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1da177e4 LT |
1 | /* copy_user.S: Sparc optimized copy_from_user and copy_to_user code. |
2 | * | |
3 | * Copyright(C) 1995 Linus Torvalds | |
4 | * Copyright(C) 1996 David S. Miller | |
5 | * Copyright(C) 1996 Eddie C. Dost | |
6 | * Copyright(C) 1996,1998 Jakub Jelinek | |
7 | * | |
8 | * derived from: | |
9 | * e-mail between David and Eddie. | |
10 | * | |
11 | * Returns 0 if successful, otherwise count of bytes not copied yet | |
12 | */ | |
13 | ||
14 | #include <asm/ptrace.h> | |
15 | #include <asm/asmmacro.h> | |
16 | #include <asm/page.h> | |
17 | ||
18 | /* Work around cpp -rob */ | |
19 | #define ALLOC #alloc | |
20 | #define EXECINSTR #execinstr | |
21 | #define EX(x,y,a,b) \ | |
22 | 98: x,y; \ | |
23 | .section .fixup,ALLOC,EXECINSTR; \ | |
24 | .align 4; \ | |
25 | 99: ba fixupretl; \ | |
26 | a, b, %g3; \ | |
27 | .section __ex_table,ALLOC; \ | |
28 | .align 4; \ | |
29 | .word 98b, 99b; \ | |
30 | .text; \ | |
31 | .align 4 | |
32 | ||
33 | #define EX2(x,y,c,d,e,a,b) \ | |
34 | 98: x,y; \ | |
35 | .section .fixup,ALLOC,EXECINSTR; \ | |
36 | .align 4; \ | |
37 | 99: c, d, e; \ | |
38 | ba fixupretl; \ | |
39 | a, b, %g3; \ | |
40 | .section __ex_table,ALLOC; \ | |
41 | .align 4; \ | |
42 | .word 98b, 99b; \ | |
43 | .text; \ | |
44 | .align 4 | |
45 | ||
46 | #define EXO2(x,y) \ | |
47 | 98: x, y; \ | |
48 | .section __ex_table,ALLOC; \ | |
49 | .align 4; \ | |
50 | .word 98b, 97f; \ | |
51 | .text; \ | |
52 | .align 4 | |
53 | ||
54 | #define EXT(start,end,handler) \ | |
55 | .section __ex_table,ALLOC; \ | |
56 | .align 4; \ | |
57 | .word start, 0, end, handler; \ | |
58 | .text; \ | |
59 | .align 4 | |
60 | ||
61 | /* Please do not change following macros unless you change logic used | |
62 | * in .fixup at the end of this file as well | |
63 | */ | |
64 | ||
65 | /* Both these macros have to start with exactly the same insn */ | |
66 | #define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \ | |
67 | ldd [%src + (offset) + 0x00], %t0; \ | |
68 | ldd [%src + (offset) + 0x08], %t2; \ | |
69 | ldd [%src + (offset) + 0x10], %t4; \ | |
70 | ldd [%src + (offset) + 0x18], %t6; \ | |
71 | st %t0, [%dst + (offset) + 0x00]; \ | |
72 | st %t1, [%dst + (offset) + 0x04]; \ | |
73 | st %t2, [%dst + (offset) + 0x08]; \ | |
74 | st %t3, [%dst + (offset) + 0x0c]; \ | |
75 | st %t4, [%dst + (offset) + 0x10]; \ | |
76 | st %t5, [%dst + (offset) + 0x14]; \ | |
