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611cb4a5 | 1 | /* Memory breakpoint operations for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 2002-2015 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" | |
9f3a5c85 LM |
22 | #include "regcache.h" |
23 | #include "ax.h" | |
611cb4a5 DJ |
24 | |
25 | #define MAX_BREAKPOINT_LEN 8 | |
26 | ||
ddcbc397 DB |
27 | /* Helper macro used in loops that append multiple items to a singly-linked |
28 | list instead of inserting items at the head of the list, as, say, in the | |
29 | breakpoint lists. LISTPP is a pointer to the pointer that is the head of | |
30 | the new list. ITEMP is a pointer to the item to be added to the list. | |
31 | TAILP must be defined to be the same type as ITEMP, and initialized to | |
32 | NULL. */ | |
33 | ||
34 | #define APPEND_TO_LIST(listpp, itemp, tailp) \ | |
35 | do \ | |
36 | { \ | |
37 | if ((tailp) == NULL) \ | |
38 | *(listpp) = (itemp); \ | |
39 | else \ | |
40 | (tailp)->next = (itemp); \ | |
41 | (tailp) = (itemp); \ | |
42 | } \ | |
43 | while (0) | |
44 | ||
8b07ae33 | 45 | /* GDB will never try to install multiple breakpoints at the same |
802e8e6d PA |
46 | address. However, we can see GDB requesting to insert a breakpoint |
47 | at an address is had already inserted one previously in a few | |
48 | situations. | |
49 | ||
50 | - The RSP documentation on Z packets says that to avoid potential | |
51 | problems with duplicate packets, the operations should be | |
52 | implemented in an idempotent way. | |
53 | ||
54 | - A breakpoint is set at ADDR, an address in a shared library. | |
55 | Then the shared library is unloaded. And then another, unrelated, | |
56 | breakpoint at ADDR is set. There is not breakpoint removal request | |
57 | between the first and the second breakpoint. | |
58 | ||
59 | - When GDB wants to update the target-side breakpoint conditions or | |
60 | commands, it re-inserts the breakpoint, with updated | |
61 | conditions/commands associated. | |
62 | ||
63 | Also, we need to keep track of internal breakpoints too, so we do | |
64 | need to be able to install multiple breakpoints at the same address | |
65 | transparently. | |
66 | ||
67 | We keep track of two different, and closely related structures. A | |
68 | raw breakpoint, which manages the low level, close to the metal | |
69 | aspect of a breakpoint. It holds the breakpoint address, and for | |
70 | software breakpoints, a buffer holding a copy of the instructions | |
8b07ae33 PA |
71 | that would be in memory had not been a breakpoint there (we call |
72 | that the shadow memory of the breakpoint). We occasionally need to | |
73 | temporarilly uninsert a breakpoint without the client knowing about | |
74 | it (e.g., to step over an internal breakpoint), so we keep an | |
75 | `inserted' state associated with this low level breakpoint | |
76 | structure. There can only be one such object for a given address. | |
77 | Then, we have (a bit higher level) breakpoints. This structure | |
78 | holds a callback to be called whenever a breakpoint is hit, a | |
79 | high-level type, and a link to a low level raw breakpoint. There | |
80 | can be many high-level breakpoints at the same address, and all of | |
81 | them will point to the same raw breakpoint, which is reference | |
82 | counted. */ | |
83 | ||
84 | /* The low level, physical, raw breakpoint. */ | |
85 | struct raw_breakpoint | |
86 | { | |
87 | struct raw_breakpoint *next; | |
88 | ||
802e8e6d PA |
89 | /* The low level type of the breakpoint (software breakpoint, |
90 | watchpoint, etc.) */ | |
91 | enum raw_bkpt_type raw_type; | |
92 | ||
8b07ae33 PA |
93 | /* A reference count. Each high level breakpoint referencing this |
94 | raw breakpoint accounts for one reference. */ | |
95 | int refcount; | |
96 | ||
97 | /* The breakpoint's insertion address. There can only be one raw | |
98 | breakpoint for a given PC. */ | |
99 | CORE_ADDR pc; | |
100 | ||
27165294 AT |
101 | /* The breakpoint's kind. This is target specific. Most |
102 | architectures only use one specific instruction for breakpoints, while | |
103 | others may use more than one. E.g., on ARM, we need to use different | |
104 | breakpoint instructions on Thumb, Thumb-2, and ARM code. Likewise for | |
105 | hardware breakpoints -- some architectures (including ARM) need to | |
106 | setup debug registers differently depending on mode. */ | |
107 | int kind; | |
802e8e6d | 108 | |
8b07ae33 PA |
109 | /* The breakpoint's shadow memory. */ |
110 | unsigned char old_data[MAX_BREAKPOINT_LEN]; | |
111 | ||
802e8e6d PA |
112 | /* Positive if this breakpoint is currently inserted in the |
113 | inferior. Negative if it was, but we've detected that it's now | |
114 | gone. Zero if not inserted. */ | |
8b07ae33 PA |
115 | int inserted; |
116 | }; | |
117 | ||
414a389f PA |
118 | /* The type of a breakpoint. */ |
119 | enum bkpt_type | |
120 | { | |
8b07ae33 | 121 | /* A GDB breakpoint, requested with a Z0 packet. */ |
802e8e6d PA |
122 | gdb_breakpoint_Z0, |
123 | ||
124 | /* A GDB hardware breakpoint, requested with a Z1 packet. */ | |
125 | gdb_breakpoint_Z1, | |
126 | ||
127 | /* A GDB write watchpoint, requested with a Z2 packet. */ | |
128 | gdb_breakpoint_Z2, | |
129 | ||
130 | /* A GDB read watchpoint, requested with a Z3 packet. */ | |
131 | gdb_breakpoint_Z3, | |
132 | ||
133 | /* A GDB access watchpoint, requested with a Z4 packet. */ | |
134 | gdb_breakpoint_Z4, | |
8b07ae33 | 135 | |
414a389f PA |
136 | /* A basic-software-single-step breakpoint. */ |
137 | reinsert_breakpoint, | |
138 | ||
139 | /* Any other breakpoint type that doesn't require specific | |
140 | treatment goes here. E.g., an event breakpoint. */ | |
141 | other_breakpoint, | |
142 | }; | |
143 | ||
9f3a5c85 LM |
144 | struct point_cond_list |
145 | { | |
146 | /* Pointer to the agent expression that is the breakpoint's | |
147 | conditional. */ | |
148 | struct agent_expr *cond; | |
149 | ||
150 | /* Pointer to the next condition. */ | |
151 | struct point_cond_list *next; | |
152 | }; | |
153 | ||
d3ce09f5 SS |
154 | struct point_command_list |
155 | { | |
156 | /* Pointer to the agent expression that is the breakpoint's | |
157 | commands. */ | |
158 | struct agent_expr *cmd; | |
159 | ||
160 | /* Flag that is true if this command should run even while GDB is | |
161 | disconnected. */ | |
162 | int persistence; | |
163 | ||
164 | /* Pointer to the next command. */ | |
165 | struct point_command_list *next; | |
166 | }; | |
167 | ||
8b07ae33 | 168 | /* A high level (in gdbserver's perspective) breakpoint. */ |
611cb4a5 DJ |
169 | struct breakpoint |
170 | { | |
171 | struct breakpoint *next; | |
611cb4a5 | 172 | |
414a389f PA |
173 | /* The breakpoint's type. */ |
174 | enum bkpt_type type; | |
175 | ||
9f3a5c85 LM |
176 | /* Pointer to the condition list that should be evaluated on |
177 | the target or NULL if the breakpoint is unconditional or | |
178 | if GDB doesn't want us to evaluate the conditionals on the | |
179 | target's side. */ | |
180 | struct point_cond_list *cond_list; | |
181 | ||
d3ce09f5 SS |
182 | /* Point to the list of commands to run when this is hit. */ |
183 | struct point_command_list *command_list; | |
184 | ||
8b07ae33 PA |
185 | /* Link to this breakpoint's raw breakpoint. This is always |
186 | non-NULL. */ | |
187 | struct raw_breakpoint *raw; | |
188 | ||
b65d95c5 | 189 | /* Function to call when we hit this breakpoint. If it returns 1, |
8b07ae33 PA |
190 | the breakpoint shall be deleted; 0 or if this callback is NULL, |
191 | it will be left inserted. */ | |
b65d95c5 | 192 | int (*handler) (CORE_ADDR); |
611cb4a5 DJ |
193 | }; |
194 | ||
27165294 AT |
195 | /* Return the breakpoint size from its kind. */ |
196 | ||
197 | static int | |
198 | bp_size (struct raw_breakpoint *bp) | |
199 | { | |
200 | int size = 0; | |
201 | ||
202 | the_target->sw_breakpoint_from_kind (bp->kind, &size); | |
203 | return size; | |
204 | } | |
205 | ||
206 | /* Return the breakpoint opcode from its kind. */ | |
207 | ||
208 | static const gdb_byte * | |
209 | bp_opcode (struct raw_breakpoint *bp) | |
210 | { | |
211 | int size = 0; | |
212 | ||
213 | return the_target->sw_breakpoint_from_kind (bp->kind, &size); | |
214 | } | |
215 | ||
802e8e6d PA |
216 | /* See mem-break.h. */ |
217 | ||
932539e3 | 218 | enum target_hw_bp_type |
802e8e6d | 219 | raw_bkpt_type_to_target_hw_bp_type (enum raw_bkpt_type raw_type) |
932539e3 | 220 | { |
802e8e6d | 221 | switch (raw_type) |
932539e3 | 222 | { |
802e8e6d | 223 | case raw_bkpt_type_hw: |
932539e3 | 224 | return hw_execute; |
802e8e6d | 225 | case raw_bkpt_type_write_wp: |
932539e3 | 226 | return hw_write; |
802e8e6d | 227 | case raw_bkpt_type_read_wp: |
932539e3 | 228 | return hw_read; |
802e8e6d | 229 | case raw_bkpt_type_access_wp: |
932539e3 PA |
230 | return hw_access; |
231 | default: | |
38e08fca GB |
232 | internal_error (__FILE__, __LINE__, |
233 | "bad raw breakpoint type %d", (int) raw_type); | |
802e8e6d PA |
234 | } |
235 | } | |
236 | ||
237 | /* See mem-break.h. */ | |
238 | ||
239 | static enum bkpt_type | |
240 | Z_packet_to_bkpt_type (char z_type) | |
241 | { | |
