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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
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/* Store current floating-point environment and clear exceptions.
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e500 version.
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Copyright (C) 2004-2013 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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feholdexcept (fenv_t *envp)
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{
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fenv_union_t u;
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INTERNAL_SYSCALL_DECL (err);
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int r;
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/* Get the current state. */
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r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]);
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if (INTERNAL_SYSCALL_ERROR_P (r, err))
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return -1;
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u.l[1] = fegetenv_register ();
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*envp = u.fenv;
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/* Clear everything except for the rounding mode and trapping to the
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kernel. */
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u.l[0] &= ~(PR_FP_EXC_DIV
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| PR_FP_EXC_OVF
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| PR_FP_EXC_UND
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| PR_FP_EXC_RES
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| PR_FP_EXC_INV);
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u.l[1] &= SPEFSCR_FRMC | (SPEFSCR_ALL_EXCEPT_ENABLE & ~SPEFSCR_FINXE);
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/* Put the new state in effect. */
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fesetenv_register (u.l[1]);
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r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
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u.l[0] | 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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return 0;
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}
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libm_hidden_def (feholdexcept)
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