gdb/config/m68k/tm-m68kv4.h

   1 /* Target definitions for GDB on a Motorola 680x0 running SVR4.
   2    (Commodore Amiga with amix or Atari TT with ASV)
   3    Copyright (C) 1991, Free Software Foundation, Inc.
   4    Written by Fred Fish at Cygnus Support (fnf@cygint)
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 /* Define BPT_VECTOR if it is different than the default.
  23    This is the vector number used by traps to indicate a breakpoint. */
  24
  25 #define BPT_VECTOR 0x1
  26
  27 /* How much to decrement the PC after a trap.  Depends on kernel. */
  28
  29 #define DECR_PC_AFTER_BREAK 0           /* No decrement required */
  30
  31 /* Use the alternate method of determining valid frame chains. */
  32
  33 #define FRAME_CHAIN_VALID_ALTERNATE
  34
  35 #include "tm-sysv4.h"
  36 #include "m68k/tm-m68k.h"
  37
  38 /* Offsets (in target ints) into jmp_buf.  Not defined in any system header
  39    file, so we have to step through setjmp/longjmp with a debugger and figure
  40    them out.  As a double check, note that <setjmp> defines _JBLEN as 13,
  41    which matches the number of elements we see saved by setjmp(). */
  42
  43 #define JB_ELEMENT_SIZE sizeof(int)     /* jmp_buf[_JBLEN] is array of ints */
  44
  45 #define JB_D2   0
  46 #define JB_D3   1
  47 #define JB_D4   2
  48 #define JB_D5   3
  49 #define JB_D6   4
  50 #define JB_D7   5
  51 #define JB_A1   6
  52 #define JB_A2   7
  53 #define JB_A3   8
  54 #define JB_A4   9
  55 #define JB_A5   10
  56 #define JB_A6   11
  57 #define JB_A7   12
  58
  59 #define JB_PC   JB_A1   /* Setjmp()'s return PC saved in A1 */
  60
  61 /* Figure out where the longjmp will land.  Slurp the args out of the stack.
  62    We expect the first arg to be a pointer to the jmp_buf structure from which
  63    we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
  64    This routine returns true on success */
  65
  66 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)