symm-tdep.c   [plain text]

/* Sequent Symmetry target interface, for GDB.
   Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 2000
   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));
    }
}