1 /*- 2 * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <fenv.h> 31 #include <float.h> 32 33 #ifndef __ARM_PCS_VFP 34 #include "softfloat-for-gcc.h" 35 #include "milieu.h" 36 #include "softfloat.h" 37 #endif 38 39 int 40 __flt_rounds(void) 41 { 42 int mode; 43 44 #ifndef __ARM_PCS_VFP 45 /* 46 * Translate our rounding modes to the unnamed 47 * manifest constants required by C99 et. al. 48 */ 49 mode = __softfloat_float_rounding_mode; 50 #else /* __ARM_PCS_VFP */ 51 /* 52 * Read the floating-point status and control register 53 */ 54 __asm __volatile("vmrs %0, fpscr" : "=&r"(mode)); 55 mode &= _ROUND_MASK; 56 #endif /* __ARM_PCS_VFP */ 57 58 switch (mode) { 59 case FE_TOWARDZERO: 60 return (0); 61 case FE_TONEAREST: 62 return (1); 63 case FE_UPWARD: 64 return (2); 65 case FE_DOWNWARD: 66 return (3); 67 } 68 return (-1); 69 } 70