projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 342a0497 CD |
1 | #ifndef _ASM_PARISC_FUTEX_H |
| 2 | #define _ASM_PARISC_FUTEX_H | |
| 4732efbe | 3 | |
| 342a0497 | 4 | #ifdef __KERNEL__ |
| 4732efbe | 5 | |
| 342a0497 CD |
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; | |
| 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 | |
| 54 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | |
| 55 | { | |
| 56 | int err = 0; | |
| 57 | int uval; | |
| 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 | ||
| 68 | err = get_user(uval, uaddr); | |
| 69 | if (err) return -EFAULT; | |
| 70 | if (uval == oldval) | |
| 71 | err = put_user(newval, uaddr); | |
| 72 | if (err) return -EFAULT; | |
| 73 | return uval; | |
| 74 | } | |
| 75 | ||
| c20a84c9 KM |
76 | #endif /*__KERNEL__*/ |
| 77 | #endif /*_ASM_PARISC_FUTEX_H*/ |