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611cb4a5 | 1 | /* Memory breakpoint operations for the remote server for GDB. |
4c38e0a4 | 2 | Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010 |
0fb0cc75 | 3 | Free Software Foundation, Inc. |
611cb4a5 DJ |
4 | |
5 | Contributed by MontaVista Software. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
611cb4a5 DJ |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
611cb4a5 DJ |
21 | |
22 | #include "server.h" | |
23 | ||
f450004a | 24 | const unsigned char *breakpoint_data; |
611cb4a5 DJ |
25 | int breakpoint_len; |
26 | ||
27 | #define MAX_BREAKPOINT_LEN 8 | |
28 | ||
29 | struct breakpoint | |
30 | { | |
31 | struct breakpoint *next; | |
32 | CORE_ADDR pc; | |
33 | unsigned char old_data[MAX_BREAKPOINT_LEN]; | |
34 | ||
35 | /* Non-zero iff we are stepping over this breakpoint. */ | |
36 | int reinserting; | |
37 | ||
38 | /* Non-NULL iff this breakpoint was inserted to step over | |
39 | another one. Points to the other breakpoint (which is also | |
40 | in the *next chain somewhere). */ | |
41 | struct breakpoint *breakpoint_to_reinsert; | |
42 | ||
b65d95c5 DJ |
43 | /* Function to call when we hit this breakpoint. If it returns 1, |
44 | the breakpoint will be deleted; 0, it will be reinserted for | |
45 | another round. */ | |
46 | int (*handler) (CORE_ADDR); | |
611cb4a5 DJ |
47 | }; |
48 | ||
611cb4a5 | 49 | void |
b65d95c5 | 50 | set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR)) |
611cb4a5 | 51 | { |
95954743 | 52 | struct process_info *proc = current_process (); |
611cb4a5 DJ |
53 | struct breakpoint *bp; |
54 | ||
55 | if (breakpoint_data == NULL) | |
56 | error ("Target does not support breakpoints."); | |
57 | ||
bca929d3 | 58 | bp = xmalloc (sizeof (struct breakpoint)); |
611cb4a5 DJ |
59 | memset (bp, 0, sizeof (struct breakpoint)); |
60 | ||
61 | (*the_target->read_memory) (where, bp->old_data, | |
62 | breakpoint_len); | |
63 | (*the_target->write_memory) (where, breakpoint_data, | |
64 | breakpoint_len); | |
65 | ||
66 | bp->pc = where; | |
67 | bp->handler = handler; | |
68 | ||
95954743 PA |
69 | bp->next = proc->breakpoints; |
70 | proc->breakpoints = bp; | |
611cb4a5 DJ |
71 | } |
72 | ||
73 | static void | |
74 | delete_breakpoint (struct breakpoint *bp) | |
75 | { | |
95954743 | 76 | struct process_info *proc = current_process (); |
611cb4a5 DJ |
77 | struct breakpoint *cur; |
78 | ||
95954743 | 79 | if (proc->breakpoints == bp) |
611cb4a5 | 80 | { |
95954743 | 81 | proc->breakpoints = bp->next; |
611cb4a5 DJ |
82 | (*the_target->write_memory) (bp->pc, bp->old_data, |
83 | breakpoint_len); | |
84 | free (bp); | |
85 | return; | |
86 | } | |
95954743 | 87 | cur = proc->breakpoints; |
611cb4a5 DJ |
88 | while (cur->next) |
89 | { | |
90 | if (cur->next == bp) | |
91 | { | |
92 | cur->next = bp->next; | |
93 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
94 | breakpoint_len); | |
95 | free (bp); | |
96 | return; | |
97 | } | |
98 | } | |
99 | warning ("Could not find breakpoint in list."); | |
100 | } | |
101 | ||
102 | static struct breakpoint * | |
103 | find_breakpoint_at (CORE_ADDR where) | |
104 | { | |
95954743 PA |
105 | struct process_info *proc = current_process (); |
