1/* 2 * Copyright (C) 1997-2022 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 25#include "sfp-machine.h" 26 27#define HUGE_VAL (__builtin_huge_val ()) 28 29/* Please see section 10, 30 page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */ 31 32void 33__sfp_handle_exceptions (int _fex) 34{ 35 /* Raise exceptions represented by _FEX. But we must raise only one 36 signal at a time. It is important that if the overflow/underflow 37 exception and the divide by zero exception are given at the same 38 time, the overflow/underflow exception follows the divide by zero 39 exception. */ 40 41 /* We do these bits in assembly to be certain GCC doesn't optimize 42 away something important, and so we can force delayed traps to 43 occur. */ 44 45 /* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */ 46 47 /* First: Invalid exception. */ 48 if (_fex & FP_EX_INVALID) 49 { 50 /* One example of an invalid operation is 0 * Infinity. */ 51 double d = HUGE_VAL; 52 __asm__ __volatile__ ( 53 " fcpy,dbl %%fr0,%%fr22\n" 54 " fmpy,dbl %0,%%fr22,%0\n" 55 " fldd 0(%%sr0,%%sp),%0" 56 : "+f" (d) : : "%fr22" ); 57 } 58 59 /* Second: Division by zero. */ 60 if (_fex & FP_EX_DIVZERO) 61 { 62 double d = 1.0; 63 __asm__ __volatile__ ( 64 " fcpy,dbl %%fr0,%%fr22\n" 65 " fdiv,dbl %0,%%fr22,%0\n" 66 " fldd 0(%%sr0,%%sp),%0" 67 : "+f" (d) : : "%fr22" ); 68 } 69 70 /* Third: Overflow. */ 71 if (_fex & FP_EX_OVERFLOW) 72 { 73 double d = __DBL_MAX__; 74 __asm__ __volatile__ ( 75 " fadd,dbl %0,%0,%0\n" 76 " fldd 0(%%sr0,%%sp),%0" 77 : "+f" (d) ); 78 } 79 80 /* Fourth: Underflow. */ 81 if (_fex & FP_EX_UNDERFLOW) 82 { 83 double d = __DBL_MIN__; 84 double e = 3.0; 85 __asm__ __volatile__ ( 86 " fdiv,dbl %0,%1,%0\n" 87 " fldd 0(%%sr0,%%sp),%0" 88 : "+f" (d) : "f" (e) ); 89 } 90 91 /* Fifth: Inexact */ 92 if (_fex & FP_EX_INEXACT) 93 { 94 double d = 3.14159265358979323846; 95 double e = 69.69; 96 __asm__ __volatile__ ( 97 " fdiv,dbl %0,%1,%%fr22\n" 98 " fcnvfxt,dbl,sgl %%fr22,%%fr22L\n" 99 " fldd 0(%%sr0,%%sp),%%fr22" 100 : : "f" (d), "f" (e) : "%fr22" ); 101 } 102} 103