From 528be9fe8e08d78481d681c9ce23af6ba60ed2f5 Mon Sep 17 00:00:00 2001
From: Andreas Jaeger <aj@suse.de>
Date: Mon, 21 Aug 2000 17:06:46 +0000
Subject: Add sys/procfs.h.

---
 sysdeps/s390/fpu/fegetenv.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 sysdeps/s390/fpu/fegetenv.c

(limited to 'sysdeps/s390/fpu/fegetenv.c')

diff --git a/sysdeps/s390/fpu/fegetenv.c b/sysdeps/s390/fpu/fegetenv.c
new file mode 100644
index 0000000..4140a8b
--- /dev/null
+++ b/sysdeps/s390/fpu/fegetenv.c
@@ -0,0 +1,43 @@
+/* Store current 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
+fegetenv (fenv_t *envp)
+{
+  /* The S/390 IEEE fpu doesn't keep track of the ieee instruction pointer.
+     To get around that the kernel will store the address of the last
+     fpu fault to the process structure. This ptrace call reads this value
+     from the kernel space. That means the ieee_instruction_pointer is
+     only correct after a fpu fault. That's the best we can do, there is
+     no way to find out the ieee instruction pointer if there was no fault.  */
+  _FPU_GETCW (envp->fpc);
+  envp->ieee_instruction_pointer =
+    ptrace (PTRACE_PEEKUSER, getpid (), PT_IEEE_IP);
+
+  /* Success.  */
+  return 0;
+}
-- 
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