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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Enable floating-point exceptions. e500 version.
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Copyright (C) 2004-2014 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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<http://www.gnu.org/licenses/>. */
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#include <fenv_libc.h>
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#include <sysdep.h>
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#include <sys/prctl.h>
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int
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feenableexcept (int excepts)
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{
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unsigned int result = 0, pflags, r;
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INTERNAL_SYSCALL_DECL (err);
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r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
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if (INTERNAL_SYSCALL_ERROR_P (r, err))
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return -1;
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/* Save old enable bits. */
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result = __fexcepts_from_prctl (pflags);
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pflags |= __fexcepts_to_prctl (excepts);
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r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
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pflags | PR_FP_EXC_SW_ENABLE);
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if (INTERNAL_SYSCALL_ERROR_P (r, err))
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return -1;
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/* If enabling signals for "inexact", also enable trapping to the
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kernel. */
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if ((excepts & FE_INEXACT) != 0)
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{
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unsigned long fpescr;
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fpescr = fegetenv_register ();
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fpescr |= SPEFSCR_FINXE;
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fesetenv_register (fpescr);
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}
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return result;
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}
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