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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Procedure definition for FE_NOMASK_ENV for Linux/ppc.
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Copyright (C) 2000, 2006, 2008 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <fenv_libc.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <sys/prctl.h>
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#include <kernel-features.h>
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#if __ASSUME_NEW_PRCTL_SYSCALL == 0
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/* This is rather fiddly under Linux. We don't have direct access,
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and there is no system call, but we can change the bits
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in a signal handler's context... */
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static struct sigaction oact;
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static void
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fe_nomask_handler (int signum, struct sigcontext *sc)
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{
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sc->regs->msr |= 0x900ul; /* FE0 | FE1 */
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sigaction (SIGUSR1, &oact, NULL);
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}
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#endif
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const fenv_t *
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__fe_nomask_env (void)
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{
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#if __ASSUME_NEW_PRCTL_SYSCALL == 0
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# if defined PR_SET_FPEXC && defined PR_FP_EXC_PRECISE
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int result = INLINE_SYSCALL (prctl, 2, PR_SET_FPEXC, PR_FP_EXC_PRECISE);
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if (result == -1 && errno == EINVAL)
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# endif
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{
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struct sigaction act;
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act.sa_handler = (sighandler_t) fe_nomask_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction (SIGUSR1, &act, &oact);
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raise (SIGUSR1);
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}
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#else
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INTERNAL_SYSCALL_DECL (err);
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INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, PR_FP_EXC_PRECISE);
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#endif
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return FE_ENABLED_ENV;
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}
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libm_hidden_def (__fe_nomask_env)
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