Root/include/asm-generic/futex.h

1#ifndef _ASM_GENERIC_FUTEX_H
2#define _ASM_GENERIC_FUTEX_H
3
4#include <linux/futex.h>
5#include <linux/uaccess.h>
6#include <asm/errno.h>
7
8static inline int
9futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
10{
11    int op = (encoded_op >> 28) & 7;
12    int cmp = (encoded_op >> 24) & 15;
13    int oparg = (encoded_op << 8) >> 20;
14    int cmparg = (encoded_op << 20) >> 20;
15    int oldval = 0, ret;
16    if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
17        oparg = 1 << oparg;
18
19    if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
20        return -EFAULT;
21
22    pagefault_disable();
23
24    switch (op) {
25    case FUTEX_OP_SET:
26    case FUTEX_OP_ADD:
27    case FUTEX_OP_OR:
28    case FUTEX_OP_ANDN:
29    case FUTEX_OP_XOR:
30    default:
31        ret = -ENOSYS;
32    }
33
34    pagefault_enable();
35
36    if (!ret) {
37        switch (cmp) {
38        case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
39        case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
40        case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
41        case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
42        case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
43        case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
44        default: ret = -ENOSYS;
45        }
46    }
47    return ret;
48}
49
50static inline int
51futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
52{
53    return -ENOSYS;
54}
55
56#endif
57

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