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ae6b8730 RH |
1 | /* strncpy(DST, SRC, COUNT) - Copy no more than COUNT bytes of the |
2 | null-terminated string from SRC to DST. If SRC does not cover all of | |
3 | COUNT, the balance is zeroed. | |
4 | For SPARC v9. | |
62f29da7 | 5 | Copyright (C) 1998, 1999, 2003 Free Software Foundation, Inc. |
ae6b8730 RH |
6 | This file is part of the GNU C Library. |
7 | Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and | |
8 | Jakub Jelinek <jj@ultra.linux.cz>. | |
9 | ||
10 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
11 | modify it under the terms of the GNU Lesser General Public |
12 | License as published by the Free Software Foundation; either | |
13 | version 2.1 of the License, or (at your option) any later version. | |
ae6b8730 RH |
14 | |
15 | The GNU C Library is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 18 | Lesser General Public License for more details. |
ae6b8730 | 19 | |
41bdb6e2 AJ |
20 | You should have received a copy of the GNU Lesser General Public |
21 | License along with the GNU C Library; if not, write to the Free | |
22 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
23 | 02111-1307 USA. */ | |
ae6b8730 RH |
24 | |
25 | #include <sysdep.h> | |
26 | #include <asm/asi.h> | |
27 | #ifndef XCC | |
28 | #define XCC xcc | |
29 | #define USE_BPR | |
8cb079d4 UD |
30 | .register %g2, #scratch |
31 | .register %g3, #scratch | |
62f29da7 | 32 | .register %g6, #scratch |
ae6b8730 RH |
33 | #endif |
34 | ||
35 | /* Normally, this uses | |
36 | ((xword - 0x0101010101010101) & 0x8080808080808080) test | |
37 | to find out if any byte in xword could be zero. This is fast, but | |
38 | also gives false alarm for any byte in range 0x81-0xff. It does | |
39 | not matter for correctness, as if this test tells us there could | |
40 | be some zero byte, we check it byte by byte, but if bytes with | |
41 | high bits set are common in the strings, then this will give poor | |
42 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm | |
43 | will use one tick slower, but more precise test | |
44 | ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), | |
45 | which does not give any false alarms (but if some bits are set, | |
46 | one cannot assume from it which bytes are zero and which are not). | |
47 | It is yet to be measured, what is the correct default for glibc | |
48 | in these days for an average user. | |
49 | */ | |
50 | ||
51 | .text | |
52 | .align 32 | |
53 | ENTRY(strncpy) | |
54 | sethi %hi(0x01010101), %g1 /* IEU0 Group */ | |
55 | #ifdef USE_BPR | |
56 | brz,pn %o2, 19f /* CTI+IEU1 */ | |
57 | #else | |
58 | tst %o2 /* IEU1 */ | |
59 | be,pn %XCC, 19f /* CTI */ | |
60 | #endif | |
62f29da7 | 61 | mov %o0, %g6 /* IEU0 Group */ |
ae6b8730 RH |
62 | or %g1, %lo(0x01010101), %g1 /* IEU1 */ |
63 | ||
64 | andcc %o0, 7, %g0 /* IEU1 Group */ | |
65 | sllx %g1, 32, %g2 /* IEU0 */ | |
