| Mikael Pettersson | e4f2dfb | 2013-03-08 15:03:53 +0100 | [diff] [blame] | 1 | #ifndef _ASM_M68K_FUTEX_H |
| 2 | #define _ASM_M68K_FUTEX_H |
| 3 | |
| 4 | #ifdef __KERNEL__ |
| 5 | #if !defined(CONFIG_MMU) |
| 6 | #include <asm-generic/futex.h> |
| 7 | #else /* CONFIG_MMU */ |
| 8 | |
| 9 | #include <linux/futex.h> |
| 10 | #include <linux/uaccess.h> |
| 11 | #include <asm/errno.h> |
| 12 | |
| 13 | static inline int |
| 14 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
| 15 | u32 oldval, u32 newval) |
| 16 | { |
| 17 | u32 val; |
| 18 | |
| 19 | if (unlikely(get_user(val, uaddr) != 0)) |
| 20 | return -EFAULT; |
| 21 | |
| 22 | if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) |
| 23 | return -EFAULT; |
| 24 | |
| 25 | *uval = val; |
| 26 | |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | static inline int |
| 31 | futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) |
| 32 | { |
| 33 | int op = (encoded_op >> 28) & 7; |
| 34 | int cmp = (encoded_op >> 24) & 15; |
| 35 | int oparg = (encoded_op << 8) >> 20; |
| 36 | int cmparg = (encoded_op << 20) >> 20; |
| 37 | int oldval, ret; |
| 38 | u32 tmp; |
| 39 | |
| 40 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
| 41 | oparg = 1 << oparg; |
| 42 | |
| 43 | pagefault_disable(); /* implies preempt_disable() */ |
| 44 | |
| 45 | ret = -EFAULT; |
| 46 | if (unlikely(get_user(oldval, uaddr) != 0)) |
| 47 | goto out_pagefault_enable; |
| 48 | |
| 49 | ret = 0; |
| 50 | tmp = oldval; |
| 51 | |
| 52 | switch (op) { |
| 53 | case FUTEX_OP_SET: |
| 54 | tmp = oparg; |
| 55 | break; |
| 56 | case FUTEX_OP_ADD: |
| 57 | tmp += oparg; |
| 58 | break; |
| 59 | case FUTEX_OP_OR: |
| 60 | tmp |= oparg; |
| 61 | break; |
| 62 | case FUTEX_OP_ANDN: |
| 63 | tmp &= ~oparg; |
| 64 | break; |
| 65 | case FUTEX_OP_XOR: |
| 66 | tmp ^= oparg; |
| 67 | break; |
| 68 | default: |
| 69 | ret = -ENOSYS; |
| 70 | } |
| 71 | |
| 72 | if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0)) |
| 73 | ret = -EFAULT; |
| 74 | |
| 75 | out_pagefault_enable: |
| 76 | pagefault_enable(); /* subsumes preempt_enable() */ |
| 77 | |
| 78 | if (ret == 0) { |
| 79 | switch (cmp) { |
| 80 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; |
| 81 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; |
| 82 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; |
| 83 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; |
| 84 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; |
| 85 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; |
| 86 | default: ret = -ENOSYS; |
| 87 | } |
| 88 | } |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | #endif /* CONFIG_MMU */ |
| 93 | #endif /* __KERNEL__ */ |
| 94 | #endif /* _ASM_M68K_FUTEX_H */ |