr} |
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| 40 | beq case_4 |
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| 41 | case_1: |
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| 42 | cmp r2, #0 |
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| 43 | movne ip, #0 |
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| 44 | beq case_3 |
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| 45 | case_2: |
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| 46 | ldrb r3, [ip, r1] |
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| 47 | strb r3, [ip, r0] |
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| 48 | add ip, ip, #1 |
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| 49 | cmp ip, r2 |
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| 50 | bne case_2 |
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| 51 | case_3: |
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| 52 | mov r0, r1 |
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| 53 | ldmia sp!, {r4, pc} |
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| 54 | case_4: |
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| 55 | add r3, r0, #3 |
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| 56 | bic r3, r3, #3 |
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| 57 | cmp r0, r3 |
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| 58 | bne case_1 |
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| 59 | movs r4, r2, lsr #2 |
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| 60 | moveq lr, r4 |
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| 61 | beq case_6 |
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| 62 | mov lr, #0 |
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| 63 | mov ip, lr |
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| 64 | case_5: |
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| 65 | ldr r3, [ip, r1] |
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| 66 | add lr, lr, #1 |
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| 67 | cmp lr, r4 |
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| 68 | str r3, [ip, r0] |
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| 69 | add ip, ip, #4 |
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| 70 | bne case_5 |
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| 71 | case_6: |
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| 72 | ands r4, r2, #3 |
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| 73 | beq case_3 |
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| 74 | mov r3, lr, lsl #2 |
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| 75 | add r0, r3, r0 |
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| 76 | add ip, r3, r1 |
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| 77 | mov r2, #0 |
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| 78 | case_7: |
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| 79 | ldrb r3, [r2, ip] |
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| 80 | strb r3, [r2, r0] |
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| 81 | add r2, r2, #1 |
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| 82 | cmp r2, r4 |
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| 83 | bne case_7 |
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| 84 | b case_3 |
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| 2145 | kebrt | 85 | |
| 86 |