i387-tdep.c revision 46283 
1/* Intel 387 floating point stuff.
2   Copyright (C) 1988, 1989, 1991, 1998 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
27void i387_to_double PARAMS ((char *, char *));
28
29void double_to_i387 PARAMS ((char *, char *));
30
31/* FIXME:  Eliminate these routines when we have the time to change all
32   the callers.  */
33
34void
35i387_to_double (from, to)
36     char *from;
37     char *to;
38{
39  floatformat_to_double (&floatformat_i387_ext, from, (double *)to);
40}
41
42void
43double_to_i387 (from, to)
44     char *from;
45     char *to;
46{
47  floatformat_from_double (&floatformat_i387_ext, (double *)from, to);
48}
49
50void
51print_387_control_word (control)
52     unsigned int control;
53{
54  printf_unfiltered ("control %s: ", local_hex_string(control));
55  printf_unfiltered ("compute to ");
56  switch ((control >> 8) & 3)
57    {
58    case 0: printf_unfiltered ("24 bits; "); break;
59    case 1: printf_unfiltered ("(bad); "); break;
60    case 2: printf_unfiltered ("53 bits; "); break;
61    case 3: printf_unfiltered ("64 bits; "); break;
62    }
63  printf_unfiltered ("round ");
64  switch ((control >> 10) & 3)
65    {
66    case 0: printf_unfiltered ("NEAREST; "); break;
67    case 1: printf_unfiltered ("DOWN; "); break;
68    case 2: printf_unfiltered ("UP; "); break;
69    case 3: printf_unfiltered ("CHOP; "); break;
70    }
71  if (control & 0x3f)
72    {
73      printf_unfiltered ("mask:");
74      if (control & 0x0001) printf_unfiltered (" INVALID");
75      if (control & 0x0002) printf_unfiltered (" DENORM");
76      if (control & 0x0004) printf_unfiltered (" DIVZ");
77      if (control & 0x0008) printf_unfiltered (" OVERF");
78      if (control & 0x0010) printf_unfiltered (" UNDERF");
79      if (control & 0x0020) printf_unfiltered (" LOS");
80      printf_unfiltered (";");
81    }
82  printf_unfiltered ("\n");
83  if (control & 0xe080) warning ("reserved bits on: %s\n",
84				local_hex_string(control & 0xe080));
85}
86
87void
88print_387_status_word (status)
89     unsigned int status;
90{
91  printf_unfiltered ("status %s: ", local_hex_string (status));
92  if (status & 0xff)
93    {
94      printf_unfiltered ("exceptions:");
95      if (status & 0x0001) printf_unfiltered (" INVALID");
96      if (status & 0x0002) printf_unfiltered (" DENORM");
97      if (status & 0x0004) printf_unfiltered (" DIVZ");
98      if (status & 0x0008) printf_unfiltered (" OVERF");
99      if (status & 0x0010) printf_unfiltered (" UNDERF");
100      if (status & 0x0020) printf_unfiltered (" LOS");
101      if (status & 0x0040) printf_unfiltered (" FPSTACK");
102      printf_unfiltered ("; ");
103    }
104  printf_unfiltered ("flags: %d%d%d%d; ",
105	  (status & 0x4000) != 0,
106	  (status & 0x0400) != 0,
107	  (status & 0x0200) != 0,
108	  (status & 0x0100) != 0);
109
110  printf_unfiltered ("top %d\n", (status >> 11) & 7);
111}
112