[444] | 1 | /* |
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| 2 | Copyright (c) 2013 Andes Technology Corporation. |
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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 are met: |
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| 7 | |
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| 8 | Redistributions of source code must retain the above copyright |
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| 9 | notice, this list of conditions and the following disclaimer. |
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| 10 | |
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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 | |
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| 15 | The name of the company may not be used to endorse or promote |
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| 16 | products derived from this software without specific prior written |
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| 17 | permission. |
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| 18 | |
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| 19 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 20 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 22 | DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY |
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| 23 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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| 24 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 25 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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| 26 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 27 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 28 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 29 | |
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| 30 | |
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| 31 | Function: |
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| 32 | strcpy - copy a string. |
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| 33 | Syntax: |
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| 34 | char *strcpy(char *dest, const char *src); |
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| 35 | Description: |
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| 36 | This function copies the string pointed to by src into the array |
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| 37 | point to by dest (include the teminating null character). |
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| 38 | Return value: |
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| 39 | strcpy returns the dest as given. |
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| 40 | */ |
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| 41 | .text |
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| 42 | .align 2 |
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| 43 | .globl strcpy |
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| 44 | .type strcpy, @function |
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| 45 | strcpy: |
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| 46 | move $r3, $r0 /* Keep r0 as reture value. */ |
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| 47 | /* If SRC or DEST is unaligned, then copy bytes. */ |
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| 48 | or $r2, $r1, $r0 |
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| 49 | andi $r2, $r2, #3 |
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| 50 | bnez $r2, .Lbyte_mode |
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| 51 | |
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| 52 | .Lword_mode: |
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| 53 | /* SRC and DEST are both "long int" aligned, try to do "long int" |
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| 54 | sized copies. */ |
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| 55 | /* #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) |
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| 56 | DETECTNULL returns nonzero if (long)X contains a NULL byte. */ |
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| 57 | lwi $r2, [$r1+(0)] /* r2 is X */ |
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| 58 | sethi $r4, hi20(0xFEFEFEFF) |
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| 59 | ori $r4, $r4, lo12(0xFEFEFEFF) |
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| 60 | add $r4, $r2, $r4 /* r4 = ((X) - 0x01010101) */ |
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| 61 | nor $r5, $r2, $r2 /* r5 = ~(X) */ |
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| 62 | and $r4, $r5, $r4 /* r4 = ~(X) & ((X) - 0x01010101) */ |
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| 63 | sethi $r5, hi20(0x80808080) |
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| 64 | ori $r5, $r5, lo12(0x80808080) |
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| 65 | and $r4, $r4, $r5 /* r4 = r4 & 0x80808080 */ |
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| 66 | bnez $r4, .Lbyte_mode /* Contains a NULL byte. */ |
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| 67 | swi.bi $r2, [$r3], #4 |
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| 68 | addi $r1, $r1, #4 |
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| 69 | b .Lword_mode |
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| 70 | |
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| 71 | .Lbyte_mode: |
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| 72 | lbi.bi $r4, [$r1], #1 /* r4 <- *src++ */ |
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| 73 | sbi.bi $r4, [$r3], #1 /* r4 -> *dest++ */ |
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| 74 | bnez $r4, .Lbyte_mode |
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| 75 | ret |
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| 76 | .size strcpy, .-strcpy |
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