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611cb4a5 | 1 | /* Memory breakpoint operations for the remote server for GDB. |
7b6bb8da | 2 | Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011 |
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 | ||
8b07ae33 PA |
29 | /* GDB will never try to install multiple breakpoints at the same |
30 | address. But, we need to keep track of internal breakpoints too, | |
31 | and so we do need to be able to install multiple breakpoints at the | |
32 | same address transparently. We keep track of two different, and | |
33 | closely related structures. A raw breakpoint, which manages the | |
34 | low level, close to the metal aspect of a breakpoint. It holds the | |
35 | breakpoint address, and a buffer holding a copy of the instructions | |
36 | that would be in memory had not been a breakpoint there (we call | |
37 | that the shadow memory of the breakpoint). We occasionally need to | |
38 | temporarilly uninsert a breakpoint without the client knowing about | |
39 | it (e.g., to step over an internal breakpoint), so we keep an | |
40 | `inserted' state associated with this low level breakpoint | |
41 | structure. There can only be one such object for a given address. | |
42 | Then, we have (a bit higher level) breakpoints. This structure | |
43 | holds a callback to be called whenever a breakpoint is hit, a | |
44 | high-level type, and a link to a low level raw breakpoint. There | |
45 | can be many high-level breakpoints at the same address, and all of | |
46 | them will point to the same raw breakpoint, which is reference | |
47 | counted. */ | |
48 | ||
49 | /* The low level, physical, raw breakpoint. */ | |
50 | struct raw_breakpoint | |
51 | { | |
52 | struct raw_breakpoint *next; | |
53 | ||
54 | /* A reference count. Each high level breakpoint referencing this | |
55 | raw breakpoint accounts for one reference. */ | |
56 | int refcount; | |
57 | ||
58 | /* The breakpoint's insertion address. There can only be one raw | |
59 | breakpoint for a given PC. */ | |
60 | CORE_ADDR pc; | |
61 | ||
62 | /* The breakpoint's shadow memory. */ | |
63 | unsigned char old_data[MAX_BREAKPOINT_LEN]; | |
64 | ||
65 | /* Non-zero if this breakpoint is currently inserted in the | |
66 | inferior. */ | |
67 | int inserted; | |
d3bbe7a0 PA |
68 | |
69 | /* Non-zero if this breakpoint is currently disabled because we no | |
70 | longer detect it as inserted. */ | |
71 | int shlib_disabled; | |
8b07ae33 PA |
72 | }; |
73 | ||
414a389f PA |
74 | /* The type of a breakpoint. */ |
75 | enum bkpt_type | |
76 | { | |
8b07ae33 PA |
77 | /* A GDB breakpoint, requested with a Z0 packet. */ |
78 | gdb_breakpoint, | |
79 | ||
414a389f PA |
80 | /* A basic-software-single-step breakpoint. */ |
81 | reinsert_breakpoint, | |
82 | ||
83 | /* Any other breakpoint type that doesn't require specific | |
84 | treatment goes here. E.g., an event breakpoint. */ | |
85 | other_breakpoint, | |
86 | }; | |
87 | ||
8b07ae33 | 88 | /* A high level (in gdbserver's perspective) breakpoint. */ |
611cb4a5 DJ |
89 | struct breakpoint |
90 | { | |
91 | struct breakpoint *next; | |
611cb4a5 | 92 | |
414a389f PA |
93 | /* The breakpoint's type. */ |
94 | enum bkpt_type type; | |
95 | ||
8b07ae33 PA |
96 | /* Link to this breakpoint's raw breakpoint. This is always |
97 | non-NULL. */ | |
98 | struct raw_breakpoint *raw; | |
99 | ||
b65d95c5 | 100 | /* Function to call when we hit this breakpoint. If it returns 1, |
8b07ae33 PA |
101 | the breakpoint shall be deleted; 0 or if this callback is NULL, |
102 | it will be left inserted. */ | |
b65d95c5 | 103 | int (*handler) (CORE_ADDR); |
611cb4a5 DJ |
104 | }; |
105 | ||
8b07ae33 PA |
106 | static struct raw_breakpoint * |
107 | find_raw_breakpoint_at (CORE_ADDR where) | |
108 | { | |
109 | struct process_info *proc = current_process (); | |
110 | struct raw_breakpoint *bp; | |
414a389f | 111 | |
8b07ae33 PA |
112 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
113 | if (bp->pc == where) | |
114 | return bp; | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
119 | static struct raw_breakpoint * | |
d50171e4 | 120 | set_raw_breakpoint_at (CORE_ADDR where) |
611cb4a5 | 121 | { |
95954743 | 122 | struct process_info *proc = current_process (); |
8b07ae33 | 123 | struct raw_breakpoint *bp; |
d50171e4 | 124 | int err; |
611cb4a5 DJ |
125 | |
126 | if (breakpoint_data == NULL) | |
127 | error ("Target does not support breakpoints."); | |
128 | ||
8b07ae33 PA |
129 | bp = find_raw_breakpoint_at (where); |
130 | if (bp != NULL) | |
131 | { | |
132 | bp->refcount++; | |
133 | return bp; | |
134 | } | |
135 | ||
d50171e4 PA |
136 | bp = xcalloc (1, sizeof (*bp)); |
137 | bp->pc = where; | |
8b07ae33 | 138 | bp->refcount = 1; |
611cb4a5 | 139 | |
fa593d66 PA |
