| /* Raise given exceptions. |
| Copyright (C) 2006-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <fenv.h> |
| #include <float.h> |
| #include <math.h> |
| |
| int |
| feraiseexcept (int excepts) |
| { |
| /* Raise exceptions represented by EXCEPTS. But we must raise only one |
| signal at a time. It is important that if the overflow/underflow |
| exception and the divide by zero exception are given at the same |
| time, the overflow/underflow exception follows the divide by zero |
| exception. |
| |
| The Coldfire FPU allows an exception to be raised by asserting |
| the associated EXC bit and then executing an arbitrary arithmetic |
| instruction. fmove.l is classified as an arithmetic instruction |
| and suffices for this purpose. |
| |
| We therefore raise an exception by setting both the EXC and AEXC |
| bit associated with the exception (the former being 6 bits to the |
| left of the latter) and then loading the longword at (%sp) into an |
| FP register. */ |
| |
| inline void |
| raise_one_exception (int mask) |
| { |
| if (excepts & mask) |
| { |
| int fpsr; |
| double unused; |
| |
| asm volatile ("fmove%.l %/fpsr,%0" : "=d" (fpsr)); |
| fpsr |= (mask << 6) | mask; |
| asm volatile ("fmove%.l %0,%/fpsr" :: "d" (fpsr)); |
| asm volatile ("fmove%.l (%%sp),%0" : "=f" (unused)); |
| } |
| } |
| |
| raise_one_exception (FE_INVALID); |
| raise_one_exception (FE_DIVBYZERO); |
| raise_one_exception (FE_OVERFLOW); |
| raise_one_exception (FE_UNDERFLOW); |
| raise_one_exception (FE_INEXACT); |
| |
| /* Success. */ |
| return 0; |
| } |
| libm_hidden_def (feraiseexcept) |
