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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 | |
8 | static inline int |
9 | futex_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 | |
50 | static inline int |
51 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) |
52 | { |
53 | return -ENOSYS; |
54 | } |
55 | |
56 | #endif |
57 |
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