77 | st %t6, [%dst + (offset) + 0x18]; \ | |
78 | st %t7, [%dst + (offset) + 0x1c]; | |
79 | ||
80 | #define MOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \ | |
81 | ldd [%src + (offset) + 0x00], %t0; \ | |
82 | ldd [%src + (offset) + 0x08], %t2; \ | |
83 | ldd [%src + (offset) + 0x10], %t4; \ | |
84 | ldd [%src + (offset) + 0x18], %t6; \ | |
85 | std %t0, [%dst + (offset) + 0x00]; \ | |
86 | std %t2, [%dst + (offset) + 0x08]; \ | |
87 | std %t4, [%dst + (offset) + 0x10]; \ | |
88 | std %t6, [%dst + (offset) + 0x18]; | |
89 | ||
90 | #define MOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \ | |
91 | ldd [%src - (offset) - 0x10], %t0; \ | |
92 | ldd [%src - (offset) - 0x08], %t2; \ | |
93 | st %t0, [%dst - (offset) - 0x10]; \ | |
94 | st %t1, [%dst - (offset) - 0x0c]; \ | |
95 | st %t2, [%dst - (offset) - 0x08]; \ | |
96 | st %t3, [%dst - (offset) - 0x04]; | |
97 | ||
98 | #define MOVE_HALFCHUNK(src, dst, offset, t0, t1, t2, t3) \ | |
99 | lduh [%src + (offset) + 0x00], %t0; \ | |
100 | lduh [%src + (offset) + 0x02], %t1; \ | |
101 | lduh [%src + (offset) + 0x04], %t2; \ | |
102 | lduh [%src + (offset) + 0x06], %t3; \ | |
103 | sth %t0, [%dst + (offset) + 0x00]; \ | |
104 | sth %t1, [%dst + (offset) + 0x02]; \ | |
105 | sth %t2, [%dst + (offset) + 0x04]; \ | |
106 | sth %t3, [%dst + (offset) + 0x06]; | |
107 | ||
108 | #define MOVE_SHORTCHUNK(src, dst, offset, t0, t1) \ | |
109 | ldub [%src - (offset) - 0x02], %t0; \ | |
110 | ldub [%src - (offset) - 0x01], %t1; \ | |
111 | stb %t0, [%dst - (offset) - 0x02]; \ | |
112 | stb %t1, [%dst - (offset) - 0x01]; | |
113 | ||
114 | .text | |
115 | .align 4 | |
116 | ||
117 | .globl __copy_user_begin | |
118 | __copy_user_begin: | |
119 | ||
120 | .globl __copy_user | |
121 | dword_align: | |
122 | andcc %o1, 1, %g0 | |
123 | be 4f | |
124 | andcc %o1, 2, %g0 | |
125 | ||
126 | EXO2(ldub [%o1], %g2) | |
127 | add %o1, 1, %o1 | |
128 | EXO2(stb %g2, [%o0]) | |
129 | sub %o2, 1, %o2 | |
130 | bne 3f | |
131 | add %o0, 1, %o0 | |
132 | ||
133 | EXO2(lduh [%o1], %g2) | |
134 | add %o1, 2, %o1 | |
135 | EXO2(sth %g2, [%o0]) | |
136 | sub %o2, 2, %o2 | |
137 | b 3f | |
138 | add %o0, 2, %o0 | |
139 | 4: | |
140 | EXO2(lduh [%o1], %g2) | |
141 | add %o1, 2, %o1 | |
142 | EXO2(sth %g2, [%o0]) | |
143 | sub %o2, 2, %o2 | |
144 | b 3f | |
145 | add %o0, 2, %o0 | |
146 | ||
147 | __copy_user: /* %o0=dst %o1=src %o2=len */ | |
148 | xor %o0, %o1, %o4 | |
149 | 1: | |
150 | andcc %o4, 3, %o5 | |
