LXR linux/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
  13static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
  14{
  15        int op = (encoded_op >> 28) & 7;
  16        int cmp = (encoded_op >> 24) & 15;
  17        int oparg = (encoded_op << 8) >> 20;
  18        int cmparg = (encoded_op << 20) >> 20;
  19        int oldval = 0, ret;
  20
  21        if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  22                oparg = 1 << oparg;
  23
  24        if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
  25                return -EFAULT;
  26
  27        pagefault_disable();
  28
  29        switch (op) {
  30        case FUTEX_OP_SET:
  31                ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
  32                break;
  33        case FUTEX_OP_ADD:
  34                ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
  35                break;
  36        case FUTEX_OP_OR:
  37                ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
  38                break;
  39        case FUTEX_OP_ANDN:
  40                ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
  41                break;
  42        case FUTEX_OP_XOR:
  43                ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
  44                break;
  45        default:
  46                ret = -ENOSYS;
  47                break;
  48        }
  49
  50        pagefault_enable();
  51
  52        if (!ret) {
  53                switch (cmp) {
  54                case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
  55                case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
  56                case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
  57                case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
  58                case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
  59                case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
  60                default: ret = -ENOSYS;
  61                }
  62        }
  63
  64        return ret;
  65}
  66
  67static inline int
  68futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
  69{
  70        if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
  71                return -EFAULT;
  72
  73        return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval);
  74}
  75
  76#endif /* __KERNEL__ */
  77#endif /* __ASM_SH_FUTEX_H */
  78