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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/uaccess.S | |
3 | * | |
4 | * Copyright (C) 1995, 1996,1997,1998 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 | * Routines to block copy data to/from user memory | |
11 | * These are highly optimised both for the 4k page size | |
12 | * and for various alignments. | |
13 | */ | |
14 | #include <linux/linkage.h> | |
15 | #include <asm/assembler.h> | |
16 | #include <asm/errno.h> | |
17 | ||
18 | .text | |
19 | ||
20 | #define PAGE_SHIFT 12 | |
21 | ||
22 | /* Prototype: int __arch_copy_to_user(void *to, const char *from, size_t n) | |
23 | * Purpose : copy a block to user memory from kernel memory | |
24 | * Params : to - user memory | |
25 | * : from - kernel memory | |
26 | * : n - number of bytes to copy | |
27 | * Returns : Number of bytes NOT copied. | |
28 | */ | |
29 | ||
30 | .c2u_dest_not_aligned: | |
31 | rsb ip, ip, #4 | |
32 | cmp ip, #2 | |
33 | ldrb r3, [r1], #1 | |
34 | USER( strbt r3, [r0], #1) @ May fault | |
35 | ldrgeb r3, [r1], #1 | |
36 | USER( strgebt r3, [r0], #1) @ May fault | |
37 | ldrgtb r3, [r1], #1 | |
38 | USER( strgtbt r3, [r0], #1) @ May fault | |
39 | sub r2, r2, ip | |
40 | b .c2u_dest_aligned | |
41 | ||
42 | ENTRY(__arch_copy_to_user) | |
43 | stmfd sp!, {r2, r4 - r7, lr} | |
44 | cmp r2, #4 | |
45 | blt .c2u_not_enough | |
46 | PLD( pld [r1, #0] ) | |
47 | PLD( pld [r0, #0] ) | |
48 | ands ip, r0, #3 | |
49 | bne .c2u_dest_not_aligned | |
50 | .c2u_dest_aligned: | |
51 | ||
52 | ands ip, r1, #3 | |
53 | bne .c2u_src_not_aligned | |
54 | /* | |
55 | * Seeing as there has to be at least 8 bytes to copy, we can | |
56 | * copy one word, and force a user-mode page fault... | |
57 | */ | |
58 | ||
59 | .c2u_0fupi: subs r2, r2, #4 | |
60 | addmi ip, r2, #4 | |
61 | bmi .c2u_0nowords | |
62 | ldr r3, [r1], #4 | |
63 | USER( strt r3, [r0], #4) @ May fault | |
64 | mov ip, r0, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction | |
65 | rsb ip, ip, #0 | |
66 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
67 | beq .c2u_0fupi | |
68 | /* | |
69 | * ip = max no. of bytes to copy before needing another "strt" insn | |
70 | */ | |
71 | cmp r2, ip | |
72 | movlt ip, r2 | |
73 | sub r2, r2, ip | |
74 | subs ip, ip, #32 | |
75 | blt .c2u_0rem8lp | |
76 | PLD( pld [r1, #28] ) | |
77 | PLD( pld [r0, #28] ) | |
78 | PLD( subs ip, ip, #64 ) | |
79 | PLD( blt .c2u_0cpynopld ) | |
80 | PLD( pld [r1, #60] ) | |
81 | PLD( pld [r0, #60] ) | |
82 | ||
83 | .c2u_0cpy8lp: | |
84 | PLD( pld [r1, #92] ) | |
85 | PLD( pld [r0, #92] ) | |
86 | .c2u_0cpynopld: ldmia r1!, {r3 - r6} | |
87 | stmia r0!, {r3 - r6} @ Shouldnt fault | |
88 | ldmia r1!, {r3 - r6} | |
89 | subs ip, ip, #32 | |
