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/arch/sh/include/asm/futex.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 77 lines | 62 code | 14 blank | 1 comment | 8 complexity | f5e0f8157eeec49996cc4760777083b7 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 1#ifndef __ASM_SH_FUTEX_H
 2#define __ASM_SH_FUTEX_H
 3
 4#ifdef __KERNEL__
 5
 6#include <linux/futex.h>
 7#include <linux/uaccess.h>
 8#include <asm/errno.h>
 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 */