1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
|
/* $Id: copy_page.S,v 1.8 2003/08/25 17:03:10 lethal Exp $
*
* copy_page, __copy_user_page, __copy_user implementation of SuperH
*
* Copyright (C) 2001 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2002 Toshinobu Sugioka
*
*/
#include <linux/linkage.h>
/*
* copy_page_slow
* @to: P1 address
* @from: P1 address
*
* void copy_page_slow(void *to, void *from)
*/
/*
* r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
* r8 --- from + 4096
* r9 --- not used
* r10 --- to
* r11 --- from
*/
ENTRY(copy_page_slow)
mov.l r8,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov r4,r10
mov r5,r11
mov r5,r8
mov.w .L4096,r0
add r0,r8
!
1: mov.l @r11+,r0
mov.l @r11+,r1
mov.l @r11+,r2
mov.l @r11+,r3
mov.l @r11+,r4
mov.l @r11+,r5
mov.l @r11+,r6
mov.l @r11+,r7
#if defined(CONFIG_CPU_SH3)
mov.l r0,@r10
#elif defined(CONFIG_CPU_SH4)
movca.l r0,@r10
mov r10,r0
#endif
add #32,r10
mov.l r7,@-r10
mov.l r6,@-r10
mov.l r5,@-r10
mov.l r4,@-r10
mov.l r3,@-r10
mov.l r2,@-r10
mov.l r1,@-r10
#if defined(CONFIG_CPU_SH4)
ocbwb @r0
#endif
cmp/eq r11,r8
bf/s 1b
add #28,r10
!
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r8
rts
nop
#if defined(CONFIG_CPU_SH4)
/*
* __copy_user_page
* @to: P1 address (with same color)
* @from: P1 address
* @orig_to: P1 address
*
* void __copy_user_page(void *to, void *from, void *orig_to)
*/
/*
* r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
* r8 --- from + 4096
* r9 --- orig_to
* r10 --- to
* r11 --- from
*/
ENTRY(__copy_user_page)
mov.l r8,@-r15
mov.l r9,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov r4,r10
mov r5,r11
mov r6,r9
mov r5,r8
mov.w .L4096,r0
add r0,r8
!
1: ocbi @r9
add #32,r9
mov.l @r11+,r0
mov.l @r11+,r1
mov.l @r11+,r2
mov.l @r11+,r3
mov.l @r11+,r4
mov.l @r11+,r5
mov.l @r11+,r6
mov.l @r11+,r7
movca.l r0,@r10
mov r10,r0
add #32,r10
mov.l r7,@-r10
mov.l r6,@-r10
mov.l r5,@-r10
mov.l r4,@-r10
mov.l r3,@-r10
mov.l r2,@-r10
mov.l r1,@-r10
ocbwb @r0
cmp/eq r11,r8
bf/s 1b
add #28,r10
!
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r9
mov.l @r15+,r8
rts
nop
#endif
.L4096: .word 4096
/*
* __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
* Return the number of bytes NOT copied
*/
#define EX(...) \
9999: __VA_ARGS__ ; \
.section __ex_table, "a"; \
.long 9999b, 6000f ; \
.previous
ENTRY(__copy_user)
tst r6,r6 ! Check explicitly for zero
bf 1f
rts
mov #0,r0 ! normal return
1:
mov.l r10,@-r15
mov.l r9,@-r15
mov.l r8,@-r15
mov r4,r3
add r6,r3 ! last destination address
mov #12,r0 ! Check if small number of bytes
cmp/gt r0,r6
bt 2f
bra .L_cleanup_loop
nop
2:
neg r5,r0 ! Calculate bytes needed to align source
add #4,r0
and #3,r0
tst r0,r0
bt .L_jump
mov r0,r1
.L_loop1:
! Copy bytes to align source
EX( mov.b @r5+,r0 )
dt r1
EX( mov.b r0,@r4 )
add #-1,r6
bf/s .L_loop1
add #1,r4
.L_jump:
mov r6,r2 ! Calculate number of longwords to copy
shlr2 r2
tst r2,r2
bt .L_cleanup
mov r4,r0 ! Jump to appropriate routine
and #3,r0
mov r0,r1
shll2 r1
mova .L_jump_tbl,r0
mov.l @(r0,r1),r1
jmp @r1
nop
