arch/sh/include/asm/futex-cas.h

   1 #ifndef __ASM_SH_FUTEX_CAS_H
   2 #define __ASM_SH_FUTEX_CAS_H
   3
   4 static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
   5                                                    u32 __user *uaddr,
   6                                                    u32 oldval, u32 newval)
   7 {
   8         int err = 0;
   9         __asm__ __volatile__(
  10                 "1:\n\t"
  11                 "cas.l  %2, %1, @r0\n"
  12                 "2:\n\t"
  13 #ifdef CONFIG_MMU
  14                 ".section       .fixup,\"ax\"\n"
  15                 "3:\n\t"
  16                 "mov.l  4f, %0\n\t"
  17                 "jmp    @%0\n\t"
  18                 " mov   %3, %0\n\t"
  19                 ".balign        4\n"
  20                 "4:     .long   2b\n\t"
  21                 ".previous\n"
  22                 ".section       __ex_table,\"a\"\n\t"
  23                 ".long  1b, 3b\n\t"
  24                 ".previous"
  25 #endif
  26                 :"+r" (err), "+r" (newval)
  27                 :"r" (oldval), "i" (-EFAULT), "z" (uaddr)
  28                 :"t", "memory");
  29         if (err) return err;
  30         *uval = newval;
  31         return 0;
  32 }
  33
  34 #endif /* __ASM_SH_FUTEX_CAS_H */