old-cross-binutils/gdb/mem-break.c

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/* Simulate breakpoints by patching locations in the target system, for GDB.
Copyright 1990, 1991 Free Software Foundation, Inc.
Contributed by Cygnus Support. Written by John Gilmore.
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This file is part of GDB.
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
the Free Software Foundation; either version 2 of the License, or
(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
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
#ifdef BREAKPOINT
/* This file is only useful if BREAKPOINT is set. If not, we punt. */
#include <stdio.h>
#include "breakpoint.h"
#include "inferior.h"
#include "target.h"
/* This is the sequence of bytes we insert for a breakpoint. On some
machines, breakpoints are handled by the target environment and we
don't have to worry about them here. */
static char break_insn[] = BREAKPOINT;
/* This is only to check that BREAKPOINT fits in BREAKPOINT_MAX bytes. */
static char check_break_insn_size[BREAKPOINT_MAX] = BREAKPOINT;
/* Insert a breakpoint on machines 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 sizeof BREAKPOINT bytes.
FIXME: This size is target_arch dependent and should be available in
the target_arch transfer vector, if we ever have one... */
int
memory_insert_breakpoint (addr, contents_cache)
CORE_ADDR addr;
char *contents_cache;
{
int val;
val = target_read_memory (addr, contents_cache, sizeof break_insn);
if (val == 0)
val = target_write_memory (addr, break_insn, sizeof break_insn);
return val;
}
int
memory_remove_breakpoint (addr, contents_cache)
CORE_ADDR addr;
char *contents_cache;
{
return target_write_memory (addr, contents_cache, sizeof break_insn);
}
int memory_breakpoint_size = sizeof (break_insn);
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#else /* BREAKPOINT */
char nogo[] = "Breakpoints not implemented for this target.";
int
memory_insert_breakpoint (addr, contents_cache)
CORE_ADDR addr;
char *contents_cache;
{
error (nogo);
return 0; /* lint */
}
int
memory_remove_breakpoint (addr, contents_cache)
CORE_ADDR addr;
char *contents_cache;
{
error (nogo);
return 0; /* lint */
}
int memory_breakpoint_size = -1;
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#endif /* BREAKPOINT */