151 | 2: | |
152 | bne cannot_optimize | |
153 | cmp %o2, 15 | |
154 | ||
155 | bleu short_aligned_end | |
156 | andcc %o1, 3, %g0 | |
157 | ||
158 | bne dword_align | |
159 | 3: | |
160 | andcc %o1, 4, %g0 | |
161 | ||
162 | be 2f | |
163 | mov %o2, %g1 | |
164 | ||
165 | EXO2(ld [%o1], %o4) | |
166 | sub %g1, 4, %g1 | |
167 | EXO2(st %o4, [%o0]) | |
168 | add %o1, 4, %o1 | |
169 | add %o0, 4, %o0 | |
170 | 2: | |
171 | andcc %g1, 0xffffff80, %g7 | |
172 | be 3f | |
173 | andcc %o0, 4, %g0 | |
174 | ||
175 | be ldd_std + 4 | |
176 | 5: | |
177 | MOVE_BIGCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5) | |
178 | MOVE_BIGCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5) | |
179 | MOVE_BIGCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5) | |
180 | MOVE_BIGCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5) | |
181 | 80: | |
182 | EXT(5b, 80b, 50f) | |
183 | subcc %g7, 128, %g7 | |
184 | add %o1, 128, %o1 | |
185 | bne 5b | |
186 | add %o0, 128, %o0 | |
187 | 3: | |
188 | andcc %g1, 0x70, %g7 | |
189 | be copy_user_table_end | |
190 | andcc %g1, 8, %g0 | |
191 | ||
192 | sethi %hi(copy_user_table_end), %o5 | |
193 | srl %g7, 1, %o4 | |
194 | add %g7, %o4, %o4 | |
195 | add %o1, %g7, %o1 | |
196 | sub %o5, %o4, %o5 | |
197 | jmpl %o5 + %lo(copy_user_table_end), %g0 | |
198 | add %o0, %g7, %o0 | |
199 | ||
200 | copy_user_table: | |
201 | MOVE_LASTCHUNK(o1, o0, 0x60, g2, g3, g4, g5) | |
202 | MOVE_LASTCHUNK(o1, o0, 0x50, g2, g3, g4, g5) | |
203 | MOVE_LASTCHUNK(o1, o0, 0x40, g2, g3, g4, g5) | |
204 | MOVE_LASTCHUNK(o1, o0, 0x30, g2, g3, g4, g5) | |
205 | MOVE_LASTCHUNK(o1, o0, 0x20, g2, g3, g4, g5) | |
206 | MOVE_LASTCHUNK(o1, o0, 0x10, g2, g3, g4, g5) | |
207 | MOVE_LASTCHUNK(o1, o0, 0x00, g2, g3, g4, g5) | |
208 | copy_user_table_end: | |
209 | EXT(copy_user_table, copy_user_table_end, 51f) | |
210 | be copy_user_last7 | |
211 | andcc %g1, 4, %g0 | |
212 | ||
213 | EX(ldd [%o1], %g2, and %g1, 0xf) | |
214 | add %o0, 8, %o0 | |
215 | add %o1, 8, %o1 | |
216 | EX(st %g2, [%o0 - 0x08], and %g1, 0xf) | |
217 | EX2(st %g3, [%o0 - 0x04], and %g1, 0xf, %g1, sub %g1, 4) | |
218 | copy_user_last7: | |
219 | be 1f | |
220 | andcc %g1, 2, %g0 | |
221 | ||
222 | EX(ld [%o1], %g2, and %g1, 7) | |
223 | add %o1, 4, %o1 | |
224 | EX(st %g2, [%o0], and %g1, 7) | |
225 | add %o0, 4, %o0 | |
226 | 1: | |
227 | be 1f | |
228 | andcc %g1, 1, %g0 | |
229 | ||
230 | EX(lduh [%o1], %g2, and %g1, 3) | |
231 | add %o1, 2, %o1 | |
