Release 4.14 arch/sh/include/asm/futex-llsc.h

/* 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;
}

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#endif /* __ASM_SH_FUTEX_LLSC_H */
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Person
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Greg Kroah-Hartman
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Total
57
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2
100.00%
Directory: arch/sh/include/asm

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