gdb/i386b-nat.c

   1 /* Native-dependent code for BSD Unix running on i386's, for GDB.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1995, 1996, 1998, 1999, 2000,
   3    2001 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23
  24 #include <machine/reg.h>
  25
  26 /* This table must line up with REGISTER_NAME in "i386-tdep.c".  */
  27 /* symbols like 'tEAX' come from <machine/reg.h> */
  28 static int tregmap[] =
  29 {
  30   tEAX, tECX, tEDX, tEBX,
  31   tESP, tEBP, tESI, tEDI,
  32   tEIP, tEFLAGS, tCS, tSS
  33 };
  34
  35 #ifdef sEAX
  36 static int sregmap[] =
  37 {
  38   sEAX, sECX, sEDX, sEBX,
  39   sESP, sEBP, sESI, sEDI,
  40   sEIP, sEFLAGS, sCS, sSS
  41 };
  42 #else /* No sEAX */
  43
  44 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
  45    ones aren't around, use the t* ones for sregmap too.  */
  46
  47 static int sregmap[] =
  48 {
  49   tEAX, tECX, tEDX, tEBX,
  50   tESP, tEBP, tESI, tEDI,
  51   tEIP, tEFLAGS, tCS, tSS
  52 };
  53 #endif /* No sEAX */
  54
  55 /* blockend is the value of u.u_ar0, and points to the
  56    place where ES is stored.  */
  57
  58 int
  59 i386_register_u_addr (int blockend, int regnum)
  60 {
  61   /* The following condition is a kludge to get at the proper register map
  62      depending upon the state of pcb_flag.
  63      The proper condition would be
  64      if (u.u_pcb.pcb_flag & FM_TRAP)
  65      but that would require a ptrace call here and wouldn't work
  66      for corefiles.  */
  67
  68   if (blockend < 0x1fcc)
  69     return (blockend + 4 * tregmap[regnum]);
  70   else
  71     return (blockend + 4 * sregmap[regnum]);
  72 }