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 "ieee-float.h"
  26
  27 #ifdef USG
  28 #include <sys/types.h>
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/dir.h>
  33 #include <signal.h>
  34 #include <sys/user.h>
  35 #include <sys/ioctl.h>
  36 #include <fcntl.h>
  37
  38 #include <sys/file.h>
  39 #include <sys/stat.h>
  40
  41 #include <sys/reg.h>
  42
  43 struct ext_format ext_format_i387 = {
  44 /* tot sbyte smask expbyte      manbyte */
  45    10, 9,    0x80, 9,8,         4,0             /* i387 */
  46 };
  47
  48 /* FIXME:  Eliminate these routines when we have the time to change all
  49    the callers.  */
  50
  51 void
  52 i387_to_double (from, to)
  53      char *from;
  54      char *to;
  55 {
  56   ieee_extended_to_double (&ext_format_i387, from, (double *)to);
  57 }
  58
  59 void
  60 double_to_i387 (from, to)
  61      char *from;
  62      char *to;
  63 {
  64   double_to_ieee_extended (&ext_format_i387, (double *)from, to);
  65 }
  66
  67 void
  68 print_387_control_word (control)
  69      unsigned int control;
  70 {
  71   printf ("control %s: ", local_hex_string(control));
  72   printf ("compute to ");
  73   switch ((control >> 8) & 3)
  74     {
  75     case 0: printf ("24 bits; "); break;
  76     case 1: printf ("(bad); "); break;
  77     case 2: printf ("53 bits; "); break;
  78     case 3: printf ("64 bits; "); break;
  79     }
  80   printf ("round ");
  81   switch ((control >> 10) & 3)
  82     {
  83     case 0: printf ("NEAREST; "); break;
  84     case 1: printf ("DOWN; "); break;
  85     case 2: printf ("UP; "); break;
  86     case 3: printf ("CHOP; "); break;
  87     }
  88   if (control & 0x3f)
  89     {
  90       printf ("mask:");
  91       if (control & 0x0001) printf (" INVALID");
  92       if (control & 0x0002) printf (" DENORM");
  93       if (control & 0x0004) printf (" DIVZ");
  94       if (control & 0x0008) printf (" OVERF");
  95       if (control & 0x0010) printf (" UNDERF");
  96       if (control & 0x0020) printf (" LOS");
  97       printf (";");
  98     }
  99   printf ("\n");
 100   if (control & 0xe080) printf ("warning: reserved bits on: %s\n",
 101                                 local_hex_string(control & 0xe080));
 102 }
 103
 104 void
 105 print_387_status_word (status)
 106      unsigned int status;
 107 {
 108   printf ("status %s: ", local_hex_string (status));
 109   if (status & 0xff)
 110     {
 111       printf ("exceptions:");
 112       if (status & 0x0001) printf (" INVALID");
 113       if (status & 0x0002) printf (" DENORM");
 114       if (status & 0x0004) printf (" DIVZ");
 115       if (status & 0x0008) printf (" OVERF");
 116       if (status & 0x0010) printf (" UNDERF");
 117       if (status & 0x0020) printf (" LOS");
 118       if (status & 0x0040) printf (" FPSTACK");
 119       printf ("; ");
 120     }
 121   printf ("flags: %d%d%d%d; ",
 122           (status & 0x4000) != 0,
 123           (status & 0x0400) != 0,
 124           (status & 0x0200) != 0,
 125           (status & 0x0100) != 0);
 126
 127   printf ("top %d\n", (status >> 11) & 7);
 128 }