232 | EX(sth %g2, [%o0], and %g1, 3) | |
233 | add %o0, 2, %o0 | |
234 | 1: | |
235 | be 1f | |
236 | nop | |
237 | ||
238 | EX(ldub [%o1], %g2, add %g0, 1) | |
239 | EX(stb %g2, [%o0], add %g0, 1) | |
240 | 1: | |
241 | retl | |
242 | clr %o0 | |
243 | ||
244 | ldd_std: | |
245 | MOVE_BIGALIGNCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5) | |
246 | MOVE_BIGALIGNCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5) | |
247 | MOVE_BIGALIGNCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5) | |
248 | MOVE_BIGALIGNCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5) | |
249 | 81: | |
250 | EXT(ldd_std, 81b, 52f) | |
251 | subcc %g7, 128, %g7 | |
252 | add %o1, 128, %o1 | |
253 | bne ldd_std | |
254 | add %o0, 128, %o0 | |
255 | ||
256 | andcc %g1, 0x70, %g7 | |
257 | be copy_user_table_end | |
258 | andcc %g1, 8, %g0 | |
259 | ||
260 | sethi %hi(copy_user_table_end), %o5 | |
261 | srl %g7, 1, %o4 | |
262 | add %g7, %o4, %o4 | |
263 | add %o1, %g7, %o1 | |
264 | sub %o5, %o4, %o5 | |
265 | jmpl %o5 + %lo(copy_user_table_end), %g0 | |
266 | add %o0, %g7, %o0 | |
267 | ||
268 | cannot_optimize: | |
269 | bleu short_end | |
270 | cmp %o5, 2 | |
271 | ||
272 | bne byte_chunk | |
273 | and %o2, 0xfffffff0, %o3 | |
274 | ||
275 | andcc %o1, 1, %g0 | |
276 | be 10f | |
277 | nop | |
278 | ||
279 | EXO2(ldub [%o1], %g2) | |
280 | add %o1, 1, %o1 | |
281 | EXO2(stb %g2, [%o0]) | |
282 | sub %o2, 1, %o2 | |
283 | andcc %o2, 0xfffffff0, %o3 | |
284 | be short_end | |
285 | add %o0, 1, %o0 | |
286 | 10: | |
287 | MOVE_HALFCHUNK(o1, o0, 0x00, g2, g3, g4, g5) | |
288 | MOVE_HALFCHUNK(o1, o0, 0x08, g2, g3, g4, g5) | |
289 | 82: | |
290 | EXT(10b, 82b, 53f) | |
291 | subcc %o3, 0x10, %o3 | |
292 | add %o1, 0x10, %o1 | |
293 | bne 10b | |
294 | add %o0, 0x10, %o0 | |
295 | b 2f | |
296 | and %o2, 0xe, %o3 | |
297 | ||
298 | byte_chunk: | |
299 | MOVE_SHORTCHUNK(o1, o0, -0x02, g2, g3) | |
300 | MOVE_SHORTCHUNK(o1, o0, -0x04, g2, g3) | |
301 | MOVE_SHORTCHUNK(o1, o0, -0x06, g2, g3) | |
302 | MOVE_SHORTCHUNK(o1, o0, -0x08, g2, g3) | |
303 | MOVE_SHORTCHUNK(o1, o0, -0x0a, g2, g3) | |
304 | MOVE_SHORTCHUNK(o1, o0, -0x0c, g2, g3) | |
305 | MOVE_SHORTCHUNK(o1, o0, -0x0e, g2, g3) | |
306 | MOVE_SHORTCHUNK(o1, o0, -0x10, g2, g3) | |
307 | 83: | |
308 | EXT(byte_chunk, 83b, 54f) | |
309 | subcc %o3, 0x10, %o3 | |
310 | add %o1, 0x10, %o1 | |
311 | bne byte_chunk | |
312 | add %o0, 0x10, %o0 | |
313 | ||
314 | short_end: | |
