Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 1 | #ifndef _ASM_PARISC_FUTEX_H |
| 2 | #define _ASM_PARISC_FUTEX_H |
Jakub Jelinek | 4732efbe | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 3 | |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 4 | #ifdef __KERNEL__ |
Jakub Jelinek | 4732efbe | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 5 | |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 6 | #include <linux/futex.h> |
Jeff Dike | 730f412 | 2008-04-30 00:54:49 -0700 | [diff] [blame] | 7 | #include <linux/uaccess.h> |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 8 | #include <asm/errno.h> |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 9 | |
| 10 | static inline int |
Michel Lespinasse | 8d7718a | 2011-03-10 18:50:58 -0800 | [diff] [blame] | 11 | futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 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 | |
Michel Lespinasse | 8d7718a | 2011-03-10 18:50:58 -0800 | [diff] [blame] | 21 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 22 | return -EFAULT; |
| 23 | |
Peter Zijlstra | a866374 | 2006-12-06 20:32:20 -0800 | [diff] [blame] | 24 | pagefault_disable(); |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 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 | |
Peter Zijlstra | a866374 | 2006-12-06 20:32:20 -0800 | [diff] [blame] | 36 | pagefault_enable(); |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 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 |
Michel Lespinasse | 8d7718a | 2011-03-10 18:50:58 -0800 | [diff] [blame] | 54 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
| 55 | u32 oldval, u32 newval) |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 56 | { |
Michel Lespinasse | 8d7718a | 2011-03-10 18:50:58 -0800 | [diff] [blame] | 57 | u32 val; |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 58 | |
Kyle McMartin | c20a84c | 2008-03-01 10:25:52 -0800 | [diff] [blame] | 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 | |
Michel Lespinasse | 8d7718a | 2011-03-10 18:50:58 -0800 | [diff] [blame] | 65 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 66 | return -EFAULT; |
| 67 | |
Michel Lespinasse | 37a9d91 | 2011-03-10 18:48:51 -0800 | [diff] [blame] | 68 | if (get_user(val, uaddr)) |
| 69 | return -EFAULT; |
| 70 | if (val == oldval && put_user(newval, uaddr)) |
| 71 | return -EFAULT; |
| 72 | *uval = val; |
| 73 | return 0; |
Carlos O'Donell | 342a049 | 2006-09-07 13:05:17 -0400 | [diff] [blame] | 74 | } |
| 75 | |
Kyle McMartin | c20a84c | 2008-03-01 10:25:52 -0800 | [diff] [blame] | 76 | #endif /*__KERNEL__*/ |
| 77 | #endif /*_ASM_PARISC_FUTEX_H*/ |