a8a5125dc9b43dc973167af680d63ff4edc18676
[linux-3.10.git] / arch / sh / include / asm / futex.h
1 #ifndef __ASM_SH_FUTEX_H
2 #define __ASM_SH_FUTEX_H
3
4 #ifdef __KERNEL__
5
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
8 #include <asm/errno.h>
9
10 /* XXX: UP variants, fix for SH-4A and SMP.. */
11 #include <asm/futex-irq.h>
12
13 static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
14 {
15         int op = (encoded_op >> 28) & 7;
16         int cmp = (encoded_op >> 24) & 15;
17         int oparg = (encoded_op << 8) >> 20;
18         int cmparg = (encoded_op << 20) >> 20;
19         int oldval = 0, ret;
20
21         if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
22                 oparg = 1 << oparg;
23
24         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
25                 return -EFAULT;
26
27         pagefault_disable();
28
29         switch (op) {
30         case FUTEX_OP_SET:
31                 ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
32                 break;
33         case FUTEX_OP_ADD:
34                 ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
35                 break;
36         case FUTEX_OP_OR:
37                 ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
38                 break;
39         case FUTEX_OP_ANDN:
40                 ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
41                 break;
42         case FUTEX_OP_XOR:
43                 ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
44                 break;
45         default:
46                 ret = -ENOSYS;
47                 break;
48         }
49
50         pagefault_enable();
51
52         if (!ret) {
53                 switch (cmp) {
54                 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
55                 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
56                 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
57                 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
58                 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
59                 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
60                 default: ret = -ENOSYS;
61                 }
62         }
63
64         return ret;
65 }
66
67 static inline int
68 futex_atomic_cmpxchg_inatomic(int *uval, int __user *uaddr,
69                               int oldval, int newval)
70 {
71         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
72                 return -EFAULT;
73
74         return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
75 }
76
77 #endif /* __KERNEL__ */
78 #endif /* __ASM_SH_FUTEX_H */