242 | gdb_assert ('0' <= z_type && z_type <= '4'); | |
243 | ||
d2412fa5 | 244 | return (enum bkpt_type) (gdb_breakpoint_Z0 + (z_type - '0')); |
802e8e6d PA |
245 | } |
246 | ||
247 | /* See mem-break.h. */ | |
248 | ||
249 | enum raw_bkpt_type | |
250 | Z_packet_to_raw_bkpt_type (char z_type) | |
251 | { | |
252 | switch (z_type) | |
253 | { | |
254 | case Z_PACKET_SW_BP: | |
255 | return raw_bkpt_type_sw; | |
256 | case Z_PACKET_HW_BP: | |
257 | return raw_bkpt_type_hw; | |
258 | case Z_PACKET_WRITE_WP: | |
259 | return raw_bkpt_type_write_wp; | |
260 | case Z_PACKET_READ_WP: | |
261 | return raw_bkpt_type_read_wp; | |
262 | case Z_PACKET_ACCESS_WP: | |
263 | return raw_bkpt_type_access_wp; | |
264 | default: | |
265 | gdb_assert_not_reached ("unhandled Z packet type."); | |
932539e3 PA |
266 | } |
267 | } | |
268 | ||
d3ce09f5 SS |
269 | int |
270 | any_persistent_commands () | |
271 | { | |
272 | struct process_info *proc = current_process (); | |
273 | struct breakpoint *bp; | |
274 | struct point_command_list *cl; | |
275 | ||
276 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) | |
277 | { | |
278 | for (cl = bp->command_list; cl != NULL; cl = cl->next) | |
279 | if (cl->persistence) | |
280 | return 1; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
802e8e6d PA |
286 | /* Find low-level breakpoint of type TYPE at address ADDR that is not |
287 | insert-disabled. Returns NULL if not found. */ | |
288 | ||
8b07ae33 | 289 | static struct raw_breakpoint * |
802e8e6d | 290 | find_enabled_raw_code_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type) |
8b07ae33 PA |
291 | { |
292 | struct process_info *proc = current_process (); | |
293 | struct raw_breakpoint *bp; | |
414a389f | 294 | |
8b07ae33 | 295 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
802e8e6d PA |
296 | if (bp->pc == addr |
297 | && bp->raw_type == type | |
298 | && bp->inserted >= 0) | |
8b07ae33 PA |
299 | return bp; |
300 | ||
301 | return NULL; | |
302 | } | |
303 | ||
802e8e6d PA |
304 | /* Find low-level breakpoint of type TYPE at address ADDR. Returns |
305 | NULL if not found. */ | |
306 | ||
8b07ae33 | 307 | static struct raw_breakpoint * |
27165294 | 308 | find_raw_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type, int kind) |
611cb4a5 | 309 | { |
95954743 | 310 | struct process_info *proc = current_process (); |
8b07ae33 | 311 | struct raw_breakpoint *bp; |
802e8e6d PA |
312 | |
313 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
27165294 | 314 | if (bp->pc == addr && bp->raw_type == type && bp->kind == kind) |
802e8e6d PA |
315 | return bp; |
316 | ||
317 | return NULL; | |
318 | } | |
319 | ||
320 | /* See mem-break.h. */ | |
321 | ||
322 | int | |
323 | insert_memory_breakpoint (struct raw_breakpoint *bp) | |
324 | { | |
6bf36717 | 325 | unsigned char buf[MAX_BREAKPOINT_LEN]; |
802e8e6d | 326 | int err; |
611cb4a5 | 327 | |
fa593d66 PA |
328 | /* Note that there can be fast tracepoint jumps installed in the |
329 | same memory range, so to get at the original memory, we need to | |
330 | use read_inferior_memory, which masks those out. */ | |
27165294 | 331 | err = read_inferior_memory (bp->pc, buf, bp_size (bp)); |
d50171e4 PA |
332 | if (err != 0) |
333 | { | |
334 | if (debug_threads) | |
87ce2a04 DE |
335 | debug_printf ("Failed to read shadow memory of" |
336 | " breakpoint at 0x%s (%s).\n", | |
802e8e6d | 337 | paddress (bp->pc), strerror (err)); |
d50171e4 | 338 | } |
802e8e6d PA |
339 | else |
340 | { | |
27165294 | 341 | memcpy (bp->old_data, buf, bp_size (bp)); |
611cb4a5 | 342 | |
27165294 AT |
343 | err = (*the_target->write_memory) (bp->pc, bp_opcode (bp), |
344 | bp_size (bp)); | |
802e8e6d PA |
345 | if (err != 0) |
346 | { | |
347 | if (debug_threads) | |
348 | debug_printf ("Failed to insert breakpoint at 0x%s (%s).\n", | |
349 | paddress (bp->pc), strerror (err)); | |
350 | } | |
351 | } | |
352 | return err != 0 ? -1 : 0; | |
353 | } | |
354 | ||
355 | /* See mem-break.h */ | |
356 | ||
357 | int | |
358 | remove_memory_breakpoint (struct raw_breakpoint *bp) | |
359 | { | |
360 | unsigned char buf[MAX_BREAKPOINT_LEN]; | |
361 | int err; | |
362 | ||
363 | /* Since there can be trap breakpoints inserted in the same address | |
364 | range, we use `write_inferior_memory', which takes care of | |
365 | layering breakpoints on top of fast tracepoints, and on top of | |
366 | the buffer we pass it. This works because the caller has already | |
367 | either unlinked the breakpoint or marked it uninserted. Also | |
368 | note that we need to pass the current shadow contents, because | |
369 | write_inferior_memory updates any shadow memory with what we pass | |
370 | here, and we want that to be a nop. */ | |
27165294 AT |
371 | memcpy (buf, bp->old_data, bp_size (bp)); |
372 | err = write_inferior_memory (bp->pc, buf, bp_size (bp)); | |
d50171e4 PA |
373 | if (err != 0) |
374 | { | |
375 | if (debug_threads) | |
802e8e6d PA |
376 | debug_printf ("Failed to uninsert raw breakpoint " |
377 | "at 0x%s (%s) while deleting it.\n", | |
378 | paddress (bp->pc), strerror (err)); | |
379 | } | |
380 | return err != 0 ? -1 : 0; | |
381 | } | |
382 | ||
27165294 | 383 | /* Set a RAW breakpoint of type TYPE and kind KIND at WHERE. On |
802e8e6d PA |
384 | success, a pointer to the new breakpoint is returned. On failure, |
385 | returns NULL and writes the error code to *ERR. */ | |
386 | ||
387 | static struct raw_breakpoint * | |
27165294 | 388 | set_raw_breakpoint_at (enum raw_bkpt_type type, CORE_ADDR where, int kind, |
802e8e6d PA |
389 | int *err) |
390 | { | |
391 | struct process_info *proc = current_process (); | |
392 | struct raw_breakpoint *bp; | |
393 | ||
394 | if (type == raw_bkpt_type_sw || type == raw_bkpt_type_hw) | |
395 | { | |
396 | bp = find_enabled_raw_code_breakpoint_at (where, type); | |
27165294 | 397 | if (bp != NULL && bp->kind != kind) |
802e8e6d | 398 | { |
27165294 | 399 | /* A different kind than previously seen. The previous |
802e8e6d PA |
400 | breakpoint must be gone then. */ |
401 | if (debug_threads) | |
27165294 AT |
402 | debug_printf ("Inconsistent breakpoint kind? Was %d, now %d.\n", |
403 | bp->kind, kind); | |
802e8e6d PA |
404 | bp->inserted = -1; |
405 | bp = NULL; | |
406 | } | |
407 | } | |
408 | else | |
27165294 | 409 | bp = find_raw_breakpoint_at (where, type, kind); |
802e8e6d PA |
410 | |
411 | if (bp != NULL) | |
412 | { | |
413 | bp->refcount++; | |
414 | return bp; | |
415 | } | |
416 | ||
8d749320 | 417 | bp = XCNEW (struct raw_breakpoint); |
802e8e6d | 418 | bp->pc = where; |
27165294 | 419 | bp->kind = kind; |
802e8e6d PA |
420 | bp->refcount = 1; |
421 | bp->raw_type = type; | |
422 | ||
27165294 | 423 | *err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp); |
802e8e6d PA |
424 | if (*err != 0) |
425 | { | |
426 | if (debug_threads) | |
427 | debug_printf ("Failed to insert breakpoint at 0x%s (%d).\n", | |
428 | paddress (where), *err); | |
d50171e4 PA |
429 | free (bp); |
430 | return NULL; | |
431 | } | |
432 | ||
d50171e4 | 433 | bp->inserted = 1; |
802e8e6d | 434 | /* Link the breakpoint in. */ |
8b07ae33 PA |
435 | bp->next = proc->raw_breakpoints; |
436 | proc->raw_breakpoints = bp; | |
d50171e4 PA |
437 | return bp; |
438 | } | |
439 | ||
fa593d66 PA |
440 | /* Notice that breakpoint traps are always installed on top of fast |
441 | tracepoint jumps. This is even if the fast tracepoint is installed | |
442 | at a later time compared to when the breakpoint was installed. | |
443 | This means that a stopping breakpoint or tracepoint has higher | |
444 | "priority". In turn, this allows having fast and slow tracepoints | |
445 | (and breakpoints) at the same address behave correctly. */ | |
446 | ||
447 | ||
448 | /* A fast tracepoint jump. */ | |
449 | ||
450 | struct fast_tracepoint_jump | |
451 | { | |
452 | struct fast_tracepoint_jump *next; | |
453 | ||
454 | /* A reference count. GDB can install more than one fast tracepoint | |
455 | at the same address (each with its own action list, for | |
456 | example). */ | |
457 | int refcount; | |
458 | ||
459 | /* The fast tracepoint's insertion address. There can only be one | |
460 | of these for a given PC. */ | |
461 | CORE_ADDR pc; | |
462 | ||
463 | /* Non-zero if this fast tracepoint jump is currently inserted in | |
464 | the inferior. */ | |
465 | int inserted; | |
466 | ||
467 | /* The length of the jump instruction. */ | |
468 | int length; | |
469 | ||
470 | /* A poor-man's flexible array member, holding both the jump | |
471 | instruction to insert, and a copy of the instruction that would | |
472 | be in memory had not been a jump there (the shadow memory of the | |
473 | tracepoint jump). */ | |
474 | unsigned char insn_and_shadow[0]; | |
475 | }; | |
476 | ||
477 | /* Fast tracepoint FP's jump instruction to insert. */ | |
478 | #define fast_tracepoint_jump_insn(fp) \ | |
479 | ((fp)->insn_and_shadow + 0) | |
480 | ||
481 | /* The shadow memory of fast tracepoint jump FP. */ | |
482 | #define fast_tracepoint_jump_shadow(fp) \ | |
483 | ((fp)->insn_and_shadow + (fp)->length) | |
484 | ||
485 | ||
486 | /* Return the fast tracepoint jump set at WHERE. */ | |
487 | ||
