]>
Commit | Line | Data |
---|---|---|
f8aaeace JD |
1 | #ifndef _ASM_GENERIC_FUTEX_H |
2 | #define _ASM_GENERIC_FUTEX_H | |
3 | ||
f8aaeace | 4 | #include <linux/futex.h> |
730f412c | 5 | #include <linux/uaccess.h> |
f8aaeace | 6 | #include <asm/errno.h> |
f8aaeace JD |
7 | |
8 | static inline int | |
8d7718aa | 9 | futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) |
f8aaeace JD |
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 | ||
8d7718aa | 19 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
f8aaeace JD |
20 | return -EFAULT; |
21 | ||
a866374a | 22 | pagefault_disable(); |
f8aaeace JD |
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 | ||
a866374a | 34 | pagefault_enable(); |
f8aaeace JD |
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 | ||
e9056f13 | 50 | static inline int |
8d7718aa ML |
51 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
52 | u32 oldval, u32 newval) | |
e9056f13 IM |
53 | { |
54 | return -ENOSYS; | |
55 | } | |
56 | ||
f8aaeace | 57 | #endif |