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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_FUTEX_CAS_H
   3 #define __ASM_SH_FUTEX_CAS_H
   4
   5 static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
   6                                                    u32 __user *uaddr,
   7                                                    u32 oldval, u32 newval)
   8 {
   9         int err = 0;
  10         __asm__ __volatile__(
  11                 "1:\n\t"
  12                 "cas.l  %2, %1, @r0\n"
  13                 "2:\n\t"
  14 #ifdef CONFIG_MMU
  15                 ".section       .fixup,\"ax\"\n"
  16                 "3:\n\t"
  17                 "mov.l  4f, %0\n\t"
  18                 "jmp    @%0\n\t"
  19                 " mov   %3, %0\n\t"
  20                 ".balign        4\n"
  21                 "4:     .long   2b\n\t"
  22                 ".previous\n"
  23                 ".section       __ex_table,\"a\"\n\t"
  24                 ".long  1b, 3b\n\t"
  25                 ".previous"
  26 #endif
  27                 :"+r" (err), "+r" (newval)
  28                 :"r" (oldval), "i" (-EFAULT), "z" (uaddr)
  29                 :"t", "memory");
  30         if (err) return err;
  31         *uval = newval;
  32         return 0;
  33 }
  34
  35 #endif /* __ASM_SH_FUTEX_CAS_H */