symm-tdep.c   [plain text]

/* Sequent Symmetry target interface, for GDB.
   Copyright (C) 1986, 1987, 1989, 1991, 1994 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* many 387-specific items of use taken from i386-dep.c */

#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "symtab.h"

#include <signal.h>
#include <sys/param.h>
#include <sys/user.h>
#include <sys/dir.h>
#include <sys/ioctl.h>
#include "gdb_stat.h"
#include "gdbcore.h"
#include <fcntl.h>

void
symmetry_extract_return_value (struct type *type, char *regbuf, char *valbuf)
{
  union
    {
      double d;
      int l[2];
    }
  xd;
  struct minimal_symbol *msymbol;
  float f;

  if (TYPE_CODE_FLT == TYPE_CODE (type))
    {
      msymbol = lookup_minimal_symbol ("1167_flt", NULL, NULL);
      if (msymbol != NULL)
	{
	  /* found "1167_flt" means 1167, %fp2-%fp3 */
	  /* float & double; 19= %fp2, 20= %fp3 */
	  /* no single precision on 1167 */
	  xd.l[1] = *((int *) &regbuf[REGISTER_BYTE (19)]);
	  xd.l[0] = *((int *) &regbuf[REGISTER_BYTE (20)]);
	  switch (TYPE_LENGTH (type))
	    {
	    case 4:
	      /* FIXME: broken for cross-debugging.  */
	      f = (float) xd.d;
	      memcpy (valbuf, &f, TYPE_LENGTH (type));
	      break;
	    case 8:
	      /* FIXME: broken for cross-debugging.  */
	      memcpy (valbuf, &xd.d, TYPE_LENGTH (type));
	      break;
	    default:
	      error ("Unknown floating point size");
	      break;
	    }
	}
      else
	{
	  /* 387 %st(0), gcc uses this */
	  i387_to_double (((int *) &regbuf[REGISTER_BYTE (3)]),
			  &xd.d);
	  switch (TYPE_LENGTH (type))
	    {
	    case 4:		/* float */
	      f = (float) xd.d;
	      /* FIXME: broken for cross-debugging.  */
	      memcpy (valbuf, &f, 4);
	      break;
	    case 8:		/* double */
	      /* FIXME: broken for cross-debugging.  */
	      memcpy (valbuf, &xd.d, 8);
	      break;
	    default:
	      error ("Unknown floating point size");
	      break;
	    }
	}
    }
  else
    {
      memcpy (valbuf, regbuf, TYPE_LENGTH (type));
    }
}