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342a0497 CD |
1 | #ifndef _ASM_PARISC_FUTEX_H |
2 | #define _ASM_PARISC_FUTEX_H | |
4732efbe | 3 | |
342a0497 | 4 | #ifdef __KERNEL__ |
4732efbe | 5 | |
342a0497 | 6 | #include <linux/futex.h> |
730f412c | 7 | #include <linux/uaccess.h> |
342a0497 | 8 | #include <asm/errno.h> |
342a0497 CD |
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; | |
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 | ||
a866374a | 24 | pagefault_disable(); |
342a0497 CD |
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 | ||
a866374a | 36 | pagefault_enable(); |
342a0497 CD |
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 | /* Non-atomic version */ | |
53 | static inline int | |
37a9d912 ML |
54 | futex_atomic_cmpxchg_inatomic(int *uval, int __user *uaddr, |
55 | int oldval, int newval) | |
342a0497 | 56 | { |
37a9d912 | 57 | int val; |
342a0497 | 58 | |
c20a84c9 KM |
59 | /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is |
60 | * our gateway page, and causes no end of trouble... | |
61 | */ | |
62 | if (segment_eq(KERNEL_DS, get_fs()) && !uaddr) | |
63 | return -EFAULT; | |
64 | ||
342a0497 CD |
65 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) |
66 | return -EFAULT; | |
67 | ||
37a9d912 ML |
68 | if (get_user(val, uaddr)) |
69 | return -EFAULT; | |
70 | if (val == oldval && put_user(newval, uaddr)) | |
71 | return -EFAULT; | |
72 | *uval = val; | |
73 | return 0; | |
342a0497 CD |
74 | } |
75 | ||
c20a84c9 KM |
76 | #endif /*__KERNEL__*/ |
77 | #endif /*_ASM_PARISC_FUTEX_H*/ |