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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/futex-llsc.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_FUTEX_LLSC_H

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#define __ASM_SH_FUTEX_LLSC_H

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static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,

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						   u32 __user *uaddr,

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						   u32 oldval, u32 newval)

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{

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	int err = 0;

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	__asm__ __volatile__(

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		"synco\n"

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		"1:\n\t"

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		"movli.l	@%2, r0\n\t"

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		"mov	r0, %1\n\t"

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		"cmp/eq	%1, %4\n\t"

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		"bf	2f\n\t"

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		"mov	%5, r0\n\t"

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		"movco.l	r0, @%2\n\t"

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		"bf	1b\n"

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		"2:\n\t"

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		"synco\n\t"

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#ifdef CONFIG_MMU

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		".section	.fixup,\"ax\"\n"

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		"3:\n\t"

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		"mov.l	4f, %0\n\t"

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		"jmp	@%0\n\t"

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		" mov	%3, %0\n\t"

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		".balign	4\n"

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		"4:	.long	2b\n\t"

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		".previous\n"

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		".section	__ex_table,\"a\"\n\t"

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		".long	1b, 3b\n\t"

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		".previous"

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#endif

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		:"+r" (err), "=&r" (*uval)

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		:"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)

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		:"t", "memory", "r0");

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	if (err) return err;

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	return 0;

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}

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#endif /* __ASM_SH_FUTEX_LLSC_H */

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