summaryrefslogblamecommitdiff
path: root/include/asm-parisc/futex.h
blob: dbee6e60aa8139e66897ba65ba4ac9155bf00dab (plain) (tree) 
342a0497c23c ^


4732efbeb997 ^

342a0497c23c ^

4732efbeb997 ^

342a0497c23c ^


















a866374aecc9 ^

342a0497c23c ^











a866374aecc9 ^

342a0497c23c ^


































4732efbeb997 ^

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


                           
 
                 
 

















                                                           
                            










                              
                           

































                                                                        
      
#ifndef _ASM_PARISC_FUTEX_H
#define _ASM_PARISC_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <asm/errno.h>
#include <asm/uaccess.h>

static inline int
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
	int op = (encoded_op >> 28) & 7;
	int cmp = (encoded_op >> 24) & 15;
	int oparg = (encoded_op << 8) >> 20;
	int cmparg = (encoded_op << 20) >> 20;
	int oldval = 0, ret;
	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
		oparg = 1 << oparg;

	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
		return -EFAULT;

	pagefault_disable();

	switch (op) {
	case FUTEX_OP_SET:
	case FUTEX_OP_ADD:
	case FUTEX_OP_OR:
	case FUTEX_OP_ANDN:
	case FUTEX_OP_XOR:
	default:
		ret = -ENOSYS;
	}

	pagefault_enable();

	if (!ret) {
		switch (cmp) {
		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
		default: ret = -ENOSYS;
		}
	}
	return ret;
}

/* Non-atomic version */
static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
	int err = 0;
	int uval;

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
		return -EFAULT;

	err = get_user(uval, uaddr);
	if (err) return -EFAULT;
	if (uval == oldval)
		err = put_user(newval, uaddr);
	if (err) return -EFAULT;
	return uval;
}

#endif
#endif