darling-gdb/gdb/i386b-nat.c

/* Native-dependent code for BSD Unix running on i386's, for GDB.
   Copyright 1988, 1989, 1991, 1992 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 <machine/reg.h>

/* this table must line up with REGISTER_NAMES in tm-i386.h */
/* symbols like 'tEAX' come from <machine/reg.h> */
static int tregmap[] = 
{
  tEAX, tECX, tEDX, tEBX,
  tESP, tEBP, tESI, tEDI,
  tEIP, tEFLAGS, tCS, tSS
};
static int sregmap[] = 
{
  sEAX, sECX, sEDX, sEBX,
  sESP, sEBP, sESI, sEDI,
  sEIP, sEFLAGS, sCS, sSS
};

/* blockend is the value of u.u_ar0, and points to the
   place where ES is stored.  */

int
i386_register_u_addr (blockend, regnum)
     int blockend;
     int regnum;
{
  /* The following condition is a kludge to get at the proper register map
     depending upon the state of pcb_flag.
     The proper condition would be
     if (u.u_pcb.pcb_flag & FM_TRAP)
     but that would require a ptrace call here and wouldn't work
     for corefiles.  */

  if (blockend < 0x1fcc)
    return (blockend + 4 * tregmap[regnum]);
  else
    return (blockend + 4 * sregmap[regnum]);
}