projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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; | |
| 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 |