mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-30 19:53:46 +00:00
77 lines
2.8 KiB
ArmAsm
77 lines
2.8 KiB
ArmAsm
/*
|
|
Copyright (c) 2013 Andes Technology Corporation.
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
The name of the company may not be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
|
|
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
|
|
Function:
|
|
strcpy - copy a string.
|
|
Syntax:
|
|
char *strcpy(char *dest, const char *src);
|
|
Description:
|
|
This function copies the string pointed to by src into the array
|
|
point to by dest (include the teminating null character).
|
|
Return value:
|
|
strcpy returns the dest as given.
|
|
*/
|
|
.text
|
|
.align 2
|
|
.globl strcpy
|
|
.type strcpy, @function
|
|
strcpy:
|
|
move $r3, $r0 /* Keep r0 as reture value. */
|
|
/* If SRC or DEST is unaligned, then copy bytes. */
|
|
or $r2, $r1, $r0
|
|
andi $r2, $r2, #3
|
|
bnez $r2, .Lbyte_mode
|
|
|
|
.Lword_mode:
|
|
/* SRC and DEST are both "long int" aligned, try to do "long int"
|
|
sized copies. */
|
|
/* #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
|
|
DETECTNULL returns nonzero if (long)X contains a NULL byte. */
|
|
lwi $r2, [$r1+(0)] /* r2 is X */
|
|
sethi $r4, hi20(0xFEFEFEFF)
|
|
ori $r4, $r4, lo12(0xFEFEFEFF)
|
|
add $r4, $r2, $r4 /* r4 = ((X) - 0x01010101) */
|
|
nor $r5, $r2, $r2 /* r5 = ~(X) */
|
|
and $r4, $r5, $r4 /* r4 = ~(X) & ((X) - 0x01010101) */
|
|
sethi $r5, hi20(0x80808080)
|
|
ori $r5, $r5, lo12(0x80808080)
|
|
and $r4, $r4, $r5 /* r4 = r4 & 0x80808080 */
|
|
bnez $r4, .Lbyte_mode /* Contains a NULL byte. */
|
|
swi.bi $r2, [$r3], #4
|
|
addi $r1, $r1, #4
|
|
b .Lword_mode
|
|
|
|
.Lbyte_mode:
|
|
lbi.bi $r4, [$r1], #1 /* r4 <- *src++ */
|
|
sbi.bi $r4, [$r3], #1 /* r4 -> *dest++ */
|
|
bnez $r4, .Lbyte_mode
|
|
ret
|
|
.size strcpy, .-strcpy
|