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
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
|
/* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <shlib-compat.h>
#include <lowlevellock.h>
#include <lowlevelcond.h>
#include <tcb-offsets.h>
#include <kernel-features.h>
#include "lowlevel-atomic.h"
.text
/* int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex) */
.globl __pthread_cond_wait
.type __pthread_cond_wait, @function
.align 5
cfi_startproc
__pthread_cond_wait:
.LSTARTCODE:
#ifdef SHARED
cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect,
DW.ref.__gcc_personality_v0)
cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART)
#else
cfi_personality(DW_EH_PE_absptr, __gcc_personality_v0)
cfi_lsda(DW_EH_PE_absptr, .LexceptSTART)
#endif
mov.l r8, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r8, 0)
mov.l r9, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r9, 0)
mov.l r10, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r10, 0)
mov.l r11, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r11, 0)
mov.l r12, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (r12, 0)
sts.l pr, @-r15
cfi_adjust_cfa_offset (4)
cfi_rel_offset (pr, 0)
add #-48, r15
cfi_adjust_cfa_offset (48)
mov r4, r8
mov r5, r9
#ifdef PIC
mova .Lgot0, r0
mov.l .Lgot0, r12
add r0, r12
#endif
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bt 2f
bra 1f
nop
#ifdef PIC
.align 2
.Lgot0:
.long _GLOBAL_OFFSET_TABLE_
#endif
2:
/* Store the reference to the mutex. If there is already a
different value in there this is a bad user bug. */
mov.l @(dep_mutex,r8),r0
cmp/eq #-1, r0
bt 15f
mov.l r9, @(dep_mutex,r8)
15:
/* Unlock the mutex. */
mov.l .Lmunlock0, r1
mov #0, r5
bsrf r1
mov r9, r4
.Lmunlock0b:
tst r0, r0
bt 0f
bra 12f
nop
0:
mov #1, r2
mov #0, r3
clrt
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(total_seq,r8)
mov.l r1,@(total_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8), r0
add r2, r0
mov.l r0, @(cond_nwaiters,r8)
/* Get and store current wakeup_seq value. */
mov.l @(wakeup_seq,r8), r10
mov.l @(wakeup_seq+4,r8), r11
mov.l @(broadcast_seq,r8), r0
mov.l r0, @(4,r15)
8:
mov.l @(cond_futex,r8),r0
mov.l r0, @(8,r15)
/* Unlock. */
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 3f
4:
.LcleanupSTART:
mov.l .Lenable0, r1
bsrf r1
nop
.Lenable0b:
mov.l r0, @r15
mov #0, r7
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAIT, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAIT|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff0, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAIT, r0
or r0, r5
#endif
99:
mov.l @(8,r15), r6
mov r8, r4
add #cond_futex, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov.l .Ldisable0, r1
bsrf r1
mov.l @r15, r4
.Ldisable0b:
.LcleanupEND:
/* Lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bf 5f
6:
mov.l @(broadcast_seq,r8), r0
mov.l @(4,r15), r1
cmp/eq r0, r1
bf 16f
mov.l @(woken_seq,r8), r0
mov.l @(woken_seq+4,r8), r1
mov.l @(wakeup_seq,r8), r2
mov.l @(wakeup_seq+4,r8), r3
cmp/eq r3, r11
bf 7f
cmp/eq r2, r10
bt 8b
7:
cmp/eq r1, r3
bf 9f
cmp/eq r0, r2
bt 8b
9:
mov #1, r2
mov #0, r3
clrt
mov.l @(woken_seq,r8),r0
mov.l @(woken_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(woken_seq,r8)
mov.l r1,@(woken_seq+4,r8)
16:
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8),r0
sub r2, r0
mov.l r0,@(cond_nwaiters,r8)
/* Wake up a thread which wants to destroy the condvar object. */
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
and r1, r0
not r0, r0
cmp/eq #0, r0
bf/s 17f
mov #((1 << nwaiters_shift) - 1), r1
not r1, r1
mov.l @(cond_nwaiters,r8),r0
tst r1, r0
bf 17f
mov r8, r4
add #cond_nwaiters, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff0, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
17:
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 10f
11:
mov.l .Lmlocki0, r1
bsrf r1
mov r9, r4
.Lmlocki0b:
/* We return the result of the mutex_lock operation. */
14:
add #48, r15
lds.l @r15+, pr
mov.l @r15+, r12
mov.l @r15+, r11
mov.l @r15+, r10
mov.l @r15+, r9
rts
mov.l @r15+, r8
#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff0:
.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif
.align 2
.Lmunlock0:
.long __pthread_mutex_unlock_usercnt-.Lmunlock0b
.Lenable0:
.long __pthread_enable_asynccancel-.Lenable0b