140 | /* Note that there can be fast tracepoint jumps installed in the |
141 | same memory range, so to get at the original memory, we need to | |
142 | use read_inferior_memory, which masks those out. */ | |
143 | err = read_inferior_memory (where, bp->old_data, breakpoint_len); | |
d50171e4 PA |
144 | if (err != 0) |
145 | { | |
146 | if (debug_threads) | |
147 | fprintf (stderr, | |
148 | "Failed to read shadow memory of" | |
149 | " breakpoint at 0x%s (%s).\n", | |
150 | paddress (where), strerror (err)); | |
151 | free (bp); | |
152 | return NULL; | |
153 | } | |
611cb4a5 | 154 | |
d50171e4 PA |
155 | err = (*the_target->write_memory) (where, breakpoint_data, |
156 | breakpoint_len); | |
157 | if (err != 0) | |
158 | { | |
159 | if (debug_threads) | |
160 | fprintf (stderr, | |
161 | "Failed to insert breakpoint at 0x%s (%s).\n", | |
162 | paddress (where), strerror (err)); | |
163 | free (bp); | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* Link the breakpoint in. */ | |
168 | bp->inserted = 1; | |
8b07ae33 PA |
169 | bp->next = proc->raw_breakpoints; |
170 | proc->raw_breakpoints = bp; | |
d50171e4 PA |
171 | return bp; |
172 | } | |
173 | ||
fa593d66 PA |
174 | /* Notice that breakpoint traps are always installed on top of fast |
175 | tracepoint jumps. This is even if the fast tracepoint is installed | |
176 | at a later time compared to when the breakpoint was installed. | |
177 | This means that a stopping breakpoint or tracepoint has higher | |
178 | "priority". In turn, this allows having fast and slow tracepoints | |
179 | (and breakpoints) at the same address behave correctly. */ | |
180 | ||
181 | ||
182 | /* A fast tracepoint jump. */ | |
183 | ||
184 | struct fast_tracepoint_jump | |
185 | { | |
186 | struct fast_tracepoint_jump *next; | |
187 | ||
188 | /* A reference count. GDB can install more than one fast tracepoint | |
189 | at the same address (each with its own action list, for | |
190 | example). */ | |
191 | int refcount; | |
192 | ||
193 | /* The fast tracepoint's insertion address. There can only be one | |
194 | of these for a given PC. */ | |
195 | CORE_ADDR pc; | |
196 | ||
197 | /* Non-zero if this fast tracepoint jump is currently inserted in | |
198 | the inferior. */ | |
199 | int inserted; | |
200 | ||
201 | /* The length of the jump instruction. */ | |
202 | int length; | |
203 | ||
204 | /* A poor-man's flexible array member, holding both the jump | |
205 | instruction to insert, and a copy of the instruction that would | |
206 | be in memory had not been a jump there (the shadow memory of the | |
207 | tracepoint jump). */ | |
208 | unsigned char insn_and_shadow[0]; | |
209 | }; | |
210 | ||
211 | /* Fast tracepoint FP's jump instruction to insert. */ | |
212 | #define fast_tracepoint_jump_insn(fp) \ | |
213 | ((fp)->insn_and_shadow + 0) | |
214 | ||
215 | /* The shadow memory of fast tracepoint jump FP. */ | |
216 | #define fast_tracepoint_jump_shadow(fp) \ | |
217 | ((fp)->insn_and_shadow + (fp)->length) | |
218 | ||
219 | ||
220 | /* Return the fast tracepoint jump set at WHERE. */ | |
221 | ||
222 | static struct fast_tracepoint_jump * | |
223 | find_fast_tracepoint_jump_at (CORE_ADDR where) | |
224 | { | |
225 | struct process_info *proc = current_process (); | |
226 | struct fast_tracepoint_jump *jp; | |
227 | ||
228 | for (jp = proc->fast_tracepoint_jumps; jp != NULL; jp = jp->next) | |
229 | if (jp->pc == where) | |
230 | return jp; | |
231 | ||
232 | return NULL; | |
233 | } | |
234 | ||
235 | int | |
236 | fast_tracepoint_jump_here (CORE_ADDR where) | |
237 | { | |
238 | struct fast_tracepoint_jump *jp = find_fast_tracepoint_jump_at (where); | |
239 | ||
240 | return (jp != NULL); | |
241 | } | |
242 | ||
243 | int | |
244 | delete_fast_tracepoint_jump (struct fast_tracepoint_jump *todel) | |
245 | { | |
246 | struct fast_tracepoint_jump *bp, **bp_link; | |
247 | int ret; | |
248 | struct process_info *proc = current_process (); | |
249 | ||
250 | bp = proc->fast_tracepoint_jumps; | |
251 | bp_link = &proc->fast_tracepoint_jumps; | |
252 | ||
253 | while (bp) | |
254 | { | |
255 | if (bp == todel) | |
256 | { | |
257 | if (--bp->refcount == 0) | |
258 | { | |
259 | struct fast_tracepoint_jump *prev_bp_link = *bp_link; | |
260 | ||
261 | /* Unlink it. */ | |
262 | *bp_link = bp->next; | |
263 | ||
264 | /* Since there can be breakpoints inserted in the same | |
265 | address range, we use `write_inferior_memory', which | |
266 | takes care of layering breakpoints on top of fast | |
267 | tracepoints, and on top of the buffer we pass it. | |
268 | This works because we've already unlinked the fast | |
269 | tracepoint jump above. Also note that we need to | |
270 | pass the current shadow contents, because | |
271 | write_inferior_memory updates any shadow memory with | |
