1 /* Simulate breakpoints by patching locations in the target system, for GDB.
2 Copyright 1990, 1991 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by John Gilmore.
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. */
24 /* This file is only useful if BREAKPOINT is set. If not, we punt. */
27 #include "breakpoint.h"
31 /* This is the sequence of bytes we insert for a breakpoint. On some
32 machines, breakpoints are handled by the target environment and we
33 don't have to worry about them here. */
35 static char break_insn
[] = BREAKPOINT
;
37 /* This is only to check that BREAKPOINT fits in BREAKPOINT_MAX bytes. */
39 static char check_break_insn_size
[BREAKPOINT_MAX
] = BREAKPOINT
;
41 /* Insert a breakpoint on machines that don't have any better breakpoint
42 support. We read the contents of the target location and stash it,
43 then overwrite it with a breakpoint instruction. ADDR is the target
44 location in the target machine. CONTENTS_CACHE is a pointer to
45 memory allocated for saving the target contents. It is guaranteed
46 by the caller to be long enough to save sizeof BREAKPOINT bytes.
47 FIXME: This size is target_arch dependent and should be available in
48 the target_arch transfer vector, if we ever have one... */
51 memory_insert_breakpoint (addr
, contents_cache
)
57 val
= target_read_memory (addr
, contents_cache
, sizeof break_insn
);
60 val
= target_write_memory (addr
, break_insn
, sizeof break_insn
);
67 memory_remove_breakpoint (addr
, contents_cache
)
71 return target_write_memory (addr
, contents_cache
, sizeof break_insn
);
75 int memory_breakpoint_size
= sizeof (break_insn
);
78 #else /* BREAKPOINT */
80 char nogo
[] = "Breakpoints not implemented for this target.";
83 memory_insert_breakpoint (addr
, contents_cache
)
92 memory_remove_breakpoint (addr
, contents_cache
)
100 int memory_breakpoint_size
= -1;
102 #endif /* BREAKPOINT */
This page took 0.030769 seconds and 4 git commands to generate.