gdb/i386b-nat.c

   1 /* Native-dependent code for BSD Unix running on i386's, for GDB.
   2    Copyright 1988, 1989, 1991, 1992 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 #include <machine/reg.h>
  22
  23 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  24 /* symbols like 'tEAX' come from <machine/reg.h> */
  25 static int tregmap[] =
  26 {
  27   tEAX, tECX, tEDX, tEBX,
  28   tESP, tEBP, tESI, tEDI,
  29   tEIP, tEFLAGS, tCS, tSS
  30 };
  31
  32 #ifdef sEAX
  33 static int sregmap[] =
  34 {
  35   sEAX, sECX, sEDX, sEBX,
  36   sESP, sEBP, sESI, sEDI,
  37   sEIP, sEFLAGS, sCS, sSS
  38 };
  39 #else /* No sEAX */
  40
  41 /* NetBSD has decided to collapse the s* and t* symbols.  So if the s*
  42    ones aren't around, use the t* ones for sregmap too.  */
  43
  44 static int sregmap[] =
  45 {
  46   tEAX, tECX, tEDX, tEBX,
  47   tESP, tEBP, tESI, tEDI,
  48   tEIP, tEFLAGS, tCS, tSS
  49 };
  50 #endif /* No sEAX */
  51
  52 /* blockend is the value of u.u_ar0, and points to the
  53    place where ES is stored.  */
  54
  55 int
  56 i386_register_u_addr (blockend, regnum)
  57      int blockend;
  58      int regnum;
  59 {
  60   /* The following condition is a kludge to get at the proper register map
  61      depending upon the state of pcb_flag.
  62      The proper condition would be
  63      if (u.u_pcb.pcb_flag & FM_TRAP)
  64      but that would require a ptrace call here and wouldn't work
  65      for corefiles.  */
  66
  67   if (blockend < 0x1fcc)
  68     return (blockend + 4 * tregmap[regnum]);
  69   else
  70     return (blockend + 4 * sregmap[regnum]);
  71 }