.Ldisable0:
.long __pthread_disable_asynccancel-.Ldisable0b
.Lmlocki0:
.long __pthread_mutex_cond_lock-.Lmlocki0b
1:
/* Initial locking failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait0, r1
bsrf r1
mov r2, r4
.Lwait0b:
bra 2b
nop
3:
/* Unlock in loop requires waekup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake0, r1
bsrf r1
extu.b r5, r5
.Lwake0b:
bra 4b
nop
5:
/* Locking in loop failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait1, r1
bsrf r1
mov r2, r4
.Lwait1b:
bra 6b
nop
10:
/* Unlock after loop requires wakeup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake1, r1
bsrf r1
extu.b r5, r5
.Lwake1b:
bra 11b
nop
12:
/* The initial unlocking of the mutex failed. */
mov.l r0, @(12,r15)
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 13f
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake2, r1
bsrf r1
extu.b r5, r5
.Lwake2b:
13:
bra 14b
mov.l @(12,r15), r0
.align 2
.Lwait0:
.long __lll_lock_wait-.Lwait0b
.Lwake0:
.long __lll_unlock_wake-.Lwake0b
.Lwait1:
.long __lll_lock_wait-.Lwait1b
.Lwake1:
.long __lll_unlock_wake-.Lwake1b
.Lwake2:
.long __lll_unlock_wake-.Lwake2b
.size __pthread_cond_wait, .-__pthread_cond_wait
versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait,
GLIBC_2_3_2)
.type __condvar_w_cleanup, @function
__condvar_w_cleanup:
mov r4, r11
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bt 1f
nop
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait3, r1
bsrf r1
mov r2, r4
.Lwait3b:
1:
mov.l @(broadcast_seq,r8), r0
mov.l @(4,r15), r1
cmp/eq r0, r1
bf 3f
mov #1, r2
mov #0, r3
/* We increment the wakeup_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
mov.l @(total_seq+4,r8), r0
mov.l @(wakeup_seq+4,r8), r1
cmp/hi r1, r0
bt/s 6f
cmp/hi r0, r1
bt 7f
mov.l @(total_seq,r8), r0
mov.l @(wakeup_seq,r8), r1
cmp/hs r0, r1
bt 7f
6:
clrt
mov.l @(wakeup_seq,r8),r0
mov.l @(wakeup_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(wakeup_seq,r8)
mov.l r1,@(wakeup_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
7:
clrt
mov.l @(woken_seq,r8),r0
mov.l @(woken_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(woken_seq,r8)
mov.l r1,@(woken_seq+4,r8)
3:
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8),r0
sub r2, r0
mov.l r0,@(cond_nwaiters,r8)
/* Wake up a thread which wants to destroy the condvar object. */
mov #0, r10
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
and r1, r0
not r0, r0
cmp/eq #0, r0
bf/s 4f
mov #((1 << nwaiters_shift) - 1), r1
not r1, r1
mov.l @(cond_nwaiters,r8),r0
tst r1, r0
bf 4f
mov r8, r4
add #cond_nwaiters, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff1, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov #1, r10
4:
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bt 2f
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake3, r1
bsrf r1
extu.b r5, r5
.Lwake3b:
2:
/* Wake up all waiters to make sure no signal gets lost. */
tst r10, r10
bf/s 5f
mov r8, r4
add #cond_futex, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff1, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #-1, r6
shlr r6 /* r6 = 0x7fffffff */
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
5:
mov.l .Lmlocki3, r1
bsrf r1
mov r9, r4
.Lmlocki3b:
.LcallUR:
mov.l .Lresume, r1
#ifdef PIC
add r12, r1
#endif
jsr @r1
mov r11, r4
sleep
#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff1:
.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif
.align 2
.Lwait3:
.long __lll_lock_wait-.Lwait3b
.Lwake3:
.long __lll_unlock_wake-.Lwake3b
.Lmlocki3:
.long __pthread_mutex_cond_lock-.Lmlocki3b
.Lresume:
#ifdef PIC
.long _Unwind_Resume@GOTOFF
#else
.long _Unwind_Resume
#endif
.LENDCODE:
cfi_endproc
.size __condvar_w_cleanup, .-__condvar_w_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte DW_EH_PE_omit ! @LPStart format (omit)
.byte DW_EH_PE_omit ! @TType format (omit)
.byte DW_EH_PE_sdata4 ! call-site format
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.ualong .LcleanupSTART-.LSTARTCODE
.ualong .LcleanupEND-.LcleanupSTART
.ualong __condvar_w_cleanup-.LSTARTCODE
.uleb128 0
.ualong .LcallUR-.LSTARTCODE
.ualong .LENDCODE-.LcallUR
.ualong 0
.uleb128 0
.Lcstend:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align 4
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
.long __gcc_personality_v0
#endif
|
