gdb/i387-tdep.c

   1 /* Intel 387 floating point stuff.
   2    Copyright (C) 1988, 1989, 1991, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "language.h"
  24 #include "gdbcore.h"
  25 #include "floatformat.h"
  26
  27 void i387_to_double PARAMS ((char *, char *));
  28
  29 void double_to_i387 PARAMS ((char *, char *));
  30
  31 /* FIXME:  Eliminate these routines when we have the time to change all
  32    the callers.  */
  33
  34 void
  35 i387_to_double (from, to)
  36      char *from;
  37      char *to;
  38 {
  39   floatformat_to_double (&floatformat_i387_ext, from, (double *)to);
  40 }
  41
  42 void
  43 double_to_i387 (from, to)
  44      char *from;
  45      char *to;
  46 {
  47   floatformat_from_double (&floatformat_i387_ext, (double *)from, to);
  48 }
  49
  50 void
  51 print_387_control_word (control)
  52      unsigned int control;
  53 {
  54   printf_unfiltered ("control %s: ", local_hex_string(control));
  55   printf_unfiltered ("compute to ");
  56   switch ((control >> 8) & 3)
  57     {
  58     case 0: printf_unfiltered ("24 bits; "); break;
  59     case 1: printf_unfiltered ("(bad); "); break;
  60     case 2: printf_unfiltered ("53 bits; "); break;
  61     case 3: printf_unfiltered ("64 bits; "); break;
  62     }
  63   printf_unfiltered ("round ");
  64   switch ((control >> 10) & 3)
  65     {
  66     case 0: printf_unfiltered ("NEAREST; "); break;
  67     case 1: printf_unfiltered ("DOWN; "); break;
  68     case 2: printf_unfiltered ("UP; "); break;
  69     case 3: printf_unfiltered ("CHOP; "); break;
  70     }
  71   if (control & 0x3f)
  72     {
  73       printf_unfiltered ("mask:");
  74       if (control & 0x0001) printf_unfiltered (" INVALID");
  75       if (control & 0x0002) printf_unfiltered (" DENORM");
  76       if (control & 0x0004) printf_unfiltered (" DIVZ");
  77       if (control & 0x0008) printf_unfiltered (" OVERF");
  78       if (control & 0x0010) printf_unfiltered (" UNDERF");
  79       if (control & 0x0020) printf_unfiltered (" LOS");
  80       printf_unfiltered (";");
  81     }
  82   printf_unfiltered ("\n");
  83   if (control & 0xe080) warning ("reserved bits on: %s\n",
  84                                 local_hex_string(control & 0xe080));
  85 }
  86
  87 void
  88 print_387_status_word (status)
  89      unsigned int status;
  90 {
  91   printf_unfiltered ("status %s: ", local_hex_string (status));
  92   if (status & 0xff)
  93     {
  94       printf_unfiltered ("exceptions:");
  95       if (status & 0x0001) printf_unfiltered (" INVALID");
  96       if (status & 0x0002) printf_unfiltered (" DENORM");
  97       if (status & 0x0004) printf_unfiltered (" DIVZ");
  98       if (status & 0x0008) printf_unfiltered (" OVERF");
  99       if (status & 0x0010) printf_unfiltered (" UNDERF");
 100       if (status & 0x0020) printf_unfiltered (" LOS");
 101       if (status & 0x0040) printf_unfiltered (" FPSTACK");
 102       printf_unfiltered ("; ");
 103     }
 104   printf_unfiltered ("flags: %d%d%d%d; ",
 105           (status & 0x4000) != 0,
 106           (status & 0x0400) != 0,
 107           (status & 0x0200) != 0,
 108           (status & 0x0100) != 0);
 109
 110   printf_unfiltered ("top %d\n", (status >> 11) & 7);
 111 }