.align 2
.L_jump_tbl:
.long .L_dest00
.long .L_dest01
.long .L_dest10
.long .L_dest11
! Destination = 00
.L_dest00:
mov r2,r7
shlr2 r7
shlr r7
tst r7,r7
mov #7,r0
bt/s 1f
and r0,r2
.align 2
2:
EX( mov.l @r5+,r0 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r9 )
EX( mov.l @r5+,r10 )
EX( mov.l r0,@r4 )
EX( mov.l r8,@(4,r4) )
EX( mov.l r9,@(8,r4) )
EX( mov.l r10,@(12,r4) )
EX( mov.l @r5+,r0 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r9 )
EX( mov.l @r5+,r10 )
dt r7
EX( mov.l r0,@(16,r4) )
EX( mov.l r8,@(20,r4) )
EX( mov.l r9,@(24,r4) )
EX( mov.l r10,@(28,r4) )
bf/s 2b
add #32,r4
tst r2,r2
bt .L_cleanup
1:
EX( mov.l @r5+,r0 )
dt r2
EX( mov.l r0,@r4 )
bf/s 1b
add #4,r4
bra .L_cleanup
nop
! Destination = 10
.L_dest10:
mov r2,r7
shlr2 r7
shlr r7
tst r7,r7
mov #7,r0
bt/s 1f
and r0,r2
2:
dt r7
#ifdef __LITTLE_ENDIAN__
EX( mov.l @r5+,r0 )
EX( mov.l @r5+,r1 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r9 )
EX( mov.l @r5+,r10 )
EX( mov.w r0,@r4 )
add #2,r4
xtrct r1,r0
xtrct r8,r1
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@r4 )
EX( mov.l r1,@(4,r4) )
EX( mov.l r8,@(8,r4) )
EX( mov.l r9,@(12,r4) )
EX( mov.l @r5+,r1 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r0 )
xtrct r1,r10
xtrct r8,r1
xtrct r0,r8
shlr16 r0
EX( mov.l r10,@(16,r4) )
EX( mov.l r1,@(20,r4) )
EX( mov.l r8,@(24,r4) )
EX( mov.w r0,@(28,r4) )
bf/s 2b
add #30,r4
#else
EX( mov.l @(28,r5),r0 )
EX( mov.l @(24,r5),r8 )
EX( mov.l @(20,r5),r9 )
EX( mov.l @(16,r5),r10 )
EX( mov.w r0,@(30,r4) )
add #-2,r4
xtrct r8,r0
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@(28,r4) )
EX( mov.l r8,@(24,r4) )
EX( mov.l r9,@(20,r4) )
EX( mov.l @(12,r5),r0 )
EX( mov.l @(8,r5),r8 )
xtrct r0,r10
EX( mov.l @(4,r5),r9 )
mov.l r10,@(16,r4)
EX( mov.l @r5,r10 )
xtrct r8,r0
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@(12,r4) )
EX( mov.l r8,@(8,r4) )
swap.w r10,r0
EX( mov.l r9,@(4,r4) )
EX( mov.w r0,@(2,r4) )
add #32,r5
bf/s 2b
add #34,r4
#endif
tst r2,r2
bt .L_cleanup
1: ! Read longword, write two words per iteration
EX( mov.l @r5+,r0 )
dt r2
#ifdef __LITTLE_ENDIAN__
EX( mov.w r0,@r4 )
shlr16 r0
EX( mov.w r0,@(2,r4) )
#else
EX( mov.w r0,@(2,r4) )
shlr16 r0
EX( mov.w r0,@r4 )
#endif
bf/s 1b
add #4,r4
bra .L_cleanup
nop
! Destination = 01 or 11
.L_dest01:
.L_dest11:
! Read longword, write byte, word, byte per iteration
EX( mov.l @r5+,r0 )
dt r2
#ifdef __LITTLE_ENDIAN__
EX( mov.b r0,@r4 )
shlr8 r0
add #1,r4
EX( mov.w r0,@r4 )
shlr16 r0
EX( mov.b r0,@(2,r4) )
bf/s .L_dest01
add #3,r4
#else
EX( mov.b r0,@(3,r4) )
shlr8 r0
swap.w r0,r7
EX( mov.b r7,@r4 )
add #1,r4
EX( mov.w r0,@r4 )
bf/s .L_dest01
add #3,r4
#endif
! Cleanup last few bytes
.L_cleanup:
mov r6,r0
and #3,r0
tst r0,r0
bt .L_exit
mov r0,r6
.L_cleanup_loop:
EX( mov.b @r5+,r0 )
dt r6
EX( mov.b r0,@r4 )
bf/s .L_cleanup_loop
add #1,r4
.L_exit:
mov #0,r0 ! normal return
5000:
# Exception handler:
.section .fixup, "ax"
6000:
mov.l 8000f,r1
mov r3,r0
jmp @r1
sub r4,r0
.align 2
8000: .long 5000b
.previous
mov.l @r15+,r8
mov.l @r15+,r9
rts
mov.l @r15+,r10
|
