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binutils-gdb/gdb/i387-tdep.c

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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 (";");
}
printf_unfiltered ("\n");
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");
}
void
i387_print_register (raw_regs, regnum)
char *raw_regs;
int regnum;
{
unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
unsigned long val;
int j, sign, special;
unsigned swd, tags, expon, top, norm, ls, ms;
char string[12];
#if (FPREG_RAW_SIZE != 10)
#error "Bad FPREG_RAW_SIZE"
#endif
printf_filtered ("%8.8s: ", REGISTER_NAME (regnum));
if (regnum < FPDATA_REGNUM)
{
val = extract_unsigned_integer (raw_regs + REGISTER_BYTE (regnum), 4);
if ( (regnum < FPSTART_REGNUM + 3) ||
(regnum == FPSTART_REGNUM + 6) )
/* Don't print the un-modifiable bytes. */
sprintf(string, "0x%04x", val & 0xffff);
else
sprintf(string, "0x%08x", val);
printf_unfiltered ("%10.10s", string);
if (regnum == FPCONTROL_REGNUM)
print_387_control_bits (val);
else if (regnum == FPSTATUS_REGNUM)
print_387_status_bits (val);
}
else
{
/* An FPU stack register. */
if ( REGISTER_RAW_SIZE (regnum) != FPREG_RAW_SIZE )
error ("GDB bug: i387-tdep.c (i387_print_register): wrong size for FPU stack register");
/* Put the data in the buffer. No conversions are ever necessary. */
memcpy (virtual_buffer, raw_regs + REGISTER_BYTE (regnum),
FPREG_RAW_SIZE);
swd = extract_signed_integer (raw_regs + REGISTER_BYTE (FPSTATUS_REGNUM),
4);
top = (swd >> 11) & 7;
tags = extract_signed_integer (raw_regs + REGISTER_BYTE (FPTAG_REGNUM),
4);
puts_unfiltered ("0x");
for (j = 0; j < FPREG_RAW_SIZE; j++)
printf_unfiltered ("%02x",
(unsigned char)raw_regs[REGISTER_BYTE (regnum)
+ FPREG_RAW_SIZE - 1 - j]);
puts_unfiltered (" ");
special = 0;
switch ((tags >> (((regnum - FPDATA_REGNUM + top) & 7) * 2)) & 3)
{
case 0: puts_unfiltered ("Valid "); break;
case 1: puts_unfiltered ("Zero "); break;
case 2: puts_unfiltered ("Spec ");
special = 1;
break;
case 3: puts_unfiltered ("Empty "); break;
}
expon = extract_unsigned_integer (raw_regs + REGISTER_BYTE (regnum)
+ FPREG_RAW_SIZE - 2, 2);
sign = expon & 0x8000;
expon &= 0x7fff;
ms = extract_unsigned_integer (raw_regs + REGISTER_BYTE (regnum) + 4, 4);
ls = extract_signed_integer (raw_regs + REGISTER_BYTE (regnum), 4);
norm = ms & 0x80000000;
if ( expon == 0 )
{
if ( ms | ls )
{
/* Denormal or Pseudodenormal. */
if ( norm )
puts_unfiltered ("Pseudo ");
else
puts_unfiltered ("Denorm ");
}
else
{
/* Zero. */
puts_unfiltered ("Zero ");
}
}
else if ( expon == 0x7fff )
{
/* Infinity, NaN or unsupported. */
if ( (ms == 0x80000000) &&
(ls == 0) )
{
puts_unfiltered ("Infty ");
}
else if ( norm )
{
if ( ms & 0x40000000 )
puts_unfiltered ("QNaN ");
else
puts_unfiltered ("SNaN ");
}
else
{
puts_unfiltered ("Unsupp ");
}
}
else
{
/* Normal or unsupported. */
if ( norm )
puts_unfiltered ("Normal ");
else
puts_unfiltered ("Unsupp ");
}
val_print (REGISTER_VIRTUAL_TYPE (regnum), virtual_buffer, 0, 0,
gdb_stdout, 0,
1, 0, Val_pretty_default);
}
puts_filtered ("\n");
}
void i387_float_info(void)
{
char raw_regs [REGISTER_BYTES];
int i;
for (i = FPSTART_REGNUM; i <= FPEND_REGNUM; i++)
read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i));
for (i = FPSTART_REGNUM; i <= FPEND_REGNUM; i++)
i387_print_register (raw_regs, i);
}
#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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