1*deae26bfSKyle McMartin #ifndef _ASM_PARISC_FUTEX_H 2*deae26bfSKyle McMartin #define _ASM_PARISC_FUTEX_H 3*deae26bfSKyle McMartin 4*deae26bfSKyle McMartin #ifdef __KERNEL__ 5*deae26bfSKyle McMartin 6*deae26bfSKyle McMartin #include <linux/futex.h> 7*deae26bfSKyle McMartin #include <linux/uaccess.h> 8*deae26bfSKyle McMartin #include <asm/errno.h> 9*deae26bfSKyle McMartin 10*deae26bfSKyle McMartin static inline int 11*deae26bfSKyle McMartin futex_atomic_op_inuser (int encoded_op, int __user *uaddr) 12*deae26bfSKyle McMartin { 13*deae26bfSKyle McMartin int op = (encoded_op >> 28) & 7; 14*deae26bfSKyle McMartin int cmp = (encoded_op >> 24) & 15; 15*deae26bfSKyle McMartin int oparg = (encoded_op << 8) >> 20; 16*deae26bfSKyle McMartin int cmparg = (encoded_op << 20) >> 20; 17*deae26bfSKyle McMartin int oldval = 0, ret; 18*deae26bfSKyle McMartin if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 19*deae26bfSKyle McMartin oparg = 1 << oparg; 20*deae26bfSKyle McMartin 21*deae26bfSKyle McMartin if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) 22*deae26bfSKyle McMartin return -EFAULT; 23*deae26bfSKyle McMartin 24*deae26bfSKyle McMartin pagefault_disable(); 25*deae26bfSKyle McMartin 26*deae26bfSKyle McMartin switch (op) { 27*deae26bfSKyle McMartin case FUTEX_OP_SET: 28*deae26bfSKyle McMartin case FUTEX_OP_ADD: 29*deae26bfSKyle McMartin case FUTEX_OP_OR: 30*deae26bfSKyle McMartin case FUTEX_OP_ANDN: 31*deae26bfSKyle McMartin case FUTEX_OP_XOR: 32*deae26bfSKyle McMartin default: 33*deae26bfSKyle McMartin ret = -ENOSYS; 34*deae26bfSKyle McMartin } 35*deae26bfSKyle McMartin 36*deae26bfSKyle McMartin pagefault_enable(); 37*deae26bfSKyle McMartin 38*deae26bfSKyle McMartin if (!ret) { 39*deae26bfSKyle McMartin switch (cmp) { 40*deae26bfSKyle McMartin case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 41*deae26bfSKyle McMartin case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 42*deae26bfSKyle McMartin case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 43*deae26bfSKyle McMartin case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 44*deae26bfSKyle McMartin case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 45*deae26bfSKyle McMartin case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 46*deae26bfSKyle McMartin default: ret = -ENOSYS; 47*deae26bfSKyle McMartin } 48*deae26bfSKyle McMartin } 49*deae26bfSKyle McMartin return ret; 50*deae26bfSKyle McMartin } 51*deae26bfSKyle McMartin 52*deae26bfSKyle McMartin /* Non-atomic version */ 53*deae26bfSKyle McMartin static inline int 54*deae26bfSKyle McMartin futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) 55*deae26bfSKyle McMartin { 56*deae26bfSKyle McMartin int err = 0; 57*deae26bfSKyle McMartin int uval; 58*deae26bfSKyle McMartin 59*deae26bfSKyle McMartin /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is 60*deae26bfSKyle McMartin * our gateway page, and causes no end of trouble... 61*deae26bfSKyle McMartin */ 62*deae26bfSKyle McMartin if (segment_eq(KERNEL_DS, get_fs()) && !uaddr) 63*deae26bfSKyle McMartin return -EFAULT; 64*deae26bfSKyle McMartin 65*deae26bfSKyle McMartin if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) 66*deae26bfSKyle McMartin return -EFAULT; 67*deae26bfSKyle McMartin 68*deae26bfSKyle McMartin err = get_user(uval, uaddr); 69*deae26bfSKyle McMartin if (err) return -EFAULT; 70*deae26bfSKyle McMartin if (uval == oldval) 71*deae26bfSKyle McMartin err = put_user(newval, uaddr); 72*deae26bfSKyle McMartin if (err) return -EFAULT; 73*deae26bfSKyle McMartin return uval; 74*deae26bfSKyle McMartin } 75*deae26bfSKyle McMartin 76*deae26bfSKyle McMartin #endif /*__KERNEL__*/ 77*deae26bfSKyle McMartin #endif /*_ASM_PARISC_FUTEX_H*/ 78