1 | /* Raise given exceptions. |
2 | Copyright (C) 2006-2024 Free Software Foundation, Inc. |
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 |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the 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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv.h> |
20 | #include <float.h> |
21 | #include <math.h> |
22 | |
23 | int |
24 | __feraiseexcept (int excepts) |
25 | { |
26 | /* Raise exceptions represented by EXCEPTS. But we must raise only one |
27 | signal at a time. It is important that if the overflow/underflow |
28 | exception and the divide by zero exception are given at the same |
29 | time, the overflow/underflow exception follows the divide by zero |
30 | exception. |
31 | |
32 | The Coldfire FPU allows an exception to be raised by asserting |
33 | the associated EXC bit and then executing an arbitrary arithmetic |
34 | instruction. fmove.l is classified as an arithmetic instruction |
35 | and suffices for this purpose. |
36 | |
37 | We therefore raise an exception by setting both the EXC and AEXC |
38 | bit associated with the exception (the former being 6 bits to the |
39 | left of the latter) and then loading the longword at (%sp) into an |
40 | FP register. */ |
41 | |
42 | inline void |
43 | raise_one_exception (int mask) |
44 | { |
45 | if (excepts & mask) |
46 | { |
47 | int fpsr; |
48 | double unused; |
49 | |
50 | asm volatile ("fmove%.l %/fpsr,%0" : "=d" (fpsr)); |
51 | fpsr |= (mask << 6) | mask; |
52 | asm volatile ("fmove%.l %0,%/fpsr" :: "d" (fpsr)); |
53 | asm volatile ("fmove%.l (%%sp),%0" : "=f" (unused)); |
54 | } |
55 | } |
56 | |
57 | raise_one_exception (FE_INVALID); |
58 | raise_one_exception (FE_DIVBYZERO); |
59 | raise_one_exception (FE_OVERFLOW); |
60 | raise_one_exception (FE_UNDERFLOW); |
61 | raise_one_exception (FE_INEXACT); |
62 | |
63 | /* Success. */ |
64 | return 0; |
65 | } |
66 | libm_hidden_def (__feraiseexcept) |
67 | weak_alias (__feraiseexcept, feraiseexcept) |
68 | libm_hidden_weak (feraiseexcept) |
69 | |