* i387-tdep.c: New file, consolidates most 80387 support,

and eliminates host dependency on double<->extended conversions.

diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c
new file mode 100644 (file)
index 0000000..4cdd719
--- /dev/null
+++ b/gdb/i387-tdep.c
@@ -0,0 +1,127 @@
+/* Intel 387 floating point stuff.
+   Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <stdio.h>
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+#include "language.h"
+#include "gdbcore.h"
+#include "ieee-float.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/file.h>
+#include <sys/stat.h>
+
+#include <sys/reg.h>
+
+struct ext_format ext_format_i387 = {
+/* tot sbyte smask expbyte     manbyte */
+   10, 9,    0x80, 9,8,                4,0             /* i387 */
+};
+
+/* FIXME:  Eliminate these routines when we have the time to change all
+   the callers.  */
+void
+i387_to_double (from, to)
+     char *from, *to;
+{
+  ieee_extended_to_double (&ext_format_i387, from, (double *)to);
+}
+
+void
+double_to_i387 (from, to)
+     char *from, *to;
+{
+  ieee_double_to_extended (&ext_format_i387, (double *)from, to);
+}
+
+void
+print_387_control_word (control)
+unsigned short control;
+{
+  printf ("control %s: ", hex_to_string(control));
+  printf ("compute to ");
+  switch ((control >> 8) & 3) 
+    {
+    case 0: printf ("24 bits; "); break;
+    case 1: printf ("(bad); "); break;
+    case 2: printf ("53 bits; "); break;
+    case 3: printf ("64 bits; "); break;
+    }
+  printf ("round ");
+  switch ((control >> 10) & 3) 
+    {
+    case 0: printf ("NEAREST; "); break;
+    case 1: printf ("DOWN; "); break;
+    case 2: printf ("UP; "); break;
+    case 3: printf ("CHOP; "); break;
+    }
+  if (control & 0x3f) 
+    {
+      printf ("mask:");
+      if (control & 0x0001) printf (" INVALID");
+      if (control & 0x0002) printf (" DENORM");
+      if (control & 0x0004) printf (" DIVZ");
+      if (control & 0x0008) printf (" OVERF");
+      if (control & 0x0010) printf (" UNDERF");
+      if (control & 0x0020) printf (" LOS");
+      printf (";");
+    }
+  printf ("\n");
+  if (control & 0xe080) printf ("warning: reserved bits on: %s\n",
+                               hex_to_string(control & 0xe080));
+}
+
+void
+print_387_status_word (status)
+     unsigned short status;
+{
+  printf ("status %s: ", hex_to_string (status));
+  if (status & 0xff) 
+    {
+      printf ("exceptions:");
+      if (status & 0x0001) printf (" INVALID");
+      if (status & 0x0002) printf (" DENORM");
+      if (status & 0x0004) printf (" DIVZ");
+      if (status & 0x0008) printf (" OVERF");
+      if (status & 0x0010) printf (" UNDERF");
+      if (status & 0x0020) printf (" LOS");
+      if (status & 0x0040) printf (" FPSTACK");
+      printf ("; ");
+    }
+  printf ("flags: %d%d%d%d; ",
+         (status & 0x4000) != 0,
+         (status & 0x0400) != 0,
+         (status & 0x0200) != 0,
+         (status & 0x0100) != 0);
+  
+  printf ("top %d\n", (status >> 11) & 7);
+}