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fc1d4c9c KK |
1 | #ifndef __ASM_SH_FUTEX_H |
2 | #define __ASM_SH_FUTEX_H | |
4732efbe | 3 | |
fc1d4c9c | 4 | #ifdef __KERNEL__ |
4732efbe | 5 | |
fc1d4c9c KK |
6 | #include <linux/futex.h> |
7 | #include <asm/errno.h> | |
8 | #include <asm/uaccess.h> | |
9 | ||
10 | /* XXX: UP variants, fix for SH-4A and SMP.. */ | |
11 | #include <asm/futex-irq.h> | |
12 | ||
13 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) | |
14 | { | |
15 | int op = (encoded_op >> 28) & 7; | |
16 | int cmp = (encoded_op >> 24) & 15; | |
17 | int oparg = (encoded_op << 8) >> 20; | |
18 | int cmparg = (encoded_op << 20) >> 20; | |
19 | int oldval = 0, ret; | |
20 | ||
21 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
22 | oparg = 1 << oparg; | |
23 | ||
24 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | |
25 | return -EFAULT; | |
26 | ||
27 | pagefault_disable(); | |
28 | ||
29 | switch (op) { | |
30 | case FUTEX_OP_SET: | |
31 | ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval); | |
32 | break; | |
33 | case FUTEX_OP_ADD: | |
34 | ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval); | |
35 | break; | |
36 | case FUTEX_OP_OR: | |
37 | ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval); | |
38 | break; | |
39 | case FUTEX_OP_ANDN: | |
40 | ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval); | |
41 | break; | |
42 | case FUTEX_OP_XOR: | |
43 | ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval); | |
44 | break; | |
45 | default: | |
46 | ret = -ENOSYS; | |
47 | break; | |
48 | } | |
49 | ||
50 | pagefault_enable(); | |
51 | ||
52 | if (!ret) { | |
53 | switch (cmp) { | |
54 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
55 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
56 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
57 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
58 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
59 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
60 | default: ret = -ENOSYS; | |
61 | } | |
62 | } | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | static inline int | |
68 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | |
69 | { | |
70 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | |
71 | return -EFAULT; | |
72 | ||
73 | return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval); | |
74 | } | |
75 | ||
76 | #endif /* __KERNEL__ */ | |
77 | #endif /* __ASM_SH_FUTEX_H */ |