00b73d8d1b
The version of futex.h in asm-generic should really be adapted to do the same thing so that this hideous code does not have to be duplicated per-arch. Signed-off-by: Rich Felker <dalias@libc.org>
35 lines
689 B
C
35 lines
689 B
C
#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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