aboutsummaryrefslogtreecommitdiff
path: root/gdb/i387-tdep.c
blob: e2e55576ffea863fbc270554aa77bb22d77875ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
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;
{
  double_to_ieee_extended (&ext_format_i387, (double *)from, to);
}

void
print_387_control_word (control)
unsigned short control;
{
  printf ("control %s: ", local_hex_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",
				local_hex_string(control & 0xe080));
}

void
print_387_status_word (status)
     unsigned short status;
{
  printf ("status %s: ", local_hex_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);
}