Blame sysdeps/sparc/sparc64/pthread_spin_lock.S

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/* Copyright (C) 2012-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <sysdep.h>
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	.text
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ENTRY(pthread_spin_lock)
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1:	ldstub		[%o0], %g1
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	brnz,pn		%g1, 2f
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	 membar		#StoreLoad | #StoreStore
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	retl
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	 mov		0, %o0
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2:	ldub		[%o0], %g1
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	brnz,pt		%g1, 2b
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	 membar		#LoadLoad
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	ba,a,pt		%xcc, 1b
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END(pthread_spin_lock)