488 | static struct fast_tracepoint_jump * | |
489 | find_fast_tracepoint_jump_at (CORE_ADDR where) | |
490 | { | |
491 | struct process_info *proc = current_process (); | |
492 | struct fast_tracepoint_jump *jp; | |
493 | ||
494 | for (jp = proc->fast_tracepoint_jumps; jp != NULL; jp = jp->next) | |
495 | if (jp->pc == where) | |
496 | return jp; | |
497 | ||
498 | return NULL; | |
499 | } | |
500 | ||
501 | int | |
502 | fast_tracepoint_jump_here (CORE_ADDR where) | |
503 | { | |
504 | struct fast_tracepoint_jump *jp = find_fast_tracepoint_jump_at (where); | |
505 | ||
506 | return (jp != NULL); | |
507 | } | |
508 | ||
509 | int | |
510 | delete_fast_tracepoint_jump (struct fast_tracepoint_jump *todel) | |
511 | { | |
512 | struct fast_tracepoint_jump *bp, **bp_link; | |
513 | int ret; | |
514 | struct process_info *proc = current_process (); | |
515 | ||
516 | bp = proc->fast_tracepoint_jumps; | |
517 | bp_link = &proc->fast_tracepoint_jumps; | |
518 | ||
519 | while (bp) | |
520 | { | |
521 | if (bp == todel) | |
522 | { | |
523 | if (--bp->refcount == 0) | |
524 | { | |
525 | struct fast_tracepoint_jump *prev_bp_link = *bp_link; | |
6bf36717 | 526 | unsigned char *buf; |
fa593d66 PA |
527 | |
528 | /* Unlink it. */ | |
529 | *bp_link = bp->next; | |
530 | ||
531 | /* Since there can be breakpoints inserted in the same | |
532 | address range, we use `write_inferior_memory', which | |
533 | takes care of layering breakpoints on top of fast | |
534 | tracepoints, and on top of the buffer we pass it. | |
535 | This works because we've already unlinked the fast | |
536 | tracepoint jump above. Also note that we need to | |
537 | pass the current shadow contents, because | |
538 | write_inferior_memory updates any shadow memory with | |
539 | what we pass here, and we want that to be a nop. */ | |
224c3ddb | 540 | buf = (unsigned char *) alloca (bp->length); |
6bf36717 JK |
541 | memcpy (buf, fast_tracepoint_jump_shadow (bp), bp->length); |
542 | ret = write_inferior_memory (bp->pc, buf, bp->length); | |
fa593d66 PA |
543 | if (ret != 0) |
544 | { | |
545 | /* Something went wrong, relink the jump. */ | |
546 | *bp_link = prev_bp_link; | |
547 | ||
548 | if (debug_threads) | |
87ce2a04 DE |
549 | debug_printf ("Failed to uninsert fast tracepoint jump " |
550 | "at 0x%s (%s) while deleting it.\n", | |
551 | paddress (bp->pc), strerror (ret)); | |
fa593d66 PA |
552 | return ret; |
553 | } | |
554 | ||
555 | free (bp); | |
556 | } | |
557 | ||
558 | return 0; | |
559 | } | |
560 | else | |
561 | { | |
562 | bp_link = &bp->next; | |
563 | bp = *bp_link; | |
564 | } | |
565 | } | |
566 | ||
567 | warning ("Could not find fast tracepoint jump in list."); | |
568 | return ENOENT; | |
569 | } | |
570 | ||
5c73ff4e YQ |
571 | void |
572 | inc_ref_fast_tracepoint_jump (struct fast_tracepoint_jump *jp) | |
573 | { | |
574 | jp->refcount++; | |
575 | } | |
576 | ||
fa593d66 PA |
577 | struct fast_tracepoint_jump * |
578 | set_fast_tracepoint_jump (CORE_ADDR where, | |
579 | unsigned char *insn, ULONGEST length) | |
580 | { | |
581 | struct process_info *proc = current_process (); | |
582 | struct fast_tracepoint_jump *jp; | |
583 | int err; | |
6bf36717 | 584 | unsigned char *buf; |
fa593d66 PA |
585 | |
586 | /* We refcount fast tracepoint jumps. Check if we already know | |
587 | about a jump at this address. */ | |
588 | jp = find_fast_tracepoint_jump_at (where); | |
589 | if (jp != NULL) | |
590 | { | |
591 | jp->refcount++; | |
592 | return jp; | |
593 | } | |
594 | ||
595 | /* We don't, so create a new object. Double the length, because the | |
596 | flexible array member holds both the jump insn, and the | |
597 | shadow. */ | |
224c3ddb | 598 | jp = (struct fast_tracepoint_jump *) xcalloc (1, sizeof (*jp) + (length * 2)); |
fa593d66 PA |
599 | jp->pc = where; |
600 | jp->length = length; | |
601 | memcpy (fast_tracepoint_jump_insn (jp), insn, length); | |
602 | jp->refcount = 1; | |
224c3ddb | 603 | buf = (unsigned char *) alloca (length); |
fa593d66 PA |
604 | |
605 | /* Note that there can be trap breakpoints inserted in the same | |
606 | address range. To access the original memory contents, we use | |
607 | `read_inferior_memory', which masks out breakpoints. */ | |
6bf36717 | 608 | err = read_inferior_memory (where, buf, length); |
fa593d66 PA |
609 | if (err != 0) |
610 | { | |
611 | if (debug_threads) | |
87ce2a04 DE |
612 | debug_printf ("Failed to read shadow memory of" |
613 | " fast tracepoint at 0x%s (%s).\n", | |
614 | paddress (where), strerror (err)); | |
fa593d66 PA |
615 | free (jp); |
616 | return NULL; | |
617 | } | |
6bf36717 | 618 | memcpy (fast_tracepoint_jump_shadow (jp), buf, length); |
fa593d66 PA |
619 | |
620 | /* Link the jump in. */ | |
621 | jp->inserted = 1; | |
622 | jp->next = proc->fast_tracepoint_jumps; | |
623 | proc->fast_tracepoint_jumps = jp; | |
624 | ||
625 | /* Since there can be trap breakpoints inserted in the same address | |
626 | range, we use use `write_inferior_memory', which takes care of | |
627 | layering breakpoints on top of fast tracepoints, on top of the | |
628 | buffer we pass it. This works because we've already linked in | |
629 | the fast tracepoint jump above. Also note that we need to pass | |
630 | the current shadow contents, because write_inferior_memory | |
631 | updates any shadow memory with what we pass here, and we want | |
632 | that to be a nop. */ | |
6bf36717 | 633 | err = write_inferior_memory (where, buf, length); |
fa593d66 PA |
634 | if (err != 0) |
635 | { | |
636 | if (debug_threads) | |
87ce2a04 DE |
637 | debug_printf ("Failed to insert fast tracepoint jump at 0x%s (%s).\n", |
638 | paddress (where), strerror (err)); | |
fa593d66 PA |
639 | |
640 | /* Unlink it. */ | |
641 | proc->fast_tracepoint_jumps = jp->next; | |
642 | free (jp); | |
643 | ||
644 | return NULL; | |
645 | } | |
646 | ||
647 | return jp; | |
648 | } | |
649 | ||
650 | void | |
651 | uninsert_fast_tracepoint_jumps_at (CORE_ADDR pc) | |
652 | { | |
653 | struct fast_tracepoint_jump *jp; | |
654 | int err; | |
655 | ||
656 | jp = find_fast_tracepoint_jump_at (pc); | |
657 | if (jp == NULL) | |
658 | { | |
659 | /* This can happen when we remove all breakpoints while handling | |
660 | a step-over. */ | |
661 | if (debug_threads) | |
87ce2a04 DE |
662 | debug_printf ("Could not find fast tracepoint jump at 0x%s " |
663 | "in list (uninserting).\n", | |
664 | paddress (pc)); | |
fa593d66 PA |
665 | return; |
666 | } | |
667 | ||
668 | if (jp->inserted) | |
669 | { | |
6bf36717 JK |
670 | unsigned char *buf; |
671 | ||
fa593d66 PA |
672 | jp->inserted = 0; |
673 | ||
674 | /* Since there can be trap breakpoints inserted in the same | |
675 | address range, we use use `write_inferior_memory', which | |
676 | takes care of layering breakpoints on top of fast | |
677 | tracepoints, and on top of the buffer we pass it. This works | |
678 | because we've already marked the fast tracepoint fast | |
679 | tracepoint jump uninserted above. Also note that we need to | |
680 | pass the current shadow contents, because | |
681 | write_inferior_memory updates any shadow memory with what we | |
682 | pass here, and we want that to be a nop. */ | |
224c3ddb | 683 | buf = (unsigned char *) alloca (jp->length); |
6bf36717 JK |
684 | memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length); |
685 | err = write_inferior_memory (jp->pc, buf, jp->length); | |
fa593d66 PA |
686 | if (err != 0) |
687 | { | |
688 | jp->inserted = 1; | |
689 | ||
690 | if (debug_threads) | |
87ce2a04 DE |
691 | debug_printf ("Failed to uninsert fast tracepoint jump at" |
692 | " 0x%s (%s).\n", | |
693 | paddress (pc), strerror (err)); | |
fa593d66 PA |
694 | } |
695 | } | |
696 | } | |
697 | ||
698 | void | |
699 | reinsert_fast_tracepoint_jumps_at (CORE_ADDR where) | |
700 | { | |
701 | struct fast_tracepoint_jump *jp; | |
702 | int err; | |
6bf36717 | 703 | unsigned char *buf; |
fa593d66 PA |
704 | |
705 | jp = find_fast_tracepoint_jump_at (where); | |
706 | if (jp == NULL) | |
707 | { | |
708 | /* This can happen when we remove breakpoints when a tracepoint | |
709 | hit causes a tracing stop, while handling a step-over. */ | |
710 | if (debug_threads) | |
87ce2a04 DE |
711 | debug_printf ("Could not find fast tracepoint jump at 0x%s " |
712 | "in list (reinserting).\n", | |
713 | paddress (where)); | |
fa593d66 PA |
714 | return; |
715 | } | |
716 | ||
717 | if (jp->inserted) | |
718 | error ("Jump already inserted at reinsert time."); | |
719 | ||
720 | jp->inserted = 1; | |
721 | ||
722 | /* Since there can be trap breakpoints inserted in the same address | |
723 | range, we use `write_inferior_memory', which takes care of | |
724 | layering breakpoints on top of fast tracepoints, and on top of | |
725 | the buffer we pass it. This works because we've already marked | |
726 | the fast tracepoint jump inserted above. Also note that we need | |
727 | to pass the current shadow contents, because | |
728 | write_inferior_memory updates any shadow memory with what we pass | |
729 | here, and we want that to be a nop. */ | |
224c3ddb | 730 | buf = (unsigned char *) alloca (jp->length); |
6bf36717 JK |
