| 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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