77 lines
2.8 KiB
ArmAsm
77 lines
2.8 KiB
ArmAsm
/*
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Copyright (c) 2013 Andes Technology Corporation.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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The name of the company may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Function:
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strcpy - copy a string.
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Syntax:
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char *strcpy(char *dest, const char *src);
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Description:
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This function copies the string pointed to by src into the array
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point to by dest (include the teminating null character).
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Return value:
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strcpy returns the dest as given.
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*/
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.text
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.align 2
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.globl strcpy
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.type strcpy, @function
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strcpy:
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move $r3, $r0 /* Keep r0 as reture value. */
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/* If SRC or DEST is unaligned, then copy bytes. */
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or $r2, $r1, $r0
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andi $r2, $r2, #3
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bnez $r2, .Lbyte_mode
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.Lword_mode:
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/* SRC and DEST are both "long int" aligned, try to do "long int"
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sized copies. */
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/* #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
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DETECTNULL returns nonzero if (long)X contains a NULL byte. */
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lwi $r2, [$r1+(0)] /* r2 is X */
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sethi $r4, hi20(0xFEFEFEFF)
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ori $r4, $r4, lo12(0xFEFEFEFF)
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add $r4, $r2, $r4 /* r4 = ((X) - 0x01010101) */
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nor $r5, $r2, $r2 /* r5 = ~(X) */
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and $r4, $r5, $r4 /* r4 = ~(X) & ((X) - 0x01010101) */
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sethi $r5, hi20(0x80808080)
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ori $r5, $r5, lo12(0x80808080)
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and $r4, $r4, $r5 /* r4 = r4 & 0x80808080 */
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bnez $r4, .Lbyte_mode /* Contains a NULL byte. */
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swi.bi $r2, [$r3], #4
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addi $r1, $r1, #4
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b .Lword_mode
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.Lbyte_mode:
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lbi.bi $r4, [$r1], #1 /* r4 <- *src++ */
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sbi.bi $r4, [$r3], #1 /* r4 -> *dest++ */
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bnez $r4, .Lbyte_mode
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ret
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.size strcpy, .-strcpy
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