272 | what we pass here, and we want that to be a nop. */ | |
273 | ret = write_inferior_memory (bp->pc, | |
274 | fast_tracepoint_jump_shadow (bp), | |
275 | bp->length); | |
276 | if (ret != 0) | |
277 | { | |
278 | /* Something went wrong, relink the jump. */ | |
279 | *bp_link = prev_bp_link; | |
280 | ||
281 | if (debug_threads) | |
282 | fprintf (stderr, | |
283 | "Failed to uninsert fast tracepoint jump " | |
284 | "at 0x%s (%s) while deleting it.\n", | |
285 | paddress (bp->pc), strerror (ret)); | |
286 | return ret; | |
287 | } | |
288 | ||
289 | free (bp); | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | else | |
295 | { | |
296 | bp_link = &bp->next; | |
297 | bp = *bp_link; | |
298 | } | |
299 | } | |
300 | ||
301 | warning ("Could not find fast tracepoint jump in list."); | |
302 | return ENOENT; | |
303 | } | |
304 | ||
5c73ff4e YQ |
305 | void |
306 | inc_ref_fast_tracepoint_jump (struct fast_tracepoint_jump *jp) | |
307 | { | |
308 | jp->refcount++; | |
309 | } | |
310 | ||
fa593d66 PA |
311 | struct fast_tracepoint_jump * |
312 | set_fast_tracepoint_jump (CORE_ADDR where, | |
313 | unsigned char *insn, ULONGEST length) | |
314 | { | |
315 | struct process_info *proc = current_process (); | |
316 | struct fast_tracepoint_jump *jp; | |
317 | int err; | |
318 | ||
319 | /* We refcount fast tracepoint jumps. Check if we already know | |
320 | about a jump at this address. */ | |
321 | jp = find_fast_tracepoint_jump_at (where); | |
322 | if (jp != NULL) | |
323 | { | |
324 | jp->refcount++; | |
325 | return jp; | |
326 | } | |
327 | ||
328 | /* We don't, so create a new object. Double the length, because the | |
329 | flexible array member holds both the jump insn, and the | |
330 | shadow. */ | |
331 | jp = xcalloc (1, sizeof (*jp) + (length * 2)); | |
332 | jp->pc = where; | |
333 | jp->length = length; | |
334 | memcpy (fast_tracepoint_jump_insn (jp), insn, length); | |
335 | jp->refcount = 1; | |
336 | ||
337 | /* Note that there can be trap breakpoints inserted in the same | |
338 | address range. To access the original memory contents, we use | |
339 | `read_inferior_memory', which masks out breakpoints. */ | |
340 | err = read_inferior_memory (where, | |
341 | fast_tracepoint_jump_shadow (jp), jp->length); | |
342 | if (err != 0) | |
343 | { | |
344 | if (debug_threads) | |
345 | fprintf (stderr, | |
346 | "Failed to read shadow memory of" | |
347 | " fast tracepoint at 0x%s (%s).\n", | |
348 | paddress (where), strerror (err)); | |
349 | free (jp); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | /* Link the jump in. */ | |
354 | jp->inserted = 1; | |
355 | jp->next = proc->fast_tracepoint_jumps; | |
356 | proc->fast_tracepoint_jumps = jp; | |
357 | ||
358 | /* Since there can be trap breakpoints inserted in the same address | |
359 | range, we use use `write_inferior_memory', which takes care of | |
360 | layering breakpoints on top of fast tracepoints, on top of the | |
361 | buffer we pass it. This works because we've already linked in | |
362 | the fast tracepoint jump above. Also note that we need to pass | |
363 | the current shadow contents, because write_inferior_memory | |
364 | updates any shadow memory with what we pass here, and we want | |
365 | that to be a nop. */ | |
493e2a69 MS |
366 | err = write_inferior_memory (where, fast_tracepoint_jump_shadow (jp), |
367 | length); | |
fa593d66 PA |
368 | if (err != 0) |
369 | { | |
370 | if (debug_threads) | |
371 | fprintf (stderr, | |
372 | "Failed to insert fast tracepoint jump at 0x%s (%s).\n", | |
373 | paddress (where), strerror (err)); | |
374 | ||
375 | /* Unlink it. */ | |
376 | proc->fast_tracepoint_jumps = jp->next; | |
377 | free (jp); | |
378 | ||
379 | return NULL; | |
380 | } | |
381 | ||
382 | return jp; | |
383 | } | |
384 | ||
385 | void | |
386 | uninsert_fast_tracepoint_jumps_at (CORE_ADDR pc) | |
387 | { | |
388 | struct fast_tracepoint_jump *jp; | |
389 | int err; | |
390 | ||
391 | jp = find_fast_tracepoint_jump_at (pc); | |
392 | if (jp == NULL) | |
393 | { | |
394 | /* This can happen when we remove all breakpoints while handling | |
395 | a step-over. */ | |
396 | if (debug_threads) | |
397 | fprintf (stderr, | |
398 | "Could not find fast tracepoint jump at 0x%s " | |
399 | "in list (uninserting).\n", | |
400 | paddress (pc)); | |
401 | return; | |
402 | } | |
403 | ||
404 | if (jp->inserted) | |
405 | { | |
406 | jp->inserted = 0; | |
407 | ||
408 | /* Since there can be trap breakpoints inserted in the same | |
409 | address range, we use use `write_inferior_memory', which | |
410 | takes care of layering breakpoints on top of fast | |
411 | tracepoints, and on top of the buffer we pass it. This works | |
412 | because we've already marked the fast tracepoint fast | |
