69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
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/* Raise given exceptions.
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Copyright (C) 2006-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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int
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__feraiseexcept (int excepts)
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{
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/* Raise exceptions represented by EXCEPTS. But we must raise only one
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signal at a time. It is important that if the overflow/underflow
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exception and the divide by zero exception are given at the same
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time, the overflow/underflow exception follows the divide by zero
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exception.
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The Coldfire FPU allows an exception to be raised by asserting
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the associated EXC bit and then executing an arbitrary arithmetic
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instruction. fmove.l is classified as an arithmetic instruction
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and suffices for this purpose.
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We therefore raise an exception by setting both the EXC and AEXC
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bit associated with the exception (the former being 6 bits to the
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left of the latter) and then loading the longword at (%sp) into an
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FP register. */
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inline void
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raise_one_exception (int mask)
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{
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if (excepts & mask)
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{
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int fpsr;
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double unused;
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asm volatile ("fmove%.l %/fpsr,%0" : "=d" (fpsr));
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fpsr |= (mask << 6) | mask;
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asm volatile ("fmove%.l %0,%/fpsr" :: "d" (fpsr));
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asm volatile ("fmove%.l (%%sp),%0" : "=f" (unused));
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}
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}
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raise_one_exception (FE_INVALID);
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raise_one_exception (FE_DIVBYZERO);
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raise_one_exception (FE_OVERFLOW);
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raise_one_exception (FE_UNDERFLOW);
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raise_one_exception (FE_INEXACT);
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/* Success. */
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return 0;
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}
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libm_hidden_def (__feraiseexcept)
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weak_alias (__feraiseexcept, feraiseexcept)
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libm_hidden_weak (feraiseexcept)
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