90 | stmia r0!, {r3 - r6} @ Shouldnt fault | |
91 | bpl .c2u_0cpy8lp | |
92 | PLD( cmn ip, #64 ) | |
93 | PLD( bge .c2u_0cpynopld ) | |
94 | PLD( add ip, ip, #64 ) | |
95 | ||
96 | .c2u_0rem8lp: cmn ip, #16 | |
97 | ldmgeia r1!, {r3 - r6} | |
98 | stmgeia r0!, {r3 - r6} @ Shouldnt fault | |
99 | tst ip, #8 | |
100 | ldmneia r1!, {r3 - r4} | |
101 | stmneia r0!, {r3 - r4} @ Shouldnt fault | |
102 | tst ip, #4 | |
103 | ldrne r3, [r1], #4 | |
104 | strnet r3, [r0], #4 @ Shouldnt fault | |
105 | ands ip, ip, #3 | |
106 | beq .c2u_0fupi | |
107 | .c2u_0nowords: teq ip, #0 | |
108 | beq .c2u_finished | |
109 | .c2u_nowords: cmp ip, #2 | |
110 | ldrb r3, [r1], #1 | |
111 | USER( strbt r3, [r0], #1) @ May fault | |
112 | ldrgeb r3, [r1], #1 | |
113 | USER( strgebt r3, [r0], #1) @ May fault | |
114 | ldrgtb r3, [r1], #1 | |
115 | USER( strgtbt r3, [r0], #1) @ May fault | |
116 | b .c2u_finished | |
117 | ||
118 | .c2u_not_enough: | |
119 | movs ip, r2 | |
120 | bne .c2u_nowords | |
121 | .c2u_finished: mov r0, #0 | |
122 | LOADREGS(fd,sp!,{r2, r4 - r7, pc}) | |
123 | ||
124 | .c2u_src_not_aligned: | |
125 | bic r1, r1, #3 | |
126 | ldr r7, [r1], #4 | |
127 | cmp ip, #2 | |
128 | bgt .c2u_3fupi | |
129 | beq .c2u_2fupi | |
130 | .c2u_1fupi: subs r2, r2, #4 | |
131 | addmi ip, r2, #4 | |
132 | bmi .c2u_1nowords | |
133 | mov r3, r7, pull #8 | |
134 | ldr r7, [r1], #4 | |
135 | orr r3, r3, r7, push #24 | |
136 | USER( strt r3, [r0], #4) @ May fault | |
137 | mov ip, r0, lsl #32 - PAGE_SHIFT | |
138 | rsb ip, ip, #0 | |
139 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
140 | beq .c2u_1fupi | |
141 | cmp r2, ip | |
142 | movlt ip, r2 | |
143 | sub r2, r2, ip | |
144 | subs ip, ip, #16 | |
145 | blt .c2u_1rem8lp | |
146 | PLD( pld [r1, #12] ) | |
147 | PLD( pld [r0, #12] ) | |
148 | PLD( subs ip, ip, #32 ) | |
149 | PLD( blt .c2u_1cpynopld ) | |
150 | PLD( pld [r1, #28] ) | |
151 | PLD( pld [r0, #28] ) | |
152 | ||
153 | .c2u_1cpy8lp: | |
154 | PLD( pld [r1, #44] ) | |
155 | PLD( pld [r0, #44] ) | |
156 | .c2u_1cpynopld: mov r3, r7, pull #8 | |
157 | ldmia r1!, {r4 - r7} | |
158 | subs ip, ip, #16 | |
159 | orr r3, r3, r4, push #24 | |
160 | mov r4, r4, pull #8 | |
161 | orr r4, r4, r5, push #24 | |
162 | mov r5, r5, pull #8 | |
163 | orr r5, r5, r6, push #24 | |
164 | mov r6, r6, pull #8 | |
165 | orr r6, r6, r7, push #24 | |
166 | stmia r0!, {r3 - r6} @ Shouldnt fault | |
167 | bpl .c2u_1cpy8lp | |
168 | PLD( cmn ip, #32 ) | |
169 | PLD( bge .c2u_1cpynopld ) | |
170 | PLD( add ip, ip, #32 ) | |
171 | ||
172 | .c2u_1rem8lp: tst ip, #8 | |
173 | movne r3, r7, pull #8 | |
174 | ldmneia r1!, {r4, r7} | |
175 | orrne r3, r3, r4, push #24 | |
176 | movne r4, r4, pull #8 | |
177 | orrne r4, r4, r7, push #24 | |
178 | stmneia r0!, {r3 - r4} @ Shouldnt fault | |
