old-cross-binutils/gdb/mem-break.c
Joel Brobecker 0b30217134 Copyright year update in most files of the GDB Project.
gdb/ChangeLog:

        Copyright year update in most files of the GDB Project.
2012-01-04 08:17:56 +00:00

91 lines
2.8 KiB
C

/* Simulate breakpoints by patching locations in the target system, for GDB.
Copyright (C) 1990-1993, 1995, 1997-2000, 2002, 2007-2012 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 3 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, see <http://www.gnu.org/licenses/>. */
#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 gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
int val;
const unsigned char *bp;
/* Determine appropriate breakpoint contents and size for this address. */
bp = gdbarch_breakpoint_from_pc
(gdbarch, &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_raw_memory (bp_tgt->placed_address, bp,
bp_tgt->placed_size);
return val;
}
int
default_memory_remove_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
return target_write_raw_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
bp_tgt->placed_size);
}
int
memory_insert_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
return gdbarch_memory_insert_breakpoint (gdbarch, bp_tgt);
}
int
memory_remove_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
return gdbarch_memory_remove_breakpoint (gdbarch, bp_tgt);
}