/* Functions specific to running gdb native on a Motorola Delta Series sysV68.
   Copyright (C) 1993, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include <sys/signal.h>	/* for MAXSIG in sys/user.h */
#include <sys/types.h>	/* for ushort in sys/dir.h */
#include <sys/dir.h>	/* for struct direct in sys/user.h */
#include <sys/user.h>

#include <nlist.h>

#if !defined (offsetof)
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif

/* Return the address in the core dump or inferior of register REGNO.
   BLOCKEND is the address of the end of the user structure.  */

unsigned int
register_addr (regno, blockend)
     int	regno;
     int	blockend;
{
  static int	sysv68reg[] =
    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, -1, 15, 16 };

  if (regno >= 0 && regno < sizeof(sysv68reg) / sizeof(sysv68reg[0]))
    return blockend + sysv68reg[regno] * 4; 
  else if (regno < FPC_REGNUM)
    return offsetof (struct user, u_fpu.regs.reg[regno - FP0_REGNUM][0]);
  else if (regno == FPC_REGNUM)
    return offsetof (struct user, u_fpu.regs.control);
  else if (regno == FPS_REGNUM)
    return offsetof (struct user, u_fpu.regs.status);
  else if (regno == FPI_REGNUM)
    return offsetof (struct user, u_fpu.regs.iaddr);
  else
    {
      fprintf_unfiltered (gdb_stderr, "\
Internal error: invalid register number %d in REGISTER_U_ADDR\n",
	       regno);
      return blockend;
    }
}

CORE_ADDR kernel_u_addr;

/* Read the value of the u area from the kernel.  */
void
_initialize_delta68_nat ()
{
  struct nlist nl[2];

  nl[0].n_name = "u";
  nl[1].n_name = NULL;
  if (nlist ("/sysV68", nl) == 0 && nl[0].n_scnum != 0)
    kernel_u_addr = nl[0].n_value;
  else
    {
      perror ("Cannot get kernel u area address");
      exit (1);
    }
}
