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- /* 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 "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "language.h"
- #include "gdbcore.h"
- #include "ieee-float.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;
- char *to;
- {
- ieee_extended_to_double (&ext_format_i387, from, (double *)to);
- }
-
- void
- double_to_i387 (from, to)
- char *from;
- char *to;
- {
- double_to_ieee_extended (&ext_format_i387, (double *)from, to);
- }
-
- void
- print_387_control_word (control)
- unsigned int 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) warning ("reserved bits on: %s\n",
- local_hex_string(control & 0xe080));
- }
-
- void
- print_387_status_word (status)
- unsigned int 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);
- }
-