179 | tst ip, #4 | |
180 | movne r3, r7, pull #8 | |
181 | ldrne r7, [r1], #4 | |
182 | orrne r3, r3, r7, push #24 | |
183 | strnet r3, [r0], #4 @ Shouldnt fault | |
184 | ands ip, ip, #3 | |
185 | beq .c2u_1fupi | |
186 | .c2u_1nowords: mov r3, r7, get_byte_1 | |
187 | teq ip, #0 | |
188 | beq .c2u_finished | |
189 | cmp ip, #2 | |
190 | USER( strbt r3, [r0], #1) @ May fault | |
191 | movge r3, r7, get_byte_2 | |
192 | USER( strgebt r3, [r0], #1) @ May fault | |
193 | movgt r3, r7, get_byte_3 | |
194 | USER( strgtbt r3, [r0], #1) @ May fault | |
195 | b .c2u_finished | |
196 | ||
197 | .c2u_2fupi: subs r2, r2, #4 | |
198 | addmi ip, r2, #4 | |
199 | bmi .c2u_2nowords | |
200 | mov r3, r7, pull #16 | |
201 | ldr r7, [r1], #4 | |
202 | orr r3, r3, r7, push #16 | |
203 | USER( strt r3, [r0], #4) @ May fault | |
204 | mov ip, r0, lsl #32 - PAGE_SHIFT | |
205 | rsb ip, ip, #0 | |
206 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
207 | beq .c2u_2fupi | |
208 | cmp r2, ip | |
209 | movlt ip, r2 | |
210 | sub r2, r2, ip | |
211 | subs ip, ip, #16 | |
212 | blt .c2u_2rem8lp | |
213 | PLD( pld [r1, #12] ) | |
214 | PLD( pld [r0, #12] ) | |
215 | PLD( subs ip, ip, #32 ) | |
216 | PLD( blt .c2u_2cpynopld ) | |
217 | PLD( pld [r1, #28] ) | |
218 | PLD( pld [r0, #28] ) | |
219 | ||
220 | .c2u_2cpy8lp: | |
221 | PLD( pld [r1, #44] ) | |
222 | PLD( pld [r0, #44] ) | |
223 | .c2u_2cpynopld: mov r3, r7, pull #16 | |
224 | ldmia r1!, {r4 - r7} | |
225 | subs ip, ip, #16 | |
226 | orr r3, r3, r4, push #16 | |
227 | mov r4, r4, pull #16 | |
228 | orr r4, r4, r5, push #16 | |
229 | mov r5, r5, pull #16 | |
230 | orr r5, r5, r6, push #16 | |
231 | mov r6, r6, pull #16 | |
232 | orr r6, r6, r7, push #16 | |
233 | stmia r0!, {r3 - r6} @ Shouldnt fault | |
234 | bpl .c2u_2cpy8lp | |
235 | PLD( cmn ip, #32 ) | |
236 | PLD( bge .c2u_2cpynopld ) | |
237 | PLD( add ip, ip, #32 ) | |
238 | ||
239 | .c2u_2rem8lp: tst ip, #8 | |
240 | movne r3, r7, pull #16 | |
241 | ldmneia r1!, {r4, r7} | |
242 | orrne r3, r3, r4, push #16 | |
243 | movne r4, r4, pull #16 | |
244 | orrne r4, r4, r7, push #16 | |
245 | stmneia r0!, {r3 - r4} @ Shouldnt fault | |
246 | tst ip, #4 | |
247 | movne r3, r7, pull #16 | |
248 | ldrne r7, [r1], #4 | |
249 | orrne r3, r3, r7, push #16 | |
250 | strnet r3, [r0], #4 @ Shouldnt fault | |
251 | ands ip, ip, #3 | |
252 | beq .c2u_2fupi | |
253 | .c2u_2nowords: mov r3, r7, get_byte_2 | |
254 | teq ip, #0 | |
255 | beq .c2u_finished | |
256 | cmp ip, #2 | |
257 | USER( strbt r3, [r0], #1) @ May fault | |
258 | movge r3, r7, get_byte_3 | |
259 | USER( strgebt r3, [r0], #1) @ May fault | |
260 | ldrgtb r3, [r1], #0 | |
261 | USER( strgtbt r3, [r0], #1) @ May fault | |
262 | b .c2u_finished | |
263 | ||
264 | .c2u_3fupi: subs r2, r2, #4 | |
