1 /*- 2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.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 * $FreeBSD$ 27 */ 28 29 #ifndef _FENV_H_ 30 #define _FENV_H_ 31 32 #include <sys/_types.h> 33 34 #ifdef __cplusplus 35 extern "C" { 36 #endif 37 38 typedef __uint64_t fenv_t; 39 typedef __uint64_t fexcept_t; 40 41 /* 42 * We can't tell if we're using compiler-rt or libgcc; instead 43 * we assume a connection between the compiler in use and 44 * the runtime library. 45 */ 46 #if defined(__clang__) 47 48 /* compiler-rt has no exceptions in soft-float */ 49 50 #define PICOLIBC_LONG_DOUBLE_NOROUND 51 #define PICOLIBC_LONG_DOUBLE_NOEXCEPT 52 53 #if (__ARM_FP & 0x8) == 0 54 #define PICOLIBC_DOUBLE_NOROUND 55 #define PICOLIBC_DOUBLE_NOEXCEPT 56 #endif 57 58 #if (__ARM_FP & 0x4) == 0 59 #define PICOLIBC_FLOAT_NOROUND 60 #define PICOLIBC_FLOAT_NOEXCEPT 61 #endif 62 63 #else 64 65 /* libgcc has exceptions when there is an FPU */ 66 67 #if __ARM_FP == 0 68 #define PICOLIBC_LONG_DOUBLE_NOROUND 69 #define PICOLIBC_LONG_DOUBLE_NOEXCEPT 70 #define PICOLIBC_DOUBLE_NOROUND 71 #define PICOLIBC_DOUBLE_NOEXCEPT 72 #define PICOLIBC_FLOAT_NOROUND 73 #define PICOLIBC_FLOAT_NOEXCEPT 74 #endif 75 76 #endif 77 78 #if __ARM_FP 79 80 /* Exception flags */ 81 #define FE_INVALID 0x00000001 82 #define FE_DIVBYZERO 0x00000002 83 #define FE_OVERFLOW 0x00000004 84 #define FE_UNDERFLOW 0x00000008 85 #define FE_INEXACT 0x00000010 86 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 87 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 88 89 /* 90 * Rounding modes 91 * 92 * We can't just use the hardware bit values here, because that would 93 * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed. 94 */ 95 #define FE_TONEAREST 0x0 96 #define FE_UPWARD 0x1 97 #define FE_DOWNWARD 0x2 98 #define FE_TOWARDZERO 0x3 99 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 100 FE_UPWARD | FE_TOWARDZERO) 101 #define _ROUND_SHIFT 22 102 103 /* We need to be able to map status flag positions to mask flag positions */ 104 #define _FPUSW_SHIFT 8 105 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT) 106 107 #define __mrs_fpcr(__r) __asm __volatile("mrs %0, fpcr" : "=r" (__r)) 108 #define __msr_fpcr(__r) __asm __volatile("msr fpcr, %0" : : "r" (__r)) 109 110 #define __mrs_fpsr(__r) __asm __volatile("mrs %0, fpsr" : "=r" (__r)) 111 #define __msr_fpsr(__r) __asm __volatile("msr fpsr, %0" : : "r" (__r)) 112 113 #else 114 #define FE_TONEAREST 0x00000000 115 #endif 116 117 #if !defined(__declare_fenv_inline) && defined(__declare_extern_inline) 118 #define __declare_fenv_inline(type) __declare_extern_inline(type) 119 #endif 120 121 #ifdef __declare_fenv_inline 122 #if __ARM_FP 123 #include <machine/fenv-fp.h> 124 #else 125 #include <machine/fenv-softfloat.h> 126 #endif 127 128 #endif 129 130 #ifdef __cplusplus 131 } 132 #endif 133 134 #endif /* !_FENV_H_ */ 135
