gdb/config/m68k/tm-vx68.h

   1 /* Target machine description for VxWorks m68k's, for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1999 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., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* GCC is probably the only compiler used on this configuration.  So
  23    get this right even if the code which detects gcc2_compiled. is
  24    still broken.  */
  25
  26 #define BELIEVE_PCC_PROMOTION 1
  27
  28 /* We have more complex, useful breakpoints on the target.  */
  29 #define DECR_PC_AFTER_BREAK     0
  30
  31 #include "m68k/tm-m68k.h"
  32 #include "tm-vxworks.h"
  33
  34 /* Takes the current frame-struct pointer and returns the chain-pointer
  35    to get to the calling frame.
  36
  37    If our current frame pointer is zero, we're at the top; else read out
  38    the saved FP from memory pointed to by the current FP.  */
  39
  40 #undef  FRAME_CHAIN
  41 #define FRAME_CHAIN(thisframe) ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)
  42
  43 /* If the chain pointer is zero (either because the saved value fetched
  44    by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
  45    never fetched anything), we are at the top of the stack.  */
  46 /* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
  47
  48 #undef  FRAME_CHAIN_VALID
  49 #define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
  50
  51 /* FIXME, Longjmp information stolen from Sun-3 config.  Dunno if right.  */
  52 /* Offsets (in target ints) into jmp_buf.  Not defined by Sun, but at least
  53    documented in a comment in <machine/setjmp.h>! */
  54
  55 #define JB_ELEMENT_SIZE 4
  56
  57 #define JB_ONSSTACK 0
  58 #define JB_SIGMASK 1
  59 #define JB_SP 2
  60 #define JB_PC 3
  61 #define JB_PSL 4
  62 #define JB_D2 5
  63 #define JB_D3 6
  64 #define JB_D4 7
  65 #define JB_D5 8
  66 #define JB_D6 9
  67 #define JB_D7 10
  68 #define JB_A2 11
  69 #define JB_A3 12
  70 #define JB_A4 13
  71 #define JB_A5 14
  72 #define JB_A6 15
  73
  74 /* Figure out where the longjmp will land.  Slurp the args out of the stack.
  75    We expect the first arg to be a pointer to the jmp_buf structure from which
  76    we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
  77    This routine returns true on success */
  78
  79 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
  80 extern int get_longjmp_target PARAMS ((CORE_ADDR *));
  81
  82 /* Number of registers in a ptrace_getregs call. */
  83
  84 #define VX_NUM_REGS (18)
  85
  86 /* Number of registers in a ptrace_getfpregs call. */
  87
  88 #define VX_SIZE_FPREGS (8 * REGISTER_RAW_SIZE (FP0_REGNUM) \
  89                         + (3 * REGISTER_SIZE))