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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [emultempl/] [spu_ovl.S] - Blame information for rev 146

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1 145 khays
/* Overlay manager for SPU.
2
 
3
   Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4
 
5
   This file is part of the GNU Binutils.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20
   MA 02110-1301, USA.  */
21
 
22
/* MFC DMA defn's.  */
23
#define MFC_GET_CMD             0x40
24
#define MFC_MAX_DMA_SIZE        0x4000
25
#define MFC_TAG_UPDATE_ALL      2
26
#define MFC_TAG_ID              0
27
 
28
/* Register usage.  */
29
#define reserved1       $75
30
#define parm            $75
31
#define tab1            reserved1
32
#define tab2            reserved1
33
#define vma             reserved1
34
#define oldvma          reserved1
35
#define newmask         reserved1
36
#define map             reserved1
37
 
38
#define reserved2       $76
39
#define off1            reserved2
40
#define off2            reserved2
41
#define present1        reserved2
42
#define present2        reserved2
43
#define sz              reserved2
44
#define cmp             reserved2
45
#define add64           reserved2
46
#define cgbits          reserved2
47
#define off3            reserved2
48
#define off4            reserved2
49
#define addr4           reserved2
50
#define off5            reserved2
51
#define tagstat         reserved2
52
 
53
#define reserved3       $77
54
#define size1           reserved3
55
#define size2           reserved3
56
#define rv3             reserved3
57
#define ealo            reserved3
58
#define cmd             reserved3
59
#define off64           reserved3
60
#define tab3            reserved3
61
#define tab4            reserved3
62
#define tab5            reserved3
63
 
64
#define reserved4       $78
65
#define ovl             reserved4
66
#define rv2             reserved4
67
#define rv5             reserved4
68
#define cgshuf          reserved4
69
#define newovl          reserved4
70
#define irqtmp1         reserved4
71
#define irqtmp2         reserved4
72
 
73
#define reserved5       $79
74
#define target          reserved5
75
 
76
#define save1           $74
77
#define rv4             save1
78
#define rv7             save1
79
#define tagid           save1
80
#define maxsize         save1
81
#define pbyte           save1
82
#define pbit            save1
83
 
84
#define save2           $73
85
#define cur             save2
86
#define rv6             save2
87
#define osize           save2
88
#define zovl            save2
89
#define oldovl          save2
90
#define newvma          save2
91
 
92
#define save3           $72
93
#define rv1             save3
94
#define ea64            save3
95
#define buf3            save3
96
#define genwi           save3
97
#define newmap          save3
98
#define oldmask         save3
99
 
100
#define save4           $71
101
#define irq_stat        save4
102
 
103
        .text
104
        .align  4
105
        .type   __rv_pattern, @object
106
        .size   __rv_pattern, 16
107
__rv_pattern:
108
        .word   0x00010203, 0x10111213, 0x80808080, 0x80808080
109
 
110
        .type   __cg_pattern, @object
111
        .size   __cg_pattern, 16
112
__cg_pattern:
113
        .word   0x04050607, 0x80808080, 0x80808080, 0x80808080
114
 
115
        .type   __ovly_current, @object
116
        .size   __ovly_current, 16
117
__ovly_current:
118
        .space  16
119
 
120
/*
121
 * __ovly_return - stub for returning from overlay functions.
122
 *
123
 * On entry the four slots of $lr are:
124
 *   __ovly_return, prev ovl index, caller return addr, undefined.
125
 *
126
 * Load the previous overlay and jump to the caller return address.
127
 * Updates __ovly_current.
128
 */
129
        .align  4
130
        .global __ovly_return
131
        .type   __ovly_return, @function
132
__ovly_return:
133
        ila     tab1, _ovly_table - 16                          # 0,2   0
134
        shlqbyi ovl, $lr, 4                                     # 1,4   0
135
#nop
136
        shlqbyi target, $lr, 8                                  # 1,4   1
137
#nop; lnop
138
#nop; lnop
139
        shli    off1, ovl, 4                                    # 0,4   4
140
#lnop
141
#nop
142
        hbr     ovly_ret9, target                               # 1,15  5
143
#nop; lnop
144
#nop; lnop
145
#nop
146
        lqx     vma, tab1, off1                                 # 1,6   8
147
#ifdef OVLY_IRQ_SAVE
148
        nop
149
        stqd    save4, -64($sp)                                 # 1,6   9
150
#else
151
#nop; lnop
152
#endif
153
#nop; lnop
154
#nop; lnop
155
#nop; lnop
156
#nop; lnop
157
#nop
158
        rotqbyi size1, vma, 4                                   # 1,4   14
159
#nop
160
        stqd    save3, -48($sp)                                 # 1,6   15
161
#nop
162
        stqd    save2, -32($sp)                                 # 1,6   16
163
#nop
164
        stqd    save1, -16($sp)                                 # 1,6   17
165
        andi    present1, size1, 1                              # 0,2   18
166
        stqr    ovl, __ovly_current                             # 1,6   18
167
#nop; lnop
168
#nop
169
        brz     present1, do_load                               # 1,4   20
170
ovly_ret9:
171
#nop
172
        bi      target                                          # 1,4   21
173
 
