1 #ifndef _ASM_GENERIC_FUTEX_H
2 #define _ASM_GENERIC_FUTEX_H
3
4 #include <linux/futex.h>
5 #include <linux/uaccess.h>
6 #include <asm/errno.h>
7
8 static inline int
futex_atomic_op_inuser(int encoded_op,u32 __user * uaddr)9 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
10 {
11 int op = (encoded_op >> 28) & 7;
12 int cmp = (encoded_op >> 24) & 15;
13 int oparg = (encoded_op << 8) >> 20;
14 int cmparg = (encoded_op << 20) >> 20;
15 int oldval = 0, ret;
16 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
17 oparg = 1 << oparg;
18
19 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
20 return -EFAULT;
21
22 pagefault_disable();
23
24 switch (op) {
25 case FUTEX_OP_SET:
26 case FUTEX_OP_ADD:
27 case FUTEX_OP_OR:
28 case FUTEX_OP_ANDN:
29 case FUTEX_OP_XOR:
30 default:
31 ret = -ENOSYS;
32 }
33
34 pagefault_enable();
35
36 if (!ret) {
37 switch (cmp) {
38 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
39 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
40 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
41 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
42 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
43 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
44 default: ret = -ENOSYS;
45 }
46 }
47 return ret;
48 }
49
50 static inline int
futex_atomic_cmpxchg_inatomic(u32 * uval,u32 __user * uaddr,u32 oldval,u32 newval)51 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
52 u32 oldval, u32 newval)
53 {
54 return -ENOSYS;
55 }
56
57 #endif
58