release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <asm/futex-irq.h>
  11
  12 static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
  13 {
  14         int op = (encoded_op >> 28) & 7;
  15         int cmp = (encoded_op >> 24) & 15;
  16         int oparg = (encoded_op << 8) >> 20;
  17         int cmparg = (encoded_op << 20) >> 20;
  18         int oldval = 0, ret;
  19
  20         if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  21                 oparg = 1 << oparg;
  22
  23         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
  24                 return -EFAULT;
  25
  26         pagefault_disable();
  27
  28         switch (op) {
  29         case FUTEX_OP_SET:
  30                 ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
  31                 break;
  32         case FUTEX_OP_ADD:
  33                 ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
  34                 break;
  35         case FUTEX_OP_OR:
  36                 ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
  37                 break;
  38         case FUTEX_OP_ANDN:
  39                 ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
  40                 break;
  41         case FUTEX_OP_XOR:
  42                 ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
  43                 break;
  44         default:
  45                 ret = -ENOSYS;
  46                 break;
  47         }
  48
  49         pagefault_enable();
  50
  51         if (!ret) {
  52                 switch (cmp) {
  53                 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
  54                 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
  55                 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
  56                 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
  57                 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
  58                 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
  59                 default: ret = -ENOSYS;
  60                 }
  61         }
  62
  63         return ret;
  64 }
  65
  66 static inline int
  67 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
  68 {
  69         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
  70                 return -EFAULT;
  71
  72         return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval);
  73 }
  74
  75 #endif /* __KERNEL__ */
  76 #endif /* __ASM_SH_FUTEX_H */