gdb/i387-tdep.c

   1 /* Intel 387 floating point stuff.
   2    Copyright (C) 1988, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, 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 /* FIXME:  Eliminate these routines when we have the time to change all
  28    the callers.  */
  29
  30 void
  31 i387_to_double (from, to)
  32      char *from;
  33      char *to;
  34 {
  35   floatformat_to_double (&floatformat_i387_ext, from, (double *)to);
  36 }
  37
  38 void
  39 double_to_i387 (from, to)
  40      char *from;
  41      char *to;
  42 {
  43   floatformat_from_double (&floatformat_i387_ext, (double *)from, to);
  44 }
  45
  46 void
  47 print_387_control_word (control)
  48      unsigned int control;
  49 {
  50   printf_unfiltered ("control %s: ", local_hex_string(control));
  51   printf_unfiltered ("compute to ");
  52   switch ((control >> 8) & 3)
  53     {
  54     case 0: printf_unfiltered ("24 bits; "); break;
  55     case 1: printf_unfiltered ("(bad); "); break;
  56     case 2: printf_unfiltered ("53 bits; "); break;
  57     case 3: printf_unfiltered ("64 bits; "); break;
  58     }
  59   printf_unfiltered ("round ");
  60   switch ((control >> 10) & 3)
  61     {
  62     case 0: printf_unfiltered ("NEAREST; "); break;
  63     case 1: printf_unfiltered ("DOWN; "); break;
  64     case 2: printf_unfiltered ("UP; "); break;
  65     case 3: printf_unfiltered ("CHOP; "); break;
  66     }
  67   if (control & 0x3f)
  68     {
  69       printf_unfiltered ("mask:");
  70       if (control & 0x0001) printf_unfiltered (" INVALID");
  71       if (control & 0x0002) printf_unfiltered (" DENORM");
  72       if (control & 0x0004) printf_unfiltered (" DIVZ");
  73       if (control & 0x0008) printf_unfiltered (" OVERF");
  74       if (control & 0x0010) printf_unfiltered (" UNDERF");
  75       if (control & 0x0020) printf_unfiltered (" LOS");
  76       printf_unfiltered (";");
  77     }
  78   printf_unfiltered ("\n");
  79   if (control & 0xe080) warning ("reserved bits on: %s\n",
  80                                 local_hex_string(control & 0xe080));
  81 }
  82
  83 void
  84 print_387_status_word (status)
  85      unsigned int status;
  86 {
  87   printf_unfiltered ("status %s: ", local_hex_string (status));
  88   if (status & 0xff)
  89     {
  90       printf_unfiltered ("exceptions:");
  91       if (status & 0x0001) printf_unfiltered (" INVALID");
  92       if (status & 0x0002) printf_unfiltered (" DENORM");
  93       if (status & 0x0004) printf_unfiltered (" DIVZ");
  94       if (status & 0x0008) printf_unfiltered (" OVERF");
  95       if (status & 0x0010) printf_unfiltered (" UNDERF");
  96       if (status & 0x0020) printf_unfiltered (" LOS");
  97       if (status & 0x0040) printf_unfiltered (" FPSTACK");
  98       printf_unfiltered ("; ");
  99     }
 100   printf_unfiltered ("flags: %d%d%d%d; ",
 101           (status & 0x4000) != 0,
 102           (status & 0x0400) != 0,
 103           (status & 0x0200) != 0,
 104           (status & 0x0100) != 0);
 105
 106   printf_unfiltered ("top %d\n", (status >> 11) & 7);
 107 }