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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
commit071ea11e85eb9d529cc5eb3d35f6247466a21b99 (patch)
tree5deda65b8d7b04d1f4cbc534c3206d328e1267ec /gdb/mem-break.c
parent1730ec6b1848f0f32154277f788fb29f88d8475b (diff)
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Initial creation of sourceware repository
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diff --git a/gdb/mem-break.c b/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.
-
-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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#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);
-
-
-#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;
-
-#endif /* BREAKPOINT */