1 /* 2 * Copyright (C) 2012-2018 Free Software Foundation, Inc. 3 * 4 * This file is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 3, or (at your option) any 7 * later version. 8 * 9 * This file is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * Under Section 7 of GPL version 3, you are granted additional 15 * permissions described in the GCC Runtime Library Exception, version 16 * 3.1, as published by the Free Software Foundation. 17 * 18 * You should have received a copy of the GNU General Public License and 19 * a copy of the GCC Runtime Library Exception along with this program; 20 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 21 * <http://www.gnu.org/licenses/>. 22 */ 23 24 #ifndef _SOFT_FLOAT 25 #include "sfp-machine.h" 26 27 struct fenv 28 { 29 unsigned short int __control_word; 30 unsigned short int __unused1; 31 unsigned short int __status_word; 32 unsigned short int __unused2; 33 unsigned short int __tags; 34 unsigned short int __unused3; 35 unsigned int __eip; 36 unsigned short int __cs_selector; 37 unsigned int __opcode:11; 38 unsigned int __unused4:5; 39 unsigned int __data_offset; 40 unsigned short int __data_selector; 41 unsigned short int __unused5; 42 }; 43 44 void 45 __sfp_handle_exceptions (int _fex) 46 { 47 if (_fex & FP_EX_INVALID) 48 { 49 float f = 0.0f; 50 #ifdef __SSE_MATH__ 51 volatile float r __attribute__ ((unused)); 52 asm volatile ("%vdivss\t{%0, %d0|%d0, %0}" : "+x" (f)); 53 r = f; /* Needed to trigger exception. */ 54 #else 55 asm volatile ("fdiv\t{%y0, %0|%0, %y0}" : "+t" (f)); 56 /* No need for fwait, exception is triggered by emitted fstp. */ 57 #endif 58 } 59 if (_fex & FP_EX_DENORM) 60 { 61 struct fenv temp; 62 asm volatile ("fnstenv\t%0" : "=m" (temp)); 63 temp.__status_word |= FP_EX_DENORM; 64 asm volatile ("fldenv\t%0" : : "m" (temp)); 65 asm volatile ("fwait"); 66 } 67 if (_fex & FP_EX_DIVZERO) 68 { 69 float f = 1.0f, g = 0.0f; 70 #ifdef __SSE_MATH__ 71 volatile float r __attribute__ ((unused)); 72 asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g)); 73 r = f; /* Needed to trigger exception. */ 74 #else 75 asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g)); 76 /* No need for fwait, exception is triggered by emitted fstp. */ 77 #endif 78 } 79 if (_fex & FP_EX_OVERFLOW) 80 { 81 struct fenv temp; 82 asm volatile ("fnstenv\t%0" : "=m" (temp)); 83 temp.__status_word |= FP_EX_OVERFLOW; 84 asm volatile ("fldenv\t%0" : : "m" (temp)); 85 asm volatile ("fwait"); 86 } 87 if (_fex & FP_EX_UNDERFLOW) 88 { 89 struct fenv temp; 90 asm volatile ("fnstenv\t%0" : "=m" (temp)); 91 temp.__status_word |= FP_EX_UNDERFLOW; 92 asm volatile ("fldenv\t%0" : : "m" (temp)); 93 asm volatile ("fwait"); 94 } 95 if (_fex & FP_EX_INEXACT) 96 { 97 float f = 1.0f, g = 3.0f; 98 #ifdef __SSE_MATH__ 99 volatile float r __attribute__ ((unused)); 100 asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g)); 101 r = f; /* Needed to trigger exception. */ 102 #else 103 asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g)); 104 /* No need for fwait, exception is triggered by emitted fstp. */ 105 #endif 106 } 107 }; 108 #endif 109