Implement fegetexceptflag for ARM EABI, fix fesetexceptflag

["Joseph S. Myers" <joseph at codesourcery dot com>]

Further to my patch 
<http://sourceware.org/ml/libc-ports/2008-06/msg00004.html> implementing 
feupdateenv for ARM EABI, it turns out that fegetexceptflag was missing as 
well; this patch implements that function.  Also, fesetexceptflag was 
operating on the wrong bits of the control word (the mask of enabled 
exceptions); this patch fixes that as well.  (There are no tests of either 
function in the glibc testsuite.)

2008-06-30  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/arm/eabi/fgetexcptflg.c: New.
	* sysdeps/arm/eabi/fsetexcptflg.c (__fesetexceptflag): Operate on
	set exception flags, not on mask of enabled exceptions.

diff -rupN ports.orig/sysdeps/arm/eabi/fgetexcptflg.c ports/sysdeps/arm/eabi/fgetexcptflg.c
--- ports.orig/sysdeps/arm/eabi/fgetexcptflg.c	1970-01-01 00:00:00.000000000 +0000
+++ ports/sysdeps/arm/eabi/fgetexcptflg.c	2008-06-30 15:43:40.000000000 +0000
@@ -0,0 +1,54 @@
+/* Store current representation for exceptions.
+   Copyright (C) 1997, 1999, 2000, 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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 <fpu_control.h>
+
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <dl-procinfo.h>
+#include <sysdep.h>
+
+int
+__fegetexceptflag (fexcept_t *flagp, int excepts)
+{
+  if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
+    {
+      unsigned long temp;
+
+      /* Get the current exceptions.  */
+      _FPU_GETCW (temp);
+
+      *flagp = temp & excepts & FE_ALL_EXCEPT;
+
+      /* Success.  */
+      return 0;
+    }
+
+  /* Unsupported, so fail.  */
+  return 1;
+}
+
+#include <shlib-compat.h>
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
+strong_alias (__fegetexceptflag, __old_fegetexceptflag)
+compat_symbol (libm, __old_fegetexceptflag, fegetexceptflag, GLIBC_2_1);
+#endif
+versioned_symbol (libm, __fegetexceptflag, fegetexceptflag, GLIBC_2_2);
diff -rupN ports.orig/sysdeps/arm/eabi/fsetexcptflg.c ports/sysdeps/arm/eabi/fsetexcptflg.c
--- ports.orig/sysdeps/arm/eabi/fsetexcptflg.c	2006-10-31 17:32:11.000000000 +0000
+++ ports/sysdeps/arm/eabi/fsetexcptflg.c	2008-06-30 15:43:39.000000000 +0000
@@ -1,5 +1,5 @@
 /* Set floating-point environment exception handling.
-   Copyright (C) 1997,98,99,2000,01,05 Free Software Foundation, Inc.
+   Copyright (C) 1997,98,99,2000,01,05,08 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
@@ -37,8 +37,8 @@ __fesetexceptflag (const fexcept_t *flag
       _FPU_GETCW (temp);
 
       /* Set the desired exception mask.  */
-      temp &= ~((excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT);
-      temp |= (*flagp & excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT;
+      temp &= ~(excepts & FE_ALL_EXCEPT);
+      temp |= (*flagp & excepts & FE_ALL_EXCEPT);
 
       /* Save state back to the FPU.  */
       _FPU_SETCW (temp);

-- 
Joseph S. Myers
joseph@codesourcery.com