| Kaz Kojima | fc1d4c9 | 2007-06-18 13:58:32 +0900 | [diff] [blame] | 1 | #ifndef __ASM_SH_FUTEX_H |
| 2 | #define __ASM_SH_FUTEX_H |
| Jakub Jelinek | 4732efb | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 3 | |
| Kaz Kojima | fc1d4c9 | 2007-06-18 13:58:32 +0900 | [diff] [blame] | 4 | #ifdef __KERNEL__ |
| Jakub Jelinek | 4732efb | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 5 | |
| Kaz Kojima | fc1d4c9 | 2007-06-18 13:58:32 +0900 | [diff] [blame] | 6 | #include <linux/futex.h> |
| Jeff Dike | 730f412 | 2008-04-30 00:54:49 -0700 | [diff] [blame] | 7 | #include <linux/uaccess.h> |
| Kaz Kojima | fc1d4c9 | 2007-06-18 13:58:32 +0900 | [diff] [blame] | 8 | #include <asm/errno.h> |
| Kaz Kojima | fc1d4c9 | 2007-06-18 13:58:32 +0900 | [diff] [blame] | 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 */ |