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Carlos O'Donell342a0492006-09-07 13:05:17 -04001#ifndef _ASM_PARISC_FUTEX_H
2#define _ASM_PARISC_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -07003
Carlos O'Donell342a0492006-09-07 13:05:17 -04004#ifdef __KERNEL__
Jakub Jelinek4732efb2005-09-06 15:16:25 -07005
Carlos O'Donell342a0492006-09-07 13:05:17 -04006#include <linux/futex.h>
7#include <asm/errno.h>
8#include <asm/uaccess.h>
9
10static inline int
11futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
12{
13 int op = (encoded_op >> 28) & 7;
14 int cmp = (encoded_op >> 24) & 15;
15 int oparg = (encoded_op << 8) >> 20;
16 int cmparg = (encoded_op << 20) >> 20;
17 int oldval = 0, ret;
18 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
19 oparg = 1 << oparg;
20
21 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
22 return -EFAULT;
23
Peter Zijlstraa8663742006-12-06 20:32:20 -080024 pagefault_disable();
Carlos O'Donell342a0492006-09-07 13:05:17 -040025
26 switch (op) {
27 case FUTEX_OP_SET:
28 case FUTEX_OP_ADD:
29 case FUTEX_OP_OR:
30 case FUTEX_OP_ANDN:
31 case FUTEX_OP_XOR:
32 default:
33 ret = -ENOSYS;
34 }
35
Peter Zijlstraa8663742006-12-06 20:32:20 -080036 pagefault_enable();
Carlos O'Donell342a0492006-09-07 13:05:17 -040037
38 if (!ret) {
39 switch (cmp) {
40 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
41 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
42 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
43 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
44 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
45 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
46 default: ret = -ENOSYS;
47 }
48 }
49 return ret;
50}
51
52/* Non-atomic version */
53static inline int
54futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
55{
56 int err = 0;
57 int uval;
58
Kyle McMartinc20a84c2008-03-01 10:25:52 -080059 /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
60 * our gateway page, and causes no end of trouble...
61 */
62 if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
63 return -EFAULT;
64
Carlos O'Donell342a0492006-09-07 13:05:17 -040065 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
66 return -EFAULT;
67
68 err = get_user(uval, uaddr);
69 if (err) return -EFAULT;
70 if (uval == oldval)
71 err = put_user(newval, uaddr);
72 if (err) return -EFAULT;
73 return uval;
74}
75
Kyle McMartinc20a84c2008-03-01 10:25:52 -080076#endif /*__KERNEL__*/
77#endif /*_ASM_PARISC_FUTEX_H*/