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4732efbe JJ |
1 | #ifndef _ASM_FUTEX_H |
2 | #define _ASM_FUTEX_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | ||
6 | #include <linux/futex.h> | |
7 | #include <asm/errno.h> | |
8 | #include <asm/uaccess.h> | |
9 | ||
10 | static inline int | |
11 | futex_atomic_op_inuser (int encoded_op, int __user *uaddr) | |
12 | { | |
13 | int op = (encoded_op >> 28) & 7; | |
14 | int cmp = (encoded_op >> 24) & 15; | |
15 | int oparg = (encoded_op << 8) >> 20; | |
16 | int cmparg = (encoded_op << 20) >> 20; | |
17 | int oldval = 0, ret, tem; | |
18 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
19 | oparg = 1 << oparg; | |
20 | ||
21 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | |
22 | return -EFAULT; | |
23 | ||
24 | inc_preempt_count(); | |
25 | ||
26 | switch (op) { | |
27 | case FUTEX_OP_SET: | |
28 | case FUTEX_OP_ADD: | |
29 | case FUTEX_OP_OR: | |
30 | case FUTEX_OP_ANDN: | |
31 | case FUTEX_OP_XOR: | |
32 | default: | |
33 | ret = -ENOSYS; | |
34 | } | |
35 | ||
36 | dec_preempt_count(); | |
37 | ||
38 | if (!ret) { | |
39 | switch (cmp) { | |
40 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
41 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
42 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
43 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
44 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
45 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
46 | default: ret = -ENOSYS; | |
47 | } | |
48 | } | |
49 | return ret; | |
50 | } | |
51 | ||
52 | #endif | |
53 | #endif |