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