1 /* Target machine description for VxWorks m68k's, for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
5 This file is part of GDB.
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.
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.
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. */
21 #define GDBINIT_FILENAME ".vxgdbinit"
23 #define DEFAULT_PROMPT "(vxgdb) "
25 /* We have more complex, useful breakpoints on the target. */
26 #define DECR_PC_AFTER_BREAK 0
28 #include "m68k/tm-m68k.h"
30 /* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
32 #undef FRAME_CHAIN_VALID
34 /* Takes the current frame-struct pointer and returns the chain-pointer
35 to get to the calling frame.
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. */
40 #define FRAME_CHAIN(thisframe) ((thisframe)->frame? read_memory_integer ((thisframe)->frame, 4): 0)
42 /* If the chain pointer is zero (either because the saved value fetched
43 by FRAME_CHAIN was zero, or because the current FP was zero so FRAME_CHAIN
44 never fetched anything), we are at the top of the stack. */
46 #define FRAME_CHAIN_VALID(chain, thisframe) (chain != 0)
48 /* FIXME, Longjmp information stolen from Sun-3 config. Dunno if right. */
49 /* Offsets (in target ints) into jmp_buf. Not defined by Sun, but at least
50 documented in a comment in <machine/setjmp.h>! */
52 #define JB_ELEMENT_SIZE 4
71 /* Figure out where the longjmp will land. Slurp the args out of the stack.
72 We expect the first arg to be a pointer to the jmp_buf structure from which
73 we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
74 This routine returns true on success */
76 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
78 /* Number of registers in a ptrace_getregs call. */
80 #define VX_NUM_REGS (18)
82 /* Number of registers in a ptrace_getfpregs call. */
84 #define VX_SIZE_FPREGS (8 * REGISTER_RAW_SIZE (FP0_REGNUM) \
85 + (3 * sizeof (REGISTER_TYPE)))
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