66 | bne,pn %icc, 26f /* CTI */ | |
67 | or %g1, %g2, %g1 /* IEU0 Group */ | |
68 | ||
69 | andcc %o1, 7, %g3 /* IEU1 */ | |
70 | bne,pn %icc, 28f /* CTI */ | |
71 | sllx %g1, 7, %g2 /* IEU0 Group */ | |
72 | ldx [%o1], %o3 /* Load */ | |
73 | ||
74 | 1: add %o1, 8, %o1 /* IEU1 */ | |
75 | 2: subcc %o2, 8, %o2 /* IEU1 Group */ | |
76 | bl,pn %XCC, 18f /* CTI */ | |
77 | sub %o3, %g1, %o4 /* IEU0 */ | |
78 | ||
79 | add %o0, 8, %o0 /* IEU0 Group */ | |
80 | #ifdef EIGHTBIT_NOT_MORE | |
81 | andn %o4, %o3, %o4 /* IEU1 */ | |
82 | #endif | |
83 | mov %o3, %g3 /* IEU1 */ | |
84 | ldxa [%o1] ASI_PNF, %o3 /* Load */ | |
85 | add %o1, 8, %o1 /* IEU0 Group */ | |
86 | ||
87 | andcc %o4, %g2, %g0 /* IEU1 */ | |
88 | be,a,pt %xcc, 2b /* CTI */ | |
89 | stx %g3, [%o0-8] /* Store Group */ | |
90 | srlx %g3, 56, %g5 /* IEU0 Group */ | |
91 | ||
92 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
93 | be,pn %icc, 16f /* CTI */ | |
94 | srlx %g3, 48, %g4 /* IEU0 */ | |
95 | andcc %g4, 0xff, %g0 /* IEU1 Group */ | |
96 | ||
97 | be,pn %icc, 15f /* CTI */ | |
98 | srlx %g3, 40, %g5 /* IEU0 */ | |
99 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
100 | be,pn %icc, 14f /* CTI */ | |
101 | ||
102 | srlx %g3, 32, %g4 /* IEU0 */ | |
103 | andcc %g4, 0xff, %g0 /* IEU1 Group */ | |
104 | be,pn %icc, 13f /* CTI */ | |
105 | srlx %g3, 24, %g5 /* IEU0 */ | |
106 | ||
107 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
108 | be,pn %icc, 12f /* CTI */ | |
109 | srlx %g3, 16, %g4 /* IEU0 */ | |
110 | andcc %g4, 0xff, %g0 /* IEU1 Group */ | |
111 | ||
112 | be,pn %icc, 11f /* CTI */ | |
113 | srlx %g3, 8, %g5 /* IEU0 */ | |
114 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
115 | be,pn %icc, 10f /* CTI */ | |
116 | ||
117 | andcc %g3, 0xff, %g0 /* IEU1 Group */ | |
118 | bne,pt %icc, 2b /* CTI */ | |
119 | 3: stx %g3, [%o0-8] /* Store */ | |
120 | andncc %o2, 31, %g3 /* IEU1 Group */ | |
121 | ||
122 | 4: be,pn %XCC, 41f /* CTI */ | |
123 | and %o2, 31, %o2 /* IEU1 Group */ | |
124 | 40: stx %g0, [%o0] /* Store */ | |
125 | stx %g0, [%o0 + 8] /* Store Group */ | |
126 | ||
127 | subcc %g3, 32, %g3 /* IEU1 */ | |
128 | stx %g0, [%o0 + 16] /* Store Group */ | |
129 | stx %g0, [%o0 + 24] /* Store Group */ | |
130 | bne,pt %XCC, 40b /* CTI */ | |
131 | ||
132 | add %o0, 32, %o0 /* IEU0 */ | |
133 | 41: subcc %o2, 8, %o2 /* IEU1 Group */ | |
134 | bl,a,pn %XCC, 6f /* CTI */ | |
135 | andcc %o2, 4, %g0 /* IEU1 Group */ | |
136 | ||
137 | 5: stx %g0, [%o0] /* Store */ | |
138 | subcc %o2, 8, %o2 /* IEU1 Group */ | |
139 | bge,pt %XCC, 5b /* CTI */ | |
140 | add %o0, 8, %o0 /* IEU0 */ | |
141 | ||
142 | andcc %o2, 4, %g0 /* IEU1 Group */ | |
143 | 6: be,a,pn %icc, 7f /* CTI */ | |
144 | andcc %o2, 2, %g0 /* IEU1 Group */ | |
145 | stw %g0, [%o0] /* Store */ | |
146 | ||
147 | add %o0, 4, %o0 /* IEU0 */ | |
148 | andcc %o2, 2, %g0 /* IEU1 Group */ | |
149 | 7: be,a,pn %icc, 8f /* CTI */ | |
