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review.evervolv.com / android_kernel_htc_msm8960 / 6ba653830c85a37d0a054f1e43d9b51e59d1150b / . / arch / sh / include / asm / futex.h
blob: 68256ec5fa35b3e2c46ead9e2566810583351dcd [file] [log] [blame]
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]1#ifndef __ASM_SH_FUTEX_H
2#define __ASM_SH_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]3
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]4#ifdef __KERNEL__
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]5
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]6#include <linux/futex.h>
Jeff Dike730f4122008-04-30 00:54:49 -0700[diff] [blame]7#include <linux/uaccess.h>
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]8#include <asm/errno.h>
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]9
10/* XXX: UP variants, fix for SH-4A and SMP.. */
11#include <asm/futex-irq.h>
12
13static 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
67static inline int
68futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
69{
70 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
71 return -EFAULT;
72
73 return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval);
74}
75
76#endif /* __KERNEL__ */
77#endif /* __ASM_SH_FUTEX_H */