err.no Git - linux-2.6/blob - include/asm-sh/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 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
  67 static inline int
  68 futex_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 */