arch/sh/include/asm/futex.h

   1 #ifndef __ASM_SH_FUTEX_H
   2 #define __ASM_SH_FUTEX_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/futex.h>
   7 #include <linux/uaccess.h>
   8 #include <asm/errno.h>
   9
  10 /* XXX: UP variants, fix for SH-4A and SMP.. */
  11 #include <asm/futex-irq.h>
  12
  13 static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
  14                 u32 __user *uaddr)
  15 {
  16         int oldval = 0, ret;
  17
  18         pagefault_disable();
  19
  20         switch (op) {
  21         case FUTEX_OP_SET:
  22                 ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
  23                 break;
  24         case FUTEX_OP_ADD:
  25                 ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
  26                 break;
  27         case FUTEX_OP_OR:
  28                 ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
  29                 break;
  30         case FUTEX_OP_ANDN:
  31                 ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
  32                 break;
  33         case FUTEX_OP_XOR:
  34                 ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
  35                 break;
  36         default:
  37                 ret = -ENOSYS;
  38                 break;
  39         }
  40
  41         pagefault_enable();
  42
  43         if (!ret)
  44                 *oval = oldval;
  45
  46         return ret;
  47 }
  48
  49 static inline int
  50 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
  51                               u32 oldval, u32 newval)
  52 {
  53         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
  54                 return -EFAULT;
  55
  56         return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
  57 }
  58
  59 #endif /* __KERNEL__ */
  60 #endif /* __ASM_SH_FUTEX_H */