1 /* Intel 387 floating point stuff.
2 Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include "ieee-float.h"
28 #include <sys/types.h>
31 #include <sys/param.h>
34 #include <sys/ioctl.h>
42 struct ext_format ext_format_i387 = {
43 /* tot sbyte smask expbyte manbyte */
44 10, 9, 0x80, 9,8, 4,0 /* i387 */
47 /* FIXME: Eliminate these routines when we have the time to change all
51 i387_to_double (from, to)
55 ieee_extended_to_double (&ext_format_i387, from, (double *)to);
59 double_to_i387 (from, to)
63 double_to_ieee_extended (&ext_format_i387, (double *)from, to);
67 print_387_control_word (control)
70 printf ("control %s: ", local_hex_string(control));
71 printf ("compute to ");
72 switch ((control >> 8) & 3)
74 case 0: printf ("24 bits; "); break;
75 case 1: printf ("(bad); "); break;
76 case 2: printf ("53 bits; "); break;
77 case 3: printf ("64 bits; "); break;
80 switch ((control >> 10) & 3)
82 case 0: printf ("NEAREST; "); break;
83 case 1: printf ("DOWN; "); break;
84 case 2: printf ("UP; "); break;
85 case 3: printf ("CHOP; "); break;
90 if (control & 0x0001) printf (" INVALID");
91 if (control & 0x0002) printf (" DENORM");
92 if (control & 0x0004) printf (" DIVZ");
93 if (control & 0x0008) printf (" OVERF");
94 if (control & 0x0010) printf (" UNDERF");
95 if (control & 0x0020) printf (" LOS");
99 if (control & 0xe080) warning ("reserved bits on: %s\n",
100 local_hex_string(control & 0xe080));
104 print_387_status_word (status)
107 printf ("status %s: ", local_hex_string (status));
110 printf ("exceptions:");
111 if (status & 0x0001) printf (" INVALID");
112 if (status & 0x0002) printf (" DENORM");
113 if (status & 0x0004) printf (" DIVZ");
114 if (status & 0x0008) printf (" OVERF");
115 if (status & 0x0010) printf (" UNDERF");
116 if (status & 0x0020) printf (" LOS");
117 if (status & 0x0040) printf (" FPSTACK");
120 printf ("flags: %d%d%d%d; ",
121 (status & 0x4000) != 0,
122 (status & 0x0400) != 0,
123 (status & 0x0200) != 0,
124 (status & 0x0100) != 0);
126 printf ("top %d\n", (status >> 11) & 7);