Linux/HPPA specific fesetenv implementation.

1 files changed, 70 insertions, 0 deletions

diff --git a/sysdeps/hppa/fpu/fesetenv.c b/sysdeps/hppa/fpu/fesetenv.c
new file mode 100644
index 0000000000..4bfbefdd9b
--- /dev/null
+++ b/sysdeps/hppa/fpu/fesetenv.c
@@ -0,0 +1,70 @@
+/* Install given floating-point environment.
+   Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Huggins-Daines <dhd@debian.org>, 2000
+   Based on the m68k version by
+   Andreas Schwab <schwab@suse.de>
+
+   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>
+
+int
+fesetenv (const fenv_t *envp)
+{
+  fenv_t temp;
+
+  /* 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.  */
+  {
+    fenv_t * _regs = &temp;
+    __asm__ (
+	     "fstd %%fr0,0(%2)\n"
+	     "fstd,ma %%fr1,8(%2)\n"
+	     "fstd,ma %%fr2,8(%2)\n"
+	     "fstd %%fr3,0(%2)\n"
+	     : "=m" (*_regs), "=r" (_regs) : "1" (_regs));
+  }
+
+  temp.__status_word &= ~(FE_ALL_EXCEPT
+			  | (FE_ALL_EXCEPT << 27)
+			  | FE_DOWNWARD);
+  if (envp == FE_DFL_ENV)
+    ;
+  else if (envp == FE_NOMASK_ENV)
+    temp.__status_word |= FE_ALL_EXCEPT;
+  else
+    temp.__status_word |= (envp->__status_word
+			   & (FE_ALL_EXCEPT
+			      | FE_DOWNWARD
+			      | (FE_ALL_EXCEPT << 27)));
+
+  /* Load the new environment. */
+  {
+    fenv_t * _regs = &temp + 1;
+    __asm__ (
+	     "fldd,mb -8(%2),%%fr3\n"
+	     "fldd,mb -8(%2),%%fr2\n"
+	     "fldd,mb -8(%2),%%fr1\n"
+	     "fldd -8(%2),%%fr0\n"
+	     : "=m" (*_regs), "=r" (_regs) : "1" (_regs));
+  }
+
+  /* Success.  */
+  return 0;
+}