106 | struct breakpoint *bp = proc->breakpoints; | |
611cb4a5 DJ |
107 | |
108 | while (bp != NULL) | |
109 | { | |
110 | if (bp->pc == where) | |
111 | return bp; | |
112 | bp = bp->next; | |
113 | } | |
114 | ||
115 | return NULL; | |
116 | } | |
117 | ||
68070c10 PA |
118 | void |
119 | delete_breakpoint_at (CORE_ADDR addr) | |
120 | { | |
121 | struct breakpoint *bp = find_breakpoint_at (addr); | |
122 | if (bp != NULL) | |
123 | delete_breakpoint (bp); | |
124 | } | |
125 | ||
b65d95c5 | 126 | static int |
611cb4a5 DJ |
127 | reinsert_breakpoint_handler (CORE_ADDR stop_pc) |
128 | { | |
129 | struct breakpoint *stop_bp, *orig_bp; | |
130 | ||
131 | stop_bp = find_breakpoint_at (stop_pc); | |
132 | if (stop_bp == NULL) | |
133 | error ("lost the stopping breakpoint."); | |
134 | ||
135 | orig_bp = stop_bp->breakpoint_to_reinsert; | |
136 | if (orig_bp == NULL) | |
137 | error ("no breakpoint to reinsert"); | |
138 | ||
139 | (*the_target->write_memory) (orig_bp->pc, breakpoint_data, | |
140 | breakpoint_len); | |
141 | orig_bp->reinserting = 0; | |
b65d95c5 | 142 | return 1; |
611cb4a5 DJ |
143 | } |
144 | ||
145 | void | |
146 | reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at) | |
147 | { | |
148 | struct breakpoint *bp, *orig_bp; | |
149 | ||
fd3a5ca1 | 150 | orig_bp = find_breakpoint_at (stop_pc); |
611cb4a5 DJ |
151 | if (orig_bp == NULL) |
152 | error ("Could not find original breakpoint in list."); | |
153 | ||
b65d95c5 DJ |
154 | set_breakpoint_at (stop_at, reinsert_breakpoint_handler); |
155 | ||
611cb4a5 DJ |
156 | bp = find_breakpoint_at (stop_at); |
157 | if (bp == NULL) | |
158 | error ("Could not find breakpoint in list (reinserting by breakpoint)."); | |
159 | bp->breakpoint_to_reinsert = orig_bp; | |
160 | ||
161 | (*the_target->write_memory) (orig_bp->pc, orig_bp->old_data, | |
162 | breakpoint_len); | |
163 | orig_bp->reinserting = 1; | |
164 | } | |
165 | ||
166 | void | |
167 | uninsert_breakpoint (CORE_ADDR stopped_at) | |
168 | { | |
169 | struct breakpoint *bp; | |
170 | ||
171 | bp = find_breakpoint_at (stopped_at); | |
172 | if (bp == NULL) | |
173 | error ("Could not find breakpoint in list (uninserting)."); | |
174 | ||
175 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
176 | breakpoint_len); | |
177 | bp->reinserting = 1; | |
178 | } | |
179 | ||
180 | void | |
181 | reinsert_breakpoint (CORE_ADDR stopped_at) | |
182 | { | |
183 | struct breakpoint *bp; | |
184 | ||
185 | bp = find_breakpoint_at (stopped_at); | |
186 | if (bp == NULL) | |
187 | error ("Could not find breakpoint in list (uninserting)."); | |
188 | if (! bp->reinserting) | |
189 | error ("Breakpoint already inserted at reinsert time."); | |
190 | ||
191 | (*the_target->write_memory) (bp->pc, breakpoint_data, | |
192 | breakpoint_len); | |
193 | bp->reinserting = 0; | |
194 | } | |
195 | ||
196 | int | |
197 | check_breakpoints (CORE_ADDR stop_pc) | |
198 | { | |
199 | struct breakpoint *bp; | |
200 | ||
201 | bp = find_breakpoint_at (stop_pc); | |
202 | if (bp == NULL) | |
203 | return 0; | |
204 | if (bp->reinserting) | |
205 | { | |
206 | warning ("Hit a removed breakpoint?"); | |
207 | return 0; | |
208 | } | |
209 | ||
b65d95c5 DJ |
210 | if ((*bp->handler) (bp->pc)) |
211 | { | |
212 | delete_breakpoint (bp); | |
