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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/memcpy.S | |
3 | * | |
4 | * Copyright (C) 1995-1999 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * ASM optimised string functions | |
11 | */ | |
12 | #include <linux/linkage.h> | |
13 | #include <asm/assembler.h> | |
14 | ||
15 | .text | |
16 | ||
17 | #define ENTER \ | |
18 | mov ip,sp ;\ | |
19 | stmfd sp!,{r0,r4-r9,fp,ip,lr,pc} ;\ | |
20 | sub fp,ip,#4 | |
21 | ||
22 | #define EXIT \ | |
23 | LOADREGS(ea, fp, {r0, r4 - r9, fp, sp, pc}) | |
24 | ||
25 | #define EXITEQ \ | |
26 | LOADREGS(eqea, fp, {r0, r4 - r9, fp, sp, pc}) | |
27 | ||
28 | /* | |
29 | * Prototype: void memcpy(void *to,const void *from,unsigned long n); | |
30 | */ | |
31 | ENTRY(memcpy) | |
32 | ENTRY(memmove) | |
33 | ENTER | |
34 | cmp r1, r0 | |
35 | bcc 23f | |
36 | subs r2, r2, #4 | |
37 | blt 6f | |
38 | PLD( pld [r1, #0] ) | |
39 | ands ip, r0, #3 | |
40 | bne 7f | |
41 | ands ip, r1, #3 | |
42 | bne 8f | |
43 | ||
44 | 1: subs r2, r2, #8 | |
45 | blt 5f | |
46 | subs r2, r2, #20 | |
47 | blt 4f | |
48 | PLD( pld [r1, #28] ) | |
49 | PLD( subs r2, r2, #64 ) | |
50 | PLD( blt 3f ) | |
51 | 2: PLD( pld [r1, #60] ) | |
52 | PLD( pld [r1, #92] ) | |
53 | ldmia r1!, {r3 - r9, ip} | |
54 | subs r2, r2, #32 | |
55 | stmgeia r0!, {r3 - r9, ip} | |
56 | ldmgeia r1!, {r3 - r9, ip} | |
57 | subges r2, r2, #32 | |
58 | stmia r0!, {r3 - r9, ip} | |
59 | bge 2b | |
60 | 3: PLD( ldmia r1!, {r3 - r9, ip} ) | |
61 | PLD( adds r2, r2, #32 ) | |
62 | PLD( stmgeia r0!, {r3 - r9, ip} ) | |
63 | PLD( ldmgeia r1!, {r3 - r9, ip} ) | |
64 | PLD( subges r2, r2, #32 ) | |
65 | PLD( stmia r0!, {r3 - r9, ip} ) | |
66 | 4: cmn r2, #16 | |
67 | ldmgeia r1!, {r3 - r6} | |
68 | subge r2, r2, #16 | |
69 | stmgeia r0!, {r3 - r6} | |
70 | adds r2, r2, #20 | |
71 | ldmgeia r1!, {r3 - r5} | |
72 | subge r2, r2, #12 | |
73 | stmgeia r0!, {r3 - r5} | |
74 | 5: adds r2, r2, #8 | |
75 | blt 6f | |
76 | subs r2, r2, #4 | |
77 | ldrlt r3, [r1], #4 | |
78 | ldmgeia r1!, {r4, r5} | |
79 | subge r2, r2, #4 | |
80 | strlt r3, [r0], #4 | |
81 | stmgeia r0!, {r4, r5} | |
82 | ||
83 | 6: adds r2, r2, #4 | |
84 | EXITEQ | |
85 | cmp r2, #2 | |
86 | ldrb r3, [r1], #1 | |
87 | ldrgeb r4, [r1], #1 | |
88 | ldrgtb r5, [r1], #1 | |
89 | strb r3, [r0], #1 | |
90 | strgeb r4, [r0], #1 | |
91 | strgtb r5, [r0], #1 | |
92 | EXIT | |
93 | ||
94 | 7: rsb ip, ip, #4 | |
95 | cmp ip, #2 | |
96 | ldrb r3, [r1], #1 | |
97 | ldrgeb r4, [r1], #1 | |
98 | ldrgtb r5, [r1], #1 | |
99 | strb r3, [r0], #1 | |
100 | strgeb r4, [r0], #1 | |
101 | strgtb r5, [r0], #1 | |
102 | subs r2, r2, ip | |
103 | blt 6b | |
