Commit | Line | Data |
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c906108c | 1 | /* Simulate breakpoints by patching locations in the target system, for GDB. |
f4f9705a | 2 | |
0b302171 JB |
3 | Copyright (C) 1990-1993, 1995, 1997-2000, 2002, 2007-2012 Free |
4 | Software Foundation, Inc. | |
f4f9705a | 5 | |
c906108c SS |
6 | Contributed by Cygnus Support. Written by John Gilmore. |
7 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
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 | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 13 | (at your option) any later version. |
c906108c | 14 | |
c5aa993b JM |
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. | |
c906108c | 19 | |
c5aa993b | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | ||
aaab4dba AC |
25 | /* This file is only useful if BREAKPOINT_FROM_PC is set. If not, we |
26 | punt. */ | |
c906108c SS |
27 | |
28 | #include "symtab.h" | |
29 | #include "breakpoint.h" | |
30 | #include "inferior.h" | |
31 | #include "target.h" | |
35c63cd8 | 32 | #include "gdb_string.h" |
c906108c SS |
33 | |
34 | ||
8181d85f DJ |
35 | /* Insert a breakpoint on targets that don't have any better |
36 | breakpoint support. We read the contents of the target location | |
37 | and stash it, then overwrite it with a breakpoint instruction. | |
38 | BP_TGT->placed_address is the target location in the target | |
39 | machine. BP_TGT->shadow_contents is some memory allocated for | |
40 | saving the target contents. It is guaranteed by the caller to be | |
41 | long enough to save BREAKPOINT_LEN bytes (this is accomplished via | |
42 | BREAKPOINT_MAX). */ | |
c906108c SS |
43 | |
44 | int | |
ae4b2284 MD |
45 | default_memory_insert_breakpoint (struct gdbarch *gdbarch, |
46 | struct bp_target_info *bp_tgt) | |
c906108c SS |
47 | { |
48 | int val; | |
f4f9705a | 49 | const unsigned char *bp; |
35c63cd8 | 50 | gdb_byte *readbuf; |
c906108c SS |
51 | |
52 | /* Determine appropriate breakpoint contents and size for this address. */ | |
3b3b875c | 53 | bp = gdbarch_breakpoint_from_pc |
ae4b2284 | 54 | (gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size); |
c906108c | 55 | if (bp == NULL) |
8a3fe4f8 | 56 | error (_("Software breakpoints not implemented for this target.")); |
c906108c | 57 | |
35c63cd8 JB |
58 | /* Save the memory contents in the shadow_contents buffer and then |
59 | write the breakpoint instruction. */ | |
8181d85f | 60 | bp_tgt->shadow_len = bp_tgt->placed_size; |
35c63cd8 JB |
61 | readbuf = alloca (bp_tgt->placed_size); |
62 | val = target_read_memory (bp_tgt->placed_address, readbuf, | |
8181d85f | 63 | bp_tgt->placed_size); |
c906108c | 64 | if (val == 0) |
35c63cd8 JB |
65 | { |
66 | memcpy (bp_tgt->shadow_contents, readbuf, bp_tgt->placed_size); | |
67 | val = target_write_raw_memory (bp_tgt->placed_address, bp, | |
68 | bp_tgt->placed_size); | |
69 | } | |
c906108c SS |
70 | |
71 | return val; | |
72 | } | |
73 | ||
74 | ||
75 | int | |
ae4b2284 MD |
76 | default_memory_remove_breakpoint (struct gdbarch *gdbarch, |
77 | struct bp_target_info *bp_tgt) | |
c906108c | 78 | { |
f0ba3972 PA |
79 | return target_write_raw_memory (bp_tgt->placed_address, bp_tgt->shadow_contents, |
80 | bp_tgt->placed_size); | |
c906108c | 81 | } |
917317f4 JM |
82 | |
83 | ||
917317f4 | 84 | int |
a6d9a66e UW |
85 | memory_insert_breakpoint (struct gdbarch *gdbarch, |
86 | struct bp_target_info *bp_tgt) | |
917317f4 | 87 | { |
a6d9a66e | 88 | return gdbarch_memory_insert_breakpoint (gdbarch, bp_tgt); |
917317f4 JM |
89 | } |
90 | ||
917317f4 | 91 | int |
a6d9a66e UW |
92 | memory_remove_breakpoint (struct gdbarch *gdbarch, |
93 | struct bp_target_info *bp_tgt) | |
917317f4 | 94 | { |
a6d9a66e | 95 | return gdbarch_memory_remove_breakpoint (gdbarch, bp_tgt); |
917317f4 | 96 | } |