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, u32 __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(u32)))
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(u32 *uval, u32 __user *uaddr,
69			      u32 oldval, u32 newval)
70{
71	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
72		return -EFAULT;
73
74	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
75}
76
77#endif /* __KERNEL__ */
78#endif /* __ASM_SH_FUTEX_H */
79