265 | addmi ip, r2, #4 | |
266 | bmi .c2u_3nowords | |
267 | mov r3, r7, pull #24 | |
268 | ldr r7, [r1], #4 | |
269 | orr r3, r3, r7, push #8 | |
270 | USER( strt r3, [r0], #4) @ May fault | |
271 | mov ip, r0, lsl #32 - PAGE_SHIFT | |
272 | rsb ip, ip, #0 | |
273 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
274 | beq .c2u_3fupi | |
275 | cmp r2, ip | |
276 | movlt ip, r2 | |
277 | sub r2, r2, ip | |
278 | subs ip, ip, #16 | |
279 | blt .c2u_3rem8lp | |
280 | PLD( pld [r1, #12] ) | |
281 | PLD( pld [r0, #12] ) | |
282 | PLD( subs ip, ip, #32 ) | |
283 | PLD( blt .c2u_3cpynopld ) | |
284 | PLD( pld [r1, #28] ) | |
285 | PLD( pld [r0, #28] ) | |
286 | ||
287 | .c2u_3cpy8lp: | |
288 | PLD( pld [r1, #44] ) | |
289 | PLD( pld [r0, #44] ) | |
290 | .c2u_3cpynopld: mov r3, r7, pull #24 | |
291 | ldmia r1!, {r4 - r7} | |
292 | subs ip, ip, #16 | |
293 | orr r3, r3, r4, push #8 | |
294 | mov r4, r4, pull #24 | |
295 | orr r4, r4, r5, push #8 | |
296 | mov r5, r5, pull #24 | |
297 | orr r5, r5, r6, push #8 | |
298 | mov r6, r6, pull #24 | |
299 | orr r6, r6, r7, push #8 | |
300 | stmia r0!, {r3 - r6} @ Shouldnt fault | |
301 | bpl .c2u_3cpy8lp | |
302 | PLD( cmn ip, #32 ) | |
303 | PLD( bge .c2u_3cpynopld ) | |
304 | PLD( add ip, ip, #32 ) | |
305 | ||
306 | .c2u_3rem8lp: tst ip, #8 | |
307 | movne r3, r7, pull #24 | |
308 | ldmneia r1!, {r4, r7} | |
309 | orrne r3, r3, r4, push #8 | |
310 | movne r4, r4, pull #24 | |
311 | orrne r4, r4, r7, push #8 | |
312 | stmneia r0!, {r3 - r4} @ Shouldnt fault | |
313 | tst ip, #4 | |
314 | movne r3, r7, pull #24 | |
315 | ldrne r7, [r1], #4 | |
316 | orrne r3, r3, r7, push #8 | |
317 | strnet r3, [r0], #4 @ Shouldnt fault | |
318 | ands ip, ip, #3 | |
319 | beq .c2u_3fupi | |
320 | .c2u_3nowords: mov r3, r7, get_byte_3 | |
321 | teq ip, #0 | |
322 | beq .c2u_finished | |
323 | cmp ip, #2 | |
324 | USER( strbt r3, [r0], #1) @ May fault | |
325 | ldrgeb r3, [r1], #1 | |
326 | USER( strgebt r3, [r0], #1) @ May fault | |
327 | ldrgtb r3, [r1], #0 | |
328 | USER( strgtbt r3, [r0], #1) @ May fault | |
329 | b .c2u_finished | |
330 | ||
331 | .section .fixup,"ax" | |
332 | .align 0 | |
333 | 9001: LOADREGS(fd,sp!, {r0, r4 - r7, pc}) | |
334 | .previous | |
335 | ||
336 | /* Prototype: unsigned long __arch_copy_from_user(void *to,const void *from,unsigned long n); | |
337 | * Purpose : copy a block from user memory to kernel memory | |
338 | * Params : to - kernel memory | |
339 | * : from - user memory | |
340 | * : n - number of bytes to copy | |
341 | * Returns : Number of bytes NOT copied. | |
342 | */ | |
343 | .cfu_dest_not_aligned: | |
344 | rsb ip, ip, #4 | |
345 | cmp ip, #2 | |
346 | USER( ldrbt r3, [r1], #1) @ May fault | |
347 | strb r3, [r0], #1 | |
348 | USER( ldrgebt r3, [r1], #1) @ May fault | |
