i387-tdep.c revision 1.2 
1/* Intel 387 floating point stuff.
2   Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
3
4This file is part of GDB.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
19
20#include "defs.h"
21#include "frame.h"
22#include "inferior.h"
23#include "language.h"
24#include "gdbcore.h"
25#include "floatformat.h"
26
27/* FIXME:  Eliminate these routines when we have the time to change all
28   the callers.  */
29
30void
31i387_to_double (from, to)
32     char *from;
33     char *to;
34{
35  floatformat_to_double (&floatformat_i387_ext, from, (double *)to);
36}
37
38void
39double_to_i387 (from, to)
40     char *from;
41     char *to;
42{
43  floatformat_from_double (&floatformat_i387_ext, (double *)from, to);
44}
45
46void
47print_387_control_word (control)
48     unsigned int control;
49{
50  printf_unfiltered ("control %s: ", local_hex_string(control));
51  printf_unfiltered ("compute to ");
52  switch ((control >> 8) & 3)
53    {
54    case 0: printf_unfiltered ("24 bits; "); break;
55    case 1: printf_unfiltered ("(bad); "); break;
56    case 2: printf_unfiltered ("53 bits; "); break;
57    case 3: printf_unfiltered ("64 bits; "); break;
58    }
59  printf_unfiltered ("round ");
60  switch ((control >> 10) & 3)
61    {
62    case 0: printf_unfiltered ("NEAREST; "); break;
63    case 1: printf_unfiltered ("DOWN; "); break;
64    case 2: printf_unfiltered ("UP; "); break;
65    case 3: printf_unfiltered ("CHOP; "); break;
66    }
67  if (control & 0x3f)
68    {
69      printf_unfiltered ("mask:");
70      if (control & 0x0001) printf_unfiltered (" INVALID");
71      if (control & 0x0002) printf_unfiltered (" DENORM");
72      if (control & 0x0004) printf_unfiltered (" DIVZ");
73      if (control & 0x0008) printf_unfiltered (" OVERF");
74      if (control & 0x0010) printf_unfiltered (" UNDERF");
75      if (control & 0x0020) printf_unfiltered (" LOS");
76      printf_unfiltered (";");
77    }
78  printf_unfiltered ("\n");
79  if (control & 0xe080) warning ("reserved bits on: %s\n",
80				local_hex_string(control & 0xe080));
81}
82
83void
84print_387_status_word (status)
85     unsigned int status;
86{
87  printf_unfiltered ("status %s: ", local_hex_string (status));
88  if (status & 0xff)
89    {
90      printf_unfiltered ("exceptions:");
91      if (status & 0x0001) printf_unfiltered (" INVALID");
92      if (status & 0x0002) printf_unfiltered (" DENORM");
93      if (status & 0x0004) printf_unfiltered (" DIVZ");
94      if (status & 0x0008) printf_unfiltered (" OVERF");
95      if (status & 0x0010) printf_unfiltered (" UNDERF");
96      if (status & 0x0020) printf_unfiltered (" LOS");
97      if (status & 0x0040) printf_unfiltered (" FPSTACK");
98      printf_unfiltered ("; ");
99    }
100  printf_unfiltered ("flags: %d%d%d%d; ",
101	  (status & 0x4000) != 0,
102	  (status & 0x0400) != 0,
103	  (status & 0x0200) != 0,
104	  (status & 0x0100) != 0);
105
106  printf_unfiltered ("top %d\n", (status >> 11) & 7);
107}
108