| 1 |
24 |
jeremybenn |
/* Simulate breakpoints by patching locations in the target system, for GDB.
|
| 2 |
|
|
|
| 3 |
|
|
Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000, 2002,
|
| 4 |
|
|
2007, 2008 Free Software Foundation, Inc.
|
| 5 |
|
|
|
| 6 |
|
|
Contributed by Cygnus Support. Written by John Gilmore.
|
| 7 |
|
|
|
| 8 |
|
|
This file is part of GDB.
|
| 9 |
|
|
|
| 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 3 of the License, or
|
| 13 |
|
|
(at your option) any later version.
|
| 14 |
|
|
|
| 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.
|
| 19 |
|
|
|
| 20 |
|
|
You should have received a copy of the GNU General Public License
|
| 21 |
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
| 22 |
|
|
|
| 23 |
|
|
#include "defs.h"
|
| 24 |
|
|
|
| 25 |
|
|
/* This file is only useful if BREAKPOINT_FROM_PC is set. If not, we
|
| 26 |
|
|
punt. */
|
| 27 |
|
|
|
| 28 |
|
|
#include "symtab.h"
|
| 29 |
|
|
#include "breakpoint.h"
|
| 30 |
|
|
#include "inferior.h"
|
| 31 |
|
|
#include "target.h"
|
| 32 |
|
|
|
| 33 |
|
|
|
| 34 |
|
|
/* Insert a breakpoint on targets that don't have any better
|
| 35 |
|
|
breakpoint support. We read the contents of the target location
|
| 36 |
|
|
and stash it, then overwrite it with a breakpoint instruction.
|
| 37 |
|
|
BP_TGT->placed_address is the target location in the target
|
| 38 |
|
|
machine. BP_TGT->shadow_contents is some memory allocated for
|
| 39 |
|
|
saving the target contents. It is guaranteed by the caller to be
|
| 40 |
|
|
long enough to save BREAKPOINT_LEN bytes (this is accomplished via
|
| 41 |
|
|
BREAKPOINT_MAX). */
|
| 42 |
|
|
|
| 43 |
|
|
int
|
| 44 |
|
|
default_memory_insert_breakpoint (struct gdbarch *gdbarch,
|
| 45 |
|
|
struct bp_target_info *bp_tgt)
|
| 46 |
|
|
{
|
| 47 |
|
|
int val;
|
| 48 |
|
|
const unsigned char *bp;
|
| 49 |
|
|
int bplen;
|
| 50 |
|
|
|
| 51 |
|
|
/* Determine appropriate breakpoint contents and size for this address. */
|
| 52 |
|
|
bp = gdbarch_breakpoint_from_pc
|
| 53 |
|
|
(gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size);
|
| 54 |
|
|
if (bp == NULL)
|
| 55 |
|
|
error (_("Software breakpoints not implemented for this target."));
|
| 56 |
|
|
|
| 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,
|
| 60 |
|
|
bp_tgt->placed_size);
|
| 61 |
|
|
|
| 62 |
|
|
/* Write the breakpoint. */
|
| 63 |
|
|
if (val == 0)
|
| 64 |
|
|
val = target_write_memory (bp_tgt->placed_address, bp,
|
| 65 |
|
|
bp_tgt->placed_size);
|
| 66 |
|
|
|
| 67 |
|
|
return val;
|
| 68 |
|
|
}
|
| 69 |
|
|
|
| 70 |
|
|
|
| 71 |
|
|
int
|
| 72 |
|
|
default_memory_remove_breakpoint (struct gdbarch *gdbarch,
|
| 73 |
|
|
struct bp_target_info *bp_tgt)
|
| 74 |
|
|
{
|
| 75 |
|
|
return target_write_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
|
| 76 |
|
|
bp_tgt->placed_size);
|
| 77 |
|
|
}
|
| 78 |
|
|
|
| 79 |
|
|
|
| 80 |
|
|
int
|
| 81 |
|
|
memory_insert_breakpoint (struct bp_target_info *bp_tgt)
|
| 82 |
|
|
{
|
| 83 |
|
|
return gdbarch_memory_insert_breakpoint (current_gdbarch, bp_tgt);
|
| 84 |
|
|
}
|
| 85 |
|
|
|
| 86 |
|
|
int
|
| 87 |
|
|
memory_remove_breakpoint (struct bp_target_info *bp_tgt)
|
| 88 |
|
|
{
|
| 89 |
|
|
return gdbarch_memory_remove_breakpoint (current_gdbarch, bp_tgt);
|
| 90 |
|
|
}
|
