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futex.h

#ifndef __ASM_SH_FUTEX_H
#define __ASM_SH_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>

/* XXX: UP variants, fix for SH-4A and SMP.. */
#include <asm/futex-irq.h>

static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
{
      int op = (encoded_op >> 28) & 7;
      int cmp = (encoded_op >> 24) & 15;
      int oparg = (encoded_op << 8) >> 20;
      int cmparg = (encoded_op << 20) >> 20;
      int oldval = 0, ret;

      if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
            oparg = 1 << oparg;

      if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
            return -EFAULT;

      pagefault_disable();

      switch (op) {
      case FUTEX_OP_SET:
            ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
            break;
      case FUTEX_OP_ADD:
            ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
            break;
      case FUTEX_OP_OR:
            ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
            break;
      case FUTEX_OP_ANDN:
            ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
            break;
      case FUTEX_OP_XOR:
            ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
            break;
      default:
            ret = -ENOSYS;
            break;
      }

      pagefault_enable();

      if (!ret) {
            switch (cmp) {
            case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
            case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
            case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
            case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
            case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
            case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
            default: ret = -ENOSYS;
            }
      }

      return ret;
}

static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
      if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
            return -EFAULT;

      return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval);
}

#endif /* __KERNEL__ */
#endif /* __ASM_SH_FUTEX_H */

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