349 | strgeb r3, [r0], #1 | |
350 | USER( ldrgtbt r3, [r1], #1) @ May fault | |
351 | strgtb r3, [r0], #1 | |
352 | sub r2, r2, ip | |
353 | b .cfu_dest_aligned | |
354 | ||
355 | ENTRY(__arch_copy_from_user) | |
356 | stmfd sp!, {r0, r2, r4 - r7, lr} | |
357 | cmp r2, #4 | |
358 | blt .cfu_not_enough | |
359 | PLD( pld [r1, #0] ) | |
360 | PLD( pld [r0, #0] ) | |
361 | ands ip, r0, #3 | |
362 | bne .cfu_dest_not_aligned | |
363 | .cfu_dest_aligned: | |
364 | ands ip, r1, #3 | |
365 | bne .cfu_src_not_aligned | |
366 | /* | |
367 | * Seeing as there has to be at least 8 bytes to copy, we can | |
368 | * copy one word, and force a user-mode page fault... | |
369 | */ | |
370 | ||
371 | .cfu_0fupi: subs r2, r2, #4 | |
372 | addmi ip, r2, #4 | |
373 | bmi .cfu_0nowords | |
374 | USER( ldrt r3, [r1], #4) | |
375 | str r3, [r0], #4 | |
376 | mov ip, r1, lsl #32 - PAGE_SHIFT @ On each page, use a ld/st??t instruction | |
377 | rsb ip, ip, #0 | |
378 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
379 | beq .cfu_0fupi | |
380 | /* | |
381 | * ip = max no. of bytes to copy before needing another "strt" insn | |
382 | */ | |
383 | cmp r2, ip | |
384 | movlt ip, r2 | |
385 | sub r2, r2, ip | |
386 | subs ip, ip, #32 | |
387 | blt .cfu_0rem8lp | |
388 | PLD( pld [r1, #28] ) | |
389 | PLD( pld [r0, #28] ) | |
390 | PLD( subs ip, ip, #64 ) | |
391 | PLD( blt .cfu_0cpynopld ) | |
392 | PLD( pld [r1, #60] ) | |
393 | PLD( pld [r0, #60] ) | |
394 | ||
395 | .cfu_0cpy8lp: | |
396 | PLD( pld [r1, #92] ) | |
397 | PLD( pld [r0, #92] ) | |
398 | .cfu_0cpynopld: ldmia r1!, {r3 - r6} @ Shouldnt fault | |
399 | stmia r0!, {r3 - r6} | |
400 | ldmia r1!, {r3 - r6} @ Shouldnt fault | |
401 | subs ip, ip, #32 | |
402 | stmia r0!, {r3 - r6} | |
403 | bpl .cfu_0cpy8lp | |
404 | PLD( cmn ip, #64 ) | |
405 | PLD( bge .cfu_0cpynopld ) | |
406 | PLD( add ip, ip, #64 ) | |
407 | ||
408 | .cfu_0rem8lp: cmn ip, #16 | |
409 | ldmgeia r1!, {r3 - r6} @ Shouldnt fault | |
410 | stmgeia r0!, {r3 - r6} | |
411 | tst ip, #8 | |
412 | ldmneia r1!, {r3 - r4} @ Shouldnt fault | |
413 | stmneia r0!, {r3 - r4} | |
414 | tst ip, #4 | |
415 | ldrnet r3, [r1], #4 @ Shouldnt fault | |
416 | strne r3, [r0], #4 | |
417 | ands ip, ip, #3 | |
418 | beq .cfu_0fupi | |
419 | .cfu_0nowords: teq ip, #0 | |
420 | beq .cfu_finished | |
421 | .cfu_nowords: cmp ip, #2 | |
422 | USER( ldrbt r3, [r1], #1) @ May fault | |
423 | strb r3, [r0], #1 | |
424 | USER( ldrgebt r3, [r1], #1) @ May fault | |
425 | strgeb r3, [r0], #1 | |
426 | USER( ldrgtbt r3, [r1], #1) @ May fault | |
427 | strgtb r3, [r0], #1 | |
428 | b .cfu_finished | |
429 | ||
430 | .cfu_not_enough: | |
431 | movs ip, r2 | |
432 | bne .cfu_nowords | |
433 | .cfu_finished: mov r0, #0 | |
434 | add sp, sp, #8 | |
435 | LOADREGS(fd,sp!,{r4 - r7, pc}) | |