413 | tracepoint jump uninserted above. Also note that we need to | |
414 | pass the current shadow contents, because | |
415 | write_inferior_memory updates any shadow memory with what we | |
416 | pass here, and we want that to be a nop. */ | |
417 | err = write_inferior_memory (jp->pc, | |
418 | fast_tracepoint_jump_shadow (jp), | |
419 | jp->length); | |
420 | if (err != 0) | |
421 | { | |
422 | jp->inserted = 1; | |
423 | ||
424 | if (debug_threads) | |
425 | fprintf (stderr, | |
426 | "Failed to uninsert fast tracepoint jump at 0x%s (%s).\n", | |
427 | paddress (pc), strerror (err)); | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | void | |
433 | reinsert_fast_tracepoint_jumps_at (CORE_ADDR where) | |
434 | { | |
435 | struct fast_tracepoint_jump *jp; | |
436 | int err; | |
437 | ||
438 | jp = find_fast_tracepoint_jump_at (where); | |
439 | if (jp == NULL) | |
440 | { | |
441 | /* This can happen when we remove breakpoints when a tracepoint | |
442 | hit causes a tracing stop, while handling a step-over. */ | |
443 | if (debug_threads) | |
444 | fprintf (stderr, | |
445 | "Could not find fast tracepoint jump at 0x%s " | |
446 | "in list (reinserting).\n", | |
447 | paddress (where)); | |
448 | return; | |
449 | } | |
450 | ||
451 | if (jp->inserted) | |
452 | error ("Jump already inserted at reinsert time."); | |
453 | ||
454 | jp->inserted = 1; | |
455 | ||
456 | /* Since there can be trap breakpoints inserted in the same address | |
457 | range, we use `write_inferior_memory', which takes care of | |
458 | layering breakpoints on top of fast tracepoints, and on top of | |
459 | the buffer we pass it. This works because we've already marked | |
460 | the fast tracepoint jump inserted above. Also note that we need | |
461 | to pass the current shadow contents, because | |
462 | write_inferior_memory updates any shadow memory with what we pass | |
463 | here, and we want that to be a nop. */ | |
464 | err = write_inferior_memory (where, | |
465 | fast_tracepoint_jump_shadow (jp), jp->length); | |
466 | if (err != 0) | |
467 | { | |
468 | jp->inserted = 0; | |
469 | ||
470 | if (debug_threads) | |
471 | fprintf (stderr, | |
472 | "Failed to reinsert fast tracepoint jump at 0x%s (%s).\n", | |
473 | paddress (where), strerror (err)); | |
474 | } | |
475 | } | |
476 | ||
414a389f | 477 | struct breakpoint * |
d50171e4 PA |
478 | set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR)) |
479 | { | |
480 | struct process_info *proc = current_process (); | |
481 | struct breakpoint *bp; | |
8b07ae33 | 482 | struct raw_breakpoint *raw; |
d50171e4 | 483 | |
8b07ae33 | 484 | raw = set_raw_breakpoint_at (where); |
d50171e4 | 485 | |
8b07ae33 | 486 | if (raw == NULL) |
d50171e4 PA |
487 | { |
488 | /* warn? */ | |
414a389f | 489 | return NULL; |
d50171e4 PA |
490 | } |
491 | ||
492 | bp = xcalloc (1, sizeof (struct breakpoint)); | |
414a389f | 493 | bp->type = other_breakpoint; |
8b07ae33 PA |
494 | |
495 | bp->raw = raw; | |
611cb4a5 DJ |
496 | bp->handler = handler; |
497 | ||
95954743 PA |
498 | bp->next = proc->breakpoints; |
499 | proc->breakpoints = bp; | |
414a389f PA |
500 | |
501 | return bp; | |
611cb4a5 DJ |
502 | } |
503 | ||
8b07ae33 PA |
504 | static int |
505 | delete_raw_breakpoint (struct process_info *proc, struct raw_breakpoint *todel) | |
506 | { | |
507 | struct raw_breakpoint *bp, **bp_link; | |
508 | int ret; | |
509 | ||
510 | bp = proc->raw_breakpoints; | |
511 | bp_link = &proc->raw_breakpoints; | |
512 | ||
513 | while (bp) | |
514 | { | |
515 | if (bp == todel) | |
516 | { | |
517 | if (bp->inserted) | |
518 | { | |
519 | struct raw_breakpoint *prev_bp_link = *bp_link; | |
520 | ||
521 | *bp_link = bp->next; | |
522 | ||
fa593d66 PA |
523 | /* Since there can be trap breakpoints inserted in the |
524 | same address range, we use `write_inferior_memory', | |
525 | which takes care of layering breakpoints on top of | |
526 | fast tracepoints, and on top of the buffer we pass | |
527 | it. This works because we've already unlinked the | |
528 | fast tracepoint jump above. Also note that we need | |
529 | to pass the current shadow contents, because | |
530 | write_inferior_memory updates any shadow memory with | |
531 | what we pass here, and we want that to be a nop. */ | |
532 | ret = write_inferior_memory (bp->pc, bp->old_data, | |
533 | breakpoint_len); | |
8b07ae33 PA |
534 | if (ret != 0) |
535 | { | |
536 | /* Something went wrong, relink the breakpoint. */ | |
537 | *bp_link = prev_bp_link; | |
538 | ||
539 | if (debug_threads) | |
540 | fprintf (stderr, | |
541 | "Failed to uninsert raw breakpoint " | |
542 | "at 0x%s (%s) while deleting it.\n", | |
543 | paddress (bp->pc), strerror (ret)); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | } | |
548 | else | |
549 | *bp_link = bp->next; | |
