1*8e03dd59SAndrew Turner /*- 2*8e03dd59SAndrew Turner * Copyright (c) 2013 The NetBSD Foundation, Inc. 3*8e03dd59SAndrew Turner * Copyright (c) 2013 Andrew Turner 4*8e03dd59SAndrew Turner * All rights reserved. 5*8e03dd59SAndrew Turner * 6*8e03dd59SAndrew Turner * This code is derived from software contributed to The NetBSD Foundation 7*8e03dd59SAndrew Turner * by Matt Thomas of 3am Software Foundry. 8*8e03dd59SAndrew Turner * 9*8e03dd59SAndrew Turner * Redistribution and use in source and binary forms, with or without 10*8e03dd59SAndrew Turner * modification, are permitted provided that the following conditions 11*8e03dd59SAndrew Turner * are met: 12*8e03dd59SAndrew Turner * 1. Redistributions of source code must retain the above copyright 13*8e03dd59SAndrew Turner * notice, this list of conditions and the following disclaimer. 14*8e03dd59SAndrew Turner * 2. Redistributions in binary form must reproduce the above copyright 15*8e03dd59SAndrew Turner * notice, this list of conditions and the following disclaimer in the 16*8e03dd59SAndrew Turner * documentation and/or other materials provided with the distribution. 17*8e03dd59SAndrew Turner * 18*8e03dd59SAndrew Turner * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19*8e03dd59SAndrew Turner * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20*8e03dd59SAndrew Turner * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21*8e03dd59SAndrew Turner * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22*8e03dd59SAndrew Turner * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23*8e03dd59SAndrew Turner * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24*8e03dd59SAndrew Turner * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25*8e03dd59SAndrew Turner * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26*8e03dd59SAndrew Turner * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27*8e03dd59SAndrew Turner * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28*8e03dd59SAndrew Turner * POSSIBILITY OF SUCH DAMAGE. 29*8e03dd59SAndrew Turner * 30*8e03dd59SAndrew Turner * Bases on NetBSD lib/libc/arch/arm/misc/arm_initfini.c 31*8e03dd59SAndrew Turner * $NetBSD: arm_initfini.c,v 1.2 2013/01/31 06:47:55 matt Exp $ 32*8e03dd59SAndrew Turner */ 33*8e03dd59SAndrew Turner 34*8e03dd59SAndrew Turner #include <sys/cdefs.h> 35*8e03dd59SAndrew Turner __FBSDID("$FreeBSD$"); 36*8e03dd59SAndrew Turner 37*8e03dd59SAndrew Turner /* 38*8e03dd59SAndrew Turner * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be 39*8e03dd59SAndrew Turner * aware of whether there is a FPU is present or not. Regardless of whether 40*8e03dd59SAndrew Turner * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can 41*8e03dd59SAndrew Turner * only do this if those instructions won't cause an exception. 42*8e03dd59SAndrew Turner */ 43*8e03dd59SAndrew Turner 44*8e03dd59SAndrew Turner #include <sys/param.h> 45*8e03dd59SAndrew Turner #include <sys/sysctl.h> 46*8e03dd59SAndrew Turner 47*8e03dd59SAndrew Turner #include <stdbool.h> 48*8e03dd59SAndrew Turner #include <stddef.h> 49*8e03dd59SAndrew Turner 50*8e03dd59SAndrew Turner extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 51*8e03dd59SAndrew Turner void *newp, size_t newlen); 52*8e03dd59SAndrew Turner 53*8e03dd59SAndrew Turner int _libc_arm_fpu_present; 54*8e03dd59SAndrew Turner static bool _libc_aapcs_initialized; 55*8e03dd59SAndrew Turner 56*8e03dd59SAndrew Turner void _libc_aapcs_init(void) __attribute__((__constructor__, __used__)); 57*8e03dd59SAndrew Turner 58*8e03dd59SAndrew Turner void 59*8e03dd59SAndrew Turner _libc_aapcs_init(void) 60*8e03dd59SAndrew Turner { 61*8e03dd59SAndrew Turner int mib[2]; 62*8e03dd59SAndrew Turner size_t len; 63*8e03dd59SAndrew Turner 64*8e03dd59SAndrew Turner if (_libc_aapcs_initialized) 65*8e03dd59SAndrew Turner return; 66*8e03dd59SAndrew Turner 67*8e03dd59SAndrew Turner mib[0] = CTL_HW; 68*8e03dd59SAndrew Turner mib[1] = HW_FLOATINGPT; 69*8e03dd59SAndrew Turner 70*8e03dd59SAndrew Turner len = sizeof(_libc_arm_fpu_present); 71*8e03dd59SAndrew Turner if (__sysctl(mib, 2, &_libc_arm_fpu_present, &len, NULL, 0) == -1 || 72*8e03dd59SAndrew Turner len != sizeof(_libc_arm_fpu_present)) { 73*8e03dd59SAndrew Turner /* sysctl failed, assume no vfp */ 74*8e03dd59SAndrew Turner _libc_arm_fpu_present = 0; 75*8e03dd59SAndrew Turner } 76*8e03dd59SAndrew Turner 77*8e03dd59SAndrew Turner _libc_aapcs_initialized = true; 78*8e03dd59SAndrew Turner } 79