| /* 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); |
| } |