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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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
611cb4a5 DJ |
22 | |
23 | #include "server.h" | |
24 | ||
f450004a | 25 | const unsigned char *breakpoint_data; |
611cb4a5 DJ |
26 | int breakpoint_len; |
27 | ||
28 | #define MAX_BREAKPOINT_LEN 8 | |
29 | ||
30 | struct breakpoint | |
31 | { | |
32 | struct breakpoint *next; | |
33 | CORE_ADDR pc; | |
34 | unsigned char old_data[MAX_BREAKPOINT_LEN]; | |
35 | ||
36 | /* Non-zero iff we are stepping over this breakpoint. */ | |
37 | int reinserting; | |
38 | ||
39 | /* Non-NULL iff this breakpoint was inserted to step over | |
40 | another one. Points to the other breakpoint (which is also | |
41 | in the *next chain somewhere). */ | |
42 | struct breakpoint *breakpoint_to_reinsert; | |
43 | ||
44 | /* Function to call when we hit this breakpoint. */ | |
45 | void (*handler) (CORE_ADDR); | |
46 | }; | |
47 | ||
48 | struct breakpoint *breakpoints; | |
49 | ||
50 | void | |
51 | set_breakpoint_at (CORE_ADDR where, void (*handler) (CORE_ADDR)) | |
52 | { | |
53 | struct breakpoint *bp; | |
54 | ||
55 | if (breakpoint_data == NULL) | |
56 | error ("Target does not support breakpoints."); | |
57 | ||
58 | bp = malloc (sizeof (struct breakpoint)); | |
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 | ||
69 | bp->next = breakpoints; | |
70 | breakpoints = bp; | |
71 | } | |
72 | ||
73 | static void | |
74 | delete_breakpoint (struct breakpoint *bp) | |
75 | { | |
76 | struct breakpoint *cur; | |
77 | ||
78 | if (breakpoints == bp) | |
79 | { | |
80 | breakpoints = bp->next; | |
81 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
82 | breakpoint_len); | |
83 | free (bp); | |
84 | return; | |
85 | } | |
86 | cur = breakpoints; | |
87 | while (cur->next) | |
88 | { | |
89 | if (cur->next == bp) | |
90 | { | |
91 | cur->next = bp->next; | |
92 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
93 | breakpoint_len); | |
94 | free (bp); | |
95 | return; | |
96 | } | |
97 | } | |
98 | warning ("Could not find breakpoint in list."); | |
99 | } | |
100 | ||
101 | static struct breakpoint * | |
102 | find_breakpoint_at (CORE_ADDR where) | |
103 | { | |
104 | struct breakpoint *bp = breakpoints; | |
105 | ||
106 | while (bp != NULL) | |
107 | { | |
108 | if (bp->pc == where) | |
109 | return bp; | |
110 | bp = bp->next; | |
111 | } | |
112 | ||
113 | return NULL; | |
114 | } | |
115 | ||
116 | static void | |
117 | reinsert_breakpoint_handler (CORE_ADDR stop_pc) | |
118 | { | |
119 | struct breakpoint *stop_bp, *orig_bp; | |
120 | ||
121 | stop_bp = find_breakpoint_at (stop_pc); | |
122 | if (stop_bp == NULL) | |
123 | error ("lost the stopping breakpoint."); | |
124 | ||
125 | orig_bp = stop_bp->breakpoint_to_reinsert; | |
126 | if (orig_bp == NULL) | |
127 | error ("no breakpoint to reinsert"); | |
128 | ||
129 | (*the_target->write_memory) (orig_bp->pc, breakpoint_data, | |
130 | breakpoint_len); | |
131 | orig_bp->reinserting = 0; | |
132 | delete_breakpoint (stop_bp); | |
133 | } | |
134 | ||
135 | void | |
136 | reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at) | |
137 | { | |
138 | struct breakpoint *bp, *orig_bp; | |
139 | ||
140 | set_breakpoint_at (stop_at, reinsert_breakpoint_handler); | |
141 | ||
fd3a5ca1 | 142 | orig_bp = find_breakpoint_at (stop_pc); |
611cb4a5 DJ |
143 | if (orig_bp == NULL) |
144 | error ("Could not find original breakpoint in list."); | |
145 | ||
146 | bp = find_breakpoint_at (stop_at); | |
147 | if (bp == NULL) | |
148 | error ("Could not find breakpoint in list (reinserting by breakpoint)."); | |
149 | bp->breakpoint_to_reinsert = orig_bp; | |
