8e03dd5926
Store/restore the VFP registers in setjmp/longjmp on ARM EABI if VFP is enabled in the kernel. It checks the hw.floatingpoint sysctl to see if floating-point is available and uses this to determine if it should store them. If it does it uses a different magic value so longjmp is able to know if it should load them.
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* Copyright (c) 2013 Andrew Turner
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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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* Bases on NetBSD lib/libc/arch/arm/misc/arm_initfini.c
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* $NetBSD: arm_initfini.c,v 1.2 2013/01/31 06:47:55 matt Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
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void *newp, size_t newlen);
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int _libc_arm_fpu_present;
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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
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_libc_aapcs_init(void)
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{
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int mib[2];
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size_t len;
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if (_libc_aapcs_initialized)
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return;
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mib[0] = CTL_HW;
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mib[1] = HW_FLOATINGPT;
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len = sizeof(_libc_arm_fpu_present);
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if (__sysctl(mib, 2, &_libc_arm_fpu_present, &len, NULL, 0) == -1 ||
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len != sizeof(_libc_arm_fpu_present)) {
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/* sysctl failed, assume no vfp */
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_libc_arm_fpu_present = 0;
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}
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_libc_aapcs_initialized = true;
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}
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