1 /* Simulate breakpoints by patching locations in the target system, for GDB.
3 Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000,
4 2002 Free Software Foundation, Inc.
6 Contributed by Cygnus Support. Written by John Gilmore.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
27 /* This file is only useful if BREAKPOINT_FROM_PC is set. If not, we
31 #include "breakpoint.h"
36 /* Insert a breakpoint on targets that don't have any better
37 breakpoint support. We read the contents of the target location
38 and stash it, then overwrite it with a breakpoint instruction.
39 BP_TGT->placed_address is the target location in the target
40 machine. BP_TGT->shadow_contents is some memory allocated for
41 saving the target contents. It is guaranteed by the caller to be
42 long enough to save BREAKPOINT_LEN bytes (this is accomplished via
46 default_memory_insert_breakpoint (struct bp_target_info
*bp_tgt
)
49 const unsigned char *bp
;
52 /* Determine appropriate breakpoint contents and size for this address. */
53 bp
= BREAKPOINT_FROM_PC (&bp_tgt
->placed_address
, &bp_tgt
->placed_size
);
55 error (_("Software breakpoints not implemented for this target."));
57 /* Save the memory contents. */
58 bp_tgt
->shadow_len
= bp_tgt
->placed_size
;
59 val
= target_read_memory (bp_tgt
->placed_address
, bp_tgt
->shadow_contents
,
62 /* Write the breakpoint. */
64 val
= target_write_memory (bp_tgt
->placed_address
, bp
,
72 default_memory_remove_breakpoint (struct bp_target_info
*bp_tgt
)
74 return target_write_memory (bp_tgt
->placed_address
, bp_tgt
->shadow_contents
,
80 memory_insert_breakpoint (struct bp_target_info
*bp_tgt
)
82 return MEMORY_INSERT_BREAKPOINT (bp_tgt
);
86 memory_remove_breakpoint (struct bp_target_info
*bp_tgt
)
88 return MEMORY_REMOVE_BREAKPOINT (bp_tgt
);
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