731 | memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length); |
732 | err = write_inferior_memory (where, buf, jp->length); | |
fa593d66 PA |
733 | if (err != 0) |
734 | { | |
735 | jp->inserted = 0; | |
736 | ||
737 | if (debug_threads) | |
87ce2a04 DE |
738 | debug_printf ("Failed to reinsert fast tracepoint jump at" |
739 | " 0x%s (%s).\n", | |
740 | paddress (where), strerror (err)); | |
fa593d66 PA |
741 | } |
742 | } | |
743 | ||
802e8e6d | 744 | /* Set a high-level breakpoint of type TYPE, with low level type |
27165294 | 745 | RAW_TYPE and kind KIND, at WHERE. On success, a pointer to the new |
802e8e6d PA |
746 | breakpoint is returned. On failure, returns NULL and writes the |
747 | error code to *ERR. HANDLER is called when the breakpoint is hit. | |
748 | HANDLER should return 1 if the breakpoint should be deleted, 0 | |
749 | otherwise. */ | |
750 | ||
751 | static struct breakpoint * | |
752 | set_breakpoint (enum bkpt_type type, enum raw_bkpt_type raw_type, | |
27165294 | 753 | CORE_ADDR where, int kind, |
802e8e6d | 754 | int (*handler) (CORE_ADDR), int *err) |
d50171e4 PA |
755 | { |
756 | struct process_info *proc = current_process (); | |
757 | struct breakpoint *bp; | |
8b07ae33 | 758 | struct raw_breakpoint *raw; |
d50171e4 | 759 | |
27165294 | 760 | raw = set_raw_breakpoint_at (raw_type, where, kind, err); |
d50171e4 | 761 | |
8b07ae33 | 762 | if (raw == NULL) |
d50171e4 PA |
763 | { |
764 | /* warn? */ | |
414a389f | 765 | return NULL; |
d50171e4 PA |
766 | } |
767 | ||
8d749320 | 768 | bp = XCNEW (struct breakpoint); |
802e8e6d | 769 | bp->type = type; |
8b07ae33 PA |
770 | |
771 | bp->raw = raw; | |
611cb4a5 DJ |
772 | bp->handler = handler; |
773 | ||
95954743 PA |
774 | bp->next = proc->breakpoints; |
775 | proc->breakpoints = bp; | |
414a389f PA |
776 | |
777 | return bp; | |
611cb4a5 DJ |
778 | } |
779 | ||
802e8e6d PA |
780 | /* See mem-break.h */ |
781 | ||
782 | struct breakpoint * | |
783 | set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR)) | |
784 | { | |
785 | int err_ignored; | |
27165294 | 786 | CORE_ADDR placed_address = where; |
2e6ee069 | 787 | int breakpoint_kind = target_breakpoint_kind_from_pc (&placed_address); |
802e8e6d PA |
788 | |
789 | return set_breakpoint (other_breakpoint, raw_bkpt_type_sw, | |
27165294 | 790 | placed_address, breakpoint_kind, handler, |
802e8e6d PA |
791 | &err_ignored); |
792 | } | |
793 | ||
794 | ||
8b07ae33 PA |
795 | static int |
796 | delete_raw_breakpoint (struct process_info *proc, struct raw_breakpoint *todel) | |
797 | { | |
798 | struct raw_breakpoint *bp, **bp_link; | |
799 | int ret; | |
800 | ||
801 | bp = proc->raw_breakpoints; | |
802 | bp_link = &proc->raw_breakpoints; | |
803 | ||
804 | while (bp) | |
805 | { | |
806 | if (bp == todel) | |
807 | { | |
802e8e6d | 808 | if (bp->inserted > 0) |
8b07ae33 PA |
809 | { |
810 | struct raw_breakpoint *prev_bp_link = *bp_link; | |
811 | ||
812 | *bp_link = bp->next; | |
813 | ||
27165294 | 814 | ret = the_target->remove_point (bp->raw_type, bp->pc, bp->kind, |
802e8e6d | 815 | bp); |
8b07ae33 PA |
816 | if (ret != 0) |
817 | { | |
818 | /* Something went wrong, relink the breakpoint. */ | |
819 | *bp_link = prev_bp_link; | |
820 | ||
821 | if (debug_threads) | |
87ce2a04 | 822 | debug_printf ("Failed to uninsert raw breakpoint " |
802e8e6d PA |
823 | "at 0x%s while deleting it.\n", |
824 | paddress (bp->pc)); | |
8b07ae33 PA |
825 | return ret; |
826 | } | |
8b07ae33 PA |
827 | } |
828 | else | |
829 | *bp_link = bp->next; | |
830 | ||
831 | free (bp); | |
832 | return 0; | |
833 | } | |
834 | else | |
835 | { | |
836 | bp_link = &bp->next; | |
837 | bp = *bp_link; | |
838 | } | |
839 | } | |
840 | ||
841 | warning ("Could not find raw breakpoint in list."); | |
842 | return ENOENT; | |
843 | } | |
844 | ||
845 | static int | |
846 | release_breakpoint (struct process_info *proc, struct breakpoint *bp) | |
847 | { | |
848 | int newrefcount; | |
849 | int ret; | |
850 | ||
851 | newrefcount = bp->raw->refcount - 1; | |
852 | if (newrefcount == 0) | |
853 | { | |
854 | ret = delete_raw_breakpoint (proc, bp->raw); | |
855 | if (ret != 0) | |
856 | return ret; | |
857 | } | |
858 | else | |
859 | bp->raw->refcount = newrefcount; | |
860 | ||
861 | free (bp); | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | static int | |
867 | delete_breakpoint_1 (struct process_info *proc, struct breakpoint *todel) | |
611cb4a5 | 868 | { |
414a389f | 869 | struct breakpoint *bp, **bp_link; |
8b07ae33 | 870 | int err; |
611cb4a5 | 871 | |
414a389f PA |
872 | bp = proc->breakpoints; |
873 | bp_link = &proc->breakpoints; | |
874 | ||
875 | while (bp) | |
611cb4a5 | 876 | { |
414a389f | 877 | if (bp == todel) |
611cb4a5 | 878 | { |
414a389f PA |
879 | *bp_link = bp->next; |
880 | ||
8b07ae33 PA |
881 | err = release_breakpoint (proc, bp); |
882 | if (err != 0) | |
883 | return err; | |
884 | ||
885 | bp = *bp_link; | |
886 | return 0; | |
611cb4a5 | 887 | } |
414a389f PA |
888 | else |
889 | { | |
890 | bp_link = &bp->next; | |
891 | bp = *bp_link; | |
892 | } | |
611cb4a5 | 893 | } |
414a389f | 894 | |
611cb4a5 | 895 | warning ("Could not find breakpoint in list."); |
8b07ae33 PA |
896 | return ENOENT; |
897 | } | |
898 | ||
219f2f23 | 899 | int |
8b07ae33 PA |
900 | delete_breakpoint (struct breakpoint *todel) |
901 | { | |
902 | struct process_info *proc = current_process (); | |
903 | return delete_breakpoint_1 (proc, todel); | |
611cb4a5 DJ |
904 | } |
905 | ||
27165294 AT |
906 | /* Locate a GDB breakpoint of type Z_TYPE and kind KIND placed at |
907 | address ADDR and return a pointer to its structure. If KIND is -1, | |
908 | the breakpoint's kind is ignored. */ | |
51aa91f9 PA |
909 | |
910 | static struct breakpoint * | |
27165294 | 911 | find_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind) |
611cb4a5 | 912 | { |
95954743 | 913 | struct process_info *proc = current_process (); |
8b07ae33 | 914 | struct breakpoint *bp; |
802e8e6d | 915 | enum bkpt_type type = Z_packet_to_bkpt_type (z_type); |
611cb4a5 | 916 | |
8b07ae33 | 917 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
802e8e6d | 918 | if (bp->type == type && bp->raw->pc == addr |
27165294 | 919 | && (kind == -1 || bp->raw->kind == kind)) |
8b07ae33 | 920 | return bp; |
611cb4a5 DJ |
921 | |
922 | return NULL; | |
923 | } | |
924 | ||
802e8e6d PA |
925 | static int |
926 | z_type_supported (char z_type) | |
927 | { | |
928 | return (z_type >= '0' && z_type <= '4' | |
ef7cab6b | 929 | && the_target->supports_z_point_type != NULL |
802e8e6d PA |
930 | && the_target->supports_z_point_type (z_type)); |
931 | } | |
932 | ||
27165294 | 933 | /* Create a new GDB breakpoint of type Z_TYPE at ADDR with kind KIND. |
802e8e6d PA |
934 | Returns a pointer to the newly created breakpoint on success. On |
935 | failure returns NULL and sets *ERR to either -1 for error, or 1 if | |
936 | Z_TYPE breakpoints are not supported on this target. */ | |
937 | ||
938 | static struct breakpoint * | |
27165294 | 939 | set_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind, int *err) |
68070c10 | 940 | { |
8b07ae33 | 941 | struct breakpoint *bp; |
802e8e6d PA |
942 | enum bkpt_type type; |
943 | enum raw_bkpt_type raw_type; | |
944 | ||
945 | /* If we see GDB inserting a second code breakpoint at the same | |
946 | address, then either: GDB is updating the breakpoint's conditions | |
947 | or commands; or, the first breakpoint must have disappeared due | |
948 | to a shared library unload. On targets where the shared | |
949 | libraries are handled by userspace, like SVR4, for example, | |
950 | GDBserver can't tell if a library was loaded or unloaded. Since | |
951 | we refcount raw breakpoints, we must be careful to make sure GDB | |
952 | breakpoints never contribute more than one reference. if we | |
953 | didn't do this, in case the previous breakpoint is gone due to a | |
954 | shared library unload, we'd just increase the refcount of the | |
955 | previous breakpoint at this address, but the trap was not planted | |
956 | in the inferior anymore, thus the breakpoint would never be hit. | |
957 | Note this must be careful to not create a window where | |
958 | breakpoints are removed from the target, for non-stop, in case | |
959 | the target can poke at memory while the program is running. */ | |
960 | if (z_type == Z_PACKET_SW_BP | |
961 | || z_type == Z_PACKET_HW_BP) | |
962 | { | |
963 | bp = find_gdb_breakpoint (z_type, addr, -1); | |
8b07ae33 | 964 | |
802e8e6d PA |
965 | if (bp != NULL) |
966 | { | |
27165294 | 967 | if (bp->raw->kind != kind) |
802e8e6d | 968 | { |
27165294 | 969 | /* A different kind than previously seen. The previous |
802e8e6d PA |
970 | breakpoint must be gone then. */ |
971 | bp->raw->inserted = -1; | |
972 | delete_breakpoint (bp); | |
973 | bp = NULL; | |
974 | } | |
975 | else if (z_type == Z_PACKET_SW_BP) | |
976 | { | |
977 | /* Check if the breakpoint is actually gone from the | |
978 | target, due to an solib unload, for example. Might | |
979 | as well validate _all_ breakpoints. */ | |
980 | validate_breakpoints (); | |
981 | ||
982 | /* Breakpoints that don't pass validation are | |
983 | deleted. */ | |
