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