1
2#ifndef _ASM_PARISC_FUTEX_H
3#define _ASM_PARISC_FUTEX_H
4
5#ifdef __KERNEL__
6
7#include <linux/futex.h>
8#include <linux/uaccess.h>
9#include <asm/atomic.h>
10#include <asm/errno.h>
11
12
13
14
15static inline void
16_futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags)
17{
18 extern u32 lws_lock_start[];
19 long index = ((long)uaddr & 0x3f8) >> 1;
20 arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
21 local_irq_save(*flags);
22 arch_spin_lock(s);
23}
24
25static inline void
26_futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags)
27{
28 extern u32 lws_lock_start[];
29 long index = ((long)uaddr & 0x3f8) >> 1;
30 arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
31 arch_spin_unlock(s);
32 local_irq_restore(*flags);
33}
34
35static inline int
36arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
37{
38 unsigned long int flags;
39 int oldval, ret;
40 u32 tmp;
41
42 _futex_spin_lock_irqsave(uaddr, &flags);
43
44 ret = -EFAULT;
45 if (unlikely(get_user(oldval, uaddr) != 0))
46 goto out_pagefault_enable;
47
48 ret = 0;
49 tmp = oldval;
50
51 switch (op) {
52 case FUTEX_OP_SET:
53 tmp = oparg;
54 break;
55 case FUTEX_OP_ADD:
56 tmp += oparg;
57 break;
58 case FUTEX_OP_OR:
59 tmp |= oparg;
60 break;
61 case FUTEX_OP_ANDN:
62 tmp &= ~oparg;
63 break;
64 case FUTEX_OP_XOR:
65 tmp ^= oparg;
66 break;
67 default:
68 ret = -ENOSYS;
69 }
70
71 if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
72 ret = -EFAULT;
73
74out_pagefault_enable:
75 _futex_spin_unlock_irqrestore(uaddr, &flags);
76
77 if (!ret)
78 *oval = oldval;
79
80 return ret;
81}
82
83static inline int
84futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
85 u32 oldval, u32 newval)
86{
87 u32 val;
88 unsigned long flags;
89
90
91
92
93 if (uaccess_kernel() && !uaddr)
94 return -EFAULT;
95
96 if (!access_ok(uaddr, sizeof(u32)))
97 return -EFAULT;
98
99
100
101
102
103
104
105 _futex_spin_lock_irqsave(uaddr, &flags);
106 if (unlikely(get_user(val, uaddr) != 0)) {
107 _futex_spin_unlock_irqrestore(uaddr, &flags);
108 return -EFAULT;
109 }
110
111 if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) {
112 _futex_spin_unlock_irqrestore(uaddr, &flags);
113 return -EFAULT;
114 }
115
116 *uval = val;
117 _futex_spin_unlock_irqrestore(uaddr, &flags);
118
119 return 0;
120}
121
122#endif
123#endif
124