diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/sh/include/asm/futex-llsc.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/sh/include/asm/futex-llsc.h b/arch/sh/include/asm/futex-llsc.h new file mode 100644 index 0000000000..6e1570752b --- /dev/null +++ b/arch/sh/include/asm/futex-llsc.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_FUTEX_LLSC_H +#define __ASM_SH_FUTEX_LLSC_H + +static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval, + u32 __user *uaddr, + u32 oldval, u32 newval) +{ + int err = 0; + __asm__ __volatile__( + "synco\n" + "1:\n\t" + "movli.l @%2, r0\n\t" + "mov r0, %1\n\t" + "cmp/eq %1, %4\n\t" + "bf 2f\n\t" + "mov %5, r0\n\t" + "movco.l r0, @%2\n\t" + "bf 1b\n" + "2:\n\t" + "synco\n\t" +#ifdef CONFIG_MMU + ".section .fixup,\"ax\"\n" + "3:\n\t" + "mov.l 4f, %0\n\t" + "jmp @%0\n\t" + " mov %3, %0\n\t" + ".balign 4\n" + "4: .long 2b\n\t" + ".previous\n" + ".section __ex_table,\"a\"\n\t" + ".long 1b, 3b\n\t" + ".previous" +#endif + :"+r" (err), "=&r" (*uval) + :"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval) + :"t", "memory", "r0"); + if (err) return err; + return 0; +} + +#endif /* __ASM_SH_FUTEX_LLSC_H */ |