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04277e02 | 1 | /* Copyright (C) 1997-2019 Free Software Foundation, Inc. |
554066b8 MS |
2 | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public License as | |
7 | published by the Free Software Foundation; either version 2.1 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fenv.h> | |
20 | #include <fpu_control.h> | |
21 | #include <float.h> | |
22 | ||
23 | int | |
0747f818 | 24 | __feraiseexcept (int excepts) |
554066b8 MS |
25 | { |
26 | int fpsr; | |
27 | const float fp_zero = 0.0; | |
28 | const float fp_one = 1.0; | |
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_two = 2.0; | |
33 | const float fp_three = 3.0; | |
34 | ||
35 | /* Raise exceptions represented by EXCEPTS. But we must raise only | |
36 | one signal at a time. It is important that if the OVERFLOW or | |
37 | UNDERFLOW exception and the inexact exception are given at the | |
38 | same time, the OVERFLOW or UNDERFLOW exception precedes the | |
39 | INEXACT exception. | |
40 | ||
41 | After each exception we read from the FPSR, to force the | |
42 | exception to be raised immediately. */ | |
43 | ||
44 | if (FE_INVALID & excepts) | |
45 | __asm__ __volatile__ ( | |
46 | "ldr s0, %1\n\t" | |
47 | "fdiv s0, s0, s0\n\t" | |
48 | "mrs %0, fpsr" : "=r" (fpsr) | |
49 | : "m" (fp_zero) | |
50 | : "d0"); | |
51 | ||
52 | if (FE_DIVBYZERO & excepts) | |
53 | __asm__ __volatile__ ( | |
54 | "ldr s0, %1\n\t" | |
55 | "ldr s1, %2\n\t" | |
56 | "fdiv s0, s0, s1\n\t" | |
57 | "mrs %0, fpsr" : "=r" (fpsr) | |
58 | : "m" (fp_one), "m" (fp_zero) | |
59 | : "d0", "d1"); | |
60 | ||
61 | if (FE_OVERFLOW & excepts) | |
62 | /* There's no way to raise overflow without also raising inexact. */ | |
63 | __asm__ __volatile__ ( | |
64 | "ldr s0, %1\n\t" | |
65 | "ldr s1, %2\n\t" | |
66 | "fadd s0, s0, s1\n\t" | |
67 | "mrs %0, fpsr" : "=r" (fpsr) | |
68 | : "m" (fp_max), "m" (fp_1e32) | |
69 | : "d0", "d1"); | |
70 | ||
71 | if (FE_UNDERFLOW & excepts) | |
72 | __asm__ __volatile__ ( | |
73 | "ldr s0, %1\n\t" | |
74 | "ldr s1, %2\n\t" | |
75 | "fdiv s0, s0, s1\n\t" | |
76 | "mrs %0, fpsr" : "=r" (fpsr) | |
77 | : "m" (fp_min), "m" (fp_three) | |
78 | : "d0", "d1"); | |
79 | ||
80 | if (FE_INEXACT & excepts) | |
81 | __asm__ __volatile__ ( | |
82 | "ldr s0, %1\n\t" | |
83 | "ldr s1, %2\n\t" | |
84 | "fdiv s0, s0, s1\n\t" | |
85 | "mrs %0, fpsr" : "=r" (fpsr) | |
86 | : "m" (fp_two), "m" (fp_three) | |
87 | : "d0", "d1"); | |
88 | ||
89 | return 0; | |
90 | } | |
0747f818 JM |
91 | libm_hidden_def (__feraiseexcept) |
92 | weak_alias (__feraiseexcept, feraiseexcept) | |
93 | libm_hidden_weak (feraiseexcept) |