mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
4a59e9adcb
Peter Bergner <bergner@us.ibm.com> * sysdeps/powerpc/bits/fenv.h: Declare __fe_mask_env extern. Define FE_NOMASK_ENV as FE_EANBLED_ENV. Define FE_MASK_ENV. * sysdeps/powerpc/fpu/Makefile: Add fe_mask to libm-support. * sysdeps/powerpc/fpu/fe_mask.c: New file. * sysdeps/powerpc/fpu/fe_nomask.c: Correct comment. * sysdeps/powerpc/fpu/fedisblxcpt.c (fedisableexcept): Call __fe_mask_env() if all FP exceptions disabled. * sysdeps/powerpc/fpu/feholdexcpt.c (feholdexcept): Copy high 32-bits from old FPSCR to new fenv to propagate DFP rounding modes. Call __fe_mask_env() if FP exceptions previously enabled. * sysdeps/powerpc/fpu/fesetenv.c (fesetenv): Change mask to merge exceptions from env. Use __fe_nomask_env() or __fe_mask_env() when transitioning from all exceptions disabled to any exception enabled or visa versa. * sysdeps/powerpc/fpu/feupdateenv.c (__feupdateenv): Change mask to merge exceptions from env. Call __fe_nomask_env or __fe_mask_env when transitioning from all exceptions disabled to any exception enabled or visa versa. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fe_nomask.c: Moved to... * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_nomask.c: ...here. * sysdeps/unix/sysv/linux/powerpc/powerpc64/fe_nomask.c: Moved to... * sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_nomask.c: ...here. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_mask.c: New file. * sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_mask.c: New file.
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/* Procedure definition for FE_MASK_ENV for Linux/ppc.
|
|
Copyright (C) 2007 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <fenv.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <sysdep.h>
|
|
#include <sys/prctl.h>
|
|
#include <kernel-features.h>
|
|
|
|
#if __ASSUME_NEW_PRCTL_SYSCALL == 0
|
|
/* This is rather fiddly under Linux. We don't have direct access,
|
|
and there is no system call, but we can change the bits
|
|
in a signal handler's context... */
|
|
|
|
static struct sigaction oact;
|
|
|
|
static void
|
|
fe_mask_handler (int signum, struct sigcontext *sc)
|
|
{
|
|
sc->regs->msr &= ~0x900ul; /* FE0 | FE1 */
|
|
sigaction (SIGUSR1, &oact, NULL);
|
|
}
|
|
#endif
|
|
|
|
const fenv_t *
|
|
__fe_mask_env (void)
|
|
{
|
|
#if __ASSUME_NEW_PRCTL_SYSCALL == 0
|
|
# if defined PR_SET_FPEXC && defined PR_FP_EXC_DISABLED
|
|
int result = INLINE_SYSCALL (prctl, 2, PR_SET_FPEXC, PR_FP_EXC_DISABLED);
|
|
|
|
if (result == -1 && errno == EINVAL)
|
|
# endif
|
|
{
|
|
struct sigaction act;
|
|
|
|
act.sa_handler = (sighandler_t) fe_mask_handler;
|
|
sigemptyset (&act.sa_mask);
|
|
act.sa_flags = 0;
|
|
|
|
sigaction (SIGUSR1, &act, &oact);
|
|
raise (SIGUSR1);
|
|
}
|
|
#else
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, PR_FP_EXC_DISABLED);
|
|
#endif
|
|
|
|
return FE_DFL_ENV;
|
|
}
|