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 #define HAVE_68881
  26
  27 /* We have more complex, useful breakpoints on the target.  */
  28 #define DECR_PC_AFTER_BREAK     0
  29
  30 #include "tm-68k.h"
  31
  32 /* Define this if the C compiler puts an underscore at the front
  33    of external names before giving them to the linker.  */
  34
  35 #define NAMES_HAVE_UNDERSCORE
  36
  37 /* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
  38 #undef  FRAME_CHAIN
  39 #undef  FRAME_CHAIN_VALID
  40
  41 /* Takes the current frame-struct pointer and returns the chain-pointer
  42    to get to the calling frame.
  43
  44    If our current frame pointer is zero, we're at the top; else read out
  45    the saved FP from memory pointed to by the current FP.  */
  46
  47 #define FRAME_CHAIN(thisframe) ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)
  48
  49 /* If the chain pointer is zero (either because the saved value fetched
  50    by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
  51    never fetched anything), we are at the top of the stack.  */
  52
  53 #define FRAME_CHAIN_VALID(chain, thisframe) (chain != 0)
  54
  55 /* FIXME, Longjmp information stolen from Sun-3 config.  Dunno if right.  */
  56 /* Offsets (in target ints) into jmp_buf.  Not defined by Sun, but at least
  57    documented in a comment in <machine/setjmp.h>! */
  58
  59 #define JB_ELEMENT_SIZE 4
  60
  61 #define JB_ONSSTACK 0
  62 #define JB_SIGMASK 1
  63 #define JB_SP 2
  64 #define JB_PC 3
  65 #define JB_PSL 4
  66 #define JB_D2 5
  67 #define JB_D3 6
  68 #define JB_D4 7
  69 #define JB_D5 8
  70 #define JB_D6 9
  71 #define JB_D7 10
  72 #define JB_A2 11
  73 #define JB_A3 12
  74 #define JB_A4 13
  75 #define JB_A5 14
  76 #define JB_A6 15
  77
  78 /* Figure out where the longjmp will land.  Slurp the args out of the stack.
  79    We expect the first arg to be a pointer to the jmp_buf structure from which
  80    we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
  81    This routine returns true on success */
  82
  83 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)