103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* Simulate breakpoints by patching locations in the target system, for GDB.
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Copyright 1990, 1991 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#ifdef BREAKPOINT
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/* This file is only useful if BREAKPOINT is set. If not, we punt. */
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#include <stdio.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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/* This is the sequence of bytes we insert for a breakpoint. On some
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machines, breakpoints are handled by the target environment and we
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don't have to worry about them here. */
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static char break_insn[] = BREAKPOINT;
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/* This is only to check that BREAKPOINT fits in BREAKPOINT_MAX bytes. */
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static char check_break_insn_size[BREAKPOINT_MAX] = BREAKPOINT;
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/* Insert a breakpoint on machines that don't have any better breakpoint
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support. We read the contents of the target location and stash it,
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then overwrite it with a breakpoint instruction. ADDR is the target
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location in the target machine. CONTENTS_CACHE is a pointer to
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memory allocated for saving the target contents. It is guaranteed
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by the caller to be long enough to save sizeof BREAKPOINT bytes.
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FIXME: This size is target_arch dependent and should be available in
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the target_arch transfer vector, if we ever have one... */
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int
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memory_insert_breakpoint (addr, contents_cache)
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CORE_ADDR addr;
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char *contents_cache;
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{
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int val;
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val = target_read_memory (addr, contents_cache, sizeof break_insn);
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if (val == 0)
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val = target_write_memory (addr, break_insn, sizeof break_insn);
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return val;
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}
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int
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memory_remove_breakpoint (addr, contents_cache)
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CORE_ADDR addr;
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char *contents_cache;
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{
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return target_write_memory (addr, contents_cache, sizeof break_insn);
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}
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int memory_breakpoint_size = sizeof (break_insn);
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#else /* BREAKPOINT */
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char nogo[] = "Breakpoints not implemented for this target.";
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int
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memory_insert_breakpoint (addr, contents_cache)
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CORE_ADDR addr;
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char *contents_cache;
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{
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error (nogo);
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return 0; /* lint */
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}
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int
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memory_remove_breakpoint (addr, contents_cache)
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CORE_ADDR addr;
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char *contents_cache;
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{
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error (nogo);
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return 0; /* lint */
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}
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int memory_breakpoint_size = -1;
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#endif /* BREAKPOINT */
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