89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/* Simulate breakpoints by patching locations in the target system, for GDB.
|
|
|
|
Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000, 2002,
|
|
2007 Free Software Foundation, Inc.
|
|
|
|
Contributed by Cygnus Support. Written by John Gilmore.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#include "defs.h"
|
|
|
|
/* This file is only useful if BREAKPOINT_FROM_PC is set. If not, we
|
|
punt. */
|
|
|
|
#include "symtab.h"
|
|
#include "breakpoint.h"
|
|
#include "inferior.h"
|
|
#include "target.h"
|
|
|
|
|
|
/* Insert a breakpoint on targets that don't have any better
|
|
breakpoint support. We read the contents of the target location
|
|
and stash it, then overwrite it with a breakpoint instruction.
|
|
BP_TGT->placed_address is the target location in the target
|
|
machine. BP_TGT->shadow_contents is some memory allocated for
|
|
saving the target contents. It is guaranteed by the caller to be
|
|
long enough to save BREAKPOINT_LEN bytes (this is accomplished via
|
|
BREAKPOINT_MAX). */
|
|
|
|
int
|
|
default_memory_insert_breakpoint (struct bp_target_info *bp_tgt)
|
|
{
|
|
int val;
|
|
const unsigned char *bp;
|
|
int bplen;
|
|
|
|
/* Determine appropriate breakpoint contents and size for this address. */
|
|
bp = BREAKPOINT_FROM_PC (&bp_tgt->placed_address, &bp_tgt->placed_size);
|
|
if (bp == NULL)
|
|
error (_("Software breakpoints not implemented for this target."));
|
|
|
|
/* Save the memory contents. */
|
|
bp_tgt->shadow_len = bp_tgt->placed_size;
|
|
val = target_read_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
|
|
bp_tgt->placed_size);
|
|
|
|
/* Write the breakpoint. */
|
|
if (val == 0)
|
|
val = target_write_memory (bp_tgt->placed_address, bp,
|
|
bp_tgt->placed_size);
|
|
|
|
return val;
|
|
}
|
|
|
|
|
|
int
|
|
default_memory_remove_breakpoint (struct bp_target_info *bp_tgt)
|
|
{
|
|
return target_write_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
|
|
bp_tgt->placed_size);
|
|
}
|
|
|
|
|
|
int
|
|
memory_insert_breakpoint (struct bp_target_info *bp_tgt)
|
|
{
|
|
return MEMORY_INSERT_BREAKPOINT (bp_tgt);
|
|
}
|
|
|
|
int
|
|
memory_remove_breakpoint (struct bp_target_info *bp_tgt)
|
|
{
|
|
return MEMORY_REMOVE_BREAKPOINT (bp_tgt);
|
|
}
|