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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/fedisblxcpt.c
parent7a40ba19c86e4d2fc7e35f14a0e629ee843b96a9 (diff)
From Steve Papacharalambous:
Add math support for PowerPC e500.
Diffstat (limited to 'libm/powerpc/e500/fpu/fedisblxcpt.c')
-rw-r--r--libm/powerpc/e500/fpu/fedisblxcpt.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/libm/powerpc/e500/fpu/fedisblxcpt.c b/libm/powerpc/e500/fpu/fedisblxcpt.c
new file mode 100644
index 000000000..d2c5caba7
--- /dev/null
+++ b/libm/powerpc/e500/fpu/fedisblxcpt.c
@@ -0,0 +1,60 @@
+/* Disable floating-point 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
+fedisableexcept (int excepts)
+{
+ unsigned int result = 0, pflags, r;
+ INTERNAL_SYSCALL_DECL (err);
+
+ INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
+
+ /* Save old enable bits. */
+ if (pflags & PR_FP_EXC_OVF)
+ result |= FE_OVERFLOW;
+ if (pflags & PR_FP_EXC_UND)
+ result |= FE_UNDERFLOW;
+ if (pflags & PR_FP_EXC_INV)
+ result |= FE_INVALID;
+ if (pflags & PR_FP_EXC_DIV)
+ result |= FE_DIVBYZERO;
+ if (pflags & PR_FP_EXC_RES)
+ result |= FE_INEXACT;
+
+ if (excepts & FE_INEXACT)
+ pflags &= ~PR_FP_EXC_RES;
+ if (excepts & FE_DIVBYZERO)
+ pflags &= ~PR_FP_EXC_DIV;
+ if (excepts & FE_UNDERFLOW)
+ pflags &= ~PR_FP_EXC_UND;
+ if (excepts & FE_OVERFLOW)
+ pflags &= ~PR_FP_EXC_OVF;
+ if (excepts & FE_INVALID)
+ pflags &= ~PR_FP_EXC_INV;
+ r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, pflags);
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
+ return -1;
+
+ return result;
+}