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
|
/* Copyright (C) 2003-2013 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 <pthread-errnos.h>
#include <lowlevellock.h>
#include <lowlevelrobustlock.h>
#include <kernel-features.h>
#include "lowlevel-atomic.h"
.text
#define FUTEX_WAITERS 0x80000000
#define FUTEX_OWNER_DIED 0x40000000
#ifdef __ASSUME_PRIVATE_FUTEX
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
mov #(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), tmp; \
extu.b tmp, tmp; \
xor tmp, reg
#else
# if FUTEX_WAIT == 0
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg
# else
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg ; \
mov #FUTEX_WAIT, tmp ; \
or tmp, reg
# endif
#endif
.globl __lll_robust_lock_wait
.type __lll_robust_lock_wait,@function
.hidden __lll_robust_lock_wait
.align 5
cfi_startproc
__lll_robust_lock_wait:
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r5, r8
mov #0, r7 /* No timeout. */
mov r6, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
4:
mov r4, r6
mov.l .L_FUTEX_WAITERS, r0
or r0, r6
shlr r0 /* r0 = FUTEX_OWNER_DIED */
tst r0, r4
bf/s 3f
cmp/eq r4, r6
bt 1f
CMPXCHG (r4, @r8, r6, r2)
bf 2f
1:
mov r8, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov.l @r8, r2
2:
tst r2, r2
bf/s 4b
mov r2, r4
stc gbr, r1
mov.w .Ltidoff, r2
add r2, r1
mov.l @r1, r6
mov #0, r3
CMPXCHG (r3, @r8, r6, r4)
bf 4b
mov #0, r4
3:
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
ret
mov r4, r0
cfi_endproc
.align 2
.L_FUTEX_WAITERS:
.long FUTEX_WAITERS
.Ltidoff:
.word TID - TLS_PRE_TCB_SIZE
.size __lll_robust_lock_wait,.-__lll_robust_lock_wait
.globl __lll_robust_timedlock_wait
.type __lll_robust_timedlock_wait,@function
.hidden __lll_robust_timedlock_wait
.align 5
cfi_startproc
__lll_robust_timedlock_wait:
/* Check for a valid timeout value. */
mov.l @(4,r6), r1
mov.l .L1g, r0
cmp/hs r0, r1
bt 3f
cfi_remember_state
mov.l r11, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r11, 0)
mov.l r10, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r10, 0)
mov.l r9, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r9, 0)
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r7, r11
mov r4, r10
mov r6, r9
mov r5, r8
/* Stack frame for the timespec and timeval structs. */
add #-8, r15
cfi_adjust_cfa_offset(8)
1:
/* Get current time. */
mov r15, r4
mov #0, r5
mov #__NR_gettimeofday, r3
trapa #0x12
SYSCALL_INST_PAD
/* Compute relative timeout. */
mov.l @(4,r15), r0
mov.w .L1k, r1
dmulu.l r0, r1 /* Micro seconds to nano seconds. */
mov.l @r9, r2
mov.l @(4,r9), r3
mov.l @r15, r0
sts macl, r1
sub r0, r2
clrt
subc r1, r3
bf 4f
mov.l .L1g, r1
add r1, r3
add #-1, r2
4:
cmp/pz r2
bf 8f /* Time is already up. */
mov.l r2, @r15 /* Store relative timeout. */
mov.l r3, @(4,r15)
mov r10, r6
mov.l .L_FUTEX_WAITERS2, r0
or r0, r6
shlr r0 /* r0 = FUTEX_OWNER_DIED */
tst r0, r4
bf/s 6f
cmp/eq r4, r6
bt 2f
CMPXCHG (r4, @r8, r6, r2)
bf/s 5f
mov #0, r5
2:
mov r8, r4
mov r11, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
mov r10, r6
mov r15, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov r0, r5
mov.l @r8, r2
5:
tst r2, r2
bf/s 7f
mov r2, r10
stc gbr, r1
mov.w .Ltidoff2, r2
add r2, r1
mov.l @r1, r4
mov #0, r3
CMPXCHG (r3, @r8, r4, r10)
bf 7f
mov #0, r0
6:
cfi_remember_state
add #8, r15
cfi_adjust_cfa_offset (-8)
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
mov.l @r15+, r9
cfi_adjust_cfa_offset (-4)
cfi_restore (r9)
mov.l @r15+, r10
cfi_adjust_cfa_offset (-4)
cfi_restore (r10)
rts
mov.l @r15+, r11
/* Omit CFI for restore in delay slot. */
cfi_restore_state
7:
/* Check whether the time expired. */
mov #-ETIMEDOUT, r1
cmp/eq r5, r1
bf 1b
8:
bra 6b
mov #ETIMEDOUT, r0
cfi_restore_state
3:
rts
mov #EINVAL, r0
cfi_endproc
.align 2
.L_FUTEX_WAITERS2:
.long FUTEX_WAITERS
.L1g:
.long 1000000000
.Ltidoff2:
.word TID - TLS_PRE_TCB_SIZE
.L1k:
.word 1000
.size __lll_robust_timedlock_wait,.-__lll_robust_timedlock_wait
|
