1 | /* |
---|
2 | * (c) Copyright 1986 HEWLETT-PACKARD COMPANY |
---|
3 | * |
---|
4 | * To anyone who acknowledges that this file is provided "AS IS" |
---|
5 | * without any express or implied warranty: |
---|
6 | * permission to use, copy, modify, and distribute this file |
---|
7 | * for any purpose is hereby granted without fee, provided that |
---|
8 | * the above copyright notice and this notice appears in all |
---|
9 | * copies, and that the name of Hewlett-Packard Company not be |
---|
10 | * used in advertising or publicity pertaining to distribution |
---|
11 | * of the software without specific, written prior permission. |
---|
12 | * Hewlett-Packard Company makes no representations about the |
---|
13 | * suitability of this software for any purpose. |
---|
14 | */ |
---|
15 | |
---|
16 | /*HPUX_ID: @(#) $Revision$ */ |
---|
17 | /* strncat(s1,s2,n) : concatonate at most n characters from s2 onto s1 */ |
---|
18 | |
---|
19 | #include "DEFS.h" |
---|
20 | |
---|
21 | #define d_addr r26 |
---|
22 | #define s_addr r25 |
---|
23 | #define count r24 |
---|
24 | #define tmp1 r19 |
---|
25 | #define tmp2 r20 |
---|
26 | #define tmp3 r21 |
---|
27 | #define tmp4 r22 |
---|
28 | #define tmp5 arg3 |
---|
29 | #define tmp6 r31 |
---|
30 | #define save r1 |
---|
31 | #define tmp7 ret1 /* source offset-- reset to orig source addr if not aligned */ |
---|
32 | |
---|
33 | |
---|
34 | ENTRY(strncat) |
---|
35 | |
---|
36 | comb,= r0,s_addr,quit /* quit if s2=NULL */ |
---|
37 | copy d_addr,ret0 /* The return value is the value of d_addr. DELAY SLOT*/ |
---|
38 | |
---|
39 | /* First look for end of s1 (d_addr) */ |
---|
40 | |
---|
41 | extru d_addr,31,2,tmp1 /* Extract the low two bits of the dest address. */ |
---|
42 | combt,= tmp1,r0,dont_mask |
---|
43 | dep 0,31,2,d_addr /*set word alignment */ |
---|
44 | ldwm 4(d_addr),tmp2 |
---|
45 | sh3add tmp1,r0,save /* build mask based on tmp1 */ |
---|
46 | mtctl save,11 |
---|
47 | zvdepi -2,32,save |
---|
48 | or save,tmp2,tmp2 |
---|
49 | uxor,nbz tmp2,r0,save |
---|
50 | search: |
---|
51 | b,n found_end /* nullified under uxor conditions above and below */ |
---|
52 | dont_mask: |
---|
53 | ldwm 4(d_addr),tmp2 |
---|
54 | comib,tr r0,r0,search |
---|
55 | uxor,nbz tmp2,r0,save |
---|
56 | |
---|
57 | found_end: /* at this point d_addr points to word */ |
---|
58 | extru,<> save,7,8,r0 /* following word with null */ |
---|
59 | addib,tr,n -4,d_addr,begin_copy /*set d_addr to end of s1 */ |
---|
60 | extru,<> save,15,8,r0 |
---|
61 | addib,tr,n -3,d_addr,begin_copy |
---|
62 | extru,<> save,23,8,r0 |
---|
63 | addi -1,d_addr,d_addr |
---|
64 | addi -1,d_addr,d_addr |
---|
65 | |
---|
66 | |
---|
67 | begin_copy: |
---|
68 | addibt,<,n -4,count,byteloop /* If count is <= 4 don't get fancy.*/ |
---|
69 | |
---|
70 | extru s_addr,31,2,tmp4 /* Extract the low two bits of the source address.*/ |
---|
71 | extru d_addr,31,2,tmp5 /* Extract the low two bits of the destination address.*/ |
---|
72 | add count,tmp5,count /* pre increment the count by the byte address so that the count is*/ |
---|
73 | copy s_addr,tmp6 /* save original s_addr in case we find null in first word */ |
---|
74 | copy s_addr, tmp7 /* save s_addr in case we find null before first store */ |
---|
75 | comb,<> tmp5,tmp4,not_aligned /* branch if tmp5<>tmp4. */ |
---|
76 | dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT.*/ |
---|
77 | /* aligned*/ |
---|
