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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_FUTEX_LLSC_H
   3 #define __ASM_SH_FUTEX_LLSC_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                 "synco\n"
  12                 "1:\n\t"
  13                 "movli.l        @%2, r0\n\t"
  14                 "mov    r0, %1\n\t"
  15                 "cmp/eq %1, %4\n\t"
  16                 "bf     2f\n\t"
  17                 "mov    %5, r0\n\t"
  18                 "movco.l        r0, @%2\n\t"
  19                 "bf     1b\n"
  20                 "2:\n\t"
  21                 "synco\n\t"
  22 #ifdef CONFIG_MMU
  23                 ".section       .fixup,\"ax\"\n"
  24                 "3:\n\t"
  25                 "mov.l  4f, %0\n\t"
  26                 "jmp    @%0\n\t"
  27                 " mov   %3, %0\n\t"
  28                 ".balign        4\n"
  29                 "4:     .long   2b\n\t"
  30                 ".previous\n"
  31                 ".section       __ex_table,\"a\"\n\t"
  32                 ".long  1b, 3b\n\t"
  33                 ".previous"
  34 #endif
  35                 :"+r" (err), "=&r" (*uval)
  36                 :"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)
  37                 :"t", "memory", "r0");
  38         if (err) return err;
  39         return 0;
  40 }
  41
  42 #endif /* __ASM_SH_FUTEX_LLSC_H */