104 | ands ip, r1, #3 | |
105 | beq 1b | |
106 | ||
107 | 8: bic r1, r1, #3 | |
108 | ldr r7, [r1], #4 | |
109 | cmp ip, #2 | |
110 | bgt 18f | |
111 | beq 13f | |
112 | cmp r2, #12 | |
113 | blt 11f | |
114 | PLD( pld [r1, #12] ) | |
115 | sub r2, r2, #12 | |
116 | PLD( subs r2, r2, #32 ) | |
117 | PLD( blt 10f ) | |
118 | PLD( pld [r1, #28] ) | |
119 | 9: PLD( pld [r1, #44] ) | |
120 | 10: mov r3, r7, pull #8 | |
121 | ldmia r1!, {r4 - r7} | |
122 | subs r2, r2, #16 | |
123 | orr r3, r3, r4, push #24 | |
124 | mov r4, r4, pull #8 | |
125 | orr r4, r4, r5, push #24 | |
126 | mov r5, r5, pull #8 | |
127 | orr r5, r5, r6, push #24 | |
128 | mov r6, r6, pull #8 | |
129 | orr r6, r6, r7, push #24 | |
130 | stmia r0!, {r3 - r6} | |
131 | bge 9b | |
132 | PLD( cmn r2, #32 ) | |
133 | PLD( bge 10b ) | |
134 | PLD( add r2, r2, #32 ) | |
135 | adds r2, r2, #12 | |
136 | blt 12f | |
137 | 11: mov r3, r7, pull #8 | |
138 | ldr r7, [r1], #4 | |
139 | subs r2, r2, #4 | |
140 | orr r3, r3, r7, push #24 | |
141 | str r3, [r0], #4 | |
142 | bge 11b | |
143 | 12: sub r1, r1, #3 | |
144 | b 6b | |
145 | ||
146 | 13: cmp r2, #12 | |
147 | blt 16f | |
148 | PLD( pld [r1, #12] ) | |
149 | sub r2, r2, #12 | |
150 | PLD( subs r2, r2, #32 ) | |
151 | PLD( blt 15f ) | |
152 | PLD( pld [r1, #28] ) | |
153 | 14: PLD( pld [r1, #44] ) | |
154 | 15: mov r3, r7, pull #16 | |
155 | ldmia r1!, {r4 - r7} | |
156 | subs r2, r2, #16 | |
157 | orr r3, r3, r4, push #16 | |
158 | mov r4, r4, pull #16 | |
159 | orr r4, r4, r5, push #16 | |
160 | mov r5, r5, pull #16 | |
161 | orr r5, r5, r6, push #16 | |
162 | mov r6, r6, pull #16 | |
163 | orr r6, r6, r7, push #16 | |
164 | stmia r0!, {r3 - r6} | |
165 | bge 14b | |
166 | PLD( cmn r2, #32 ) | |
167 | PLD( bge 15b ) | |
168 | PLD( add r2, r2, #32 ) | |
169 | adds r2, r2, #12 | |
170 | blt 17f | |
171 | 16: mov r3, r7, pull #16 | |
172 | ldr r7, [r1], #4 | |
173 | subs r2, r2, #4 | |
174 | orr r3, r3, r7, push #16 | |
175 | str r3, [r0], #4 | |
176 | bge 16b | |
177 | 17: sub r1, r1, #2 | |
178 | b 6b | |
179 | ||
180 | 18: cmp r2, #12 | |
181 | blt 21f | |
182 | PLD( pld [r1, #12] ) | |
183 | sub r2, r2, #12 | |
184 | PLD( subs r2, r2, #32 ) | |
185 | PLD( blt 20f ) | |
186 | PLD( pld [r1, #28] ) | |
187 | 19: PLD( pld [r1, #44] ) | |
188 | 20: mov r3, r7, pull #24 | |
189 | ldmia r1!, {r4 - r7} | |
190 | subs r2, r2, #16 | |
191 | orr r3, r3, r4, push #8 | |
192 | mov r4, r4, pull #24 | |
193 | orr r4, r4, r5, push #8 | |
194 | mov r5, r5, pull #24 | |
195 | orr r5, r5, r6, push #8 | |
196 | mov r6, r6, pull #24 | |
197 | orr r6, r6, r7, push #8 | |
198 | stmia r0!, {r3 - r6} | |
199 | bge 19b | |
200 | PLD( cmn r2, #32 ) | |