150 | andcc %o2, 1, %g0 /* IEU1 Group */ | |
151 | ||
152 | sth %g0, [%o0] /* Store */ | |
153 | add %o0, 2, %o0 /* IEU0 */ | |
154 | andcc %o2, 1, %g0 /* IEU1 Group */ | |
155 | 8: bne,a,pn %icc, 9f /* CTI */ | |
156 | ||
157 | stb %g0, [%o0] /* Store */ | |
158 | 9: retl /* CTI+IEU1 Group */ | |
62f29da7 | 159 | mov %g6, %o0 /* IEU0 */ |
ae6b8730 RH |
160 | |
161 | .align 16 | |
162 | 10: ba,pt %xcc, 3b /* CTI */ | |
163 | sllx %g5, 8, %g3 /* IEU0 */ | |
164 | 11: ba,pt %xcc, 3b /* CTI Group */ | |
165 | sllx %g4, 16, %g3 /* IEU0 */ | |
166 | ||
167 | 12: ba,pt %xcc, 3b /* CTI Group */ | |
168 | sllx %g5, 24, %g3 /* IEU0 */ | |
169 | 13: ba,pt %xcc, 3b /* CTI Group */ | |
170 | sllx %g4, 32, %g3 /* IEU0 */ | |
171 | ||
172 | 14: ba,pt %xcc, 3b /* CTI Group */ | |
173 | sllx %g5, 40, %g3 /* IEU0 */ | |
174 | 15: ba,pt %xcc, 3b /* CTI Group */ | |
175 | sllx %g4, 48, %g3 /* IEU0 */ | |
176 | ||
177 | 16: ba,pt %xcc, 3b /* CTI */ | |
178 | sllx %g5, 56, %g3 /* IEU0 */ | |
179 | 17: or %o3, %o4, %o3 /* IEU0 Group */ | |
180 | sub %o3, %g1, %o4 /* IEU1 */ | |
181 | ||
182 | 18: addcc %o2, 8, %o2 /* IEU1 Group */ | |
183 | be,pn %XCC, 19f /* CTI */ | |
184 | andcc %o4, %g2, %g0 /* IEU1 Group */ | |
185 | be,pt %xcc, 21f /* CTI */ | |
186 | ||
187 | srlx %o3, 56, %g5 /* IEU0 */ | |
188 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
189 | be,pn %icc, 20f /* CTI */ | |
190 | stb %g5, [%o0] /* Store */ | |
191 | ||
192 | add %o0, 1, %o0 /* IEU0 Group */ | |
193 | subcc %o2, 1, %o2 /* IEU1 */ | |
194 | be,pn %XCC, 19f /* CTI */ | |
195 | srlx %o3, 48, %g5 /* IEU0 Group */ | |
196 | ||
197 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
198 | be,pn %icc, 20f /* CTI */ | |
199 | stb %g5, [%o0] /* Store */ | |
200 | add %o0, 1, %o0 /* IEU0 Group */ | |
201 | ||
202 | subcc %o2, 1, %o2 /* IEU1 */ | |
203 | be,pn %XCC, 19f /* CTI */ | |
204 | srlx %o3, 40, %g5 /* IEU0 Group */ | |
205 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
206 | ||
207 | be,pn %icc, 20f /* CTI */ | |
208 | stb %g5, [%o0] /* Store */ | |
209 | add %o0, 1, %o0 /* IEU0 Group */ | |
210 | subcc %o2, 1, %o2 /* IEU1 */ | |
211 | ||
212 | be,pn %XCC, 19f /* CTI */ | |
213 | srlx %o3, 32, %g5 /* IEU0 Group */ | |
214 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
215 | be,pn %icc, 20f /* CTI */ | |
216 | ||
217 | stb %g5, [%o0] /* Store */ | |
218 | add %o0, 1, %o0 /* IEU0 Group */ | |
219 | subcc %o2, 1, %o2 /* IEU1 */ | |
220 | be,pn %XCC, 19f /* CTI */ | |
221 | ||
222 | srlx %o3, 24, %g5 /* IEU0 Group */ | |
223 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
224 | be,pn %icc, 20f /* CTI */ | |
225 | stb %g5, [%o0] /* Store */ | |
226 | ||
227 | add %o0, 1, %o0 /* IEU0 Group */ | |
228 | subcc %o2, 1, %o2 /* IEU1 */ | |
229 | be,pn %XCC, 19f /* CTI */ | |
230 | srlx %o3, 16, %g5 /* IEU0 Group */ | |
231 | ||
232 | andcc %g5, 0xff, %g0 /* IEU1 Group */ | |
