4f89addcc1
Do not define variables that are not used in Minix builds Change-Id: I11d12e5e1de9fc359b71a7e7534fc8f09fac837d
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: arm_initfini.c,v 1.7 2013/09/08 13:15:53 matt Exp $");
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#include "namespace.h"
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/*
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* To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be
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* aware of whether there is a FPU is present or not. Regardless of whether
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* the hard-float ABI is being used, setjmp needs to save D8-D15. But it can
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* only do this if those instructions won't cause an exception.
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <stdbool.h>
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#include <stddef.h>
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__dso_hidden int _libc_arm_fpu_present;
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#ifndef __ARM_ARCH_EXT_IDIV__
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__dso_hidden int _libc_arm_hwdiv_present;
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#endif
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static bool _libc_aapcs_initialized;
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void _libc_aapcs_init(void) __attribute__((__constructor__, __used__));
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void __section(".text.startup")
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_libc_aapcs_init(void)
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{
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if (!_libc_aapcs_initialized) {
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#if !defined(__minix)
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size_t len = sizeof(_libc_arm_fpu_present);
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#endif
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_libc_aapcs_initialized = true;
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#if !defined(__minix)
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(void)sysctlbyname("machdep.fpu_present",
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&_libc_arm_fpu_present, &len, NULL, 0);
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#ifndef __ARM_ARCH_EXT_IDIV__
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(void)sysctlbyname("machdep.hwdiv_present",
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&_libc_arm_hwdiv_present, &len, NULL, 0);
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#endif
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#endif /* !defined(__minix) */
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}
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}
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