550 | ||
551 | free (bp); | |
552 | return 0; | |
553 | } | |
554 | else | |
555 | { | |
556 | bp_link = &bp->next; | |
557 | bp = *bp_link; | |
558 | } | |
559 | } | |
560 | ||
561 | warning ("Could not find raw breakpoint in list."); | |
562 | return ENOENT; | |
563 | } | |
564 | ||
565 | static int | |
566 | release_breakpoint (struct process_info *proc, struct breakpoint *bp) | |
567 | { | |
568 | int newrefcount; | |
569 | int ret; | |
570 | ||
571 | newrefcount = bp->raw->refcount - 1; | |
572 | if (newrefcount == 0) | |
573 | { | |
574 | ret = delete_raw_breakpoint (proc, bp->raw); | |
575 | if (ret != 0) | |
576 | return ret; | |
577 | } | |
578 | else | |
579 | bp->raw->refcount = newrefcount; | |
580 | ||
581 | free (bp); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static int | |
587 | delete_breakpoint_1 (struct process_info *proc, struct breakpoint *todel) | |
611cb4a5 | 588 | { |
414a389f | 589 | struct breakpoint *bp, **bp_link; |
8b07ae33 | 590 | int err; |
611cb4a5 | 591 | |
414a389f PA |
592 | bp = proc->breakpoints; |
593 | bp_link = &proc->breakpoints; | |
594 | ||
595 | while (bp) | |
611cb4a5 | 596 | { |
414a389f | 597 | if (bp == todel) |
611cb4a5 | 598 | { |
414a389f PA |
599 | *bp_link = bp->next; |
600 | ||
8b07ae33 PA |
601 | err = release_breakpoint (proc, bp); |
602 | if (err != 0) | |
603 | return err; | |
604 | ||
605 | bp = *bp_link; | |
606 | return 0; | |
611cb4a5 | 607 | } |
414a389f PA |
608 | else |
609 | { | |
610 | bp_link = &bp->next; | |
611 | bp = *bp_link; | |
612 | } | |
611cb4a5 | 613 | } |
414a389f | 614 | |
611cb4a5 | 615 | warning ("Could not find breakpoint in list."); |
8b07ae33 PA |
616 | return ENOENT; |
617 | } | |
618 | ||
219f2f23 | 619 | int |
8b07ae33 PA |
620 | delete_breakpoint (struct breakpoint *todel) |
621 | { | |
622 | struct process_info *proc = current_process (); | |
623 | return delete_breakpoint_1 (proc, todel); | |
611cb4a5 DJ |
624 | } |
625 | ||
626 | static struct breakpoint * | |
8b07ae33 | 627 | find_gdb_breakpoint_at (CORE_ADDR where) |
611cb4a5 | 628 | { |
95954743 | 629 | struct process_info *proc = current_process (); |
8b07ae33 | 630 | struct breakpoint *bp; |
611cb4a5 | 631 | |
8b07ae33 PA |
632 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
633 | if (bp->type == gdb_breakpoint && bp->raw->pc == where) | |
634 | return bp; | |
611cb4a5 DJ |
635 | |
636 | return NULL; | |
637 | } | |
638 | ||
8b07ae33 PA |
639 | int |
640 | set_gdb_breakpoint_at (CORE_ADDR where) | |
68070c10 | 641 | { |
8b07ae33 PA |
642 | struct breakpoint *bp; |
643 | ||
644 | if (breakpoint_data == NULL) | |
645 | return 1; | |
646 | ||
d3bbe7a0 PA |
647 | /* If we see GDB inserting a second breakpoint at the same address, |
648 | then the first breakpoint must have disappeared due to a shared | |
649 | library unload. On targets where the shared libraries are | |
650 | handled by userspace, like SVR4, for example, GDBserver can't | |
651 | tell if a library was loaded or unloaded. Since we refcount | |
652 | breakpoints, if we didn't do this, we'd just increase the | |
653 | refcount of the previous breakpoint at this address, but the trap | |
654 | was not planted in the inferior anymore, thus the breakpoint | |
655 | would never be hit. */ | |
656 | bp = find_gdb_breakpoint_at (where); | |
657 | if (bp != NULL) | |
658 | { | |
659 | delete_gdb_breakpoint_at (where); | |
660 | ||
661 | /* Might as well validate all other breakpoints. */ | |
662 | validate_breakpoints (); | |
663 | } | |
664 | ||
8b07ae33 PA |
665 | bp = set_breakpoint_at (where, NULL); |
666 | if (bp == NULL) | |
667 | return -1; | |
668 | ||
669 | bp->type = gdb_breakpoint; | |
670 | return 0; | |
671 | } | |
672 | ||
673 | int | |
674 | delete_gdb_breakpoint_at (CORE_ADDR addr) | |
675 | { | |
676 | struct breakpoint *bp; | |
677 | int err; | |
678 | ||
679 | if (breakpoint_data == NULL) | |
680 | return 1; | |
681 | ||
682 | bp = find_gdb_breakpoint_at (addr); | |
683 | if (bp == NULL) | |
684 | return -1; | |
685 | ||
686 | err = delete_breakpoint (bp); | |
687 | if (err) | |
688 | return -1; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | int | |
694 | gdb_breakpoint_here (CORE_ADDR where) | |
695 | { | |
696 | struct breakpoint *bp = find_gdb_breakpoint_at (where); | |
697 | ||
698 | return (bp != NULL); | |
68070c10 PA |
699 | } |
700 | ||
d50171e4 PA |
701 | void |
702 | set_reinsert_breakpoint (CORE_ADDR stop_at) | |
611cb4a5 | 703 | { |
414a389f PA |
704 | struct breakpoint *bp; |
705 | ||
706 | bp = set_breakpoint_at (stop_at, NULL); | |
414a389f | 707 | bp->type = reinsert_breakpoint; |
611cb4a5 DJ |
708 | } |
709 | ||
710 | void | |
d50171e4 | 711 | delete_reinsert_breakpoints (void) |
611cb4a5 | 712 | { |
d50171e4 PA |
