113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/* Intel 387 floating point stuff.
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Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#include "ieee-float.h"
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struct ext_format ext_format_i387 = {
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/* tot sbyte smask expbyte manbyte */
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10, 9, 0x80, 9,8, 4,0 /* i387 */
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};
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/* FIXME: Eliminate these routines when we have the time to change all
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the callers. */
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void
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i387_to_double (from, to)
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char *from;
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char *to;
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{
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ieee_extended_to_double (&ext_format_i387, from, (double *)to);
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}
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void
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double_to_i387 (from, to)
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char *from;
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char *to;
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{
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double_to_ieee_extended (&ext_format_i387, (double *)from, to);
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}
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void
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print_387_control_word (control)
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unsigned int control;
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{
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printf ("control %s: ", local_hex_string(control));
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printf ("compute to ");
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switch ((control >> 8) & 3)
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{
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case 0: printf ("24 bits; "); break;
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case 1: printf ("(bad); "); break;
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case 2: printf ("53 bits; "); break;
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case 3: printf ("64 bits; "); break;
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}
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printf ("round ");
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switch ((control >> 10) & 3)
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{
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case 0: printf ("NEAREST; "); break;
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case 1: printf ("DOWN; "); break;
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case 2: printf ("UP; "); break;
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case 3: printf ("CHOP; "); break;
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}
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if (control & 0x3f)
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{
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printf ("mask:");
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if (control & 0x0001) printf (" INVALID");
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if (control & 0x0002) printf (" DENORM");
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if (control & 0x0004) printf (" DIVZ");
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if (control & 0x0008) printf (" OVERF");
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if (control & 0x0010) printf (" UNDERF");
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if (control & 0x0020) printf (" LOS");
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printf (";");
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}
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printf ("\n");
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if (control & 0xe080) warning ("reserved bits on: %s\n",
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local_hex_string(control & 0xe080));
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}
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void
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print_387_status_word (status)
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unsigned int status;
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{
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printf ("status %s: ", local_hex_string (status));
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if (status & 0xff)
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{
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printf ("exceptions:");
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if (status & 0x0001) printf (" INVALID");
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if (status & 0x0002) printf (" DENORM");
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if (status & 0x0004) printf (" DIVZ");
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if (status & 0x0008) printf (" OVERF");
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if (status & 0x0010) printf (" UNDERF");
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if (status & 0x0020) printf (" LOS");
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if (status & 0x0040) printf (" FPSTACK");
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printf ("; ");
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}
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printf ("flags: %d%d%d%d; ",
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(status & 0x4000) != 0,
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(status & 0x0400) != 0,
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(status & 0x0200) != 0,
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(status & 0x0100) != 0);
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printf ("top %d\n", (status >> 11) & 7);
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}
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