gdb/tm-vx68.h

   1 /* Target machine description for VxWorks 68k's, for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #define GDBINIT_FILENAME        ".vxgdbinit"
  22
  23 #define DEFAULT_PROMPT          "(vxgdb) "
  24
  25 /* Kludge... */
  26 #include "tm-sun3.h"
  27
  28 /* Define this if the C compiler puts an underscore at the front
  29    of external names before giving them to the linker.  */
  30
  31 #define NAMES_HAVE_UNDERSCORE
  32
  33 #undef SAVED_PC_AFTER_CALL
  34 #define SAVED_PC_AFTER_CALL(frame) \
  35         read_memory_integer (read_register (SP_REGNUM), 4)
  36
  37 /* We have more complex, useful breakpoints on the target.  */
  38 #undef DECR_PC_AFTER_BREAK
  39 #define DECR_PC_AFTER_BREAK     0
  40
  41 /* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
  42 #undef  FRAME_CHAIN
  43 #undef  FRAME_CHAIN_VALID
  44
  45 /* Takes the current frame-struct pointer and returns the chain-pointer
  46    to get to the calling frame.
  47
  48    If our current frame pointer is zero, we're at the top; else read out
  49    the saved FP from memory pointed to by the current FP.  */
  50
  51 #define FRAME_CHAIN(thisframe) ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)
  52
  53 /* If the chain pointer is zero (either because the saved value fetched
  54    by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
  55    never fetched anything), we are at the top of the stack.  */
  56
  57 #define FRAME_CHAIN_VALID(chain, thisframe) (chain != 0)