2007-04-30 Steven Munroe <sjmunroe@us.ibm.com>

            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.

4 files changed, 111 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_mask.c b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_mask.c
new file mode 100644
index 0000000000..c2452c7bc5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_mask.c
@@ -0,0 +1,68 @@
+/* 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;
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fe_nomask.c b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_nomask.c
index 8d3b9ad1f4..8d3b9ad1f4 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fe_nomask.c
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_nomask.c
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_mask.c b/sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_mask.c
new file mode 100644
index 0000000000..4c31c63c5c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_mask.c
@@ -0,0 +1,43 @@
+/* Procedure definition for FE_MASK_ENV for Linux/ppc64.
+   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 <sysdep.h>
+#include <sys/syscall.h>
+#include <sys/prctl.h>
+#include <kernel-features.h>
+
+const fenv_t *
+__fe_mask_env (void)
+{
+#if defined PR_SET_FPEXC && defined PR_FP_EXC_DISABLED
+  int result;
+  INTERNAL_SYSCALL_DECL (err);
+  result = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, PR_FP_EXC_DISABLED);
+# ifndef __ASSUME_NEW_PRCTL_SYSCALL
+  if (INTERNAL_SYSCALL_ERROR_P (result, err)
+      && INTERNAL_SYSCALL_ERRNO (result, err) == EINVAL)
+    __set_errno (ENOSYS);
+# endif
+#else
+  __set_errno (ENOSYS);
+#endif
+  return FE_DFL_ENV;
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/fe_nomask.c b/sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_nomask.c
index 62f735514a..62f735514a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/fe_nomask.c
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_nomask.c