1 files changed, 56 insertions, 0 deletions
diff --git a/sysdeps/s390/fpu/fesetenv.c b/sysdeps/s390/fpu/fesetenv.c
new file mode 100644
index 0000000000..93c97a32ef
--- /dev/null
+++ b/sysdeps/s390/fpu/fesetenv.c
@@ -0,0 +1,56 @@
+/* Install given floating-point environment.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
+
+   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_libc.h>
+#include <fpu_control.h>
+#include <stddef.h>
+#include <asm/ptrace.h>
+#include <sys/ptrace.h>
+#include <unistd.h>
+
+int
+fesetenv (const fenv_t *envp)
+{
+  fenv_t env;
+
+  if (envp == FE_DFL_ENV)
+    {
+      env.fpc = _FPU_DEFAULT;
+      env.ieee_instruction_pointer = 0;
+    }
+  else if (envp == FE_NOMASK_ENV)
+    {
+      env.fpc = FPC_EXCEPTION_MASK;
+      env.ieee_instruction_pointer = 0;
+    }
+  else
+    env = (*envp);
+
+  /* The S/390 IEEE fpu doesn't have a register for the ieee
+     instruction pointer. The operating system is required to keep an
+     instruction pointer on a per process base. We read and write this
+     value with the ptrace interface.  */
+  _FPU_SETCW (env.fpc);
+  ptrace (PTRACE_POKEUSER, getpid (), PT_IEEE_IP,
+	  env.ieee_instruction_pointer);
+
+  /* Success.  */
+  return 0;
+}