188 lines
6.1 KiB
C
188 lines
6.1 KiB
C
/* Copyright (c) 2009 Xilinx, Inc. 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
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met:
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1. Redistributions source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. 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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3. Neither the name of Xilinx nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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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 string
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INDEX
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strcpy
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ANSI_SYNOPSIS
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#include <string.h>
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char *strcpy(char *<[dst]>, const char *<[src]>);
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TRAD_SYNOPSIS
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#include <string.h>
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char *strcpy(<[dst]>, <[src]>)
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char *<[dst]>;
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char *<[src]>;
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DESCRIPTION
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<<strcpy>> copies the string pointed to by <[src]>
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(including the terminating null character) to the array
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pointed to by <[dst]>.
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RETURNS
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This function returns the initial value of <[dst]>.
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PORTABILITY
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<<strcpy>> is ANSI C.
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<<strcpy>> requires no supporting OS subroutines.
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QUICKREF
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strcpy ansi pure
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*/
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#include <string.h>
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#include <limits.h>
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/*SUPPRESS 560*/
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/*SUPPRESS 530*/
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/* Nonzero if either X or Y is not aligned on a "long" boundary. */
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#define UNALIGNED(X, Y) \
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(((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
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#if LONG_MAX == 2147483647L
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#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
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#else
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#if LONG_MAX == 9223372036854775807L
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/* Nonzero if X (a long int) contains a NULL byte. */
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#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
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#else
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#error long int is not a 32bit or 64bit type.
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#endif
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#endif
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#ifndef DETECTNULL
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#error long int is not a 32bit or 64bit byte
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#endif
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char*
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_DEFUN (strcpy, (dst0, src0),
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char *dst0 _AND
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_CONST char *src0)
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{
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#ifndef HAVE_HW_PCMP
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#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
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char *s = dst0;
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while (*dst0++ = *src0++)
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;
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return s;
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#else
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char *dst = dst0;
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_CONST char *src = src0;
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long *aligned_dst;
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_CONST long *aligned_src;
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/* If SRC or DEST is unaligned, then copy bytes. */
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if (!UNALIGNED (src, dst))
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{
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aligned_dst = (long*)dst;
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aligned_src = (long*)src;
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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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while (!DETECTNULL(*aligned_src))
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{
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*aligned_dst++ = *aligned_src++;
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}
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dst = (char*)aligned_dst;
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src = (char*)aligned_src;
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}
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while (*dst++ = *src++)
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;
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return dst0;
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#endif /* not PREFER_SIZE_OVER_SPEED */
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#else
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#include "mb_endian.h"
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asm volatile (" \n\
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or r9, r0, r0 /* Index register */ \n\
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check_alignment: \n\
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andi r3, r5, 3 \n\
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andi r4, r6, 3 \n\
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bnei r3, try_align_args \n\
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bnei r4, regular_strcpy /* At this point we dont have a choice */ \n\
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cpy_loop: \n"
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LOAD4BYTES("r3", "r6", "r9")
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" \n\
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pcmpbf r4, r0, r3 \n\
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bnei r4, cpy_bytes /* If r4 != 0, then null present within string */\n"
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STORE4BYTES("r3", "r5", "r9")
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" \n\
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brid cpy_loop \n\
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addik r9, r9, 4 \n\
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cpy_bytes: \n\
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lbu r3, r6, r9 \n\
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sb r3, r5, r9 \n\
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addik r4, r4, -1 \n\
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bneid r4, cpy_bytes \n\
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addik r9, r9, 1 /* delay slot */\n\
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cpy_null: \n\
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rtsd r15, 8 \n\
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or r3, r0, r5 /* Return strcpy result */\n\
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try_align_args: \n\
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xor r7, r4, r3 \n\
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bnei r7, regular_strcpy /* cannot align args */\n\
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rsubik r10, r3, 4 /* Number of initial bytes to align */\n\
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align_loop: \n\
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lbu r3, r6, r9 \n\
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sb r3, r5, r9 \n\
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beqid r3, end_cpy /* Break if we have seen null character */\n\
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addik r10, r10, -1 \n\
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bneid r10, align_loop \n\
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addik r9, r9, 1 \n\
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bri cpy_loop \n\
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regular_strcpy: \n\
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lbu r3, r6, r9 \n\
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sb r3, r5, r9 \n\
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bneid r3, regular_strcpy \n\
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addik r9, r9, 1 \n\
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end_cpy: \n\
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rtsd r15, 8 \n\
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or r3, r0, r5 /* Return strcpy result */");
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#endif /* ! HAVE_HW_PCMP */
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}
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