gdb/symm-tdep.c

   1 /* Sequent Symmetry target interface, for GDB.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* many 387-specific items of use taken from i386-dep.c */
  23
  24 #include "defs.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "symtab.h"
  28
  29 #include <signal.h>
  30 #include <sys/param.h>
  31 #include <sys/user.h>
  32 #include <sys/dir.h>
  33 #include <sys/ioctl.h>
  34 #include "gdb_stat.h"
  35 #include "gdbcore.h"
  36 #include <fcntl.h>
  37
  38 void
  39 symmetry_extract_return_value (struct type *type, char *regbuf, char *valbuf)
  40 {
  41   union
  42     {
  43       double d;
  44       int l[2];
  45     }
  46   xd;
  47   struct minimal_symbol *msymbol;
  48   float f;
  49
  50   if (TYPE_CODE_FLT == TYPE_CODE (type))
  51     {
  52       msymbol = lookup_minimal_symbol ("1167_flt", NULL, NULL);
  53       if (msymbol != NULL)
  54         {
  55           /* found "1167_flt" means 1167, %fp2-%fp3 */
  56           /* float & double; 19= %fp2, 20= %fp3 */
  57           /* no single precision on 1167 */
  58           xd.l[1] = *((int *) &regbuf[REGISTER_BYTE (19)]);
  59           xd.l[0] = *((int *) &regbuf[REGISTER_BYTE (20)]);
  60           switch (TYPE_LENGTH (type))
  61             {
  62             case 4:
  63               /* FIXME: broken for cross-debugging.  */
  64               f = (float) xd.d;
  65               memcpy (valbuf, &f, TYPE_LENGTH (type));
  66               break;
  67             case 8:
  68               /* FIXME: broken for cross-debugging.  */
  69               memcpy (valbuf, &xd.d, TYPE_LENGTH (type));
  70               break;
  71             default:
  72               error ("Unknown floating point size");
  73               break;
  74             }
  75         }
  76       else
  77         {
  78           /* 387 %st(0), gcc uses this */
  79           i387_to_double (((int *) &regbuf[REGISTER_BYTE (3)]),
  80                           &xd.d);
  81           switch (TYPE_LENGTH (type))
  82             {
  83             case 4:             /* float */
  84               f = (float) xd.d;
  85               /* FIXME: broken for cross-debugging.  */
  86               memcpy (valbuf, &f, 4);
  87               break;
  88             case 8:             /* double */
  89               /* FIXME: broken for cross-debugging.  */
  90               memcpy (valbuf, &xd.d, 8);
  91               break;
  92             default:
  93               error ("Unknown floating point size");
  94               break;
  95             }
  96         }
  97     }
  98   else
  99     {
 100       memcpy (valbuf, regbuf, TYPE_LENGTH (type));
 101     }
 102 }