713 | struct process_info *proc = current_process (); |
714 | struct breakpoint *bp, **bp_link; | |
611cb4a5 | 715 | |
d50171e4 PA |
716 | bp = proc->breakpoints; |
717 | bp_link = &proc->breakpoints; | |
611cb4a5 | 718 | |
d50171e4 PA |
719 | while (bp) |
720 | { | |
414a389f PA |
721 | if (bp->type == reinsert_breakpoint) |
722 | { | |
723 | *bp_link = bp->next; | |
8b07ae33 | 724 | release_breakpoint (proc, bp); |
414a389f PA |
725 | bp = *bp_link; |
726 | } | |
727 | else | |
728 | { | |
729 | bp_link = &bp->next; | |
730 | bp = *bp_link; | |
731 | } | |
d50171e4 PA |
732 | } |
733 | } | |
b65d95c5 | 734 | |
d50171e4 | 735 | static void |
8b07ae33 | 736 | uninsert_raw_breakpoint (struct raw_breakpoint *bp) |
d50171e4 PA |
737 | { |
738 | if (bp->inserted) | |
739 | { | |
740 | int err; | |
741 | ||
742 | bp->inserted = 0; | |
fa593d66 PA |
743 | /* Since there can be fast tracepoint jumps inserted in the same |
744 | address range, we use `write_inferior_memory', which takes | |
745 | care of layering breakpoints on top of fast tracepoints, and | |
746 | on top of the buffer we pass it. This works because we've | |
747 | already unlinked the fast tracepoint jump above. Also note | |
748 | that we need to pass the current shadow contents, because | |
749 | write_inferior_memory updates any shadow memory with what we | |
750 | pass here, and we want that to be a nop. */ | |
751 | err = write_inferior_memory (bp->pc, bp->old_data, | |
752 | breakpoint_len); | |
d50171e4 PA |
753 | if (err != 0) |
754 | { | |
755 | bp->inserted = 1; | |
611cb4a5 | 756 | |
d50171e4 PA |
757 | if (debug_threads) |
758 | fprintf (stderr, | |
759 | "Failed to uninsert raw breakpoint at 0x%s (%s).\n", | |
760 | paddress (bp->pc), strerror (err)); | |
761 | } | |
762 | } | |
611cb4a5 DJ |
763 | } |
764 | ||
765 | void | |
d50171e4 | 766 | uninsert_breakpoints_at (CORE_ADDR pc) |
611cb4a5 | 767 | { |
8b07ae33 | 768 | struct raw_breakpoint *bp; |
611cb4a5 | 769 | |
8b07ae33 | 770 | bp = find_raw_breakpoint_at (pc); |
611cb4a5 | 771 | if (bp == NULL) |
d50171e4 PA |
772 | { |
773 | /* This can happen when we remove all breakpoints while handling | |
774 | a step-over. */ | |
775 | if (debug_threads) | |
776 | fprintf (stderr, | |
777 | "Could not find breakpoint at 0x%s " | |
778 | "in list (uninserting).\n", | |
779 | paddress (pc)); | |
780 | return; | |
781 | } | |
611cb4a5 | 782 | |
d50171e4 | 783 | if (bp->inserted) |
8b07ae33 | 784 | uninsert_raw_breakpoint (bp); |
611cb4a5 DJ |
785 | } |
786 | ||
0fb4aa4b PA |
787 | void |
788 | uninsert_all_breakpoints (void) | |
789 | { | |
790 | struct process_info *proc = current_process (); | |
791 | struct raw_breakpoint *bp; | |
792 | ||
793 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
794 | if (bp->inserted) | |
795 | uninsert_raw_breakpoint (bp); | |
796 | } | |
797 | ||
d50171e4 | 798 | static void |
8b07ae33 | 799 | reinsert_raw_breakpoint (struct raw_breakpoint *bp) |
611cb4a5 | 800 | { |
d50171e4 | 801 | int err; |
611cb4a5 | 802 | |
d50171e4 | 803 | if (bp->inserted) |
611cb4a5 DJ |
804 | error ("Breakpoint already inserted at reinsert time."); |
805 | ||
d50171e4 PA |
806 | err = (*the_target->write_memory) (bp->pc, breakpoint_data, |
807 | breakpoint_len); | |
808 | if (err == 0) | |
809 | bp->inserted = 1; | |
810 | else if (debug_threads) | |
811 | fprintf (stderr, | |
812 | "Failed to reinsert breakpoint at 0x%s (%s).\n", | |
813 | paddress (bp->pc), strerror (err)); | |
611cb4a5 DJ |
814 | } |
815 | ||
d50171e4 PA |
816 | void |
817 | reinsert_breakpoints_at (CORE_ADDR pc) | |
611cb4a5 | 818 | { |
8b07ae33 | 819 | struct raw_breakpoint *bp; |
611cb4a5 | 820 | |
8b07ae33 | 821 | bp = find_raw_breakpoint_at (pc); |
611cb4a5 | 822 | if (bp == NULL) |
611cb4a5 | 823 | { |
d50171e4 PA |
824 | /* This can happen when we remove all breakpoints while handling |
825 | a step-over. */ | |
826 | if (debug_threads) | |
827 | fprintf (stderr, | |
8b07ae33 | 828 | "Could not find raw breakpoint at 0x%s " |
d50171e4 PA |
829 | "in list (reinserting).\n", |
830 | paddress (pc)); | |
831 | return; | |
611cb4a5 DJ |
832 | } |
833 | ||
414a389f | 834 | reinsert_raw_breakpoint (bp); |
d50171e4 PA |
835 | } |
836 | ||
0fb4aa4b PA |
837 | void |
838 | reinsert_all_breakpoints (void) | |
839 | { | |
840 | struct process_info *proc = current_process (); | |
841 | struct raw_breakpoint *bp; | |
842 | ||
843 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
844 | if (!bp->inserted) | |
845 | reinsert_raw_breakpoint (bp); | |
846 | } | |
847 | ||
d50171e4 PA |
848 | void |
849 | check_breakpoints (CORE_ADDR stop_pc) | |
850 | { | |
851 | struct process_info *proc = current_process (); | |
852 | struct breakpoint *bp, **bp_link; | |
853 | ||
854 | bp = proc->breakpoints; | |
855 | bp_link = &proc->breakpoints; | |
