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611cb4a5 | 1 | /* Memory breakpoint operations for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc. |
611cb4a5 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
611cb4a5 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
611cb4a5 DJ |
20 | |
21 | #include "server.h" | |
22 | ||
f450004a | 23 | const unsigned char *breakpoint_data; |
611cb4a5 DJ |
24 | int breakpoint_len; |
25 | ||
26 | #define MAX_BREAKPOINT_LEN 8 | |
27 | ||
28 | struct breakpoint | |
29 | { | |
30 | struct breakpoint *next; | |
31 | CORE_ADDR pc; | |
32 | unsigned char old_data[MAX_BREAKPOINT_LEN]; | |
33 | ||
34 | /* Non-zero iff we are stepping over this breakpoint. */ | |
35 | int reinserting; | |
36 | ||
37 | /* Non-NULL iff this breakpoint was inserted to step over | |
38 | another one. Points to the other breakpoint (which is also | |
39 | in the *next chain somewhere). */ | |
40 | struct breakpoint *breakpoint_to_reinsert; | |
41 | ||
42 | /* Function to call when we hit this breakpoint. */ | |
43 | void (*handler) (CORE_ADDR); | |
44 | }; | |
45 | ||
46 | struct breakpoint *breakpoints; | |
47 | ||
48 | void | |
49 | set_breakpoint_at (CORE_ADDR where, void (*handler) (CORE_ADDR)) | |
50 | { | |
51 | struct breakpoint *bp; | |
52 | ||
53 | if (breakpoint_data == NULL) | |
54 | error ("Target does not support breakpoints."); | |
55 | ||
56 | bp = malloc (sizeof (struct breakpoint)); | |
57 | memset (bp, 0, sizeof (struct breakpoint)); | |
58 | ||
59 | (*the_target->read_memory) (where, bp->old_data, | |
60 | breakpoint_len); | |
61 | (*the_target->write_memory) (where, breakpoint_data, | |
62 | breakpoint_len); | |
63 | ||
64 | bp->pc = where; | |
65 | bp->handler = handler; | |
66 | ||
67 | bp->next = breakpoints; | |
68 | breakpoints = bp; | |
69 | } | |
70 | ||
71 | static void | |
72 | delete_breakpoint (struct breakpoint *bp) | |
73 | { | |
74 | struct breakpoint *cur; | |
75 | ||
76 | if (breakpoints == bp) | |
77 | { | |
78 | breakpoints = bp->next; | |
79 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
80 | breakpoint_len); | |
81 | free (bp); | |
82 | return; | |
83 | } | |
84 | cur = breakpoints; | |
85 | while (cur->next) | |
86 | { | |
87 | if (cur->next == bp) | |
88 | { | |
89 | cur->next = bp->next; | |
90 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
91 | breakpoint_len); | |
92 | free (bp); | |
93 | return; | |
94 | } | |
95 | } | |
96 | warning ("Could not find breakpoint in list."); | |
97 | } | |
98 | ||
99 | static struct breakpoint * | |
100 | find_breakpoint_at (CORE_ADDR where) | |
101 | { | |
102 | struct breakpoint *bp = breakpoints; | |
103 | ||
104 | while (bp != NULL) | |
105 | { | |
106 | if (bp->pc == where) | |
107 | return bp; | |
108 | bp = bp->next; | |
109 | } | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
68070c10 PA |
114 | void |
115 | delete_breakpoint_at (CORE_ADDR addr) | |
116 | { | |
117 | struct breakpoint *bp = find_breakpoint_at (addr); | |
118 | if (bp != NULL) | |
119 | delete_breakpoint (bp); | |
120 | } | |
121 | ||
611cb4a5 DJ |
122 | static void |
123 | reinsert_breakpoint_handler (CORE_ADDR stop_pc) | |
124 | { | |
125 | struct breakpoint *stop_bp, *orig_bp; | |
126 | ||
127 | stop_bp = find_breakpoint_at (stop_pc); | |
128 | if (stop_bp == NULL) | |
129 | error ("lost the stopping breakpoint."); | |
130 | ||
131 | orig_bp = stop_bp->breakpoint_to_reinsert; | |
132 | if (orig_bp == NULL) | |
133 | error ("no breakpoint to reinsert"); | |
134 | ||
135 | (*the_target->write_memory) (orig_bp->pc, breakpoint_data, | |
136 | breakpoint_len); | |
137 | orig_bp->reinserting = 0; | |
138 | delete_breakpoint (stop_bp); | |
139 | } | |
140 | ||
141 | void | |
142 | reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at) | |
143 | { | |
144 | struct breakpoint *bp, *orig_bp; | |
145 | ||
146 | set_breakpoint_at (stop_at, reinsert_breakpoint_handler); | |
147 | ||
fd3a5ca1 | 148 | orig_bp = find_breakpoint_at (stop_pc); |
611cb4a5 DJ |
149 | if (orig_bp == NULL) |
150 | error ("Could not find original breakpoint in list."); | |
151 | ||
