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35 lines
728 B
35 lines
728 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_SH_FUTEX_CAS_H |
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#define __ASM_SH_FUTEX_CAS_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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"1:\n\t" |
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"cas.l %2, %1, @r0\n" |
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"2:\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" (newval) |
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:"r" (oldval), "i" (-EFAULT), "z" (uaddr) |
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:"t", "memory"); |
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if (err) return err; |
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*uval = newval; |
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return 0; |
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} |
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#endif /* __ASM_SH_FUTEX_CAS_H */
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