984 | bp = find_gdb_breakpoint (z_type, addr, -1); | |
985 | } | |
986 | } | |
987 | } | |
988 | else | |
989 | { | |
27165294 | 990 | /* Data breakpoints for the same address but different kind are |
802e8e6d PA |
991 | expected. GDB doesn't merge these. The backend gets to do |
992 | that if it wants/can. */ | |
27165294 | 993 | bp = find_gdb_breakpoint (z_type, addr, kind); |
802e8e6d | 994 | } |
8b07ae33 | 995 | |
d3bbe7a0 PA |
996 | if (bp != NULL) |
997 | { | |
802e8e6d PA |
998 | /* We already know about this breakpoint, there's nothing else |
999 | to do - GDB's reference is already accounted for. Note that | |
1000 | whether the breakpoint inserted is left as is - we may be | |
1001 | stepping over it, for example, in which case we don't want to | |
1002 | force-reinsert it. */ | |
1003 | return bp; | |
1004 | } | |
1005 | ||
1006 | raw_type = Z_packet_to_raw_bkpt_type (z_type); | |
1007 | type = Z_packet_to_bkpt_type (z_type); | |
27165294 | 1008 | return set_breakpoint (type, raw_type, addr, kind, NULL, err); |
802e8e6d PA |
1009 | } |
1010 | ||
1011 | static int | |
1012 | check_gdb_bp_preconditions (char z_type, int *err) | |
1013 | { | |
1014 | /* As software/memory breakpoints work by poking at memory, we need | |
1015 | to prepare to access memory. If that operation fails, we need to | |
1016 | return error. Seeing an error, if this is the first breakpoint | |
1017 | of that type that GDB tries to insert, GDB would then assume the | |
1018 | breakpoint type is supported, but it may actually not be. So we | |
1019 | need to check whether the type is supported at all before | |
1020 | preparing to access memory. */ | |
1021 | if (!z_type_supported (z_type)) | |
1022 | { | |
1023 | *err = 1; | |
1024 | return 0; | |
1025 | } | |
0bfdf32f | 1026 | else if (current_thread == NULL) |
802e8e6d PA |
1027 | { |
1028 | *err = -1; | |
1029 | return 0; | |
1030 | } | |
1031 | else | |
1032 | return 1; | |
1033 | } | |
1034 | ||
1035 | /* See mem-break.h. This is a wrapper for set_gdb_breakpoint_1 that | |
1036 | knows to prepare to access memory for Z0 breakpoints. */ | |
d3bbe7a0 | 1037 | |
802e8e6d | 1038 | struct breakpoint * |
27165294 | 1039 | set_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind, int *err) |
802e8e6d PA |
1040 | { |
1041 | struct breakpoint *bp; | |
1042 | ||
1043 | if (!check_gdb_bp_preconditions (z_type, err)) | |
1044 | return NULL; | |
1045 | ||
1046 | /* If inserting a software/memory breakpoint, need to prepare to | |
1047 | access memory. */ | |
1048 | if (z_type == Z_PACKET_SW_BP) | |
1049 | { | |
1050 | *err = prepare_to_access_memory (); | |
1051 | if (*err != 0) | |
1052 | return NULL; | |
d3bbe7a0 PA |
1053 | } |
1054 | ||
27165294 | 1055 | bp = set_gdb_breakpoint_1 (z_type, addr, kind, err); |
8b07ae33 | 1056 | |
802e8e6d PA |
1057 | if (z_type == Z_PACKET_SW_BP) |
1058 | done_accessing_memory (); | |
1059 | ||
1060 | return bp; | |
8b07ae33 PA |
1061 | } |
1062 | ||
27165294 | 1063 | /* Delete a GDB breakpoint of type Z_TYPE and kind KIND previously |
802e8e6d PA |
1064 | inserted at ADDR with set_gdb_breakpoint_at. Returns 0 on success, |
1065 | -1 on error, and 1 if Z_TYPE breakpoints are not supported on this | |
1066 | target. */ | |
1067 | ||
1068 | static int | |
27165294 | 1069 | delete_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind) |
8b07ae33 PA |
1070 | { |
1071 | struct breakpoint *bp; | |
1072 | int err; | |
1073 | ||
27165294 | 1074 | bp = find_gdb_breakpoint (z_type, addr, kind); |
8b07ae33 PA |
1075 | if (bp == NULL) |
1076 | return -1; | |
1077 | ||
0a261ed8 PA |
1078 | /* Before deleting the breakpoint, make sure to free its condition |
1079 | and command lists. */ | |
1080 | clear_breakpoint_conditions_and_commands (bp); | |
8b07ae33 | 1081 | err = delete_breakpoint (bp); |
802e8e6d | 1082 | if (err != 0) |
8b07ae33 PA |
1083 | return -1; |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
802e8e6d PA |
1088 | /* See mem-break.h. This is a wrapper for delete_gdb_breakpoint that |
1089 | knows to prepare to access memory for Z0 breakpoints. */ | |
1090 | ||
1091 | int | |
27165294 | 1092 | delete_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind) |
802e8e6d PA |
1093 | { |
1094 | int ret; | |
1095 | ||
1096 | if (!check_gdb_bp_preconditions (z_type, &ret)) | |
1097 | return ret; | |
1098 | ||
1099 | /* If inserting a software/memory breakpoint, need to prepare to | |
1100 | access memory. */ | |
1101 | if (z_type == Z_PACKET_SW_BP) | |
1102 | { | |
1103 | int err; | |
1104 | ||
1105 | err = prepare_to_access_memory (); | |
1106 | if (err != 0) | |
1107 | return -1; | |
1108 | } | |
1109 | ||
27165294 | 1110 | ret = delete_gdb_breakpoint_1 (z_type, addr, kind); |
802e8e6d PA |
1111 | |
1112 | if (z_type == Z_PACKET_SW_BP) | |
1113 | done_accessing_memory (); | |
1114 | ||
1115 | return ret; | |
1116 | } | |
1117 | ||
1118 | /* Clear all conditions associated with a breakpoint. */ | |
9f3a5c85 | 1119 | |
0a261ed8 | 1120 | static void |
802e8e6d | 1121 | clear_breakpoint_conditions (struct breakpoint *bp) |
9f3a5c85 | 1122 | { |
412c89dd | 1123 | struct point_cond_list *cond; |
9f3a5c85 | 1124 | |
802e8e6d | 1125 | if (bp->cond_list == NULL) |
9f3a5c85 LM |
1126 | return; |
1127 | ||
1128 | cond = bp->cond_list; | |
9f3a5c85 LM |
1129 | |
1130 | while (cond != NULL) | |
1131 | { | |
412c89dd LM |
1132 | struct point_cond_list *cond_next; |
1133 | ||
1134 | cond_next = cond->next; | |
0a261ed8 | 1135 | gdb_free_agent_expr (cond->cond); |
9f3a5c85 | 1136 | free (cond); |
412c89dd | 1137 | cond = cond_next; |
9f3a5c85 LM |
1138 | } |
1139 | ||
1140 | bp->cond_list = NULL; | |
1141 | } | |
1142 | ||
0a261ed8 PA |
1143 | /* Clear all commands associated with a breakpoint. */ |
1144 | ||
1145 | static void | |
1146 | clear_breakpoint_commands (struct breakpoint *bp) | |
1147 | { | |
1148 | struct point_command_list *cmd; | |
1149 | ||
1150 | if (bp->command_list == NULL) | |
1151 | return; | |
1152 | ||
1153 | cmd = bp->command_list; | |
1154 | ||
1155 | while (cmd != NULL) | |
1156 | { | |
1157 | struct point_command_list *cmd_next; | |
1158 | ||
1159 | cmd_next = cmd->next; | |
1160 | gdb_free_agent_expr (cmd->cmd); | |
1161 | free (cmd); | |
1162 | cmd = cmd_next; | |
1163 | } | |
1164 | ||
1165 | bp->command_list = NULL; | |
1166 | } | |
1167 | ||
1168 | void | |
1169 | clear_breakpoint_conditions_and_commands (struct breakpoint *bp) | |
1170 | { | |
1171 | clear_breakpoint_conditions (bp); | |
1172 | clear_breakpoint_commands (bp); | |
1173 | } | |
1174 | ||
9f3a5c85 LM |
1175 | /* Add condition CONDITION to GDBserver's breakpoint BP. */ |
1176 | ||
802e8e6d | 1177 | static void |
9f3a5c85 LM |
1178 | add_condition_to_breakpoint (struct breakpoint *bp, |
1179 | struct agent_expr *condition) | |
1180 | { | |
1181 | struct point_cond_list *new_cond; | |
1182 | ||
1183 | /* Create new condition. */ | |
8d749320 | 1184 | new_cond = XCNEW (struct point_cond_list); |
9f3a5c85 LM |
1185 | new_cond->cond = condition; |
1186 | ||
1187 | /* Add condition to the list. */ | |
1188 | new_cond->next = bp->cond_list; | |
1189 | bp->cond_list = new_cond; | |
1190 | } | |
1191 | ||
802e8e6d | 1192 | /* Add a target-side condition CONDITION to a breakpoint. */ |
9f3a5c85 | 1193 | |
8b07ae33 | 1194 | int |
802e8e6d | 1195 | add_breakpoint_condition (struct breakpoint *bp, char **condition) |
9f3a5c85 | 1196 | { |
9f3a5c85 LM |
1197 | char *actparm = *condition; |
1198 | struct agent_expr *cond; | |
1199 | ||
9f3a5c85 LM |
1200 | if (condition == NULL) |
1201 | return 1; | |
1202 | ||
d708bcd1 PA |
1203 | if (bp == NULL) |
1204 | return 0; | |
1205 | ||
9f3a5c85 LM |
1206 | cond = gdb_parse_agent_expr (&actparm); |
1207 | ||
1208 | if (cond == NULL) | |
1209 | { | |
1210 | fprintf (stderr, "Condition evaluation failed. " | |
1211 | "Assuming unconditional.\n"); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | add_condition_to_breakpoint (bp, cond); | |
1216 | ||
1217 | *condition = actparm; | |
1218 | ||
d708bcd1 | 1219 | return 1; |
9f3a5c85 LM |
1220 | } |
1221 | ||
1222 | /* Evaluate condition (if any) at breakpoint BP. Return 1 if | |
1223 | true and 0 otherwise. */ | |
1224 | ||
802e8e6d PA |
1225 | static int |
1226 | gdb_condition_true_at_breakpoint_z_type (char z_type, CORE_ADDR addr) | |
8b07ae33 | 1227 | { |
9f3a5c85 | 1228 | /* Fetch registers for the current inferior. */ |
802e8e6d | 1229 | struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
9f3a5c85 LM |
1230 | ULONGEST value = 0; |
1231 | struct point_cond_list *cl; | |
1232 | int err = 0; | |
5ae4861a | 1233 | struct eval_agent_expr_context ctx; |
9f3a5c85 LM |
1234 | |
1235 | if (bp == NULL) | |
1236 | return 0; | |
8b07ae33 | 1237 | |
9f3a5c85 LM |
1238 | /* Check if the breakpoint is unconditional. If it is, |
1239 | the condition always evaluates to TRUE. */ | |
1240 | if (bp->cond_list == NULL) | |
1241 | return 1; | |
1242 | ||
0bfdf32f | 1243 | ctx.regcache = get_thread_regcache (current_thread, 1); |
5ae4861a YQ |
1244 | ctx.tframe = NULL; |
1245 | ctx.tpoint = NULL; | |
1246 | ||
9f3a5c85 LM |
1247 | /* Evaluate each condition in the breakpoint's list of conditions. |