78 | combt,= tmp5,r0,skip_mask |
---|
79 | ldwm 4(0,s_addr),tmp1 /* tmp1 = *s_addr s_addr += 4 (DELAY SLOT)*/ |
---|
80 | sh3add tmp5,r0,save /* compute mask in save*/ |
---|
81 | mtctl save,11 |
---|
82 | zvdepi -2,32,save |
---|
83 | or save,tmp1,tmp1 /* or mask with data*/ |
---|
84 | uxor,nbz tmp1,r0,save /* check for null*/ |
---|
85 | b,n null1 |
---|
86 | addibt,< -4,count,back_porch |
---|
87 | stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/ |
---|
88 | |
---|
89 | chunks: |
---|
90 | ldwm 4(0,s_addr),tmp1 /* get a word*/ |
---|
91 | |
---|
92 | skip_mask: |
---|
93 | uxor,nbz tmp1,r0,save /* check for null*/ |
---|
94 | b,n align_null1 |
---|
95 | addibf,< -4,count,chunks |
---|
96 | stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/ |
---|
97 | |
---|
98 | back_porch: /* last word to store*/ |
---|
99 | addibt,=,n 4,count,done /* if count = 0 we're, of course, done !*/ |
---|
100 | ldws 0(s_addr),tmp1 /* load up the back_porch*/ |
---|
101 | sh3add count,r0, save /* setup right mask based on count*/ |
---|
102 | mtctl save,r11 |
---|
103 | zvdepi -2,32,save /*save now has left-hand mask*/ |
---|
104 | uaddcm r0,save,save /*form right hand mask */ |
---|
105 | or tmp1,save,tmp1 /*and insert data*/ |
---|
106 | uxor,nbz tmp1,r0,save /* check for null*/ |
---|
107 | b,n null2 |
---|
108 | add d_addr,count,d_addr/* final store address is +1 too high !*/ |
---|
109 | b done |
---|
110 | stbys,e tmp1,0(d_addr) /* done */ |
---|
111 | |
---|
112 | /* Begin non_aligned code. */ |
---|
113 | not_aligned: |
---|
114 | sub,>= tmp5,tmp4,tmp6 /* compute the shift amt.and skip load if tmp5 > tmp4.*/ |
---|
115 | ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++*/ |
---|
116 | zdep tmp6,28,29,tmp4 /* compute the number of bits to shift */ |
---|
117 | mtctl tmp4,11 /* load the shift count into cr11 = shift count register.*/ |
---|
118 | addibt,<,n -4,count,chkchnk2 /* first step in pre adjustment of count for looping.*/ |
---|
119 | |
---|
120 | ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */ |
---|
121 | combt,= tmp5,r0,skip_mask4 /* don't mask if whole word is valid*/ |
---|
122 | vshd tmp1,tmp2,tmp3 /* position data ! (delay slot)*/ |
---|
123 | sh3add tmp5,r0,save /* setup r1*/ |
---|
124 | mtctl save,r11 /* setup mask in save*/ |
---|
125 | zvdepi -2,32,save |
---|
126 | or save, tmp3, tmp3 |
---|
127 | mtctl tmp4,11 /* re-load the shift count into cr11 */ |
---|
128 | |
---|
129 | skip_mask4: |
---|
130 | uxor,nbz tmp3, r0, save |
---|
131 | b,n null4 /* special case for first word */ |
---|
132 | copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/ |
---|
133 | copy r0, tmp7 /* zero out tmp7 so we don't try to use original s_addr anymore */ |
---|
134 | b continue |
---|
135 | stbys,b,m tmp3,4(0,d_addr) /* store ! */ |
---|
136 | |
---|
137 | chunk2: |
---|
138 | ldwm 4(0,s_addr),tmp2 |
---|
139 | vshd tmp1,tmp2,tmp3 |
---|
140 | |
---|
141 | skip_mask2: |
---|
142 | uxor,nbz tmp3, r0, save |
---|
143 | b,n null3 |
---|
144 | stbys,b,m tmp3,4(0,d_addr) /* store ! */ |
---|
145 | |
---|
146 | continue: |
---|
147 | ldwm 4(0,s_addr),tmp1 /* get 2nd word ! */ |
---|
148 | vshd tmp2,tmp1,tmp3 /* position data ! */ |
---|
149 | uxor,nbz tmp3, r0, save |
---|
150 | b,n null3 |
---|
151 | |
---|
152 | addibf,< -8,count,chunk2 /* If count is still >= 8 do another loop.*/ |
---|
153 | stbys,b,m tmp3,4(0,d_addr) /* store !*/ |
---|
154 | |
---|
155 | chkchnk2: |
---|
