1 /* Copyright (c) 2009 Xilinx, Inc. All rights reserved.
2
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions are
5 met:
6
7 1. Redistributions source code must retain the above copyright notice,
8 this list of conditions and the following disclaimer.
9
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13
14 3. Neither the name of Xilinx nor the names of its contributors may be
15 used to endorse or promote products derived from this software without
16 specific prior written permission.
17
18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
19 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
21 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
24 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30
31 FUNCTION
32 <<strcpy>>---copy string
33
34 INDEX
35 strcpy
36
37 SYNOPSIS
38 #include <string.h>
39 char *strcpy(char *restrict <[dst]>, const char *restrict <[src]>);
40
41 DESCRIPTION
42 <<strcpy>> copies the string pointed to by <[src]>
43 (including the terminating null character) to the array
44 pointed to by <[dst]>.
45
46 RETURNS
47 This function returns the initial value of <[dst]>.
48
49 PORTABILITY
50 <<strcpy>> is ANSI C.
51
52 <<strcpy>> requires no supporting OS subroutines.
53
54 QUICKREF
55 strcpy ansi pure
56 */
57
58 #include <string.h>
59 #include <limits.h>
60
61 /*SUPPRESS 560*/
62 /*SUPPRESS 530*/
63
64 /* Nonzero if either X or Y is not aligned on a "long" boundary. */
65 #define UNALIGNED(X, Y) \
66 (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
67
68 #if LONG_MAX == 2147483647L
69 #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
70 #else
71 #if LONG_MAX == 9223372036854775807L
72 /* Nonzero if X (a long int) contains a NULL byte. */
73 #define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
74 #else
75 #error long int is not a 32bit or 64bit type.
76 #endif
77 #endif
78
79 #ifndef DETECTNULL
80 #error long int is not a 32bit or 64bit byte
81 #endif
82
83 char*
strcpy(char * __restrict dst0,const char * __restrict src0)84 strcpy (char *__restrict dst0,
85 const char *__restrict src0)
86 {
87
88 #ifndef HAVE_HW_PCMP
89
90 #if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
91 char *s = dst0;
92
93 while ((*dst0++ = *src0++))
94 ;
95
96 return s;
97 #else
98 char *dst = dst0;
99 const char *src = src0;
100 long *aligned_dst;
101 const long *aligned_src;
102
103 /* If SRC or DEST is unaligned, then copy bytes. */
104 if (!UNALIGNED (src, dst))
105 {
106 aligned_dst = (long*)dst;
107 aligned_src = (long*)src;
108
109 /* SRC and DEST are both "long int" aligned, try to do "long int"
110 sized copies. */
111 while (!DETECTNULL(*aligned_src))
112 {
113 *aligned_dst++ = *aligned_src++;
114 }
115
116 dst = (char*)aligned_dst;
117 src = (char*)aligned_src;
118 }
119
120 while ((*dst++ = *src++))
121 ;
122 return dst0;
123 #endif /* not PREFER_SIZE_OVER_SPEED */
124
125 #else
126
127 #include "mb_endian.h"
128
129 __asm__ volatile (" \n\
130 or r9, r0, r0 /* Index register */ \n\
131 check_alignment: \n\
132 andi r3, r5, 3 \n\
133 andi r4, r6, 3 \n\
134 bnei r3, try_align_args \n\
135 bnei r4, regular_strcpy /* At this point we dont have a choice */ \n\
136 cpy_loop: \n"
137 LOAD4BYTES("r3", "r6", "r9")
138 " \n\
139 pcmpbf r4, r0, r3 \n\
140 bnei r4, cpy_bytes /* If r4 != 0, then null present within string */\n"
141 STORE4BYTES("r3", "r5", "r9")
142 " \n\
143 brid cpy_loop \n\
144 addik r9, r9, 4 \n\
145 cpy_bytes: \n\
146 lbu r3, r6, r9 \n\
147 sb r3, r5, r9 \n\
148 addik r4, r4, -1 \n\
149 bneid r4, cpy_bytes \n\
150 addik r9, r9, 1 /* delay slot */\n\
151 cpy_null: \n\
152 rtsd r15, 8 \n\
153 or r3, r0, r5 /* Return strcpy result */\n\
154 try_align_args: \n\
155 xor r7, r4, r3 \n\
156 bnei r7, regular_strcpy /* cannot align args */\n\
157 rsubik r10, r3, 4 /* Number of initial bytes to align */\n\
158 align_loop: \n\
159 lbu r3, r6, r9 \n\
160 sb r3, r5, r9 \n\
161 beqid r3, end_cpy /* Break if we have seen null character */\n\
162 addik r10, r10, -1 \n\
163 bneid r10, align_loop \n\
164 addik r9, r9, 1 \n\
165 bri cpy_loop \n\
166 regular_strcpy: \n\
167 lbu r3, r6, r9 \n\
168 sb r3, r5, r9 \n\
169 bneid r3, regular_strcpy \n\
170 addik r9, r9, 1 \n\
171 end_cpy: \n\
172 rtsd r15, 8 \n\
173 or r3, r0, r5 /* Return strcpy result */");
174 #endif /* ! HAVE_HW_PCMP */
175 }
176
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179
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181