1248 | Return true if any of the conditions evaluates to TRUE. | |
1249 | ||
1250 | If we failed to evaluate the expression, TRUE is returned. This | |
1251 | forces GDB to reevaluate the conditions. */ | |
1252 | for (cl = bp->cond_list; | |
1253 | cl && !value && !err; cl = cl->next) | |
1254 | { | |
1255 | /* Evaluate the condition. */ | |
5ae4861a | 1256 | err = gdb_eval_agent_expr (&ctx, cl->cond, &value); |
9f3a5c85 LM |
1257 | } |
1258 | ||
1259 | if (err) | |
1260 | return 1; | |
1261 | ||
1262 | return (value != 0); | |
1263 | } | |
1264 | ||
802e8e6d PA |
1265 | int |
1266 | gdb_condition_true_at_breakpoint (CORE_ADDR where) | |
1267 | { | |
1268 | /* Only check code (software or hardware) breakpoints. */ | |
1269 | return (gdb_condition_true_at_breakpoint_z_type (Z_PACKET_SW_BP, where) | |
1270 | || gdb_condition_true_at_breakpoint_z_type (Z_PACKET_HW_BP, where)); | |
1271 | } | |
1272 | ||
d3ce09f5 SS |
1273 | /* Add commands COMMANDS to GDBserver's breakpoint BP. */ |
1274 | ||
1275 | void | |
1276 | add_commands_to_breakpoint (struct breakpoint *bp, | |
1277 | struct agent_expr *commands, int persist) | |
1278 | { | |
1279 | struct point_command_list *new_cmd; | |
1280 | ||
1281 | /* Create new command. */ | |
8d749320 | 1282 | new_cmd = XCNEW (struct point_command_list); |
d3ce09f5 SS |
1283 | new_cmd->cmd = commands; |
1284 | new_cmd->persistence = persist; | |
1285 | ||
1286 | /* Add commands to the list. */ | |
1287 | new_cmd->next = bp->command_list; | |
1288 | bp->command_list = new_cmd; | |
1289 | } | |
1290 | ||
1291 | /* Add a target-side command COMMAND to the breakpoint at ADDR. */ | |
1292 | ||
1293 | int | |
802e8e6d PA |
1294 | add_breakpoint_commands (struct breakpoint *bp, char **command, |
1295 | int persist) | |
d3ce09f5 | 1296 | { |
d3ce09f5 SS |
1297 | char *actparm = *command; |
1298 | struct agent_expr *cmd; | |
1299 | ||
d3ce09f5 SS |
1300 | if (command == NULL) |
1301 | return 1; | |
1302 | ||
d708bcd1 PA |
1303 | if (bp == NULL) |
1304 | return 0; | |
1305 | ||
d3ce09f5 SS |
1306 | cmd = gdb_parse_agent_expr (&actparm); |
1307 | ||
1308 | if (cmd == NULL) | |
1309 | { | |
1310 | fprintf (stderr, "Command evaluation failed. " | |
1311 | "Disabling.\n"); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | add_commands_to_breakpoint (bp, cmd, persist); | |
1316 | ||
1317 | *command = actparm; | |
1318 | ||
d708bcd1 | 1319 | return 1; |
d3ce09f5 SS |
1320 | } |
1321 | ||
1322 | /* Return true if there are no commands to run at this location, | |
1323 | which likely means we want to report back to GDB. */ | |
802e8e6d PA |
1324 | |
1325 | static int | |
1326 | gdb_no_commands_at_breakpoint_z_type (char z_type, CORE_ADDR addr) | |
d3ce09f5 | 1327 | { |
802e8e6d | 1328 | struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
d3ce09f5 SS |
1329 | |
1330 | if (bp == NULL) | |
802e8e6d | 1331 | return 1; |
d3ce09f5 SS |
1332 | |
1333 | if (debug_threads) | |
802e8e6d PA |
1334 | debug_printf ("at 0x%s, type Z%c, bp command_list is 0x%s\n", |
1335 | paddress (addr), z_type, | |
87ce2a04 | 1336 | phex_nz ((uintptr_t) bp->command_list, 0)); |
d3ce09f5 SS |
1337 | return (bp->command_list == NULL); |
1338 | } | |
1339 | ||
802e8e6d PA |
1340 | /* Return true if there are no commands to run at this location, |
1341 | which likely means we want to report back to GDB. */ | |
1342 | ||
1343 | int | |
1344 | gdb_no_commands_at_breakpoint (CORE_ADDR where) | |
1345 | { | |
1346 | /* Only check code (software or hardware) breakpoints. */ | |
1347 | return (gdb_no_commands_at_breakpoint_z_type (Z_PACKET_SW_BP, where) | |
1348 | && gdb_no_commands_at_breakpoint_z_type (Z_PACKET_HW_BP, where)); | |
1349 | } | |
1350 | ||
1351 | /* Run a breakpoint's commands. Returns 0 if there was a problem | |
1352 | running any command, 1 otherwise. */ | |
1353 | ||
1354 | static int | |
1355 | run_breakpoint_commands_z_type (char z_type, CORE_ADDR addr) | |
d3ce09f5 SS |
1356 | { |
1357 | /* Fetch registers for the current inferior. */ | |
802e8e6d | 1358 | struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
d3ce09f5 SS |
1359 | ULONGEST value = 0; |
1360 | struct point_command_list *cl; | |
1361 | int err = 0; | |
5ae4861a | 1362 | struct eval_agent_expr_context ctx; |
d3ce09f5 SS |
1363 | |
1364 | if (bp == NULL) | |
802e8e6d | 1365 | return 1; |
d3ce09f5 | 1366 | |
0bfdf32f | 1367 | ctx.regcache = get_thread_regcache (current_thread, 1); |
5ae4861a YQ |
1368 | ctx.tframe = NULL; |
1369 | ctx.tpoint = NULL; | |
1370 | ||
d3ce09f5 SS |
1371 | for (cl = bp->command_list; |
1372 | cl && !value && !err; cl = cl->next) | |
1373 | { | |
1374 | /* Run the command. */ | |
5ae4861a | 1375 | err = gdb_eval_agent_expr (&ctx, cl->cmd, &value); |
d3ce09f5 SS |
1376 | |
1377 | /* If one command has a problem, stop digging the hole deeper. */ | |
1378 | if (err) | |
802e8e6d | 1379 | return 0; |
d3ce09f5 | 1380 | } |
802e8e6d PA |
1381 | |
1382 | return 1; | |
d3ce09f5 SS |
1383 | } |
1384 | ||
802e8e6d PA |
1385 | void |
1386 | run_breakpoint_commands (CORE_ADDR where) | |
1387 | { | |
1388 | /* Only check code (software or hardware) breakpoints. If one | |
1389 | command has a problem, stop digging the hole deeper. */ | |
1390 | if (run_breakpoint_commands_z_type (Z_PACKET_SW_BP, where)) | |
1391 | run_breakpoint_commands_z_type (Z_PACKET_HW_BP, where); | |
1392 | } | |
1393 | ||
1394 | /* See mem-break.h. */ | |
9f3a5c85 LM |
1395 | |
1396 | int | |
1397 | gdb_breakpoint_here (CORE_ADDR where) | |
1398 | { | |
802e8e6d PA |
1399 | /* Only check code (software or hardware) breakpoints. */ |
1400 | return (find_gdb_breakpoint (Z_PACKET_SW_BP, where, -1) != NULL | |
1401 | || find_gdb_breakpoint (Z_PACKET_HW_BP, where, -1) != NULL); | |
68070c10 PA |
1402 | } |
1403 | ||
d50171e4 PA |
1404 | void |
1405 | set_reinsert_breakpoint (CORE_ADDR stop_at) | |
611cb4a5 | 1406 | { |
414a389f PA |
1407 | struct breakpoint *bp; |
1408 | ||
1409 | bp = set_breakpoint_at (stop_at, NULL); | |
414a389f | 1410 | bp->type = reinsert_breakpoint; |
611cb4a5 DJ |
1411 | } |
1412 | ||
1413 | void | |
d50171e4 | 1414 | delete_reinsert_breakpoints (void) |
611cb4a5 | 1415 | { |
d50171e4 PA |
1416 | struct process_info *proc = current_process (); |
1417 | struct breakpoint *bp, **bp_link; | |
611cb4a5 | 1418 | |
d50171e4 PA |
1419 | bp = proc->breakpoints; |
1420 | bp_link = &proc->breakpoints; | |
611cb4a5 | 1421 | |
d50171e4 PA |
1422 | while (bp) |
1423 | { | |
414a389f PA |
1424 | if (bp->type == reinsert_breakpoint) |
1425 | { | |
1426 | *bp_link = bp->next; | |
8b07ae33 | 1427 | release_breakpoint (proc, bp); |
414a389f PA |
1428 | bp = *bp_link; |
1429 | } | |
1430 | else | |
1431 | { | |
1432 | bp_link = &bp->next; | |
1433 | bp = *bp_link; | |
1434 | } | |
d50171e4 PA |
1435 | } |
1436 | } | |
b65d95c5 | 1437 | |
d50171e4 | 1438 | static void |
8b07ae33 | 1439 | uninsert_raw_breakpoint (struct raw_breakpoint *bp) |
d50171e4 | 1440 | { |
802e8e6d PA |
1441 | if (bp->inserted < 0) |
1442 | { | |
1443 | if (debug_threads) | |
1444 | debug_printf ("Breakpoint at %s is marked insert-disabled.\n", | |
1445 | paddress (bp->pc)); | |
1446 | } | |
1447 | else if (bp->inserted > 0) | |
d50171e4 PA |
1448 | { |
1449 | int err; | |
1450 | ||
1451 | bp->inserted = 0; | |
802e8e6d | 1452 | |
27165294 | 1453 | err = the_target->remove_point (bp->raw_type, bp->pc, bp->kind, bp); |
d50171e4 PA |
1454 | if (err != 0) |
1455 | { | |
1456 | bp->inserted = 1; | |
611cb4a5 | 1457 | |
d50171e4 | 1458 | if (debug_threads) |
802e8e6d PA |
1459 | debug_printf ("Failed to uninsert raw breakpoint at 0x%s.\n", |
1460 | paddress (bp->pc)); | |
d50171e4 PA |
1461 | } |
1462 | } | |
611cb4a5 DJ |
1463 | } |
1464 | ||
1465 | void | |
d50171e4 | 1466 | uninsert_breakpoints_at (CORE_ADDR pc) |
611cb4a5 | 1467 | { |
802e8e6d | 1468 | struct process_info *proc = current_process (); |
8b07ae33 | 1469 | struct raw_breakpoint *bp; |
802e8e6d | 1470 | int found = 0; |
611cb4a5 | 1471 | |
802e8e6d PA |
1472 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
1473 | if ((bp->raw_type == raw_bkpt_type_sw | |
1474 | || bp->raw_type == raw_bkpt_type_hw) | |
1475 | && bp->pc == pc) | |
1476 | { | |
1477 | found = 1; | |
1478 | ||
1479 | if (bp->inserted) | |
1480 | uninsert_raw_breakpoint (bp); | |
1481 | } | |
1482 | ||
1483 | if (!found) | |
d50171e4 PA |
1484 | { |
1485 | /* This can happen when we remove all breakpoints while handling | |
1486 | a step-over. */ | |
1487 | if (debug_threads) | |
87ce2a04 DE |
1488 | debug_printf ("Could not find breakpoint at 0x%s " |
1489 | "in list (uninserting).\n", | |
1490 | paddress (pc)); | |
d50171e4 | 1491 | } |
611cb4a5 DJ |
1492 | } |
1493 | ||
0fb4aa4b PA |
1494 | void |
1495 | uninsert_all_breakpoints (void) | |
1496 | { | |
1497 | struct process_info *proc = current_process (); | |
1498 | struct raw_breakpoint *bp; | |
1499 | ||
1500 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
802e8e6d PA |
1501 | if ((bp->raw_type == raw_bkpt_type_sw |
1502 | || bp->raw_type == raw_bkpt_type_hw) | |
1503 | && bp->inserted) | |
0fb4aa4b PA |
1504 | uninsert_raw_breakpoint (bp); |
1505 | } | |
1506 | ||
d50171e4 | 1507 | static void |
