text: /*-
   * Copyright (c) 2013 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Matt Thomas of 3am Software Foundry.
   *
   * 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/cdefs.h>
  
  __RCSID("$NetBSD: arm_initfini.c,v 1.7 2013/09/08 13:15:53 matt Exp $");
  
  #include "namespace.h"
  
  /*
   * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be
   * aware of whether there is a FPU is present or not.  Regardless of whether
   * the hard-float ABI is being used, setjmp needs to save D8-D15.  But it can
   * only do this if those instructions won't cause an exception.
   */
  
  #include <sys/param.h>
  #include <sys/sysctl.h>
  
  #include <stdbool.h>
  #include <stddef.h>
  
  __dso_hidden int _libc_arm_fpu_present;
  #ifndef __ARM_ARCH_EXT_IDIV__
  __dso_hidden int _libc_arm_hwdiv_present;
  #endif
  static bool _libc_aapcs_initialized;
  
  void	_libc_aapcs_init(void) __attribute__((__constructor__, __used__));
  
  void __section(".text.startup")
  _libc_aapcs_init(void)
  {
  	if (!_libc_aapcs_initialized) {
  		size_t len = sizeof(_libc_arm_fpu_present);
  		_libc_aapcs_initialized = true;
  		(void)sysctlbyname("machdep.fpu_present",
  		    &_libc_arm_fpu_present, &len, NULL, 0);
  #ifndef __ARM_ARCH_EXT_IDIV__
  		(void)sysctlbyname("machdep.hwdiv_present",
  		    &_libc_arm_hwdiv_present, &len, NULL, 0);
  #endif
  	}
  }
  