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/* Intel 387 floating point stuff.
Copyright (C) 1988, 1989, 1991, 1998 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "value.h"
#include "gdbcore.h"
#include "floatformat.h"
void i387_to_double PARAMS ((char *, char *));
void double_to_i387 PARAMS ((char *, char *));
static void print_387_control_bits PARAMS ((unsigned int control));
static void print_387_status_bits PARAMS ((unsigned int status));
/* FIXME: Eliminate these routines when we have the time to change all
the callers. */
void
i387_to_double (from, to)
char *from;
char *to;
{
floatformat_to_double (&floatformat_i387_ext, from, (double *) to);
}
void
double_to_i387 (from, to)
char *from;
char *to;
{
floatformat_from_double (&floatformat_i387_ext, (double *) from, to);
}
static void
print_387_control_bits (control)
unsigned int control;
{
switch ((control >> 8) & 3)
{
case 0:
puts_unfiltered (" 24 bit; ");
break;
case 1:
puts_unfiltered (" (bad); ");
break;
case 2:
puts_unfiltered (" 53 bit; ");
break;
case 3:
puts_unfiltered (" 64 bit; ");
break;
}
switch ((control >> 10) & 3)
{
case 0:
puts_unfiltered ("NEAR; ");
break;
case 1:
puts_unfiltered ("DOWN; ");
break;
case 2:
puts_unfiltered ("UP; ");
break;
case 3:
puts_unfiltered ("CHOP; ");
break;
}
if (control & 0x3f)
{
puts_unfiltered ("mask");
if (control & 0x0001)
puts_unfiltered (" INVAL");
if (control & 0x0002)
puts_unfiltered (" DENOR");
if (control & 0x0004)
puts_unfiltered (" DIVZ");
if (control & 0x0008)
puts_unfiltered (" OVERF");
if (control & 0x0010)
puts_unfiltered (" UNDER");
if (control & 0x0020)
puts_unfiltered (" LOS");
puts_unfiltered (";");
}
if (control & 0xe080)
warning ("\nreserved bits on: %s",
local_hex_string (control & 0xe080));
}
void
print_387_control_word (control)
unsigned int control;
{
printf_filtered ("control %s:", local_hex_string(control & 0xffff));
print_387_control_bits (control);
puts_unfiltered ("\n");
}
static void
print_387_status_bits (status)
unsigned int status;
{
printf_unfiltered (" flags %d%d%d%d; ",
(status & 0x4000) != 0,
(status & 0x0400) != 0,
(status & 0x0200) != 0,
(status & 0x0100) != 0);
printf_unfiltered ("top %d; ", (status >> 11) & 7);
if (status & 0xff)
{
puts_unfiltered ("excep");
if (status & 0x0001) puts_unfiltered (" INVAL");
if (status & 0x0002) puts_unfiltered (" DENOR");
if (status & 0x0004) puts_unfiltered (" DIVZ");
if (status & 0x0008) puts_unfiltered (" OVERF");
if (status & 0x0010) puts_unfiltered (" UNDER");
if (status & 0x0020) puts_unfiltered (" LOS");
if (status & 0x0040) puts_unfiltered (" STACK");
}
}
void
print_387_status_word (status)
unsigned int status;
{
printf_filtered ("status %s:", local_hex_string (status & 0xffff));
print_387_status_bits (status);
puts_unfiltered ("\n");
}
#ifdef LD_I387
int
i387_extract_floating (PTR addr, int len, DOUBLEST *dretptr)
{
if (len == TARGET_LONG_DOUBLE_BIT / 8)
{
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
{
DOUBLEST retval;
memcpy (dretptr, addr, sizeof (retval));
}
else
floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, dretptr);
return 1;
}
else
return 0;
}
int
i387_store_floating (PTR addr, int len, DOUBLEST val)
{
if (len == TARGET_LONG_DOUBLE_BIT / 8)
{
/* This `if' may be totally stupid. I just put it in here to be
absolutely sure I'm preserving the semantics of the code I'm
frobbing, while I try to maintain portability boundaries; I
don't actually know exactly what it's doing. -JimB, May 1999 */
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
memcpy (addr, &val, sizeof (val));
else
floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
return 1;
}
else
return 0;
}
#endif /* LD_I387 */
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