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authorJoakim Tjernlund <joakim.tjernlund@transmode.se>2007-03-31 13:28:15 +0000
committerJoakim Tjernlund <joakim.tjernlund@transmode.se>2007-03-31 13:28:15 +0000
commite7bcf43b6440ac9fc61a0eef5591393810daafb5 (patch)
treeb72c3fb15e030b47b2eb02d13169b4548382e855 /libm/powerpc/e500/fpu/feupdateenv.c
parent7a40ba19c86e4d2fc7e35f14a0e629ee843b96a9 (diff)
From Steve Papacharalambous:
Add math support for PowerPC e500.
Diffstat (limited to 'libm/powerpc/e500/fpu/feupdateenv.c')
-rw-r--r--libm/powerpc/e500/fpu/feupdateenv.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/libm/powerpc/e500/fpu/feupdateenv.c b/libm/powerpc/e500/fpu/feupdateenv.c
new file mode 100644
index 000000000..03f3af8d9
--- /dev/null
+++ b/libm/powerpc/e500/fpu/feupdateenv.c
@@ -0,0 +1,49 @@
+/* Install given floating-point environment and raise exceptions.
+ Copyright (C) 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Aldy Hernandez <aldyh@redhat.com>, 2004.
+
+ 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_libc.h"
+#include <syscall.h>
+#include <sys/prctl.h>
+
+int
+__feupdateenv (const fenv_t *envp)
+{
+ unsigned long fpescr, old, new, pflags;
+ fenv_union_t u;
+ INTERNAL_SYSCALL_DECL (err);
+
+ /* Save the currently set exceptions. */
+ u.fenv = *envp;
+ new = u.l[1];
+ old = fegetenv_register ();
+ new |= (old & FE_ALL_EXCEPT);
+
+ INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
+ pflags |= u.l[0];
+ INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, pflags);
+
+ /* Enable and raise (if appropriate) exceptions set in `new'. */
+ fesetenv_register (new);
+ feraiseexcept (new & FE_ALL_EXCEPT);
+
+ /* Success. */
+ return 0;
+}
+