315 | and %o2, 0xe, %o3 | |
316 | 2: | |
317 | sethi %hi(short_table_end), %o5 | |
318 | sll %o3, 3, %o4 | |
319 | add %o0, %o3, %o0 | |
320 | sub %o5, %o4, %o5 | |
321 | add %o1, %o3, %o1 | |
322 | jmpl %o5 + %lo(short_table_end), %g0 | |
323 | andcc %o2, 1, %g0 | |
324 | 84: | |
325 | MOVE_SHORTCHUNK(o1, o0, 0x0c, g2, g3) | |
326 | MOVE_SHORTCHUNK(o1, o0, 0x0a, g2, g3) | |
327 | MOVE_SHORTCHUNK(o1, o0, 0x08, g2, g3) | |
328 | MOVE_SHORTCHUNK(o1, o0, 0x06, g2, g3) | |
329 | MOVE_SHORTCHUNK(o1, o0, 0x04, g2, g3) | |
330 | MOVE_SHORTCHUNK(o1, o0, 0x02, g2, g3) | |
331 | MOVE_SHORTCHUNK(o1, o0, 0x00, g2, g3) | |
332 | short_table_end: | |
333 | EXT(84b, short_table_end, 55f) | |
334 | be 1f | |
335 | nop | |
336 | EX(ldub [%o1], %g2, add %g0, 1) | |
337 | EX(stb %g2, [%o0], add %g0, 1) | |
338 | 1: | |
339 | retl | |
340 | clr %o0 | |
341 | ||
342 | short_aligned_end: | |
343 | bne short_end | |
344 | andcc %o2, 8, %g0 | |
345 | ||
346 | be 1f | |
347 | andcc %o2, 4, %g0 | |
348 | ||
349 | EXO2(ld [%o1 + 0x00], %g2) | |
350 | EXO2(ld [%o1 + 0x04], %g3) | |
351 | add %o1, 8, %o1 | |
352 | EXO2(st %g2, [%o0 + 0x00]) | |
353 | EX(st %g3, [%o0 + 0x04], sub %o2, 4) | |
354 | add %o0, 8, %o0 | |
355 | 1: | |
356 | b copy_user_last7 | |
357 | mov %o2, %g1 | |
358 | ||
359 | .section .fixup,#alloc,#execinstr | |
360 | .align 4 | |
361 | 97: | |
362 | mov %o2, %g3 | |
363 | fixupretl: | |
364 | sethi %hi(PAGE_OFFSET), %g1 | |
365 | cmp %o0, %g1 | |
366 | blu 1f | |
367 | cmp %o1, %g1 | |
368 | bgeu 1f | |
369 | nop | |
370 | save %sp, -64, %sp | |
371 | mov %i0, %o0 | |
372 | call __bzero | |
373 | mov %g3, %o1 | |
374 | restore | |
375 | 1: retl | |
376 | mov %g3, %o0 | |
377 | ||
378 | /* exception routine sets %g2 to (broken_insn - first_insn)>>2 */ | |
379 | 50: | |
380 | /* This magic counts how many bytes are left when crash in MOVE_BIGCHUNK | |
381 | * happens. This is derived from the amount ldd reads, st stores, etc. | |
382 | * x = g2 % 12; | |
383 | * g3 = g1 + g7 - ((g2 / 12) * 32 + (x < 4) ? 0 : (x - 4) * 4); | |
384 | * o0 += (g2 / 12) * 32; | |
385 | */ | |
386 | cmp %g2, 12 | |
387 | add %o0, %g7, %o0 | |
388 | bcs 1f | |
389 | cmp %g2, 24 | |
390 | bcs 2f | |
391 | cmp %g2, 36 | |
392 | bcs 3f | |
393 | nop | |
394 | sub %g2, 12, %g2 | |
395 | sub %g7, 32, %g7 | |
396 | 3: sub %g2, 12, %g2 | |
397 | sub %g7, 32, %g7 | |
398 | 2: sub %g2, 12, %g2 | |
399 | sub %g7, 32, %g7 | |
400 | 1: cmp %g2, 4 | |
401 | bcs,a 60f | |
