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/* Simulate breakpoints by patching locations in the target system, for GDB.
Copyright 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000,
2002 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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. ADDR is the target
location in the target machine. CONTENTS_CACHE is a pointer to
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 (CORE_ADDR addr, char *contents_cache)
{
int val;
const unsigned char *bp;
int bplen;
/* Determine appropriate breakpoint contents and size for this address. */
bp = BREAKPOINT_FROM_PC (&addr, &bplen);
if (bp == NULL)
error ("Software breakpoints not implemented for this target.");
/* Save the memory contents. */
val = target_read_memory (addr, contents_cache, bplen);
/* Write the breakpoint. */
if (val == 0)
val = target_write_memory (addr, (char *) bp, bplen);
return val;
}
int
default_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
{
const unsigned char *bp;
int bplen;
/* Determine appropriate breakpoint contents and size for this address. */
bp = BREAKPOINT_FROM_PC (&addr, &bplen);
if (bp == NULL)
error ("Software breakpoints not implemented for this target.");
return target_write_memory (addr, contents_cache, bplen);
}
int
memory_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
{
return MEMORY_INSERT_BREAKPOINT(addr, contents_cache);
}
int
memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
{
return MEMORY_REMOVE_BREAKPOINT(addr, contents_cache);
}
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