1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/fesetenv.c b/sysdeps/i386/fpu/fesetenv.c
new file mode 100644
index 0000000000..e7300ea1e6
--- /dev/null
+++ b/sysdeps/i386/fpu/fesetenv.c
@@ -0,0 +1,76 @@
+/* Install given floating-point environment.
+   Copyright (C) 1997 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fenv.h>
+
+#include <assert.h>
+
+
+void
+fesetenv (const fenv_t *envp)
+{
+  fenv_t temp;
+
+  /* The memory block used by fstenv/fldenv has a size of 28 bytes.  */
+  assert (sizeof (fenv_t) == 28);
+
+  /* Install the environment specified by ENVP.  But there are a few
+     values which we do not want to come from the saved environment.
+     Therefore, we get the current environment and replace the values
+     we want to use from the environment specified by the parameter.  */
+  __asm__ ("fnstenv %0" : "=m" (*&temp));
+
+  if (envp == FE_DFL_ENV)
+    {
+      temp.control_word |= FE_ALL_EXCEPT;
+      temp.control_word &= ~FE_TOWARDSZERO;
+      temp.status_word &= ~FE_ALL_EXCEPT;
+      temp.eip = 0;
+      temp.cs_selector = 0;
+      temp.opcode = 0;
+      temp.data_offset = 0;
+      temp.data_selector = 0;
+    }
+  else if (envp == FE_NOMASK_ENV)
+    {
+      temp.control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDSZERO);
+      temp.status_word &= ~FE_ALL_EXCEPT;
+      temp.eip = 0;
+      temp.cs_selector = 0;
+      temp.opcode = 0;
+      temp.data_offset = 0;
+      temp.data_selector = 0;
+    }
+  else
+    {
+      temp.control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDSZERO);
+      temp.control_word |= (envp->control_word
+			    & (FE_ALL_EXCEPT | FE_TOWARDSZERO));
+      temp.status_word &= ~FE_ALL_EXCEPT;
+      temp.status_word |= envp->status_word & FE_ALL_EXCEPT;
+      temp.eip = envp->eip;
+      temp.cs_selector = envp->cs_selector;
+      temp.opcode = envp->opcode;
+      temp.data_offset = envp->data_offset;
+      temp.data_selector = envp->data_selector;
+    }
+
+  __asm__ ("fldenv %0" : : "m" (temp));
+}