8b07ae33 | 1508 | reinsert_raw_breakpoint (struct raw_breakpoint *bp) |
611cb4a5 | 1509 | { |
d50171e4 | 1510 | int err; |
611cb4a5 | 1511 | |
d50171e4 | 1512 | if (bp->inserted) |
611cb4a5 DJ |
1513 | error ("Breakpoint already inserted at reinsert time."); |
1514 | ||
27165294 | 1515 | err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp); |
d50171e4 PA |
1516 | if (err == 0) |
1517 | bp->inserted = 1; | |
1518 | else if (debug_threads) | |
802e8e6d PA |
1519 | debug_printf ("Failed to reinsert breakpoint at 0x%s (%d).\n", |
1520 | paddress (bp->pc), err); | |
611cb4a5 DJ |
1521 | } |
1522 | ||
d50171e4 PA |
1523 | void |
1524 | reinsert_breakpoints_at (CORE_ADDR pc) | |
611cb4a5 | 1525 | { |
802e8e6d | 1526 | struct process_info *proc = current_process (); |
8b07ae33 | 1527 | struct raw_breakpoint *bp; |
802e8e6d | 1528 | int found = 0; |
611cb4a5 | 1529 | |
802e8e6d PA |
1530 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
1531 | if ((bp->raw_type == raw_bkpt_type_sw | |
1532 | || bp->raw_type == raw_bkpt_type_hw) | |
1533 | && bp->pc == pc) | |
1534 | { | |
1535 | found = 1; | |
1536 | ||
1537 | reinsert_raw_breakpoint (bp); | |
1538 | } | |
1539 | ||
1540 | if (!found) | |
611cb4a5 | 1541 | { |
d50171e4 PA |
1542 | /* This can happen when we remove all breakpoints while handling |
1543 | a step-over. */ | |
1544 | if (debug_threads) | |
87ce2a04 DE |
1545 | debug_printf ("Could not find raw breakpoint at 0x%s " |
1546 | "in list (reinserting).\n", | |
1547 | paddress (pc)); | |
611cb4a5 | 1548 | } |
d50171e4 PA |
1549 | } |
1550 | ||
0fb4aa4b PA |
1551 | void |
1552 | reinsert_all_breakpoints (void) | |
1553 | { | |
1554 | struct process_info *proc = current_process (); | |
1555 | struct raw_breakpoint *bp; | |
1556 | ||
1557 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
802e8e6d PA |
1558 | if ((bp->raw_type == raw_bkpt_type_sw |
1559 | || bp->raw_type == raw_bkpt_type_hw) | |
1560 | && !bp->inserted) | |
0fb4aa4b PA |
1561 | reinsert_raw_breakpoint (bp); |
1562 | } | |
1563 | ||
d50171e4 PA |
1564 | void |
1565 | check_breakpoints (CORE_ADDR stop_pc) | |
1566 | { | |
1567 | struct process_info *proc = current_process (); | |
1568 | struct breakpoint *bp, **bp_link; | |
1569 | ||
1570 | bp = proc->breakpoints; | |
1571 | bp_link = &proc->breakpoints; | |
1572 | ||
1573 | while (bp) | |
b65d95c5 | 1574 | { |
802e8e6d PA |
1575 | struct raw_breakpoint *raw = bp->raw; |
1576 | ||
1577 | if ((raw->raw_type == raw_bkpt_type_sw | |
1578 | || raw->raw_type == raw_bkpt_type_hw) | |
1579 | && raw->pc == stop_pc) | |
d50171e4 | 1580 | { |
802e8e6d | 1581 | if (!raw->inserted) |
d50171e4 PA |
1582 | { |
1583 | warning ("Hit a removed breakpoint?"); | |
1584 | return; | |
1585 | } | |
1586 | ||
1587 | if (bp->handler != NULL && (*bp->handler) (stop_pc)) | |
1588 | { | |
1589 | *bp_link = bp->next; | |
1590 | ||
8b07ae33 | 1591 | release_breakpoint (proc, bp); |
d50171e4 PA |
1592 | |
1593 | bp = *bp_link; | |
1594 | continue; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | bp_link = &bp->next; | |
1599 | bp = *bp_link; | |
b65d95c5 | 1600 | } |
611cb4a5 DJ |
1601 | } |
1602 | ||
d50171e4 PA |
1603 | int |
1604 | breakpoint_here (CORE_ADDR addr) | |
1605 | { | |
802e8e6d PA |
1606 | struct process_info *proc = current_process (); |
1607 | struct raw_breakpoint *bp; | |
1608 | ||
1609 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
1610 | if ((bp->raw_type == raw_bkpt_type_sw | |
1611 | || bp->raw_type == raw_bkpt_type_hw) | |
1612 | && bp->pc == addr) | |
1613 | return 1; | |
1614 | ||
1615 | return 0; | |
d50171e4 PA |
1616 | } |
1617 | ||
1618 | int | |
1619 | breakpoint_inserted_here (CORE_ADDR addr) | |
1620 | { | |
802e8e6d | 1621 | struct process_info *proc = current_process (); |
8b07ae33 | 1622 | struct raw_breakpoint *bp; |
d50171e4 | 1623 | |
802e8e6d PA |
1624 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
1625 | if ((bp->raw_type == raw_bkpt_type_sw | |
1626 | || bp->raw_type == raw_bkpt_type_hw) | |
1627 | && bp->pc == addr | |
1628 | && bp->inserted) | |
1629 | return 1; | |
d50171e4 | 1630 | |
802e8e6d | 1631 | return 0; |
d50171e4 PA |
1632 | } |
1633 | ||
582511be PA |
1634 | /* See mem-break.h. */ |
1635 | ||
1636 | int | |
1637 | software_breakpoint_inserted_here (CORE_ADDR addr) | |
1638 | { | |
1639 | struct process_info *proc = current_process (); | |
1640 | struct raw_breakpoint *bp; | |
1641 | ||
1642 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
1643 | if (bp->raw_type == raw_bkpt_type_sw | |
1644 | && bp->pc == addr | |
1645 | && bp->inserted) | |
1646 | return 1; | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /* See mem-break.h. */ | |
1652 | ||
1653 | int | |
1654 | hardware_breakpoint_inserted_here (CORE_ADDR addr) | |
1655 | { | |
1656 | struct process_info *proc = current_process (); | |
1657 | struct raw_breakpoint *bp; | |
1658 | ||
1659 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) | |
1660 | if (bp->raw_type == raw_bkpt_type_hw | |
1661 | && bp->pc == addr | |
1662 | && bp->inserted) | |
1663 | return 1; | |
1664 | ||
1665 | return 0; | |
1666 | } | |
1667 | ||
d3bbe7a0 PA |
1668 | static int |
1669 | validate_inserted_breakpoint (struct raw_breakpoint *bp) | |
1670 | { | |
1671 | unsigned char *buf; | |
1672 | int err; | |
1673 | ||
1674 | gdb_assert (bp->inserted); | |
802e8e6d | 1675 | gdb_assert (bp->raw_type == raw_bkpt_type_sw); |
d3bbe7a0 | 1676 | |
27165294 AT |
1677 | buf = (unsigned char *) alloca (bp_size (bp)); |
1678 | err = (*the_target->read_memory) (bp->pc, buf, bp_size (bp)); | |
1679 | if (err || memcmp (buf, bp_opcode (bp), bp_size (bp)) != 0) | |
d3bbe7a0 PA |
1680 | { |
1681 | /* Tag it as gone. */ | |
802e8e6d | 1682 | bp->inserted = -1; |
d3bbe7a0 PA |
1683 | return 0; |
1684 | } | |
1685 | ||
1686 | return 1; | |
1687 | } | |
1688 | ||
1689 | static void | |
1690 | delete_disabled_breakpoints (void) | |
1691 | { | |
1692 | struct process_info *proc = current_process (); | |
1693 | struct breakpoint *bp, *next; | |
1694 | ||
1695 | for (bp = proc->breakpoints; bp != NULL; bp = next) | |
1696 | { | |
1697 | next = bp->next; | |
802e8e6d | 1698 | if (bp->raw->inserted < 0) |
d3bbe7a0 PA |
1699 | delete_breakpoint_1 (proc, bp); |
1700 | } | |
1701 | } | |
1702 | ||
1703 | /* Check if breakpoints we inserted still appear to be inserted. They | |
1704 | may disappear due to a shared library unload, and worse, a new | |
1705 | shared library may be reloaded at the same address as the | |
1706 | previously unloaded one. If that happens, we should make sure that | |
1707 | the shadow memory of the old breakpoints isn't used when reading or | |
1708 | writing memory. */ | |
1709 | ||
1710 | void | |
1711 | validate_breakpoints (void) | |
1712 | { | |
1713 | struct process_info *proc = current_process (); | |
1714 | struct breakpoint *bp; | |
1715 | ||
1716 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) | |
1717 | { | |
802e8e6d PA |
1718 | struct raw_breakpoint *raw = bp->raw; |
1719 | ||
1720 | if (raw->raw_type == raw_bkpt_type_sw && raw->inserted > 0) | |
1721 | validate_inserted_breakpoint (raw); | |
d3bbe7a0 PA |
1722 | } |
1723 | ||
1724 | delete_disabled_breakpoints (); | |
1725 | } | |
1726 | ||
611cb4a5 | 1727 | void |
f450004a | 1728 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
611cb4a5 | 1729 | { |
95954743 | 1730 | struct process_info *proc = current_process (); |
8b07ae33 | 1731 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
fa593d66 | 1732 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
611cb4a5 | 1733 | CORE_ADDR mem_end = mem_addr + mem_len; |
d3bbe7a0 | 1734 | int disabled_one = 0; |
611cb4a5 | 1735 | |
fa593d66 PA |
1736 | for (; jp != NULL; jp = jp->next) |
1737 | { | |
1738 | CORE_ADDR bp_end = jp->pc + jp->length; | |
1739 | CORE_ADDR start, end; | |
1740 | int copy_offset, copy_len, buf_offset; | |
1741 | ||
6bf36717 JK |
1742 | gdb_assert (fast_tracepoint_jump_shadow (jp) >= buf + mem_len |
1743 | || buf >= fast_tracepoint_jump_shadow (jp) + (jp)->length); | |
1744 | ||
fa593d66 PA |
1745 | if (mem_addr >= bp_end) |
1746 | continue; | |
1747 | if (jp->pc >= mem_end) | |
1748 | continue; | |
1749 | ||
1750 | start = jp->pc; | |
1751 | if (mem_addr > start) | |
1752 | start = mem_addr; | |
1753 | ||
1754 | end = bp_end; | |
1755 | if (end > mem_end) | |
1756 | end = mem_end; | |
1757 | ||
1758 | copy_len = end - start; | |
1759 | copy_offset = start - jp->pc; | |
1760 | buf_offset = start - mem_addr; | |
1761 | ||
1762 | if (jp->inserted) | |
1763 | memcpy (buf + buf_offset, | |
1764 | fast_tracepoint_jump_shadow (jp) + copy_offset, | |
1765 | copy_len); | |
1766 | } | |
1767 | ||
611cb4a5 DJ |
1768 | for (; bp != NULL; bp = bp->next) |
1769 | { | |
27165294 | 1770 | CORE_ADDR bp_end = bp->pc + bp_size (bp); |
611cb4a5 DJ |
1771 | CORE_ADDR start, end; |
1772 | int copy_offset, copy_len, buf_offset; | |
1773 | ||
802e8e6d PA |
1774 | if (bp->raw_type != raw_bkpt_type_sw) |
1775 | continue; | |
1776 | ||
6bf36717 JK |
1777 | gdb_assert (bp->old_data >= buf + mem_len |
1778 | || buf >= &bp->old_data[sizeof (bp->old_data)]); | |
1779 | ||
611cb4a5 DJ |