233 | be,pn %icc, 20f /* CTI */ | |
234 | stb %g5, [%o0] /* Store */ | |
235 | add %o0, 1, %o0 /* IEU0 Group */ | |
236 | ||
237 | subcc %o2, 1, %o2 /* IEU1 */ | |
238 | be,pn %XCC, 19f /* CTI */ | |
239 | srlx %o3, 8, %g5 /* IEU0 Group */ | |
240 | stb %g5, [%o0] /* Store */ | |
241 | ||
242 | 19: retl /* CTI+IEU1 Group */ | |
62f29da7 | 243 | mov %g6, %o0 /* IEU0 */ |
ae6b8730 RH |
244 | 50: stb %g0, [%o0] /* Store Group */ |
245 | 20: subcc %o2, 1, %o2 /* IEU1 Group */ | |
246 | ||
247 | bne,pt %XCC, 50b /* CTI */ | |
248 | add %o0, 1, %o0 /* IEU0 */ | |
249 | retl /* CTI+IEU1 Group */ | |
62f29da7 | 250 | mov %g6, %o0 /* IEU0 */ |
ae6b8730 RH |
251 | |
252 | 21: andcc %o2, 4, %g0 /* IEU1 Group */ | |
253 | be,pn %icc, 22f /* CTI */ | |
254 | srlx %o3, 32, %g5 /* IEU0 */ | |
255 | stw %g5, [%o0] /* Store Group */ | |
256 | ||
257 | add %o0, 4, %o0 /* IEU0 */ | |
258 | mov %o3, %g5 /* IEU1 */ | |
259 | 22: andcc %o2, 2, %g0 /* IEU1 Group */ | |
260 | be,pn %icc, 23f /* CTI */ | |
261 | ||
262 | srlx %g5, 16, %g4 /* IEU0 */ | |
263 | sth %g4, [%o0] /* Store Group */ | |
264 | add %o0, 2, %o0 /* IEU0 */ | |
265 | mov %g5, %g4 /* IEU1 */ | |
266 | ||
267 | 23: srlx %g4, 8, %g4 /* IEU0 Group */ | |
268 | andcc %o2, 1, %g0 /* IEU1 */ | |
269 | bne,a,pn %icc, 24f /* CTI */ | |
270 | stb %g4, [%o0] /* Store Group */ | |
271 | ||
272 | 24: retl /* CTI+IEU1 Group */ | |
62f29da7 | 273 | mov %g6, %o0 /* IEU0 */ |
ae6b8730 RH |
274 | 25: andcc %o0, 7, %g0 /* IEU1 Group */ |
275 | be,a,pn %icc, 4b /* CTI */ | |
276 | ||
277 | andncc %o2, 31, %g3 /* IEU1 Group */ | |
278 | stb %g0, [%o0] /* Store Group */ | |
279 | subcc %o2, 1, %o2 /* IEU1 */ | |
280 | bne,pt %XCC, 25b /* CTI */ | |
281 | ||
282 | add %o0, 1, %o0 /* IEU0 Group */ | |
283 | retl /* CTI+IEU1 Group */ | |
62f29da7 | 284 | mov %g6, %o0 /* IEU0 */ |
ae6b8730 RH |
285 | |
286 | .align 16 | |
287 | 26: ldub [%o1], %o3 /* Load */ | |
288 | sllx %g1, 7, %g2 /* IEU0 Group */ | |
289 | stb %o3, [%o0] /* Store */ | |
290 | 27: subcc %o2, 1, %o2 /* IEU1 */ | |
291 | ||
292 | be,pn %XCC, 9b /* CTI */ | |
293 | add %o1, 1, %o1 /* IEU0 Group */ | |
294 | add %o0, 1, %o0 /* IEU1 */ | |
295 | andcc %o3, 0xff, %g0 /* IEU1 Group */ | |
296 | ||
297 | be,pn %icc, 25b /* CTI */ | |
298 | lduba [%o1] ASI_PNF, %o3 /* Load */ | |
299 | andcc %o0, 7, %g0 /* IEU1 Group */ | |
300 | bne,a,pt %icc, 27b /* CTI */ | |
301 | ||
302 | stb %o3, [%o0] /* Store */ | |
303 | andcc %o1, 7, %g3 /* IEU1 Group */ | |
304 | be,a,pt %icc, 1b /* CTI */ | |
305 | ldx [%o1], %o3 /* Load */ | |
306 | ||
307 | 28: orcc %g0, 64, %g4 /* IEU1 Group */ | |
308 | sllx %g3, 3, %g5 /* IEU0 */ | |
309 | sub %g4, %g5, %g4 /* IEU0 Group */ | |
310 | sub %o1, %g3, %o1 /* IEU1 */ | |
311 | /* %g1 = 0101010101010101 | |
312 | %g2 = 8080808080808080 | |
313 | %g3 = source alignment | |
314 | %g5 = number of bits to shift left | |
315 | %g4 = number of bits to shift right */ | |
316 | ||
