1 | /* Copyright (c) 2009 Xilinx, Inc. All rights reserved. |
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2 | |
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3 | Redistribution and use in source and binary forms, with or without |
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4 | modification, are permitted provided that the following conditions are |
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5 | met: |
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6 | |
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7 | 1. Redistributions source code must retain the above copyright notice, |
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8 | this list of conditions and the following disclaimer. |
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9 | |
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10 | 2. Redistributions in binary form must reproduce the above copyright |
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11 | notice, this list of conditions and the following disclaimer in the |
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12 | documentation and/or other materials provided with the distribution. |
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13 | |
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14 | 3. Neither the name of Xilinx nor the names of its contributors may be |
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15 | used to endorse or promote products derived from this software without |
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16 | specific prior written permission. |
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17 | |
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18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS |
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19 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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20 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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21 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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22 | HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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23 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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24 | TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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25 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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26 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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27 | 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 string |
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33 | |
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34 | INDEX |
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35 | strcpy |
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36 | |
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37 | SYNOPSIS |
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38 | #include <string.h> |
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39 | char *strcpy(char *restrict <[dst]>, const char *restrict <[src]>); |
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40 | |
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41 | DESCRIPTION |
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42 | <<strcpy>> copies the string pointed to by <[src]> |
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43 | (including the terminating null character) to the array |
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44 | pointed to by <[dst]>. |
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45 | |
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46 | RETURNS |
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47 | This function returns the initial value of <[dst]>. |
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48 | |
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49 | PORTABILITY |
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50 | <<strcpy>> is ANSI C. |
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51 | |
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52 | <<strcpy>> requires no supporting OS subroutines. |
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53 | |
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54 | QUICKREF |
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55 | strcpy ansi pure |
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56 | */ |
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57 | |
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58 | #include <string.h> |
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59 | #include <limits.h> |
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60 | |
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61 | /*SUPPRESS 560*/ |
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62 | /*SUPPRESS 530*/ |
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63 | |
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64 | /* Nonzero if either X or Y is not aligned on a "long" boundary. */ |
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65 | #define UNALIGNED(X, Y) \ |
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66 | (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1))) |
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67 | |
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68 | #if LONG_MAX == 2147483647L |
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69 | #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) |
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70 | #else |
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71 | #if LONG_MAX == 9223372036854775807L |
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72 | /* Nonzero if X (a long int) contains a NULL byte. */ |
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73 | #define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) |
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74 | #else |
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75 | #error long int is not a 32bit or 64bit type. |
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76 | #endif |
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77 | #endif |
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78 | |
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79 | #ifndef DETECTNULL |
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80 | #error long int is not a 32bit or 64bit byte |
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81 | #endif |
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82 | |
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83 | char* |
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84 | strcpy (char *__restrict dst0, |
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85 | const char *__restrict src0) |
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86 | { |
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87 | |
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88 | #ifndef HAVE_HW_PCMP |
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89 | |
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90 | #if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) |
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91 | char *s = dst0; |
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92 | |
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93 | while (*dst0++ = *src0++) |
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94 | ; |
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95 | |
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96 | return s; |
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97 | #else |
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98 | char *dst = dst0; |
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99 | const char *src = src0; |
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100 | long *aligned_dst; |
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101 | const long *aligned_src; |
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102 | |
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103 | /* If SRC or DEST is unaligned, then copy bytes. */ |
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104 | if (!UNALIGNED (src, dst)) |
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105 | { |
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106 | aligned_dst = (long*)dst; |
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107 | aligned_src = (long*)src; |
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108 | |
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109 | /* SRC and DEST are both "long int" aligned, try to do "long int" |
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110 | sized copies. */ |
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111 | while (!DETECTNULL(*aligned_src)) |
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112 | { |
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113 | *aligned_dst++ = *aligned_src++; |
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114 | } |
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115 | |
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116 | dst = (char*)aligned_dst; |
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117 | src = (char*)aligned_src; |
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118 | } |
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119 | |
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120 | while (*dst++ = *src++) |
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121 | ; |
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122 | return dst0; |
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123 | #endif /* not PREFER_SIZE_OVER_SPEED */ |
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124 | |
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125 | #else |
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126 | |
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127 | #include "mb_endian.h" |
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128 | |
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129 | asm volatile (" \n\ |
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130 | or r9, r0, r0 /* Index register */ \n\ |
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131 | check_alignment: \n\ |
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132 | andi r3, r5, 3 \n\ |
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133 | andi r4, r6, 3 \n\ |
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134 | bnei r3, try_align_args \n\ |
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135 | bnei r4, regular_strcpy /* At this point we dont have a choice */ \n\ |
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136 | cpy_loop: \n" |
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137 | LOAD4BYTES("r3", "r6", "r9") |
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138 | " \n\ |
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139 | pcmpbf r4, r0, r3 \n\ |
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140 | bnei r4, cpy_bytes /* If r4 != 0, then null present within string */\n" |
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141 | STORE4BYTES("r3", "r5", "r9") |
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142 | " \n\ |
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143 | brid cpy_loop \n\ |
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144 | addik r9, r9, 4 \n\ |
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145 | cpy_bytes: \n\ |
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146 | lbu r3, r6, r9 \n\ |
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147 | sb r3, r5, r9 \n\ |
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148 | addik r4, r4, -1 \n\ |
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149 | bneid r4, cpy_bytes \n\ |
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150 | addik r9, r9, 1 /* delay slot */\n\ |
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151 | cpy_null: \n\ |
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152 | rtsd r15, 8 \n\ |
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153 | or r3, r0, r5 /* Return strcpy result */\n\ |
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154 | try_align_args: \n\ |
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155 | xor r7, r4, r3 \n\ |
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156 | bnei r7, regular_strcpy /* cannot align args */\n\ |
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157 | rsubik r10, r3, 4 /* Number of initial bytes to align */\n\ |
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158 | align_loop: \n\ |
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159 | lbu r3, r6, r9 \n\ |
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160 | sb r3, r5, r9 \n\ |
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161 | beqid r3, end_cpy /* Break if we have seen null character */\n\ |
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162 | addik r10, r10, -1 \n\ |
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163 | bneid r10, align_loop \n\ |
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164 | addik r9, r9, 1 \n\ |
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165 | bri cpy_loop \n\ |
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166 | regular_strcpy: \n\ |
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167 | lbu r3, r6, r9 \n\ |
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168 | sb r3, r5, r9 \n\ |
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169 | bneid r3, regular_strcpy \n\ |
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170 | addik r9, r9, 1 \n\ |
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171 | end_cpy: \n\ |
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172 | rtsd r15, 8 \n\ |
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173 | or r3, r0, r5 /* Return strcpy result */"); |
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174 | #endif /* ! HAVE_HW_PCMP */ |
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175 | } |
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176 | |
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177 | |
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178 | |
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179 | |
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180 | |
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