856 | ||
857 | while (bp) | |
b65d95c5 | 858 | { |
8b07ae33 | 859 | if (bp->raw->pc == stop_pc) |
d50171e4 | 860 | { |
8b07ae33 | 861 | if (!bp->raw->inserted) |
d50171e4 PA |
862 | { |
863 | warning ("Hit a removed breakpoint?"); | |
864 | return; | |
865 | } | |
866 | ||
867 | if (bp->handler != NULL && (*bp->handler) (stop_pc)) | |
868 | { | |
869 | *bp_link = bp->next; | |
870 | ||
8b07ae33 | 871 | release_breakpoint (proc, bp); |
d50171e4 PA |
872 | |
873 | bp = *bp_link; | |
874 | continue; | |
875 | } | |
876 | } | |
877 | ||
878 | bp_link = &bp->next; | |
879 | bp = *bp_link; | |
b65d95c5 | 880 | } |
611cb4a5 DJ |
881 | } |
882 | ||
883 | void | |
f450004a | 884 | set_breakpoint_data (const unsigned char *bp_data, int bp_len) |
611cb4a5 DJ |
885 | { |
886 | breakpoint_data = bp_data; | |
887 | breakpoint_len = bp_len; | |
888 | } | |
889 | ||
d50171e4 PA |
890 | int |
891 | breakpoint_here (CORE_ADDR addr) | |
892 | { | |
8b07ae33 | 893 | return (find_raw_breakpoint_at (addr) != NULL); |
d50171e4 PA |
894 | } |
895 | ||
896 | int | |
897 | breakpoint_inserted_here (CORE_ADDR addr) | |
898 | { | |
8b07ae33 | 899 | struct raw_breakpoint *bp; |
d50171e4 | 900 | |
8b07ae33 | 901 | bp = find_raw_breakpoint_at (addr); |
d50171e4 | 902 | |
8b07ae33 | 903 | return (bp != NULL && bp->inserted); |
d50171e4 PA |
904 | } |
905 | ||
d3bbe7a0 PA |
906 | static int |
907 | validate_inserted_breakpoint (struct raw_breakpoint *bp) | |
908 | { | |
909 | unsigned char *buf; | |
910 | int err; | |
911 | ||
912 | gdb_assert (bp->inserted); | |
913 | ||
914 | buf = alloca (breakpoint_len); | |
915 | err = (*the_target->read_memory) (bp->pc, buf, breakpoint_len); | |
916 | if (err || memcmp (buf, breakpoint_data, breakpoint_len) != 0) | |
917 | { | |
918 | /* Tag it as gone. */ | |
919 | bp->inserted = 0; | |
920 | bp->shlib_disabled = 1; | |
921 | return 0; | |
922 | } | |
923 | ||
924 | return 1; | |
925 | } | |
926 | ||
927 | static void | |
928 | delete_disabled_breakpoints (void) | |
929 | { | |
930 | struct process_info *proc = current_process (); | |
931 | struct breakpoint *bp, *next; | |
932 | ||
933 | for (bp = proc->breakpoints; bp != NULL; bp = next) | |
934 | { | |
935 | next = bp->next; | |
936 | if (bp->raw->shlib_disabled) | |
937 | delete_breakpoint_1 (proc, bp); | |
938 | } | |
939 | } | |
940 | ||
941 | /* Check if breakpoints we inserted still appear to be inserted. They | |
942 | may disappear due to a shared library unload, and worse, a new | |
943 | shared library may be reloaded at the same address as the | |
944 | previously unloaded one. If that happens, we should make sure that | |
945 | the shadow memory of the old breakpoints isn't used when reading or | |
946 | writing memory. */ | |
947 | ||
948 | void | |
949 | validate_breakpoints (void) | |
950 | { | |
951 | struct process_info *proc = current_process (); | |
952 | struct breakpoint *bp; | |
953 | ||
954 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) | |
955 | { | |
956 | if (bp->raw->inserted) | |
957 | validate_inserted_breakpoint (bp->raw); | |
958 | } | |
959 | ||
960 | delete_disabled_breakpoints (); | |
961 | } | |
962 | ||
611cb4a5 | 963 | void |
f450004a | 964 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 | 965 | { |
95954743 | 966 | struct process_info *proc = current_process (); |
8b07ae33 | 967 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
fa593d66 | 968 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
611cb4a5 | 969 | CORE_ADDR mem_end = mem_addr + mem_len; |
d3bbe7a0 | 970 | int disabled_one = 0; |
611cb4a5 | 971 | |
fa593d66 PA |
972 | for (; jp != NULL; jp = jp->next) |
973 | { | |
974 | CORE_ADDR bp_end = jp->pc + jp->length; | |
975 | CORE_ADDR start, end; | |
976 | int copy_offset, copy_len, buf_offset; | |
977 | ||
978 | if (mem_addr >= bp_end) | |
979 | continue; | |
980 | if (jp->pc >= mem_end) | |
981 | continue; | |
982 | ||
983 | start = jp->pc; | |
984 | if (mem_addr > start) | |
985 | start = mem_addr; | |
986 | ||
987 | end = bp_end; | |
988 | if (end > mem_end) | |
989 | end = mem_end; | |
990 | ||
991 | copy_len = end - start; | |
992 | copy_offset = start - jp->pc; | |
993 | buf_offset = start - mem_addr; | |
994 | ||
995 | if (jp->inserted) | |
996 | memcpy (buf + buf_offset, | |
997 | fast_tracepoint_jump_shadow (jp) + copy_offset, | |
998 | copy_len); | |
999 | } | |
1000 | ||
611cb4a5 DJ |
1001 | for (; bp != NULL; bp = bp->next) |
1002 | { | |
1003 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
1004 | CORE_ADDR start, end; | |
1005 | int copy_offset, copy_len, buf_offset; | |
1006 | ||
1007 | if (mem_addr >= bp_end) | |
1008 | continue; | |
1009 | if (bp->pc >= mem_end) | |
1010 | continue; | |
1011 | ||
1012 | start = bp->pc; | |
1013 | if (mem_addr > start) | |