156 | addibt,<,n 4,count,bp_0 /* if we don't have 4 bytes left then do the back porch (bp_0)*/ |
---|
157 | |
---|
158 | subchnk2: /* we have less than 8 chars to copy*/ |
---|
159 | |
---|
160 | ldwm 4(0,s_addr),tmp2 /* get next word !*/ |
---|
161 | combt,= tmp5,r0,skip_mask3 |
---|
162 | vshd tmp1,tmp2,tmp3 /* position data !*/ |
---|
163 | sh3add tmp5,r0,save /* setup r1*/ |
---|
164 | mtctl save,r11 /* setup mask in save*/ |
---|
165 | zvdepi -2,32,save |
---|
166 | or save, tmp3, tmp3 |
---|
167 | mtctl tmp4,11 /* restore shift value again */ |
---|
168 | skip_mask3: |
---|
169 | uxor,nbz tmp3,r0,save |
---|
170 | b,n null3 |
---|
171 | copy r0,tmp5 /* zero out tmp5 so null3 does correct alignment */ |
---|
172 | copy r0,tmp7 /* zero out tmp7 so we don't use orignal s_addr since no longer valid */ |
---|
173 | b bp_1 /* we now have less than 4 bytes to move*/ |
---|
174 | stbys,b,m tmp3,4(0,d_addr) /* store !*/ |
---|
175 | |
---|
176 | bp_0: |
---|
177 | copy tmp1,tmp2 /* switch registers for shift process */ |
---|
178 | addibt,<=,n 4,count,done /* if count = -4 this implies that count = 0 -> done */ |
---|
179 | |
---|
180 | bp_1: |
---|
181 | ldwm 4(0,s_addr),tmp1 /* get final word ! */ |
---|
182 | vshd tmp2,tmp1,tmp3 /* position data !*/ |
---|
183 | uxor,nbz tmp3,r0,save /* if no-byte-zero */ |
---|
184 | b,n bp_null /* don't goto no_null-find which null instead */ |
---|
185 | no_null: |
---|
186 | add d_addr,count,d_addr /* set up d_addr for stbys,e */ |
---|
187 | b done /* were done*/ |
---|
188 | stbys,e tmp3,0(0,d_addr) /* store the data !*/ |
---|
189 | |
---|
190 | /* here we do ye old byte-at-a-time moves.*/ |
---|
191 | align_null1: |
---|
192 | b byteloop |
---|
193 | addi -4,s_addr,s_addr |
---|
194 | null1: |
---|
195 | copy tmp6,s_addr /* restore orig s_addr (aligned only) */ |
---|
196 | byteloop: |
---|
197 | addibt,= 4,count,done |
---|
198 | null2: |
---|
199 | ldbs,ma 1(s_addr),tmp1 |
---|
200 | encore: |
---|
201 | combt,=,n tmp1,r0, done |
---|
202 | stbs,ma tmp1,1(d_addr) |
---|
203 | addibf,=,n -1,count,encore |
---|
204 | ldbs,ma 1(s_addr),tmp1 |
---|
205 | b,n done |
---|
206 | |
---|
207 | bp_null: |
---|
208 | addi -4,count,count /* fudge count 'cause byteloop will re-increment */ |
---|
209 | |
---|
210 | null3: /* not_aligned case reset s_addr and finish byte-wise */ |
---|
211 | combt,=,n r0,tmp7,null3a /* if tmp7 is not valid address then branch below */ |
---|
212 | b byteloop /* otherwise reset s_addr to tmp7 and finish */ |
---|
213 | copy tmp7, s_addr |
---|
214 | |
---|
215 | null3a: /* right shift target */ |
---|
216 | addibt,<,n 0,tmp6,null3b /* if left shifting */ |
---|
217 | sub r0,tmp6,tmp6 /* do null3b code */ |
---|
218 | addi -4,tmp6,tmp6 |
---|
219 | b byteloop |
---|
220 | add tmp6,s_addr,s_addr /* reset s_addr by 4 + shift_amt */ |
---|
221 | |
---|
222 | null3b: |
---|
223 | subi -8,tmp6,tmp6 |
---|
224 | add tmp5,tmp6,tmp6 /* adjust by the dest offset if this is our first store */ |
---|
225 | b byteloop |
---|
226 | add tmp6,s_addr,s_addr /* adjust s_addr by (8-shift_amt-dest_off) */ |
---|
227 | |
---|
228 | null4: |
---|
229 | add,> tmp6,r0,tmp6 /* if left shift */ |
---|
230 | b,n null3 /* then do null3 */ |
---|
231 | b byteloop |
---|
232 | addi -4,s_addr,s_addr /* adj source only by 4 */ |
---|
233 | |
---|
234 | done: |
---|
235 | bv 0(r2) |
---|
236 | stbs r0,0(d_addr) |
---|
237 | quit: |
---|
238 | EXIT(strncat) |
---|