| /* Simulate breakpoints by patching locations in the target system, for GDB. |
| |
| Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000, 2002, |
| 2007 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., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, 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. |
| BP_TGT->placed_address is the target location in the target |
| machine. BP_TGT->shadow_contents is some 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 (struct bp_target_info *bp_tgt) |
| { |
| int val; |
| const unsigned char *bp; |
| int bplen; |
| |
| /* Determine appropriate breakpoint contents and size for this address. */ |
| bp = BREAKPOINT_FROM_PC (&bp_tgt->placed_address, &bp_tgt->placed_size); |
| if (bp == NULL) |
| error (_("Software breakpoints not implemented for this target.")); |
| |
| /* Save the memory contents. */ |
| bp_tgt->shadow_len = bp_tgt->placed_size; |
| val = target_read_memory (bp_tgt->placed_address, bp_tgt->shadow_contents, |
| bp_tgt->placed_size); |
| |
| /* Write the breakpoint. */ |
| if (val == 0) |
| val = target_write_memory (bp_tgt->placed_address, bp, |
| bp_tgt->placed_size); |
| |
| return val; |
| } |
| |
| |
| int |
| default_memory_remove_breakpoint (struct bp_target_info *bp_tgt) |
| { |
| return target_write_memory (bp_tgt->placed_address, bp_tgt->shadow_contents, |
| bp_tgt->placed_size); |
| } |
| |
| |
| int |
| memory_insert_breakpoint (struct bp_target_info *bp_tgt) |
| { |
| return MEMORY_INSERT_BREAKPOINT (bp_tgt); |
| } |
| |
| int |
| memory_remove_breakpoint (struct bp_target_info *bp_tgt) |
| { |
| return MEMORY_REMOVE_BREAKPOINT (bp_tgt); |
| } |