| 1 | /* Simulate breakpoints by patching locations in the target system, for GDB. |
| 2 | |
| 3 | Copyright (C) 1990, 1991, 1992, 1993, 1995, 1997, 1998, 1999, 2000, |
| 4 | 2002 Free Software Foundation, Inc. |
| 5 | |
| 6 | Contributed by Cygnus Support. Written by John Gilmore. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 23 | Boston, MA 02110-1301, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | |
| 27 | /* This file is only useful if BREAKPOINT_FROM_PC is set. If not, we |
| 28 | punt. */ |
| 29 | |
| 30 | #include "symtab.h" |
| 31 | #include "breakpoint.h" |
| 32 | #include "inferior.h" |
| 33 | #include "target.h" |
| 34 | |
| 35 | |
| 36 | /* Insert a breakpoint on targets that don't have any better breakpoint |
| 37 | support. We read the contents of the target location and stash it, |
| 38 | then overwrite it with a breakpoint instruction. ADDR is the target |
| 39 | location in the target machine. CONTENTS_CACHE is a pointer to |
| 40 | memory allocated for saving the target contents. It is guaranteed |
| 41 | by the caller to be long enough to save BREAKPOINT_LEN bytes (this |
| 42 | is accomplished via BREAKPOINT_MAX). */ |
| 43 | |
| 44 | int |
| 45 | default_memory_insert_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache) |
| 46 | { |
| 47 | int val; |
| 48 | const unsigned char *bp; |
| 49 | int bplen; |
| 50 | |
| 51 | /* Determine appropriate breakpoint contents and size for this address. */ |
| 52 | bp = BREAKPOINT_FROM_PC (&addr, &bplen); |
| 53 | if (bp == NULL) |
| 54 | error (_("Software breakpoints not implemented for this target.")); |
| 55 | |
| 56 | /* Save the memory contents. */ |
| 57 | val = target_read_memory (addr, contents_cache, bplen); |
| 58 | |
| 59 | /* Write the breakpoint. */ |
| 60 | if (val == 0) |
| 61 | val = target_write_memory (addr, bp, bplen); |
| 62 | |
| 63 | return val; |
| 64 | } |
| 65 | |
| 66 | |
| 67 | int |
| 68 | default_memory_remove_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache) |
| 69 | { |
| 70 | const bfd_byte *bp; |
| 71 | int bplen; |
| 72 | |
| 73 | /* Determine appropriate breakpoint contents and size for this address. */ |
| 74 | bp = BREAKPOINT_FROM_PC (&addr, &bplen); |
| 75 | if (bp == NULL) |
| 76 | error (_("Software breakpoints not implemented for this target.")); |
| 77 | |
| 78 | return target_write_memory (addr, contents_cache, bplen); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | int |
| 83 | memory_insert_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache) |
| 84 | { |
| 85 | return MEMORY_INSERT_BREAKPOINT(addr, contents_cache); |
| 86 | } |
| 87 | |
| 88 | int |
| 89 | memory_remove_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache) |
| 90 | { |
| 91 | return MEMORY_REMOVE_BREAKPOINT(addr, contents_cache); |
| 92 | } |