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.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* GCC is probably the only compiler used on this configuration. So
22 get this right even if the code which detects gcc2_compiled. is
25 #define BELIEVE_PCC_PROMOTION 1
27 /* We have more complex, useful breakpoints on the target. */
28 #define DECR_PC_AFTER_BREAK 0
30 #include "m68k/tm-m68k.h"
31 #include "tm-vxworks.h"
33 /* Takes the current frame-struct pointer and returns the chain-pointer
34 to get to the calling frame.
36 If our current frame pointer is zero, we're at the top; else read out
37 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. */
45 /* We are guaranteed to have a zero frame pointer at bottom of stack, too. */
47 #undef FRAME_CHAIN_VALID
48 #define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
50 /* FIXME, Longjmp information stolen from Sun-3 config. Dunno if right. */
51 /* Offsets (in target ints) into jmp_buf. Not defined by Sun, but at least
52 documented in a comment in <machine/setjmp.h>! */
54 #define JB_ELEMENT_SIZE 4
73 /* Figure out where the longjmp will land. Slurp the args out of the stack.
74 We expect the first arg to be a pointer to the jmp_buf structure from which
75 we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
76 This routine returns true on success */
78 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
79 extern int get_longjmp_target
PARAMS ((CORE_ADDR
*));
81 /* Number of registers in a ptrace_getregs call. */
83 #define VX_NUM_REGS (18)
85 /* Number of registers in a ptrace_getfpregs call. */
87 #define VX_SIZE_FPREGS (8 * REGISTER_RAW_SIZE (FP0_REGNUM) \
88 + (3 * REGISTER_SIZE))
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