201 | PLD( bge 20b ) | |
202 | PLD( add r2, r2, #32 ) | |
203 | adds r2, r2, #12 | |
204 | blt 22f | |
205 | 21: mov r3, r7, pull #24 | |
206 | ldr r7, [r1], #4 | |
207 | subs r2, r2, #4 | |
208 | orr r3, r3, r7, push #8 | |
209 | str r3, [r0], #4 | |
210 | bge 21b | |
211 | 22: sub r1, r1, #1 | |
212 | b 6b | |
213 | ||
214 | ||
215 | 23: add r1, r1, r2 | |
216 | add r0, r0, r2 | |
217 | subs r2, r2, #4 | |
218 | blt 29f | |
219 | PLD( pld [r1, #-4] ) | |
220 | ands ip, r0, #3 | |
221 | bne 30f | |
222 | ands ip, r1, #3 | |
223 | bne 31f | |
224 | ||
225 | 24: subs r2, r2, #8 | |
226 | blt 28f | |
227 | subs r2, r2, #20 | |
228 | blt 27f | |
229 | PLD( pld [r1, #-32] ) | |
230 | PLD( subs r2, r2, #64 ) | |
231 | PLD( blt 26f ) | |
232 | 25: PLD( pld [r1, #-64] ) | |
233 | PLD( pld [r1, #-96] ) | |
234 | ldmdb r1!, {r3 - r9, ip} | |
235 | subs r2, r2, #32 | |
236 | stmgedb r0!, {r3 - r9, ip} | |
237 | ldmgedb r1!, {r3 - r9, ip} | |
238 | subges r2, r2, #32 | |
239 | stmdb r0!, {r3 - r9, ip} | |
240 | bge 25b | |
241 | 26: PLD( ldmdb r1!, {r3 - r9, ip} ) | |
242 | PLD( adds r2, r2, #32 ) | |
243 | PLD( stmgedb r0!, {r3 - r9, ip} ) | |
244 | PLD( ldmgedb r1!, {r3 - r9, ip} ) | |
245 | PLD( subges r2, r2, #32 ) | |
246 | PLD( stmdb r0!, {r3 - r9, ip} ) | |
247 | 27: cmn r2, #16 | |
248 | ldmgedb r1!, {r3 - r6} | |
249 | subge r2, r2, #16 | |
250 | stmgedb r0!, {r3 - r6} | |
251 | adds r2, r2, #20 | |
252 | ldmgedb r1!, {r3 - r5} | |
253 | subge r2, r2, #12 | |
254 | stmgedb r0!, {r3 - r5} | |
255 | 28: adds r2, r2, #8 | |
256 | blt 29f | |
257 | subs r2, r2, #4 | |
258 | ldrlt r3, [r1, #-4]! | |
259 | ldmgedb r1!, {r4, r5} | |
260 | subge r2, r2, #4 | |
261 | strlt r3, [r0, #-4]! | |
262 | stmgedb r0!, {r4, r5} | |
263 | ||
264 | 29: adds r2, r2, #4 | |
265 | EXITEQ | |
266 | cmp r2, #2 | |
267 | ldrb r3, [r1, #-1]! | |
268 | ldrgeb r4, [r1, #-1]! | |
269 | ldrgtb r5, [r1, #-1]! | |
270 | strb r3, [r0, #-1]! | |
271 | strgeb r4, [r0, #-1]! | |
272 | strgtb r5, [r0, #-1]! | |
273 | EXIT | |
274 | ||
275 | 30: cmp ip, #2 | |
276 | ldrb r3, [r1, #-1]! | |
277 | ldrgeb r4, [r1, #-1]! | |
278 | ldrgtb r5, [r1, #-1]! | |
279 | strb r3, [r0, #-1]! | |
280 | strgeb r4, [r0, #-1]! | |
281 | strgtb r5, [r0, #-1]! | |
282 | subs r2, r2, ip | |
283 | blt 29b | |
284 | ands ip, r1, #3 | |
285 | beq 24b | |
286 | ||
287 | 31: bic r1, r1, #3 | |
288 | ldr r3, [r1], #0 | |
289 | cmp ip, #2 | |
290 | blt 41f | |
291 | beq 36f | |
292 | cmp r2, #12 | |
293 | blt 34f | |
294 | PLD( pld [r1, #-16] ) | |
295 | sub r2, r2, #12 | |
296 | PLD( subs r2, r2, #32 ) | |
297 | PLD( blt 33f ) | |
298 | PLD( pld [r1, #-32] ) | |
299 | 32: PLD( pld [r1, #-48] ) | |