436 | ||
437 | .cfu_src_not_aligned: | |
438 | bic r1, r1, #3 | |
439 | USER( ldrt r7, [r1], #4) @ May fault | |
440 | cmp ip, #2 | |
441 | bgt .cfu_3fupi | |
442 | beq .cfu_2fupi | |
443 | .cfu_1fupi: subs r2, r2, #4 | |
444 | addmi ip, r2, #4 | |
445 | bmi .cfu_1nowords | |
446 | mov r3, r7, pull #8 | |
447 | USER( ldrt r7, [r1], #4) @ May fault | |
448 | orr r3, r3, r7, push #24 | |
449 | str r3, [r0], #4 | |
450 | mov ip, r1, lsl #32 - PAGE_SHIFT | |
451 | rsb ip, ip, #0 | |
452 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
453 | beq .cfu_1fupi | |
454 | cmp r2, ip | |
455 | movlt ip, r2 | |
456 | sub r2, r2, ip | |
457 | subs ip, ip, #16 | |
458 | blt .cfu_1rem8lp | |
459 | PLD( pld [r1, #12] ) | |
460 | PLD( pld [r0, #12] ) | |
461 | PLD( subs ip, ip, #32 ) | |
462 | PLD( blt .cfu_1cpynopld ) | |
463 | PLD( pld [r1, #28] ) | |
464 | PLD( pld [r0, #28] ) | |
465 | ||
466 | .cfu_1cpy8lp: | |
467 | PLD( pld [r1, #44] ) | |
468 | PLD( pld [r0, #44] ) | |
469 | .cfu_1cpynopld: mov r3, r7, pull #8 | |
470 | ldmia r1!, {r4 - r7} @ Shouldnt fault | |
471 | subs ip, ip, #16 | |
472 | orr r3, r3, r4, push #24 | |
473 | mov r4, r4, pull #8 | |
474 | orr r4, r4, r5, push #24 | |
475 | mov r5, r5, pull #8 | |
476 | orr r5, r5, r6, push #24 | |
477 | mov r6, r6, pull #8 | |
478 | orr r6, r6, r7, push #24 | |
479 | stmia r0!, {r3 - r6} | |
480 | bpl .cfu_1cpy8lp | |
481 | PLD( cmn ip, #32 ) | |
482 | PLD( bge .cfu_1cpynopld ) | |
483 | PLD( add ip, ip, #32 ) | |
484 | ||
485 | .cfu_1rem8lp: tst ip, #8 | |
486 | movne r3, r7, pull #8 | |
487 | ldmneia r1!, {r4, r7} @ Shouldnt fault | |
488 | orrne r3, r3, r4, push #24 | |
489 | movne r4, r4, pull #8 | |
490 | orrne r4, r4, r7, push #24 | |
491 | stmneia r0!, {r3 - r4} | |
492 | tst ip, #4 | |
493 | movne r3, r7, pull #8 | |
494 | USER( ldrnet r7, [r1], #4) @ May fault | |
495 | orrne r3, r3, r7, push #24 | |
496 | strne r3, [r0], #4 | |
497 | ands ip, ip, #3 | |
498 | beq .cfu_1fupi | |
499 | .cfu_1nowords: mov r3, r7, get_byte_1 | |
500 | teq ip, #0 | |
501 | beq .cfu_finished | |
502 | cmp ip, #2 | |
503 | strb r3, [r0], #1 | |
504 | movge r3, r7, get_byte_2 | |
505 | strgeb r3, [r0], #1 | |
506 | movgt r3, r7, get_byte_3 | |
507 | strgtb r3, [r0], #1 | |
508 | b .cfu_finished | |
509 | ||
510 | .cfu_2fupi: subs r2, r2, #4 | |
511 | addmi ip, r2, #4 | |
512 | bmi .cfu_2nowords | |
513 | mov r3, r7, pull #16 | |
514 | USER( ldrt r7, [r1], #4) @ May fault | |
515 | orr r3, r3, r7, push #16 | |
516 | str r3, [r0], #4 | |
517 | mov ip, r1, lsl #32 - PAGE_SHIFT | |
518 | rsb ip, ip, #0 | |
519 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
520 | beq .cfu_2fupi | |
521 | cmp r2, ip | |
522 | movlt ip, r2 | |
523 | sub r2, r2, ip | |
524 | subs ip, ip, #16 | |