1780 | if (mem_addr >= bp_end) |
1781 | continue; | |
1782 | if (bp->pc >= mem_end) | |
1783 | continue; | |
1784 | ||
1785 | start = bp->pc; | |
1786 | if (mem_addr > start) | |
1787 | start = mem_addr; | |
1788 | ||
1789 | end = bp_end; | |
1790 | if (end > mem_end) | |
1791 | end = mem_end; | |
1792 | ||
1793 | copy_len = end - start; | |
1794 | copy_offset = start - bp->pc; | |
1795 | buf_offset = start - mem_addr; | |
1796 | ||
802e8e6d | 1797 | if (bp->inserted > 0) |
d3bbe7a0 PA |
1798 | { |
1799 | if (validate_inserted_breakpoint (bp)) | |
1800 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); | |
1801 | else | |
1802 | disabled_one = 1; | |
1803 | } | |
611cb4a5 | 1804 | } |
d3bbe7a0 PA |
1805 | |
1806 | if (disabled_one) | |
1807 | delete_disabled_breakpoints (); | |
611cb4a5 DJ |
1808 | } |
1809 | ||
1810 | void | |
b9fd1791 PA |
1811 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, |
1812 | const unsigned char *myaddr, int mem_len) | |
611cb4a5 | 1813 | { |
95954743 | 1814 | struct process_info *proc = current_process (); |
8b07ae33 | 1815 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
fa593d66 | 1816 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
611cb4a5 | 1817 | CORE_ADDR mem_end = mem_addr + mem_len; |
d3bbe7a0 | 1818 | int disabled_one = 0; |
611cb4a5 | 1819 | |
fa593d66 PA |
1820 | /* First fast tracepoint jumps, then breakpoint traps on top. */ |
1821 | ||
1822 | for (; jp != NULL; jp = jp->next) | |
1823 | { | |
1824 | CORE_ADDR jp_end = jp->pc + jp->length; | |
1825 | CORE_ADDR start, end; | |
1826 | int copy_offset, copy_len, buf_offset; | |
1827 | ||
6bf36717 JK |
1828 | gdb_assert (fast_tracepoint_jump_shadow (jp) >= myaddr + mem_len |
1829 | || myaddr >= fast_tracepoint_jump_shadow (jp) + (jp)->length); | |
1830 | gdb_assert (fast_tracepoint_jump_insn (jp) >= buf + mem_len | |
1831 | || buf >= fast_tracepoint_jump_insn (jp) + (jp)->length); | |
1832 | ||
fa593d66 PA |
1833 | if (mem_addr >= jp_end) |
1834 | continue; | |
1835 | if (jp->pc >= mem_end) | |
1836 | continue; | |
1837 | ||
1838 | start = jp->pc; | |
1839 | if (mem_addr > start) | |
1840 | start = mem_addr; | |
1841 | ||
1842 | end = jp_end; | |
1843 | if (end > mem_end) | |
1844 | end = mem_end; | |
1845 | ||
1846 | copy_len = end - start; | |
1847 | copy_offset = start - jp->pc; | |
1848 | buf_offset = start - mem_addr; | |
1849 | ||
1850 | memcpy (fast_tracepoint_jump_shadow (jp) + copy_offset, | |
b9fd1791 | 1851 | myaddr + buf_offset, copy_len); |
fa593d66 PA |
1852 | if (jp->inserted) |
1853 | memcpy (buf + buf_offset, | |
1854 | fast_tracepoint_jump_insn (jp) + copy_offset, copy_len); | |
1855 | } | |
1856 | ||
611cb4a5 DJ |
1857 | for (; bp != NULL; bp = bp->next) |
1858 | { | |
27165294 | 1859 | CORE_ADDR bp_end = bp->pc + bp_size (bp); |
611cb4a5 DJ |
1860 | CORE_ADDR start, end; |
1861 | int copy_offset, copy_len, buf_offset; | |
1862 | ||
802e8e6d PA |
1863 | if (bp->raw_type != raw_bkpt_type_sw) |
1864 | continue; | |
1865 | ||
6bf36717 JK |
1866 | gdb_assert (bp->old_data >= myaddr + mem_len |
1867 | || myaddr >= &bp->old_data[sizeof (bp->old_data)]); | |
1868 | ||
611cb4a5 DJ |
1869 | if (mem_addr >= bp_end) |
1870 | continue; | |
1871 | if (bp->pc >= mem_end) | |
1872 | continue; | |
1873 | ||
1874 | start = bp->pc; | |
1875 | if (mem_addr > start) | |
1876 | start = mem_addr; | |
1877 | ||
1878 | end = bp_end; | |
1879 | if (end > mem_end) | |
1880 | end = mem_end; | |
1881 | ||
1882 | copy_len = end - start; | |
1883 | copy_offset = start - bp->pc; | |
1884 | buf_offset = start - mem_addr; | |
1885 | ||
b9fd1791 | 1886 | memcpy (bp->old_data + copy_offset, myaddr + buf_offset, copy_len); |
802e8e6d | 1887 | if (bp->inserted > 0) |
d3bbe7a0 PA |
1888 | { |
1889 | if (validate_inserted_breakpoint (bp)) | |
27165294 | 1890 | memcpy (buf + buf_offset, bp_opcode (bp) + copy_offset, copy_len); |
d3bbe7a0 PA |
1891 | else |
1892 | disabled_one = 1; | |
1893 | } | |
611cb4a5 | 1894 | } |
d3bbe7a0 PA |
1895 | |
1896 | if (disabled_one) | |
1897 | delete_disabled_breakpoints (); | |
611cb4a5 | 1898 | } |
ae13219e | 1899 | |
95954743 | 1900 | /* Delete all breakpoints, and un-insert them from the inferior. */ |
ae13219e DJ |
1901 | |
1902 | void | |
1903 | delete_all_breakpoints (void) | |
1904 | { | |
95954743 PA |
1905 | struct process_info *proc = current_process (); |
1906 | ||
1907 | while (proc->breakpoints) | |
8b07ae33 | 1908 | delete_breakpoint_1 (proc, proc->breakpoints); |
95954743 PA |
1909 | } |
1910 | ||
f9e39928 | 1911 | /* Clear the "inserted" flag in all breakpoints. */ |
95954743 PA |
1912 | |
1913 | void | |
f9e39928 | 1914 | mark_breakpoints_out (struct process_info *proc) |
95954743 | 1915 | { |
8b07ae33 | 1916 | struct raw_breakpoint *raw_bp; |
95954743 | 1917 | |
8b07ae33 PA |
1918 | for (raw_bp = proc->raw_breakpoints; raw_bp != NULL; raw_bp = raw_bp->next) |
1919 | raw_bp->inserted = 0; | |
f9e39928 PA |
1920 | } |
1921 | ||
1922 | /* Release all breakpoints, but do not try to un-insert them from the | |
1923 | inferior. */ | |
1924 | ||
1925 | void | |
1926 | free_all_breakpoints (struct process_info *proc) | |
1927 | { | |
1928 | mark_breakpoints_out (proc); | |
8b07ae33 PA |
1929 | |
1930 | /* Note: use PROC explicitly instead of deferring to | |
1931 | delete_all_breakpoints --- CURRENT_INFERIOR may already have been | |
1932 | released when we get here. There should be no call to | |
1933 | current_process from here on. */ | |
95954743 | 1934 | while (proc->breakpoints) |
8b07ae33 | 1935 | delete_breakpoint_1 (proc, proc->breakpoints); |
ae13219e | 1936 | } |
ddcbc397 DB |
1937 | |
1938 | /* Clone an agent expression. */ | |
1939 | ||
1940 | static struct agent_expr * | |
1941 | clone_agent_expr (const struct agent_expr *src_ax) | |
1942 | { | |
1943 | struct agent_expr *ax; | |
1944 | ||
8d749320 | 1945 | ax = XCNEW (struct agent_expr); |
ddcbc397 | 1946 | ax->length = src_ax->length; |
224c3ddb | 1947 | ax->bytes = (unsigned char *) xcalloc (ax->length, 1); |
ddcbc397 DB |
1948 | memcpy (ax->bytes, src_ax->bytes, ax->length); |
1949 | return ax; | |
1950 | } | |
1951 | ||
1952 | /* Deep-copy the contents of one breakpoint to another. */ | |
1953 | ||
1954 | static struct breakpoint * | |
1955 | clone_one_breakpoint (const struct breakpoint *src) | |
1956 | { | |
1957 | struct breakpoint *dest; | |
1958 | struct raw_breakpoint *dest_raw; | |
1959 | struct point_cond_list *current_cond; | |
1960 | struct point_cond_list *new_cond; | |
1961 | struct point_cond_list *cond_tail = NULL; | |
1962 | struct point_command_list *current_cmd; | |
1963 | struct point_command_list *new_cmd; | |
1964 | struct point_command_list *cmd_tail = NULL; | |
1965 | ||
1966 | /* Clone the raw breakpoint. */ | |
8d749320 | 1967 | dest_raw = XCNEW (struct raw_breakpoint); |
ddcbc397 DB |
1968 | dest_raw->raw_type = src->raw->raw_type; |
1969 | dest_raw->refcount = src->raw->refcount; | |
1970 | dest_raw->pc = src->raw->pc; | |
27165294 | 1971 | dest_raw->kind = src->raw->kind; |
ddcbc397 DB |
1972 | memcpy (dest_raw->old_data, src->raw->old_data, MAX_BREAKPOINT_LEN); |
1973 | dest_raw->inserted = src->raw->inserted; | |
1974 | ||
1975 | /* Clone the high-level breakpoint. */ | |
8d749320 | 1976 | dest = XCNEW (struct breakpoint); |
ddcbc397 DB |
1977 | dest->type = src->type; |
1978 | dest->raw = dest_raw; | |
1979 | dest->handler = src->handler; | |
1980 | ||
1981 | /* Clone the condition list. */ | |
1982 | for (current_cond = src->cond_list; current_cond != NULL; | |
1983 | current_cond = current_cond->next) | |
1984 | { | |
8d749320 | 1985 | new_cond = XCNEW (struct point_cond_list); |
ddcbc397 DB |
1986 | new_cond->cond = clone_agent_expr (current_cond->cond); |
1987 | APPEND_TO_LIST (&dest->cond_list, new_cond, cond_tail); | |
1988 | } | |
1989 | ||
1990 | /* Clone the command list. */ | |
1991 | for (current_cmd = src->command_list; current_cmd != NULL; | |
1992 | current_cmd = current_cmd->next) | |
1993 | { | |
8d749320 | 1994 | new_cmd = XCNEW (struct point_command_list); |
ddcbc397 DB |
1995 | new_cmd->cmd = clone_agent_expr (current_cmd->cmd); |
1996 | new_cmd->persistence = current_cmd->persistence; | |
1997 | APPEND_TO_LIST (&dest->command_list, new_cmd, cmd_tail); | |
1998 | } | |
1999 | ||
2000 | return dest; | |
2001 | } | |
2002 | ||
2003 | /* Create a new breakpoint list NEW_LIST that is a copy of the | |
2004 | list starting at SRC_LIST. Create the corresponding new | |
2005 | raw_breakpoint list NEW_RAW_LIST as well. */ | |
2006 | ||
2007 | void | |
2008 | clone_all_breakpoints (struct breakpoint **new_list, | |
2009 | struct raw_breakpoint **new_raw_list, | |
2010 | const struct breakpoint *src_list) | |
2011 | { | |
2012 | const struct breakpoint *bp; | |
2013 | struct breakpoint *new_bkpt; | |
2014 | struct breakpoint *bkpt_tail = NULL; | |
2015 | struct raw_breakpoint *raw_bkpt_tail = NULL; | |
2016 | ||
2017 | for (bp = src_list; bp != NULL; bp = bp->next) | |
2018 | { | |
2019 | new_bkpt = clone_one_breakpoint (bp); | |
2020 | APPEND_TO_LIST (new_list, new_bkpt, bkpt_tail); | |
2021 | APPEND_TO_LIST (new_raw_list, new_bkpt->raw, raw_bkpt_tail); | |
2022 | } | |
2023 | } |