1 /*- 2 * Copyright (c) 2013 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Matt Thomas of 3am Software Foundry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __RCSID("$NetBSD: arm_initfini.c,v 1.2 2013/01/31 06:47:55 matt Exp $"); 33 34 /* 35 * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be 36 * aware of whether there is a FPU is present or not. Regardless of whether 37 * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can 38 * only do this if those instructions won't cause an exception. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/sysctl.h> 43 44 #include <stdbool.h> 45 #include <stddef.h> 46 47 int _libc_arm_fpu_present; 48 static bool _libc_aapcs_initialized; 49 50 void _libc_aapcs_init(void) __attribute__((__constructor__, __used__)); 51 52 void 53 _libc_aapcs_init(void) 54 { 55 if (!_libc_aapcs_initialized) { 56 size_t len = sizeof(_libc_arm_fpu_present); 57 _libc_aapcs_initialized = true; 58 (void)sysctlbyname("machdep.fpu_present", 59 &_libc_arm_fpu_present, &len, NULL, 0); 60 } 61 } 62