174
/*
175
 * __ovly_load - copy an overlay partion to local store.
176
 *
177
 * On entry $75 points to a word consisting of the overlay index in
178
 * the top 14 bits, and the target address in the bottom 18 bits.
179
 *
180
 * Sets up $lr to return via __ovly_return.  If $lr is already set
181
 * to return via __ovly_return, don't change it.  In that case we
182
 * have a tail call from one overlay function to another.
183
 * Updates __ovly_current.
184
 */
185
        .align  3
186
        .global __ovly_load
187
        .type   __ovly_load, @function
188
__ovly_load:
189
#if OVL_STUB_SIZE == 8
190
########
191
#nop
192
        lqd     target, 0(parm)                                 # 1,6   -11
193
#nop; lnop
194
#nop; lnop
195
#nop; lnop
196
#nop; lnop
197
#nop; lnop
198
#nop
199
        rotqby  target, target, parm                            # 1,4   -5
200
        ila     tab2, _ovly_table - 16                          # 0,2   -4
201
        stqd    save3, -48($sp)                                 # 1,6   -4
202
#nop
203
        stqd    save2, -32($sp)                                 # 1,6   -3
204
#nop
205
        stqd    save1, -16($sp)                                 # 1,6   -2
206
        rotmi   ovl, target, -18                                # 0,4   -1
207
        hbr     ovly_load9, target                              # 1,15  -1
208
        ila     rv1, __ovly_return                              # 0,2   0
209
#lnop
210
#nop; lnop
211
#nop
212
        lqr     cur, __ovly_current                             # 1,6   2
213
        shli    off2, ovl, 4                                    # 0,4   3
214
        stqr    ovl, __ovly_current                             # 1,6   3
215
        ceq     rv2, $lr, rv1                                   # 0,2   4
216
        lqr     rv3, __rv_pattern                               # 1,6   4
217
#nop; lnop
218
#nop; lnop
219
#nop
220
        lqx     vma, tab2, off2                                 # 1,6   7
221
########
222
#else /* OVL_STUB_SIZE == 16 */
223
########
224
        ila     tab2, _ovly_table - 16                          # 0,2   0
225
        stqd    save3, -48($sp)                                 # 1,6   0
226
        ila     rv1, __ovly_return                              # 0,2   1
227
        stqd    save2, -32($sp)                                 # 1,6   1
228
        shli    off2, ovl, 4                                    # 0,4   2
229
        lqr     cur, __ovly_current                             # 1,6   2
230
        nop
231
        stqr    ovl, __ovly_current                             # 1,6   3
232
        ceq     rv2, $lr, rv1                                   # 0,2   4
233
        lqr     rv3, __rv_pattern                               # 1,6   4
234
#nop
235
        hbr     ovly_load9, target                              # 1,15  5
236
#nop
237
        lqx     vma, tab2, off2                                 # 1,6   6
238
#nop
239
        stqd    save1, -16($sp)                                 # 1,6   7
240
########
241
#endif
242
 
243
#nop; lnop
244
#nop; lnop
245
#nop
246
        shufb   rv4, rv1, cur, rv3                              # 1,4   10
247
#nop
248
        fsmb    rv5, rv2                                        # 1,4   11
249
#nop
250
        rotqmbyi rv6, $lr, -8                                   # 1,4   12
251
#nop
252
        rotqbyi size2, vma, 4                                   # 1,4   13
253
#nop
254
        lqd     save3, -48($sp)                                 # 1,6   14
255
#nop; lnop
256
        or      rv7, rv4, rv6                                   # 0,2   16
257
        lqd     save2, -32($sp)                                 # 1,6   16
258
        andi    present2, size2, 1                              # 0,2   17
259
#ifdef OVLY_IRQ_SAVE
260
        stqd    save4, -64($sp)                                 # 1,6   17
261
#else
262
        lnop                                                    # 1,0   17
263
#endif
264
        selb    $lr, rv7, $lr, rv5                              # 0,2   18
265
        lqd     save1, -16($sp)                                 # 1,6   18
266
#nop
267
        brz     present2, do_load                               # 1,4   19
268
ovly_load9:
269
#nop
270
        bi      target                                          # 1,4   20
271
 