1014 | start = mem_addr; | |
1015 | ||
1016 | end = bp_end; | |
1017 | if (end > mem_end) | |
1018 | end = mem_end; | |
1019 | ||
1020 | copy_len = end - start; | |
1021 | copy_offset = start - bp->pc; | |
1022 | buf_offset = start - mem_addr; | |
1023 | ||
8b07ae33 | 1024 | if (bp->inserted) |
d3bbe7a0 PA |
1025 | { |
1026 | if (validate_inserted_breakpoint (bp)) | |
1027 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); | |
1028 | else | |
1029 | disabled_one = 1; | |
1030 | } | |
611cb4a5 | 1031 | } |
d3bbe7a0 PA |
1032 | |
1033 | if (disabled_one) | |
1034 | delete_disabled_breakpoints (); | |
611cb4a5 DJ |
1035 | } |
1036 | ||
1037 | void | |
b9fd1791 PA |
1038 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, |
1039 | const unsigned char *myaddr, int mem_len) | |
611cb4a5 | 1040 | { |
95954743 | 1041 | struct process_info *proc = current_process (); |
8b07ae33 | 1042 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
fa593d66 | 1043 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
611cb4a5 | 1044 | CORE_ADDR mem_end = mem_addr + mem_len; |
d3bbe7a0 | 1045 | int disabled_one = 0; |
611cb4a5 | 1046 | |
fa593d66 PA |
1047 | /* First fast tracepoint jumps, then breakpoint traps on top. */ |
1048 | ||
1049 | for (; jp != NULL; jp = jp->next) | |
1050 | { | |
1051 | CORE_ADDR jp_end = jp->pc + jp->length; | |
1052 | CORE_ADDR start, end; | |
1053 | int copy_offset, copy_len, buf_offset; | |
1054 | ||
1055 | if (mem_addr >= jp_end) | |
1056 | continue; | |
1057 | if (jp->pc >= mem_end) | |
1058 | continue; | |
1059 | ||
1060 | start = jp->pc; | |
1061 | if (mem_addr > start) | |
1062 | start = mem_addr; | |
1063 | ||
1064 | end = jp_end; | |
1065 | if (end > mem_end) | |
1066 | end = mem_end; | |
1067 | ||
1068 | copy_len = end - start; | |
1069 | copy_offset = start - jp->pc; | |
1070 | buf_offset = start - mem_addr; | |
1071 | ||
1072 | memcpy (fast_tracepoint_jump_shadow (jp) + copy_offset, | |
b9fd1791 | 1073 | myaddr + buf_offset, copy_len); |
fa593d66 PA |
1074 | if (jp->inserted) |
1075 | memcpy (buf + buf_offset, | |
1076 | fast_tracepoint_jump_insn (jp) + copy_offset, copy_len); | |
1077 | } | |
1078 | ||
611cb4a5 DJ |
1079 | for (; bp != NULL; bp = bp->next) |
1080 | { | |
1081 | CORE_ADDR bp_end = bp->pc + breakpoint_len; | |
1082 | CORE_ADDR start, end; | |
1083 | int copy_offset, copy_len, buf_offset; | |
1084 | ||
1085 | if (mem_addr >= bp_end) | |
1086 | continue; | |
1087 | if (bp->pc >= mem_end) | |
1088 | continue; | |
1089 | ||
1090 | start = bp->pc; | |
1091 | if (mem_addr > start) | |
1092 | start = mem_addr; | |
1093 | ||
1094 | end = bp_end; | |
1095 | if (end > mem_end) | |
1096 | end = mem_end; | |
1097 | ||
1098 | copy_len = end - start; | |
1099 | copy_offset = start - bp->pc; | |
1100 | buf_offset = start - mem_addr; | |
1101 | ||
b9fd1791 | 1102 | memcpy (bp->old_data + copy_offset, myaddr + buf_offset, copy_len); |
d50171e4 | 1103 | if (bp->inserted) |
d3bbe7a0 PA |
1104 | { |
1105 | if (validate_inserted_breakpoint (bp)) | |
1106 | memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len); | |
1107 | else | |
1108 | disabled_one = 1; | |
1109 | } | |
611cb4a5 | 1110 | } |
d3bbe7a0 PA |
1111 | |
1112 | if (disabled_one) | |
1113 | delete_disabled_breakpoints (); | |
611cb4a5 | 1114 | } |
ae13219e | 1115 | |
95954743 | 1116 | /* Delete all breakpoints, and un-insert them from the inferior. */ |
ae13219e DJ |
1117 | |
1118 | void | |
1119 | delete_all_breakpoints (void) | |
1120 | { | |
95954743 PA |
1121 | struct process_info *proc = current_process (); |
1122 | ||
1123 | while (proc->breakpoints) | |
8b07ae33 | 1124 | delete_breakpoint_1 (proc, proc->breakpoints); |
95954743 PA |
1125 | } |
1126 | ||
f9e39928 | 1127 | /* Clear the "inserted" flag in all breakpoints. */ |
95954743 PA |
1128 | |
1129 | void | |
f9e39928 | 1130 | mark_breakpoints_out (struct process_info *proc) |
95954743 | 1131 | { |
8b07ae33 | 1132 | struct raw_breakpoint *raw_bp; |
95954743 | 1133 | |
8b07ae33 PA |
1134 | for (raw_bp = proc->raw_breakpoints; raw_bp != NULL; raw_bp = raw_bp->next) |
1135 | raw_bp->inserted = 0; | |
f9e39928 PA |
1136 | } |
1137 | ||
1138 | /* Release all breakpoints, but do not try to un-insert them from the | |
1139 | inferior. */ | |
1140 | ||
1141 | void | |
1142 | free_all_breakpoints (struct process_info *proc) | |
1143 | { | |
1144 | mark_breakpoints_out (proc); | |
8b07ae33 PA |
1145 | |
1146 | /* Note: use PROC explicitly instead of deferring to | |
1147 | delete_all_breakpoints --- CURRENT_INFERIOR may already have been | |
1148 | released when we get here. There should be no call to | |
1149 | current_process from here on. */ | |
95954743 | 1150 | while (proc->breakpoints) |
8b07ae33 | 1151 | delete_breakpoint_1 (proc, proc->breakpoints); |
ae13219e | 1152 | } |