317 | ldxa [%o1] ASI_PNF, %o5 /* Load Group */ | |
318 | addcc %o1, 8, %o1 /* IEU1 */ | |
319 | ||
320 | 29: sllx %o5, %g5, %o3 /* IEU0 Group */ | |
321 | ldxa [%o1] ASI_PNF, %o5 /* Load */ | |
322 | subcc %o2, 8, %o2 /* IEU1 */ | |
323 | bl,pn %XCC, 17b /* CTI */ | |
324 | ||
325 | srlx %o5, %g4, %o4 /* IEU0 Group */ | |
326 | add %o1, 8, %o1 /* IEU1 */ | |
327 | or %o3, %o4, %o3 /* IEU0 Group */ | |
328 | add %o0, 8, %o0 /* IEU1 */ | |
329 | ||
330 | sub %o3, %g1, %o4 /* IEU0 Group */ | |
331 | #ifdef EIGHTBIT_NOT_RARE | |
332 | andn %o4, %o3, %o4 /* IEU0 Group */ | |
333 | #endif | |
334 | andcc %o4, %g2, %g0 /* IEU1 Group */ | |
335 | be,a,pt %xcc, 29b /* CTI */ | |
336 | stx %o3, [%o0-8] /* Store */ | |
337 | ||
338 | srlx %o3, 56, %o4 /* IEU0 Group */ | |
339 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
340 | be,pn %icc, 36f /* CTI */ | |
341 | srlx %o3, 48, %o4 /* IEU0 */ | |
342 | ||
343 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
344 | be,pn %icc, 35f /* CTI */ | |
345 | srlx %o3, 40, %o4 /* IEU0 */ | |
346 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
347 | ||
348 | be,pn %icc, 34f /* CTI */ | |
349 | srlx %o3, 32, %o4 /* IEU0 */ | |
350 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
351 | be,pn %icc, 33f /* CTI */ | |
352 | ||
353 | srlx %o3, 24, %o4 /* IEU0 */ | |
354 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
355 | be,pn %icc, 32f /* CTI */ | |
356 | srlx %o3, 16, %o4 /* IEU0 */ | |
357 | ||
358 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
359 | be,pn %icc, 31f /* CTI */ | |
360 | srlx %o3, 8, %o4 /* IEU0 */ | |
361 | andcc %o4, 0xff, %g0 /* IEU1 Group */ | |
362 | ||
363 | be,pn %icc, 30f /* CTI */ | |
364 | andcc %o3, 0xff, %g0 /* IEU1 Group */ | |
365 | bne,pn %icc, 29b /* CTI */ | |
366 | stx %o3, [%o0-8] /* Store */ | |
367 | ||
368 | ba,pt %xcc, 4b /* CTI Group */ | |
369 | andncc %o2, 31, %g3 /* IEU1 */ | |
370 | 30: srlx %o3, 8, %o4 /* IEU0 */ | |
371 | ba,pt %xcc, 3b /* CTI */ | |
372 | ||
373 | sllx %o4, 8, %g3 /* IEU0 Group */ | |
374 | 31: srlx %o3, 16, %o4 /* IEU0 Group */ | |
375 | ba,pt %xcc, 3b /* CTI */ | |
376 | sllx %o4, 16, %g3 /* IEU0 Group */ | |
377 | ||
378 | 32: srlx %o3, 24, %o4 /* IEU0 Group */ | |
379 | ba,pt %xcc, 3b /* CTI */ | |
380 | sllx %o4, 24, %g3 /* IEU0 Group */ | |
381 | 33: srlx %o3, 32, %o4 /* IEU0 Group */ | |
382 | ||
383 | ba,pt %xcc, 3b /* CTI */ | |
384 | sllx %o4, 32, %g3 /* IEU0 Group */ | |
385 | 34: srlx %o3, 40, %o4 /* IEU0 Group */ | |
386 | ba,pt %xcc, 3b /* CTI */ | |
387 | ||
388 | sllx %o4, 40, %g3 /* IEU0 Group */ | |
389 | 35: srlx %o3, 48, %o4 /* IEU0 Group */ | |
390 | ba,pt %xcc, 3b /* CTI */ | |
391 | sllx %o4, 48, %g3 /* IEU0 Group */ | |
392 | ||
393 | 36: srlx %o3, 56, %o4 /* IEU0 Group */ | |
394 | ba,pt %xcc, 3b /* CTI */ | |
395 | sllx %o4, 56, %g3 /* IEU0 Group */ | |
396 | END(strncpy) | |
85dd1003 | 397 | libc_hidden_builtin_def (strncpy) |