525 | blt .cfu_2rem8lp | |
526 | PLD( pld [r1, #12] ) | |
527 | PLD( pld [r0, #12] ) | |
528 | PLD( subs ip, ip, #32 ) | |
529 | PLD( blt .cfu_2cpynopld ) | |
530 | PLD( pld [r1, #28] ) | |
531 | PLD( pld [r0, #28] ) | |
532 | ||
533 | .cfu_2cpy8lp: | |
534 | PLD( pld [r1, #44] ) | |
535 | PLD( pld [r0, #44] ) | |
536 | .cfu_2cpynopld: mov r3, r7, pull #16 | |
537 | ldmia r1!, {r4 - r7} @ Shouldnt fault | |
538 | subs ip, ip, #16 | |
539 | orr r3, r3, r4, push #16 | |
540 | mov r4, r4, pull #16 | |
541 | orr r4, r4, r5, push #16 | |
542 | mov r5, r5, pull #16 | |
543 | orr r5, r5, r6, push #16 | |
544 | mov r6, r6, pull #16 | |
545 | orr r6, r6, r7, push #16 | |
546 | stmia r0!, {r3 - r6} | |
547 | bpl .cfu_2cpy8lp | |
548 | PLD( cmn ip, #32 ) | |
549 | PLD( bge .cfu_2cpynopld ) | |
550 | PLD( add ip, ip, #32 ) | |
551 | ||
552 | .cfu_2rem8lp: tst ip, #8 | |
553 | movne r3, r7, pull #16 | |
554 | ldmneia r1!, {r4, r7} @ Shouldnt fault | |
555 | orrne r3, r3, r4, push #16 | |
556 | movne r4, r4, pull #16 | |
557 | orrne r4, r4, r7, push #16 | |
558 | stmneia r0!, {r3 - r4} | |
559 | tst ip, #4 | |
560 | movne r3, r7, pull #16 | |
561 | USER( ldrnet r7, [r1], #4) @ May fault | |
562 | orrne r3, r3, r7, push #16 | |
563 | strne r3, [r0], #4 | |
564 | ands ip, ip, #3 | |
565 | beq .cfu_2fupi | |
566 | .cfu_2nowords: mov r3, r7, get_byte_2 | |
567 | teq ip, #0 | |
568 | beq .cfu_finished | |
569 | cmp ip, #2 | |
570 | strb r3, [r0], #1 | |
571 | movge r3, r7, get_byte_3 | |
572 | strgeb r3, [r0], #1 | |
573 | USER( ldrgtbt r3, [r1], #0) @ May fault | |
574 | strgtb r3, [r0], #1 | |
575 | b .cfu_finished | |
576 | ||
577 | .cfu_3fupi: subs r2, r2, #4 | |
578 | addmi ip, r2, #4 | |
579 | bmi .cfu_3nowords | |
580 | mov r3, r7, pull #24 | |
581 | USER( ldrt r7, [r1], #4) @ May fault | |
582 | orr r3, r3, r7, push #8 | |
583 | str r3, [r0], #4 | |
584 | mov ip, r1, lsl #32 - PAGE_SHIFT | |
585 | rsb ip, ip, #0 | |
586 | movs ip, ip, lsr #32 - PAGE_SHIFT | |
587 | beq .cfu_3fupi | |
588 | cmp r2, ip | |
589 | movlt ip, r2 | |
590 | sub r2, r2, ip | |
591 | subs ip, ip, #16 | |
592 | blt .cfu_3rem8lp | |
593 | PLD( pld [r1, #12] ) | |
594 | PLD( pld [r0, #12] ) | |
595 | PLD( subs ip, ip, #32 ) | |
596 | PLD( blt .cfu_3cpynopld ) | |
597 | PLD( pld [r1, #28] ) | |
598 | PLD( pld [r0, #28] ) | |
599 | ||
600 | .cfu_3cpy8lp: | |
601 | PLD( pld [r1, #44] ) | |
602 | PLD( pld [r0, #44] ) | |
603 | .cfu_3cpynopld: mov r3, r7, pull #24 | |
604 | ldmia r1!, {r4 - r7} @ Shouldnt fault | |
605 | orr r3, r3, r4, push #8 | |
606 | mov r4, r4, pull #24 | |
607 | orr r4, r4, r5, push #8 | |
608 | mov r5, r5, pull #24 | |
609 | orr r5, r5, r6, push #8 | |
610 | mov r6, r6, pull #24 | |
611 | orr r6, r6, r7, push #8 | |
612 | stmia r0!, {r3 - r6} | |
613 | subs ip, ip, #16 | |
