3b05ffaf6f
With SOFTFLOAT, libc and libm were built correctly, but any program including fenv.h itself assumed it was on a hardfloat systen and emitted inline fpu instructions for fedisableexcept() and friends. Unlike r315424 which did this for MIPS, I've used riscv_float_abi_soft and riscv_float_abi_double macros as appropriate rather than using __riscv_float_abi_soft exclusively. This ensures that attempts to use an unsupported hardfloat ABI will fail. Reviewed by: br Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D10039
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*-
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* Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Portions of this software were developed by the University of Cambridge
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* Computer Laboratory as part of the CTSRD Project, with support from the
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* UK Higher Education Innovation Fund (HEIF).
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <fenv.h>
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#include <float.h>
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#ifdef __riscv_float_abi_soft
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#include "softfloat-for-gcc.h"
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#include "milieu.h"
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#include "softfloat.h"
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#endif
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int
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__flt_rounds(void)
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{
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uint64_t mode;
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#ifdef __riscv_float_abi_soft
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mode = __softfloat_float_rounding_mode;
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#else
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__asm __volatile("csrr %0, fcsr" : "=r" (mode));
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#endif
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switch (mode & _ROUND_MASK) {
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case FE_TOWARDZERO:
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return (0);
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case FE_TONEAREST:
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return (1);
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case FE_UPWARD:
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return (2);
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case FE_DOWNWARD:
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return (3);
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}
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return (-1);
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}
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