LXR linux/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
   5static 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 */
  43