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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);
/* FIXME: Someone claims this should be 7 - (status >> 11) & 7 for AIX.
What's the story? Is the following just wrong or are differing
notations in use? */
printf ("top %d\n", (status >> 11) & 7);
}
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