[thirdparty/linux.git] / arch / sh / include / asm / futex-cas.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_FUTEX_CAS_H
#define __ASM_SH_FUTEX_CAS_H

static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
						   u32 __user *uaddr,
						   u32 oldval, u32 newval)
{
	int err = 0;
	__asm__ __volatile__(
		"1:\n\t"
		"cas.l	%2, %1, @r0\n"
		"2:\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" (newval)
		:"r" (oldval), "i" (-EFAULT), "z" (uaddr)
		:"t", "memory");
	if (err) return err;
	*uval = newval;
	return 0;
}

#endif /* __ASM_SH_FUTEX_CAS_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
00b73d8d RF	2	#ifndef __ASM_SH_FUTEX_CAS_H
	3	#define __ASM_SH_FUTEX_CAS_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	"1:\n\t"
	12	"cas.l %2, %1, @r0\n"
	13	"2:\n\t"
	14	#ifdef CONFIG_MMU
	15	".section .fixup,\"ax\"\n"
	16	"3:\n\t"
	17	"mov.l 4f, %0\n\t"
	18	"jmp @%0\n\t"
	19	" mov %3, %0\n\t"
	20	".balign 4\n"
	21	"4: .long 2b\n\t"
	22	".previous\n"
	23	".section __ex_table,\"a\"\n\t"
	24	".long 1b, 3b\n\t"
	25	".previous"
	26	#endif
	27	:"+r" (err), "+r" (newval)
	28	:"r" (oldval), "i" (-EFAULT), "z" (uaddr)
	29	:"t", "memory");
	30	if (err) return err;
	31	*uval = newval;
	32	return 0;
	33	}
	34
	35	#endif /* __ASM_SH_FUTEX_CAS_H */