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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [mem-break.c] - Blame information for rev 827

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1 24 jeremybenn
/* Simulate breakpoints by patching locations in the target system, for GDB.
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   Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000, 2002,
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   2007, 2008 Free Software Foundation, Inc.
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   Contributed by Cygnus Support.  Written by John Gilmore.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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/* This file is only useful if BREAKPOINT_FROM_PC is set.  If not, we
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   punt.  */
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#include "symtab.h"
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#include "breakpoint.h"
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#include "inferior.h"
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#include "target.h"
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/* Insert a breakpoint on targets that don't have any better
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   breakpoint support.  We read the contents of the target location
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   and stash it, then overwrite it with a breakpoint instruction.
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   BP_TGT->placed_address is the target location in the target
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   machine.  BP_TGT->shadow_contents is some memory allocated for
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   saving the target contents.  It is guaranteed by the caller to be
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   long enough to save BREAKPOINT_LEN bytes (this is accomplished via
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   BREAKPOINT_MAX).  */
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int
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default_memory_insert_breakpoint (struct gdbarch *gdbarch,
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                                  struct bp_target_info *bp_tgt)
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{
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  int val;
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  const unsigned char *bp;
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  int bplen;
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  /* Determine appropriate breakpoint contents and size for this address.  */
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  bp = gdbarch_breakpoint_from_pc
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       (gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size);
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  if (bp == NULL)
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    error (_("Software breakpoints not implemented for this target."));
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  /* Save the memory contents.  */
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  bp_tgt->shadow_len = bp_tgt->placed_size;
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  val = target_read_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
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                            bp_tgt->placed_size);
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  /* Write the breakpoint.  */
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  if (val == 0)
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    val = target_write_memory (bp_tgt->placed_address, bp,
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                               bp_tgt->placed_size);
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  return val;
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}
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int
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default_memory_remove_breakpoint (struct gdbarch *gdbarch,
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                                  struct bp_target_info *bp_tgt)
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{
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  return target_write_memory (bp_tgt->placed_address, bp_tgt->shadow_contents,
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                              bp_tgt->placed_size);
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}
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int
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memory_insert_breakpoint (struct bp_target_info *bp_tgt)
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{
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  return gdbarch_memory_insert_breakpoint (current_gdbarch, bp_tgt);
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}
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int
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memory_remove_breakpoint (struct bp_target_info *bp_tgt)
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{
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  return gdbarch_memory_remove_breakpoint (current_gdbarch, bp_tgt);
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}

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