272
/* If we get here, we are about to load a new overlay.
273
 * "vma" contains the relevant entry from _ovly_table[].
274
 *      extern struct {
275
 *              u32 vma;
276
 *              u32 size;
277
 *              u32 file_offset;
278
 *              u32 buf;
279
 *      } _ovly_table[];
280
 */
281
        .align  3
282
        .global __ovly_load_event
283
        .type   __ovly_load_event, @function
284
__ovly_load_event:
285
do_load:
286
#ifdef OVLY_IRQ_SAVE
287
        ila     irqtmp1, do_load10                              # 0,2   -5
288
        rotqbyi sz, vma, 8                                      # 1,4   -5
289
#nop
290
        rdch    irq_stat, $SPU_RdMachStat                       # 1,6   -4
291
#nop
292
        bid     irqtmp1                                         # 1,4   -3
293
do_load10:
294
        nop
295
#else
296
#nop
297
        rotqbyi sz, vma, 8                                      # 1,4   0
298
#endif
299
        rotqbyi osize, vma, 4                                   # 1,4   1
300
#nop
301
        lqa     ea64, _EAR_                                     # 1,6   2
302
#nop
303
        lqr     cgshuf, __cg_pattern                            # 1,6   3
304
 
305
/* We could predict the branch at the end of this loop by adding a few
306
   instructions, and there are plenty of free cycles to do so without
307
   impacting loop execution time.  However, it doesn't make a great
308
   deal of sense since we need to wait for the dma to complete anyway.  */
309
__ovly_xfer_loop:
310
#nop
311
        rotqmbyi off64, sz, -4                                  # 1,4   4
312
#nop; lnop
313
#nop; lnop
314
#nop; lnop
315
        cg      cgbits, ea64, off64                             # 0,2   8
316
#lnop
317
#nop; lnop
318
#nop
319
        shufb   add64, cgbits, cgbits, cgshuf                   # 1,4   10
320
#nop; lnop
321
#nop; lnop
322
#nop; lnop
323
        addx    add64, ea64, off64                              # 0,2   14
324
#lnop
325
        ila     maxsize, MFC_MAX_DMA_SIZE                       # 0,2   15
326
        lnop
327
        ori     ea64, add64, 0                                  # 0,2   16
328
        rotqbyi ealo, add64, 4                                  # 1,4   16
329
        cgt     cmp, osize, maxsize                             # 0,2   17
330
        wrch    $MFC_LSA, vma                                   # 1,6   17
331
#nop; lnop
332
        selb    sz, osize, maxsize, cmp                         # 0,2   19
333
        wrch    $MFC_EAH, ea64                                  # 1,6   19
334
        ila     tagid, MFC_TAG_ID                               # 0,2   20
335
        wrch    $MFC_EAL, ealo                                  # 1,6   20
336
        ila     cmd, MFC_GET_CMD                                # 0,2   21
337
        wrch    $MFC_Size, sz                                   # 1,6   21
338
        sf      osize, sz, osize                                # 0,2   22
339
        wrch    $MFC_TagId, tagid                               # 1,6   22
340
        a       vma, vma, sz                                    # 0,2   23
341
        wrch    $MFC_Cmd, cmd                                   # 1,6   23
342
#nop
343
        brnz    osize, __ovly_xfer_loop                         # 1,4   24
344
 