402 | clr %g2 | |
403 | sub %g2, 4, %g2 | |
404 | sll %g2, 2, %g2 | |
405 | 60: and %g1, 0x7f, %g3 | |
406 | sub %o0, %g7, %o0 | |
407 | add %g3, %g7, %g3 | |
408 | ba fixupretl | |
409 | sub %g3, %g2, %g3 | |
410 | 51: | |
411 | /* i = 41 - g2; j = i % 6; | |
412 | * g3 = (g1 & 15) + (i / 6) * 16 + (j < 4) ? (j + 1) * 4 : 16; | |
413 | * o0 -= (i / 6) * 16 + 16; | |
414 | */ | |
415 | neg %g2 | |
416 | and %g1, 0xf, %g1 | |
417 | add %g2, 41, %g2 | |
418 | add %o0, %g1, %o0 | |
419 | 1: cmp %g2, 6 | |
420 | bcs,a 2f | |
421 | cmp %g2, 4 | |
422 | add %g1, 16, %g1 | |
423 | b 1b | |
424 | sub %g2, 6, %g2 | |
425 | 2: bcc,a 2f | |
426 | mov 16, %g2 | |
427 | inc %g2 | |
428 | sll %g2, 2, %g2 | |
429 | 2: add %g1, %g2, %g3 | |
430 | ba fixupretl | |
431 | sub %o0, %g3, %o0 | |
432 | 52: | |
433 | /* g3 = g1 + g7 - (g2 / 8) * 32 + (g2 & 4) ? (g2 & 3) * 8 : 0; | |
434 | o0 += (g2 / 8) * 32 */ | |
435 | andn %g2, 7, %g4 | |
436 | add %o0, %g7, %o0 | |
437 | andcc %g2, 4, %g0 | |
438 | and %g2, 3, %g2 | |
439 | sll %g4, 2, %g4 | |
440 | sll %g2, 3, %g2 | |
441 | bne 60b | |
442 | sub %g7, %g4, %g7 | |
443 | ba 60b | |
444 | clr %g2 | |
445 | 53: | |
446 | /* g3 = o3 + (o2 & 15) - (g2 & 8) - (g2 & 4) ? (g2 & 3) * 2 : 0; | |
447 | o0 += (g2 & 8) */ | |
448 | and %g2, 3, %g4 | |
449 | andcc %g2, 4, %g0 | |
450 | and %g2, 8, %g2 | |
451 | sll %g4, 1, %g4 | |
452 | be 1f | |
453 | add %o0, %g2, %o0 | |
454 | add %g2, %g4, %g2 | |
455 | 1: and %o2, 0xf, %g3 | |
456 | add %g3, %o3, %g3 | |
457 | ba fixupretl | |
458 | sub %g3, %g2, %g3 | |
459 | 54: | |
460 | /* g3 = o3 + (o2 & 15) - (g2 / 4) * 2 - (g2 & 2) ? (g2 & 1) : 0; | |
461 | o0 += (g2 / 4) * 2 */ | |
462 | srl %g2, 2, %o4 | |
463 | and %g2, 1, %o5 | |
464 | srl %g2, 1, %g2 | |
465 | add %o4, %o4, %o4 | |
466 | and %o5, %g2, %o5 | |
467 | and %o2, 0xf, %o2 | |
468 | add %o0, %o4, %o0 | |
469 | sub %o3, %o5, %o3 | |
470 | sub %o2, %o4, %o2 | |
471 | ba fixupretl | |
472 | add %o2, %o3, %g3 | |
473 | 55: | |
474 | /* i = 27 - g2; | |
475 | g3 = (o2 & 1) + i / 4 * 2 + !(i & 3); | |
476 | o0 -= i / 4 * 2 + 1 */ | |
477 | neg %g2 | |
478 | and %o2, 1, %o2 | |
479 | add %g2, 27, %g2 | |
480 | srl %g2, 2, %o5 | |
481 | andcc %g2, 3, %g0 | |
482 | mov 1, %g2 | |
483 | add %o5, %o5, %o5 | |
484 | be,a 1f | |
485 | clr %g2 | |
486 | 1: add %g2, %o5, %g3 | |
487 | sub %o0, %g3, %o0 | |
488 | ba fixupretl | |
489 | add %g3, %o2, %g3 | |
490 | ||
491 | .globl __copy_user_end | |
492 | __copy_user_end: |