1 | /* |
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2 | * (c) Copyright 1986 HEWLETT-PACKARD COMPANY |
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3 | * |
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4 | * To anyone who acknowledges that this file is provided "AS IS" |
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5 | * without any express or implied warranty: |
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6 | * permission to use, copy, modify, and distribute this file |
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7 | * for any purpose is hereby granted without fee, provided that |
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8 | * the above copyright notice and this notice appears in all |
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9 | * copies, and that the name of Hewlett-Packard Company not be |
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10 | * used in advertising or publicity pertaining to distribution |
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11 | * of the software without specific, written prior permission. |
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12 | * Hewlett-Packard Company makes no representations about the |
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13 | * suitability of this software for any purpose. |
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14 | */ |
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15 | |
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16 | /* HPUX_ID: @(#) $Revision$ */ |
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17 | /* |
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18 | * strcat(s1, s2) |
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19 | * |
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20 | * Concatenate s2 on the end of s1. S1's space must be large enough. |
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21 | * Return s1. |
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22 | */ |
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23 | #include "DEFS.h" |
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24 | |
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25 | #define d_addr r26 |
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26 | #define s_addr r25 |
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27 | #define tmp6 r24 |
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28 | #define tmp1 r19 |
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29 | #define tmp2 r20 |
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30 | #define tmp3 r21 |
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31 | #define tmp4 r22 |
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32 | #define tmp5 arg3 |
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33 | #define save r1 |
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34 | |
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35 | |
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36 | ENTRY(strcat) |
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37 | |
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38 | comb,= r0,s_addr,done /* quit if s2=NULL */ |
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39 | copy d_addr,ret0 /* The return value is the value of d_addr. DELAY SLOT*/ |
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40 | |
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41 | /* First look for end of s1 (d_addr) */ |
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42 | |
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43 | extru d_addr,31,2,tmp1 /* Extract the low two bits of the dest address. */ |
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44 | combt,= tmp1,r0,dont_mask |
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45 | dep 0,31,2,d_addr /*set word alignment */ |
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46 | ldwm 4(d_addr),tmp2 |
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47 | sh3add tmp1,r0,save /* build mask based on tmp1 */ |
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48 | mtctl save,11 |
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49 | zvdepi -2,32,save |
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50 | or save,tmp2,tmp2 |
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51 | uxor,nbz tmp2,r0,save |
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52 | search: |
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53 | b,n found_end /* nullified under uxor conditions above and below */ |
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54 | dont_mask: |
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55 | ldwm 4(d_addr),tmp2 |
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56 | comib,tr r0,r0,search |
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57 | uxor,nbz tmp2,r0,save |
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58 | |
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59 | found_end: /* at this point d_addr points to word */ |
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60 | extru,<> save,7,8,r0 /* following word with null */ |
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61 | addib,tr,n -4,d_addr,begin_copy /*set d_addr to end of s1 */ |
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62 | extru,<> save,15,8,r0 |
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63 | addib,tr,n -3,d_addr,begin_copy |
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64 | extru,<> save,23,8,r0 |
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65 | addi -1,d_addr,d_addr |
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66 | addi -1,d_addr,d_addr |
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67 | |
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68 | |
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69 | begin_copy: |
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70 | |
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71 | extru s_addr,31,2,tmp1 /* Extract the low two bits of the source address. */ |
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72 | extru d_addr,31,2,tmp6 /* Extract the low two bits of the destination address. */ |
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73 | sub,= tmp6,tmp1,tmp3 /* Compute the shift quantity and don't branch if tmp6=tmp1. */ |
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74 | b not_aligned /* Not_aligned says that shifts Will be needed. */ |
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75 | dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT. */ |
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76 | /* aligned */ |
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77 | |
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78 | combt,= tmp6,r0,skip_mask |
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79 | ldwm 4(0,s_addr),tmp1 /* tmp1 = *s_addr s_addr += 4 (DELAY SLOT) */ |
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80 | sh3add tmp6,r0,save |
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81 | mtctl save,r11 |
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82 | zvdepi -2,32,save |
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83 | or save,tmp1,tmp1 |
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84 | uxor,nbz tmp1,r0,save |
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85 | b,n first_null /* special case: null in first word */ |
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86 | b,n skip_mask2 |
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87 | |
