mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* 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)
|