152 | bp = find_breakpoint_at (stop_at); | |
153 | if (bp == NULL) | |
154 | error ("Could not find breakpoint in list (reinserting by breakpoint)."); | |
155 | bp->breakpoint_to_reinsert = orig_bp; | |
156 | ||
157 | (*the_target->write_memory) (orig_bp->pc, orig_bp->old_data, | |
158 | breakpoint_len); | |
159 | orig_bp->reinserting = 1; | |
160 | } | |
161 | ||
162 | void | |
163 | uninsert_breakpoint (CORE_ADDR stopped_at) | |
164 | { | |
165 | struct breakpoint *bp; | |
166 | ||
167 | bp = find_breakpoint_at (stopped_at); | |
168 | if (bp == NULL) | |
169 | error ("Could not find breakpoint in list (uninserting)."); | |
170 | ||
171 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
172 | breakpoint_len); | |
173 | bp->reinserting = 1; | |
174 | } | |
175 | ||
176 | void | |
177 | reinsert_breakpoint (CORE_ADDR stopped_at) | |
178 | { | |
179 | struct breakpoint *bp; | |
180 | ||
181 | bp = find_breakpoint_at (stopped_at); | |
182 | if (bp == NULL) | |
183 | error ("Could not find breakpoint in list (uninserting)."); | |
184 | if (! bp->reinserting) | |
185 | error ("Breakpoint already inserted at reinsert time."); | |
186 | ||
187 | (*the_target->write_memory) (bp->pc, breakpoint_data, | |
188 | breakpoint_len); | |
189 | bp->reinserting = 0; | |
190 | } | |
191 | ||
192 | int | |
193 | check_breakpoints (CORE_ADDR stop_pc) | |
194 | { | |
195 | struct breakpoint *bp; | |
196 | ||
197 | bp = find_breakpoint_at (stop_pc); | |
198 | if (bp == NULL) | |
199 | return 0; | |
200 | if (bp->reinserting) | |
201 | { | |
202 | warning ("Hit a removed breakpoint?"); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | (*bp->handler) (bp->pc); | |
207 | return 1; | |
208 | } | |
209 | ||
210 | void | |
f450004a | 211 | set_breakpoint_data (const unsigned char *bp_data, int bp_len) |
611cb4a5 DJ |
212 | { |
213 | breakpoint_data = bp_data; | |
214 | breakpoint_len = bp_len; | |
215 | } | |
216 | ||
217 | void | |
f450004a | 218 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 DJ |
219 | { |
220 | struct breakpoint *bp = breakpoints; | |
221 | CORE_ADDR mem_end = mem_addr + mem_len; | |
222 | ||
223 | for (; bp != NULL; bp = bp->next) | |
224 | { | |
225 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
226 | CORE_ADDR start, end; | |
227 | int copy_offset, copy_len, buf_offset; | |
228 | ||
229 | if (mem_addr >= bp_end) | |
230 | continue; | |
231 | if (bp->pc >= mem_end) | |
232 | continue; | |
233 | ||
234 | start = bp->pc; | |
235 | if (mem_addr > start) | |
236 | start = mem_addr; | |
237 | ||
238 | end = bp_end; | |
239 | if (end > mem_end) | |
240 | end = mem_end; | |
241 | ||
242 | copy_len = end - start; | |
243 | copy_offset = start - bp->pc; | |
244 | buf_offset = start - mem_addr; | |
245 | ||
246 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); | |
247 | } | |
248 | } | |
249 | ||
250 | void | |
f450004a | 251 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 DJ |
252 | { |
253 | struct breakpoint *bp = breakpoints; | |
254 | CORE_ADDR mem_end = mem_addr + mem_len; | |
255 | ||
256 | for (; bp != NULL; bp = bp->next) | |
257 | { | |
258 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
259 | CORE_ADDR start, end; | |
260 | int copy_offset, copy_len, buf_offset; | |
261 | ||
262 | if (mem_addr >= bp_end) | |
263 | continue; | |
264 | if (bp->pc >= mem_end) | |
265 | continue; | |
266 | ||
267 | start = bp->pc; | |
268 | if (mem_addr > start) | |
269 | start = mem_addr; | |
270 | ||
271 | end = bp_end; | |
272 | if (end > mem_end) | |
273 | end = mem_end; | |
274 | ||
275 | copy_len = end - start; | |
276 | copy_offset = start - bp->pc; | |
277 | buf_offset = start - mem_addr; | |
278 | ||
279 | memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len); | |
280 | if (bp->reinserting == 0) | |
281 | memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len); | |
282 | } | |
283 | } | |
ae13219e DJ |
284 | |
285 | /* Delete all breakpoints. */ | |
286 | ||
287 | void | |
288 | delete_all_breakpoints (void) | |
289 | { | |
290 | while (breakpoints) | |
291 | delete_breakpoint (breakpoints); | |
292 | } |