projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3363fbdd MS |
1 | #ifndef _ASM_S390_FUTEX_H |
| 2 | #define _ASM_S390_FUTEX_H | |
| 4732efbe | 3 | |
| 3363fbdd | 4 | #include <linux/futex.h> |
| d8ad075e | 5 | #include <linux/uaccess.h> |
| 3363fbdd | 6 | #include <asm/errno.h> |
| 3363fbdd | 7 | |
| 8d7718aa | 8 | static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) |
| 3363fbdd MS |
9 | { |
| 10 | int op = (encoded_op >> 28) & 7; | |
| 11 | int cmp = (encoded_op >> 24) & 15; | |
| 12 | int oparg = (encoded_op << 8) >> 20; | |
| 13 | int cmparg = (encoded_op << 20) >> 20; | |
| d02765d1 GS |
14 | int oldval, ret; |
| 15 | ||
| 3363fbdd MS |
16 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
| 17 | oparg = 1 << oparg; | |
| 18 | ||
| 8d7718aa | 19 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
| 3363fbdd MS |
20 | return -EFAULT; |
| 21 | ||
| d8ad075e | 22 | pagefault_disable(); |
| d02765d1 | 23 | ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval); |
| d8ad075e | 24 | pagefault_enable(); |
| 3363fbdd MS |
25 | |
| 26 | if (!ret) { | |
| 27 | switch (cmp) { | |
| 28 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
| 29 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
| 30 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
| 31 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
| 32 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
| 33 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
| 34 | default: ret = -ENOSYS; | |
| 35 | } | |
| 36 | } | |
| 37 | return ret; | |
| 38 | } | |
| 39 | ||
| 8d7718aa ML |
40 | static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
| 41 | u32 oldval, u32 newval) | |
| 3363fbdd | 42 | { |
| 8d7718aa | 43 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
| 3363fbdd | 44 | return -EFAULT; |
| d02765d1 | 45 | |
| 37a9d912 | 46 | return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval); |
| 3363fbdd MS |
47 | } |
| 48 | ||
| 3363fbdd | 49 | #endif /* _ASM_S390_FUTEX_H */ |