1 /*
2 * Copyright (C) 2012-2013 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 #include "sfp-machine.h"
25
26 void
__sfp_handle_exceptions(int _fex)27 __sfp_handle_exceptions (int _fex)
28 {
29 const float fp_max = __FLT_MAX__;
30 const float fp_min = __FLT_MIN__;
31 const float fp_1e32 = 1.0e32f;
32 const float fp_zero = 0.0;
33 const float fp_one = 1.0;
34 unsigned fpsr;
35
36 if (_fex & FP_EX_INVALID)
37 {
38 __asm__ __volatile__ ("fdiv\ts0, %s0, %s0"
39 :
40 : "w" (fp_zero)
41 : "s0");
42 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
43 }
44 if (_fex & FP_EX_DIVZERO)
45 {
46 __asm__ __volatile__ ("fdiv\ts0, %s0, %s1"
47 :
48 : "w" (fp_one), "w" (fp_zero)
49 : "s0");
50 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
51 }
52 if (_fex & FP_EX_OVERFLOW)
53 {
54 __asm__ __volatile__ ("fadd\ts0, %s0, %s1"
55 :
56 : "w" (fp_max), "w" (fp_1e32)
57 : "s0");
58 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
59 }
60 if (_fex & FP_EX_UNDERFLOW)
61 {
62 __asm__ __volatile__ ("fmul\ts0, %s0, %s0"
63 :
64 : "w" (fp_min)
65 : "s0");
66 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
67 }
68 if (_fex & FP_EX_INEXACT)
69 {
70 __asm__ __volatile__ ("fsub\ts0, %s0, %s1"
71 :
72 : "w" (fp_max), "w" (fp_one)
73 : "s0");
74 __asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
75 }
76 }
77