gdb/i386b-nat.c

   1 /* 386BSD host interface.
   2    Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21
  22 #include <machine/reg.h>
  23
  24 \f
  25 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  26 /* symbols like 'tEAX' come from <machine/reg.h> */
  27 static int tregmap[] =
  28 {
  29   tEAX, tECX, tEDX, tEBX,
  30   tESP, tEBP, tESI, tEDI,
  31   tEIP, tEFLAGS, tCS, tSS
  32 };
  33 static int sregmap[] =
  34 {
  35   sEAX, sECX, sEDX, sEBX,
  36   sESP, sEBP, sESI, sEDI,
  37   sEIP, sEFLAGS, sCS, sSS
  38 };
  39
  40 /* blockend is the value of u.u_ar0, and points to the
  41    place where ES is stored.  */
  42
  43 int
  44 i386_register_u_addr (blockend, regnum)
  45      int blockend;
  46      int regnum;
  47 {
  48   /* The following condition is a kludge to get at the proper register map
  49      depending upon the state of pcb_flag.
  50      The proper condition would be
  51      if (u.u_pcb.pcb_flag & FM_TRAP)
  52      but that would require a ptrace call here and wouldn't work
  53      for corefiles.  */
  54
  55   if (blockend < 0x1fcc)
  56     return (blockend + 4 * tregmap[regnum]);
  57   else
  58     return (blockend + 4 * sregmap[regnum]);
  59 }