345
/* Now update our data structions while waiting for DMA to complete.
346
   Low bit of .size needs to be cleared on the _ovly_table entry
347
   corresponding to the evicted overlay, and set on the entry for the
348
   newly loaded overlay.  Note that no overlay may in fact be evicted
349
   as _ovly_buf_table[] starts with all zeros.  Don't zap .size entry
350
   for zero index!  Also of course update the _ovly_buf_table entry.  */
351
#nop
352
        lqr     newovl, __ovly_current                          # 1,6   25
353
#nop; lnop
354
#nop; lnop
355
#nop; lnop
356
#nop; lnop
357
#nop; lnop
358
        shli    off3, newovl, 4                                 # 0,4   31
359
#lnop
360
        ila     tab3, _ovly_table - 16                          # 0,2   32
361
#lnop
362
#nop
363
        fsmbi   pbyte, 0x100                                    # 1,4   33
364
#nop; lnop
365
#nop
366
        lqx     vma, tab3, off3                                 # 1,6   35
367
#nop; lnop
368
        andi    pbit, pbyte, 1                                  # 0,2   37
369
        lnop
370
#nop; lnop
371
#nop; lnop
372
#nop; lnop
373
        or      newvma, vma, pbit                               # 0,2   41
374
        rotqbyi buf3, vma, 12                                   # 1,4   41
375
#nop; lnop
376
#nop
377
        stqx    newvma, tab3, off3                              # 1,6   43
378
#nop; lnop
379
        shli    off4, buf3, 2                                   # 1,4   45
380
#lnop
381
        ila     tab4, _ovly_buf_table - 4                       # 0,2   46
382
#lnop
383
#nop; lnop
384
#nop; lnop
385
#nop
386
        lqx     map, tab4, off4                                 # 1,6   49
387
#nop
388
        cwx     genwi, tab4, off4                               # 1,4   50
389
        a       addr4, tab4, off4                               # 0,2   51
390
#lnop
391
#nop; lnop
392
#nop; lnop
393
#nop; lnop
394
#nop
395
        rotqby  oldovl, map, addr4                              # 1,4   55
396
#nop
397
        shufb   newmap, newovl, map, genwi                      # 0,4   56
398
#if MFC_TAG_ID < 16
399
        ila     newmask, 1 << MFC_TAG_ID                        # 0,2   57
400
#else
401
        ilhu    newmask, 1 << (MFC_TAG_ID - 16)                 # 0,2   57
402
#endif
403
#lnop
404
#nop; lnop
405
#nop; lnop
406
        stqd    newmap, 0(addr4)                                # 1,6   60
407
 
408
/* Save app's tagmask, wait for DMA complete, restore mask.  */
409
        ila     tagstat, MFC_TAG_UPDATE_ALL                     # 0,2   61
410
        rdch    oldmask, $MFC_RdTagMask                         # 1,6   61
411
#nop
412
        wrch    $MFC_WrTagMask, newmask                         # 1,6   62
413
#nop
414
        wrch    $MFC_WrTagUpdate, tagstat                       # 1,6   63
415
#nop
416
        rdch    tagstat, $MFC_RdTagStat                         # 1,6   64
417
#nop
418
        sync                                                    # 1,4   65
419
/* Any hint prior to the sync is lost.  A hint here allows the branch
420
   to complete 15 cycles after the hint.  With no hint the branch will
421
   take 18 or 19 cycles.  */
422
        ila     tab5, _ovly_table - 16                          # 0,2   66
423
        hbr     do_load99, target                               # 1,15  66
424
        shli    off5, oldovl, 4                                 # 0,4   67
425
        wrch    $MFC_WrTagMask, oldmask                         # 1,6   67
426
        ceqi    zovl, oldovl, 0                                 # 0,2   68
427
#lnop
428
#nop; lnop
429
#nop
430
        fsm     zovl, zovl                                      # 1,4   70
431
#nop
432
        lqx     oldvma, tab5, off5                              # 1,6   71
433
#nop
434
        lqd     save3, -48($sp)                                 # 1,6   72
435
#nop; lnop
436
        andc    pbit, pbit, zovl                                # 0,2   74
437
        lqd     save2, -32($sp)                                 # 1,6   74
438
#ifdef OVLY_IRQ_SAVE
439
        ila     irqtmp2, do_load90                              # 0,2   75
440
#lnop
441
        andi    irq_stat, irq_stat, 1                           # 0,2   76
442
#lnop
443
#else
444
#nop; lnop
445
#nop; lnop
446
#endif
447
        andc    oldvma, oldvma, pbit                            # 0,2   77
448
        lqd     save1, -16($sp)                                 # 1,6   77
449
        nop                                                     # 0,0   78
450
#lnop
451
#nop
452
        stqx    oldvma, tab5, off5                              # 1,6   79
453
#nop
454
#ifdef OVLY_IRQ_SAVE
455
        binze   irq_stat, irqtmp2                               # 1,4   80
456
do_load90:
457
#nop
458
        lqd     save4, -64($sp)                                 # 1,6   84
459
#else
460
#nop; lnop
461
#endif
462
 
463
        .global _ovly_debug_event
464
        .type   _ovly_debug_event, @function
465
_ovly_debug_event:
466
        nop
467
/* Branch to target address. */
468
do_load99:
469
        bi      target                                          # 1,4   81/85
470
 
471
        .size   __ovly_load, . - __ovly_load

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