300 | 33: mov r7, r3, push #8 | |
301 | ldmdb r1!, {r3, r4, r5, r6} | |
302 | subs r2, r2, #16 | |
303 | orr r7, r7, r6, pull #24 | |
304 | mov r6, r6, push #8 | |
305 | orr r6, r6, r5, pull #24 | |
306 | mov r5, r5, push #8 | |
307 | orr r5, r5, r4, pull #24 | |
308 | mov r4, r4, push #8 | |
309 | orr r4, r4, r3, pull #24 | |
310 | stmdb r0!, {r4, r5, r6, r7} | |
311 | bge 32b | |
312 | PLD( cmn r2, #32 ) | |
313 | PLD( bge 33b ) | |
314 | PLD( add r2, r2, #32 ) | |
315 | adds r2, r2, #12 | |
316 | blt 35f | |
317 | 34: mov ip, r3, push #8 | |
318 | ldr r3, [r1, #-4]! | |
319 | subs r2, r2, #4 | |
320 | orr ip, ip, r3, pull #24 | |
321 | str ip, [r0, #-4]! | |
322 | bge 34b | |
323 | 35: add r1, r1, #3 | |
324 | b 29b | |
325 | ||
326 | 36: cmp r2, #12 | |
327 | blt 39f | |
328 | PLD( pld [r1, #-16] ) | |
329 | sub r2, r2, #12 | |
330 | PLD( subs r2, r2, #32 ) | |
331 | PLD( blt 38f ) | |
332 | PLD( pld [r1, #-32] ) | |
333 | 37: PLD( pld [r1, #-48] ) | |
334 | 38: mov r7, r3, push #16 | |
335 | ldmdb r1!, {r3, r4, r5, r6} | |
336 | subs r2, r2, #16 | |
337 | orr r7, r7, r6, pull #16 | |
338 | mov r6, r6, push #16 | |
339 | orr r6, r6, r5, pull #16 | |
340 | mov r5, r5, push #16 | |
341 | orr r5, r5, r4, pull #16 | |
342 | mov r4, r4, push #16 | |
343 | orr r4, r4, r3, pull #16 | |
344 | stmdb r0!, {r4, r5, r6, r7} | |
345 | bge 37b | |
346 | PLD( cmn r2, #32 ) | |
347 | PLD( bge 38b ) | |
348 | PLD( add r2, r2, #32 ) | |
349 | adds r2, r2, #12 | |
350 | blt 40f | |
351 | 39: mov ip, r3, push #16 | |
352 | ldr r3, [r1, #-4]! | |
353 | subs r2, r2, #4 | |
354 | orr ip, ip, r3, pull #16 | |
355 | str ip, [r0, #-4]! | |
356 | bge 39b | |
357 | 40: add r1, r1, #2 | |
358 | b 29b | |
359 | ||
360 | 41: cmp r2, #12 | |
361 | blt 44f | |
362 | PLD( pld [r1, #-16] ) | |
363 | sub r2, r2, #12 | |
364 | PLD( subs r2, r2, #32 ) | |
365 | PLD( blt 43f ) | |
366 | PLD( pld [r1, #-32] ) | |
367 | 42: PLD( pld [r1, #-48] ) | |
368 | 43: mov r7, r3, push #24 | |
369 | ldmdb r1!, {r3, r4, r5, r6} | |
370 | subs r2, r2, #16 | |
371 | orr r7, r7, r6, pull #8 | |
372 | mov r6, r6, push #24 | |
373 | orr r6, r6, r5, pull #8 | |
374 | mov r5, r5, push #24 | |
375 | orr r5, r5, r4, pull #8 | |
376 | mov r4, r4, push #24 | |
377 | orr r4, r4, r3, pull #8 | |
378 | stmdb r0!, {r4, r5, r6, r7} | |
379 | bge 42b | |
380 | PLD( cmn r2, #32 ) | |
381 | PLD( bge 43b ) | |
382 | PLD( add r2, r2, #32 ) | |
383 | adds r2, r2, #12 | |
384 | blt 45f | |
385 | 44: mov ip, r3, push #24 | |
386 | ldr r3, [r1, #-4]! | |
387 | subs r2, r2, #4 | |
388 | orr ip, ip, r3, pull #8 | |
389 | str ip, [r0, #-4]! | |
390 | bge 44b | |
391 | 45: add r1, r1, #1 | |
392 | b 29b | |
393 |