1 #ifndef _ASM_PARISC_FUTEX_H 2 #define _ASM_PARISC_FUTEX_H 3 4 #ifdef __KERNEL__ 5 6 #include <linux/futex.h> 7 #include <linux/uaccess.h> 8 #include <asm/errno.h> 9 10 static inline int 11 futex_atomic_op_inuser (int encoded_op, u32 __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(u32))) 22 return -EFAULT; 23 24 pagefault_disable(); 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 pagefault_enable(); 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 54 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 55 u32 oldval, u32 newval) 56 { 57 u32 val; 58 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 65 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) 66 return -EFAULT; 67 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; 74 } 75 76 #endif /*__KERNEL__*/ 77 #endif /*_ASM_PARISC_FUTEX_H*/ 78