1deae26bfSKyle McMartin #ifndef _ASM_PARISC_FUTEX_H 2deae26bfSKyle McMartin #define _ASM_PARISC_FUTEX_H 3deae26bfSKyle McMartin 4deae26bfSKyle McMartin #ifdef __KERNEL__ 5deae26bfSKyle McMartin 6deae26bfSKyle McMartin #include <linux/futex.h> 7deae26bfSKyle McMartin #include <linux/uaccess.h> 8deae26bfSKyle McMartin #include <asm/errno.h> 9deae26bfSKyle McMartin 10deae26bfSKyle McMartin static inline int 11deae26bfSKyle McMartin futex_atomic_op_inuser (int encoded_op, int __user *uaddr) 12deae26bfSKyle McMartin { 13deae26bfSKyle McMartin int op = (encoded_op >> 28) & 7; 14deae26bfSKyle McMartin int cmp = (encoded_op >> 24) & 15; 15deae26bfSKyle McMartin int oparg = (encoded_op << 8) >> 20; 16deae26bfSKyle McMartin int cmparg = (encoded_op << 20) >> 20; 17deae26bfSKyle McMartin int oldval = 0, ret; 18deae26bfSKyle McMartin if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 19deae26bfSKyle McMartin oparg = 1 << oparg; 20deae26bfSKyle McMartin 21deae26bfSKyle McMartin if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) 22deae26bfSKyle McMartin return -EFAULT; 23deae26bfSKyle McMartin 24deae26bfSKyle McMartin pagefault_disable(); 25deae26bfSKyle McMartin 26deae26bfSKyle McMartin switch (op) { 27deae26bfSKyle McMartin case FUTEX_OP_SET: 28deae26bfSKyle McMartin case FUTEX_OP_ADD: 29deae26bfSKyle McMartin case FUTEX_OP_OR: 30deae26bfSKyle McMartin case FUTEX_OP_ANDN: 31deae26bfSKyle McMartin case FUTEX_OP_XOR: 32deae26bfSKyle McMartin default: 33deae26bfSKyle McMartin ret = -ENOSYS; 34deae26bfSKyle McMartin } 35deae26bfSKyle McMartin 36deae26bfSKyle McMartin pagefault_enable(); 37deae26bfSKyle McMartin 38deae26bfSKyle McMartin if (!ret) { 39deae26bfSKyle McMartin switch (cmp) { 40deae26bfSKyle McMartin case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 41deae26bfSKyle McMartin case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 42deae26bfSKyle McMartin case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 43deae26bfSKyle McMartin case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 44deae26bfSKyle McMartin case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 45deae26bfSKyle McMartin case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 46deae26bfSKyle McMartin default: ret = -ENOSYS; 47deae26bfSKyle McMartin } 48deae26bfSKyle McMartin } 49deae26bfSKyle McMartin return ret; 50deae26bfSKyle McMartin } 51deae26bfSKyle McMartin 52deae26bfSKyle McMartin /* Non-atomic version */ 53deae26bfSKyle McMartin static inline int 54*37a9d912SMichel Lespinasse futex_atomic_cmpxchg_inatomic(int *uval, int __user *uaddr, 55*37a9d912SMichel Lespinasse int oldval, int newval) 56deae26bfSKyle McMartin { 57*37a9d912SMichel Lespinasse int val; 58deae26bfSKyle McMartin 59deae26bfSKyle McMartin /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is 60deae26bfSKyle McMartin * our gateway page, and causes no end of trouble... 61deae26bfSKyle McMartin */ 62deae26bfSKyle McMartin if (segment_eq(KERNEL_DS, get_fs()) && !uaddr) 63deae26bfSKyle McMartin return -EFAULT; 64deae26bfSKyle McMartin 65deae26bfSKyle McMartin if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) 66deae26bfSKyle McMartin return -EFAULT; 67deae26bfSKyle McMartin 68*37a9d912SMichel Lespinasse if (get_user(val, uaddr)) 69*37a9d912SMichel Lespinasse return -EFAULT; 70*37a9d912SMichel Lespinasse if (val == oldval && put_user(newval, uaddr)) 71*37a9d912SMichel Lespinasse return -EFAULT; 72*37a9d912SMichel Lespinasse *uval = val; 73*37a9d912SMichel Lespinasse return 0; 74deae26bfSKyle McMartin } 75deae26bfSKyle McMartin 76deae26bfSKyle McMartin #endif /*__KERNEL__*/ 77deae26bfSKyle McMartin #endif /*_ASM_PARISC_FUTEX_H*/ 78