1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#include <sys/linux-syscalls.h>
29#include <machine/asm.h>
30#include <machine/cpu-features.h>
31
32#define FUTEX_WAIT 0
33#define FUTEX_WAKE 1
34
35/* __futex_wait(*ftx, val, *timespec) */
36/* __futex_wake(*ftx, counter) */
37/* __futex_syscall3(*ftx, op, val) */
38/* __futex_syscall4(*ftx, op, val, *timespec) */
39
40.global __futex_wait
41.type __futex_wait, %function
42
43.global __futex_wake
44.type __futex_wake, %function
45
46.global __futex_syscall3
47.type __futex_syscall3, %function
48
49.global __futex_syscall4
50.type __futex_syscall4, %function
51
52#if __ARM_EABI__
53
54ENTRY(__futex_syscall3)
55    stmdb   sp!, {r4, r7}
56    .save   {r4, r7}
57    ldr     r7, =__NR_futex
58    swi     #0
59    ldmia   sp!, {r4, r7}
60    bx      lr
61END(__futex_syscall3)
62
63ENTRY(__futex_wait)
64    stmdb   sp!, {r4, r7}
65    .save   {r4, r7}
66    mov     r3, r2
67    mov     r2, r1
68    mov     r1, #FUTEX_WAIT
69    ldr     r7, =__NR_futex
70    swi     #0
71    ldmia   sp!, {r4, r7}
72    bx      lr
73END(__futex_wait)
74
75ENTRY(__futex_wake)
76    .save   {r4, r7}
77    stmdb   sp!, {r4, r7}
78    mov     r2, r1
79    mov     r1, #FUTEX_WAKE
80    ldr     r7, =__NR_futex
81    swi     #0
82    ldmia   sp!, {r4, r7}
83    bx      lr
84END(__futex_wake)
85
86#else
87
88ENTRY(__futex_syscall3)
89    swi     #__NR_futex
90    bx      lr
91END(__futex_syscall3)
92
93ENTRY(__futex_wait)
94    mov     r3, r2
95    mov     r2, r1
96    mov     r1, #FUTEX_WAIT
97    swi     #__NR_futex
98    bx      lr
99END(__futex_wait)
100
101ENTRY(__futex_wake)
102    mov     r2, r1
103    mov     r1, #FUTEX_WAKE
104    swi     #__NR_futex
105    bx      lr
106END(__futex_wake)
107
108#endif
109
110ENTRY(__futex_syscall4)
111    b __futex_syscall3
112END(__futex_syscall4)
113