150 | ||
151 | (*the_target->write_memory) (orig_bp->pc, orig_bp->old_data, | |
152 | breakpoint_len); | |
153 | orig_bp->reinserting = 1; | |
154 | } | |
155 | ||
156 | void | |
157 | uninsert_breakpoint (CORE_ADDR stopped_at) | |
158 | { | |
159 | struct breakpoint *bp; | |
160 | ||
161 | bp = find_breakpoint_at (stopped_at); | |
162 | if (bp == NULL) | |
163 | error ("Could not find breakpoint in list (uninserting)."); | |
164 | ||
165 | (*the_target->write_memory) (bp->pc, bp->old_data, | |
166 | breakpoint_len); | |
167 | bp->reinserting = 1; | |
168 | } | |
169 | ||
170 | void | |
171 | reinsert_breakpoint (CORE_ADDR stopped_at) | |
172 | { | |
173 | struct breakpoint *bp; | |
174 | ||
175 | bp = find_breakpoint_at (stopped_at); | |
176 | if (bp == NULL) | |
177 | error ("Could not find breakpoint in list (uninserting)."); | |
178 | if (! bp->reinserting) | |
179 | error ("Breakpoint already inserted at reinsert time."); | |
180 | ||
181 | (*the_target->write_memory) (bp->pc, breakpoint_data, | |
182 | breakpoint_len); | |
183 | bp->reinserting = 0; | |
184 | } | |
185 | ||
186 | int | |
187 | check_breakpoints (CORE_ADDR stop_pc) | |
188 | { | |
189 | struct breakpoint *bp; | |
190 | ||
191 | bp = find_breakpoint_at (stop_pc); | |
192 | if (bp == NULL) | |
193 | return 0; | |
194 | if (bp->reinserting) | |
195 | { | |
196 | warning ("Hit a removed breakpoint?"); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | (*bp->handler) (bp->pc); | |
201 | return 1; | |
202 | } | |
203 | ||
204 | void | |
f450004a | 205 | set_breakpoint_data (const unsigned char *bp_data, int bp_len) |
611cb4a5 DJ |
206 | { |
207 | breakpoint_data = bp_data; | |
208 | breakpoint_len = bp_len; | |
209 | } | |
210 | ||
211 | void | |
f450004a | 212 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 DJ |
213 | { |
214 | struct breakpoint *bp = breakpoints; | |
215 | CORE_ADDR mem_end = mem_addr + mem_len; | |
216 | ||
217 | for (; bp != NULL; bp = bp->next) | |
218 | { | |
219 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
220 | CORE_ADDR start, end; | |
221 | int copy_offset, copy_len, buf_offset; | |
222 | ||
223 | if (mem_addr >= bp_end) | |
224 | continue; | |
225 | if (bp->pc >= mem_end) | |
226 | continue; | |
227 | ||
228 | start = bp->pc; | |
229 | if (mem_addr > start) | |
230 | start = mem_addr; | |
231 | ||
232 | end = bp_end; | |
233 | if (end > mem_end) | |
234 | end = mem_end; | |
235 | ||
236 | copy_len = end - start; | |
237 | copy_offset = start - bp->pc; | |
238 | buf_offset = start - mem_addr; | |
239 | ||
240 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); | |
241 | } | |
242 | } | |
243 | ||
244 | void | |
f450004a | 245 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 DJ |
246 | { |
247 | struct breakpoint *bp = breakpoints; | |
248 | CORE_ADDR mem_end = mem_addr + mem_len; | |
249 | ||
250 | for (; bp != NULL; bp = bp->next) | |
251 | { | |
252 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
253 | CORE_ADDR start, end; | |
254 | int copy_offset, copy_len, buf_offset; | |
255 | ||
256 | if (mem_addr >= bp_end) | |
257 | continue; | |
258 | if (bp->pc >= mem_end) | |
259 | continue; | |
260 | ||
261 | start = bp->pc; | |
262 | if (mem_addr > start) | |
263 | start = mem_addr; | |
264 | ||
265 | end = bp_end; | |
266 | if (end > mem_end) | |
267 | end = mem_end; | |
268 | ||
269 | copy_len = end - start; | |
270 | copy_offset = start - bp->pc; | |
271 | buf_offset = start - mem_addr; | |
272 | ||
273 | memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len); | |
274 | if (bp->reinserting == 0) | |
275 | memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len); | |
276 | } | |
277 | } |