186d131a0SDavid Schultz /*- 2*4d846d26SWarner Losh * SPDX-License-Identifier: BSD-2-Clause 3d915a14eSPedro F. Giffuni * 486d131a0SDavid Schultz * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org> 586d131a0SDavid Schultz * All rights reserved. 686d131a0SDavid Schultz * 786d131a0SDavid Schultz * Redistribution and use in source and binary forms, with or without 886d131a0SDavid Schultz * modification, are permitted provided that the following conditions 986d131a0SDavid Schultz * are met: 1086d131a0SDavid Schultz * 1. Redistributions of source code must retain the above copyright 1186d131a0SDavid Schultz * notice, this list of conditions and the following disclaimer. 1286d131a0SDavid Schultz * 2. Redistributions in binary form must reproduce the above copyright 1386d131a0SDavid Schultz * notice, this list of conditions and the following disclaimer in the 1486d131a0SDavid Schultz * documentation and/or other materials provided with the distribution. 1586d131a0SDavid Schultz * 1686d131a0SDavid Schultz * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1786d131a0SDavid Schultz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1886d131a0SDavid Schultz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1986d131a0SDavid Schultz * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2086d131a0SDavid Schultz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2186d131a0SDavid Schultz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2286d131a0SDavid Schultz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2386d131a0SDavid Schultz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2486d131a0SDavid Schultz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2586d131a0SDavid Schultz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2686d131a0SDavid Schultz * SUCH DAMAGE. 2786d131a0SDavid Schultz */ 2886d131a0SDavid Schultz 2986d131a0SDavid Schultz #include <sys/cdefs.h> 3086d131a0SDavid Schultz __FBSDID("$FreeBSD$"); 3186d131a0SDavid Schultz 3286d131a0SDavid Schultz #include <fenv.h> 3386d131a0SDavid Schultz #include <float.h> 3486d131a0SDavid Schultz 35cc0c9bbaSAndrew Turner #ifndef __ARM_PCS_VFP 367082a2cfSDavid Schultz #include "softfloat-for-gcc.h" 377082a2cfSDavid Schultz #include "milieu.h" 3886d131a0SDavid Schultz #include "softfloat.h" 39cc0c9bbaSAndrew Turner #endif 4086d131a0SDavid Schultz 4186d131a0SDavid Schultz int 4286d131a0SDavid Schultz __flt_rounds(void) 4386d131a0SDavid Schultz { 44cc0c9bbaSAndrew Turner int mode; 4586d131a0SDavid Schultz 46cc0c9bbaSAndrew Turner #ifndef __ARM_PCS_VFP 4786d131a0SDavid Schultz /* 4886d131a0SDavid Schultz * Translate our rounding modes to the unnamed 4986d131a0SDavid Schultz * manifest constants required by C99 et. al. 5086d131a0SDavid Schultz */ 51cc0c9bbaSAndrew Turner mode = __softfloat_float_rounding_mode; 52cc0c9bbaSAndrew Turner #else /* __ARM_PCS_VFP */ 53cc0c9bbaSAndrew Turner /* 54cc0c9bbaSAndrew Turner * Read the floating-point status and control register 55cc0c9bbaSAndrew Turner */ 56cc0c9bbaSAndrew Turner __asm __volatile("vmrs %0, fpscr" : "=&r"(mode)); 57cc0c9bbaSAndrew Turner mode &= _ROUND_MASK; 58cc0c9bbaSAndrew Turner #endif /* __ARM_PCS_VFP */ 59cc0c9bbaSAndrew Turner 60cc0c9bbaSAndrew Turner switch (mode) { 6186d131a0SDavid Schultz case FE_TOWARDZERO: 6286d131a0SDavid Schultz return (0); 6386d131a0SDavid Schultz case FE_TONEAREST: 6486d131a0SDavid Schultz return (1); 6586d131a0SDavid Schultz case FE_UPWARD: 6686d131a0SDavid Schultz return (2); 6786d131a0SDavid Schultz case FE_DOWNWARD: 6886d131a0SDavid Schultz return (3); 6986d131a0SDavid Schultz } 7086d131a0SDavid Schultz return (-1); 7186d131a0SDavid Schultz } 72