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Provide assembly _atomic_cas_up() as the compiler cannot be trusted to

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generate fully restartable code sequences.
This commit is contained in:
skrll 2008-08-11 21:54:51 +00:00
parent ad5c6971b7
commit d8054af5f4
2 changed files with 49 additions and 1 deletions
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4
common/lib/libc/arch/hppa/atomic/Makefile.inc
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@ -1,4 +1,4 @@
# $NetBSD: Makefile.inc,v 1.3 2008/02/11 14:21:12 ad Exp $
# $NetBSD: Makefile.inc,v 1.4 2008/08/11 21:54:51 skrll Exp $
.if defined(LIB) && (${LIB} == "kern" || ${LIB} == "c")
@ -12,5 +12,7 @@ SRCS+= atomic_add_32_cas.c atomic_add_32_nv_cas.c atomic_and_32_cas.c \
.if defined(LIB) && (${LIB} == "c")
SRCS+= atomic_init_testset.c
SRCS+= atomic_cas_up.S
CPPFLAGS+= -D__HAVE_ASM_ATOMIC_CAS_UP
.endif

46
common/lib/libc/arch/hppa/atomic/atomic_cas_up.S Normal file
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@ -0,0 +1,46 @@
/* $NetBSD $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/ras.h>
#include <machine/asm.h>
LEAF_ENTRY_NOPROFILE(_atomic_cas_up)
.hidden _C_LABEL(_atomic_cas_up)
RAS_START_ASM_HIDDEN(_atomic_cas)
ldw 0(%arg0), %ret0
comb,<>,n %arg1, %ret0, 1f
stw %arg2, 0(%arg0)
RAS_END_ASM_HIDDEN(_atomic_cas)
1:
bv,n %r0(%rp)
EXIT(_atomic_cas_up)