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review.evervolv.com / android_kernel_htc_msm8960 / cee9e8c5cb1554e9e85ad764d27b6c808555ed89 / . / include / asm-parisc / futex.h
blob: dbee6e60aa8139e66897ba65ba4ac9155bf00dab [file] [log] [blame]
Carlos O'Donell342a0492006-09-07 13:05:17 -0400[diff] [blame]1#ifndef _ASM_PARISC_FUTEX_H
2#define _ASM_PARISC_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]3
Carlos O'Donell342a0492006-09-07 13:05:17 -0400[diff] [blame]4#ifdef __KERNEL__
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]5
Carlos O'Donell342a0492006-09-07 13:05:17 -0400[diff] [blame]6#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 -0800[diff] [blame]24 pagefault_disable();
Carlos O'Donell342a0492006-09-07 13:05:17 -0400[diff] [blame]25
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 -0800[diff] [blame]36 pagefault_enable();
Carlos O'Donell342a0492006-09-07 13:05:17 -0400[diff] [blame]37
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
59 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
60 return -EFAULT;
61
62 err = get_user(uval, uaddr);
63 if (err) return -EFAULT;
64 if (uval == oldval)
65 err = put_user(newval, uaddr);
66 if (err) return -EFAULT;
67 return uval;
68}
69
70#endif
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]71#endif