1 #ifndef _ASM_S390_FUTEX_H 2 #define _ASM_S390_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 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) 11 { 12 int op = (encoded_op >> 28) & 7; 13 int cmp = (encoded_op >> 24) & 15; 14 int oparg = (encoded_op << 8) >> 20; 15 int cmparg = (encoded_op << 20) >> 20; 16 int oldval, ret; 17 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 ret = uaccess.futex_atomic_op(op, uaddr, oparg, &oldval); 26 pagefault_enable(); 27 28 if (!ret) { 29 switch (cmp) { 30 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 31 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 32 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 33 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 34 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 35 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 36 default: ret = -ENOSYS; 37 } 38 } 39 return ret; 40 } 41 42 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 43 u32 oldval, u32 newval) 44 { 45 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) 46 return -EFAULT; 47 48 return uaccess.futex_atomic_cmpxchg(uval, uaddr, oldval, newval); 49 } 50 51 #endif /* __KERNEL__ */ 52 #endif /* _ASM_S390_FUTEX_H */ 53