1 #ifndef _ASM_GENERIC_FUTEX_H 2 #define _ASM_GENERIC_FUTEX_H 3 4 #include <linux/futex.h> 5 #include <linux/uaccess.h> 6 #include <asm/errno.h> 7 8 static inline int 9 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) 10 { 11 int op = (encoded_op >> 28) & 7; 12 int cmp = (encoded_op >> 24) & 15; 13 int oparg = (encoded_op << 8) >> 20; 14 int cmparg = (encoded_op << 20) >> 20; 15 int oldval = 0, ret; 16 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 17 oparg = 1 << oparg; 18 19 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32))) 20 return -EFAULT; 21 22 pagefault_disable(); 23 24 switch (op) { 25 case FUTEX_OP_SET: 26 case FUTEX_OP_ADD: 27 case FUTEX_OP_OR: 28 case FUTEX_OP_ANDN: 29 case FUTEX_OP_XOR: 30 default: 31 ret = -ENOSYS; 32 } 33 34 pagefault_enable(); 35 36 if (!ret) { 37 switch (cmp) { 38 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 39 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 40 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 41 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 42 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 43 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 44 default: ret = -ENOSYS; 45 } 46 } 47 return ret; 48 } 49 50 static inline int 51 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 52 u32 oldval, u32 newval) 53 { 54 return -ENOSYS; 55 } 56 57 #endif 58