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88 | chunks: |
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89 | b,n null_found /* delay slot for uxor below */ |
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90 | |
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91 | skip_mask2: |
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92 | stbys,b,m tmp1,4(d_addr) |
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93 | ldwm 4(s_addr),tmp1 |
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94 | skip_mask: |
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95 | comib,tr 0,0,chunks |
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96 | uxor,nbz tmp1,r0,save |
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97 | |
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98 | /* Begin non_aligned code. */ |
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99 | |
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100 | not_aligned: |
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101 | sh3add,>= tmp3,r0,tmp4 /* compute the shift amt.and skip load if tmp6 > tmp1. */ |
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102 | ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++ */ |
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103 | ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */ |
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104 | combt,= tmp6,r0,chunk2 /* don't mask if whole word is valid */ |
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105 | mtctl tmp4,11 /* load the shift count into cr11 = shift count register. */ |
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106 | vshd tmp1,tmp2,tmp3 /* position data ! (delay slot) */ |
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107 | sh3add tmp6,r0,save /* setup r1 */ |
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108 | mtctl save,r11 /* set-up cr11 for mask */ |
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109 | zvdepi -2,32,save |
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110 | or save, tmp3, tmp3 |
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111 | uxor,nbz tmp3,r0,save |
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112 | b,n first_null2 |
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113 | b did_mask |
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114 | mtctl tmp4,11 /* re-load the shift count into cr11 */ |
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115 | |
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116 | chunk2: |
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117 | vshd tmp1,tmp2,tmp3 |
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118 | uxor,nbz tmp3, r0, save |
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119 | b,n null_found |
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120 | did_mask: |
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121 | stbys,b,m tmp3,4(0,d_addr) /* store ! */ |
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122 | |
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123 | ldwm 4(0,s_addr),tmp1 /* get next word ! */ |
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124 | vshd tmp2,tmp1,tmp3 /* position data ! */ |
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125 | uxor,nbz tmp3, r0, save |
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126 | b,n null_found |
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127 | stwm tmp3,4(d_addr) |
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128 | comib,tr 0,0,chunk2 |
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129 | ldwm 4(s_addr),tmp2 |
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130 | |
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131 | |
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132 | null_found: /* adjust d_addr and store final word */ |
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133 | |
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134 | extru,<> save,7,8,r0 |
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135 | addib,tr,n 1,d_addr,store_final |
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136 | extru,<> save,15,8,r0 |
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137 | addib,tr,n 2,d_addr,store_final |
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138 | extru,<> save,23,8,r0 |
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139 | addib,tr 3,d_addr,store_final2 |
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140 | bv 0(r2) |
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141 | stw save,0(d_addr) |
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142 | |
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143 | store_final: |
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144 | bv 0(r2) |
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145 | store_final2: |
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146 | stbys,e save,0(d_addr) /* delay slot */ |
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147 | |
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148 | first_null: /* null found in first word of aligned (wrt d_addr) */ |
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149 | addi -4,s_addr,s_addr |
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150 | ldbx tmp6(s_addr),tmp4 |
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151 | add tmp6,s_addr,s_addr |
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152 | comib,= 0,tmp4,done |
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153 | stbs,ma tmp4,1(d_addr) |
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154 | ldbs 1(s_addr),tmp4 |
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155 | comib,= 0,tmp4,done |
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156 | stbs,ma tmp4,1(d_addr) |
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157 | bv 0(r2) /* done */ |
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158 | stbs 0,0(d_addr) |
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159 | |
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160 | first_null2: /* null found in first word of non-aligned (wrt d_addr) */ |
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161 | addibt,= -1,tmp6,check3 /* check last 3 bytes of word */ |
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162 | extru save,15,8,tmp4 |
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163 | addibt,=,n -1,tmp6,check2 /* check last 2 bytes */ |
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164 | bv 0(r2) |
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165 | stbys,b save, 0(d_addr) |
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166 | |
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167 | check3: |
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168 | combt,= tmp4,r0,done |
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169 | stbs,ma tmp4,1(d_addr) |
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170 | check2: |
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171 | extru,<> save,23,8,tmp4 |
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172 | bv 0(r2) |
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173 | stbs,ma tmp4,1(d_addr) |
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174 | bv 0(r2) |
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175 | stbs r0,0(d_addr) |
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176 | |
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177 | done: |
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178 | EXIT(strcat) |
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