614 | bpl .cfu_3cpy8lp | |
615 | PLD( cmn ip, #32 ) | |
616 | PLD( bge .cfu_3cpynopld ) | |
617 | PLD( add ip, ip, #32 ) | |
618 | ||
619 | .cfu_3rem8lp: tst ip, #8 | |
620 | movne r3, r7, pull #24 | |
621 | ldmneia r1!, {r4, r7} @ Shouldnt fault | |
622 | orrne r3, r3, r4, push #8 | |
623 | movne r4, r4, pull #24 | |
624 | orrne r4, r4, r7, push #8 | |
625 | stmneia r0!, {r3 - r4} | |
626 | tst ip, #4 | |
627 | movne r3, r7, pull #24 | |
628 | USER( ldrnet r7, [r1], #4) @ May fault | |
629 | orrne r3, r3, r7, push #8 | |
630 | strne r3, [r0], #4 | |
631 | ands ip, ip, #3 | |
632 | beq .cfu_3fupi | |
633 | .cfu_3nowords: mov r3, r7, get_byte_3 | |
634 | teq ip, #0 | |
635 | beq .cfu_finished | |
636 | cmp ip, #2 | |
637 | strb r3, [r0], #1 | |
638 | USER( ldrgebt r3, [r1], #1) @ May fault | |
639 | strgeb r3, [r0], #1 | |
640 | USER( ldrgtbt r3, [r1], #1) @ May fault | |
641 | strgtb r3, [r0], #1 | |
642 | b .cfu_finished | |
643 | ||
644 | .section .fixup,"ax" | |
645 | .align 0 | |
646 | /* | |
647 | * We took an exception. r0 contains a pointer to | |
648 | * the byte not copied. | |
649 | */ | |
650 | 9001: ldr r2, [sp], #4 @ void *to | |
651 | sub r2, r0, r2 @ bytes copied | |
652 | ldr r1, [sp], #4 @ unsigned long count | |
653 | subs r4, r1, r2 @ bytes left to copy | |
654 | movne r1, r4 | |
655 | blne __memzero | |
656 | mov r0, r4 | |
657 | LOADREGS(fd,sp!, {r4 - r7, pc}) | |
658 | .previous | |
659 | ||
660 | /* Prototype: int __arch_clear_user(void *addr, size_t sz) | |
661 | * Purpose : clear some user memory | |
662 | * Params : addr - user memory address to clear | |
663 | * : sz - number of bytes to clear | |
664 | * Returns : number of bytes NOT cleared | |
665 | */ | |
666 | ENTRY(__arch_clear_user) | |
667 | stmfd sp!, {r1, lr} | |
668 | mov r2, #0 | |
669 | cmp r1, #4 | |
670 | blt 2f | |
671 | ands ip, r0, #3 | |
672 | beq 1f | |
673 | cmp ip, #2 | |
674 | USER( strbt r2, [r0], #1) | |
675 | USER( strlebt r2, [r0], #1) | |
676 | USER( strltbt r2, [r0], #1) | |
677 | rsb ip, ip, #4 | |
678 | sub r1, r1, ip @ 7 6 5 4 3 2 1 | |
679 | 1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7 | |
680 | USER( strplt r2, [r0], #4) | |
681 | USER( strplt r2, [r0], #4) | |
682 | bpl 1b | |
683 | adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3 | |
684 | USER( strplt r2, [r0], #4) | |
685 | 2: tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x | |
686 | USER( strnebt r2, [r0], #1) | |
687 | USER( strnebt r2, [r0], #1) | |
688 | tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1 | |
689 | USER( strnebt r2, [r0], #1) | |
690 | mov r0, #0 | |
691 | LOADREGS(fd,sp!, {r1, pc}) | |
692 | ||
693 | .section .fixup,"ax" | |
694 | .align 0 | |
695 | 9001: LOADREGS(fd,sp!, {r0, pc}) | |
696 | .previous | |
697 |