1 #ifndef _ASM_S390_FUTEX_H
2 #define _ASM_S390_FUTEX_H
3
4 #ifdef __KERNEL__
5
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
8 #include <asm/errno.h>
9
futex_atomic_op_inuser(int encoded_op,u32 __user * uaddr)10 static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
11 {
12 int op = (encoded_op >> 28) & 7;
13 int cmp = (encoded_op >> 24) & 15;
14 int oparg = (encoded_op << 8) >> 20;
15 int cmparg = (encoded_op << 20) >> 20;
16 int oldval, ret;
17
18 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
19 oparg = 1 << oparg;
20
21 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
22 return -EFAULT;
23
24 pagefault_disable();
25 ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval);
26 pagefault_enable();
27
28 if (!ret) {
29 switch (cmp) {
30 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
31 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
32 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
33 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
34 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
35 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
36 default: ret = -ENOSYS;
37 }
38 }
39 return ret;
40 }
41
futex_atomic_cmpxchg_inatomic(u32 * uval,u32 __user * uaddr,u32 oldval,u32 newval)42 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
43 u32 oldval, u32 newval)
44 {
45 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
46 return -EFAULT;
47
48 return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval);
49 }
50
51 #endif /* __KERNEL__ */
52 #endif /* _ASM_S390_FUTEX_H */
53