18e03dd59SAndrew Turner /*- 2*b61a5730SWarner Losh * SPDX-License-Identifier: BSD-2-Clause 3d915a14eSPedro F. Giffuni * 48e03dd59SAndrew Turner * Copyright (c) 2013 The NetBSD Foundation, Inc. 58e03dd59SAndrew Turner * Copyright (c) 2013 Andrew Turner 68e03dd59SAndrew Turner * All rights reserved. 78e03dd59SAndrew Turner * 88e03dd59SAndrew Turner * This code is derived from software contributed to The NetBSD Foundation 98e03dd59SAndrew Turner * by Matt Thomas of 3am Software Foundry. 108e03dd59SAndrew Turner * 118e03dd59SAndrew Turner * Redistribution and use in source and binary forms, with or without 128e03dd59SAndrew Turner * modification, are permitted provided that the following conditions 138e03dd59SAndrew Turner * are met: 148e03dd59SAndrew Turner * 1. Redistributions of source code must retain the above copyright 158e03dd59SAndrew Turner * notice, this list of conditions and the following disclaimer. 168e03dd59SAndrew Turner * 2. Redistributions in binary form must reproduce the above copyright 178e03dd59SAndrew Turner * notice, this list of conditions and the following disclaimer in the 188e03dd59SAndrew Turner * documentation and/or other materials provided with the distribution. 198e03dd59SAndrew Turner * 208e03dd59SAndrew Turner * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 218e03dd59SAndrew Turner * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 228e03dd59SAndrew Turner * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 238e03dd59SAndrew Turner * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 248e03dd59SAndrew Turner * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 258e03dd59SAndrew Turner * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 268e03dd59SAndrew Turner * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 278e03dd59SAndrew Turner * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 288e03dd59SAndrew Turner * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 298e03dd59SAndrew Turner * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 308e03dd59SAndrew Turner * POSSIBILITY OF SUCH DAMAGE. 318e03dd59SAndrew Turner * 328e03dd59SAndrew Turner * Bases on NetBSD lib/libc/arch/arm/misc/arm_initfini.c 338e03dd59SAndrew Turner * $NetBSD: arm_initfini.c,v 1.2 2013/01/31 06:47:55 matt Exp $ 348e03dd59SAndrew Turner */ 358e03dd59SAndrew Turner 368e03dd59SAndrew Turner #include <sys/cdefs.h> 378e03dd59SAndrew Turner __FBSDID("$FreeBSD$"); 388e03dd59SAndrew Turner 398e03dd59SAndrew Turner /* 408e03dd59SAndrew Turner * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be 418e03dd59SAndrew Turner * aware of whether there is a FPU is present or not. Regardless of whether 428e03dd59SAndrew Turner * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can 438e03dd59SAndrew Turner * only do this if those instructions won't cause an exception. 448e03dd59SAndrew Turner */ 458e03dd59SAndrew Turner 468e03dd59SAndrew Turner #include <sys/param.h> 478e03dd59SAndrew Turner #include <sys/sysctl.h> 488e03dd59SAndrew Turner 498e03dd59SAndrew Turner #include <stdbool.h> 508e03dd59SAndrew Turner #include <stddef.h> 518e03dd59SAndrew Turner 528e03dd59SAndrew Turner extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 538e03dd59SAndrew Turner void *newp, size_t newlen); 548e03dd59SAndrew Turner 558e03dd59SAndrew Turner int _libc_arm_fpu_present; 568e03dd59SAndrew Turner static bool _libc_aapcs_initialized; 578e03dd59SAndrew Turner 588e03dd59SAndrew Turner void _libc_aapcs_init(void) __attribute__((__constructor__, __used__)); 598e03dd59SAndrew Turner 608e03dd59SAndrew Turner void 618e03dd59SAndrew Turner _libc_aapcs_init(void) 628e03dd59SAndrew Turner { 638e03dd59SAndrew Turner int mib[2]; 648e03dd59SAndrew Turner size_t len; 658e03dd59SAndrew Turner 668e03dd59SAndrew Turner if (_libc_aapcs_initialized) 678e03dd59SAndrew Turner return; 688e03dd59SAndrew Turner 698e03dd59SAndrew Turner mib[0] = CTL_HW; 708e03dd59SAndrew Turner mib[1] = HW_FLOATINGPT; 718e03dd59SAndrew Turner 728e03dd59SAndrew Turner len = sizeof(_libc_arm_fpu_present); 738e03dd59SAndrew Turner if (__sysctl(mib, 2, &_libc_arm_fpu_present, &len, NULL, 0) == -1 || 748e03dd59SAndrew Turner len != sizeof(_libc_arm_fpu_present)) { 758e03dd59SAndrew Turner /* sysctl failed, assume no vfp */ 768e03dd59SAndrew Turner _libc_arm_fpu_present = 0; 778e03dd59SAndrew Turner } 788e03dd59SAndrew Turner 798e03dd59SAndrew Turner _libc_aapcs_initialized = true; 808e03dd59SAndrew Turner } 81