213 | return 2; | |
214 | } | |
215 | else | |
216 | return 1; | |
611cb4a5 DJ |
217 | } |
218 | ||
219 | void | |
f450004a | 220 | set_breakpoint_data (const unsigned char *bp_data, int bp_len) |
611cb4a5 DJ |
221 | { |
222 | breakpoint_data = bp_data; | |
223 | breakpoint_len = bp_len; | |
224 | } | |
225 | ||
226 | void | |
f450004a | 227 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 | 228 | { |
95954743 PA |
229 | struct process_info *proc = current_process (); |
230 | struct breakpoint *bp = proc->breakpoints; | |
611cb4a5 DJ |
231 | CORE_ADDR mem_end = mem_addr + mem_len; |
232 | ||
233 | for (; bp != NULL; bp = bp->next) | |
234 | { | |
235 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
236 | CORE_ADDR start, end; | |
237 | int copy_offset, copy_len, buf_offset; | |
238 | ||
239 | if (mem_addr >= bp_end) | |
240 | continue; | |
241 | if (bp->pc >= mem_end) | |
242 | continue; | |
243 | ||
244 | start = bp->pc; | |
245 | if (mem_addr > start) | |
246 | start = mem_addr; | |
247 | ||
248 | end = bp_end; | |
249 | if (end > mem_end) | |
250 | end = mem_end; | |
251 | ||
252 | copy_len = end - start; | |
253 | copy_offset = start - bp->pc; | |
254 | buf_offset = start - mem_addr; | |
255 | ||
256 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); | |
257 | } | |
258 | } | |
259 | ||
260 | void | |
f450004a | 261 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 | 262 | { |
95954743 PA |
263 | struct process_info *proc = current_process (); |
264 | struct breakpoint *bp = proc->breakpoints; | |
611cb4a5 DJ |
265 | CORE_ADDR mem_end = mem_addr + mem_len; |
266 | ||
267 | for (; bp != NULL; bp = bp->next) | |
268 | { | |
269 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
270 | CORE_ADDR start, end; | |
271 | int copy_offset, copy_len, buf_offset; | |
272 | ||
273 | if (mem_addr >= bp_end) | |
274 | continue; | |
275 | if (bp->pc >= mem_end) | |
276 | continue; | |
277 | ||
278 | start = bp->pc; | |
279 | if (mem_addr > start) | |
280 | start = mem_addr; | |
281 | ||
282 | end = bp_end; | |
283 | if (end > mem_end) | |
284 | end = mem_end; | |
285 | ||
286 | copy_len = end - start; | |
287 | copy_offset = start - bp->pc; | |
288 | buf_offset = start - mem_addr; | |
289 | ||
290 | memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len); | |
291 | if (bp->reinserting == 0) | |
292 | memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len); | |
293 | } | |
294 | } | |
ae13219e | 295 | |
95954743 | 296 | /* Delete all breakpoints, and un-insert them from the inferior. */ |
ae13219e DJ |
297 | |
298 | void | |
299 | delete_all_breakpoints (void) | |
300 | { | |
95954743 PA |
301 | struct process_info *proc = current_process (); |
302 | ||
303 | while (proc->breakpoints) | |
304 | delete_breakpoint (proc->breakpoints); | |
305 | } | |
306 | ||
307 | /* Release all breakpoints, but do not try to un-insert them from the | |
308 | inferior. */ | |
309 | ||
310 | void | |
311 | free_all_breakpoints (struct process_info *proc) | |
312 | { | |
313 | struct breakpoint *bp; | |
314 | ||
315 | while (proc->breakpoints) | |
316 | { | |
317 | bp = proc->breakpoints; | |
318 | proc->breakpoints = bp->next; | |
319 | free (bp); | |
320 | } | |
ae13219e | 321 | } |