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
|
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <pthread-errnos.h>
.text
#ifndef LOCK
# ifdef UP
# define LOCK
# else
# define LOCK lock
# endif
#endif
#define SYS_futex 202
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
/* For the calculation see asm/vsyscall.h. */
#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
.globl __lll_mutex_lock_wait
.type __lll_mutex_lock_wait,@function
.hidden __lll_mutex_lock_wait
.align 16
__lll_mutex_lock_wait:
pushq %r10
pushq %rdx
/* In the loop we are going to add 2 instead of 1 which is what
the caller did. Account for that. */
decq %rsi
xorq %r10, %r10 /* No timeout. */
1:
leaq 2(%rsi), %rdx /* account for the preceeded xadd. */
movq %r10, %rsi /* movq $FUTEX_WAIT, %rsi */
movq $SYS_futex, %rax
syscall
movl $2, %esi
LOCK
xaddl %esi, (%rdi)
testl %esi, %esi
jne 1b
popq %rdx
popq %r10
retq
.size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait
#ifdef NOT_IN_libc
.globl __lll_mutex_timedlock_wait
.type __lll_mutex_timedlock_wait,@function
.hidden __lll_mutex_timedlock_wait
.align 16
__lll_mutex_timedlock_wait:
/* Check for a valid timeout value. */
cmpq $1000000000, 8(%rdx)
jae 3f
pushq %r12
pushq %r13
pushq %r14
/* Stack frame for the timespec and timeval structs. */
subq $16, %rsp
movq %rdi, %r12
movq %rdx, %r13
1: leaq 1(%rax), %r14
/* Get current time. */
movq %rsp, %rdi
xorq %rsi, %rsi
movq $VSYSCALL_ADDR_vgettimeofday, %rax
/* This is a regular function call, all calleer-save registers
might be clobbered. */
callq *%rax
/* Compute relative timeout. */
movq 8(%rsp), %rax
movq $1000, %rdi
mul %rdi /* Milli seconds to nano seconds. */
movq (%r13), %rdi
movq 8(%r13), %rsi
subq (%rsp), %rdi
subq %rax, %rsi
jns 4f
addq $1000000000, %rsi
decq %rdi
4: testq %rdi, %rdi
js 5f /* Time is already up. */
/* Futex call. */
movq %rdi, (%rsp) /* Store relative timeout. */
movq %rsi, 8(%rsp)
movl %r14d, %edx
movq %rsp, %r10
xorq %rsi, %rsi /* movq $FUTEX_WAIT, %rsi */
movq %r12, %rdi
movq $SYS_futex, %rax
syscall
movq %rax, %rcx
movl $1, %eax
LOCK
xaddl %eax, (%rdi)
testl %eax, %eax
jne 7f
movl $2, (%rdi)
xorl %eax, %eax
8: addq $16, %rsp
popq %r14
popq %r13
popq %r12
retq
/* Check whether the time expired. */
7: cmpq $-ETIMEDOUT, %rcx
je 5f
jmp 1b
3: movl $EINVAL, %eax
retq
5: movl $ETIMEDOUT, %eax
jmp 8b
.size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait
#endif
.globl __lll_mutex_unlock_wake
.type __lll_mutex_unlock_wake,@function
.hidden __lll_mutex_unlock_wake
.align 16
__lll_mutex_unlock_wake:
pushq %rsi
pushq %rdx
movl $0, (%rdi)
movq $FUTEX_WAKE, %rsi
movl $1, %edx /* Wake one thread. */
movq $SYS_futex, %rax
syscall
popq %rdx
popq %rsi
retq
.size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake
|
